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-rw-r--r--js/src/vm/FrameIter.cpp1060
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diff --git a/js/src/vm/FrameIter.cpp b/js/src/vm/FrameIter.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 "vm/FrameIter-inl.h"
+
+#include "mozilla/Assertions.h" // MOZ_ASSERT, MOZ_CRASH
+#include "mozilla/MaybeOneOf.h" // mozilla::MaybeOneOf
+
+#include <stddef.h> // size_t
+#include <stdint.h> // uint8_t, uint32_t
+#include <stdlib.h> // getenv
+
+#include "jit/BaselineFrame.h" // js::jit::BaselineFrame
+#include "jit/JitFrames.h" // js::jit::EnsureUnwoundJitExitFrame
+#include "jit/JSJitFrameIter.h" // js::jit::{FrameType,InlineFrameIterator,JSJitFrameIter,MaybeReadFallback,SnapshotIterator}
+#include "js/GCAPI.h" // JS::AutoSuppressGCAnalysis
+#include "js/Principals.h" // JSSubsumesOp
+#include "js/RootingAPI.h" // JS::Rooted
+#include "vm/Activation.h" // js::Activation{,Iterator}
+#include "vm/EnvironmentObject.h" // js::CallObject
+#include "vm/JitActivation.h" // js::jit::JitActivation
+#include "vm/JSContext.h" // JSContext
+#include "vm/JSFunction.h" // JSFunction
+#include "vm/JSScript.h" // js::PCToLineNumber, JSScript, js::ScriptSource
+#include "vm/Runtime.h" // JSRuntime
+#include "vm/Stack.h" // js::{AbstractFramePtr,InterpreterFrame,MaybeCheckAliasing}
+#include "wasm/WasmFrameIter.h" // js::wasm::WasmFrameIter
+#include "wasm/WasmInstance.h" // js::wasm::Instance
+
+#include "jit/JSJitFrameIter-inl.h" // js::jit::JSJitFrameIter::baselineFrame{,NumValueSlots}
+#include "vm/Stack-inl.h" // js::AbstractFramePtr::*
+
+namespace JS {
+class JS_PUBLIC_API Realm;
+} // namespace JS
+
+namespace js {
+class ArgumentsObject;
+} // namespace js
+
+using JS::Realm;
+using JS::Rooted;
+using JS::Value;
+
+using js::AbstractFramePtr;
+using js::ArgumentsObject;
+using js::CallObject;
+using js::FrameIter;
+using js::JitFrameIter;
+using js::NonBuiltinFrameIter;
+using js::NonBuiltinScriptFrameIter;
+using js::OnlyJSJitFrameIter;
+using js::ScriptSource;
+using js::jit::JSJitFrameIter;
+
+JitFrameIter::JitFrameIter(const JitFrameIter& another) { *this = another; }
+
+JitFrameIter& JitFrameIter::operator=(const JitFrameIter& another) {
+ MOZ_ASSERT(this != &another);
+
+ act_ = another.act_;
+ mustUnwindActivation_ = another.mustUnwindActivation_;
+
+ if (isSome()) {
+ iter_.destroy();
+ }
+ if (!another.isSome()) {
+ return *this;
+ }
+
+ if (another.isJSJit()) {
+ iter_.construct<jit::JSJitFrameIter>(another.asJSJit());
+ } else {
+ MOZ_ASSERT(another.isWasm());
+ iter_.construct<wasm::WasmFrameIter>(another.asWasm());
+ }
+
+ return *this;
+}
+
+JitFrameIter::JitFrameIter(jit::JitActivation* act, bool mustUnwindActivation) {
+ act_ = act;
+ mustUnwindActivation_ = mustUnwindActivation;
+ MOZ_ASSERT(act->hasExitFP(),
+ "packedExitFP is used to determine if JSJit or wasm");
+ if (act->hasJSExitFP()) {
+ iter_.construct<jit::JSJitFrameIter>(act);
+ } else {
+ MOZ_ASSERT(act->hasWasmExitFP());
+ iter_.construct<wasm::WasmFrameIter>(act);
+ }
+ settle();
+}
+
+void JitFrameIter::skipNonScriptedJSFrames() {
+ if (isJSJit()) {
+ // Stop at the first scripted frame.
