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-rw-r--r--js/src/debugger/Debugger.cpp7114
1 files changed, 7114 insertions, 0 deletions
diff --git a/js/src/debugger/Debugger.cpp b/js/src/debugger/Debugger.cpp
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+++ b/js/src/debugger/Debugger.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "debugger/Debugger-inl.h"
+
+#include "mozilla/Attributes.h" // for MOZ_STACK_CLASS, MOZ_RAII
+#include "mozilla/DebugOnly.h" // for DebugOnly
+#include "mozilla/DoublyLinkedList.h" // for DoublyLinkedList<>::Iterator
+#include "mozilla/HashTable.h" // for HashSet<>::Range, HashMapEntry
+#include "mozilla/Maybe.h" // for Maybe, Nothing, Some
+#include "mozilla/ScopeExit.h" // for MakeScopeExit, ScopeExit
+#include "mozilla/ThreadLocal.h" // for ThreadLocal
+#include "mozilla/TimeStamp.h" // for TimeStamp, TimeDuration
+#include "mozilla/UniquePtr.h" // for UniquePtr
+#include "mozilla/Variant.h" // for AsVariant, AsVariantTemporary
+#include "mozilla/Vector.h" // for Vector, Vector<>::ConstRange
+
+#include <algorithm> // for std::find, std::max
+#include <functional> // for function
+#include <stddef.h> // for size_t
+#include <stdint.h> // for uint32_t, uint64_t, int32_t
+#include <string.h> // for strlen, strcmp
+#include <type_traits> // for std::underlying_type_t
+#include <utility> // for std::move
+
+#include "jsapi.h" // for CallArgs, CallArgsFromVp
+#include "jstypes.h" // for JS_PUBLIC_API
+
+#include "builtin/Array.h" // for NewDenseFullyAllocatedArray
+#include "debugger/DebugAPI.h" // for ResumeMode, DebugAPI
+#include "debugger/DebuggerMemory.h" // for DebuggerMemory
+#include "debugger/DebugScript.h" // for DebugScript
+#include "debugger/Environment.h" // for DebuggerEnvironment
+#include "debugger/Frame.h" // for DebuggerFrame
+#include "debugger/NoExecute.h" // for EnterDebuggeeNoExecute
+#include "debugger/Object.h" // for DebuggerObject
+#include "debugger/Script.h" // for DebuggerScript
+#include "debugger/Source.h" // for DebuggerSource
+#include "frontend/BytecodeCompiler.h" // for IsIdentifier
+#include "frontend/CompilationStencil.h" // for CompilationStencil
+#include "frontend/FrontendContext.h" // for AutoReportFrontendContext
+#include "frontend/Parser.h" // for Parser
+#include "gc/GC.h" // for IterateScripts
+#include "gc/GCContext.h" // for JS::GCContext
+#include "gc/GCMarker.h" // for GCMarker
+#include "gc/GCRuntime.h" // for GCRuntime, AutoEnterIteration
+#include "gc/HashUtil.h" // for DependentAddPtr
+#include "gc/Marking.h" // for IsAboutToBeFinalized
+#include "gc/PublicIterators.h" // for RealmsIter, CompartmentsIter
+#include "gc/Statistics.h" // for Statistics::SliceData
+#include "gc/Tracer.h" // for TraceEdge
+#include "gc/Zone.h" // for Zone
+#include "gc/ZoneAllocator.h" // for ZoneAllocPolicy
+#include "jit/BaselineDebugModeOSR.h" // for RecompileOnStackBaselineScriptsForDebugMode
+#include "jit/BaselineJIT.h" // for FinishDiscardBaselineScript
+#include "jit/Invalidation.h" // for RecompileInfoVector
+#include "jit/JitContext.h" // for JitContext
+#include "jit/JitOptions.h" // for fuzzingSafe
+#include "jit/JitScript.h" // for JitScript
+#include "jit/JSJitFrameIter.h" // for InlineFrameIterator
+#include "jit/RematerializedFrame.h" // for RematerializedFrame
+#include "js/CallAndConstruct.h" // JS::IsCallable
+#include "js/Conversions.h" // for ToBoolean, ToUint32
+#include "js/Debug.h" // for Builder::Object, Builder
+#include "js/friend/ErrorMessages.h" // for GetErrorMessage, JSMSG_*
+#include "js/GCAPI.h" // for GarbageCollectionEvent
+#include "js/GCVariant.h" // for GCVariant
+#include "js/HeapAPI.h" // for ExposeObjectToActiveJS
+#include "js/Promise.h" // for AutoDebuggerJobQueueInterruption
+#include "js/PropertyAndElement.h" // for JS_GetProperty
+#include "js/Proxy.h" // for PropertyDescriptor
+#include "js/SourceText.h" // for SourceOwnership, SourceText
+#include "js/StableStringChars.h" // for AutoStableStringChars
+#include "js/UbiNode.h" // for Node, RootList, Edge
+#include "js/UbiNodeBreadthFirst.h" // for BreadthFirst
+#include "js/Wrapper.h" // for CheckedUnwrapStatic
+#include "util/Text.h" // for DuplicateString, js_strlen
+#include "vm/ArrayObject.h" // for ArrayObject
+#include "vm/AsyncFunction.h" // for AsyncFunctionGeneratorObject
+#include "vm/AsyncIteration.h" // for AsyncGeneratorObject
+#include "vm/BytecodeUtil.h" // for JSDVG_IGNORE_STACK
+#include "vm/Compartment.h" // for CrossCompartmentKey
+#include "vm/EnvironmentObject.h" // for IsSyntacticEnvironment
+#include "vm/ErrorReporting.h" // for ReportErrorToGlobal
+#include "vm/GeneratorObject.h" // for AbstractGeneratorObject
+#include "vm/GlobalObject.h" // for GlobalObject
+#include "vm/Interpreter.h" // for Call, ReportIsNotFunction
+#include "vm/Iteration.h" // for CreateIterResultObject
+#include "vm/JSAtom.h" // for Atomize, ClassName
+#include "vm/JSContext.h" // for JSContext
+#include "vm/JSFunction.h" // for JSFunction
+#include "vm/JSObject.h" // for JSObject, RequireObject,
+#include "vm/JSScript.h" // for BaseScript, ScriptSourceObject
+#include "vm/ObjectOperations.h" // for DefineDataProperty
+#include "vm/PlainObject.h" // for js::PlainObject
+#include "vm/PromiseObject.h" // for js::PromiseObject
+#include "vm/ProxyObject.h" // for ProxyObject, JSObject::is
+#include "vm/Realm.h" // for AutoRealm, Realm
+#include "vm/Runtime.h" // for ReportOutOfMemory, JSRuntime
+#include "vm/SavedFrame.h" // for SavedFrame
+#include "vm/SavedStacks.h" // for SavedStacks
+#include "vm/Scope.h" // for Scope
+#include "vm/StringType.h" // for JSString, PropertyName
+#include "vm/WrapperObject.h" // for CrossCompartmentWrapperObject
+#include "wasm/WasmDebug.h" // for DebugState
+#include "wasm/WasmInstance.h" // for Instance
+#include "wasm/WasmJS.h" // for WasmInstanceObject
+#include "wasm/WasmRealm.h" // for Realm
+#include "wasm/WasmTypeDecls.h" // for WasmInstanceObjectVector
+
+#include "debugger/DebugAPI-inl.h"
+#include "debugger/Environment-inl.h" // for DebuggerEnvironment::owner
+#include "debugger/Frame-inl.h" // for DebuggerFrame::hasGeneratorInfo
+#include "debugger/Object-inl.h" // for DebuggerObject::owner and isInstance.
+#include "debugger/Script-inl.h" // for DebuggerScript::getReferent
+#include "gc/GC-inl.h" // for ZoneCellIter
+#include "gc/Marking-inl.h" // for MaybeForwarded
+#include "gc/StableCellHasher-inl.h"
+#include "gc/WeakMap-inl.h" // for DebuggerWeakMap::trace
+#include "vm/Compartment-inl.h" // for Compartment::wrap
+#include "vm/GeckoProfiler-inl.h" // for AutoSuppressProfilerSampling
+#include "vm/JSAtom-inl.h" // for AtomToId, ValueToId
+#include "vm/JSContext-inl.h" // for JSContext::check
+#include "vm/JSObject-inl.h" // for JSObject::isCallable, NewTenuredObjectWithGivenProto
+#include "vm/JSScript-inl.h" // for JSScript::isDebuggee, JSScript
+#include "vm/NativeObject-inl.h" // for NativeObject::ensureDenseInitializedLength
+#include "vm/ObjectOperations-inl.h" // for GetProperty, HasProperty
+#include "vm/Realm-inl.h" // for AutoRealm::AutoRealm
+#include "vm/Stack-inl.h" // for AbstractFramePtr::script
+
+namespace js {
+
+namespace frontend {
+class FullParseHandler;
+}
+
+namespace gc {
+struct Cell;
+}
+
+namespace jit {
+class BaselineFrame;
+}
+
+} /* namespace js */
+
+using namespace js;
+
+using JS::AutoStableStringChars;
+using JS::CompileOptions;
+using JS::SourceOwnership;
+using JS::SourceText;
+using JS::dbg::AutoEntryMonitor;
+using JS::dbg::Builder;
+using js::frontend::IsIdentifier;
+using mozilla::AsVariant;
+using mozilla::DebugOnly;
+using mozilla::MakeScopeExit;
+using mozilla::Maybe;
+using mozilla::Nothing;
+using mozilla::Some;
+using mozilla::TimeDuration;
+using mozilla::TimeStamp;
+
+/*** Utils ******************************************************************/
+
+bool js::IsInterpretedNonSelfHostedFunction(JSFunction* fun) {
+ return fun->isInterpreted() && !fun->isSelfHostedBuiltin();
+}
+
+JSScript* js::GetOrCreateFunctionScript(JSContext* cx, HandleFunction fun) {
+ MOZ_ASSERT(IsInterpretedNonSelfHostedFunction(fun));
+ AutoRealm ar(cx, fun);
+ return JSFunction::getOrCreateScript(cx, fun);
+}
+
+ArrayObject* js::GetFunctionParameterNamesArray(JSContext* cx,
+ HandleFunction fun) {
+ RootedValueVector names(cx);
+
+ // The default value for each argument is |undefined|.
+ if (!names.growBy(fun->nargs())) {
+ return nullptr;
+ }
+
+ if (IsInterpretedNonSelfHostedFunction(fun) && fun->nargs() > 0) {
+ RootedScript script(cx, GetOrCreateFunctionScript(cx, fun));
+ if (!script) {
+ return nullptr;
+ }
+
+ MOZ_ASSERT(fun->nargs() == script->numArgs());
+
+ PositionalFormalParameterIter fi(script);
+ for (size_t i = 0; i < fun->nargs(); i++, fi++) {
+ MOZ_ASSERT(fi.argumentSlot() == i);
+ if (JSAtom* atom = fi.name()) {
+ // Skip any internal, non-identifier names, like for example ".args".
+ if (IsIdentifier(atom)) {
+ cx->markAtom(atom);
+ names[i].setString(atom);
+ }
+ }
+ }
+ }
+
+ return NewDenseCopiedArray(cx, names.length(), names.begin());
+}
+
+bool js::ValueToIdentifier(JSContext* cx, HandleValue v, MutableHandleId id) {
+ if (!ToPropertyKey(cx, v, id)) {
+ return false;
+ }
+ if (!id.isAtom() || !IsIdentifier(id.toAtom())) {
+ RootedValue val(cx, v);
+ ReportValueError(cx, JSMSG_UNEXPECTED_TYPE, JSDVG_SEARCH_STACK, val,
+ nullptr, "not an identifier");
+ return false;
+ }
+ return true;
+}
+
+class js::AutoRestoreRealmDebugMode {
+ Realm* realm_;
+ unsigned bits_;
+
+ public:
+ explicit AutoRestoreRealmDebugMode(Realm* realm)
+ : realm_(realm), bits_(realm->debugModeBits_) {
+ MOZ_ASSERT(realm_);
+ }
+
+ ~AutoRestoreRealmDebugMode() {
+ if (realm_) {
+ realm_->debugModeBits_ = bits_;
+ }
+ }
+
+ void release() { realm_ = nullptr; }
+};
+
+/* static */
+bool DebugAPI::slowPathCheckNoExecute(JSContext* cx, HandleScript script) {
+ MOZ_ASSERT(cx->realm()->isDebuggee());
+ MOZ_ASSERT(cx->noExecuteDebuggerTop);
+ return EnterDebuggeeNoExecute::reportIfFoundInStack(cx, script);
+}
+
+static void PropagateForcedReturn(JSContext* cx, AbstractFramePtr frame,
+ HandleValue rval) {
+ // The Debugger's hooks may return a value that affects the completion
+ // value of the given frame. For example, a hook may return `{ return: 42 }`
+ // to terminate the frame and return `42` as the final frame result.
+ // To accomplish this, the debugger treats these return values as if
+ // execution of the JS function has been terminated without a pending
+ // exception, but with a special flag. When the error is handled by the
+ // interpreter or JIT, the special flag and the error state will be cleared
+ // and execution will continue from the end of the frame.
+ MOZ_ASSERT(!cx->isExceptionPending());
+ cx->setPropagatingForcedReturn();
+ frame.setReturnValue(rval);
+}
+
+[[nodiscard]] static bool AdjustGeneratorResumptionValue(JSContext* cx,
+ AbstractFramePtr frame,
+ ResumeMode& resumeMode,
+ MutableHandleValue vp);
+
+[[nodiscard]] static bool ApplyFrameResumeMode(JSContext* cx,
+ AbstractFramePtr frame,
+ ResumeMode resumeMode,
+ HandleValue rv,
+ Handle<SavedFrame*> exnStack) {
+ RootedValue rval(cx, rv);
+
+ // The value passed in here is unwrapped and has no guarantees about what
+ // compartment it may be associated with, so we explicitly wrap it into the
+ // debuggee compartment.
+ if (!cx->compartment()->wrap(cx, &rval)) {
+ return false;
+ }
+
+ if (!AdjustGeneratorResumptionValue(cx, frame, resumeMode, &rval)) {
+ return false;
+ }
+
+ switch (resumeMode) {
+ case ResumeMode::Continue:
+ break;
+
+ case ResumeMode::Throw:
+ // If we have a stack from the original throw, use it instead of
+ // associating the throw with the current execution point.
+ if (exnStack) {
+ cx->setPendingException(rval, exnStack);
+ } else {
+ cx->setPendingException(rval, ShouldCaptureStack::Always);
+ }
+ return false;
+
+ case ResumeMode::Terminate:
+ cx->clearPendingException();
+ return false;
+
+ case ResumeMode::Return:
+ PropagateForcedReturn(cx, frame, rval);
+ return false;
+
+ default:
+ MOZ_CRASH("bad Debugger::onEnterFrame resume mode");
+ }
+
+ return true;
+}
+static bool ApplyFrameResumeMode(JSContext* cx, AbstractFramePtr frame,
+ ResumeMode resumeMode, HandleValue rval) {
+ Rooted<SavedFrame*> nullStack(cx);
+ return ApplyFrameResumeMode(cx, frame, resumeMode, rval, nullStack);
+}
+
+bool js::ValueToStableChars(JSContext* cx, const char* fnname,
+ HandleValue value,
+ AutoStableStringChars& stableChars) {
+ if (!value.isString()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_NOT_EXPECTED_TYPE, fnname, "string",
+ InformalValueTypeName(value));
+ return false;
+ }
+ Rooted<JSLinearString*> linear(cx, value.toString()->ensureLinear(cx));
+ if (!linear) {
+ return false;
+ }
+ if (!stableChars.initTwoByte(cx, linear)) {
+ return false;
+ }
+ return true;
+}
+
+bool EvalOptions::setFilename(JSContext* cx, const char* filename) {
+ JS::UniqueChars copy;
+ if (filename) {
+ copy = DuplicateString(cx, filename);
+ if (!copy) {
+ return false;
+ }
+ }
+
+ filename_ = std::move(copy);
+ return true;
+}
+
+bool js::ParseEvalOptions(JSContext* cx, HandleValue value,
+ EvalOptions& options) {
+ if (!value.isObject()) {
+ return true;
+ }
+
+ RootedObject opts(cx, &value.toObject());
+
+ RootedValue v(cx);
+ if (!JS_GetProperty(cx, opts, "url", &v)) {
+ return false;
+ }
+ if (!v.isUndefined()) {
+ RootedString url_str(cx, ToString<CanGC>(cx, v));
+ if (!url_str) {
+ return false;
+ }
+ UniqueChars url_bytes = JS_EncodeStringToUTF8(cx, url_str);
+ if (!url_bytes) {
+ return false;
+ }
+ if (!options.setFilename(cx, url_bytes.get())) {
+ return false;
+ }
+ }
+
+ if (!JS_GetProperty(cx, opts, "lineNumber", &v)) {
+ return false;
+ }
+ if (!v.isUndefined()) {
+ uint32_t lineno;
+ if (!ToUint32(cx, v, &lineno)) {
+ return false;
+ }
+ options.setLineno(lineno);
+ }
+
+ if (!JS_GetProperty(cx, opts, "hideFromDebugger", &v)) {
+ return false;
+ }
+ options.setHideFromDebugger(ToBoolean(v));
+
+ return true;
+}
+
+/*** Breakpoints ************************************************************/
+
+bool BreakpointSite::isEmpty() const { return breakpoints.isEmpty(); }
+
+void BreakpointSite::trace(JSTracer* trc) {
+ for (auto p = breakpoints.begin(); p; p++) {
+ p->trace(trc);
+ }
+}
+
+void BreakpointSite::finalize(JS::GCContext* gcx) {
+ while (!breakpoints.isEmpty()) {
+ breakpoints.begin()->delete_(gcx);
+ }
+}
+
+Breakpoint* BreakpointSite::firstBreakpoint() const {
+ if (isEmpty()) {
+ return nullptr;
+ }
+ return &(*breakpoints.begin());
+}
+
+bool BreakpointSite::hasBreakpoint(Breakpoint* toFind) {
+ const BreakpointList::Iterator bp(toFind);
+ for (auto p = breakpoints.begin(); p; p++) {
+ if (p == bp) {
+ return true;
+ }
+ }
+ return false;
+}
+
+Breakpoint::Breakpoint(Debugger* debugger, HandleObject wrappedDebugger,
+ BreakpointSite* site, HandleObject handler)
+ : debugger(debugger),
+ wrappedDebugger(wrappedDebugger),
+ site(site),
+ handler(handler) {
+ MOZ_ASSERT(UncheckedUnwrap(wrappedDebugger) == debugger->object);
+ MOZ_ASSERT(handler->compartment() == wrappedDebugger->compartment());
+
+ debugger->breakpoints.pushBack(this);
+ site->breakpoints.pushBack(this);
+}
+
+void Breakpoint::trace(JSTracer* trc) {
+ TraceEdge(trc, &wrappedDebugger, "breakpoint owner");
+ TraceEdge(trc, &handler, "breakpoint handler");
+}
+
+void Breakpoint::delete_(JS::GCContext* gcx) {
+ debugger->breakpoints.remove(this);
+ site->breakpoints.remove(this);
+ gc::Cell* cell = site->owningCell();
+ gcx->delete_(cell, this, MemoryUse::Breakpoint);
+}
+
+void Breakpoint::remove(JS::GCContext* gcx) {
+ BreakpointSite* savedSite = site;
+ delete_(gcx);
+
+ savedSite->destroyIfEmpty(gcx);
+}
+
+Breakpoint* Breakpoint::nextInDebugger() { return debuggerLink.mNext; }
+
+Breakpoint* Breakpoint::nextInSite() { return siteLink.mNext; }
+
+JSBreakpointSite::JSBreakpointSite(JSScript* script, jsbytecode* pc)
+ : script(script), pc(pc) {
+ MOZ_ASSERT(!DebugAPI::hasBreakpointsAt(script, pc));
+}
+
+void JSBreakpointSite::remove(JS::GCContext* gcx) {
+ DebugScript::destroyBreakpointSite(gcx, script, pc);
+}
+
+void JSBreakpointSite::trace(JSTracer* trc) {
+ BreakpointSite::trace(trc);
+ TraceEdge(trc, &script, "breakpoint script");
+}
+
+void JSBreakpointSite::delete_(JS::GCContext* gcx) {
+ BreakpointSite::finalize(gcx);
+
+ gcx->delete_(script, this, MemoryUse::BreakpointSite);
+}
+
+gc::Cell* JSBreakpointSite::owningCell() { return script; }
+
+Realm* JSBreakpointSite::realm() const { return script->realm(); }
+
+WasmBreakpointSite::WasmBreakpointSite(WasmInstanceObject* instanceObject_,
+ uint32_t offset_)
+ : instanceObject(instanceObject_), offset(offset_) {
+ MOZ_ASSERT(instanceObject_);
+ MOZ_ASSERT(instanceObject_->instance().debugEnabled());
+}
+
+void WasmBreakpointSite::trace(JSTracer* trc) {
+ BreakpointSite::trace(trc);
+ TraceEdge(trc, &instanceObject, "breakpoint Wasm instance");
+}
+
+void WasmBreakpointSite::remove(JS::GCContext* gcx) {
+ instanceObject->instance().destroyBreakpointSite(gcx, offset);
+}
+
+void WasmBreakpointSite::delete_(JS::GCContext* gcx) {
+ BreakpointSite::finalize(gcx);
+
+ gcx->delete_(instanceObject, this, MemoryUse::BreakpointSite);
+}
+
+gc::Cell* WasmBreakpointSite::owningCell() { return instanceObject; }
+
+Realm* WasmBreakpointSite::realm() const { return instanceObject->realm(); }
+
+/*** Debugger hook dispatch *************************************************/
+
+Debugger::Debugger(JSContext* cx, NativeObject* dbg)
+ : object(dbg),
+ debuggees(cx->zone()),
+ uncaughtExceptionHook(nullptr),
+ allowUnobservedAsmJS(false),
+ allowUnobservedWasm(false),
+ collectCoverageInfo(false),
+ observedGCs(cx->zone()),
+ allocationsLog(cx),
+ trackingAllocationSites(false),
+ allocationSamplingProbability(1.0),
+ maxAllocationsLogLength(DEFAULT_MAX_LOG_LENGTH),
+ allocationsLogOverflowed(false),
+ frames(cx->zone()),
+ generatorFrames(cx),
+ scripts(cx),
+ sources(cx),
+ objects(cx),
+ environments(cx),
+ wasmInstanceScripts(cx),
+ wasmInstanceSources(cx) {
+ cx->check(dbg);
+
+ cx->runtime()->debuggerList().insertBack(this);
+}
+
+template <typename ElementAccess>
+static void RemoveDebuggerEntry(
+ mozilla::DoublyLinkedList<Debugger, ElementAccess>& list, Debugger* dbg) {
+ // The "probably" here is because there could technically be multiple lists
+ // with this type signature and theoretically the debugger could be an entry
+ // in a different one. That is not actually possible however because there
+ // is only one list the debugger could be in.
+ if (list.ElementProbablyInList(dbg)) {
+ list.remove(dbg);
+ }
+}
+
+Debugger::~Debugger() {
+ MOZ_ASSERT(debuggees.empty());
+ allocationsLog.clear();
+
+ // Breakpoints should hold us alive, so any breakpoints remaining must be set
+ // in dying JSScripts. We should clean them up, but this never asserts. I'm
+ // not sure why.
+ MOZ_ASSERT(breakpoints.isEmpty());
+
+ // We don't have to worry about locking here since Debugger is not
+ // background finalized.
+ JSContext* cx = TlsContext.get();
+ RemoveDebuggerEntry(cx->runtime()->onNewGlobalObjectWatchers(), this);
+ RemoveDebuggerEntry(cx->runtime()->onGarbageCollectionWatchers(), this);
+}
+
+#ifdef DEBUG
+/* static */
+bool Debugger::isChildJSObject(JSObject* obj) {
+ return obj->getClass() == &DebuggerFrame::class_ ||
+ obj->getClass() == &DebuggerScript::class_ ||
+ obj->getClass() == &DebuggerSource::class_ ||
+ obj->getClass() == &DebuggerObject::class_ ||
+ obj->getClass() == &DebuggerEnvironment::class_;
+}
+#endif
+
+bool Debugger::hasMemory() const {
+ return object->getReservedSlot(JSSLOT_DEBUG_MEMORY_INSTANCE).isObject();
+}
+
+DebuggerMemory& Debugger::memory() const {
+ MOZ_ASSERT(hasMemory());
+ return object->getReservedSlot(JSSLOT_DEBUG_MEMORY_INSTANCE)
+ .toObject()
+ .as<DebuggerMemory>();
+}
+
+/*** Debugger accessors *******************************************************/
+
+bool Debugger::getFrame(JSContext* cx, const FrameIter& iter,
+ MutableHandleValue vp) {
+ Rooted<DebuggerFrame*> result(cx);
+ if (!Debugger::getFrame(cx, iter, &result)) {
+ return false;
+ }
+ vp.setObject(*result);
+ return true;
+}
+
+bool Debugger::getFrame(JSContext* cx, MutableHandle<DebuggerFrame*> result) {
+ RootedObject proto(
+ cx, &object->getReservedSlot(JSSLOT_DEBUG_FRAME_PROTO).toObject());
+ Rooted<NativeObject*> debugger(cx, object);
+
+ // Since there is no frame/generator data to associate with this frame, this
+ // will create a new, "terminated" Debugger.Frame object.
+ Rooted<DebuggerFrame*> frame(
+ cx, DebuggerFrame::create(cx, proto, debugger, nullptr, nullptr));
+ if (!frame) {
+ return false;
+ }
+
+ result.set(frame);
+ return true;
+}
+
+bool Debugger::getFrame(JSContext* cx, const FrameIter& iter,
+ MutableHandle<DebuggerFrame*> result) {
+ AbstractFramePtr referent = iter.abstractFramePtr();
+ MOZ_ASSERT_IF(referent.hasScript(), !referent.script()->selfHosted());
+
+ FrameMap::AddPtr p = frames.lookupForAdd(referent);
+ if (!p) {
+ Rooted<AbstractGeneratorObject*> genObj(cx);
+ if (referent.isGeneratorFrame()) {
+ if (referent.isFunctionFrame()) {
+ AutoRealm ar(cx, referent.callee());
+ genObj = GetGeneratorObjectForFrame(cx, referent);
+ } else {
+ MOZ_ASSERT(referent.isModuleFrame());
+ AutoRealm ar(cx, referent.script()->module());
+ genObj = GetGeneratorObjectForFrame(cx, referent);
+ }
+
+ // If this frame has a generator associated with it, but no on-stack
+ // Debugger.Frame object was found, there should not be a suspended
+ // Debugger.Frame either because otherwise slowPathOnResumeFrame would
+ // have already populated the "frames" map with a Debugger.Frame.
+ MOZ_ASSERT_IF(genObj, !generatorFrames.has(genObj));
+
+ // If the frame's generator is closed, there is no way to associate the
+ // generator with the frame successfully because there is no way to
+ // get the generator's callee script, and even if we could, having it
+ // there would in no way affect the behavior of the frame.
+ if (genObj && genObj->isClosed()) {
+ genObj = nullptr;
+ }
+
+ // If no AbstractGeneratorObject exists yet, we create a Debugger.Frame
+ // below anyway, and Debugger::onNewGenerator() will associate it
+ // with the AbstractGeneratorObject later when we hit JSOp::Generator.
+ }
+
+ // Create and populate the Debugger.Frame object.
+ RootedObject proto(
+ cx, &object->getReservedSlot(JSSLOT_DEBUG_FRAME_PROTO).toObject());
+ Rooted<NativeObject*> debugger(cx, object);
+
+ Rooted<DebuggerFrame*> frame(
+ cx, DebuggerFrame::create(cx, proto, debugger, &iter, genObj));
+ if (!frame) {
+ return false;
+ }
+
+ auto terminateDebuggerFrameGuard = MakeScopeExit([&] {
+ terminateDebuggerFrame(cx->gcContext(), this, frame, referent);
+ });
+
+ if (genObj) {
+ DependentAddPtr<GeneratorWeakMap> genPtr(cx, generatorFrames, genObj);
+ if (!genPtr.add(cx, generatorFrames, genObj, frame)) {
+ return false;
+ }
+ }
+
+ if (!ensureExecutionObservabilityOfFrame(cx, referent)) {
+ return false;
+ }
+
+ if (!frames.add(p, referent, frame)) {
+ ReportOutOfMemory(cx);
+ return false;
+ }
+
+ terminateDebuggerFrameGuard.release();
+ }
+
+ result.set(p->value());
+ return true;
+}
+
+bool Debugger::getFrame(JSContext* cx, Handle<AbstractGeneratorObject*> genObj,
+ MutableHandle<DebuggerFrame*> result) {
+ // To create a Debugger.Frame for a running generator, we'd also need a
+ // FrameIter for its stack frame. We could make this work by searching the
+ // stack for the generator's frame, but for the moment, we only need this
+ // function to handle generators we've found on promises' reaction records,
+ // which should always be suspended.
+ MOZ_ASSERT(genObj->isSuspended());
+
+ // Do we have an existing Debugger.Frame for this generator?
+ DependentAddPtr<GeneratorWeakMap> p(cx, generatorFrames, genObj);
+ if (p) {
+ MOZ_ASSERT(&p->value()->unwrappedGenerator() == genObj);
+ result.set(p->value());
+ return true;
+ }
+
+ // Create a new Debugger.Frame.
+ RootedObject proto(
+ cx, &object->getReservedSlot(JSSLOT_DEBUG_FRAME_PROTO).toObject());
+ Rooted<NativeObject*> debugger(cx, object);
+
+ result.set(DebuggerFrame::create(cx, proto, debugger, nullptr, genObj));
+ if (!result) {
+ return false;
+ }
+
+ if (!p.add(cx, generatorFrames, genObj, result)) {
+ terminateDebuggerFrame(cx->gcContext(), this, result, NullFramePtr());
+ return false;
+ }
+
+ return true;
+}
+
+static bool DebuggerExists(
+ GlobalObject* global, const std::function<bool(Debugger* dbg)>& predicate) {
+ // The GC analysis can't determine that the predicate can't GC, so let it know
+ // explicitly.
+ JS::AutoSuppressGCAnalysis nogc;
+
+ for (Realm::DebuggerVectorEntry& entry : global->getDebuggers(nogc)) {
+ // Callbacks should not create new references to the debugger, so don't
+ // use a barrier. This allows this method to be called during GC.
+ if (predicate(entry.dbg.unbarrieredGet())) {
+ return true;
+ }
+ }
+ return false;
+}
+
+/* static */
+bool Debugger::hasLiveHook(GlobalObject* global, Hook which) {
+ return DebuggerExists(global,
+ [=](Debugger* dbg) { return dbg->getHook(which); });
+}
+
+/* static */
+bool DebugAPI::debuggerObservesAllExecution(GlobalObject* global) {
+ return DebuggerExists(
+ global, [=](Debugger* dbg) { return dbg->observesAllExecution(); });
+}
+
+/* static */
+bool DebugAPI::debuggerObservesCoverage(GlobalObject* global) {
+ return DebuggerExists(global,
+ [=](Debugger* dbg) { return dbg->observesCoverage(); });
+}
+
+/* static */
+bool DebugAPI::debuggerObservesAsmJS(GlobalObject* global) {
+ return DebuggerExists(global,
+ [=](Debugger* dbg) { return dbg->observesAsmJS(); });
+}
+
+/* static */
+bool DebugAPI::debuggerObservesWasm(GlobalObject* global) {
+ return DebuggerExists(global,
+ [=](Debugger* dbg) { return dbg->observesWasm(); });
+}
+
+/* static */
+bool DebugAPI::hasExceptionUnwindHook(GlobalObject* global) {
+ return Debugger::hasLiveHook(global, Debugger::OnExceptionUnwind);
+}
+
+/* static */
+bool DebugAPI::hasDebuggerStatementHook(GlobalObject* global) {
+ return Debugger::hasLiveHook(global, Debugger::OnDebuggerStatement);
+}
+
+template <typename HookIsEnabledFun /* bool (Debugger*) */>
+bool DebuggerList<HookIsEnabledFun>::init(JSContext* cx) {
+ // Determine which debuggers will receive this event, and in what order.
+ // Make a copy of the list, since the original is mutable and we will be
+ // calling into arbitrary JS.
+ Handle<GlobalObject*> global = cx->global();
+ JS::AutoAssertNoGC nogc;
+ for (Realm::DebuggerVectorEntry& entry : global->getDebuggers(nogc)) {
+ Debugger* dbg = entry.dbg;
+ if (dbg->isHookCallAllowed(cx) && hookIsEnabled(dbg)) {
+ if (!debuggers.append(ObjectValue(*dbg->toJSObject()))) {
+ return false;
+ }
+ }
+ }
+ return true;
+}
+
+template <typename HookIsEnabledFun /* bool (Debugger*) */>
+template <typename FireHookFun /* bool (Debugger*) */>
+bool DebuggerList<HookIsEnabledFun>::dispatchHook(JSContext* cx,
+ FireHookFun fireHook) {
+ // Preserve the debuggee's microtask event queue while we run the hooks, so
+ // the debugger's microtask checkpoints don't run from the debuggee's
+ // microtasks, and vice versa.
