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-rw-r--r--js/src/vm/GeckoProfiler.cpp572
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diff --git a/js/src/vm/GeckoProfiler.cpp b/js/src/vm/GeckoProfiler.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/GeckoProfiler-inl.h"
+
+#include "mozilla/Sprintf.h"
+
+#include "jsnum.h"
+
+#include "gc/GC.h"
+#include "gc/PublicIterators.h"
+#include "jit/BaselineFrame.h"
+#include "jit/BaselineJIT.h"
+#include "jit/JitcodeMap.h"
+#include "jit/JitRuntime.h"
+#include "jit/JSJitFrameIter.h"
+#include "js/ProfilingStack.h"
+#include "js/TraceLoggerAPI.h"
+#include "util/StringBuffer.h"
+#include "vm/FrameIter.h" // js::OnlyJSJitFrameIter
+#include "vm/JSScript.h"
+
+#include "gc/Marking-inl.h"
+#include "vm/JSScript-inl.h"
+
+using namespace js;
+
+GeckoProfilerThread::GeckoProfilerThread()
+ : profilingStack_(nullptr), profilingStackIfEnabled_(nullptr) {}
+
+GeckoProfilerRuntime::GeckoProfilerRuntime(JSRuntime* rt)
+ : rt(rt),
+ strings_(),
+ slowAssertions(false),
+ enabled_(false),
+ eventMarker_(nullptr) {
+ MOZ_ASSERT(rt != nullptr);
+}
+
+void GeckoProfilerThread::setProfilingStack(ProfilingStack* profilingStack,
+ bool enabled) {
+ profilingStack_ = profilingStack;
+ profilingStackIfEnabled_ = enabled ? profilingStack : nullptr;
+}
+
+void GeckoProfilerRuntime::setEventMarker(void (*fn)(const char*,
+ const char*)) {
+ eventMarker_ = fn;
+}
+
+// Get a pointer to the top-most profiling frame, given the exit frame pointer.
+static void* GetTopProfilingJitFrame(Activation* act) {
+ if (!act || !act->isJit()) {
+ return nullptr;
+ }
+
+ jit::JitActivation* jitActivation = act->asJit();
+
+ // If there is no exit frame set, just return.
+ if (!jitActivation->hasExitFP()) {
+ return nullptr;
+ }
+
+ // Skip wasm frames that might be in the way.
+ OnlyJSJitFrameIter iter(jitActivation);
+ if (iter.done()) {
+ return nullptr;
+ }
+
+ jit::JSJitProfilingFrameIterator jitIter(
+ (jit::CommonFrameLayout*)iter.frame().fp());
+ MOZ_ASSERT(!jitIter.done());
+ return jitIter.fp();
+}
+
+void GeckoProfilerRuntime::enable(bool enabled) {
+ JSContext* cx = rt->mainContextFromAnyThread();
+ MOZ_ASSERT(cx->geckoProfiler().infraInstalled());
+
+ if (enabled_ == enabled) {
+ return;
+ }
+
+ /*
+ * Ensure all future generated code will be instrumented, or that all
+ * currently instrumented code is discarded
+ */
+ ReleaseAllJITCode(rt->defaultFreeOp());
+
+ // This function is called when the Gecko profiler makes a new Sampler
+ // (and thus, a new circular buffer). Set all current entries in the
+ // JitcodeGlobalTable as expired and reset the buffer range start.
+ if (rt->hasJitRuntime() && rt->jitRuntime()->hasJitcodeGlobalTable()) {
+ rt->jitRuntime()->getJitcodeGlobalTable()->setAllEntriesAsExpired();
+ }
+ rt->setProfilerSampleBufferRangeStart(0);
+
+ // Ensure that lastProfilingFrame is null for the main thread.
+ if (cx->jitActivation) {
+ cx->jitActivation->setLastProfilingFrame(nullptr);
+ cx->jitActivation->setLastProfilingCallSite(nullptr);
+ }
+
+ // Reset the tracelogger, if toggled on
+ JS::ResetTraceLogger();
+
+ enabled_ = enabled;
+
+ /* Toggle Gecko Profiler-related jumps on baseline jitcode.
+ * The call to |ReleaseAllJITCode| above will release most baseline jitcode,
+ * but not jitcode for scripts with active frames on the stack. These scripts
+ * need to have their profiler state toggled so they behave properly.
+ */
+ jit::ToggleBaselineProfiling(cx, enabled);
+
+ // Update lastProfilingFrame to point to the top-most JS jit-frame currently
+ // on stack.
+ if (cx->jitActivation) {
+ // Walk through all activations, and set their lastProfilingFrame
+ // appropriately.
+ if (enabled) {
+ Activation* act = cx->activation();
+ void* lastProfilingFrame = GetTopProfilingJitFrame(act);
+
+ jit::JitActivation* jitActivation = cx->jitActivation;
+ while (jitActivation) {
+ jitActivation->setLastProfilingFrame(lastProfilingFrame);
+ jitActivation->setLastProfilingCallSite(nullptr);
+
+ jitActivation = jitActivation->prevJitActivation();
+ lastProfilingFrame = GetTopProfilingJitFrame(jitActivation);
+ }
+ } else {
+ jit::JitActivation* jitActivation = cx->jitActivation;
+ while (jitActivation) {
+ jitActivation->setLastProfilingFrame(nullptr);
+ jitActivation->setLastProfilingCallSite(nullptr);
+ jitActivation = jitActivation->prevJitActivation();
+ }
+ }
+ }
+
+ // WebAssembly code does not need to be released, but profiling string
+ // labels have to be generated so that they are available during async
+ // profiling stack iteration.
+ for (RealmsIter r(rt); !r.done(); r.next()) {
+ r->wasm.ensureProfilingLabels(enabled);
+ }
+
+#ifdef JS_STRUCTURED_SPEW
+ // Enable the structured spewer if the environment variable is set.