+ jit::JSJitFrameIter& frames = asJSJit();
+ while (!frames.isScripted() && !frames.done()) {
+ ++frames;
+ }
+ settle();
+ }
+}
+
+bool JitFrameIter::isSelfHostedIgnoringInlining() const {
+ MOZ_ASSERT(!done());
+
+ if (isWasm()) {
+ return false;
+ }
+
+ return asJSJit().script()->selfHosted();
+}
+
+JS::Realm* JitFrameIter::realm() const {
+ MOZ_ASSERT(!done());
+
+ if (isWasm()) {
+ return asWasm().instance()->realm();
+ }
+
+ return asJSJit().script()->realm();
+}
+
+uint8_t* JitFrameIter::resumePCinCurrentFrame() const {
+ if (isWasm()) {
+ return asWasm().resumePCinCurrentFrame();
+ }
+ return asJSJit().resumePCinCurrentFrame();
+}
+
+bool JitFrameIter::done() const {
+ if (!isSome()) {
+ return true;
+ }
+ if (isJSJit()) {
+ return asJSJit().done();
+ }
+ if (isWasm()) {
+ return asWasm().done();
+ }
+ MOZ_CRASH("unhandled case");
+}
+
+void JitFrameIter::settle() {
+ if (isJSJit()) {
+ const jit::JSJitFrameIter& jitFrame = asJSJit();
+ if (jitFrame.type() != jit::FrameType::WasmToJSJit) {
+ return;
+ }
+
+ // Transition from js jit frames to wasm frames: we're on the
+ // wasm-to-jit fast path. The current stack layout is as follows:
+ // (stack grows downward)
+ //
+ // [--------------------]
+ // [WASM FUNC ]
+ // [WASM JIT EXIT FRAME ]
+ // [JIT WASM ENTRY FRAME] <-- we're here.
+ //
+ // So prevFP points to the wasm jit exit FP, maintaing the invariant in
+ // WasmFrameIter that the first frame is an exit frame and can be
+ // popped.
+
+ wasm::Frame* prevFP = (wasm::Frame*)jitFrame.prevFp();
+
+ if (mustUnwindActivation_) {
+ act_->setWasmExitFP(prevFP);
+ }
+
+ iter_.destroy();
+ iter_.construct<wasm::WasmFrameIter>(act_, prevFP);
+ MOZ_ASSERT(!asWasm().done());
+ return;
+ }
+
+ if (isWasm()) {
+ const wasm::WasmFrameIter& wasmFrame = asWasm();
+ if (!wasmFrame.hasUnwoundJitFrame()) {
+ return;
+ }
+
+ // Transition from wasm frames to jit frames: we're on the
+ // jit-to-wasm fast path. The current stack layout is as follows:
+ // (stack grows downward)
+ //
+ // [--------------------]
+ // [JIT FRAME ]
+ // [WASM JIT ENTRY FRAME] <-- we're here
+ //
+ // The wasm iterator has saved the previous jit frame pointer for us.
+
+ MOZ_ASSERT(wasmFrame.done());
+ uint8_t* prevFP = wasmFrame.unwoundCallerFP();
+ jit::FrameType prevFrameType = wasmFrame.unwoundJitFrameType();
+
+ if (mustUnwindActivation_) {
+ act_->setJSExitFP(prevFP);
+ }
+
+ iter_.destroy();
+ iter_.construct<jit::JSJitFrameIter>(act_, prevFrameType, prevFP);
+ MOZ_ASSERT(!asJSJit().done());
+ return;
+ }
+}
+
+void JitFrameIter::operator++() {
+ MOZ_ASSERT(isSome());
+ if (isJSJit()) {
+ const jit::JSJitFrameIter& jitFrame = asJSJit();
+
+ jit::JitFrameLayout* prevFrame = nullptr;
+ if (mustUnwindActivation_ && jitFrame.isScripted()) {
+ prevFrame = jitFrame.jsFrame();
+ }
+
+ ++asJSJit();
+
+ if (prevFrame) {
+ // Unwind the frame by updating packedExitFP. This is necessary
+ // so that (1) debugger exception unwind and leave frame hooks
+ // don't see this frame when they use ScriptFrameIter, and (2)
+ // ScriptFrameIter does not crash when accessing an IonScript
+ // that's destroyed by the ionScript->decref call.