+ JS::AutoDebuggerJobQueueInterruption adjqi;
+ if (!adjqi.init(cx)) {
+ return false;
+ }
+
+ // Deliver the event to each debugger, checking again to make sure it
+ // should still be delivered.
+ Handle<GlobalObject*> global = cx->global();
+ for (Value* p = debuggers.begin(); p != debuggers.end(); p++) {
+ Debugger* dbg = Debugger::fromJSObject(&p->toObject());
+ EnterDebuggeeNoExecute nx(cx, *dbg, adjqi);
+ if (dbg->debuggees.has(global) && hookIsEnabled(dbg)) {
+ bool result =
+ dbg->enterDebuggerHook(cx, [&]() -> bool { return fireHook(dbg); });
+ adjqi.runJobs();
+ if (!result) {
+ return false;
+ }
+ }
+ }
+ return true;
+}
+
+template <typename HookIsEnabledFun /* bool (Debugger*) */>
+template <typename FireHookFun /* bool (Debugger*) */>
+void DebuggerList<HookIsEnabledFun>::dispatchQuietHook(JSContext* cx,
+ FireHookFun fireHook) {
+ bool result =
+ dispatchHook(cx, [&](Debugger* dbg) -> bool { return fireHook(dbg); });
+
+ // dispatchHook may fail due to OOM. This OOM is not handlable at the
+ // callsites of dispatchQuietHook in the engine.
+ if (!result) {
+ cx->clearPendingException();
+ }
+}
+
+template <typename HookIsEnabledFun /* bool (Debugger*) */>
+template <typename FireHookFun /* bool (Debugger*, ResumeMode&, MutableHandleValue vp) */>
+bool DebuggerList<HookIsEnabledFun>::dispatchResumptionHook(
+ JSContext* cx, AbstractFramePtr frame, FireHookFun fireHook) {
+ ResumeMode resumeMode = ResumeMode::Continue;
+ RootedValue rval(cx);
+ return dispatchHook(cx,
+ [&](Debugger* dbg) -> bool {
+ return fireHook(dbg, resumeMode, &rval);
+ }) &&
+ ApplyFrameResumeMode(cx, frame, resumeMode, rval);
+}
+
+JSObject* Debugger::getHook(Hook hook) const {
+ MOZ_ASSERT(hook >= 0 && hook < HookCount);
+ const Value& v = object->getReservedSlot(JSSLOT_DEBUG_HOOK_START +
+ std::underlying_type_t<Hook>(hook));
+ return v.isUndefined() ? nullptr : &v.toObject();
+}
+
+bool Debugger::hasAnyLiveHooks() const {
+ // A onNewGlobalObject hook does not hold its Debugger live, so its behavior
+ // is nondeterministic. This behavior is not satisfying, but it is at least
+ // documented.
+ if (getHook(OnDebuggerStatement) || getHook(OnExceptionUnwind) ||
+ getHook(OnNewScript) || getHook(OnEnterFrame)) {
+ return true;
+ }
+
+ return false;
+}
+
+/* static */
+bool DebugAPI::slowPathOnEnterFrame(JSContext* cx, AbstractFramePtr frame) {
+ return Debugger::dispatchResumptionHook(
+ cx, frame,
+ [frame](Debugger* dbg) -> bool {
+ return dbg->observesFrame(frame) && dbg->observesEnterFrame();
+ },
+ [&](Debugger* dbg, ResumeMode& resumeMode, MutableHandleValue vp)
+ -> bool { return dbg->fireEnterFrame(cx, resumeMode, vp); });
+}
+
+/* static */
+bool DebugAPI::slowPathOnResumeFrame(JSContext* cx, AbstractFramePtr frame) {
+ // Don't count on this method to be called every time a generator is
+ // resumed! This is called only if the frame's debuggee bit is set,
+ // i.e. the script has breakpoints or the frame is stepping.
+ MOZ_ASSERT(frame.isGeneratorFrame());
+ MOZ_ASSERT(frame.isDebuggee());
+
+ Rooted<AbstractGeneratorObject*> genObj(
+ cx, GetGeneratorObjectForFrame(cx, frame));
+ MOZ_ASSERT(genObj);
+
+ // If there is an OOM, we mark all of the Debugger.Frame objects terminated
+ // because we want to ensure that none of the frames are in a partially
+ // initialized state where they are in "generatorFrames" but not "frames".
+ auto terminateDebuggerFramesGuard = MakeScopeExit([&] {
+ Debugger::terminateDebuggerFrames(cx, frame);
+
+ MOZ_ASSERT(!DebugAPI::inFrameMaps(frame));
+ });
+
+ // For each debugger, if there is an existing Debugger.Frame object for the
+ // resumed `frame`, update it with the new frame pointer and make sure the
+ // frame is observable.
+ FrameIter iter(cx);
+ MOZ_ASSERT(iter.abstractFramePtr() == frame);
+ {
+ JS::AutoAssertNoGC nogc;
+ for (Realm::DebuggerVectorEntry& entry :
+ frame.global()->getDebuggers(nogc)) {
+ Debugger* dbg = entry.dbg;
+ if (Debugger::GeneratorWeakMap::Ptr generatorEntry =
+ dbg->generatorFrames.lookup(genObj)) {
+ DebuggerFrame* frameObj = generatorEntry->value();
+ MOZ_ASSERT(&frameObj->unwrappedGenerator() == genObj);
+ if (!dbg->frames.putNew(frame, frameObj)) {
+ ReportOutOfMemory(cx);
+ return false;
+ }
+ if (!frameObj->resume(iter)) {
+ return false;
+ }
+ }
+ }
+ }
+
+ terminateDebuggerFramesGuard.release();
+
+ return slowPathOnEnterFrame(cx, frame);
+}
+
+/* static */
+NativeResumeMode DebugAPI::slowPathOnNativeCall(JSContext* cx,
+ const CallArgs& args,
+ CallReason reason) {
+ // "onNativeCall" only works consistently in the context of an explicit eval
+ // (or a function call via DebuggerObject.call/apply) that has set the
+ // "insideDebuggerEvaluationWithOnNativeCallHook" state
+ // on the JSContext, so we fast-path this hook to bail right away if that is
+ // not currently set. If this flag is set to a _different_ debugger, the
+ // standard "isHookCallAllowed" debugger logic will apply and only hooks on
+ // that debugger will be callable.
+ if (!cx->insideDebuggerEvaluationWithOnNativeCallHook) {
+ return NativeResumeMode::Continue;
+ }
+
+ DebuggerList debuggerList(cx, [](Debugger* dbg) -> bool {
+ return dbg->getHook(Debugger::OnNativeCall);
+ });
+
+ if (!debuggerList.init(cx)) {
+ return NativeResumeMode::Abort;
+ }
+
+ if (debuggerList.empty()) {
+ return NativeResumeMode::Continue;
+ }
+
+ // The onNativeCall hook is fired when self hosted functions are called,
+ // and any other self hosted function or C++ native that is directly called
+ // by the self hosted function is considered to be part of the same
+ // native call, except for the following 4 cases:
+ //
+ // * callContentFunction and constructContentFunction,
+ // which uses CallReason::CallContent
+ // * Function.prototype.call and Function.prototype.apply,
+ // which uses CallReason::FunCall
+ // * Getter call which uses CallReason::Getter
+ // * Setter call which uses CallReason::Setter
+ //
+ // We check this only after checking that debuggerList has items in order
+ // to avoid unnecessary calls to cx->currentScript(), which can be expensive
+ // when the top frame is in jitcode.
+ JSScript* script = cx->currentScript();
+ if (script && script->selfHosted() && reason != CallReason::CallContent &&
+ reason != CallReason::FunCall && reason != CallReason::Getter &&
+ reason != CallReason::Setter) {
+ return NativeResumeMode::Continue;
+ }
+
+ RootedValue rval(cx);
+ ResumeMode resumeMode = ResumeMode::Continue;
+ bool result = debuggerList.dispatchHook(cx, [&](Debugger* dbg) -> bool {
+ return dbg->fireNativeCall(cx, args, reason, resumeMode, &rval);
+ });
+ if (!result) {
+ return NativeResumeMode::Abort;
+ }
+
+ // Hook must follow normal native function conventions and not return
+ // primitive values.
+ if (resumeMode == ResumeMode::Return) {
+ if (args.isConstructing() && !rval.isObject()) {
+ JS_ReportErrorASCII(
+ cx, "onNativeCall hook must return an object for constructor call");
+ return NativeResumeMode::Abort;
+ }
+ }
+
+ // The value is not in any particular compartment, so it needs to be
+ // explicitly wrapped into the debuggee compartment.
+ if (!cx->compartment()->wrap(cx, &rval)) {
+ return NativeResumeMode::Abort;
+ }
+
+ switch (resumeMode) {
+ case ResumeMode::Continue:
+ break;
+
+ case ResumeMode::Throw:
+ cx->setPendingException(rval, ShouldCaptureStack::Always);
+ return NativeResumeMode::Abort;
+
+ case ResumeMode::Terminate:
+ cx->clearPendingException();
+ return NativeResumeMode::Abort;
+
+ case ResumeMode::Return:
+ args.rval().set(rval);
+ return NativeResumeMode::Override;
+ }
+
+ return NativeResumeMode::Continue;
+}
+
+/*
+ * RAII class to mark a generator as "running" temporarily while running
+ * debugger code.
+ *
+ * When Debugger::slowPathOnLeaveFrame is called for a frame that is yielding
+ * or awaiting, its generator is in the "suspended" state. Letting script
+ * observe this state, with the generator on stack yet also reenterable, would
+ * be bad, so we mark it running while we fire events.
+ */
+class MOZ_RAII AutoSetGeneratorRunning {
+ int32_t resumeIndex_;
+ AsyncGeneratorObject::State asyncGenState_;
+ Rooted<AbstractGeneratorObject*> genObj_;
+
+ public:
+ AutoSetGeneratorRunning(JSContext* cx,
+ Handle<AbstractGeneratorObject*> genObj)
+ : resumeIndex_(0),
+ asyncGenState_(static_cast<AsyncGeneratorObject::State>(0)),
+ genObj_(cx, genObj) {
+ if (genObj) {
+ if (!genObj->isClosed() && !genObj->isBeforeInitialYield() &&
+ genObj->isSuspended()) {
+ // Yielding or awaiting.
+ resumeIndex_ = genObj->resumeIndex();
+ genObj->setRunning();
+
+ // Async generators have additionally bookkeeping which must be
+ // adjusted when switching over to the running state.
+ if (genObj->is<AsyncGeneratorObject>()) {
+ auto* generator = &genObj->as<AsyncGeneratorObject>();
+ asyncGenState_ = generator->state();
+ generator->setExecuting();
+ }
+ } else {
+ // Returning or throwing. The generator is already closed, if
+ // it was ever exposed at all.
+ genObj_ = nullptr;
+ }
+ }
+ }
+
+ ~AutoSetGeneratorRunning() {
+ if (genObj_) {
+ MOZ_ASSERT(genObj_->isRunning());
+ genObj_->setResumeIndex(resumeIndex_);
+ if (genObj_->is<AsyncGeneratorObject>()) {
+ genObj_->as<AsyncGeneratorObject>().setState(asyncGenState_);
+ }
+ }
+ }
+};
+
+/*
+ * Handle leaving a frame with debuggers watching. |frameOk| indicates whether
+ * the frame is exiting normally or abruptly. Set |cx|'s exception and/or
+ * |cx->fp()|'s return value, and return a new success value.
+ */
+/* static */
+bool DebugAPI::slowPathOnLeaveFrame(JSContext* cx, AbstractFramePtr frame,
+ const jsbytecode* pc, bool frameOk) {
+ MOZ_ASSERT_IF(!frame.isWasmDebugFrame(), pc);
+
+ mozilla::DebugOnly<Handle<GlobalObject*>> debuggeeGlobal = cx->global();
+
+ // These are updated below, but consulted by the cleanup code we register now,
+ // so declare them here, initialized to quiescent values.
+ Rooted<Completion> completion(cx);
+ bool success = false;
+
+ auto frameMapsGuard = MakeScopeExit([&] {
+ // Clean up all Debugger.Frame instances on exit. On suspending, pass the
+ // flag that says to leave those frames `.live`. Note that if the completion
+ // is a suspension but success is false, the generator gets closed, not
+ // suspended.
+ if (success && completion.get().suspending()) {
+ Debugger::suspendGeneratorDebuggerFrames(cx, frame);
+ } else {
+ Debugger::terminateDebuggerFrames(cx, frame);
+ }
+ });
+
+ // The onPop handler and associated clean up logic should not run multiple
+ // times on the same frame. If slowPathOnLeaveFrame has already been
+ // called, the frame will not be present in the Debugger frame maps.
+ Rooted<Debugger::DebuggerFrameVector> frames(cx);
+ if (!Debugger::getDebuggerFrames(frame, &frames)) {
+ // There is at least one match Debugger.Frame we failed to process, so drop
+ // the pending exception and raise an out-of-memory instead.
+ if (!frameOk) {
+ cx->clearPendingException();
+ }
+ ReportOutOfMemory(cx);
+ return false;
+ }
+ if (frames.empty()) {
+ return frameOk;
+ }
+
+ // Convert current exception state into a Completion and clear exception off
+ // of the JSContext.
+ completion = Completion::fromJSFramePop(cx, frame, pc, frameOk);
+
+ ResumeMode resumeMode = ResumeMode::Continue;
+ RootedValue rval(cx);
+
+ {
+ // Preserve the debuggee's microtask event queue while we run the hooks, so
+ // the debugger's microtask checkpoints don't run from the debuggee's
+ // microtasks, and vice versa.
+ JS::AutoDebuggerJobQueueInterruption adjqi;
+ if (!adjqi.init(cx)) {
+ return false;
+ }
+
+ // This path can be hit via unwinding the stack due to over-recursion or
+ // OOM. In those cases, don't fire the frames' onPop handlers, because
+ // invoking JS will only trigger the same condition. See
+ // slowPathOnExceptionUnwind.
+ if (!cx->isThrowingOverRecursed() && !cx->isThrowingOutOfMemory()) {
+ Rooted<AbstractGeneratorObject*> genObj(
+ cx, frame.isGeneratorFrame() ? GetGeneratorObjectForFrame(cx, frame)
+ : nullptr);
+
+ // For each Debugger.Frame, fire its onPop handler, if any.
+ for (size_t i = 0; i < frames.length(); i++) {
+ Handle<DebuggerFrame*> frameobj = frames[i];
+ Debugger* dbg = frameobj->owner();
+ EnterDebuggeeNoExecute nx(cx, *dbg, adjqi);
+
+ // Removing a global from a Debugger's debuggee set kills all of that
+ // Debugger's D.Fs in that global. This means that one D.F's onPop can
+ // kill the next D.F. So we have to check whether frameobj is still "on
+ // the stack".
+ if (frameobj->isOnStack() && frameobj->onPopHandler()) {
+ OnPopHandler* handler = frameobj->onPopHandler();
+
+ bool result = dbg->enterDebuggerHook(cx, [&]() -> bool {
+ ResumeMode nextResumeMode = ResumeMode::Continue;
+ RootedValue nextValue(cx);
+
+ // Call the onPop handler.
+ bool success;
+ {
+ // Mark the generator as running, to prevent reentrance.
+ //
+ // At certain points in a generator's lifetime,
+ // GetGeneratorObjectForFrame can return null even when the
+ // generator exists, but at those points the generator has not yet
+ // been exposed to JavaScript, so reentrance isn't possible
+ // anyway. So there's no harm done if this has no effect in that
+ // case.
+ AutoSetGeneratorRunning asgr(cx, genObj);
+ success = handler->onPop(cx, frameobj, completion, nextResumeMode,
+ &nextValue);
+ }
+
+ return dbg->processParsedHandlerResult(cx, frame, pc, success,
+ nextResumeMode, nextValue,
+ resumeMode, &rval);
+ });
+ adjqi.runJobs();
+
+ if (!result) {
+ return false;
+ }
+
+ // At this point, we are back in the debuggee compartment, and
+ // any error has been wrapped up as a completion value.
+ MOZ_ASSERT(!cx->isExceptionPending());
+ }
+ }
+ }
+ }
+
+ completion.get().updateFromHookResult(resumeMode, rval);
+
+ // Now that we've run all the handlers, extract the final resumption mode. */
+ ResumeMode completionResumeMode;
+ RootedValue completionValue(cx);
+ Rooted<SavedFrame*> completionStack(cx);
+ completion.get().toResumeMode(completionResumeMode, &completionValue,
+ &completionStack);
+
+ // If we are returning the original value used to create the completion, then
+ // we don't want to treat the resumption value as a Return completion, because
+ // that would cause us to apply AdjustGeneratorResumptionValue to the
+ // already-adjusted value that the generator actually returned.
+ if (resumeMode == ResumeMode::Continue &&
+ completionResumeMode == ResumeMode::Return) {
+ completionResumeMode = ResumeMode::Continue;
+ }
+
+ if (!ApplyFrameResumeMode(cx, frame, completionResumeMode, completionValue,
+ completionStack)) {
+ if (!cx->isPropagatingForcedReturn()) {
+ // If this is an exception or termination, we just propagate that along.
+ return false;
+ }
+
+ // Since we are leaving the frame here, we can convert a forced return
+ // into a normal return right away.
+ cx->clearPropagatingForcedReturn();
+ }
+ success = true;
+ return true;
+}
+
+/* static */
+bool DebugAPI::slowPathOnNewGenerator(JSContext* cx, AbstractFramePtr frame,
+ Handle<AbstractGeneratorObject*> genObj) {
+ // This is called from JSOp::Generator, after default parameter expressions
+ // are evaluated and well after onEnterFrame, so Debugger.Frame objects for
+ // `frame` may already have been exposed to debugger code. The
+ // AbstractGeneratorObject for this generator call, though, has just been
+ // created. It must be associated with any existing Debugger.Frames.
+
+ // Initializing frames with their associated generator is critical to the
+ // functionality of the debugger, so if there is an OOM, we want to
+ // cleanly terminate all of the frames.
+ auto terminateDebuggerFramesGuard =
+ MakeScopeExit([&] { Debugger::terminateDebuggerFrames(cx, frame); });
+
+ bool ok = true;
+ gc::AutoSuppressGC nogc(cx);
+ Debugger::forEachOnStackDebuggerFrame(
+ frame, nogc, [&](Debugger* dbg, DebuggerFrame* frameObjPtr) {
+ if (!ok) {
+ return;
+ }
+
+ Rooted<DebuggerFrame*> frameObj(cx, frameObjPtr);
+
+ AutoRealm ar(cx, frameObj);
+
+ if (!DebuggerFrame::setGeneratorInfo(cx, frameObj, genObj)) {
+ // This leaves `genObj` and `frameObj` unassociated. It's OK
+ // because we won't pause again with this generator on the stack:
+ // the caller will immediately discard `genObj` and unwind `frame`.
+ ok = false;
+ return;
+ }
+
+ DependentAddPtr<Debugger::GeneratorWeakMap> genPtr(
+ cx, dbg->generatorFrames, genObj);
+ if (!genPtr.add(cx, dbg->generatorFrames, genObj, frameObj)) {
+ ok = false;
+ }
+ });
+
+ if (!ok) {
+ return false;
+ }
+
+ terminateDebuggerFramesGuard.release();
+ return true;
+}
+
+/* static */
+bool DebugAPI::slowPathOnDebuggerStatement(JSContext* cx,
+ AbstractFramePtr frame) {
+ return Debugger::dispatchResumptionHook(
+ cx, frame,
+ [](Debugger* dbg) -> bool {
+ return dbg->getHook(Debugger::OnDebuggerStatement);
+ },
+ [&](Debugger* dbg, ResumeMode& resumeMode, MutableHandleValue vp)
+ -> bool { return dbg->fireDebuggerStatement(cx, resumeMode, vp); });
+}
+
+/* static */
+bool DebugAPI::slowPathOnExceptionUnwind(JSContext* cx,
+ AbstractFramePtr frame) {
+ // Invoking more JS on an over-recursed stack or after OOM is only going
+ // to result in more of the same error.
+ if (cx->isThrowingOverRecursed() || cx->isThrowingOutOfMemory()) {
+ return true;
+ }
+
+ // The Debugger API mustn't muck with frames from self-hosted scripts.
+ if (frame.hasScript() && frame.script()->selfHosted()) {
+ return true;
+ }
+
+ DebuggerList debuggerList(cx, [](Debugger* dbg) -> bool {
+ return dbg->getHook(Debugger::OnExceptionUnwind);
+ });
+
+ if (!debuggerList.init(cx)) {
+ return false;
+ }
+
+ if (debuggerList.empty()) {
+ return true;
+ }
+
+ // We save and restore the exception once up front to avoid having to do it
+ // for each 'onExceptionUnwind' hook that has been registered, and we also
+ // only do it if the debuggerList contains items in order to avoid extra work.
+ RootedValue exc(cx);
+ Rooted<SavedFrame*> stack(cx, cx->getPendingExceptionStack());
+ if (!cx->getPendingException(&exc)) {
+ return false;
+ }
+ cx->clearPendingException();
+
+ bool result = debuggerList.dispatchResumptionHook(
+ cx, frame,
+ [&](Debugger* dbg, ResumeMode& resumeMode,
+ MutableHandleValue vp) -> bool {
+ return dbg->fireExceptionUnwind(cx, exc, resumeMode, vp);
+ });
+ if (!result) {
+ return false;
+ }
+
+ cx->setPendingException(exc, stack);
+ return true;
+}
+
+// TODO: Remove Remove this function when all properties/methods returning a
+/// DebuggerEnvironment have been given a C++ interface (bug 1271649).
+bool Debugger::wrapEnvironment(JSContext* cx, Handle<Env*> env,
+ MutableHandleValue rval) {
+ if (!env) {
+ rval.setNull();
+ return true;
+ }
+
+ Rooted<DebuggerEnvironment*> envobj(cx);
+
+ if (!wrapEnvironment(cx, env, &envobj)) {
+ return false;
+ }
+
+ rval.setObject(*envobj);
+ return true;
+}
+
+bool Debugger::wrapEnvironment(JSContext* cx, Handle<Env*> env,
+ MutableHandle<DebuggerEnvironment*> result) {
+ MOZ_ASSERT(env);
+
+ // DebuggerEnv should only wrap a debug scope chain obtained (transitively)
+ // from GetDebugEnvironmentFor(Frame|Function).
+ MOZ_ASSERT(!IsSyntacticEnvironment(env));
+
+ DependentAddPtr<EnvironmentWeakMap> p(cx, environments, env);
+ if (p) {
+ result.set(&p->value()->as<DebuggerEnvironment>());
+ } else {
+ // Create a new Debugger.Environment for env.
+ RootedObject proto(
+ cx, &object->getReservedSlot(JSSLOT_DEBUG_ENV_PROTO).toObject());
+ Rooted<NativeObject*> debugger(cx, object);
+
+ Rooted<DebuggerEnvironment*> envobj(
+ cx, DebuggerEnvironment::create(cx, proto, env, debugger));
+ if (!envobj) {
+ return false;
+ }
+
+ if (!p.add(cx, environments, env, envobj)) {
+ // We need to destroy the edge to the referent, to avoid trying to trace
+ // it during untimely collections.
+ envobj->clearReferent();
+ return false;
+ }
+
+ result.set(envobj);
+ }
+
+ return true;
+}
+
+bool Debugger::wrapDebuggeeValue(JSContext* cx, MutableHandleValue vp) {
+ cx->check(object.get());
+
+ if (vp.isObject()) {
+ RootedObject obj(cx, &vp.toObject());
+ Rooted<DebuggerObject*> dobj(cx);
+
+ if (!wrapDebuggeeObject(cx, obj, &dobj)) {
+ return false;
+ }
+
+ vp.setObject(*dobj);
+ } else if (vp.isMagic()) {
+ Rooted<PlainObject*> optObj(cx, NewPlainObject(cx));
+ if (!optObj) {
+ return false;
+ }
+
+ // We handle three sentinel values: missing arguments
+ // (JS_MISSING_ARGUMENTS), optimized out slots (JS_OPTIMIZED_OUT),
+ // and uninitialized bindings (JS_UNINITIALIZED_LEXICAL).
+ //
+ // Other magic values should not have escaped.
+ PropertyName* name;
+ switch (vp.whyMagic()) {
+ case JS_MISSING_ARGUMENTS:
+ name = cx->names().missingArguments;
+ break;
+ case JS_OPTIMIZED_OUT:
+ name = cx->names().optimizedOut;
+ break;
+ case JS_UNINITIALIZED_LEXICAL:
+ name = cx->names().uninitialized;
+ break;
+ default:
+ MOZ_CRASH("Unsupported magic value escaped to Debugger");
+ }
+
+ RootedValue trueVal(cx, BooleanValue(true));
+ if (!DefineDataProperty(cx, optObj, name, trueVal)) {
+ return false;
+ }
+
+ vp.setObject(*optObj);
+ } else if (!cx->compartment()->wrap(cx, vp)) {
+ vp.setUndefined();
+ return false;
+ }
+
+ return true;
+}
+
+bool Debugger::wrapNullableDebuggeeObject(
+ JSContext* cx, HandleObject obj, MutableHandle<DebuggerObject*> result) {
+ if (!obj) {
+ result.set(nullptr);
+ return true;
+ }
+
+ return wrapDebuggeeObject(cx, obj, result);
+}
+
+bool Debugger::wrapDebuggeeObject(JSContext* cx, HandleObject obj,
+ MutableHandle<DebuggerObject*> result) {
+ MOZ_ASSERT(obj);
+
+ DependentAddPtr<ObjectWeakMap> p(cx, objects, obj);
+ if (p) {
+ result.set(&p->value()->as<DebuggerObject>());
+ } else {
+ // Create a new Debugger.Object for obj.
+ Rooted<NativeObject*> debugger(cx, object);
+ RootedObject proto(
+ cx, &object->getReservedSlot(JSSLOT_DEBUG_OBJECT_PROTO).toObject());
+ Rooted<DebuggerObject*> dobj(
+ cx, DebuggerObject::create(cx, proto, obj, debugger));
+ if (!dobj) {
+ return false;
+ }
+
+ if (!p.add(cx, objects, obj, dobj)) {
+ // We need to destroy the edge to the referent, to avoid trying to trace
+ // it during untimely collections.
+ dobj->clearReferent();
+ return false;
+ }
+
+ result.set(dobj);
+ }
+
+ return true;
+}
+
+static DebuggerObject* ToNativeDebuggerObject(JSContext* cx,
+ MutableHandleObject obj) {
+ if (!obj->is<DebuggerObject>()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_NOT_EXPECTED_TYPE, "Debugger",
+ "Debugger.Object", obj->getClass()->name);
+ return nullptr;
+ }
+
+ return &obj->as<DebuggerObject>();
+}
+
+bool Debugger::unwrapDebuggeeObject(JSContext* cx, MutableHandleObject obj) {
+ DebuggerObject* ndobj = ToNativeDebuggerObject(cx, obj);
+ if (!ndobj) {
+ return false;
+ }
+
+ if (ndobj->owner() != Debugger::fromJSObject(object)) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_DEBUG_WRONG_OWNER, "Debugger.Object");
+ return false;
+ }
+
+ obj.set(ndobj->referent());
+ return true;
+}
+
+bool Debugger::unwrapDebuggeeValue(JSContext* cx, MutableHandleValue vp) {
+ cx->check(object.get(), vp);
+ if (vp.isObject()) {
+ RootedObject dobj(cx, &vp.toObject());
+ if (!unwrapDebuggeeObject(cx, &dobj)) {
+ return false;
+ }
+ vp.setObject(*dobj);
+ }
+ return true;
+}
+
+static bool CheckArgCompartment(JSContext* cx, JSObject* obj, JSObject* arg,
+ const char* methodname, const char* propname) {
+ if (arg->compartment() != obj->compartment()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_DEBUG_COMPARTMENT_MISMATCH, methodname,
+ propname);
+ return false;
+ }
+ return true;
+}
+
+static bool CheckArgCompartment(JSContext* cx, JSObject* obj, HandleValue v,
+ const char* methodname, const char* propname) {
+ if (v.isObject()) {
+ return CheckArgCompartment(cx, obj, &v.toObject(), methodname, propname);
+ }
+ return true;
+}
+
+bool Debugger::unwrapPropertyDescriptor(
+ JSContext* cx, HandleObject obj, MutableHandle<PropertyDescriptor> desc) {
+ if (desc.hasValue()) {
+ RootedValue value(cx, desc.value());
+ if (!unwrapDebuggeeValue(cx, &value) ||
+ !CheckArgCompartment(cx, obj, value, "defineProperty", "value")) {
+ return false;
+ }
+ desc.setValue(value);
+ }
+
+ if (desc.hasGetter()) {
+ RootedObject get(cx, desc.getter());
+ if (get) {
+ if (!unwrapDebuggeeObject(cx, &get)) {
+ return false;
+ }
+ if (!CheckArgCompartment(cx, obj, get, "defineProperty", "get")) {
+ return false;
+ }
+ }
+ desc.setGetter(get);
+ }
+
+ if (desc.hasSetter()) {
+ RootedObject set(cx, desc.setter());
+ if (set) {
+ if (!unwrapDebuggeeObject(cx, &set)) {
+ return false;
+ }
+ if (!CheckArgCompartment(cx, obj, set, "defineProperty", "set")) {
+ return false;
+ }
+ }
+ desc.setSetter(set);
+ }
+
+ return true;
+}
+
+/*** Debuggee resumption values and debugger error handling *****************/
+
+static bool GetResumptionProperty(JSContext* cx, HandleObject obj,
+ Handle<PropertyName*> name,
+ ResumeMode namedMode, ResumeMode& resumeMode,
+ MutableHandleValue vp, int* hits) {
+ bool found;
+ if (!HasProperty(cx, obj, name, &found)) {
+ return false;
+ }
+ if (found) {
+ ++*hits;
+ resumeMode = namedMode;
+ if (!GetProperty(cx, obj, obj, name, vp)) {
+ return false;
+ }
+ }
+ return true;
+}
+
+bool js::ParseResumptionValue(JSContext* cx, HandleValue rval,
+ ResumeMode& resumeMode, MutableHandleValue vp) {
+ if (rval.isUndefined()) {
+ resumeMode = ResumeMode::Continue;
+ vp.setUndefined();
+ return true;
+ }
+ if (rval.isNull()) {
+ resumeMode = ResumeMode::Terminate;
+ vp.setUndefined();
+ return true;
+ }
+
+ int hits = 0;
+ if (rval.isObject()) {
+ RootedObject obj(cx, &rval.toObject());
+ if (!GetResumptionProperty(cx, obj, cx->names().return_, ResumeMode::Return,
+ resumeMode, vp, &hits)) {
+ return false;
+ }
+ if (!GetResumptionProperty(cx, obj, cx->names().throw_, ResumeMode::Throw,
+ resumeMode, vp, &hits)) {
+ return false;
+ }
+ }
+
+ if (hits != 1) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_DEBUG_BAD_RESUMPTION);
+ return false;
+ }
+ return true;
+}
+
+static bool CheckResumptionValue(JSContext* cx, AbstractFramePtr frame,
+ const jsbytecode* pc, ResumeMode resumeMode,
+ MutableHandleValue vp) {
+ // Only forced returns from a frame need to be validated because forced
+ // throw values behave just like debuggee `throw` statements. Since
+ // forced-return is all custom logic within SpiderMonkey itself, we need
+ // our own custom validation for it to conform with what is expected.
+ if (resumeMode != ResumeMode::Return || !frame) {
+ return true;
+ }
+
+ // This replicates the ECMA spec's behavior for [[Construct]] in derived
+ // class constructors (section 9.2.2 of ECMA262-2020), where returning a
+ // non-undefined primitive causes an exception tobe thrown.
+ if (frame.debuggerNeedsCheckPrimitiveReturn() && vp.isPrimitive()) {
+ if (!vp.isUndefined()) {
+ ReportValueError(cx, JSMSG_BAD_DERIVED_RETURN, JSDVG_IGNORE_STACK, vp,
+ nullptr);
+ return false;
+ }
+
+ RootedValue thisv(cx);
+ {
+ AutoRealm ar(cx, frame.environmentChain());
+ if (!GetThisValueForDebuggerFrameMaybeOptimizedOut(cx, frame, pc,
+ &thisv)) {
+ return false;
+ }
+ }
+
+ if (thisv.isMagic(JS_UNINITIALIZED_LEXICAL)) {
+ return ThrowUninitializedThis(cx);
+ }
+ MOZ_ASSERT(!thisv.isMagic());
+
+ if (!cx->compartment()->wrap(cx, &thisv)) {
+ return false;
+ }
+ vp.set(thisv);
+ }
+
+ // Check for forcing return from a generator before the initial yield. This
+ // is not supported because some engine-internal code assumes a call to a
+ // generator will return a GeneratorObject; see bug 1477084.
+ if (frame.isFunctionFrame() && frame.callee()->isGenerator()) {
+ Rooted<AbstractGeneratorObject*> genObj(cx);
+ {
+ AutoRealm ar(cx, frame.callee());
+ genObj = GetGeneratorObjectForFrame(cx, frame);
+ }
+
+ if (!genObj || genObj->isBeforeInitialYield()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_DEBUG_FORCED_RETURN_DISALLOWED);
+ return false;
+ }
+ }
+
+ return true;
+}
+
+// Last-minute sanity adjustments to resumption.