+ EnsureUnwoundJitExitFrame(act_, prevFrame);
+ }
+ } else if (isWasm()) {
+ ++asWasm();
+ } else {
+ MOZ_CRASH("unhandled case");
+ }
+ settle();
+}
+
+OnlyJSJitFrameIter::OnlyJSJitFrameIter(jit::JitActivation* act)
+ : JitFrameIter(act) {
+ settle();
+}
+
+OnlyJSJitFrameIter::OnlyJSJitFrameIter(const ActivationIterator& iter)
+ : OnlyJSJitFrameIter(iter->asJit()) {}
+
+/*****************************************************************************/
+
+void FrameIter::popActivation() {
+ ++data_.activations_;
+ settleOnActivation();
+}
+
+bool FrameIter::principalsSubsumeFrame() const {
+ // If the caller supplied principals, only show frames which are
+ // subsumed (of the same origin or of an origin accessible) by these
+ // principals.
+
+ MOZ_ASSERT(!done());
+
+ if (!data_.principals_) {
+ return true;
+ }
+
+ JSSubsumesOp subsumes = data_.cx_->runtime()->securityCallbacks->subsumes;
+ if (!subsumes) {
+ return true;
+ }
+
+ JS::AutoSuppressGCAnalysis nogc;
+ return subsumes(data_.principals_, realm()->principals());
+}
+
+void FrameIter::popInterpreterFrame() {
+ MOZ_ASSERT(data_.state_ == INTERP);
+
+ ++data_.interpFrames_;
+
+ if (data_.interpFrames_.done()) {
+ popActivation();
+ } else {
+ data_.pc_ = data_.interpFrames_.pc();
+ }
+}
+
+void FrameIter::settleOnActivation() {
+ MOZ_ASSERT(!data_.cx_->inUnsafeCallWithABI);
+
+ while (true) {
+ if (data_.activations_.done()) {
+ data_.state_ = DONE;
+ return;
+ }
+
+ Activation* activation = data_.activations_.activation();
+
+ if (activation->isJit()) {
+ data_.jitFrames_ = JitFrameIter(activation->asJit());
+ data_.jitFrames_.skipNonScriptedJSFrames();
+ if (data_.jitFrames_.done()) {
+ // It's possible to have an JitActivation with no scripted
+ // frames, for instance if we hit an over-recursion during
+ // bailout.
+ ++data_.activations_;
+ continue;
+ }
+ data_.state_ = JIT;
+ nextJitFrame();
+ return;
+ }
+
+ MOZ_ASSERT(activation->isInterpreter());
+
+ InterpreterActivation* interpAct = activation->asInterpreter();
+ data_.interpFrames_ = InterpreterFrameIterator(interpAct);
+
+ // If we OSR'ed into JIT code, skip the interpreter frame so that
+ // the same frame is not reported twice.
+ if (data_.interpFrames_.frame()->runningInJit()) {
+ ++data_.interpFrames_;
+ if (data_.interpFrames_.done()) {
+ ++data_.activations_;
+ continue;
+ }
+ }
+
+ MOZ_ASSERT(!data_.interpFrames_.frame()->runningInJit());
+ data_.pc_ = data_.interpFrames_.pc();
+ data_.state_ = INTERP;
+ return;
+ }
+}
+
+FrameIter::Data::Data(JSContext* cx, DebuggerEvalOption debuggerEvalOption,
+ JSPrincipals* principals)
+ : cx_(cx),
+ debuggerEvalOption_(debuggerEvalOption),
+ principals_(principals),
+ state_(DONE),
+ pc_(nullptr),
+ interpFrames_(nullptr),
+ activations_(cx),
+ ionInlineFrameNo_(0) {}
+
+FrameIter::Data::Data(const FrameIter::Data& other) = default;
+
+FrameIter::FrameIter(JSContext* cx, DebuggerEvalOption debuggerEvalOption)
+ : data_(cx, debuggerEvalOption, nullptr),
+ ionInlineFrames_(cx, (js::jit::JSJitFrameIter*)nullptr) {
+ settleOnActivation();
+
+ // No principals so we can see all frames.
+ MOZ_ASSERT_IF(!done(), principalsSubsumeFrame());
+}
+
+FrameIter::FrameIter(JSContext* cx, DebuggerEvalOption debuggerEvalOption,
+ JSPrincipals* principals)
+ : data_(cx, debuggerEvalOption, principals),
+ ionInlineFrames_(cx, (js::jit::JSJitFrameIter*)nullptr) {
+ settleOnActivation();
+
+ // If we're not allowed to see this frame, call operator++ to skip this (and
+ // other) cross-origin frames.
+ if (!done() && !principalsSubsumeFrame()) {
+ ++*this;
+ }
+}
+
+FrameIter::FrameIter(const FrameIter& other)
+ : data_(other.data_),
+ ionInlineFrames_(other.data_.cx_,
+ isIonScripted() ? &other.ionInlineFrames_ : nullptr) {}
+
+FrameIter::FrameIter(const Data& data)
+ : data_(data),
+ ionInlineFrames_(data.cx_, isIonScripted() ? &jsJitFrame() : nullptr) {
+ MOZ_ASSERT(data.cx_);
+ if (isIonScripted()) {
+ while (ionInlineFrames_.frameNo() != data.ionInlineFrameNo_) {
+ ++ionInlineFrames_;
+ }
+ }
+}
+
+void FrameIter::nextJitFrame() {
+ MOZ_ASSERT(data_.jitFrames_.isSome());
+
+ if (isJSJit()) {
+ if (jsJitFrame().isIonScripted()) {
+ ionInlineFrames_.resetOn(&jsJitFrame());
+ data_.pc_ = ionInlineFrames_.pc();
+ } else {
+ MOZ_ASSERT(jsJitFrame().isBaselineJS());
+ jsJitFrame().baselineScriptAndPc(nullptr, &data_.pc_);
+ }
+ return;
+ }
+
+ MOZ_ASSERT(isWasm());
+ data_.pc_ = nullptr;
+}
+
+void FrameIter::popJitFrame() {
+ MOZ_ASSERT(data_.state_ == JIT);
+ MOZ_ASSERT(data_.jitFrames_.isSome());
+
+ if (isJSJit() && jsJitFrame().isIonScripted() && ionInlineFrames_.more()) {
+ ++ionInlineFrames_;
+ data_.pc_ = ionInlineFrames_.pc();
+ return;
+ }
+
+ ++data_.jitFrames_;
+ data_.jitFrames_.skipNonScriptedJSFrames();
+
+ if (!data_.jitFrames_.done()) {
+ nextJitFrame();
+ } else {
+ data_.jitFrames_.reset();
+ popActivation();
+ }
+}
+
+FrameIter& FrameIter::operator++() {
+ while (true) {
+ switch (data_.state_) {
+ case DONE:
+ MOZ_CRASH("Unexpected state");
+ case INTERP:
+ if (interpFrame()->isDebuggerEvalFrame() &&
+ data_.debuggerEvalOption_ == FOLLOW_DEBUGGER_EVAL_PREV_LINK) {
+ AbstractFramePtr eifPrev = interpFrame()->evalInFramePrev();
+
+ popInterpreterFrame();
+
+ while (!hasUsableAbstractFramePtr() ||
+ abstractFramePtr() != eifPrev) {
+ if (data_.state_ == JIT) {
+ popJitFrame();
+ } else {
+ popInterpreterFrame();
+ }
+ }
+
+ break;
+ }
+ popInterpreterFrame();
+ break;
+ case JIT:
+ popJitFrame();
+ break;
+ }
+
+ if (done() || principalsSubsumeFrame()) {
+ break;
+ }
+ }
+
+ return *this;
+}
+
+FrameIter::Data* FrameIter::copyData() const {
+ Data* data = data_.cx_->new_<Data>(data_);
+ if (!data) {
+ return nullptr;
+ }
+
+ if (data && isIonScripted()) {
+ data->ionInlineFrameNo_ = ionInlineFrames_.frameNo();
+ }
+ return data;
+}
+
+void* FrameIter::rawFramePtr() const {
+ switch (data_.state_) {
+ case DONE:
+ return nullptr;
+ case INTERP:
+ return interpFrame();
+ case JIT:
+ if (isJSJit()) {
+ return jsJitFrame().fp();
+ }
+ MOZ_ASSERT(isWasm());
+ return nullptr;
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+JS::Compartment* FrameIter::compartment() const {
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case INTERP:
+ case JIT:
+ return data_.activations_->compartment();
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+Realm* FrameIter::realm() const {
+ MOZ_ASSERT(!done());
+
+ if (hasScript()) {
+ return script()->realm();
+ }
+
+ return wasmInstance()->realm();
+}
+
+bool FrameIter::isEvalFrame() const {
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case INTERP:
+ return interpFrame()->isEvalFrame();
+ case JIT:
+ if (isJSJit()) {
+ if (jsJitFrame().isBaselineJS()) {
+ return jsJitFrame().baselineFrame()->isEvalFrame();
+ }
+ MOZ_ASSERT(!script()->isForEval());
+ return false;
+ }
+ MOZ_ASSERT(isWasm());
+ return false;
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+bool FrameIter::isModuleFrame() const {
+ MOZ_ASSERT(!done());
+
+ if (hasScript()) {
+ return script()->isModule();
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+bool FrameIter::isFunctionFrame() const {
+ MOZ_ASSERT(!done());
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case INTERP:
+ return interpFrame()->isFunctionFrame();
+ case JIT:
+ if (isJSJit()) {
+ if (jsJitFrame().isBaselineJS()) {
+ return jsJitFrame().baselineFrame()->isFunctionFrame();
+ }
+ return script()->isFunction();
+ }
+ MOZ_ASSERT(isWasm());
+ return false;
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+JSAtom* FrameIter::maybeFunctionDisplayAtom() const {
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case INTERP:
+ case JIT:
+ if (isWasm()) {
+ return wasmFrame().functionDisplayAtom();
+ }
+ if (isFunctionFrame()) {
+ return calleeTemplate()->displayAtom();
+ }
+ return nullptr;
+ }
+
+ MOZ_CRASH("Unexpected state");
+}
+
+ScriptSource* FrameIter::scriptSource() const {
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case INTERP:
+ case JIT:
+ return script()->scriptSource();
+ }
+
+ MOZ_CRASH("Unexpected state");
+}
+
+const char* FrameIter::filename() const {
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case INTERP:
+ case JIT:
+ if (isWasm()) {
+ return wasmFrame().filename();
+ }
+ return script()->filename();
+ }
+
+ MOZ_CRASH("Unexpected state");
+}
+
+const char16_t* FrameIter::displayURL() const {
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case INTERP:
+ case JIT:
+ if (isWasm()) {
+ return wasmFrame().displayURL();
+ }
+ ScriptSource* ss = script()->scriptSource();
+ return ss->hasDisplayURL() ? ss->displayURL() : nullptr;
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+unsigned FrameIter::computeLine(uint32_t* column) const {
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case INTERP:
+ case JIT:
+ if (isWasm()) {
+ return wasmFrame().computeLine(column);
+ }
+ return PCToLineNumber(script(), pc(), column);
+ }
+
+ MOZ_CRASH("Unexpected state");
+}
+
+bool FrameIter::mutedErrors() const {
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case INTERP:
+ case JIT:
+ if (isWasm()) {
+ return wasmFrame().mutedErrors();
+ }
+ return script()->mutedErrors();
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+bool FrameIter::isConstructing() const {
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case JIT:
+ MOZ_ASSERT(isJSJit());
+ if (jsJitFrame().isIonScripted()) {