+//
+// This is called last, as we leave the debugger. It must happen outside the
+// control of the uncaughtExceptionHook, because this code assumes we won't
+// change our minds and continue execution--we must not close the generator
+// object unless we're really going to force-return.
+[[nodiscard]] static bool AdjustGeneratorResumptionValue(
+ JSContext* cx, AbstractFramePtr frame, ResumeMode& resumeMode,
+ MutableHandleValue vp) {
+ if (resumeMode != ResumeMode::Return && resumeMode != ResumeMode::Throw) {
+ return true;
+ }
+
+ if (!frame) {
+ return true;
+ }
+ // Async modules need to be handled separately, as they do not have a callee.
+ // frame.callee will throw if it is called on a moduleFrame.
+ bool isAsyncModule = frame.isModuleFrame() && frame.script()->isAsync();
+ if (!frame.isFunctionFrame() && !isAsyncModule) {
+ return true;
+ }
+
+ // Treat `{return: <value>}` like a `return` statement. Simulate what the
+ // debuggee would do for an ordinary `return` statement, using a few bytecode
+ // instructions. It's simpler to do the work manually than to count on that
+ // bytecode sequence existing in the debuggee, somehow jump to it, and then
+ // avoid re-entering the debugger from it.
+ //
+ // Similarly treat `{throw: <value>}` like a `throw` statement.
+ //
+ // Note: Async modules use the same handling as async functions.
+ if (frame.isFunctionFrame() && frame.callee()->isGenerator()) {
+ // Throw doesn't require any special processing for (async) generators.
+ if (resumeMode == ResumeMode::Throw) {
+ return true;
+ }
+
+ // Forcing return from a (possibly async) generator.
+ Rooted<AbstractGeneratorObject*> genObj(
+ cx, GetGeneratorObjectForFrame(cx, frame));
+
+ // We already went through CheckResumptionValue, which would have replaced
+ // this invalid resumption value with an error if we were trying to force
+ // return before the initial yield.
+ MOZ_RELEASE_ASSERT(genObj && !genObj->isBeforeInitialYield());
+
+ // 1. `return <value>` creates and returns a new object,
+ // `{value: <value>, done: true}`.
+ //
+ // For non-async generators, the iterator result object is created in
+ // bytecode, so we have to simulate that here. For async generators, our
+ // C++ implementation of AsyncGeneratorResolve will do this. So don't do it
+ // twice:
+ if (!genObj->is<AsyncGeneratorObject>()) {
+ PlainObject* pair = CreateIterResultObject(cx, vp, true);
+ if (!pair) {
+ return false;
+ }
+ vp.setObject(*pair);
+ }
+
+ // 2. The generator must be closed.
+ genObj->setClosed();
+
+ // Async generators have additionally bookkeeping which must be adjusted
+ // when switching over to the closed state.
+ if (genObj->is<AsyncGeneratorObject>()) {
+ genObj->as<AsyncGeneratorObject>().setCompleted();
+ }
+ } else if (isAsyncModule || frame.callee()->isAsync()) {
+ if (AbstractGeneratorObject* genObj =
+ GetGeneratorObjectForFrame(cx, frame)) {
+ // Throw doesn't require any special processing for async functions when
+ // the internal generator object is already present.
+ if (resumeMode == ResumeMode::Throw) {
+ return true;
+ }
+
+ Rooted<AsyncFunctionGeneratorObject*> generator(
+ cx, &genObj->as<AsyncFunctionGeneratorObject>());
+
+ // 1. `return <value>` fulfills and returns the async function's promise.
+ Rooted<PromiseObject*> promise(cx, generator->promise());
+ if (promise->state() == JS::PromiseState::Pending) {
+ if (!AsyncFunctionResolve(cx, generator, vp,
+ AsyncFunctionResolveKind::Fulfill)) {
+ return false;
+ }
+ }
+ vp.setObject(*promise);
+
+ // 2. The generator must be closed.
+ generator->setClosed();
+ } else {
+ // We're before entering the actual function code.
+
+ // 1. `throw <value>` creates a promise rejected with the value *vp.
+ // 1. `return <value>` creates a promise resolved with the value *vp.
+ JSObject* promise = resumeMode == ResumeMode::Throw
+ ? PromiseObject::unforgeableReject(cx, vp)
+ : PromiseObject::unforgeableResolve(cx, vp);
+ if (!promise) {
+ return false;
+ }
+ vp.setObject(*promise);
+
+ // 2. Return normally in both cases.
+ resumeMode = ResumeMode::Return;
+ }
+ }
+
+ return true;
+}
+
+bool Debugger::processParsedHandlerResult(JSContext* cx, AbstractFramePtr frame,
+ const jsbytecode* pc, bool success,
+ ResumeMode resumeMode,
+ HandleValue value,
+ ResumeMode& resultMode,
+ MutableHandleValue vp) {
+ RootedValue rootValue(cx, value);
+ if (!success || !prepareResumption(cx, frame, pc, resumeMode, &rootValue)) {
+ RootedValue exceptionRv(cx);
+ if (!callUncaughtExceptionHandler(cx, &exceptionRv) ||
+ !ParseResumptionValue(cx, exceptionRv, resumeMode, &rootValue) ||
+ !prepareResumption(cx, frame, pc, resumeMode, &rootValue)) {
+ return false;
+ }
+ }
+
+ // Since debugger hooks accumulate into the same final value handle, we
+ // use that to throw if multiple hooks try to set a resumption value.
+ if (resumeMode != ResumeMode::Continue) {
+ if (resultMode != ResumeMode::Continue) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_DEBUG_RESUMPTION_CONFLICT);
+ return false;
+ }
+
+ vp.set(rootValue);
+ resultMode = resumeMode;
+ }
+
+ return true;
+}
+
+bool Debugger::processHandlerResult(JSContext* cx, bool success, HandleValue rv,
+ AbstractFramePtr frame, jsbytecode* pc,
+ ResumeMode& resultMode,
+ MutableHandleValue vp) {
+ ResumeMode resumeMode = ResumeMode::Continue;
+ RootedValue value(cx);
+ if (success) {
+ success = ParseResumptionValue(cx, rv, resumeMode, &value);
+ }
+ return processParsedHandlerResult(cx, frame, pc, success, resumeMode, value,
+ resultMode, vp);
+}
+
+bool Debugger::prepareResumption(JSContext* cx, AbstractFramePtr frame,
+ const jsbytecode* pc, ResumeMode& resumeMode,
+ MutableHandleValue vp) {
+ return unwrapDebuggeeValue(cx, vp) &&
+ CheckResumptionValue(cx, frame, pc, resumeMode, vp);
+}
+
+bool Debugger::callUncaughtExceptionHandler(JSContext* cx,
+ MutableHandleValue vp) {
+ // Uncaught exceptions arise from Debugger code, and so we must already be in
+ // an NX section. This also establishes that we are already within the scope
+ // of an AutoDebuggerJobQueueInterruption object.
+ MOZ_ASSERT(EnterDebuggeeNoExecute::isLockedInStack(cx, *this));
+
+ if (cx->isExceptionPending() && uncaughtExceptionHook) {
+ RootedValue exc(cx);
+ if (!cx->getPendingException(&exc)) {
+ return false;
+ }
+ cx->clearPendingException();
+
+ RootedValue fval(cx, ObjectValue(*uncaughtExceptionHook));
+ if (js::Call(cx, fval, object, exc, vp)) {
+ return true;
+ }
+ }
+ return false;
+}
+
+bool Debugger::handleUncaughtException(JSContext* cx) {
+ RootedValue rv(cx);
+
+ return callUncaughtExceptionHandler(cx, &rv);
+}
+
+void Debugger::reportUncaughtException(JSContext* cx) {
+ // Uncaught exceptions arise from Debugger code, and so we must already be
+ // in an NX section.
+ MOZ_ASSERT(EnterDebuggeeNoExecute::isLockedInStack(cx, *this));
+
+ if (cx->isExceptionPending()) {
+ // We want to report the pending exception, but we want to let the
+ // embedding handle it however it wants to. So pretend like we're
+ // starting a new script execution on our current compartment (which
+ // is the debugger compartment, so reported errors won't get
+ // reported to various onerror handlers in debuggees) and as part of
+ // that "execution" simply throw our exception so the embedding can
+ // deal.
+ RootedValue exn(cx);
+ if (cx->getPendingException(&exn)) {
+ // Clear the exception, because ReportErrorToGlobal will assert that
+ // we don't have one.
+ cx->clearPendingException();
+ ReportErrorToGlobal(cx, cx->global(), exn);
+ }
+
+ // And if not, or if PrepareScriptEnvironmentAndInvoke somehow left an
+ // exception on cx (which it totally shouldn't do), just give up.
+ cx->clearPendingException();
+ }
+}
+
+/*** Debuggee completion values *********************************************/
+
+/* static */
+Completion Completion::fromJSResult(JSContext* cx, bool ok, const Value& rv) {
+ MOZ_ASSERT_IF(ok, !cx->isExceptionPending());
+
+ if (ok) {
+ return Completion(Return(rv));
+ }
+
+ if (!cx->isExceptionPending()) {
+ return Completion(Terminate());
+ }
+
+ RootedValue exception(cx);
+ Rooted<SavedFrame*> stack(cx, cx->getPendingExceptionStack());
+ bool getSucceeded = cx->getPendingException(&exception);
+ cx->clearPendingException();
+ if (!getSucceeded) {
+ return Completion(Terminate());
+ }
+
+ return Completion(Throw(exception, stack));
+}
+
+/* static */
+Completion Completion::fromJSFramePop(JSContext* cx, AbstractFramePtr frame,
+ const jsbytecode* pc, bool ok) {
+ // Only Wasm frames get a null pc.
+ MOZ_ASSERT_IF(!frame.isWasmDebugFrame(), pc);
+
+ // If this isn't a generator suspension, then that's already handled above.
+ if (!ok || !frame.isGeneratorFrame()) {
+ return fromJSResult(cx, ok, frame.returnValue());
+ }
+
+ // A generator is being suspended or returning.
+
+ // Since generators are never wasm, we can assume pc is not nullptr, and
+ // that analyzing bytecode is meaningful.
+ MOZ_ASSERT(!frame.isWasmDebugFrame());
+
+ // If we're leaving successfully at a yield opcode, we're probably
+ // suspending; the `isClosed()` check detects a debugger forced return from
+ // an `onStep` handler, which looks almost the same.
+ //
+ // GetGeneratorObjectForFrame can return nullptr even when a generator
+ // object does exist, if the frame is paused between the Generator and
+ // SetAliasedVar opcodes. But by checking the opcode first we eliminate that
+ // possibility, so it's fine to call genObj->isClosed().
+ Rooted<AbstractGeneratorObject*> generatorObj(
+ cx, GetGeneratorObjectForFrame(cx, frame));
+ switch (JSOp(*pc)) {
+ case JSOp::InitialYield:
+ MOZ_ASSERT(!generatorObj->isClosed());
+ return Completion(InitialYield(generatorObj));
+
+ case JSOp::Yield:
+ MOZ_ASSERT(!generatorObj->isClosed());
+ return Completion(Yield(generatorObj, frame.returnValue()));
+
+ case JSOp::Await:
+ MOZ_ASSERT(!generatorObj->isClosed());
+ return Completion(Await(generatorObj, frame.returnValue()));
+
+ default:
+ return Completion(Return(frame.returnValue()));
+ }
+}
+
+void Completion::trace(JSTracer* trc) {
+ variant.match([=](auto& var) { var.trace(trc); });
+}
+
+struct MOZ_STACK_CLASS Completion::BuildValueMatcher {
+ JSContext* cx;
+ Debugger* dbg;
+ MutableHandleValue result;
+
+ BuildValueMatcher(JSContext* cx, Debugger* dbg, MutableHandleValue result)
+ : cx(cx), dbg(dbg), result(result) {
+ cx->check(dbg->toJSObject());
+ }
+
+ bool operator()(const Completion::Return& ret) {
+ Rooted<NativeObject*> obj(cx, newObject());
+ RootedValue retval(cx, ret.value);
+ if (!obj || !wrap(&retval) || !add(obj, cx->names().return_, retval)) {
+ return false;
+ }
+ result.setObject(*obj);
+ return true;
+ }
+
+ bool operator()(const Completion::Throw& thr) {
+ Rooted<NativeObject*> obj(cx, newObject());
+ RootedValue exc(cx, thr.exception);
+ if (!obj || !wrap(&exc) || !add(obj, cx->names().throw_, exc)) {
+ return false;
+ }
+ if (thr.stack) {
+ RootedValue stack(cx, ObjectValue(*thr.stack));
+ if (!wrapStack(&stack) || !add(obj, cx->names().stack, stack)) {
+ return false;
+ }
+ }
+ result.setObject(*obj);
+ return true;
+ }
+
+ bool operator()(const Completion::Terminate& term) {
+ result.setNull();
+ return true;
+ }
+
+ bool operator()(const Completion::InitialYield& initialYield) {
+ Rooted<NativeObject*> obj(cx, newObject());
+ RootedValue gen(cx, ObjectValue(*initialYield.generatorObject));
+ if (!obj || !wrap(&gen) || !add(obj, cx->names().return_, gen) ||
+ !add(obj, cx->names().yield, TrueHandleValue) ||
+ !add(obj, cx->names().initial, TrueHandleValue)) {
+ return false;
+ }
+ result.setObject(*obj);
+ return true;
+ }
+
+ bool operator()(const Completion::Yield& yield) {
+ Rooted<NativeObject*> obj(cx, newObject());
+ RootedValue iteratorResult(cx, yield.iteratorResult);
+ if (!obj || !wrap(&iteratorResult) ||
+ !add(obj, cx->names().return_, iteratorResult) ||
+ !add(obj, cx->names().yield, TrueHandleValue)) {
+ return false;
+ }
+ result.setObject(*obj);
+ return true;
+ }
+
+ bool operator()(const Completion::Await& await) {
+ Rooted<NativeObject*> obj(cx, newObject());
+ RootedValue awaitee(cx, await.awaitee);
+ if (!obj || !wrap(&awaitee) || !add(obj, cx->names().return_, awaitee) ||
+ !add(obj, cx->names().await, TrueHandleValue)) {
+ return false;
+ }
+ result.setObject(*obj);
+ return true;
+ }
+
+ private:
+ NativeObject* newObject() const { return NewPlainObject(cx); }
+
+ bool add(Handle<NativeObject*> obj, PropertyName* name,
+ HandleValue value) const {
+ return NativeDefineDataProperty(cx, obj, name, value, JSPROP_ENUMERATE);
+ }
+
+ bool wrap(MutableHandleValue v) const {
+ return dbg->wrapDebuggeeValue(cx, v);
+ }
+
+ // Saved stacks are wrapped for direct consumption by debugger code.
+ bool wrapStack(MutableHandleValue stack) const {
+ return cx->compartment()->wrap(cx, stack);
+ }
+};
+
+bool Completion::buildCompletionValue(JSContext* cx, Debugger* dbg,
+ MutableHandleValue result) const {
+ return variant.match(BuildValueMatcher(cx, dbg, result));
+}
+
+void Completion::updateFromHookResult(ResumeMode resumeMode,
+ HandleValue value) {
+ switch (resumeMode) {
+ case ResumeMode::Continue:
+ // No change to how we'll resume.
+ break;
+
+ case ResumeMode::Throw:
+ // Since this is a new exception, the stack for the old one may not apply.
+ // If we extend resumption values to specify stacks, we could revisit
+ // this.
+ variant = Variant(Throw(value, nullptr));
+ break;
+
+ case ResumeMode::Terminate:
+ variant = Variant(Terminate());
+ break;
+
+ case ResumeMode::Return:
+ variant = Variant(Return(value));
+ break;
+
+ default:
+ MOZ_CRASH("invalid resumeMode value");
+ }
+}
+
+struct MOZ_STACK_CLASS Completion::ToResumeModeMatcher {
+ MutableHandleValue value;
+ MutableHandle<SavedFrame*> exnStack;
+ ToResumeModeMatcher(MutableHandleValue value,
+ MutableHandle<SavedFrame*> exnStack)
+ : value(value), exnStack(exnStack) {}
+
+ ResumeMode operator()(const Return& ret) {
+ value.set(ret.value);
+ return ResumeMode::Return;
+ }
+
+ ResumeMode operator()(const Throw& thr) {
+ value.set(thr.exception);
+ exnStack.set(thr.stack);
+ return ResumeMode::Throw;
+ }
+
+ ResumeMode operator()(const Terminate& term) {
+ value.setUndefined();
+ return ResumeMode::Terminate;
+ }
+
+ ResumeMode operator()(const InitialYield& initialYield) {
+ value.setObject(*initialYield.generatorObject);
+ return ResumeMode::Return;
+ }
+
+ ResumeMode operator()(const Yield& yield) {
+ value.set(yield.iteratorResult);
+ return ResumeMode::Return;
+ }
+
+ ResumeMode operator()(const Await& await) {
+ value.set(await.awaitee);
+ return ResumeMode::Return;
+ }
+};
+
+void Completion::toResumeMode(ResumeMode& resumeMode, MutableHandleValue value,
+ MutableHandle<SavedFrame*> exnStack) const {
+ resumeMode = variant.match(ToResumeModeMatcher(value, exnStack));
+}
+
+/*** Firing debugger hooks **************************************************/
+
+static bool CallMethodIfPresent(JSContext* cx, HandleObject obj,
+ const char* name, size_t argc, Value* argv,
+ MutableHandleValue rval) {
+ rval.setUndefined();
+ JSAtom* atom = Atomize(cx, name, strlen(name));
+ if (!atom) {
+ return false;
+ }
+
+ RootedId id(cx, AtomToId(atom));
+ RootedValue fval(cx);
+ if (!GetProperty(cx, obj, obj, id, &fval)) {
+ return false;
+ }
+
+ if (!IsCallable(fval)) {
+ return true;
+ }
+
+ InvokeArgs args(cx);
+ if (!args.init(cx, argc)) {
+ return false;
+ }
+
+ for (size_t i = 0; i < argc; i++) {
+ args[i].set(argv[i]);
+ }
+
+ rval.setObject(*obj); // overwritten by successful Call
+ return js::Call(cx, fval, rval, args, rval);
+}
+
+bool Debugger::fireDebuggerStatement(JSContext* cx, ResumeMode& resumeMode,
+ MutableHandleValue vp) {
+ RootedObject hook(cx, getHook(OnDebuggerStatement));
+ MOZ_ASSERT(hook);
+ MOZ_ASSERT(hook->isCallable());
+
+ ScriptFrameIter iter(cx);
+ RootedValue scriptFrame(cx);
+ if (!getFrame(cx, iter, &scriptFrame)) {
+ return false;
+ }
+
+ RootedValue fval(cx, ObjectValue(*hook));
+ RootedValue rv(cx);
+ bool ok = js::Call(cx, fval, object, scriptFrame, &rv);
+ return processHandlerResult(cx, ok, rv, iter.abstractFramePtr(), iter.pc(),
+ resumeMode, vp);
+}
+
+bool Debugger::fireExceptionUnwind(JSContext* cx, HandleValue exc,
+ ResumeMode& resumeMode,
+ MutableHandleValue vp) {
+ RootedObject hook(cx, getHook(OnExceptionUnwind));
+ MOZ_ASSERT(hook);
+ MOZ_ASSERT(hook->isCallable());
+
+ RootedValue scriptFrame(cx);
+ RootedValue wrappedExc(cx, exc);
+
+ FrameIter iter(cx);
+ if (!getFrame(cx, iter, &scriptFrame) ||
+ !wrapDebuggeeValue(cx, &wrappedExc)) {
+ return false;
+ }
+
+ RootedValue fval(cx, ObjectValue(*hook));
+ RootedValue rv(cx);
+ bool ok = js::Call(cx, fval, object, scriptFrame, wrappedExc, &rv);
+ return processHandlerResult(cx, ok, rv, iter.abstractFramePtr(), iter.pc(),
+ resumeMode, vp);
+}
+
+bool Debugger::fireEnterFrame(JSContext* cx, ResumeMode& resumeMode,
+ MutableHandleValue vp) {
+ RootedObject hook(cx, getHook(OnEnterFrame));
+ MOZ_ASSERT(hook);
+ MOZ_ASSERT(hook->isCallable());
+
+ RootedValue scriptFrame(cx);
+
+ FrameIter iter(cx);
+
+#if DEBUG
+ // Assert that the hook won't be able to re-enter the generator.
+ if (iter.hasScript() && JSOp(*iter.pc()) == JSOp::AfterYield) {
+ AutoRealm ar(cx, iter.script());
+ auto* genObj = GetGeneratorObjectForFrame(cx, iter.abstractFramePtr());
+ MOZ_ASSERT(genObj->isRunning());
+ }
+#endif
+
+ if (!getFrame(cx, iter, &scriptFrame)) {
+ return false;
+ }
+
+ RootedValue fval(cx, ObjectValue(*hook));
+ RootedValue rv(cx);
+ bool ok = js::Call(cx, fval, object, scriptFrame, &rv);
+
+ return processHandlerResult(cx, ok, rv, iter.abstractFramePtr(), iter.pc(),
+ resumeMode, vp);
+}
+
+bool Debugger::fireNativeCall(JSContext* cx, const CallArgs& args,
+ CallReason reason, ResumeMode& resumeMode,
+ MutableHandleValue vp) {
+ RootedObject hook(cx, getHook(OnNativeCall));
+ MOZ_ASSERT(hook);
+ MOZ_ASSERT(hook->isCallable());
+
+ RootedValue fval(cx, ObjectValue(*hook));
+ RootedValue calleeval(cx, args.calleev());
+ if (!wrapDebuggeeValue(cx, &calleeval)) {
+ return false;
+ }
+
+ JSAtom* reasonAtom = nullptr;
+ switch (reason) {
+ case CallReason::Call:
+ reasonAtom = cx->names().call;
+ break;
+ case CallReason::CallContent:
+ reasonAtom = cx->names().call;
+ break;
+ case CallReason::FunCall:
+ reasonAtom = cx->names().call;
+ break;
+ case CallReason::Getter:
+ reasonAtom = cx->names().get;
+ break;
+ case CallReason::Setter:
+ reasonAtom = cx->names().set;
+ break;
+ }
+ MOZ_ASSERT(AtomIsMarked(cx->zone(), reasonAtom));
+
+ RootedValue reasonval(cx, StringValue(reasonAtom));
+
+ RootedValue rv(cx);
+ bool ok = js::Call(cx, fval, object, calleeval, reasonval, &rv);
+
+ return processHandlerResult(cx, ok, rv, NullFramePtr(), nullptr, resumeMode,
+ vp);
+}
+
+bool Debugger::fireNewScript(JSContext* cx,
+ Handle<DebuggerScriptReferent> scriptReferent) {
+ RootedObject hook(cx, getHook(OnNewScript));
+ MOZ_ASSERT(hook);
+ MOZ_ASSERT(hook->isCallable());
+
+ JSObject* dsobj = wrapVariantReferent(cx, scriptReferent);
+ if (!dsobj) {
+ return false;
+ }
+
+ RootedValue fval(cx, ObjectValue(*hook));
+ RootedValue dsval(cx, ObjectValue(*dsobj));
+ RootedValue rv(cx);
+ return js::Call(cx, fval, object, dsval, &rv) || handleUncaughtException(cx);
+}
+
+bool Debugger::fireOnGarbageCollectionHook(
+ JSContext* cx, const JS::dbg::GarbageCollectionEvent::Ptr& gcData) {
+ MOZ_ASSERT(observedGC(gcData->majorGCNumber()));
+ observedGCs.remove(gcData->majorGCNumber());
+
+ RootedObject hook(cx, getHook(OnGarbageCollection));
+ MOZ_ASSERT(hook);
+ MOZ_ASSERT(hook->isCallable());
+
+ JSObject* dataObj = gcData->toJSObject(cx);
+ if (!dataObj) {
+ return false;
+ }
+
+ RootedValue fval(cx, ObjectValue(*hook));
+ RootedValue dataVal(cx, ObjectValue(*dataObj));
+ RootedValue rv(cx);
+ return js::Call(cx, fval, object, dataVal, &rv) ||
+ handleUncaughtException(cx);
+}
+
+template <typename HookIsEnabledFun /* bool (Debugger*) */,
+ typename FireHookFun /* bool (Debugger*) */>
+/* static */
+void Debugger::dispatchQuietHook(JSContext* cx, HookIsEnabledFun hookIsEnabled,
+ FireHookFun fireHook) {
+ DebuggerList<HookIsEnabledFun> debuggerList(cx, hookIsEnabled);
+
+ if (!debuggerList.init(cx)) {
+ // init may fail due to OOM. This OOM is not handlable at the
+ // callsites of dispatchQuietHook in the engine.
+ cx->clearPendingException();
+ return;
+ }
+
+ debuggerList.dispatchQuietHook(cx, fireHook);
+}
+
+template <typename HookIsEnabledFun /* bool (Debugger*) */, typename FireHookFun /* bool (Debugger*, ResumeMode&, MutableHandleValue vp) */>
+/* static */
+bool Debugger::dispatchResumptionHook(JSContext* cx, AbstractFramePtr frame,
+ HookIsEnabledFun hookIsEnabled,
+ FireHookFun fireHook) {
+ DebuggerList<HookIsEnabledFun> debuggerList(cx, hookIsEnabled);
+
+ if (!debuggerList.init(cx)) {
+ return false;
+ }
+
+ return debuggerList.dispatchResumptionHook(cx, frame, fireHook);
+}
+
+// Maximum length for source URLs that can be remembered.
+static const size_t SourceURLMaxLength = 1024;
+
+// Maximum number of source URLs that can be remembered in a realm.
+static const size_t SourceURLRealmLimit = 100;
+
+static bool RememberSourceURL(JSContext* cx, HandleScript script) {
+ cx->check(script);
+
+ // Sources introduced dynamically are not remembered.
+ if (script->sourceObject()->unwrappedIntroductionScript()) {
+ return true;
+ }
+
+ const char* filename = script->filename();
+ if (!filename ||
+ strnlen(filename, SourceURLMaxLength + 1) > SourceURLMaxLength) {
+ return true;
+ }
+
+ Rooted<ArrayObject*> holder(cx, script->global().getSourceURLsHolder());
+ if (!holder) {
+ holder = NewDenseEmptyArray(cx);
+ if (!holder) {
+ return false;
+ }
+ script->global().setSourceURLsHolder(holder);
+ }
+
+ if (holder->length() >= SourceURLRealmLimit) {
+ return true;
+ }
+
+ RootedString filenameString(cx,
+ AtomizeUTF8Chars(cx, filename, strlen(filename)));
+ if (!filenameString) {
+ return false;
+ }
+
+ // The source URLs holder never escapes to script, so we can treat it as a
+ // newborn array for the purpose of adding elements.
+ return NewbornArrayPush(cx, holder, StringValue(filenameString));
+}
+
+void DebugAPI::onNewScript(JSContext* cx, HandleScript script) {
+ if (!script->realm()->isDebuggee()) {
+ // Remember the URLs associated with scripts in non-system realms,
+ // in case the debugger is attached later.
+ if (!script->realm()->isSystem()) {
+ if (!RememberSourceURL(cx, script)) {
+ cx->clearPendingException();
+ }
+ }
+ return;
+ }
+
+ Debugger::dispatchQuietHook(
+ cx,
+ [script](Debugger* dbg) -> bool {
+ return dbg->observesNewScript() && dbg->observesScript(script);
+ },
+ [&](Debugger* dbg) -> bool {
+ BaseScript* base = script.get();
+ Rooted<DebuggerScriptReferent> scriptReferent(cx, base);
+ return dbg->fireNewScript(cx, scriptReferent);
+ });
+}
+
+void DebugAPI::slowPathOnNewWasmInstance(
+ JSContext* cx, Handle<WasmInstanceObject*> wasmInstance) {
+ Debugger::dispatchQuietHook(
+ cx,
+ [wasmInstance](Debugger* dbg) -> bool {
+ return dbg->observesNewScript() &&
+ dbg->observesGlobal(&wasmInstance->global());
+ },
+ [&](Debugger* dbg) -> bool {
+ Rooted<DebuggerScriptReferent> scriptReferent(cx, wasmInstance.get());
+ return dbg->fireNewScript(cx, scriptReferent);
+ });
+}
+
+/* static */
+bool DebugAPI::onTrap(JSContext* cx) {
+ FrameIter iter(cx);
+ JS::AutoSaveExceptionState savedExc(cx);
+ Rooted<GlobalObject*> global(cx);
+ BreakpointSite* site;
+ bool isJS; // true when iter.hasScript(), false when iter.isWasm()
+ jsbytecode* pc; // valid when isJS == true
+ uint32_t bytecodeOffset; // valid when isJS == false
+ if (iter.hasScript()) {
+ RootedScript script(cx, iter.script());
+ MOZ_ASSERT(script->isDebuggee());
+ global.set(&script->global());
+ isJS = true;
+ pc = iter.pc();
+ bytecodeOffset = 0;
+ site = DebugScript::getBreakpointSite(script, pc);
+ } else {
+ MOZ_ASSERT(iter.isWasm());
+ global.set(&iter.wasmInstance()->object()->global());
+ isJS = false;
+ pc = nullptr;
+ bytecodeOffset = iter.wasmBytecodeOffset();
+ site = iter.wasmInstance()->debug().getBreakpointSite(bytecodeOffset);
+ }
+
+ // Build list of breakpoint handlers.
+ //
+ // This does not need to be rooted: since the JSScript/WasmInstance is on the
+ // stack, the Breakpoints will not be GC'd. However, they may be deleted, and
+ // we check for that case below.
+ Vector<Breakpoint*> triggered(cx);
+ for (Breakpoint* bp = site->firstBreakpoint(); bp; bp = bp->nextInSite()) {
+ if (!triggered.append(bp)) {
+ return false;
+ }
+ }
+
+ ResumeMode resumeMode = ResumeMode::Continue;
+ RootedValue rval(cx);
+
+ if (triggered.length() > 0) {
+ // Preserve the debuggee's microtask event queue while we run the hooks, so
+ // the debugger's microtask checkpoints don't run from the debuggee's
+ // microtasks, and vice versa.
+ JS::AutoDebuggerJobQueueInterruption adjqi;
+ if (!adjqi.init(cx)) {
+ return false;
+ }
+
+ for (Breakpoint* bp : triggered) {
+ // Handlers can clear breakpoints. Check that bp still exists.
+ if (!site || !site->hasBreakpoint(bp)) {
+ continue;
+ }
+
+ // There are two reasons we have to check whether dbg is debugging
+ // global.
+ //
+ // One is just that one breakpoint handler can disable other Debuggers
+ // or remove debuggees.
+ //
+ // The other has to do with non-compile-and-go scripts, which have no
+ // specific global--until they are executed. Only now do we know which
+ // global the script is running against.
+ Debugger* dbg = bp->debugger;
+ if (dbg->debuggees.has(global)) {
+ EnterDebuggeeNoExecute nx(cx, *dbg, adjqi);
+
+ bool result = dbg->enterDebuggerHook(cx, [&]() -> bool {
+ RootedValue scriptFrame(cx);
+ if (!dbg->getFrame(cx, iter, &scriptFrame)) {
+ return false;
+ }
+
+ // Re-wrap the breakpoint's handler for the Debugger's compartment.
+ // When the handler and the Debugger are in the same compartment (the
+ // usual case), this actually unwraps it, but there's no requirement
+ // that they be in the same compartment, so we can't be sure.
+ Rooted<JSObject*> handler(cx, bp->handler);
+ if (!cx->compartment()->wrap(cx, &handler)) {
+ return false;
+ }
+
+ RootedValue rv(cx);
+ bool ok = CallMethodIfPresent(cx, handler, "hit", 1,
+ scriptFrame.address(), &rv);
+
+ return dbg->processHandlerResult(cx, ok, rv, iter.abstractFramePtr(),
+ iter.pc(), resumeMode, &rval);
+ });
+ adjqi.runJobs();
+
+ if (!result) {
+ return false;
+ }
+
+ // Calling JS code invalidates site. Reload it.
+ if (isJS) {
+ site = DebugScript::getBreakpointSite(iter.script(), pc);
+ } else {
+ site = iter.wasmInstance()->debug().getBreakpointSite(bytecodeOffset);
+ }
+ }
+ }
+ }
+
+ if (!ApplyFrameResumeMode(cx, iter.abstractFramePtr(), resumeMode, rval)) {
+ savedExc.drop();
+ return false;
+ }
+ return true;
+}
+
+/* static */
+bool DebugAPI::onSingleStep(JSContext* cx) {
+ FrameIter iter(cx);
+
+ // We may be stepping over a JSOp::Exception, that pushes the context's
+ // pending exception for a 'catch' clause to handle. Don't let the onStep
+ // handlers mess with that (other than by returning a resumption value).
+ JS::AutoSaveExceptionState savedExc(cx);
+
+ // Build list of Debugger.Frame instances referring to this frame with
+ // onStep handlers.