+ return ionInlineFrames_.isConstructing();
+ }
+ MOZ_ASSERT(jsJitFrame().isBaselineJS());
+ return jsJitFrame().isConstructing();
+ case INTERP:
+ return interpFrame()->isConstructing();
+ }
+
+ MOZ_CRASH("Unexpected state");
+}
+
+bool FrameIter::ensureHasRematerializedFrame(JSContext* cx) {
+ MOZ_ASSERT(isIon());
+ return !!activation()->asJit()->getRematerializedFrame(cx, jsJitFrame());
+}
+
+bool FrameIter::hasUsableAbstractFramePtr() const {
+ switch (data_.state_) {
+ case DONE:
+ return false;
+ case JIT:
+ if (isJSJit()) {
+ if (jsJitFrame().isBaselineJS()) {
+ return true;
+ }
+
+ MOZ_ASSERT(jsJitFrame().isIonScripted());
+ return !!activation()->asJit()->lookupRematerializedFrame(
+ jsJitFrame().fp(), ionInlineFrames_.frameNo());
+ }
+ MOZ_ASSERT(isWasm());
+ return wasmFrame().debugEnabled();
+ case INTERP:
+ return true;
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+AbstractFramePtr FrameIter::abstractFramePtr() const {
+ MOZ_ASSERT(hasUsableAbstractFramePtr());
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case JIT: {
+ if (isJSJit()) {
+ if (jsJitFrame().isBaselineJS()) {
+ return jsJitFrame().baselineFrame();
+ }
+ MOZ_ASSERT(isIonScripted());
+ return activation()->asJit()->lookupRematerializedFrame(
+ jsJitFrame().fp(), ionInlineFrames_.frameNo());
+ }
+ MOZ_ASSERT(isWasm());
+ MOZ_ASSERT(wasmFrame().debugEnabled());
+ return wasmFrame().debugFrame();
+ }
+ case INTERP:
+ MOZ_ASSERT(interpFrame());
+ return AbstractFramePtr(interpFrame());
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+void FrameIter::updatePcQuadratic() {
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case INTERP: {
+ InterpreterFrame* frame = interpFrame();
+ InterpreterActivation* activation = data_.activations_->asInterpreter();
+
+ // Look for the current frame.
+ data_.interpFrames_ = InterpreterFrameIterator(activation);
+ while (data_.interpFrames_.frame() != frame) {
+ ++data_.interpFrames_;
+ }
+
+ // Update the pc.
+ MOZ_ASSERT(data_.interpFrames_.frame() == frame);
+ data_.pc_ = data_.interpFrames_.pc();
+ return;
+ }
+ case JIT:
+ if (jsJitFrame().isBaselineJS()) {
+ jit::BaselineFrame* frame = jsJitFrame().baselineFrame();
+ jit::JitActivation* activation = data_.activations_->asJit();
+
+ // activation's exitFP may be invalid, so create a new
+ // activation iterator.
+ data_.activations_ = ActivationIterator(data_.cx_);
+ while (data_.activations_.activation() != activation) {
+ ++data_.activations_;
+ }
+
+ // Look for the current frame.
+ data_.jitFrames_ = JitFrameIter(data_.activations_->asJit());
+ while (!isJSJit() || !jsJitFrame().isBaselineJS() ||
+ jsJitFrame().baselineFrame() != frame) {
+ ++data_.jitFrames_;
+ }
+
+ // Update the pc.
+ MOZ_ASSERT(jsJitFrame().baselineFrame() == frame);
+ jsJitFrame().baselineScriptAndPc(nullptr, &data_.pc_);
+ return;
+ }
+ break;
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+void FrameIter::wasmUpdateBytecodeOffset() {
+ MOZ_RELEASE_ASSERT(isWasm(), "Unexpected state");
+
+ wasm::DebugFrame* frame = wasmFrame().debugFrame();
+
+ // Relookup the current frame, updating the bytecode offset in the process.
+ data_.jitFrames_ = JitFrameIter(data_.activations_->asJit());
+ while (wasmFrame().debugFrame() != frame) {
+ ++data_.jitFrames_;
+ }
+
+ MOZ_ASSERT(wasmFrame().debugFrame() == frame);
+}
+
+JSFunction* FrameIter::calleeTemplate() const {
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case INTERP:
+ MOZ_ASSERT(isFunctionFrame());
+ return &interpFrame()->callee();
+ case JIT:
+ if (jsJitFrame().isBaselineJS()) {
+ return jsJitFrame().callee();
+ }
+ MOZ_ASSERT(jsJitFrame().isIonScripted());
+ return ionInlineFrames_.calleeTemplate();
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+JSFunction* FrameIter::callee(JSContext* cx) const {
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case INTERP:
+ return calleeTemplate();
+ case JIT:
+ if (isIonScripted()) {
+ jit::MaybeReadFallback recover(cx, activation()->asJit(),
+ &jsJitFrame());
+ return ionInlineFrames_.callee(recover);
+ }
+ MOZ_ASSERT(jsJitFrame().isBaselineJS());
+ return calleeTemplate();
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+bool FrameIter::matchCallee(JSContext* cx, JS::Handle<JSFunction*> fun) const {
+ // Use the calleeTemplate to rule out a match without needing to invalidate to
+ // find the actual callee. The real callee my be a clone of the template which
+ // should *not* be considered a match.
+ Rooted<JSFunction*> currentCallee(cx, calleeTemplate());
+
+ if (currentCallee->nargs() != fun->nargs()) {
+ return false;
+ }
+
+ if (currentCallee->flags().stableAcrossClones() !=
+ fun->flags().stableAcrossClones()) {
+ return false;
+ }
+
+ // The calleeTemplate for a callee will always have the same BaseScript. If
+ // the script clones do not use the same script, they also have a different
+ // group and Ion will not inline them interchangeably.
+ //
+ // See: js::jit::InlineFrameIterator::findNextFrame()
+ if (currentCallee->hasBaseScript()) {
+ if (currentCallee->baseScript() != fun->baseScript()) {
+ return false;
+ }
+ }
+
+ return callee(cx) == fun;
+}
+
+unsigned FrameIter::numActualArgs() const {
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case INTERP:
+ MOZ_ASSERT(isFunctionFrame());
+ return interpFrame()->numActualArgs();
+ case JIT:
+ if (isIonScripted()) {
+ return ionInlineFrames_.numActualArgs();
+ }
+ MOZ_ASSERT(jsJitFrame().isBaselineJS());
+ return jsJitFrame().numActualArgs();
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+unsigned FrameIter::numFormalArgs() const {
+ return script()->function()->nargs();
+}
+
+Value FrameIter::unaliasedActual(unsigned i,
+ MaybeCheckAliasing checkAliasing) const {
+ return abstractFramePtr().unaliasedActual(i, checkAliasing);
+}
+
+JSObject* FrameIter::environmentChain(JSContext* cx) const {
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case JIT:
+ if (isJSJit()) {
+ if (isIonScripted()) {
+ jit::MaybeReadFallback recover(cx, activation()->asJit(),
+ &jsJitFrame());
+ return ionInlineFrames_.environmentChain(recover);
+ }
+ return jsJitFrame().baselineFrame()->environmentChain();
+ }
+ MOZ_ASSERT(isWasm());
+ return wasmFrame().debugFrame()->environmentChain();
+ case INTERP:
+ return interpFrame()->environmentChain();
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+bool FrameIter::hasInitialEnvironment(JSContext* cx) const {
+ if (hasUsableAbstractFramePtr()) {
+ return abstractFramePtr().hasInitialEnvironment();
+ }
+
+ if (isWasm()) {
+ // See JSFunction::needsFunctionEnvironmentObjects().