+ Rooted<Debugger::DebuggerFrameVector> frames(cx);
+ if (!Debugger::getDebuggerFrames(iter.abstractFramePtr(), &frames)) {
+ ReportOutOfMemory(cx);
+ return false;
+ }
+
+#ifdef DEBUG
+ // Validate the single-step count on this frame's script, to ensure that
+ // we're not receiving traps we didn't ask for. Even when frames is
+ // non-empty (and thus we know this trap was requested), do the check
+ // anyway, to make sure the count has the correct non-zero value.
+ //
+ // The converse --- ensuring that we do receive traps when we should --- can
+ // be done with unit tests.
+ if (iter.hasScript()) {
+ uint32_t liveStepperCount = 0;
+ uint32_t suspendedStepperCount = 0;
+ JSScript* trappingScript = iter.script();
+ JS::AutoAssertNoGC nogc;
+ for (Realm::DebuggerVectorEntry& entry : cx->global()->getDebuggers(nogc)) {
+ Debugger* dbg = entry.dbg;
+ for (Debugger::FrameMap::Range r = dbg->frames.all(); !r.empty();
+ r.popFront()) {
+ AbstractFramePtr frame = r.front().key();
+ NativeObject* frameobj = r.front().value();
+ if (frame.isWasmDebugFrame()) {
+ continue;
+ }
+ if (frame.script() == trappingScript &&
+ !frameobj->getReservedSlot(DebuggerFrame::ONSTEP_HANDLER_SLOT)
+ .isUndefined()) {
+ liveStepperCount++;
+ }
+ }
+
+ // Also count hooks set on suspended generator frames.
+ for (Debugger::GeneratorWeakMap::Range r = dbg->generatorFrames.all();
+ !r.empty(); r.popFront()) {
+ AbstractGeneratorObject& genObj = *r.front().key();
+ DebuggerFrame& frameObj = *r.front().value();
+ MOZ_ASSERT(&frameObj.unwrappedGenerator() == &genObj);
+
+ // Live Debugger.Frames were already counted in dbg->frames loop.
+ if (frameObj.isOnStack()) {
+ continue;
+ }
+
+ // A closed generator no longer has a callee so it will not be able to
+ // compare with the trappingScript.
+ if (genObj.isClosed()) {
+ continue;
+ }
+
+ // If a frame isn't live, but it has an entry in generatorFrames,
+ // it had better be suspended.
+ MOZ_ASSERT(genObj.isSuspended());
+
+ if (genObj.callee().hasBaseScript() &&
+ genObj.callee().baseScript() == trappingScript &&
+ !frameObj.getReservedSlot(DebuggerFrame::ONSTEP_HANDLER_SLOT)
+ .isUndefined()) {
+ suspendedStepperCount++;
+ }
+ }
+ }
+
+ MOZ_ASSERT(liveStepperCount + suspendedStepperCount ==
+ DebugScript::getStepperCount(trappingScript));
+ }
+#endif
+
+ RootedValue rval(cx);
+ ResumeMode resumeMode = ResumeMode::Continue;
+
+ if (frames.length() > 0) {
+ // Preserve the debuggee's microtask event queue while we run the hooks, so
+ // the debugger's microtask checkpoints don't run from the debuggee's
+ // microtasks, and vice versa.
+ JS::AutoDebuggerJobQueueInterruption adjqi;
+ if (!adjqi.init(cx)) {
+ return false;
+ }
+
+ // Call onStep for frames that have the handler set.
+ for (size_t i = 0; i < frames.length(); i++) {
+ Handle<DebuggerFrame*> frame = frames[i];
+ OnStepHandler* handler = frame->onStepHandler();
+ if (!handler) {
+ continue;
+ }
+
+ Debugger* dbg = frame->owner();
+ EnterDebuggeeNoExecute nx(cx, *dbg, adjqi);
+
+ bool result = dbg->enterDebuggerHook(cx, [&]() -> bool {
+ ResumeMode nextResumeMode = ResumeMode::Continue;
+ RootedValue nextValue(cx);
+
+ bool success = handler->onStep(cx, frame, nextResumeMode, &nextValue);
+ return dbg->processParsedHandlerResult(
+ cx, iter.abstractFramePtr(), iter.pc(), success, nextResumeMode,
+ nextValue, resumeMode, &rval);
+ });
+ adjqi.runJobs();
+
+ if (!result) {
+ return false;
+ }
+ }
+ }
+
+ if (!ApplyFrameResumeMode(cx, iter.abstractFramePtr(), resumeMode, rval)) {
+ savedExc.drop();
+ return false;
+ }
+ return true;
+}
+
+bool Debugger::fireNewGlobalObject(JSContext* cx,
+ Handle<GlobalObject*> global) {
+ RootedObject hook(cx, getHook(OnNewGlobalObject));
+ MOZ_ASSERT(hook);
+ MOZ_ASSERT(hook->isCallable());
+
+ RootedValue wrappedGlobal(cx, ObjectValue(*global));
+ if (!wrapDebuggeeValue(cx, &wrappedGlobal)) {
+ return false;
+ }
+
+ // onNewGlobalObject is infallible, and thus is only allowed to return
+ // undefined as a resumption value. If it returns anything else, we throw.
+ // And if that happens, or if the hook itself throws, we invoke the
+ // uncaughtExceptionHook so that we never leave an exception pending on the
+ // cx. This allows JS_NewGlobalObject to avoid handling failures from
+ // debugger hooks.
+ RootedValue rv(cx);
+ RootedValue fval(cx, ObjectValue(*hook));
+ bool ok = js::Call(cx, fval, object, wrappedGlobal, &rv);
+ if (ok && !rv.isUndefined()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_DEBUG_RESUMPTION_VALUE_DISALLOWED);
+ ok = false;
+ }
+
+ return ok || handleUncaughtException(cx);
+}
+
+void DebugAPI::slowPathOnNewGlobalObject(JSContext* cx,
+ Handle<GlobalObject*> global) {
+ MOZ_ASSERT(!cx->runtime()->onNewGlobalObjectWatchers().isEmpty());
+ if (global->realm()->creationOptions().invisibleToDebugger()) {
+ return;
+ }
+
+ // Make a copy of the runtime's onNewGlobalObjectWatchers before running the
+ // handlers. Since one Debugger's handler can disable another's, the list
+ // can be mutated while we're walking it.
+ RootedObjectVector watchers(cx);
+ for (auto& dbg : cx->runtime()->onNewGlobalObjectWatchers()) {
+ MOZ_ASSERT(dbg.observesNewGlobalObject());
+ JSObject* obj = dbg.object;
+ JS::ExposeObjectToActiveJS(obj);
+ if (!watchers.append(obj)) {
+ if (cx->isExceptionPending()) {
+ cx->clearPendingException();
+ }
+ return;
+ }
+ }
+
+ // Preserve the debuggee's microtask event queue while we run the hooks, so
+ // the debugger's microtask checkpoints don't run from the debuggee's
+ // microtasks, and vice versa.
+ JS::AutoDebuggerJobQueueInterruption adjqi;
+ if (!adjqi.init(cx)) {
+ cx->clearPendingException();
+ return;
+ }
+
+ for (size_t i = 0; i < watchers.length(); i++) {
+ Debugger* dbg = Debugger::fromJSObject(watchers[i]);
+ EnterDebuggeeNoExecute nx(cx, *dbg, adjqi);
+
+ if (dbg->observesNewGlobalObject()) {
+ bool result = dbg->enterDebuggerHook(
+ cx, [&]() -> bool { return dbg->fireNewGlobalObject(cx, global); });
+ adjqi.runJobs();
+
+ if (!result) {
+ // Like other quiet hooks using dispatchQuietHook, this hook
+ // silently ignores all errors that propagate out of it and aren't
+ // already handled by the hook error reporting.
+ cx->clearPendingException();
+ break;
+ }
+ }
+ }
+ MOZ_ASSERT(!cx->isExceptionPending());
+}
+
+/* static */
+void DebugAPI::slowPathNotifyParticipatesInGC(uint64_t majorGCNumber,
+ Realm::DebuggerVector& dbgs,
+ const JS::AutoRequireNoGC& nogc) {
+ for (Realm::DebuggerVector::Range r = dbgs.all(); !r.empty(); r.popFront()) {
+ if (!r.front().dbg.unbarrieredGet()->debuggeeIsBeingCollected(
+ majorGCNumber)) {
+#ifdef DEBUG
+ fprintf(stderr,
+ "OOM while notifying observing Debuggers of a GC: The "
+ "onGarbageCollection\n"
+ "hook will not be fired for this GC for some Debuggers!\n");
+#endif
+ return;
+ }
+ }
+}
+
+/* static */
+Maybe<double> DebugAPI::allocationSamplingProbability(GlobalObject* global) {
+ JS::AutoAssertNoGC nogc;
+ Realm::DebuggerVector& dbgs = global->getDebuggers(nogc);
+ if (dbgs.empty()) {
+ return Nothing();
+ }
+
+ DebugOnly<Realm::DebuggerVectorEntry*> begin = dbgs.begin();
+
+ double probability = 0;
+ bool foundAnyDebuggers = false;
+ for (auto p = dbgs.begin(); p < dbgs.end(); p++) {
+ // The set of debuggers had better not change while we're iterating,
+ // such that the vector gets reallocated.
+ MOZ_ASSERT(dbgs.begin() == begin);
+ // Use unbarrieredGet() to prevent triggering read barrier while collecting,
+ // this is safe as long as dbgp does not escape.
+ Debugger* dbgp = p->dbg.unbarrieredGet();
+
+ if (dbgp->trackingAllocationSites) {
+ foundAnyDebuggers = true;
+ probability = std::max(dbgp->allocationSamplingProbability, probability);
+ }
+ }
+
+ return foundAnyDebuggers ? Some(probability) : Nothing();
+}
+
+/* static */
+bool DebugAPI::slowPathOnLogAllocationSite(JSContext* cx, HandleObject obj,
+ Handle<SavedFrame*> frame,
+ mozilla::TimeStamp when,
+ Realm::DebuggerVector& dbgs,
+ const gc::AutoSuppressGC& nogc) {
+ MOZ_ASSERT(!dbgs.empty());
+ mozilla::DebugOnly<Realm::DebuggerVectorEntry*> begin = dbgs.begin();
+
+ // GC is suppressed so we can iterate over the debuggers; appendAllocationSite
+ // calls Compartment::wrap, and thus could GC.
+
+ for (auto p = dbgs.begin(); p < dbgs.end(); p++) {
+ // The set of debuggers had better not change while we're iterating,
+ // such that the vector gets reallocated.
+ MOZ_ASSERT(dbgs.begin() == begin);
+
+ if (p->dbg->trackingAllocationSites &&
+ !p->dbg->appendAllocationSite(cx, obj, frame, when)) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+bool Debugger::isDebuggeeUnbarriered(const Realm* realm) const {
+ MOZ_ASSERT(realm);
+ return realm->isDebuggee() &&
+ debuggees.has(realm->unsafeUnbarrieredMaybeGlobal());
+}
+
+bool Debugger::appendAllocationSite(JSContext* cx, HandleObject obj,
+ Handle<SavedFrame*> frame,
+ mozilla::TimeStamp when) {
+ MOZ_ASSERT(trackingAllocationSites);
+
+ AutoRealm ar(cx, object);
+ RootedObject wrappedFrame(cx, frame);
+ if (!cx->compartment()->wrap(cx, &wrappedFrame)) {
+ return false;
+ }
+
+ auto className = obj->getClass()->name;
+ auto size =
+ JS::ubi::Node(obj.get()).size(cx->runtime()->debuggerMallocSizeOf);
+ auto inNursery = gc::IsInsideNursery(obj);
+
+ if (!allocationsLog.emplaceBack(wrappedFrame, when, className, size,
+ inNursery)) {
+ ReportOutOfMemory(cx);
+ return false;
+ }
+
+ if (allocationsLog.length() > maxAllocationsLogLength) {
+ allocationsLog.popFront();
+ MOZ_ASSERT(allocationsLog.length() == maxAllocationsLogLength);
+ allocationsLogOverflowed = true;
+ }
+
+ return true;
+}
+
+bool Debugger::firePromiseHook(JSContext* cx, Hook hook, HandleObject promise) {
+ MOZ_ASSERT(hook == OnNewPromise || hook == OnPromiseSettled);
+
+ RootedObject hookObj(cx, getHook(hook));
+ MOZ_ASSERT(hookObj);
+ MOZ_ASSERT(hookObj->isCallable());
+
+ RootedValue dbgObj(cx, ObjectValue(*promise));
+ if (!wrapDebuggeeValue(cx, &dbgObj)) {
+ return false;
+ }
+
+ // Like onNewGlobalObject, the Promise hooks are infallible and the comments
+ // in |Debugger::fireNewGlobalObject| apply here as well.
+ RootedValue fval(cx, ObjectValue(*hookObj));
+ RootedValue rv(cx);
+ bool ok = js::Call(cx, fval, object, dbgObj, &rv);
+ if (ok && !rv.isUndefined()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_DEBUG_RESUMPTION_VALUE_DISALLOWED);
+ ok = false;
+ }
+
+ return ok || handleUncaughtException(cx);
+}
+
+/* static */
+void Debugger::slowPathPromiseHook(JSContext* cx, Hook hook,
+ Handle<PromiseObject*> promise) {
+ MOZ_ASSERT(hook == OnNewPromise || hook == OnPromiseSettled);
+
+ if (hook == OnPromiseSettled) {
+ // We should be in the right compartment, but for simplicity always enter
+ // the promise's realm below.
+ cx->check(promise);
+ }
+
+ AutoRealm ar(cx, promise);
+
+ Debugger::dispatchQuietHook(
+ cx, [hook](Debugger* dbg) -> bool { return dbg->getHook(hook); },
+ [&](Debugger* dbg) -> bool {
+ return dbg->firePromiseHook(cx, hook, promise);
+ });
+}
+
+/* static */
+void DebugAPI::slowPathOnNewPromise(JSContext* cx,
+ Handle<PromiseObject*> promise) {
+ Debugger::slowPathPromiseHook(cx, Debugger::OnNewPromise, promise);
+}
+
+/* static */
+void DebugAPI::slowPathOnPromiseSettled(JSContext* cx,
+ Handle<PromiseObject*> promise) {
+ Debugger::slowPathPromiseHook(cx, Debugger::OnPromiseSettled, promise);
+}
+
+/*** Debugger code invalidation for observing execution *********************/
+
+class MOZ_RAII ExecutionObservableRealms
+ : public DebugAPI::ExecutionObservableSet {
+ HashSet<Realm*> realms_;
+ HashSet<Zone*> zones_;
+
+ public:
+ explicit ExecutionObservableRealms(JSContext* cx) : realms_(cx), zones_(cx) {}
+
+ bool add(Realm* realm) {
+ return realms_.put(realm) && zones_.put(realm->zone());
+ }
+
+ using RealmRange = HashSet<Realm*>::Range;
+ const HashSet<Realm*>* realms() const { return &realms_; }
+
+ const HashSet<Zone*>* zones() const override { return &zones_; }
+ bool shouldRecompileOrInvalidate(JSScript* script) const override {
+ return script->hasBaselineScript() && realms_.has(script->realm());
+ }
+ bool shouldMarkAsDebuggee(FrameIter& iter) const override {
+ // AbstractFramePtr can't refer to non-remateralized Ion frames or
+ // non-debuggee wasm frames, so if iter refers to one such, we know we
+ // don't match.
+ return iter.hasUsableAbstractFramePtr() && realms_.has(iter.realm());
+ }
+};
+
+// Given a particular AbstractFramePtr F that has become observable, this
+// represents the stack frames that need to be bailed out or marked as
+// debuggees, and the scripts that need to be recompiled, taking inlining into
+// account.
+class MOZ_RAII ExecutionObservableFrame
+ : public DebugAPI::ExecutionObservableSet {
+ AbstractFramePtr frame_;
+
+ public:
+ explicit ExecutionObservableFrame(AbstractFramePtr frame) : frame_(frame) {}
+
+ Zone* singleZone() const override {
+ // We never inline across realms, let alone across zones, so
+ // frames_'s script's zone is the only one of interest.
+ return frame_.script()->zone();
+ }
+
+ JSScript* singleScriptForZoneInvalidation() const override {
+ MOZ_CRASH(
+ "ExecutionObservableFrame shouldn't need zone-wide invalidation.");
+ return nullptr;
+ }
+
+ bool shouldRecompileOrInvalidate(JSScript* script) const override {
+ // Normally, *this represents exactly one script: the one frame_ is
+ // running.
+ //
+ // However, debug-mode OSR uses *this for both invalidating Ion frames,
+ // and recompiling the Baseline scripts that those Ion frames will bail
+ // out into. Suppose frame_ is an inline frame, executing a copy of its
+ // JSScript, S_inner, that has been inlined into the IonScript of some
+ // other JSScript, S_outer. We must match S_outer, to decide which Ion
+ // frame to invalidate; and we must match S_inner, to decide which
+ // Baseline script to recompile.
+ //
+ // Note that this does not, by design, invalidate *all* inliners of
+ // frame_.script(), as only frame_ is made observable, not
+ // frame_.script().
+ if (!script->hasBaselineScript()) {
+ return false;
+ }
+
+ if (frame_.hasScript() && script == frame_.script()) {
+ return true;
+ }
+
+ return frame_.isRematerializedFrame() &&
+ script == frame_.asRematerializedFrame()->outerScript();
+ }
+
+ bool shouldMarkAsDebuggee(FrameIter& iter) const override {
+ // AbstractFramePtr can't refer to non-remateralized Ion frames or
+ // non-debuggee wasm frames, so if iter refers to one such, we know we
+ // don't match.
+ //
+ // We never use this 'has' overload for frame invalidation, only for
+ // frame debuggee marking; so this overload doesn't need a parallel to
+ // the just-so inlining logic above.
+ return iter.hasUsableAbstractFramePtr() &&
+ iter.abstractFramePtr() == frame_;
+ }
+};
+
+class MOZ_RAII ExecutionObservableScript
+ : public DebugAPI::ExecutionObservableSet {
+ RootedScript script_;
+
+ public:
+ ExecutionObservableScript(JSContext* cx, JSScript* script)
+ : script_(cx, script) {}
+
+ Zone* singleZone() const override { return script_->zone(); }
+ JSScript* singleScriptForZoneInvalidation() const override { return script_; }
+ bool shouldRecompileOrInvalidate(JSScript* script) const override {
+ return script->hasBaselineScript() && script == script_;
+ }
+ bool shouldMarkAsDebuggee(FrameIter& iter) const override {
+ // AbstractFramePtr can't refer to non-remateralized Ion frames, and
+ // while a non-rematerialized Ion frame may indeed be running script_,
+ // we cannot mark them as debuggees until they bail out.
+ //
+ // Upon bailing out, any newly constructed Baseline frames that came
+ // from Ion frames with scripts that are isDebuggee() is marked as
+ // debuggee. This is correct in that the only other way a frame may be
+ // marked as debuggee is via Debugger.Frame reflection, which would
+ // have rematerialized any Ion frames.
+ //
+ // Also AbstractFramePtr can't refer to non-debuggee wasm frames, so if
+ // iter refers to one such, we know we don't match.
+ return iter.hasUsableAbstractFramePtr() && !iter.isWasm() &&
+ iter.abstractFramePtr().script() == script_;
+ }
+};
+
+/* static */
+bool Debugger::updateExecutionObservabilityOfFrames(
+ JSContext* cx, const DebugAPI::ExecutionObservableSet& obs,
+ IsObserving observing) {
+ AutoSuppressProfilerSampling suppressProfilerSampling(cx);
+
+ if (!jit::RecompileOnStackBaselineScriptsForDebugMode(cx, obs, observing)) {
+ return false;
+ }
+
+ AbstractFramePtr oldestEnabledFrame;
+ for (AllFramesIter iter(cx); !iter.done(); ++iter) {
+ if (obs.shouldMarkAsDebuggee(iter)) {
+ if (observing) {
+ if (!iter.abstractFramePtr().isDebuggee()) {
+ oldestEnabledFrame = iter.abstractFramePtr();
+ oldestEnabledFrame.setIsDebuggee();
+ }
+ if (iter.abstractFramePtr().isWasmDebugFrame()) {
+ iter.abstractFramePtr().asWasmDebugFrame()->observe(cx);
+ }
+ } else {
+#ifdef DEBUG
+ // Debugger.Frame lifetimes are managed by the debug epilogue,
+ // so in general it's unsafe to unmark a frame if it has a
+ // Debugger.Frame associated with it.
+ MOZ_ASSERT(!DebugAPI::inFrameMaps(iter.abstractFramePtr()));
+#endif
+ iter.abstractFramePtr().unsetIsDebuggee();
+ }
+ }
+ }
+
+ // See comment in unsetPrevUpToDateUntil.
+ if (oldestEnabledFrame) {
+ AutoRealm ar(cx, oldestEnabledFrame.environmentChain());
+ DebugEnvironments::unsetPrevUpToDateUntil(cx, oldestEnabledFrame);
+ }
+
+ return true;
+}
+
+static inline void MarkJitScriptActiveIfObservable(
+ JSScript* script, const DebugAPI::ExecutionObservableSet& obs) {
+ if (obs.shouldRecompileOrInvalidate(script)) {
+ script->jitScript()->setActive();
+ }
+}
+
+static bool AppendAndInvalidateScript(JSContext* cx, Zone* zone,
+ JSScript* script,
+ jit::RecompileInfoVector& invalid,
+ Vector<JSScript*>& scripts) {
+ // Enter the script's realm as AddPendingInvalidation attempts to
+ // cancel off-thread compilations, whose books are kept on the
+ // script's realm.
+ MOZ_ASSERT(script->zone() == zone);
+ AutoRealm ar(cx, script);
+ AddPendingInvalidation(invalid, script);
+ return scripts.append(script);
+}
+
+static bool UpdateExecutionObservabilityOfScriptsInZone(
+ JSContext* cx, Zone* zone, const DebugAPI::ExecutionObservableSet& obs,
+ Debugger::IsObserving observing) {
+ using namespace js::jit;
+
+ AutoSuppressProfilerSampling suppressProfilerSampling(cx);
+
+ JS::GCContext* gcx = cx->gcContext();
+
+ Vector<JSScript*> scripts(cx);
+
+ // Iterate through observable scripts, invalidating their Ion scripts and
+ // appending them to a vector for discarding their baseline scripts later.
+ {
+ RecompileInfoVector invalid;
+ if (JSScript* script = obs.singleScriptForZoneInvalidation()) {
+ if (obs.shouldRecompileOrInvalidate(script)) {
+ if (!AppendAndInvalidateScript(cx, zone, script, invalid, scripts)) {
+ return false;
+ }
+ }
+ } else {
+ for (auto base = zone->cellIter<BaseScript>(); !base.done();
+ base.next()) {
+ if (!base->hasJitScript()) {
+ continue;
+ }
+ JSScript* script = base->asJSScript();
+ if (obs.shouldRecompileOrInvalidate(script)) {
+ if (!AppendAndInvalidateScript(cx, zone, script, invalid, scripts)) {
+ return false;
+ }
+ }
+ }
+ }
+ Invalidate(cx, invalid);
+ }
+
+ // Code below this point must be infallible to ensure the active bit of
+ // BaselineScripts is in a consistent state.
+ //
+ // Mark active baseline scripts in the observable set so that they don't
+ // get discarded. They will be recompiled.
+ for (JitActivationIterator actIter(cx); !actIter.done(); ++actIter) {
+ if (actIter->compartment()->zone() != zone) {
+ continue;
+ }
+
+ for (OnlyJSJitFrameIter iter(actIter); !iter.done(); ++iter) {
+ const JSJitFrameIter& frame = iter.frame();
+ switch (frame.type()) {
+ case FrameType::BaselineJS:
+ MarkJitScriptActiveIfObservable(frame.script(), obs);
+ break;
+ case FrameType::IonJS:
+ MarkJitScriptActiveIfObservable(frame.script(), obs);
+ for (InlineFrameIterator inlineIter(cx, &frame); inlineIter.more();
+ ++inlineIter) {
+ MarkJitScriptActiveIfObservable(inlineIter.script(), obs);
+ }
+ break;
+ default:;
+ }
+ }
+ }
+
+ // Iterate through the scripts again and finish discarding
+ // BaselineScripts. This must be done as a separate phase as we can only
+ // discard the BaselineScript on scripts that have no IonScript.
+ for (size_t i = 0; i < scripts.length(); i++) {
+ MOZ_ASSERT_IF(scripts[i]->isDebuggee(), observing);
+ if (!scripts[i]->jitScript()->active()) {
+ FinishDiscardBaselineScript(gcx, scripts[i]);
+ }
+ scripts[i]->jitScript()->resetActive();
+ }
+
+ // Iterate through all wasm instances to find ones that need to be updated.
+ for (RealmsInZoneIter r(zone); !r.done(); r.next()) {
+ for (wasm::Instance* instance : r->wasm.instances()) {
+ if (!instance->debugEnabled()) {
+ continue;
+ }
+
+ bool enableTrap = observing == Debugger::Observing;
+ instance->debug().ensureEnterFrameTrapsState(cx, instance, enableTrap);
+ }
+ }
+
+ return true;
+}
+
+/* static */
+bool Debugger::updateExecutionObservabilityOfScripts(
+ JSContext* cx, const DebugAPI::ExecutionObservableSet& obs,
+ IsObserving observing) {
+ if (Zone* zone = obs.singleZone()) {
+ return UpdateExecutionObservabilityOfScriptsInZone(cx, zone, obs,
+ observing);
+ }
+
+ using ZoneRange = DebugAPI::ExecutionObservableSet::ZoneRange;
+ for (ZoneRange r = obs.zones()->all(); !r.empty(); r.popFront()) {
+ if (!UpdateExecutionObservabilityOfScriptsInZone(cx, r.front(), obs,
+ observing)) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+template <typename FrameFn>
+/* static */
+void Debugger::forEachOnStackDebuggerFrame(AbstractFramePtr frame,
+ const JS::AutoRequireNoGC& nogc,
+ FrameFn fn) {
+ for (Realm::DebuggerVectorEntry& entry : frame.global()->getDebuggers(nogc)) {
+ Debugger* dbg = entry.dbg;
+ if (FrameMap::Ptr frameEntry = dbg->frames.lookup(frame)) {
+ fn(dbg, frameEntry->value());
+ }
+ }
+}
+
+template <typename FrameFn>
+/* static */
+void Debugger::forEachOnStackOrSuspendedDebuggerFrame(
+ JSContext* cx, AbstractFramePtr frame, const JS::AutoRequireNoGC& nogc,
+ FrameFn fn) {
+ Rooted<AbstractGeneratorObject*> genObj(
+ cx, frame.isGeneratorFrame() ? GetGeneratorObjectForFrame(cx, frame)
+ : nullptr);
+
+ for (Realm::DebuggerVectorEntry& entry : frame.global()->getDebuggers(nogc)) {
+ Debugger* dbg = entry.dbg;
+
+ DebuggerFrame* frameObj = nullptr;
+ if (FrameMap::Ptr frameEntry = dbg->frames.lookup(frame)) {
+ frameObj = frameEntry->value();
+ } else if (GeneratorWeakMap::Ptr frameEntry =
+ dbg->generatorFrames.lookup(genObj)) {
+ frameObj = frameEntry->value();
+ }
+
+ if (frameObj) {
+ fn(dbg, frameObj);
+ }
+ }
+}
+
+/* static */
+bool Debugger::getDebuggerFrames(AbstractFramePtr frame,
+ MutableHandle<DebuggerFrameVector> frames) {
+ bool hadOOM = false;
+ JS::AutoAssertNoGC nogc;
+ forEachOnStackDebuggerFrame(frame, nogc,
+ [&](Debugger*, DebuggerFrame* frameobj) {
+ if (!hadOOM && !frames.append(frameobj)) {
+ hadOOM = true;
+ }
+ });
+ return !hadOOM;
+}
+
+/* static */
+bool Debugger::updateExecutionObservability(
+ JSContext* cx, DebugAPI::ExecutionObservableSet& obs,
+ IsObserving observing) {
+ if (!obs.singleZone() && obs.zones()->empty()) {
+ return true;
+ }
+
+ // Invalidate scripts first so we can set the needsArgsObj flag on scripts
+ // before patching frames.
+ return updateExecutionObservabilityOfScripts(cx, obs, observing) &&
+ updateExecutionObservabilityOfFrames(cx, obs, observing);
+}
+
+/* static */
+bool Debugger::ensureExecutionObservabilityOfScript(JSContext* cx,
+ JSScript* script) {
+ if (script->isDebuggee()) {
+ return true;
+ }
+ ExecutionObservableScript obs(cx, script);
+ return updateExecutionObservability(cx, obs, Observing);
+}
+
+/* static */
+bool DebugAPI::ensureExecutionObservabilityOfOsrFrame(
+ JSContext* cx, AbstractFramePtr osrSourceFrame) {
+ MOZ_ASSERT(osrSourceFrame.isDebuggee());
+ if (osrSourceFrame.script()->hasBaselineScript() &&
+ osrSourceFrame.script()->baselineScript()->hasDebugInstrumentation()) {
+ return true;
+ }
+ ExecutionObservableFrame obs(osrSourceFrame);
+ return Debugger::updateExecutionObservabilityOfFrames(cx, obs, Observing);
+}
+
+/* static */
+bool Debugger::ensureExecutionObservabilityOfFrame(JSContext* cx,
+ AbstractFramePtr frame) {
+ MOZ_ASSERT_IF(frame.hasScript() && frame.script()->isDebuggee(),
+ frame.isDebuggee());
+ MOZ_ASSERT_IF(frame.isWasmDebugFrame(), frame.wasmInstance()->debugEnabled());
+ if (frame.isDebuggee()) {
+ return true;
+ }
+ ExecutionObservableFrame obs(frame);
+ return updateExecutionObservabilityOfFrames(cx, obs, Observing);
+}
+
+/* static */
+bool Debugger::ensureExecutionObservabilityOfRealm(JSContext* cx,
+ Realm* realm) {
+ if (realm->debuggerObservesAllExecution()) {
+ return true;
+ }
+ ExecutionObservableRealms obs(cx);
+ if (!obs.add(realm)) {
+ return false;
+ }
+ realm->updateDebuggerObservesAllExecution();
+ return updateExecutionObservability(cx, obs, Observing);
+}
+
+/* static */
+bool Debugger::hookObservesAllExecution(Hook which) {
+ return which == OnEnterFrame;
+}
+
+Debugger::IsObserving Debugger::observesAllExecution() const {
+ if (!!getHook(OnEnterFrame)) {
+ return Observing;
+ }
+ return NotObserving;
+}
+
+Debugger::IsObserving Debugger::observesAsmJS() const {
+ if (!allowUnobservedAsmJS) {
+ return Observing;
+ }
+ return NotObserving;
+}
+
+Debugger::IsObserving Debugger::observesWasm() const {
+ if (!allowUnobservedWasm) {
+ return Observing;
+ }
+ return NotObserving;
+}
+
+Debugger::IsObserving Debugger::observesCoverage() const {
+ if (collectCoverageInfo) {
+ return Observing;
+ }
+ return NotObserving;
+}
+
+Debugger::IsObserving Debugger::observesNativeCalls() const {
+ if (getHook(Debugger::OnNativeCall)) {
+ return Observing;
+ }
+ return NotObserving;
+}
+
+// Toggle whether this Debugger's debuggees observe all execution. This is
+// called when a hook that observes all execution is set or unset. See
+// hookObservesAllExecution.
+bool Debugger::updateObservesAllExecutionOnDebuggees(JSContext* cx,
+ IsObserving observing) {
+ ExecutionObservableRealms obs(cx);
+
+ for (WeakGlobalObjectSet::Range r = debuggees.all(); !r.empty();
+ r.popFront()) {
+ GlobalObject* global = r.front();
+ JS::Realm* realm = global->realm();
+
+ if (realm->debuggerObservesAllExecution() == observing) {
+ continue;
+ }
+
+ // It's expensive to eagerly invalidate and recompile a realm,
+ // so add the realm to the set only if we are observing.
+ if (observing && !obs.add(realm)) {
+ return false;
+ }
+ }
+
+ if (!updateExecutionObservability(cx, obs, observing)) {
+ return false;
+ }
+
+ using RealmRange = ExecutionObservableRealms::RealmRange;
+ for (RealmRange r = obs.realms()->all(); !r.empty(); r.popFront()) {
+ r.front()->updateDebuggerObservesAllExecution();
+ }
+
+ return true;
+}
+
+bool Debugger::updateObservesCoverageOnDebuggees(JSContext* cx,
+ IsObserving observing) {
+ ExecutionObservableRealms obs(cx);
+
+ for (WeakGlobalObjectSet::Range r = debuggees.all(); !r.empty();
+ r.popFront()) {
+ GlobalObject* global = r.front();
+ Realm* realm = global->realm();
+
+ if (realm->debuggerObservesCoverage() == observing) {
+ continue;
+ }
+
+ // Invalidate and recompile a realm to add or remove PCCounts
+ // increments. We have to eagerly invalidate, as otherwise we might have
+ // dangling pointers to freed PCCounts.
+ if (!obs.add(realm)) {
+ return false;
+ }
+ }
+
+ // If any frame on the stack belongs to the debuggee, then we cannot update
+ // the ScriptCounts, because this would imply to invalidate a Debugger.Frame
+ // to recompile it with/without ScriptCount support.
+ for (FrameIter iter(cx); !iter.done(); ++iter) {
+ if (obs.shouldMarkAsDebuggee(iter)) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_DEBUG_NOT_IDLE);
+ return false;
+ }
+ }
+
+ if (!updateExecutionObservability(cx, obs, observing)) {
+ return false;
+ }
+
+ // All realms can safely be toggled, and all scripts will be recompiled.
+ // Thus we can update each realm accordingly.
+ using RealmRange = ExecutionObservableRealms::RealmRange;
+ for (RealmRange r = obs.realms()->all(); !r.empty(); r.popFront()) {
+ r.front()->updateDebuggerObservesCoverage();
+ }
+
+ return true;
+}
+
+void Debugger::updateObservesAsmJSOnDebuggees(IsObserving observing) {
+ for (WeakGlobalObjectSet::Range r = debuggees.all(); !r.empty();
+ r.popFront()) {
+ GlobalObject* global = r.front();
+ Realm* realm = global->realm();
+
+ if (realm->debuggerObservesAsmJS() == observing) {
+ continue;
+ }
+
+ realm->updateDebuggerObservesAsmJS();
+ }
+}
+
+void Debugger::updateObservesWasmOnDebuggees(IsObserving observing) {
+ for (WeakGlobalObjectSet::Range r = debuggees.all(); !r.empty();
+ r.popFront()) {
+ GlobalObject* global = r.front();
+ Realm* realm = global->realm();
+
+ if (realm->debuggerObservesWasm() == observing) {
+ continue;
+ }
+
+ realm->updateDebuggerObservesWasm();
+ }
+}
+
+/*** Allocations Tracking ***************************************************/
+
+/* static */
+bool Debugger::cannotTrackAllocations(const GlobalObject& global) {
+ auto existingCallback = global.realm()->getAllocationMetadataBuilder();
+ return existingCallback && existingCallback != &SavedStacks::metadataBuilder;
+}
+
+/* static */
+bool DebugAPI::isObservedByDebuggerTrackingAllocations(
+ const GlobalObject& debuggee) {
+ JS::AutoAssertNoGC nogc;
+ for (Realm::DebuggerVectorEntry& entry : debuggee.getDebuggers(nogc)) {
+ // Use unbarrieredGet() to prevent triggering read barrier while
+ // collecting, this is safe as long as dbg does not escape.
+ Debugger* dbg = entry.dbg.unbarrieredGet();
+ if (dbg->trackingAllocationSites) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+/* static */
+bool Debugger::addAllocationsTracking(JSContext* cx,
+ Handle<GlobalObject*> debuggee) {
+ // Precondition: the given global object is being observed by at least one
+ // Debugger that is tracking allocations.
+ MOZ_ASSERT(DebugAPI::isObservedByDebuggerTrackingAllocations(*debuggee));
+
+ if (Debugger::cannotTrackAllocations(*debuggee)) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_OBJECT_METADATA_CALLBACK_ALREADY_SET);
+ return false;
+ }
+
+ debuggee->realm()->setAllocationMetadataBuilder(
+ &SavedStacks::metadataBuilder);
+ debuggee->realm()->chooseAllocationSamplingProbability();
+ return true;
+}
+
+/* static */
+void Debugger::removeAllocationsTracking(GlobalObject& global) {
+ // If there are still Debuggers that are observing allocations, we cannot
+ // remove the metadata callback yet. Recompute the sampling probability
+ // based on the remaining debuggers' needs.
+ if (DebugAPI::isObservedByDebuggerTrackingAllocations(global)) {
+ global.realm()->chooseAllocationSamplingProbability();
+ return;
+ }
+
+ if (!global.realm()->runtimeFromMainThread()->recordAllocationCallback) {
+ // Something like the Gecko Profiler could request from the the JS runtime
+ // to record allocations. If it is recording allocations, then do not
+ // destroy the allocation metadata builder at this time.
+ global.realm()->forgetAllocationMetadataBuilder();
+ }
+}
+
+bool Debugger::addAllocationsTrackingForAllDebuggees(JSContext* cx) {
+ MOZ_ASSERT(trackingAllocationSites);
+
+ // We don't want to end up in a state where we added allocations
+ // tracking to some of our debuggees, but failed to do so for
+ // others. Before attempting to start tracking allocations in *any* of
+ // our debuggees, ensure that we will be able to track allocations for
+ // *all* of our debuggees.
+ for (WeakGlobalObjectSet::Range r = debuggees.all(); !r.empty();
+ r.popFront()) {
+ if (Debugger::cannotTrackAllocations(*r.front().get())) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_OBJECT_METADATA_CALLBACK_ALREADY_SET);
+ return false;
+ }
+ }
+
+ Rooted<GlobalObject*> g(cx);
+ for (WeakGlobalObjectSet::Range r = debuggees.all(); !r.empty();
+ r.popFront()) {
+ // This should always succeed, since we already checked for the
+ // error case above.
+ g = r.front().get();
+ MOZ_ALWAYS_TRUE(Debugger::addAllocationsTracking(cx, g));
+ }
+
+ return true;
+}
+
+void Debugger::removeAllocationsTrackingForAllDebuggees() {
+ for (WeakGlobalObjectSet::Range r = debuggees.all(); !r.empty();
+ r.popFront()) {
+ Debugger::removeAllocationsTracking(*r.front().get());
+ }
+
+ allocationsLog.clear();
+}
+
+/*** Debugger JSObjects *****************************************************/
+
+template <typename F>
+inline void Debugger::forEachWeakMap(const F& f) {
+ f(generatorFrames);
+ f(objects);
+ f(environments);
+ f(scripts);
+ f(sources);
+ f(wasmInstanceScripts);
+ f(wasmInstanceSources);
+}
+
+void Debugger::traceCrossCompartmentEdges(JSTracer* trc) {
+ forEachWeakMap(
+ [trc](auto& weakMap) { weakMap.traceCrossCompartmentEdges(trc); });
+}
+
+/*
+ * Ordinarily, WeakMap keys and values are marked because at some point it was
+ * discovered that the WeakMap was live; that is, some object containing the
+ * WeakMap was marked during mark phase.
+ *
+ * However, during zone GC, we have to do something about cross-compartment
+ * edges in non-GC'd compartments. Since the source may be live, we
+ * conservatively assume it is and mark the edge.
+ *
+ * Each Debugger object keeps five cross-compartment WeakMaps: objects, scripts,
+ * lazy scripts, script source objects, and environments. They have the property
+ * that all their values are in the same compartment as the Debugger object,
+ * but we have to mark the keys and the private pointer in the wrapper object.
+ *
+ * We must scan all Debugger objects regardless of whether they *currently* have
+ * any debuggees in a compartment being GC'd, because the WeakMap entries
+ * persist even when debuggees are removed.
+ *
+ * This happens during the initial mark phase, not iterative marking, because
+ * all the edges being reported here are strong references.
+ *
+ * This method is also used during compacting GC to update cross compartment
+ * pointers into zones that are being compacted.
+ */
+/* static */
+void DebugAPI::traceCrossCompartmentEdges(JSTracer* trc) {
+ MOZ_ASSERT(JS::RuntimeHeapIsMajorCollecting());
+
+ JSRuntime* rt = trc->runtime();
+ gc::State state = rt->gc.state();
+
+ for (Debugger* dbg : rt->debuggerList()) {
+ Zone* zone = MaybeForwarded(dbg->object.get())->zone();
+ if (!zone->isCollecting() || state == gc::State::Compact) {
+ dbg->traceCrossCompartmentEdges(trc);
+ }
+ }
+}
+
+#ifdef DEBUG
+
+static bool RuntimeHasDebugger(JSRuntime* rt, Debugger* dbg) {
+ for (Debugger* d : rt->debuggerList()) {
+ if (d == dbg) {
+ return true;
+ }
+ }
+ return false;
+}
+
+/* static */
+bool DebugAPI::edgeIsInDebuggerWeakmap(JSRuntime* rt, JSObject* src,
+ JS::GCCellPtr dst) {
+ if (!Debugger::isChildJSObject(src)) {
+ return false;
+ }
+
+ if (src->is<DebuggerFrame>()) {
+ DebuggerFrame* frame = &src->as<DebuggerFrame>();
+ Debugger* dbg = frame->owner();
+ MOZ_ASSERT(RuntimeHasDebugger(rt, dbg));
+
+ if (dst.is<BaseScript>()) {
+ // The generatorFrames map is not keyed on the associated JSScript. Get
+ // the key from the source object and check everything matches.
+ AbstractGeneratorObject* genObj = &frame->unwrappedGenerator();
+ return frame->generatorScript() == &dst.as<BaseScript>() &&
+ dbg->generatorFrames.hasEntry(genObj, src);
+ }
+ return dst.is<JSObject>() &&
+ dst.as<JSObject>().is<AbstractGeneratorObject>() &&
+ dbg->generatorFrames.hasEntry(
+ &dst.as<JSObject>().as<AbstractGeneratorObject>(), src);
+ }
+ if (src->is<DebuggerObject>()) {
+ Debugger* dbg = src->as<DebuggerObject>().owner();
+ MOZ_ASSERT(RuntimeHasDebugger(rt, dbg));
+ return dst.is<JSObject>() &&
+ dbg->objects.hasEntry(&dst.as<JSObject>(), src);
+ }
+ if (src->is<DebuggerEnvironment>()) {
+ Debugger* dbg = src->as<DebuggerEnvironment>().owner();
+ MOZ_ASSERT(RuntimeHasDebugger(rt, dbg));
+ return dst.is<JSObject>() &&
+ dbg->environments.hasEntry(&dst.as<JSObject>(), src);
+ }
+ if (src->is<DebuggerScript>()) {
+ Debugger* dbg = src->as<DebuggerScript>().owner();
+ MOZ_ASSERT(RuntimeHasDebugger(rt, dbg));
+
+ return src->as<DebuggerScript>().getReferent().match(
+ [=](BaseScript* script) {
+ return dst.is<BaseScript>() && script == &dst.as<BaseScript>() &&
+ dbg->scripts.hasEntry(script, src);
+ },
+ [=](WasmInstanceObject* instance) {
+ return dst.is<JSObject>() && instance == &dst.as<JSObject>() &&
+ dbg->wasmInstanceScripts.hasEntry(instance, src);
+ });
+ }
+ if (src->is<DebuggerSource>()) {
+ Debugger* dbg = src->as<DebuggerSource>().owner();
+ MOZ_ASSERT(RuntimeHasDebugger(rt, dbg));
+
+ return src->as<DebuggerSource>().getReferent().match(
+ [=](ScriptSourceObject* sso) {
+ return dst.is<JSObject>() && sso == &dst.as<JSObject>() &&
+ dbg->sources.hasEntry(sso, src);
+ },
+ [=](WasmInstanceObject* instance) {
+ return dst.is<JSObject>() && instance == &dst.as<JSObject>() &&
+ dbg->wasmInstanceSources.hasEntry(instance, src);
+ });
+ }
+ MOZ_ASSERT_UNREACHABLE("Unhandled cross-compartment edge");
+}
+
+#endif
+
+/* See comments in DebugAPI.h. */
+void DebugAPI::traceFramesWithLiveHooks(JSTracer* tracer) {
+ JSRuntime* rt = tracer->runtime();
+
+ // Note that we must loop over all Debuggers here, not just those known to be
+ // reachable from JavaScript. The existence of hooks set on a Debugger.Frame
+ // for a live stack frame makes the Debuger.Frame (and hence its Debugger)
+ // reachable.
+ for (Debugger* dbg : rt->debuggerList()) {
+ // Callback tracers set their own traversal boundaries, but otherwise we're
+ // only interested in Debugger.Frames participating in the collection.
+ if (!dbg->zone()->isGCMarking() && !tracer->isCallbackTracer()) {
+ continue;
+ }
+
+ for (Debugger::FrameMap::Range r = dbg->frames.all(); !r.empty();
+ r.popFront()) {
+ HeapPtr<DebuggerFrame*>& frameobj = r.front().value();
+ MOZ_ASSERT(frameobj->isOnStack());
+ if (frameobj->hasAnyHooks()) {
+ TraceEdge(tracer, &frameobj, "Debugger.Frame with live hooks");
+ }
+ }
+ }
+}
+
+void DebugAPI::slowPathTraceGeneratorFrame(JSTracer* tracer,
+ AbstractGeneratorObject* generator) {
+ MOZ_ASSERT(generator->realm()->isDebuggee());
+
+ // Ignore generic tracers.
+ //
+ // There are two kinds of generic tracers we need to bar: MovingTracers used
+ // by compacting GC; and CompartmentCheckTracers.
+ //
+ // MovingTracers are used by the compacting GC to update pointers to objects
+ // that have been moved: the MovingTracer checks each outgoing pointer to see
+ // if it refers to a forwarding pointer, and if so, updates the pointer stored
+ // in the object.
+ //
+ // Generator objects are background finalized, so the compacting GC assumes it
+ // can update their pointers in the background as well. Since we treat
+ // generator objects as having an owning edge to their Debugger.Frame objects,
+ // a helper thread trying to update a generator object will end up calling
+ // this function. However, it is verboten to do weak map lookups (e.g., in
+ // Debugger::generatorFrames) off the main thread, since StableCellHasher
+ // must consult the Zone to find the key's unique id.
+ //
+ // Fortunately, it's not necessary for compacting GC to worry about that edge
+ // in the first place: the edge isn't a literal pointer stored on the
+ // generator object, it's only inferred from the realm's debuggee status and
+ // its Debuggers' generatorFrames weak maps. Those get relocated when the
+ // Debugger itself is visited, so compacting GC can just ignore this edge.
+ //
+ // CompartmentCheckTracers walk the graph and verify that all
+ // cross-compartment edges are recorded in the cross-compartment wrapper
+ // tables. But edges between Debugger.Foo objects and their referents are not
+ // in the CCW tables, so a CrossCompartmentCheckTracers also calls
+ // DebugAPI::edgeIsInDebuggerWeakmap to see if a given cross-compartment edge
+ // is accounted for there. However, edgeIsInDebuggerWeakmap only handles
+ // debugger -> debuggee edges, so it won't recognize the edge we're
+ // potentially traversing here, from a generator object to its Debugger.Frame.
+ //
+ // But since the purpose of this function is to retrieve such edges, if they
+ // exist, from the very tables that edgeIsInDebuggerWeakmap would consult,
+ // we're at no risk of reporting edges that they do not cover. So we can
+ // safely hide the edges from CompartmentCheckTracers.
+ //
+ // We can't quite recognize MovingTracers and CompartmentCheckTracers
+ // precisely, but they're both generic tracers, so we just show them all the
+ // door. This means the generator -> Debugger.Frame edge is going to be
+ // invisible to some traversals. We'll cope with that when it's a problem.
+ if (!tracer->isMarkingTracer()) {
+ return;
+ }
+
+ mozilla::Maybe<AutoLockGC> lock;
+ GCMarker* marker = GCMarker::fromTracer(tracer);
+ if (marker->isParallelMarking()) {
+ // Synchronise access to generatorFrames.
+ lock.emplace(marker->runtime());
+ }
+
+ JS::AutoAssertNoGC nogc;
+ for (Realm::DebuggerVectorEntry& entry :
+ generator->realm()->getDebuggers(nogc)) {
+ Debugger* dbg = entry.dbg.unbarrieredGet();
+
+ if (Debugger::GeneratorWeakMap::Ptr entry =
+ dbg->generatorFrames.lookupUnbarriered(generator)) {
+ HeapPtr<DebuggerFrame*>& frameObj = entry->value();
+ if (frameObj->hasAnyHooks()) {
+ // See comment above.
+ TraceCrossCompartmentEdge(tracer, generator, &frameObj,
+ "Debugger.Frame with hooks for generator");
+ }
+ }
+ }
+}
+
+/* static */
+void DebugAPI::traceAllForMovingGC(JSTracer* trc) {
+ JSRuntime* rt = trc->runtime();
+ for (Debugger* dbg : rt->debuggerList()) {
+ dbg->traceForMovingGC(trc);
+ }
+}
+
+/*
+ * Trace all debugger-owned GC things unconditionally. This is used during
+ * compacting GC and in minor GC: the minor GC cannot apply the weak constraints
+ * of the full GC because it visits only part of the heap.
+ */
+void Debugger::traceForMovingGC(JSTracer* trc) {
+ trace(trc);
+
+ for (WeakGlobalObjectSet::Enum e(debuggees); !e.empty(); e.popFront()) {
+ TraceEdge(trc, &e.mutableFront(), "Global Object");
+ }
+}
+
+/* static */
+void Debugger::traceObject(JSTracer* trc, JSObject* obj) {
+ if (Debugger* dbg = Debugger::fromJSObject(obj)) {
+ dbg->trace(trc);
+ }
+}
+
+void Debugger::trace(JSTracer* trc) {
+ TraceEdge(trc, &object, "Debugger Object");
+
+ TraceNullableEdge(trc, &uncaughtExceptionHook, "hooks");
+
+ // Mark Debugger.Frame objects. Since the Debugger is reachable, JS could call
+ // getNewestFrame and then walk the stack, so these are all reachable from JS.
+ //
+ // Note that if a Debugger.Frame has hooks set, it must be retained even if
+ // its Debugger is unreachable, since JS could observe that its hooks did not
+ // fire. That case is handled by DebugAPI::traceFrames.
+ //
+ // (We have weakly-referenced Debugger.Frame objects as well, for suspended
+ // generator frames; these are traced via generatorFrames just below.)
+ for (FrameMap::Range r = frames.all(); !r.empty(); r.popFront()) {
+ HeapPtr<DebuggerFrame*>& frameobj = r.front().value();
+ TraceEdge(trc, &frameobj, "live Debugger.Frame");
+ MOZ_ASSERT(frameobj->isOnStack());
+ }
+
+ allocationsLog.trace(trc);
+
+ forEachWeakMap([trc](auto& weakMap) { weakMap.trace(trc); });
+}
+
+/* static */
+void DebugAPI::traceFromRealm(JSTracer* trc, Realm* realm) {
+ JS::AutoAssertNoGC nogc;
+ for (Realm::DebuggerVectorEntry& entry : realm->getDebuggers(nogc)) {
+ TraceEdge(trc, &entry.debuggerLink, "realm debugger");
+ }
+}
+
+/* static */
+void DebugAPI::sweepAll(JS::GCContext* gcx) {
+ JSRuntime* rt = gcx->runtime();
+
+ Debugger* next;
+ for (Debugger* dbg = rt->debuggerList().getFirst(); dbg; dbg = next) {
+ next = dbg->getNext();
+
+ // Debugger.Frames for generator calls bump the JSScript's
+ // generatorObserverCount, so the JIT will instrument the code to notify
+ // Debugger when the generator is resumed. When a Debugger.Frame gets GC'd,
+ // generatorObserverCount needs to be decremented. It's much easier to do
+ // this when we know that all parties involved - the Debugger.Frame, the
+ // generator object, and the JSScript - have not yet been finalized.
+ //
+ // Since DebugAPI::sweepAll is called after everything is marked, but before
+ // anything has been finalized, this is the perfect place to drop the count.
+ if (dbg->zone()->isGCSweeping()) {
+ for (Debugger::GeneratorWeakMap::Enum e(dbg->generatorFrames); !e.empty();
+ e.popFront()) {
+ DebuggerFrame* frameObj = e.front().value();
+ if (IsAboutToBeFinalizedUnbarriered(frameObj)) {
+ // If the DebuggerFrame is being finalized, that means either:
+ // 1) It is not present in "frames".
+ // 2) The Debugger itself is also being finalized.
+ //
+ // In the first case, passing the frame is not necessary because there
+ // isn't a frame entry to clear, and in the second case,
+ // removeDebuggeeGlobal below will iterate and remove the entries
+ // anyway, so things will be cleaned up properly.
+ Debugger::terminateDebuggerFrame(gcx, dbg, frameObj, NullFramePtr(),
+ nullptr, &e);
+ }
+ }
+ }
+
+ // Detach dying debuggers and debuggees from each other. Since this
+ // requires access to both objects it must be done before either
+ // object is finalized.
+ bool debuggerDying = IsAboutToBeFinalized(dbg->object);
+ for (WeakGlobalObjectSet::Enum e(dbg->debuggees); !e.empty();
+ e.popFront()) {
+ GlobalObject* global = e.front().unbarrieredGet();
+ if (debuggerDying || IsAboutToBeFinalizedUnbarriered(global)) {
+ dbg->removeDebuggeeGlobal(gcx, e.front().unbarrieredGet(), &e,
+ Debugger::FromSweep::Yes);
+ }
+ }
+
+ if (debuggerDying) {
+ gcx->delete_(dbg->object, dbg, MemoryUse::Debugger);
+ }
+
+ dbg = next;
+ }
+}
+
+static inline bool SweepZonesInSameGroup(Zone* a, Zone* b) {
+ // Ensure two zones are swept in the same sweep group by adding an edge
+ // between them in each direction.
+ return a->addSweepGroupEdgeTo(b) && b->addSweepGroupEdgeTo(a);
+}
+
+/* static */
+bool DebugAPI::findSweepGroupEdges(JSRuntime* rt) {
+ // Ensure that debuggers and their debuggees are finalized in the same group
+ // by adding edges in both directions for debuggee zones. These are weak
+ // references that are not in the cross compartment wrapper map.
+
+ for (Debugger* dbg : rt->debuggerList()) {
+ Zone* debuggerZone = dbg->object->zone();
+ if (!debuggerZone->isGCMarking()) {
+ continue;
+ }
+
+ for (auto e = dbg->debuggeeZones.all(); !e.empty(); e.popFront()) {
+ Zone* debuggeeZone = e.front();
+ if (!debuggeeZone->isGCMarking()) {
+ continue;
+ }
+
+ if (!SweepZonesInSameGroup(debuggerZone, debuggeeZone)) {
+ return false;
+ }
+ }
+ }
+
+ return true;
+}
+
+template <class UnbarrieredKey, class Wrapper, bool InvisibleKeysOk>
+bool DebuggerWeakMap<UnbarrieredKey, Wrapper,
+ InvisibleKeysOk>::findSweepGroupEdges() {
+ Zone* debuggerZone = zone();
+ MOZ_ASSERT(debuggerZone->isGCMarking());
+ for (Enum e(*this); !e.empty(); e.popFront()) {
+ MOZ_ASSERT(e.front().value()->zone() == debuggerZone);
+
+ Zone* keyZone = e.front().key()->zone();
+ if (keyZone->isGCMarking() &&
+ !SweepZonesInSameGroup(debuggerZone, keyZone)) {
+ return false;
+ }
+ }
+
+ // Add in edges for delegates, if relevant for the key type.
+ return Base::findSweepGroupEdges();
+}
+
+const JSClassOps DebuggerInstanceObject::classOps_ = {
+ nullptr, // addProperty
+ nullptr, // delProperty
+ nullptr, // enumerate
+ nullptr, // newEnumerate
+ nullptr, // resolve
+ nullptr, // mayResolve
+ nullptr, // finalize
+ nullptr, // call
+ nullptr, // construct
+ Debugger::traceObject, // trace
+};
+
+const JSClass DebuggerInstanceObject::class_ = {
+ "Debugger", JSCLASS_HAS_RESERVED_SLOTS(Debugger::JSSLOT_DEBUG_COUNT),
+ &classOps_};
+
+static_assert(Debugger::JSSLOT_DEBUG_PROTO_START == 0,
+ "DebuggerPrototypeObject only needs slots for the proto objects");
+
+const JSClass DebuggerPrototypeObject::class_ = {
+ "DebuggerPrototype",
+ JSCLASS_HAS_RESERVED_SLOTS(Debugger::JSSLOT_DEBUG_PROTO_STOP)};
+
+static Debugger* Debugger_fromThisValue(JSContext* cx, const CallArgs& args,
+ const char* fnname) {
+ JSObject* thisobj = RequireObject(cx, args.thisv());
+ if (!thisobj) {
+ return nullptr;
+ }
+ if (!thisobj->is<DebuggerInstanceObject>()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_INCOMPATIBLE_PROTO, "Debugger", fnname,
+ thisobj->getClass()->name);
+ return nullptr;
+ }
+
+ Debugger* dbg = Debugger::fromJSObject(thisobj);
+ MOZ_ASSERT(dbg);
+ return dbg;
+}
+
+struct MOZ_STACK_CLASS Debugger::CallData {
+ JSContext* cx;
+ const CallArgs& args;
+
+ Debugger* dbg;
+
+ CallData(JSContext* cx, const CallArgs& args, Debugger* dbg)
+ : cx(cx), args(args), dbg(dbg) {}
+
+ bool getOnDebuggerStatement();
+ bool setOnDebuggerStatement();
+ bool getOnExceptionUnwind();
+ bool setOnExceptionUnwind();
+ bool getOnNewScript();
+ bool setOnNewScript();
+ bool getOnEnterFrame();
+ bool setOnEnterFrame();
+ bool getOnNativeCall();
+ bool setOnNativeCall();
+ bool getOnNewGlobalObject();
+ bool setOnNewGlobalObject();
+ bool getOnNewPromise();
+ bool setOnNewPromise();
+ bool getOnPromiseSettled();
+ bool setOnPromiseSettled();
+ bool getUncaughtExceptionHook();
+ bool setUncaughtExceptionHook();
+ bool getAllowUnobservedAsmJS();
+ bool setAllowUnobservedAsmJS();
+ bool getAllowUnobservedWasm();
+ bool setAllowUnobservedWasm();
+ bool getCollectCoverageInfo();
+ bool setCollectCoverageInfo();
+ bool getMemory();
+ bool addDebuggee();
+ bool addAllGlobalsAsDebuggees();
+ bool removeDebuggee();
+ bool removeAllDebuggees();
+ bool hasDebuggee();
+ bool getDebuggees();
+ bool getNewestFrame();
+ bool clearAllBreakpoints();
+ bool findScripts();
+ bool findSources();
+ bool findObjects();
+ bool findAllGlobals();
+ bool findSourceURLs();
+ bool makeGlobalObjectReference();
+ bool adoptDebuggeeValue();
+ bool adoptFrame();
+ bool adoptSource();
+ bool enableAsyncStack();
+ bool disableAsyncStack();
+ bool enableUnlimitedStacksCapturing();
+ bool disableUnlimitedStacksCapturing();
+
+ using Method = bool (CallData::*)();
+
+ template <Method MyMethod>
+ static bool ToNative(JSContext* cx, unsigned argc, Value* vp);
+};
+
+template <Debugger::CallData::Method MyMethod>
+/* static */
+bool Debugger::CallData::ToNative(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+
+ Debugger* dbg = Debugger_fromThisValue(cx, args, "method");
+ if (!dbg) {
+ return false;
+ }
+
+ CallData data(cx, args, dbg);
+ return (data.*MyMethod)();
+}
+
+/* static */
+bool Debugger::getHookImpl(JSContext* cx, const CallArgs& args, Debugger& dbg,
+ Hook which) {
+ MOZ_ASSERT(which >= 0 && which < HookCount);
+ args.rval().set(dbg.object->getReservedSlot(
+ JSSLOT_DEBUG_HOOK_START + std::underlying_type_t<Hook>(which)));
+ return true;
+}
+
+/* static */
+bool Debugger::setHookImpl(JSContext* cx, const CallArgs& args, Debugger& dbg,
+ Hook which) {
+ MOZ_ASSERT(which >= 0 && which < HookCount);
+ if (!args.requireAtLeast(cx, "Debugger.setHook", 1)) {
+ return false;
+ }
+ if (args[0].isObject()) {
+ if (!args[0].toObject().isCallable()) {
+ return ReportIsNotFunction(cx, args[0], args.length() - 1);
+ }
+ } else if (!args[0].isUndefined()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_NOT_CALLABLE_OR_UNDEFINED);
+ return false;
+ }
+ uint32_t slot = JSSLOT_DEBUG_HOOK_START + std::underlying_type_t<Hook>(which);
+ RootedValue oldHook(cx, dbg.object->getReservedSlot(slot));
+ dbg.object->setReservedSlot(slot, args[0]);
+ if (hookObservesAllExecution(which)) {
+ if (!dbg.updateObservesAllExecutionOnDebuggees(
+ cx, dbg.observesAllExecution())) {
+ dbg.object->setReservedSlot(slot, oldHook);
+ return false;
+ }
+ }
+
+ Rooted<DebuggerDebuggeeLink*> debuggeeLink(cx, dbg.getDebuggeeLink());
+ if (dbg.hasAnyLiveHooks()) {
+ debuggeeLink->setLinkSlot(dbg);
+ } else {
+ debuggeeLink->clearLinkSlot();
+ }
+
+ args.rval().setUndefined();
+ return true;
+}
+
+/* static */
+bool Debugger::getGarbageCollectionHook(JSContext* cx, const CallArgs& args,
+ Debugger& dbg) {
+ return getHookImpl(cx, args, dbg, OnGarbageCollection);
+}
+
+/* static */
+bool Debugger::setGarbageCollectionHook(JSContext* cx, const CallArgs& args,
+ Debugger& dbg) {
+ Rooted<JSObject*> oldHook(cx, dbg.getHook(OnGarbageCollection));
+
+ if (!setHookImpl(cx, args, dbg, OnGarbageCollection)) {
+ // We want to maintain the invariant that the hook is always set when the
+ // Debugger is in the runtime's list, and vice-versa, so if we return early
+ // and don't adjust the watcher list below, we need to be sure that the
+ // hook didn't change.
+ MOZ_ASSERT(dbg.getHook(OnGarbageCollection) == oldHook);
+ return false;
+ }
+
+ // Add or remove ourselves from the runtime's list of Debuggers that care
+ // about garbage collection.
+ JSObject* newHook = dbg.getHook(OnGarbageCollection);
+ if (!oldHook && newHook) {
+ cx->runtime()->onGarbageCollectionWatchers().pushBack(&dbg);
+ } else if (oldHook && !newHook) {
+ cx->runtime()->onGarbageCollectionWatchers().remove(&dbg);
+ }
+
+ return true;
+}
+
+bool Debugger::CallData::getOnDebuggerStatement() {
+ return getHookImpl(cx, args, *dbg, OnDebuggerStatement);
+}
+
+bool Debugger::CallData::setOnDebuggerStatement() {
+ return setHookImpl(cx, args, *dbg, OnDebuggerStatement);
+}
+
+bool Debugger::CallData::getOnExceptionUnwind() {
+ return getHookImpl(cx, args, *dbg, OnExceptionUnwind);
+}
+
+bool Debugger::CallData::setOnExceptionUnwind() {
+ return setHookImpl(cx, args, *dbg, OnExceptionUnwind);
+}
+
+bool Debugger::CallData::getOnNewScript() {
+ return getHookImpl(cx, args, *dbg, OnNewScript);
+}
+
+bool Debugger::CallData::setOnNewScript() {
+ return setHookImpl(cx, args, *dbg, OnNewScript);
+}
+
+bool Debugger::CallData::getOnNewPromise() {
+ return getHookImpl(cx, args, *dbg, OnNewPromise);
+}
+
+bool Debugger::CallData::setOnNewPromise() {
+ return setHookImpl(cx, args, *dbg, OnNewPromise);
+}
+
+bool Debugger::CallData::getOnPromiseSettled() {
+ return getHookImpl(cx, args, *dbg, OnPromiseSettled);
+}
+
+bool Debugger::CallData::setOnPromiseSettled() {
+ return setHookImpl(cx, args, *dbg, OnPromiseSettled);
+}
+
+bool Debugger::CallData::getOnEnterFrame() {
+ return getHookImpl(cx, args, *dbg, OnEnterFrame);
+}
+
+bool Debugger::CallData::setOnEnterFrame() {
+ return setHookImpl(cx, args, *dbg, OnEnterFrame);
+}
+
+bool Debugger::CallData::getOnNativeCall() {
+ return getHookImpl(cx, args, *dbg, OnNativeCall);
+}
+
+bool Debugger::CallData::setOnNativeCall() {
+ return setHookImpl(cx, args, *dbg, OnNativeCall);
+}
+
+bool Debugger::CallData::getOnNewGlobalObject() {
+ return getHookImpl(cx, args, *dbg, OnNewGlobalObject);
+}
+
+bool Debugger::CallData::setOnNewGlobalObject() {
+ RootedObject oldHook(cx, dbg->getHook(OnNewGlobalObject));
+
+ if (!setHookImpl(cx, args, *dbg, OnNewGlobalObject)) {
+ return false;
+ }
+
+ // Add or remove ourselves from the runtime's list of Debuggers that care
+ // about new globals.