+ return false;
+ }
+
+ MOZ_ASSERT(isJSJit());
+ MOZ_ASSERT(isIonScripted());
+
+ bool hasInitialEnv = false;
+ jit::MaybeReadFallback recover(cx, activation()->asJit(), &jsJitFrame());
+ ionInlineFrames_.environmentChain(recover, &hasInitialEnv);
+
+ return hasInitialEnv;
+}
+
+CallObject& FrameIter::callObj(JSContext* cx) const {
+ MOZ_ASSERT(calleeTemplate()->needsCallObject());
+ MOZ_ASSERT(hasInitialEnvironment(cx));
+
+ JSObject* pobj = environmentChain(cx);
+ while (!pobj->is<CallObject>()) {
+ pobj = pobj->enclosingEnvironment();
+ }
+ return pobj->as<CallObject>();
+}
+
+bool FrameIter::hasArgsObj() const { return abstractFramePtr().hasArgsObj(); }
+
+ArgumentsObject& FrameIter::argsObj() const {
+ MOZ_ASSERT(hasArgsObj());
+ return abstractFramePtr().argsObj();
+}
+
+Value FrameIter::thisArgument(JSContext* cx) const {
+ MOZ_ASSERT(isFunctionFrame());
+
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case JIT:
+ if (isIonScripted()) {
+ jit::MaybeReadFallback recover(cx, activation()->asJit(),
+ &jsJitFrame());
+ return ionInlineFrames_.thisArgument(recover);
+ }
+ return jsJitFrame().baselineFrame()->thisArgument();
+ case INTERP:
+ return interpFrame()->thisArgument();
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+Value FrameIter::returnValue() const {
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case JIT:
+ if (jsJitFrame().isBaselineJS()) {
+ return jsJitFrame().baselineFrame()->returnValue();
+ }
+ break;
+ case INTERP:
+ return interpFrame()->returnValue();
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+void FrameIter::setReturnValue(const Value& v) {
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case JIT:
+ if (jsJitFrame().isBaselineJS()) {
+ jsJitFrame().baselineFrame()->setReturnValue(v);
+ return;
+ }
+ break;
+ case INTERP:
+ interpFrame()->setReturnValue(v);
+ return;
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+size_t FrameIter::numFrameSlots() const {
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case JIT: {
+ if (isIonScripted()) {
+ return ionInlineFrames_.snapshotIterator().numAllocations() -
+ ionInlineFrames_.script()->nfixed();
+ }
+ uint32_t numValueSlots = jsJitFrame().baselineFrameNumValueSlots();
+ return numValueSlots - jsJitFrame().script()->nfixed();
+ }
+ case INTERP:
+ MOZ_ASSERT(data_.interpFrames_.sp() >= interpFrame()->base());
+ return data_.interpFrames_.sp() - interpFrame()->base();
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+Value FrameIter::frameSlotValue(size_t index) const {
+ switch (data_.state_) {
+ case DONE:
+ break;
+ case JIT:
+ if (isIonScripted()) {
+ jit::SnapshotIterator si(ionInlineFrames_.snapshotIterator());
+ index += ionInlineFrames_.script()->nfixed();
+ return si.maybeReadAllocByIndex(index);
+ }
+ index += jsJitFrame().script()->nfixed();
+ return *jsJitFrame().baselineFrame()->valueSlot(index);
+ case INTERP:
+ return interpFrame()->base()[index];
+ }
+ MOZ_CRASH("Unexpected state");
+}
+
+#ifdef DEBUG
+bool js::SelfHostedFramesVisible() {
+ static bool checked = false;
+ static bool visible = false;
+ if (!checked) {
+ checked = true;
+ char* env = getenv("MOZ_SHOW_ALL_JS_FRAMES");
+ visible = !!env;
+ }
+ return visible;
+}
+#endif
+
+void NonBuiltinFrameIter::settle() {
+ if (!SelfHostedFramesVisible()) {
+ while (!done() && hasScript() && script()->selfHosted()) {
+ FrameIter::operator++();
+ }
+ }
+}
+
+void NonBuiltinScriptFrameIter::settle() {
+ if (!SelfHostedFramesVisible()) {
+ while (!done() && script()->selfHosted()) {
+ ScriptFrameIter::operator++();
+ }
+ }
+}
+
+bool FrameIter::inPrologue() const {
+ if (pc() < script()->main()) {
+ return true;
+ }
+ // If we do a VM call before pushing locals in baseline, the stack frame will
+ // not include space for those locals.
+ if (pc() == script()->code() && isBaseline() &&
+ jsJitFrame().baselineFrameNumValueSlots() < script()->nfixed()) {
+ return true;
+ }
+
+ return false;
+}