+ JSObject* newHook = dbg->getHook(OnNewGlobalObject);
+ if (!oldHook && newHook) {
+ cx->runtime()->onNewGlobalObjectWatchers().pushBack(dbg);
+ } else if (oldHook && !newHook) {
+ cx->runtime()->onNewGlobalObjectWatchers().remove(dbg);
+ }
+
+ return true;
+}
+
+bool Debugger::CallData::getUncaughtExceptionHook() {
+ args.rval().setObjectOrNull(dbg->uncaughtExceptionHook);
+ return true;
+}
+
+bool Debugger::CallData::setUncaughtExceptionHook() {
+ if (!args.requireAtLeast(cx, "Debugger.set uncaughtExceptionHook", 1)) {
+ return false;
+ }
+ if (!args[0].isNull() &&
+ (!args[0].isObject() || !args[0].toObject().isCallable())) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_ASSIGN_FUNCTION_OR_NULL,
+ "uncaughtExceptionHook");
+ return false;
+ }
+ dbg->uncaughtExceptionHook = args[0].toObjectOrNull();
+ args.rval().setUndefined();
+ return true;
+}
+
+bool Debugger::CallData::getAllowUnobservedAsmJS() {
+ args.rval().setBoolean(dbg->allowUnobservedAsmJS);
+ return true;
+}
+
+bool Debugger::CallData::setAllowUnobservedAsmJS() {
+ if (!args.requireAtLeast(cx, "Debugger.set allowUnobservedAsmJS", 1)) {
+ return false;
+ }
+ dbg->allowUnobservedAsmJS = ToBoolean(args[0]);
+
+ for (WeakGlobalObjectSet::Range r = dbg->debuggees.all(); !r.empty();
+ r.popFront()) {
+ GlobalObject* global = r.front();
+ Realm* realm = global->realm();
+ realm->updateDebuggerObservesAsmJS();
+ }
+
+ args.rval().setUndefined();
+ return true;
+}
+
+bool Debugger::CallData::getAllowUnobservedWasm() {
+ args.rval().setBoolean(dbg->allowUnobservedWasm);
+ return true;
+}
+
+bool Debugger::CallData::setAllowUnobservedWasm() {
+ if (!args.requireAtLeast(cx, "Debugger.set allowUnobservedWasm", 1)) {
+ return false;
+ }
+ dbg->allowUnobservedWasm = ToBoolean(args[0]);
+
+ for (WeakGlobalObjectSet::Range r = dbg->debuggees.all(); !r.empty();
+ r.popFront()) {
+ GlobalObject* global = r.front();
+ Realm* realm = global->realm();
+ realm->updateDebuggerObservesWasm();
+ }
+
+ args.rval().setUndefined();
+ return true;
+}
+
+bool Debugger::CallData::getCollectCoverageInfo() {
+ args.rval().setBoolean(dbg->collectCoverageInfo);
+ return true;
+}
+
+bool Debugger::CallData::setCollectCoverageInfo() {
+ if (!args.requireAtLeast(cx, "Debugger.set collectCoverageInfo", 1)) {
+ return false;
+ }
+ dbg->collectCoverageInfo = ToBoolean(args[0]);
+
+ IsObserving observing = dbg->collectCoverageInfo ? Observing : NotObserving;
+ if (!dbg->updateObservesCoverageOnDebuggees(cx, observing)) {
+ return false;
+ }
+
+ args.rval().setUndefined();
+ return true;
+}
+
+bool Debugger::CallData::getMemory() {
+ Value memoryValue =
+ dbg->object->getReservedSlot(JSSLOT_DEBUG_MEMORY_INSTANCE);
+
+ if (!memoryValue.isObject()) {
+ RootedObject memory(cx, DebuggerMemory::create(cx, dbg));
+ if (!memory) {
+ return false;
+ }
+ memoryValue = ObjectValue(*memory);
+ }
+
+ args.rval().set(memoryValue);
+ return true;
+}
+
+/*
+ * Given a value used to designate a global (there's quite a variety; see the
+ * docs), return the actual designee.
+ *
+ * Note that this does not check whether the designee is marked "invisible to
+ * Debugger" or not; different callers need to handle invisible-to-Debugger
+ * globals in different ways.
+ */
+GlobalObject* Debugger::unwrapDebuggeeArgument(JSContext* cx, const Value& v) {
+ if (!v.isObject()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_UNEXPECTED_TYPE, "argument",
+ "not a global object");
+ return nullptr;
+ }
+
+ RootedObject obj(cx, &v.toObject());
+
+ // If it's a Debugger.Object belonging to this debugger, dereference that.
+ if (obj->getClass() == &DebuggerObject::class_) {
+ RootedValue rv(cx, v);
+ if (!unwrapDebuggeeValue(cx, &rv)) {
+ return nullptr;
+ }
+ obj = &rv.toObject();
+ }
+
+ // If we have a cross-compartment wrapper, dereference as far as is secure.
+ //
+ // Since we're dealing with globals, we may have a WindowProxy here. So we
+ // have to make sure to do a dynamic unwrap, and we want to unwrap the
+ // WindowProxy too, if we have one.
+ obj = CheckedUnwrapDynamic(obj, cx, /* stopAtWindowProxy = */ false);
+ if (!obj) {
+ ReportAccessDenied(cx);
+ return nullptr;
+ }
+
+ // If that didn't produce a global object, it's an error.
+ if (!obj->is<GlobalObject>()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_UNEXPECTED_TYPE, "argument",
+ "not a global object");
+ return nullptr;
+ }
+
+ return &obj->as<GlobalObject>();
+}
+
+bool Debugger::CallData::addDebuggee() {
+ if (!args.requireAtLeast(cx, "Debugger.addDebuggee", 1)) {
+ return false;
+ }
+ Rooted<GlobalObject*> global(cx, dbg->unwrapDebuggeeArgument(cx, args[0]));
+ if (!global) {
+ return false;
+ }
+
+ if (!dbg->addDebuggeeGlobal(cx, global)) {
+ return false;
+ }
+
+ RootedValue v(cx, ObjectValue(*global));
+ if (!dbg->wrapDebuggeeValue(cx, &v)) {
+ return false;
+ }
+ args.rval().set(v);
+ return true;
+}
+
+bool Debugger::CallData::addAllGlobalsAsDebuggees() {
+ for (CompartmentsIter comp(cx->runtime()); !comp.done(); comp.next()) {
+ if (comp == dbg->object->compartment()) {
+ continue;
+ }
+ for (RealmsInCompartmentIter r(comp); !r.done(); r.next()) {
+ if (r->creationOptions().invisibleToDebugger()) {
+ continue;
+ }
+ r->compartment()->gcState.scheduledForDestruction = false;
+ GlobalObject* global = r->maybeGlobal();
+ if (global) {
+ Rooted<GlobalObject*> rg(cx, global);
+ if (!dbg->addDebuggeeGlobal(cx, rg)) {
+ return false;
+ }
+ }
+ }
+ }
+
+ args.rval().setUndefined();
+ return true;
+}
+
+bool Debugger::CallData::removeDebuggee() {
+ if (!args.requireAtLeast(cx, "Debugger.removeDebuggee", 1)) {
+ return false;
+ }
+ Rooted<GlobalObject*> global(cx, dbg->unwrapDebuggeeArgument(cx, args[0]));
+ if (!global) {
+ return false;
+ }
+
+ ExecutionObservableRealms obs(cx);
+
+ if (dbg->debuggees.has(global)) {
+ dbg->removeDebuggeeGlobal(cx->gcContext(), global, nullptr, FromSweep::No);
+
+ // Only update the realm if there are no Debuggers left, as it's
+ // expensive to check if no other Debugger has a live script or frame
+ // hook on any of the current on-stack debuggee frames.
+ if (!global->hasDebuggers() && !obs.add(global->realm())) {
+ return false;
+ }
+ if (!updateExecutionObservability(cx, obs, NotObserving)) {
+ return false;
+ }
+ }
+
+ args.rval().setUndefined();
+ return true;
+}
+
+bool Debugger::CallData::removeAllDebuggees() {
+ ExecutionObservableRealms obs(cx);
+
+ for (WeakGlobalObjectSet::Enum e(dbg->debuggees); !e.empty(); e.popFront()) {
+ Rooted<GlobalObject*> global(cx, e.front());
+ dbg->removeDebuggeeGlobal(cx->gcContext(), global, &e, FromSweep::No);
+
+ // See note about adding to the observable set in removeDebuggee.
+ if (!global->hasDebuggers() && !obs.add(global->realm())) {
+ return false;
+ }
+ }
+
+ if (!updateExecutionObservability(cx, obs, NotObserving)) {
+ return false;
+ }
+
+ args.rval().setUndefined();
+ return true;
+}
+
+bool Debugger::CallData::hasDebuggee() {
+ if (!args.requireAtLeast(cx, "Debugger.hasDebuggee", 1)) {
+ return false;
+ }
+ GlobalObject* global = dbg->unwrapDebuggeeArgument(cx, args[0]);
+ if (!global) {
+ return false;
+ }
+ args.rval().setBoolean(!!dbg->debuggees.lookup(global));
+ return true;
+}
+
+bool Debugger::CallData::getDebuggees() {
+ // Obtain the list of debuggees before wrapping each debuggee, as a GC could
+ // update the debuggees set while we are iterating it.
+ unsigned count = dbg->debuggees.count();
+ RootedValueVector debuggees(cx);
+ if (!debuggees.resize(count)) {
+ return false;
+ }
+ unsigned i = 0;
+ {
+ JS::AutoCheckCannotGC nogc;
+ for (WeakGlobalObjectSet::Enum e(dbg->debuggees); !e.empty();
+ e.popFront()) {
+ debuggees[i++].setObject(*e.front().get());
+ }
+ }
+
+ Rooted<ArrayObject*> arrobj(cx, NewDenseFullyAllocatedArray(cx, count));
+ if (!arrobj) {
+ return false;
+ }
+ arrobj->ensureDenseInitializedLength(0, count);
+ for (i = 0; i < count; i++) {
+ RootedValue v(cx, debuggees[i]);
+ if (!dbg->wrapDebuggeeValue(cx, &v)) {
+ return false;
+ }
+ arrobj->setDenseElement(i, v);
+ }
+
+ args.rval().setObject(*arrobj);
+ return true;
+}
+
+bool Debugger::CallData::getNewestFrame() {
+ // Since there may be multiple contexts, use AllFramesIter.
+ for (AllFramesIter i(cx); !i.done(); ++i) {
+ if (dbg->observesFrame(i)) {
+ // Ensure that Ion frames are rematerialized. Only rematerialized
+ // Ion frames may be used as AbstractFramePtrs.
+ if (i.isIon() && !i.ensureHasRematerializedFrame(cx)) {
+ return false;
+ }
+ AbstractFramePtr frame = i.abstractFramePtr();
+ FrameIter iter(i.activation()->cx());
+ while (!iter.hasUsableAbstractFramePtr() ||
+ iter.abstractFramePtr() != frame) {
+ ++iter;
+ }
+ return dbg->getFrame(cx, iter, args.rval());
+ }
+ }
+ args.rval().setNull();
+ return true;
+}
+
+bool Debugger::CallData::clearAllBreakpoints() {
+ JS::GCContext* gcx = cx->gcContext();
+ Breakpoint* nextbp;
+ for (Breakpoint* bp = dbg->firstBreakpoint(); bp; bp = nextbp) {
+ nextbp = bp->nextInDebugger();
+
+ bp->remove(gcx);
+ }
+ MOZ_ASSERT(!dbg->firstBreakpoint());
+
+ return true;
+}
+
+/* static */
+bool Debugger::construct(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+
+ // Check that the arguments, if any, are cross-compartment wrappers.
+ for (unsigned i = 0; i < args.length(); i++) {
+ JSObject* argobj = RequireObject(cx, args[i]);
+ if (!argobj) {
+ return false;
+ }
+ if (!argobj->is<CrossCompartmentWrapperObject>()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_DEBUG_CCW_REQUIRED, "Debugger");
+ return false;
+ }
+ }
+
+ // Get Debugger.prototype.
+ RootedValue v(cx);
+ RootedObject callee(cx, &args.callee());
+ if (!GetProperty(cx, callee, callee, cx->names().prototype, &v)) {
+ return false;
+ }
+ Rooted<NativeObject*> proto(cx, &v.toObject().as<NativeObject>());
+ MOZ_ASSERT(proto->is<DebuggerPrototypeObject>());
+
+ // Make the new Debugger object. Each one has a reference to
+ // Debugger.{Frame,Object,Script,Memory}.prototype in reserved slots. The
+ // rest of the reserved slots are for hooks; they default to undefined.
+ Rooted<DebuggerInstanceObject*> obj(
+ cx, NewTenuredObjectWithGivenProto<DebuggerInstanceObject>(cx, proto));
+ if (!obj) {
+ return false;
+ }
+ for (unsigned slot = JSSLOT_DEBUG_PROTO_START; slot < JSSLOT_DEBUG_PROTO_STOP;
+ slot++) {
+ obj->setReservedSlot(slot, proto->getReservedSlot(slot));
+ }
+ obj->setReservedSlot(JSSLOT_DEBUG_MEMORY_INSTANCE, NullValue());
+
+ Rooted<NativeObject*> livenessLink(
+ cx, NewObjectWithGivenProto<DebuggerDebuggeeLink>(cx, nullptr));
+ if (!livenessLink) {
+ return false;
+ }
+ obj->setReservedSlot(JSSLOT_DEBUG_DEBUGGEE_LINK, ObjectValue(*livenessLink));
+
+ Debugger* debugger;
+ {
+ // Construct the underlying C++ object.
+ auto dbg = cx->make_unique<Debugger>(cx, obj.get());
+ if (!dbg) {
+ return false;
+ }
+
+ // The object owns the released pointer.
+ debugger = dbg.release();
+ InitReservedSlot(obj, JSSLOT_DEBUG_DEBUGGER, debugger, MemoryUse::Debugger);
+ }
+
+ // Add the initial debuggees, if any.
+ for (unsigned i = 0; i < args.length(); i++) {
+ JSObject& wrappedObj =
+ args[i].toObject().as<ProxyObject>().private_().toObject();
+ Rooted<GlobalObject*> debuggee(cx, &wrappedObj.nonCCWGlobal());
+ if (!debugger->addDebuggeeGlobal(cx, debuggee)) {
+ return false;
+ }
+ }
+
+ args.rval().setObject(*obj);
+ return true;
+}
+
+bool Debugger::addDebuggeeGlobal(JSContext* cx, Handle<GlobalObject*> global) {
+ if (debuggees.has(global)) {
+ return true;
+ }
+
+ // Callers should generally be unable to get a reference to a debugger-
+ // invisible global in order to pass it to addDebuggee. But this is possible
+ // with certain testing aides we expose in the shell, so just make addDebuggee
+ // throw in that case.
+ Realm* debuggeeRealm = global->realm();
+ if (debuggeeRealm->creationOptions().invisibleToDebugger()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_DEBUG_CANT_DEBUG_GLOBAL);
+ return false;
+ }
+
+ // Debugger and debuggee must be in different compartments.
+ if (debuggeeRealm->compartment() == object->compartment()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_DEBUG_SAME_COMPARTMENT);
+ return false;
+ }
+
+ // Check for cycles. If global's realm is reachable from this Debugger
+ // object's realm by following debuggee-to-debugger links, then adding
+ // global would create a cycle. (Typically nobody is debugging the
+ // debugger, in which case we zip through this code without looping.)
+ Vector<Realm*> visited(cx);
+ if (!visited.append(object->realm())) {
+ return false;
+ }
+ for (size_t i = 0; i < visited.length(); i++) {
+ Realm* realm = visited[i];
+ if (realm == debuggeeRealm) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_DEBUG_LOOP);
+ return false;
+ }
+
+ // Find all realms containing debuggers debugging realm's global object.
+ // Add those realms to visited.
+ if (realm->isDebuggee()) {
+ JS::AutoAssertNoGC nogc;
+ for (Realm::DebuggerVectorEntry& entry : realm->getDebuggers(nogc)) {
+ Realm* next = entry.dbg->object->realm();
+ if (std::find(visited.begin(), visited.end(), next) == visited.end()) {
+ if (!visited.append(next)) {
+ return false;
+ }
+ }
+ }
+ }
+ }
+
+ // For global to become this js::Debugger's debuggee:
+ //
+ // 1. this js::Debugger must be in global->getDebuggers(),
+ // 2. global must be in this->debuggees,
+ // 3. the debuggee's zone must be in this->debuggeeZones,
+ // 4. if we are tracking allocations, the SavedStacksMetadataBuilder must be
+ // installed for this realm, and
+ // 5. Realm::isDebuggee()'s bit must be set.
+ //
+ // All five indications must be kept consistent.
+
+ AutoRealm ar(cx, global);
+ Zone* zone = global->zone();
+
+ RootedObject debuggeeLink(cx, getDebuggeeLink());
+ if (!cx->compartment()->wrap(cx, &debuggeeLink)) {
+ return false;
+ }
+
+ // (1)
+ JS::AutoAssertNoGC nogc;
+ auto& globalDebuggers = global->getDebuggers(nogc);
+ if (!globalDebuggers.append(Realm::DebuggerVectorEntry(this, debuggeeLink))) {
+ ReportOutOfMemory(cx);
+ return false;
+ }
+ auto globalDebuggersGuard = MakeScopeExit([&] { globalDebuggers.popBack(); });
+
+ // (2)
+ if (!debuggees.put(global)) {
+ ReportOutOfMemory(cx);
+ return false;
+ }
+ auto debuggeesGuard = MakeScopeExit([&] { debuggees.remove(global); });
+
+ bool addingZoneRelation = !debuggeeZones.has(zone);
+
+ // (3)
+ if (addingZoneRelation && !debuggeeZones.put(zone)) {
+ ReportOutOfMemory(cx);
+ return false;
+ }
+ auto debuggeeZonesGuard = MakeScopeExit([&] {
+ if (addingZoneRelation) {
+ debuggeeZones.remove(zone);
+ }
+ });
+
+ // (4)
+ if (trackingAllocationSites &&
+ !Debugger::addAllocationsTracking(cx, global)) {
+ return false;
+ }
+
+ auto allocationsTrackingGuard = MakeScopeExit([&] {
+ if (trackingAllocationSites) {
+ Debugger::removeAllocationsTracking(*global);
+ }
+ });
+
+ // (5)
+ AutoRestoreRealmDebugMode debugModeGuard(debuggeeRealm);
+ debuggeeRealm->setIsDebuggee();
+ debuggeeRealm->updateDebuggerObservesAsmJS();
+ debuggeeRealm->updateDebuggerObservesWasm();
+ debuggeeRealm->updateDebuggerObservesCoverage();
+ if (observesAllExecution() &&
+ !ensureExecutionObservabilityOfRealm(cx, debuggeeRealm)) {
+ return false;
+ }
+
+ globalDebuggersGuard.release();
+ debuggeesGuard.release();
+ debuggeeZonesGuard.release();
+ allocationsTrackingGuard.release();
+ debugModeGuard.release();
+ return true;
+}
+
+void Debugger::recomputeDebuggeeZoneSet() {
+ AutoEnterOOMUnsafeRegion oomUnsafe;
+ debuggeeZones.clear();
+ for (auto range = debuggees.all(); !range.empty(); range.popFront()) {
+ if (!debuggeeZones.put(range.front().unbarrieredGet()->zone())) {
+ oomUnsafe.crash("Debugger::removeDebuggeeGlobal");
+ }
+ }
+}
+
+template <typename T, typename AP>
+static T* findDebuggerInVector(Debugger* dbg, Vector<T, 0, AP>* vec) {
+ T* p;
+ for (p = vec->begin(); p != vec->end(); p++) {
+ if (p->dbg == dbg) {
+ break;
+ }
+ }
+ MOZ_ASSERT(p != vec->end());
+ return p;
+}
+
+void Debugger::removeDebuggeeGlobal(JS::GCContext* gcx, GlobalObject* global,
+ WeakGlobalObjectSet::Enum* debugEnum,
+ FromSweep fromSweep) {
+ // The caller might have found global by enumerating this->debuggees; if
+ // so, use HashSet::Enum::removeFront rather than HashSet::remove below,
+ // to avoid invalidating the live enumerator.
+ MOZ_ASSERT(debuggees.has(global));
+ MOZ_ASSERT(debuggeeZones.has(global->zone()));
+ MOZ_ASSERT_IF(debugEnum, debugEnum->front().unbarrieredGet() == global);
+
+ // Clear this global's generators from generatorFrames as well.
+ //
+ // This method can be called either from script (dbg.removeDebuggee) or during
+ // GC sweeping, because the Debugger, debuggee global, or both are being GC'd.
+ //
+ // When called from script, it's okay to iterate over generatorFrames and
+ // touch its keys and values (even when an incremental GC is in progress).
+ // When called from GC, it's not okay; the keys and values may be dying. But
+ // in that case, we can actually just skip the loop entirely! If the Debugger
+ // is going away, it doesn't care about the state of its generatorFrames
+ // table, and the Debugger.Frame finalizer will fix up the generator observer
+ // counts.
+ if (fromSweep == FromSweep::No) {
+ for (GeneratorWeakMap::Enum e(generatorFrames); !e.empty(); e.popFront()) {
+ AbstractGeneratorObject& genObj = *e.front().key();
+ if (&genObj.global() == global) {
+ terminateDebuggerFrame(gcx, this, e.front().value(), NullFramePtr(),
+ nullptr, &e);
+ }
+ }
+ }
+
+ for (FrameMap::Enum e(frames); !e.empty(); e.popFront()) {
+ AbstractFramePtr frame = e.front().key();
+ if (frame.hasGlobal(global)) {
+ terminateDebuggerFrame(gcx, this, e.front().value(), frame, &e);
+ }
+ }
+
+ JS::AutoAssertNoGC nogc;
+ auto& globalDebuggersVector = global->getDebuggers(nogc);
+
+ // The relation must be removed from up to three places:
+ // globalDebuggersVector and debuggees for sure, and possibly the
+ // compartment's debuggee set.
+ //
+ // The debuggee zone set is recomputed on demand. This avoids refcounting
+ // and in practice we have relatively few debuggees that tend to all be in
+ // the same zone. If after recomputing the debuggee zone set, this global's
+ // zone is not in the set, then we must remove ourselves from the zone's
+ // vector of observing debuggers.
+ globalDebuggersVector.erase(
+ findDebuggerInVector(this, &globalDebuggersVector));
+
+ if (debugEnum) {
+ debugEnum->removeFront();
+ } else {
+ debuggees.remove(global);
+ }
+
+ recomputeDebuggeeZoneSet();
+
+ // Remove all breakpoints for the debuggee.
+ Breakpoint* nextbp;
+ for (Breakpoint* bp = firstBreakpoint(); bp; bp = nextbp) {
+ nextbp = bp->nextInDebugger();
+
+ if (bp->site->realm() == global->realm()) {
+ bp->remove(gcx);
+ }
+ }
+ MOZ_ASSERT_IF(debuggees.empty(), !firstBreakpoint());
+
+ // If we are tracking allocation sites, we need to remove the object
+ // metadata callback from this global's realm.
+ if (trackingAllocationSites) {
+ Debugger::removeAllocationsTracking(*global);
+ }
+
+ if (!global->realm()->hasDebuggers()) {
+ global->realm()->unsetIsDebuggee();
+ } else {
+ global->realm()->updateDebuggerObservesAllExecution();
+ global->realm()->updateDebuggerObservesAsmJS();
+ global->realm()->updateDebuggerObservesWasm();
+ global->realm()->updateDebuggerObservesCoverage();
+ }
+}
+
+class MOZ_STACK_CLASS Debugger::QueryBase {
+ protected:
+ QueryBase(JSContext* cx, Debugger* dbg)
+ : cx(cx),
+ debugger(dbg),
+ iterMarker(&cx->runtime()->gc),
+ realms(cx->zone()) {}
+
+ // The context in which we should do our work.
+ JSContext* cx;
+
+ // The debugger for which we conduct queries.
+ Debugger* debugger;
+
+ // Require the set of realms to stay fixed while the query is alive.
+ gc::AutoEnterIteration iterMarker;
+
+ using RealmSet = HashSet<Realm*, DefaultHasher<Realm*>, ZoneAllocPolicy>;
+
+ // A script must be in one of these realms to match the query.
+ RealmSet realms;
+
+ // Indicates whether OOM has occurred while matching.
+ bool oom = false;
+
+ bool addRealm(Realm* realm) { return realms.put(realm); }
+
+ // Arrange for this query to match only scripts that run in |global|.
+ bool matchSingleGlobal(GlobalObject* global) {
+ MOZ_ASSERT(realms.count() == 0);
+ if (!addRealm(global->realm())) {
+ ReportOutOfMemory(cx);
+ return false;
+ }
+ return true;
+ }
+
+ // Arrange for this ScriptQuery to match all scripts running in debuggee
+ // globals.
+ bool matchAllDebuggeeGlobals() {
+ MOZ_ASSERT(realms.count() == 0);
+ // Build our realm set from the debugger's set of debuggee globals.
+ for (WeakGlobalObjectSet::Range r = debugger->debuggees.all(); !r.empty();
+ r.popFront()) {
+ if (!addRealm(r.front()->realm())) {
+ ReportOutOfMemory(cx);
+ return false;
+ }
+ }
+ return true;
+ }
+};
+
+/*
+ * A class for parsing 'findScripts' query arguments and searching for
+ * scripts that match the criteria they represent.
+ */
+class MOZ_STACK_CLASS Debugger::ScriptQuery : public Debugger::QueryBase {
+ public:
+ /* Construct a ScriptQuery to use matching scripts for |dbg|. */
+ ScriptQuery(JSContext* cx, Debugger* dbg)
+ : QueryBase(cx, dbg),
+ url(cx),
+ displayURLString(cx),
+ source(cx, AsVariant(static_cast<ScriptSourceObject*>(nullptr))),
+ scriptVector(cx, BaseScriptVector(cx)),
+ partialMatchVector(cx, BaseScriptVector(cx)),
+ wasmInstanceVector(cx, WasmInstanceObjectVector(cx)) {}
+
+ /*
+ * Parse the query object |query|, and prepare to match only the scripts
+ * it specifies.
+ */
+ bool parseQuery(HandleObject query) {
+ // Check for a 'global' property, which limits the results to those
+ // scripts scoped to a particular global object.
+ RootedValue global(cx);
+ if (!GetProperty(cx, query, query, cx->names().global, &global)) {
+ return false;
+ }
+ if (global.isUndefined()) {
+ if (!matchAllDebuggeeGlobals()) {
+ return false;
+ }
+ } else {
+ GlobalObject* globalObject = debugger->unwrapDebuggeeArgument(cx, global);
+ if (!globalObject) {
+ return false;
+ }
+
+ // If the given global isn't a debuggee, just leave the set of
+ // acceptable globals empty; we'll return no scripts.
+ if (debugger->debuggees.has(globalObject)) {
+ if (!matchSingleGlobal(globalObject)) {
+ return false;
+ }
+ }
+ }
+
+ // Check for a 'url' property.
+ if (!GetProperty(cx, query, query, cx->names().url, &url)) {
+ return false;
+ }
+ if (!url.isUndefined() && !url.isString()) {
+ JS_ReportErrorNumberASCII(
+ cx, GetErrorMessage, nullptr, JSMSG_UNEXPECTED_TYPE,
+ "query object's 'url' property", "neither undefined nor a string");
+ return false;
+ }
+
+ // Check for a 'source' property
+ RootedValue debuggerSource(cx);
+ if (!GetProperty(cx, query, query, cx->names().source, &debuggerSource)) {
+ return false;
+ }
+ if (!debuggerSource.isUndefined()) {
+ if (!debuggerSource.isObject() ||
+ !debuggerSource.toObject().is<DebuggerSource>()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_UNEXPECTED_TYPE,
+ "query object's 'source' property",
+ "not undefined nor a Debugger.Source object");
+ return false;
+ }
+
+ DebuggerSource& debuggerSourceObj =
+ debuggerSource.toObject().as<DebuggerSource>();
+
+ // If it does have an owner, it should match the Debugger we're
+ // calling findScripts on. It would work fine even if it didn't,
+ // but mixing Debugger.Sources is probably a sign of confusion.
+ if (debuggerSourceObj.owner() != debugger) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_DEBUG_WRONG_OWNER, "Debugger.Source");
+ return false;
+ }
+
+ hasSource = true;
+ source = debuggerSourceObj.getReferent();
+ }
+
+ // Check for a 'displayURL' property.
+ RootedValue displayURL(cx);
+ if (!GetProperty(cx, query, query, cx->names().displayURL, &displayURL)) {
+ return false;
+ }
+ if (!displayURL.isUndefined() && !displayURL.isString()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_UNEXPECTED_TYPE,
+ "query object's 'displayURL' property",
+ "neither undefined nor a string");
+ return false;
+ }
+
+ if (displayURL.isString()) {
+ displayURLString = displayURL.toString()->ensureLinear(cx);
+ if (!displayURLString) {
+ return false;
+ }
+ }
+
+ // Check for a 'line' property.
+ RootedValue lineProperty(cx);
+ if (!GetProperty(cx, query, query, cx->names().line, &lineProperty)) {
+ return false;
+ }
+ if (lineProperty.isUndefined()) {
+ hasLine = false;
+ } else if (lineProperty.isNumber()) {
+ if (displayURL.isUndefined() && url.isUndefined() && !hasSource) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_QUERY_LINE_WITHOUT_URL);
+ return false;
+ }
+ double doubleLine = lineProperty.toNumber();
+ uint32_t uintLine = (uint32_t)doubleLine;
+ if (doubleLine <= 0 || uintLine != doubleLine) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_DEBUG_BAD_LINE);
+ return false;
+ }
+ hasLine = true;
+ line = uintLine;
+ } else {
+ JS_ReportErrorNumberASCII(
+ cx, GetErrorMessage, nullptr, JSMSG_UNEXPECTED_TYPE,
+ "query object's 'line' property", "neither undefined nor an integer");
+ return false;
+ }
+
+ // Check for an 'innermost' property.
+ PropertyName* innermostName = cx->names().innermost;
+ RootedValue innermostProperty(cx);
+ if (!GetProperty(cx, query, query, innermostName, &innermostProperty)) {
+ return false;
+ }
+ innermost = ToBoolean(innermostProperty);
+ if (innermost) {
+ // Technically, we need only check hasLine, but this is clearer.
+ if ((displayURL.isUndefined() && url.isUndefined() && !hasSource) ||
+ !hasLine) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_QUERY_INNERMOST_WITHOUT_LINE_URL);
+ return false;
+ }
+ }
+
+ return true;
+ }
+
+ /* Set up this ScriptQuery appropriately for a missing query argument. */
+ bool omittedQuery() {
+ url.setUndefined();
+ hasLine = false;
+ innermost = false;
+ displayURLString = nullptr;
+ return matchAllDebuggeeGlobals();
+ }
+
+ /*
+ * Search all relevant realms and the stack for scripts matching
+ * this query, and append the matching scripts to |scriptVector|.
+ */
+ bool findScripts() {
+ if (!prepareQuery()) {
+ return false;
+ }
+
+ Realm* singletonRealm = nullptr;
+ if (realms.count() == 1) {
+ singletonRealm = realms.all().front();
+ }
+
+ // Search each realm for debuggee scripts.
+ MOZ_ASSERT(scriptVector.empty());
+ MOZ_ASSERT(partialMatchVector.empty());
+ oom = false;
+ IterateScripts(cx, singletonRealm, this, considerScript);
+ if (oom) {
+ ReportOutOfMemory(cx);
+ return false;
+ }
+
+ // If we are filtering by line number, the lazy BaseScripts were not checked
+ // yet since they do not implement `GetScriptLineExtent`. Instead we revisit
+ // each result script and delazify its children and add any matching ones to
+ // the results list.
+ MOZ_ASSERT(hasLine || partialMatchVector.empty());
+ Rooted<BaseScript*> script(cx);
+ RootedFunction fun(cx);
+ while (!partialMatchVector.empty()) {
+ script = partialMatchVector.popCopy();
+
+ // As a performance optimization, we can skip scripts that are definitely
+ // out-of-bounds for the target line. This was checked before adding to
+ // the partialMatchVector, but the bound may have improved since then.
+ if (script->extent().sourceEnd <= sourceOffsetLowerBound) {
+ continue;
+ }
+
+ MOZ_ASSERT(script->isFunction());
+ MOZ_ASSERT(script->isReadyForDelazification());
+
+ fun = script->function();
+
+ // Ignore any delazification placeholder functions. These should not be
+ // exposed to debugger in any way.
+ if (fun->isGhost()) {
+ continue;
+ }
+
+ // Delazify script.
+ JSScript* compiledScript = GetOrCreateFunctionScript(cx, fun);
+ if (!compiledScript) {
+ return false;
+ }
+
+ // If target line isn't in script, we are done with it.
+ if (!scriptIsLineMatch(compiledScript)) {
+ continue;
+ }
+
+ // Add script to results now that we've completed checks.
+ if (!scriptVector.append(compiledScript)) {
+ return false;
+ }
+
+ // If script was a leaf we are done with it. This is an optional
+ // optimization to avoid inspecting the `gcthings` list below.
+ if (!script->hasInnerFunctions()) {
+ continue;
+ }
+
+ // Now add inner scripts to `partialMatchVector` work list to determine if
+ // they are matches. Note that out IterateScripts callback ignored them
+ // already since they did not have a compiled parent at the time.
+ for (JS::GCCellPtr thing : script->gcthings()) {
+ if (!thing.is<JSObject>() || !thing.as<JSObject>().is<JSFunction>()) {
+ continue;
+ }
+ JSFunction* fun = &thing.as<JSObject>().as<JSFunction>();
+ if (!fun->hasBaseScript()) {
+ continue;
+ }
+ BaseScript* inner = fun->baseScript();
+ MOZ_ASSERT(inner);
+ if (!inner) {
+ // If the function doesn't have script, ignore it.
+ continue;
+ }
+
+ if (!scriptIsPartialLineMatch(inner)) {
+ continue;
+ }
+
+ // Add the matching inner script to the back of the results queue
+ // where it will be processed recursively.
+ if (!partialMatchVector.append(inner)) {
+ return false;
+ }
+ }
+ }
+
+ // If this is an 'innermost' query, we want to filter the results again to
+ // only return the innermost script for each realm. To do this we build a
+ // hashmap to track innermost and then recreate the `scriptVector` with the
+ // results that remain in the hashmap.
+ if (innermost) {
+ using RealmToScriptMap =
+ GCHashMap<Realm*, BaseScript*, DefaultHasher<Realm*>>;
+
+ Rooted<RealmToScriptMap> innermostForRealm(cx, cx);
+
+ // Visit each candidate script and find innermost in each realm.
+ for (BaseScript* script : scriptVector) {
+ Realm* realm = script->realm();
+ RealmToScriptMap::AddPtr p = innermostForRealm.lookupForAdd(realm);
+ if (p) {
+ // Is our newly found script deeper than the last one we found?
+ BaseScript* incumbent = p->value();
+ if (script->asJSScript()->innermostScope()->chainLength() >
+ incumbent->asJSScript()->innermostScope()->chainLength()) {
+ p->value() = script;
+ }
+ } else {
+ // This is the first matching script we've encountered for this
+ // realm, so it is thus the innermost such script.
+ if (!innermostForRealm.add(p, realm, script)) {
+ return false;
+ }
+ }
+ }
+
+ // Reset the results vector.
+ scriptVector.clear();
+
+ // Re-add only the innermost scripts to the results.
+ for (RealmToScriptMap::Range r = innermostForRealm.all(); !r.empty();
+ r.popFront()) {
+ if (!scriptVector.append(r.front().value())) {
+ return false;
+ }
+ }
+ }
+
+ // TODO: Until such time that wasm modules are real ES6 modules,
+ // unconditionally consider all wasm toplevel instance scripts.
+ for (WeakGlobalObjectSet::Range r = debugger->allDebuggees(); !r.empty();
+ r.popFront()) {
+ for (wasm::Instance* instance : r.front()->realm()->wasm.instances()) {
+ consider(instance->object());
+ if (oom) {
+ ReportOutOfMemory(cx);
+ return false;
+ }
+ }
+ }
+
+ return true;
+ }
+
+ Handle<BaseScriptVector> foundScripts() const { return scriptVector; }
+
+ Handle<WasmInstanceObjectVector> foundWasmInstances() const {
+ return wasmInstanceVector;
+ }
+
+ private:
+ /* If this is a string, matching scripts have urls equal to it. */
+ RootedValue url;
+
+ /* url as a C string. */
+ UniqueChars urlCString;
+
+ /* If this is a string, matching scripts' sources have displayURLs equal to
+ * it. */
+ Rooted<JSLinearString*> displayURLString;
+
+ /*
+ * If this is a source referent, matching scripts will have sources equal
+ * to this instance. Ideally we'd use a Maybe here, but Maybe interacts
+ * very badly with Rooted's LIFO invariant.
+ */
+ bool hasSource = false;
+ Rooted<DebuggerSourceReferent> source;
+
+ /* True if the query contained a 'line' property. */
+ bool hasLine = false;
+
+ /* The line matching scripts must cover. */
+ uint32_t line = 0;
+
+ // As a performance optimization (and to avoid delazifying as many scripts),
+ // we would like to know the source offset of the target line.
+ //
+ // Since we do not have a simple way to compute this precisely, we instead
+ // track a lower-bound of the offset value. As we collect SourceExtent
+ // examples with (line,column) <-> sourceStart mappings, we can improve the
+ // bound. The target line is within the range [sourceOffsetLowerBound, Inf).
+ //
+ // NOTE: Using a SourceExtent for updating the bound happens independently of
+ // if the script matches the target line or not in the in the end.
+ mutable uint32_t sourceOffsetLowerBound = 0;
+
+ /* True if the query has an 'innermost' property whose value is true. */
+ bool innermost = false;
+
+ /*
+ * Accumulate the scripts in an Rooted<BaseScriptVector> instead of creating
+ * the JS array as we go, because we mustn't allocate JS objects or GC while
+ * we use the CellIter.
+ */
+ Rooted<BaseScriptVector> scriptVector;
+
+ /*
+ * While in the CellIter we may find BaseScripts that need to be compiled
+ * before the query can be fully checked. Since we cannot compile while under
+ * CellIter we accumulate them here instead.
+ *
+ * This occurs when matching line numbers since `GetScriptLineExtent` cannot
+ * be computed without bytecode existing.
+ */
+ Rooted<BaseScriptVector> partialMatchVector;
+
+ /*
+ * Like above, but for wasm modules.
+ */
+ Rooted<WasmInstanceObjectVector> wasmInstanceVector;
+
+ /*
+ * Given that parseQuery or omittedQuery has been called, prepare to match
+ * scripts. Set urlCString and displayURLChars as appropriate.
+ */
+ bool prepareQuery() {
+ // Compute urlCString and displayURLChars, if a url or displayURL was
+ // given respectively.
+ if (url.isString()) {
+ Rooted<JSString*> str(cx, url.toString());
+ urlCString = JS_EncodeStringToUTF8(cx, str);
+ if (!urlCString) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+
+ void updateSourceOffsetLowerBound(const SourceExtent& extent) {
+ // We trying to find the offset of (target-line, 0) so just ignore any
+ // extents on target line to keep things simple.
+ MOZ_ASSERT(extent.lineno <= line);
+ if (extent.lineno == line) {
+ return;
+ }
+
+ // The extent.sourceStart position is now definitely *before* the target
+ // line, so update sourceOffsetLowerBound if extent.sourceStart is a tighter
+ // bound.
+ if (extent.sourceStart > sourceOffsetLowerBound) {
+ sourceOffsetLowerBound = extent.sourceStart;
+ }
+ }
+
+ // A partial match is a script that starts before the target line, but may or
+ // may not end before it. If we can prove the script definitely ends before
+ // the target line, we may return false here.
+ bool scriptIsPartialLineMatch(BaseScript* script) {
+ const SourceExtent& extent = script->extent();
+
+ // Check that start of script is before or on target line.
+ if (extent.lineno > line) {
+ return false;
+ }
+
+ // Use the implicit (line, column) <-> sourceStart mapping from the
+ // SourceExtent to update our bounds on possible matches. We call this
+ // without knowing if the script is a match or not.
+ updateSourceOffsetLowerBound(script->extent());
+
+ // As an optional performance optimization, we rule out any script that ends
+ // before the lower-bound on where target line exists.
+ return extent.sourceEnd > sourceOffsetLowerBound;
+ }
+
+ // True if any part of script source is on the target line.
+ bool scriptIsLineMatch(JSScript* script) {
+ MOZ_ASSERT(scriptIsPartialLineMatch(script));
+
+ uint32_t lineCount = GetScriptLineExtent(script);
+ return (script->lineno() + lineCount > line);
+ }
+
+ static void considerScript(JSRuntime* rt, void* data, BaseScript* script,
+ const JS::AutoRequireNoGC& nogc) {
+ ScriptQuery* self = static_cast<ScriptQuery*>(data);
+ self->consider(script, nogc);
+ }
+
+ template <typename T>
+ [[nodiscard]] bool commonFilter(T script, const JS::AutoRequireNoGC& nogc) {
+ if (urlCString) {
+ bool gotFilename = false;
+ if (script->filename() &&
+ strcmp(script->filename(), urlCString.get()) == 0) {
+ gotFilename = true;
+ }
+
+ bool gotSourceURL = false;
+ if (!gotFilename && script->scriptSource()->introducerFilename() &&
+ strcmp(script->scriptSource()->introducerFilename(),
+ urlCString.get()) == 0) {
+ gotSourceURL = true;
+ }
+ if (!gotFilename && !gotSourceURL) {
+ return false;
+ }
+ }
+ if (displayURLString) {
+ if (!script->scriptSource() || !script->scriptSource()->hasDisplayURL()) {
+ return false;
+ }
+
+ const char16_t* s = script->scriptSource()->displayURL();
+ if (CompareChars(s, js_strlen(s), displayURLString) != 0) {
+ return false;
+ }
+ }
+ if (hasSource && !(source.is<ScriptSourceObject*>() &&
+ source.as<ScriptSourceObject*>()->source() ==
+ script->scriptSource())) {
+ return false;
+ }
+ return true;
+ }
+
+ /*
+ * If |script| matches this query, append it to |scriptVector|. Set |oom| if
+ * an out of memory condition occurred.
+ */
+ void consider(BaseScript* script, const JS::AutoRequireNoGC& nogc) {
+ if (oom || script->selfHosted()) {
+ return;
+ }
+
+ Realm* realm = script->realm();
+ if (!realms.has(realm)) {
+ return;
+ }
+
+ if (!commonFilter(script, nogc)) {
+ return;
+ }
+
+ bool partial = false;
+
+ if (hasLine) {
+ if (!scriptIsPartialLineMatch(script)) {
+ return;
+ }
+
+ if (script->hasBytecode()) {
+ // Check if line is within script (or any of its inner scripts).
+ if (!scriptIsLineMatch(script->asJSScript())) {
+ return;
+ }
+ } else {
+ // GetScriptLineExtent is not available on lazy scripts so instead to
+ // the partial match list for be compiled and reprocessed later. We only
+ // add scripts that are ready for delazification and they may in turn
+ // process their inner functions.
+ if (!script->isReadyForDelazification()) {
+ return;
+ }
+ partial = true;
+ }
+ }
+
+ // If innermost filter is required, we collect everything that matches the
+ // line number and filter at the end of `findScripts`.
+ MOZ_ASSERT_IF(innermost, hasLine);
+
+ Rooted<BaseScriptVector>& vec = partial ? partialMatchVector : scriptVector;
+ if (!vec.append(script)) {
+ oom = true;
+ }
+ }
+
+ /*
+ * If |instanceObject| matches this query, append it to |wasmInstanceVector|.
+ * Set |oom| if an out of memory condition occurred.
+ */
+ void consider(WasmInstanceObject* instanceObject) {
+ if (oom) {
+ return;
+ }
+
+ if (hasSource && source != AsVariant(instanceObject)) {
+ return;
+ }
+
+ if (!wasmInstanceVector.append(instanceObject)) {
+ oom = true;
+ }
+ }
+};
+
+bool Debugger::CallData::findScripts() {
+ ScriptQuery query(cx, dbg);
+
+ if (args.length() >= 1) {
+ RootedObject queryObject(cx, RequireObject(cx, args[0]));
+ if (!queryObject || !query.parseQuery(queryObject)) {
+ return false;
+ }
+ } else {
+ if (!query.omittedQuery()) {
+ return false;
+ }
+ }
+
+ if (!query.findScripts()) {
+ return false;
+ }
+
+ Handle<BaseScriptVector> scripts(query.foundScripts());
+ Handle<WasmInstanceObjectVector> wasmInstances(query.foundWasmInstances());
+
+ size_t resultLength = scripts.length() + wasmInstances.length();
+ Rooted<ArrayObject*> result(cx,
+ NewDenseFullyAllocatedArray(cx, resultLength));
+ if (!result) {
+ return false;
+ }
+
+ result->ensureDenseInitializedLength(0, resultLength);
+
+ for (size_t i = 0; i < scripts.length(); i++) {
+ JSObject* scriptObject = dbg->wrapScript(cx, scripts[i]);
+ if (!scriptObject) {
+ return false;
+ }
+ result->setDenseElement(i, ObjectValue(*scriptObject));
+ }
+
+ size_t wasmStart = scripts.length();
+ for (size_t i = 0; i < wasmInstances.length(); i++) {
+ JSObject* scriptObject = dbg->wrapWasmScript(cx, wasmInstances[i]);
+ if (!scriptObject) {
+ return false;
+ }
+ result->setDenseElement(wasmStart + i, ObjectValue(*scriptObject));
+ }
+
+ args.rval().setObject(*result);
+ return true;
+}
+
+/*
+ * A class for searching sources for 'findSources'.
+ */
+class MOZ_STACK_CLASS Debugger::SourceQuery : public Debugger::QueryBase {
+ public:
+ using SourceSet = JS::GCHashSet<JSObject*, js::StableCellHasher<JSObject*>,
+ ZoneAllocPolicy>;
+
+ SourceQuery(JSContext* cx, Debugger* dbg)
+ : QueryBase(cx, dbg), sources(cx, SourceSet(cx->zone())) {}
+
+ bool findSources() {
+ if (!matchAllDebuggeeGlobals()) {
+ return false;
+ }
+
+ Realm* singletonRealm = nullptr;
+ if (realms.count() == 1) {
+ singletonRealm = realms.all().front();
+ }
+
+ // Search each realm for debuggee scripts.
+ MOZ_ASSERT(sources.empty());
+ oom = false;
+ IterateScripts(cx, singletonRealm, this, considerScript);
+ if (oom) {
+ ReportOutOfMemory(cx);
+ return false;
+ }
+
+ // TODO: Until such time that wasm modules are real ES6 modules,
+ // unconditionally consider all wasm toplevel instance scripts.
+ for (WeakGlobalObjectSet::Range r = debugger->allDebuggees(); !r.empty();
+ r.popFront()) {
+ for (wasm::Instance* instance : r.front()->realm()->wasm.instances()) {
+ consider(instance->object());
+ if (oom) {
+ ReportOutOfMemory(cx);
+ return false;
+ }
+ }
+ }
+
+ return true;
+ }
+
+ Handle<SourceSet> foundSources() const { return sources; }
+
+ private:
+ Rooted<SourceSet> sources;
+
+ static void considerScript(JSRuntime* rt, void* data, BaseScript* script,
+ const JS::AutoRequireNoGC& nogc) {
+ SourceQuery* self = static_cast<SourceQuery*>(data);
+ self->consider(script, nogc);
+ }
+
+ void consider(BaseScript* script, const JS::AutoRequireNoGC& nogc) {
+ if (oom || script->selfHosted()) {
+ return;
+ }
+
+ Realm* realm = script->realm();
+ if (!realms.has(realm)) {
+ return;
+ }
+
+ ScriptSourceObject* source = script->sourceObject();
+ if (!sources.put(source)) {
+ oom = true;
+ }
+ }
+
+ void consider(WasmInstanceObject* instanceObject) {
+ if (oom) {
+ return;
+ }
+
+ if (!sources.put(instanceObject)) {
+ oom = true;
+ }
+ }
+};
+
+static inline DebuggerSourceReferent AsSourceReferent(JSObject* obj) {
+ if (obj->is<ScriptSourceObject>()) {
+ return AsVariant(&obj->as<ScriptSourceObject>());
+ }
+ return AsVariant(&obj->as<WasmInstanceObject>());
+}
+
+bool Debugger::CallData::findSources() {
+ SourceQuery query(cx, dbg);
+ if (!query.findSources()) {
+ return false;
+ }
+
+ Handle<SourceQuery::SourceSet> sources(query.foundSources());
+
+ size_t resultLength = sources.count();
+ Rooted<ArrayObject*> result(cx,
+ NewDenseFullyAllocatedArray(cx, resultLength));
+ if (!result) {
+ return false;
+ }
+
+ result->ensureDenseInitializedLength(0, resultLength);
+
+ size_t i = 0;
+ for (auto iter = sources.get().iter(); !iter.done(); iter.next()) {
+ Rooted<DebuggerSourceReferent> sourceReferent(cx,
+ AsSourceReferent(iter.get()));
+ RootedObject sourceObject(cx, dbg->wrapVariantReferent(cx, sourceReferent));
+ if (!sourceObject) {
+ return false;
+ }
+ result->setDenseElement(i, ObjectValue(*sourceObject));
+ i++;
+ }
+
+ args.rval().setObject(*result);
+ return true;
+}
+
+/*
+ * A class for parsing 'findObjects' query arguments and searching for objects
+ * that match the criteria they represent.
+ */
+class MOZ_STACK_CLASS Debugger::ObjectQuery {
+ public:
+ /* Construct an ObjectQuery to use matching scripts for |dbg|. */
+ ObjectQuery(JSContext* cx, Debugger* dbg)
+ : objects(cx), cx(cx), dbg(dbg), className(cx) {}
+
+ /* The vector that we are accumulating results in. */
+ RootedObjectVector objects;
+
+ /* The set of debuggee compartments. */
+ JS::CompartmentSet debuggeeCompartments;
+
+ /*
+ * Parse the query object |query|, and prepare to match only the objects it
+ * specifies.
+ */
+ bool parseQuery(HandleObject query) {
+ // Check for the 'class' property
+ RootedValue cls(cx);
+ if (!GetProperty(cx, query, query, cx->names().class_, &cls)) {
+ return false;
+ }
+ if (!cls.isUndefined()) {
+ if (!cls.isString()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_UNEXPECTED_TYPE,
+ "query object's 'class' property",
+ "neither undefined nor a string");
+ return false;
+ }
+ JSLinearString* str = cls.toString()->ensureLinear(cx);
+ if (!str) {
+ return false;
+ }
+ if (!StringIsAscii(str)) {
+ JS_ReportErrorNumberASCII(
+ cx, GetErrorMessage, nullptr, JSMSG_UNEXPECTED_TYPE,
+ "query object's 'class' property",
+ "not a string containing only ASCII characters");
+ return false;
+ }
+ className = cls;
+ }
+ return true;
+ }
+
+ /* Set up this ObjectQuery appropriately for a missing query argument. */
+ void omittedQuery() { className.setUndefined(); }
+
+ /*
+ * Traverse the heap to find all relevant objects and add them to the
+ * provided vector.
+ */
+ bool findObjects() {
+ if (!prepareQuery()) {
+ return false;
+ }
+
+ for (WeakGlobalObjectSet::Range r = dbg->allDebuggees(); !r.empty();
+ r.popFront()) {
+ if (!debuggeeCompartments.put(r.front()->compartment())) {
+ ReportOutOfMemory(cx);
+ return false;
+ }
+ }
+
+ {
+ // We can't tolerate the GC moving things around while we're
+ // searching the heap. Check that nothing we do causes a GC.
+ RootedObject dbgObj(cx, dbg->object);
+ JS::ubi::RootList rootList(cx);
+ auto [ok, nogc] = rootList.init(dbgObj);
+ if (!ok) {
+ ReportOutOfMemory(cx);
+ return false;
+ }
+
+ Traversal traversal(cx, *this, nogc);
+ traversal.wantNames = false;
+
+ return traversal.addStart(JS::ubi::Node(&rootList)) &&
+ traversal.traverse();
+ }
+ }
+
+ /*
+ * |ubi::Node::BreadthFirst| interface.
+ */
+ class NodeData {};
+ using Traversal = JS::ubi::BreadthFirst<ObjectQuery>;
+ bool operator()(Traversal& traversal, JS::ubi::Node origin,
+ const JS::ubi::Edge& edge, NodeData*, bool first) {
+ if (!first) {
+ return true;
+ }
+
+ JS::ubi::Node referent = edge.referent;
+
+ // Only follow edges within our set of debuggee compartments; we don't
+ // care about the heap's subgraphs outside of our debuggee compartments,
+ // so we abandon the referent. Either (1) there is not a path from this
+ // non-debuggee node back to a node in our debuggee compartments, and we
+ // don't need to follow edges to or from this node, or (2) there does
+ // exist some path from this non-debuggee node back to a node in our
+ // debuggee compartments. However, if that were true, then the incoming
+ // cross compartment edge back into a debuggee compartment is already
+ // listed as an edge in the RootList we started traversal with, and
+ // therefore we don't need to follow edges to or from this non-debuggee
+ // node.
+ JS::Compartment* comp = referent.compartment();
+ if (comp && !debuggeeCompartments.has(comp)) {
+ traversal.abandonReferent();
+ return true;
+ }
+
+ // If the referent has an associated realm and it's not a debuggee
+ // realm, skip it. Don't abandonReferent() here like above: realms
+ // within a compartment can reference each other without going through
+ // cross-compartment wrappers.
+ Realm* realm = referent.realm();
+ if (realm && !dbg->isDebuggeeUnbarriered(realm)) {
+ return true;
+ }
+
+ // If the referent is an object and matches our query's restrictions,
+ // add it to the vector accumulating results. Skip objects that should
+ // never be exposed to JS, like EnvironmentObjects and internal
+ // functions.
+
+ if (!referent.is<JSObject>() || referent.exposeToJS().isUndefined()) {
+ return true;
+ }
+
+ JSObject* obj = referent.as<JSObject>();
+
+ if (!className.isUndefined()) {
+ const char* objClassName = obj->getClass()->name;
+ if (strcmp(objClassName, classNameCString.get()) != 0) {
+ return true;
+ }
+ }
+
+ return objects.append(obj);
+ }
+
+ private:
+ /* The context in which we should do our work. */
+ JSContext* cx;
+
+ /* The debugger for which we conduct queries. */
+ Debugger* dbg;
+
+ /*
+ * If this is non-null, matching objects will have a class whose name is
+ * this property.
+ */
+ RootedValue className;
+
+ /* The className member, as a C string. */
+ UniqueChars classNameCString;
+
+ /*
+ * Given that either omittedQuery or parseQuery has been called, prepare the
+ * query for matching objects.
+ */
+ bool prepareQuery() {
+ if (className.isString()) {
+ classNameCString = JS_EncodeStringToASCII(cx, className.toString());
+ if (!classNameCString) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+};
+
+bool Debugger::CallData::findObjects() {
+ ObjectQuery query(cx, dbg);
+
+ if (args.length() >= 1) {
+ RootedObject queryObject(cx, RequireObject(cx, args[0]));
+ if (!queryObject || !query.parseQuery(queryObject)) {
+ return false;
+ }
+ } else {
+ query.omittedQuery();
+ }
+
+ if (!query.findObjects()) {
+ return false;
+ }
+
+ // Returning internal objects (such as self-hosting intrinsics) to JS is not
+ // fuzzing-safe. We still want to call parseQuery/findObjects when fuzzing so
+ // just clear the Vector here.
+ if (fuzzingSafe) {
+ query.objects.clear();
+ }
+
+ size_t length = query.objects.length();
+ Rooted<ArrayObject*> result(cx, NewDenseFullyAllocatedArray(cx, length));
+ if (!result) {
+ return false;
+ }
+
+ result->ensureDenseInitializedLength(0, length);
+
+ for (size_t i = 0; i < length; i++) {
+ RootedValue debuggeeVal(cx, ObjectValue(*query.objects[i]));
+ if (!dbg->wrapDebuggeeValue(cx, &debuggeeVal)) {
+ return false;
+ }
+ result->setDenseElement(i, debuggeeVal);
+ }
+
+ args.rval().setObject(*result);
+ return true;
+}
+
+bool Debugger::CallData::findAllGlobals() {
+ RootedObjectVector globals(cx);
+
+ {
+ // Accumulate the list of globals before wrapping them, because
+ // wrapping can GC and collect realms from under us, while iterating.
+ JS::AutoCheckCannotGC nogc;
+
+ for (RealmsIter r(cx->runtime()); !r.done(); r.next()) {
+ if (r->creationOptions().invisibleToDebugger()) {
+ continue;
+ }
+
+ if (!r->hasInitializedGlobal()) {
+ continue;
+ }
+
+ if (JS::RealmBehaviorsRef(r).isNonLive()) {
+ continue;
+ }
+
+ r->compartment()->gcState.scheduledForDestruction = false;
+
+ GlobalObject* global = r->maybeGlobal();
+
+ // We pulled |global| out of nowhere, so it's possible that it was
+ // marked gray by XPConnect. Since we're now exposing it to JS code,
+ // we need to mark it black.
+ JS::ExposeObjectToActiveJS(global);
+ if (!globals.append(global)) {
+ return false;
+ }
+ }
+ }
+
+ RootedObject result(cx, NewDenseEmptyArray(cx));
+ if (!result) {
+ return false;
+ }
+
+ for (size_t i = 0; i < globals.length(); i++) {
+ RootedValue globalValue(cx, ObjectValue(*globals[i]));
+ if (!dbg->wrapDebuggeeValue(cx, &globalValue)) {
+ return false;
+ }
+ if (!NewbornArrayPush(cx, result, globalValue)) {
+ return false;
+ }
+ }
+
+ args.rval().setObject(*result);
+ return true;
+}
+
+bool Debugger::CallData::findSourceURLs() {
+ RootedObject result(cx, NewDenseEmptyArray(cx));
+ if (!result) {
+ return false;
+ }
+
+ for (WeakGlobalObjectSet::Range r = dbg->allDebuggees(); !r.empty();
+ r.popFront()) {
+ RootedObject holder(cx, r.front()->getSourceURLsHolder());
+ if (holder) {
+ for (size_t i = 0; i < holder->as<ArrayObject>().length(); i++) {
+ Value v = holder->as<ArrayObject>().getDenseElement(i);
+
+ // The value is an atom and doesn't need wrapping, but the holder may be
+ // in another zone and the atom must be marked when we create a
+ // reference in this zone.
+ MOZ_ASSERT(v.isString() && v.toString()->isAtom());
+ cx->markAtomValue(v);
+
+ if (!NewbornArrayPush(cx, result, v)) {
+ return false;
+ }
+ }
+ }
+ }
+
+ args.rval().setObject(*result);
+ return true;
+}
+
+bool Debugger::CallData::makeGlobalObjectReference() {
+ if (!args.requireAtLeast(cx, "Debugger.makeGlobalObjectReference", 1)) {
+ return false;
+ }
+
+ Rooted<GlobalObject*> global(cx, dbg->unwrapDebuggeeArgument(cx, args[0]));
+ if (!global) {
+ return false;
+ }
+
+ // If we create a D.O referring to a global in an invisible realm,
+ // then from it we can reach function objects, scripts, environments, etc.,
+ // none of which we're ever supposed to see.
+ if (global->realm()->creationOptions().invisibleToDebugger()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
+ JSMSG_DEBUG_INVISIBLE_COMPARTMENT);
+ return false;
+ }
+
+ args.rval().setObject(*global);
+ return dbg->wrapDebuggeeValue(cx, args.rval());
+}
+
+bool Debugger::isCompilableUnit(JSContext* cx, unsigned argc, Value* vp) {
+ CallArgs args = CallArgsFromVp(argc, vp);
+
+ if (!args.requireAtLeast(cx, "Debugger.isCompilableUnit", 1)) {
+ return false;
+ }
+
+ if (!args[0].isString()) {
+ JS_ReportErrorNumberASCII(
+ cx, GetErrorMessage, nullptr, JSMSG_NOT_EXPECTED_TYPE,
+ "Debugger.isCompilableUnit", "string", InformalValueTypeName(args[0]));
+ return false;
+ }
+
+ JSString* str = args[0].toString();
+ size_t length = str->length();
+
+ AutoStableStringChars chars(cx);
+ if (!chars.initTwoByte(cx, str)) {
+ return false;
+ }
+
+ bool result = true;
+
+ AutoReportFrontendContext fc(cx,
+ AutoReportFrontendContext::Warning::Suppress);
+ CompileOptions options(cx);
+ Rooted<frontend::CompilationInput> input(cx,
+ frontend::CompilationInput(options));
+ if (!input.get().initForGlobal(&fc)) {
+ return false;
+ }
+
+ LifoAllocScope allocScope(&cx->tempLifoAlloc());
+ frontend::NoScopeBindingCache scopeCache;
+ frontend::CompilationState compilationState(&fc, allocScope, input.get());
+ if (!compilationState.init(&fc, &scopeCache)) {
+ return false;
+ }
+
+ frontend::Parser<frontend::FullParseHandler, char16_t> parser(
+ &fc, options, chars.twoByteChars(), length,
+ /* foldConstants = */ true, compilationState,
+ /* syntaxParser = */ nullptr);
+ if (!parser.checkOptions() || !parser.parse()) {
+ // We ran into an error. If it was because we ran out of memory we report
+ // it in the usual way.
+ if (fc.hadOutOfMemory()) {
+ return false;
+ }
+
+ // If it was because we ran out of source, we return false so our caller
+ // knows to try to collect more [source].
+ if (parser.isUnexpectedEOF()) {
+ result = false;
+ }
+
+ fc.clearAutoReport();
+ }
+
+ args.rval().setBoolean(result);
+ return true;
+}
+
+bool Debugger::CallData::adoptDebuggeeValue() {
+ if (!args.requireAtLeast(cx, "Debugger.adoptDebuggeeValue", 1)) {
+ return false;
+ }
+
+ RootedValue v(cx, args[0]);
+ if (v.isObject()) {
+ RootedObject obj(cx, &v.toObject());
+ DebuggerObject* ndobj = ToNativeDebuggerObject(cx, &obj);
+ if (!ndobj) {
+ return false;
+ }
+
+ obj.set(ndobj->referent());
+ v = ObjectValue(*obj);
+
+ if (!dbg->wrapDebuggeeValue(cx, &v)) {
+ return false;
+ }
+ }
+
+ args.rval().set(v);
+ return true;
+}
+
+class DebuggerAdoptSourceMatcher {
+ JSContext* cx_;
+ Debugger* dbg_;
+
+ public:
+ explicit DebuggerAdoptSourceMatcher(JSContext* cx, Debugger* dbg)
+ : cx_(cx), dbg_(dbg) {}
+
+ using ReturnType = DebuggerSource*;
+
+ ReturnType match(Handle<ScriptSourceObject*> source) {
+ if (source->compartment() == cx_->compartment()) {
+ JS_ReportErrorASCII(cx_,
+ "Source is in the same compartment as this debugger");
+ return nullptr;
+ }
+ return dbg_->wrapSource(cx_, source);
+ }
+ ReturnType match(Handle<WasmInstanceObject*> wasmInstance) {
+ if (wasmInstance->compartment() == cx_->compartment()) {
+ JS_ReportErrorASCII(
+ cx_, "WasmInstance is in the same compartment as this debugger");
+ return nullptr;
+ }
+ return dbg_->wrapWasmSource(cx_, wasmInstance);
+ }
+};
+
+bool Debugger::CallData::adoptFrame() {
+ if (!args.requireAtLeast(cx, "Debugger.adoptFrame", 1)) {
+ return false;
+ }
+
+ RootedObject obj(cx, RequireObject(cx, args[0]));
+ if (!obj) {
+ return false;
+ }
+
+ obj = UncheckedUnwrap(obj);
+ if (!obj->is<DebuggerFrame>()) {
+ JS_ReportErrorASCII(cx, "Argument is not a Debugger.Frame");
+ return false;
+ }
+
+ RootedValue objVal(cx, ObjectValue(*obj));
+ Rooted<DebuggerFrame*> frameObj(cx, DebuggerFrame::check(cx, objVal));
+ if (!frameObj) {
+ return false;
+ }
+
+ Rooted<DebuggerFrame*> adoptedFrame(cx);
+ if (frameObj->isOnStack()) {
+ FrameIter iter = frameObj->getFrameIter(cx);
+ if (!dbg->observesFrame(iter)) {
+ JS_ReportErrorASCII(cx, "Debugger.Frame's global is not a debuggee");
+ return false;
+ }
+ if (!dbg->getFrame(cx, iter, &adoptedFrame)) {
+ return false;
+ }
+ } else if (frameObj->isSuspended()) {
+ Rooted<AbstractGeneratorObject*> gen(cx, &frameObj->unwrappedGenerator());
+ if (!dbg->observesGlobal(&gen->global())) {
+ JS_ReportErrorASCII(cx, "Debugger.Frame's global is not a debuggee");
+ return false;
+ }
+
+ if (!dbg->getFrame(cx, gen, &adoptedFrame)) {
+ return false;
+ }
+ } else {
+ if (!dbg->getFrame(cx, &adoptedFrame)) {
+ return false;
+ }
+ }
+
+ args.rval().setObject(*adoptedFrame);
+ return true;
+}
+
+bool Debugger::CallData::adoptSource() {
+ if (!args.requireAtLeast(cx, "Debugger.adoptSource", 1)) {
+ return false;
+ }
+
+ RootedObject obj(cx, RequireObject(cx, args[0]));
+ if (!obj) {
+ return false;
+ }
+
+ obj = UncheckedUnwrap(obj);
+ if (!obj->is<DebuggerSource>()) {
+ JS_ReportErrorASCII(cx, "Argument is not a Debugger.Source");
+ return false;
+ }
+
+ Rooted<DebuggerSource*> sourceObj(cx, &obj->as<DebuggerSource>());
+ if (!sourceObj->getReferentRawObject()) {
+ JS_ReportErrorASCII(cx, "Argument is Debugger.Source.prototype");
+ return false;
+ }
+
+ Rooted<DebuggerSourceReferent> referent(cx, sourceObj->getReferent());
+
+ DebuggerAdoptSourceMatcher matcher(cx, dbg);
+ DebuggerSource* res = referent.match(matcher);
+ if (!res) {
+ return false;
+ }
+
+ args.rval().setObject(*res);
+ return true;
+}
+
+bool Debugger::CallData::enableAsyncStack() {
+ if (!args.requireAtLeast(cx, "Debugger.enableAsyncStack", 1)) {
+ return false;
+ }
+ Rooted<GlobalObject*> global(cx, dbg->unwrapDebuggeeArgument(cx, args[0]));
+ if (!global) {
+ return false;
+ }
+
+ global->realm()->isAsyncStackCapturingEnabled = true;
+
+ args.rval().setUndefined();
+ return true;
+}
+
+bool Debugger::CallData::disableAsyncStack() {
+ if (!args.requireAtLeast(cx, "Debugger.disableAsyncStack", 1)) {
+ return false;
+ }
+ Rooted<GlobalObject*> global(cx, dbg->unwrapDebuggeeArgument(cx, args[0]));
+ if (!global) {
+ return false;
+ }
+
+ global->realm()->isAsyncStackCapturingEnabled = false;
+
+ args.rval().setUndefined();
+ return true;
+}
+
+bool Debugger::CallData::enableUnlimitedStacksCapturing() {
+ if (!args.requireAtLeast(cx, "Debugger.enableUnlimitedStacksCapturing", 1)) {
+ return false;
+ }
+ Rooted<GlobalObject*> global(cx, dbg->unwrapDebuggeeArgument(cx, args[0]));
+ if (!global) {
+ return false;
+ }
+
+ global->realm()->isUnlimitedStacksCapturingEnabled = true;
+
+ args.rval().setUndefined();
+ return true;
+}
+
+bool Debugger::CallData::disableUnlimitedStacksCapturing() {
+ if (!args.requireAtLeast(cx, "Debugger.disableUnlimitedStacksCapturing", 1)) {
+ return false;
+ }
+ Rooted<GlobalObject*> global(cx, dbg->unwrapDebuggeeArgument(cx, args[0]));
+ if (!global) {
+ return false;
+ }
+
+ global->realm()->isUnlimitedStacksCapturingEnabled = false;
+
+ args.rval().setUndefined();
+ return true;
+}
+
+const JSPropertySpec Debugger::properties[] = {
+ JS_DEBUG_PSGS("onDebuggerStatement", getOnDebuggerStatement,
+ setOnDebuggerStatement),
+ JS_DEBUG_PSGS("onExceptionUnwind", getOnExceptionUnwind,
+ setOnExceptionUnwind),
+ JS_DEBUG_PSGS("onNewScript", getOnNewScript, setOnNewScript),
+ JS_DEBUG_PSGS("onNewPromise", getOnNewPromise, setOnNewPromise),
+ JS_DEBUG_PSGS("onPromiseSettled", getOnPromiseSettled, setOnPromiseSettled),
+ JS_DEBUG_PSGS("onEnterFrame", getOnEnterFrame, setOnEnterFrame),
+ JS_DEBUG_PSGS("onNativeCall", getOnNativeCall, setOnNativeCall),
+ JS_DEBUG_PSGS("onNewGlobalObject", getOnNewGlobalObject,
+ setOnNewGlobalObject),
+ JS_DEBUG_PSGS("uncaughtExceptionHook", getUncaughtExceptionHook,
+ setUncaughtExceptionHook),
+ JS_DEBUG_PSGS("allowUnobservedAsmJS", getAllowUnobservedAsmJS,
+ setAllowUnobservedAsmJS),
+ JS_DEBUG_PSGS("allowUnobservedWasm", getAllowUnobservedWasm,
+ setAllowUnobservedWasm),
+ JS_DEBUG_PSGS("collectCoverageInfo", getCollectCoverageInfo,
+ setCollectCoverageInfo),
+ JS_DEBUG_PSG("memory", getMemory),
+ JS_STRING_SYM_PS(toStringTag, "Debugger", JSPROP_READONLY),
+ JS_PS_END};
+
+const JSFunctionSpec Debugger::methods[] = {
+ JS_DEBUG_FN("addDebuggee", addDebuggee, 1),
+ JS_DEBUG_FN("addAllGlobalsAsDebuggees", addAllGlobalsAsDebuggees, 0),
+ JS_DEBUG_FN("removeDebuggee", removeDebuggee, 1),
+ JS_DEBUG_FN("removeAllDebuggees", removeAllDebuggees, 0),
+ JS_DEBUG_FN("hasDebuggee", hasDebuggee, 1),
+ JS_DEBUG_FN("getDebuggees", getDebuggees, 0),
+ JS_DEBUG_FN("getNewestFrame", getNewestFrame, 0),
+ JS_DEBUG_FN("clearAllBreakpoints", clearAllBreakpoints, 0),
+ JS_DEBUG_FN("findScripts", findScripts, 1),
+ JS_DEBUG_FN("findSources", findSources, 1),
+ JS_DEBUG_FN("findObjects", findObjects, 1),
+ JS_DEBUG_FN("findAllGlobals", findAllGlobals, 0),
+ JS_DEBUG_FN("findSourceURLs", findSourceURLs, 0),
+ JS_DEBUG_FN("makeGlobalObjectReference", makeGlobalObjectReference, 1),
+ JS_DEBUG_FN("adoptDebuggeeValue", adoptDebuggeeValue, 1),
+ JS_DEBUG_FN("adoptFrame", adoptFrame, 1),
+ JS_DEBUG_FN("adoptSource", adoptSource, 1),
+ JS_DEBUG_FN("enableAsyncStack", enableAsyncStack, 1),
+ JS_DEBUG_FN("disableAsyncStack", disableAsyncStack, 1),
+ JS_DEBUG_FN("enableUnlimitedStacksCapturing",
+ enableUnlimitedStacksCapturing, 1),
+ JS_DEBUG_FN("disableUnlimitedStacksCapturing",
+ disableUnlimitedStacksCapturing, 1),
+ JS_FS_END};
+
+const JSFunctionSpec Debugger::static_methods[]{
+ JS_FN("isCompilableUnit", Debugger::isCompilableUnit, 1, 0), JS_FS_END};
+
+DebuggerScript* Debugger::newDebuggerScript(
+ JSContext* cx, Handle<DebuggerScriptReferent> referent) {
+ cx->check(object.get());
+
+ RootedObject proto(
+ cx, &object->getReservedSlot(JSSLOT_DEBUG_SCRIPT_PROTO).toObject());
+ MOZ_ASSERT(proto);
+ Rooted<NativeObject*> debugger(cx, object);
+
+ return DebuggerScript::create(cx, proto, referent, debugger);
+}
+
+template <typename ReferentType, typename Map>
+typename Map::WrapperType* Debugger::wrapVariantReferent(
+ JSContext* cx, Map& map,
+ Handle<typename Map::WrapperType::ReferentVariant> referent) {
+ cx->check(object);
+
+ Handle<ReferentType*> untaggedReferent =
+ referent.template as<ReferentType*>();
+ MOZ_ASSERT(cx->compartment() != untaggedReferent->compartment());
+
+ DependentAddPtr<Map> p(cx, map, untaggedReferent);
+ if (!p) {
+ typename Map::WrapperType* wrapper = newVariantWrapper(cx, referent);
+ if (!wrapper) {
+ return nullptr;
+ }
+
+ if (!p.add(cx, map, untaggedReferent, wrapper)) {
+ // We need to destroy the edge to the referent, to avoid trying to trace
+ // it during untimely collections.
+ wrapper->clearReferent();
+ return nullptr;
+ }
+ }
+
+ return &p->value()->template as<typename Map::WrapperType>();
+}
+
+DebuggerScript* Debugger::wrapVariantReferent(
+ JSContext* cx, Handle<DebuggerScriptReferent> referent) {
+ if (referent.is<BaseScript*>()) {
+ return wrapVariantReferent<BaseScript>(cx, scripts, referent);
+ }
+
+ return wrapVariantReferent<WasmInstanceObject>(cx, wasmInstanceScripts,
+ referent);
+}
+
+DebuggerScript* Debugger::wrapScript(JSContext* cx,
+ Handle<BaseScript*> script) {
+ Rooted<DebuggerScriptReferent> referent(cx,
+ DebuggerScriptReferent(script.get()));
+ return wrapVariantReferent(cx, referent);
+}
+
+DebuggerScript* Debugger::wrapWasmScript(
+ JSContext* cx, Handle<WasmInstanceObject*> wasmInstance) {
+ Rooted<DebuggerScriptReferent> referent(cx, wasmInstance.get());
+ return wrapVariantReferent(cx, referent);
+}
+
+DebuggerSource* Debugger::newDebuggerSource(
+ JSContext* cx, Handle<DebuggerSourceReferent> referent) {
+ cx->check(object.get());
+
+ RootedObject proto(
+ cx, &object->getReservedSlot(JSSLOT_DEBUG_SOURCE_PROTO).toObject());
+ MOZ_ASSERT(proto);
+ Rooted<NativeObject*> debugger(cx, object);
+ return DebuggerSource::create(cx, proto, referent, debugger);
+}
+
+DebuggerSource* Debugger::wrapVariantReferent(
+ JSContext* cx, Handle<DebuggerSourceReferent> referent) {
+ DebuggerSource* obj;
+ if (referent.is<ScriptSourceObject*>()) {
+ obj = wrapVariantReferent<ScriptSourceObject>(cx, sources, referent);
+ } else {
+ obj = wrapVariantReferent<WasmInstanceObject>(cx, wasmInstanceSources,
+ referent);
+ }
+ MOZ_ASSERT_IF(obj, obj->getReferent() == referent);
+ return obj;
+}
+
+DebuggerSource* Debugger::wrapSource(JSContext* cx,
+ Handle<ScriptSourceObject*> source) {
+ Rooted<DebuggerSourceReferent> referent(cx, source.get());
+ return wrapVariantReferent(cx, referent);
+}
+
+DebuggerSource* Debugger::wrapWasmSource(
+ JSContext* cx, Handle<WasmInstanceObject*> wasmInstance) {
+ Rooted<DebuggerSourceReferent> referent(cx, wasmInstance.get());
+ return wrapVariantReferent(cx, referent);
+}
+
+bool Debugger::observesFrame(AbstractFramePtr frame) const {
+ if (frame.isWasmDebugFrame()) {
+ return observesWasm(frame.wasmInstance());
+ }
+
+ return observesScript(frame.script());
+}
+
+bool Debugger::observesFrame(const FrameIter& iter) const {
+ // Skip frames not yet fully initialized during their prologue.
+ if (iter.isInterp() && iter.isFunctionFrame()) {
+ const Value& thisVal = iter.interpFrame()->thisArgument();
+ if (thisVal.isMagic() && thisVal.whyMagic() == JS_IS_CONSTRUCTING) {
+ return false;
+ }
+ }
+ if (iter.isWasm()) {
+ // Skip frame of wasm instances we cannot observe.
+ if (!iter.wasmDebugEnabled()) {
+ return false;
+ }
+ return observesWasm(iter.wasmInstance());
+ }
+ return observesScript(iter.script());
+}
+
+bool Debugger::observesScript(JSScript* script) const {
+ // Don't ever observe self-hosted scripts: the Debugger API can break
+ // self-hosted invariants.
+ return observesGlobal(&script->global()) && !script->selfHosted();
+}
+
+bool Debugger::observesWasm(wasm::Instance* instance) const {
+ if (!instance->debugEnabled()) {
+ return false;
+ }
+ return observesGlobal(&instance->object()->global());
+}
+
+/* static */
+bool Debugger::replaceFrameGuts(JSContext* cx, AbstractFramePtr from,
+ AbstractFramePtr to, ScriptFrameIter& iter) {
+ MOZ_ASSERT(from != to);
+
+ // Rekey missingScopes to maintain Debugger.Environment identity and
+ // forward liveScopes to point to the new frame.
+ DebugEnvironments::forwardLiveFrame(cx, from, to);
+
+ // If we hit an OOM anywhere in here, we need to make sure there aren't any
+ // Debugger.Frame objects left partially-initialized.
+ auto terminateDebuggerFramesOnExit = MakeScopeExit([&] {
+ terminateDebuggerFrames(cx, from);
+ terminateDebuggerFrames(cx, to);
+
+ MOZ_ASSERT(!DebugAPI::inFrameMaps(from));
+ MOZ_ASSERT(!DebugAPI::inFrameMaps(to));
+ });
+
+ // Forward live Debugger.Frame objects.
+ Rooted<DebuggerFrameVector> frames(cx);
+ if (!getDebuggerFrames(from, &frames)) {
+ // An OOM here means that all Debuggers' frame maps still contain
+ // entries for 'from' and no entries for 'to'. Since the 'from' frame
+ // will be gone, they are removed by terminateDebuggerFramesOnExit
+ // above.
+ ReportOutOfMemory(cx);
+ return false;
+ }
+
+ for (size_t i = 0; i < frames.length(); i++) {
+ Handle<DebuggerFrame*> frameobj = frames[i];
+ Debugger* dbg = frameobj->owner();
+
+ // Update frame object's ScriptFrameIter::data pointer.
+ if (!frameobj->replaceFrameIterData(cx, iter)) {
+ return false;
+ }
+
+ // Add the frame object with |to| as key.
+ if (!dbg->frames.putNew(to, frameobj)) {
+ ReportOutOfMemory(cx);
+ return false;
+ }
+
+ // Remove the old frame entry after all fallible operations are completed
+ // so that an OOM will be able to clean up properly.
+ dbg->frames.remove(from);
+ }
+
+ // All frames successfuly replaced, cancel the rollback.
+ terminateDebuggerFramesOnExit.release();
+
+ MOZ_ASSERT(!DebugAPI::inFrameMaps(from));
+ MOZ_ASSERT_IF(!frames.empty(), DebugAPI::inFrameMaps(to));
+ return true;
+}
+
+/* static */
+bool DebugAPI::inFrameMaps(AbstractFramePtr frame) {
+ bool foundAny = false;
+ JS::AutoAssertNoGC nogc;
+ Debugger::forEachOnStackDebuggerFrame(
+ frame, nogc,
+ [&](Debugger*, DebuggerFrame* frameobj) { foundAny = true; });
+ return foundAny;
+}
+
+/* static */
+void Debugger::suspendGeneratorDebuggerFrames(JSContext* cx,
+ AbstractFramePtr frame) {
+ JS::GCContext* gcx = cx->gcContext();
+ JS::AutoAssertNoGC nogc;
+ forEachOnStackDebuggerFrame(
+ frame, nogc, [&](Debugger* dbg, DebuggerFrame* dbgFrame) {
+ dbg->frames.remove(frame);
+
+#if DEBUG
+ MOZ_ASSERT(dbgFrame->hasGeneratorInfo());
+ AbstractGeneratorObject& genObj = dbgFrame->unwrappedGenerator();
+ GeneratorWeakMap::Ptr p = dbg->generatorFrames.lookup(&genObj);
+ MOZ_ASSERT(p);
+ MOZ_ASSERT(p->value() == dbgFrame);
+#endif
+
+ dbgFrame->suspend(gcx);
+ });
+}
+
+/* static */
+void Debugger::terminateDebuggerFrames(JSContext* cx, AbstractFramePtr frame) {
+ JS::GCContext* gcx = cx->gcContext();
+
+ JS::AutoAssertNoGC nogc;
+ forEachOnStackOrSuspendedDebuggerFrame(
+ cx, frame, nogc, [&](Debugger* dbg, DebuggerFrame* dbgFrame) {
+ Debugger::terminateDebuggerFrame(gcx, dbg, dbgFrame, frame);
+ });
+
+ // If this is an eval frame, then from the debugger's perspective the
+ // script is about to be destroyed. Remove any breakpoints in it.
+ if (frame.isEvalFrame()) {
+ RootedScript script(cx, frame.script());
+ DebugScript::clearBreakpointsIn(cx->gcContext(), script, nullptr, nullptr);
+ }
+}
+
+/* static */
+void Debugger::terminateDebuggerFrame(
+ JS::GCContext* gcx, Debugger* dbg, DebuggerFrame* dbgFrame,
+ AbstractFramePtr frame, FrameMap::Enum* maybeFramesEnum,
+ GeneratorWeakMap::Enum* maybeGeneratorFramesEnum) {
+ // If we were not passed the frame, either we are destroying a frame early
+ // on before it was inserted into the "frames" list, or else we are
+ // terminating a frame from "generatorFrames" and the "frames" entries will
+ // be cleaned up later on with a second call to this function.
+ MOZ_ASSERT_IF(!frame, !maybeFramesEnum);
+ MOZ_ASSERT_IF(!frame, dbgFrame->hasGeneratorInfo());
+ MOZ_ASSERT_IF(!dbgFrame->hasGeneratorInfo(), !maybeGeneratorFramesEnum);
+
+ if (frame) {
+ if (maybeFramesEnum) {
+ maybeFramesEnum->removeFront();
+ } else {
+ dbg->frames.remove(frame);
+ }
+ }
+
+ if (dbgFrame->hasGeneratorInfo()) {
+ if (maybeGeneratorFramesEnum) {
+ maybeGeneratorFramesEnum->removeFront();
+ } else {
+ dbg->generatorFrames.remove(&dbgFrame->unwrappedGenerator());
+ }
+ }
+
+ dbgFrame->terminate(gcx, frame);
+}
+
+DebuggerDebuggeeLink* Debugger::getDebuggeeLink() {
+ return &object->getReservedSlot(JSSLOT_DEBUG_DEBUGGEE_LINK)
+ .toObject()
+ .as<DebuggerDebuggeeLink>();
+}
+
+void DebuggerDebuggeeLink::setLinkSlot(Debugger& dbg) {
+ setReservedSlot(DEBUGGER_LINK_SLOT, ObjectValue(*dbg.toJSObject()));
+}
+
+void DebuggerDebuggeeLink::clearLinkSlot() {
+ setReservedSlot(DEBUGGER_LINK_SLOT, UndefinedValue());
+}
+
+const JSClass DebuggerDebuggeeLink::class_ = {
+ "DebuggerDebuggeeLink", JSCLASS_HAS_RESERVED_SLOTS(RESERVED_SLOTS)};
+
+/* static */
+bool DebugAPI::handleBaselineOsr(JSContext* cx, InterpreterFrame* from,
+ jit::BaselineFrame* to) {
+ ScriptFrameIter iter(cx);
+ MOZ_ASSERT(iter.abstractFramePtr() == to);
+ return Debugger::replaceFrameGuts(cx, from, to, iter);
+}
+
+/* static */
+bool DebugAPI::handleIonBailout(JSContext* cx, jit::RematerializedFrame* from,
+ jit::BaselineFrame* to) {
+ // When we return to a bailed-out Ion real frame, we must update all
+ // Debugger.Frames that refer to its inline frames. However, since we
+ // can't pop individual inline frames off the stack (we can only pop the
+ // real frame that contains them all, as a unit), we cannot assume that
+ // the frame we're dealing with is the top frame. Advance the iterator
+ // across any inlined frames younger than |to|, the baseline frame
+ // reconstructed during bailout from the Ion frame corresponding to
+ // |from|.
+ ScriptFrameIter iter(cx);
+ while (iter.abstractFramePtr() != to) {
+ ++iter;
+ }
+ return Debugger::replaceFrameGuts(cx, from, to, iter);
+}
+
+/* static */
+void DebugAPI::handleUnrecoverableIonBailoutError(
+ JSContext* cx, jit::RematerializedFrame* frame) {
+ // Ion bailout can fail due to overrecursion. In such cases we cannot
+ // honor any further Debugger hooks on the frame, and need to ensure that
+ // its Debugger.Frame entry is cleaned up.
+ Debugger::terminateDebuggerFrames(cx, frame);
+}
+
+/*** JS::dbg::Builder *******************************************************/
+
+Builder::Builder(JSContext* cx, js::Debugger* debugger)
+ : debuggerObject(cx, debugger->toJSObject().get()), debugger(debugger) {}
+
+#if DEBUG
+void Builder::assertBuilt(JSObject* obj) {
+ // We can't use assertSameCompartment here, because that is always keyed to
+ // some JSContext's current compartment, whereas BuiltThings can be
+ // constructed and assigned to without respect to any particular context;
+ // the only constraint is that they should be in their debugger's compartment.
+ MOZ_ASSERT_IF(obj, debuggerObject->compartment() == obj->compartment());
+}
+#endif
+
+bool Builder::Object::definePropertyToTrusted(JSContext* cx, const char* name,
+ JS::MutableHandleValue trusted) {
+ // We should have checked for false Objects before calling this.
+ MOZ_ASSERT(value);
+
+ JSAtom* atom = Atomize(cx, name, strlen(name));
+ if (!atom) {
+ return false;
+ }
+ RootedId id(cx, AtomToId(atom));
+
+ return DefineDataProperty(cx, value, id, trusted);
+}
+
+bool Builder::Object::defineProperty(JSContext* cx, const char* name,
+ JS::HandleValue propval_) {
+ AutoRealm ar(cx, debuggerObject());
+
+ RootedValue propval(cx, propval_);
+ if (!debugger()->wrapDebuggeeValue(cx, &propval)) {
+ return false;
+ }
+
+ return definePropertyToTrusted(cx, name, &propval);
+}
+
+bool Builder::Object::defineProperty(JSContext* cx, const char* name,
+ JS::HandleObject propval_) {
+ RootedValue propval(cx, ObjectOrNullValue(propval_));
+ return defineProperty(cx, name, propval);
+}
+
+bool Builder::Object::defineProperty(JSContext* cx, const char* name,
+ Builder::Object& propval_) {
+ AutoRealm ar(cx, debuggerObject());
+
+ RootedValue propval(cx, ObjectOrNullValue(propval_.value));
+ return definePropertyToTrusted(cx, name, &propval);
+}
+
+Builder::Object Builder::newObject(JSContext* cx) {
+ AutoRealm ar(cx, debuggerObject);
+
+ Rooted<PlainObject*> obj(cx, NewPlainObject(cx));
+
+ // If the allocation failed, this will return a false Object, as the spec
+ // promises.
+ return Object(cx, *this, obj);
+}
+
+/*** JS::dbg::AutoEntryMonitor **********************************************/
+
+AutoEntryMonitor::AutoEntryMonitor(JSContext* cx)
+ : cx_(cx), savedMonitor_(cx->entryMonitor) {
+ cx->entryMonitor = this;
+}
+
+AutoEntryMonitor::~AutoEntryMonitor() { cx_->entryMonitor = savedMonitor_; }
+
+/*** Glue *******************************************************************/
+
+extern JS_PUBLIC_API bool JS_DefineDebuggerObject(JSContext* cx,
+ HandleObject obj) {
+ Rooted<NativeObject*> debugCtor(cx), debugProto(cx), frameProto(cx),
+ scriptProto(cx), sourceProto(cx), objectProto(cx), envProto(cx),
+ memoryProto(cx);
+ RootedObject debuggeeWouldRunProto(cx);
+ RootedValue debuggeeWouldRunCtor(cx);
+ Handle<GlobalObject*> global = obj.as<GlobalObject>();
+
+ debugProto = InitClass(cx, global, &DebuggerPrototypeObject::class_, nullptr,
+ "Debugger", Debugger::construct, 1,
+ Debugger::properties, Debugger::methods, nullptr,
+ Debugger::static_methods, debugCtor.address());
+ if (!debugProto) {
+ return false;
+ }
+
+ frameProto = DebuggerFrame::initClass(cx, global, debugCtor);
+ if (!frameProto) {
+ return false;
+ }
+
+ scriptProto = DebuggerScript::initClass(cx, global, debugCtor);
+ if (!scriptProto) {
+ return false;
+ }
+
+ sourceProto = DebuggerSource::initClass(cx, global, debugCtor);
+ if (!sourceProto) {
+ return false;
+ }
+
+ objectProto = DebuggerObject::initClass(cx, global, debugCtor);
+ if (!objectProto) {
+ return false;
+ }
+
+ envProto = DebuggerEnvironment::initClass(cx, global, debugCtor);
+ if (!envProto) {
+ return false;
+ }
+
+ memoryProto = InitClass(
+ cx, debugCtor, nullptr, nullptr, "Memory", DebuggerMemory::construct, 0,
+ DebuggerMemory::properties, DebuggerMemory::methods, nullptr, nullptr);
+ if (!memoryProto) {
+ return false;
+ }
+
+ debuggeeWouldRunProto = GlobalObject::getOrCreateCustomErrorPrototype(
+ cx, global, JSEXN_DEBUGGEEWOULDRUN);
+ if (!debuggeeWouldRunProto) {
+ return false;
+ }
+ debuggeeWouldRunCtor =
+ ObjectValue(global->getConstructor(JSProto_DebuggeeWouldRun));
+ RootedId debuggeeWouldRunId(
+ cx, NameToId(ClassName(JSProto_DebuggeeWouldRun, cx)));
+ if (!DefineDataProperty(cx, debugCtor, debuggeeWouldRunId,
+ debuggeeWouldRunCtor, 0)) {
+ return false;
+ }
+
+ debugProto->setReservedSlot(Debugger::JSSLOT_DEBUG_FRAME_PROTO,
+ ObjectValue(*frameProto));
+ debugProto->setReservedSlot(Debugger::JSSLOT_DEBUG_OBJECT_PROTO,
+ ObjectValue(*objectProto));
+ debugProto->setReservedSlot(Debugger::JSSLOT_DEBUG_SCRIPT_PROTO,
+ ObjectValue(*scriptProto));
+ debugProto->setReservedSlot(Debugger::JSSLOT_DEBUG_SOURCE_PROTO,
+ ObjectValue(*sourceProto));
+ debugProto->setReservedSlot(Debugger::JSSLOT_DEBUG_ENV_PROTO,
+ ObjectValue(*envProto));
+ debugProto->setReservedSlot(Debugger::JSSLOT_DEBUG_MEMORY_PROTO,
+ ObjectValue(*memoryProto));
+ return true;
+}
+
+JS_PUBLIC_API bool JS::dbg::IsDebugger(JSObject& obj) {
+ /* We only care about debugger objects, so CheckedUnwrapStatic is OK. */
+ JSObject* unwrapped = CheckedUnwrapStatic(&obj);
+ if (!unwrapped || !unwrapped->is<DebuggerInstanceObject>()) {
+ return false;
+ }
+ MOZ_ASSERT(js::Debugger::fromJSObject(unwrapped));
+ return true;
+}
+
+JS_PUBLIC_API bool JS::dbg::GetDebuggeeGlobals(
+ JSContext* cx, JSObject& dbgObj, MutableHandleObjectVector vector) {
+ MOZ_ASSERT(IsDebugger(dbgObj));
+ /* Since we know we have a debugger object, CheckedUnwrapStatic is fine. */
+ js::Debugger* dbg = js::Debugger::fromJSObject(CheckedUnwrapStatic(&dbgObj));
+
+ if (!vector.reserve(vector.length() + dbg->debuggees.count())) {
+ JS_ReportOutOfMemory(cx);
+ return false;
+ }
+
+ for (WeakGlobalObjectSet::Range r = dbg->allDebuggees(); !r.empty();
+ r.popFront()) {
+ vector.infallibleAppend(static_cast<JSObject*>(r.front()));
+ }
+
+ return true;
+}
+
+#ifdef DEBUG
+/* static */
+bool Debugger::isDebuggerCrossCompartmentEdge(JSObject* obj,
+ const gc::Cell* target) {
+ MOZ_ASSERT(target);
+
+ const gc::Cell* referent = nullptr;
+ if (obj->is<DebuggerScript>()) {
+ referent = obj->as<DebuggerScript>().getReferentCell();
+ } else if (obj->is<DebuggerSource>()) {
+ referent = obj->as<DebuggerSource>().getReferentRawObject();
+ } else if (obj->is<DebuggerObject>()) {
+ referent = obj->as<DebuggerObject>().referent();
+ } else if (obj->is<DebuggerEnvironment>()) {
+ referent = obj->as<DebuggerEnvironment>().referent();
+ }
+
+ return referent == target;
+}
+
+static void CheckDebuggeeThingRealm(Realm* realm, bool invisibleOk) {
+ MOZ_ASSERT_IF(!invisibleOk, !realm->creationOptions().invisibleToDebugger());
+}
+
+void js::CheckDebuggeeThing(BaseScript* script, bool invisibleOk) {
+ CheckDebuggeeThingRealm(script->realm(), invisibleOk);
+}
+
+void js::CheckDebuggeeThing(JSObject* obj, bool invisibleOk) {
+ if (Realm* realm = JS::GetObjectRealmOrNull(obj)) {
+ CheckDebuggeeThingRealm(realm, invisibleOk);
+ }
+}
+#endif // DEBUG
+
+/*** JS::dbg::GarbageCollectionEvent ****************************************/
+
+namespace JS {
+namespace dbg {
+
+/* static */ GarbageCollectionEvent::Ptr GarbageCollectionEvent::Create(
+ JSRuntime* rt, ::js::gcstats::Statistics& stats, uint64_t gcNumber) {
+ auto data = MakeUnique<GarbageCollectionEvent>(gcNumber);
+ if (!data) {
+ return nullptr;
+ }
+
+ data->nonincrementalReason = stats.nonincrementalReason();
+
+ for (auto& slice : stats.slices()) {
+ if (!data->reason) {
+ // There is only one GC reason for the whole cycle, but for legacy
+ // reasons this data is stored and replicated on each slice. Each
+ // slice used to have its own GCReason, but now they are all the
+ // same.
+ data->reason = ExplainGCReason(slice.reason);
+ MOZ_ASSERT(data->reason);
+ }
+
+ if (!data->collections.growBy(1)) {
+ return nullptr;
+ }
+
+ data->collections.back().startTimestamp = slice.start;
+ data->collections.back().endTimestamp = slice.end;
+ }
+
+ return data;
+}
+
+static bool DefineStringProperty(JSContext* cx, HandleObject obj,
+ PropertyName* propName, const char* strVal) {
+ RootedValue val(cx, UndefinedValue());
+ if (strVal) {
+ JSAtom* atomized = Atomize(cx, strVal, strlen(strVal));
+ if (!atomized) {
+ return false;
+ }
+ val = StringValue(atomized);
+ }
+ return DefineDataProperty(cx, obj, propName, val);
+}
+
+JSObject* GarbageCollectionEvent::toJSObject(JSContext* cx) const {
+ RootedObject obj(cx, NewPlainObject(cx));
+ RootedValue gcCycleNumberVal(cx, NumberValue(majorGCNumber_));
+ if (!obj ||
+ !DefineStringProperty(cx, obj, cx->names().nonincrementalReason,
+ nonincrementalReason) ||
+ !DefineStringProperty(cx, obj, cx->names().reason, reason) ||
+ !DefineDataProperty(cx, obj, cx->names().gcCycleNumber,
+ gcCycleNumberVal)) {
+ return nullptr;
+ }
+
+ Rooted<ArrayObject*> slicesArray(cx, NewDenseEmptyArray(cx));
+ if (!slicesArray) {
+ return nullptr;
+ }
+
+ TimeStamp originTime = TimeStamp::ProcessCreation();
+
+ size_t idx = 0;
+ for (auto range = collections.all(); !range.empty(); range.popFront()) {
+ Rooted<PlainObject*> collectionObj(cx, NewPlainObject(cx));
+ if (!collectionObj) {
+ return nullptr;
+ }
+
+ RootedValue start(cx), end(cx);
+ start = NumberValue(
+ (range.front().startTimestamp - originTime).ToMilliseconds());
+ end =
+ NumberValue((range.front().endTimestamp - originTime).ToMilliseconds());
+ if (!DefineDataProperty(cx, collectionObj, cx->names().startTimestamp,
+ start) ||
+ !DefineDataProperty(cx, collectionObj, cx->names().endTimestamp, end)) {
+ return nullptr;
+ }
+
+ RootedValue collectionVal(cx, ObjectValue(*collectionObj));
+ if (!DefineDataElement(cx, slicesArray, idx++, collectionVal)) {
+ return nullptr;
+ }
+ }
+
+ RootedValue slicesValue(cx, ObjectValue(*slicesArray));
+ if (!DefineDataProperty(cx, obj, cx->names().collections, slicesValue)) {
+ return nullptr;
+ }
+
+ return obj;
+}
+
+JS_PUBLIC_API bool FireOnGarbageCollectionHookRequired(JSContext* cx) {
+ AutoCheckCannotGC noGC;
+
+ for (auto& dbg : cx->runtime()->onGarbageCollectionWatchers()) {
+ MOZ_ASSERT(dbg.getHook(Debugger::OnGarbageCollection));
+ if (dbg.observedGC(cx->runtime()->gc.majorGCCount())) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+JS_PUBLIC_API bool FireOnGarbageCollectionHook(
+ JSContext* cx, JS::dbg::GarbageCollectionEvent::Ptr&& data) {
+ RootedObjectVector triggered(cx);
+
+ {
+ // We had better not GC (and potentially get a dangling Debugger
+ // pointer) while finding all Debuggers observing a debuggee that
+ // participated in this GC.
+ AutoCheckCannotGC noGC;
+
+ for (auto& dbg : cx->runtime()->onGarbageCollectionWatchers()) {
+ MOZ_ASSERT(dbg.getHook(Debugger::OnGarbageCollection));
+ if (dbg.observedGC(data->majorGCNumber())) {
+ if (!triggered.append(dbg.object)) {
+ JS_ReportOutOfMemory(cx);
+ return false;
+ }
+ }
+ }
+ }
+
+ for (; !triggered.empty(); triggered.popBack()) {
+ Debugger* dbg = Debugger::fromJSObject(triggered.back());
+
+ if (dbg->getHook(Debugger::OnGarbageCollection)) {
+ (void)dbg->enterDebuggerHook(cx, [&]() -> bool {
+ return dbg->fireOnGarbageCollectionHook(cx, data);
+ });
+ MOZ_ASSERT(!cx->isExceptionPending());
+ }
+ }
+
+ return true;
+}
+
+} // namespace dbg
+} // namespace JS