+ if (enabled) {
+ cx->spewer().enableSpewing();
+ } else {
+ cx->spewer().disableSpewing();
+ }
+#endif
+}
+
+/* Lookup the string for the function/script, creating one if necessary */
+const char* GeckoProfilerRuntime::profileString(JSContext* cx,
+ BaseScript* script) {
+ ProfileStringMap::AddPtr s = strings().lookupForAdd(script);
+
+ if (!s) {
+ UniqueChars str = allocProfileString(cx, script);
+ if (!str) {
+ return nullptr;
+ }
+ MOZ_ASSERT(script->hasBytecode());
+ if (!strings().add(s, script, std::move(str))) {
+ ReportOutOfMemory(cx);
+ return nullptr;
+ }
+ }
+
+ return s->value().get();
+}
+
+void GeckoProfilerRuntime::onScriptFinalized(BaseScript* script) {
+ /*
+ * This function is called whenever a script is destroyed, regardless of
+ * whether profiling has been turned on, so don't invoke a function on an
+ * invalid hash set. Also, even if profiling was enabled but then turned
+ * off, we still want to remove the string, so no check of enabled() is
+ * done.
+ */
+ if (ProfileStringMap::Ptr entry = strings().lookup(script)) {
+ strings().remove(entry);
+ }
+}
+
+void GeckoProfilerRuntime::markEvent(const char* event, const char* details) {
+ MOZ_ASSERT(enabled());
+ if (eventMarker_) {
+ JS::AutoSuppressGCAnalysis nogc;
+ eventMarker_(event, details);
+ }
+}
+
+bool GeckoProfilerThread::enter(JSContext* cx, JSScript* script) {
+ const char* dynamicString =
+ cx->runtime()->geckoProfiler().profileString(cx, script);
+ if (dynamicString == nullptr) {
+ return false;
+ }
+
+#ifdef DEBUG
+ // In debug builds, assert the JS profiling stack frames already on the
+ // stack have a non-null pc. Only look at the top frames to avoid quadratic
+ // behavior.
+ uint32_t sp = profilingStack_->stackPointer;
+ if (sp > 0 && sp - 1 < profilingStack_->stackCapacity()) {
+ size_t start = (sp > 4) ? sp - 4 : 0;
+ for (size_t i = start; i < sp - 1; i++) {
+ MOZ_ASSERT_IF(profilingStack_->frames[i].isJsFrame(),
+ profilingStack_->frames[i].pc());
+ }
+ }
+#endif
+
+ profilingStack_->pushJsFrame(
+ "", dynamicString, script, script->code(),
+ script->realm()->creationOptions().profilerRealmID());
+ return true;
+}
+
+void GeckoProfilerThread::exit(JSContext* cx, JSScript* script) {
+ profilingStack_->pop();
+
+#ifdef DEBUG
+ /* Sanity check to make sure push/pop balanced */
+ uint32_t sp = profilingStack_->stackPointer;
+ if (sp < profilingStack_->stackCapacity()) {
+ JSRuntime* rt = script->runtimeFromMainThread();
+ const char* dynamicString = rt->geckoProfiler().profileString(cx, script);
+ /* Can't fail lookup because we should already be in the set */
+ MOZ_ASSERT(dynamicString);
+
+ // Bug 822041
+ if (!profilingStack_->frames[sp].isJsFrame()) {
+ fprintf(stderr, "--- ABOUT TO FAIL ASSERTION ---\n");
+ fprintf(stderr, " frames=%p size=%u/%u\n", (void*)profilingStack_->frames,
+ uint32_t(profilingStack_->stackPointer),
+ profilingStack_->stackCapacity());
+ for (int32_t i = sp; i >= 0; i--) {
+ ProfilingStackFrame& frame = profilingStack_->frames[i];
+ if (frame.isJsFrame()) {
+ fprintf(stderr, " [%d] JS %s\n", i, frame.dynamicString());
+ } else {
+ fprintf(stderr, " [%d] Label %s\n", i, frame.dynamicString());
+ }
+ }
+ }
+
+ ProfilingStackFrame& frame = profilingStack_->frames[sp];
+ MOZ_ASSERT(frame.isJsFrame());
+ MOZ_ASSERT(frame.script() == script);
+ MOZ_ASSERT(strcmp((const char*)frame.dynamicString(), dynamicString) == 0);
+ }
+#endif
+}
+
+/*
+ * Serializes the script/function pair into a "descriptive string" which is
+ * allowed to fail. This function cannot trigger a GC because it could finalize
+ * some scripts, resize the hash table of profile strings, and invalidate the
+ * AddPtr held while invoking allocProfileString.
+ */
+/* static */
+UniqueChars GeckoProfilerRuntime::allocProfileString(JSContext* cx,
+ BaseScript* script) {
+ // Note: this profiler string is regexp-matched by
+ // devtools/client/profiler/cleopatra/js/parserWorker.js.
+
+ // If the script has a function, try calculating its name.
+ bool hasName = false;
+ size_t nameLength = 0;
+ UniqueChars nameStr;
+ JSFunction* func = script->function();
+ if (func && func->displayAtom()) {
+ nameStr = StringToNewUTF8CharsZ(cx, *func->displayAtom());
+ if (!nameStr) {
+ return nullptr;
+ }
+
+ nameLength = strlen(nameStr.get());
+ hasName = true;
+ }
+
+ // Calculate filename length. We cap this to a reasonable limit to avoid
+ // performance impact of strlen/alloc/memcpy.
+ constexpr size_t MaxFilenameLength = 200;
+ const char* filenameStr = script->filename() ? script->filename() : "(null)";
+ size_t filenameLength = js_strnlen(filenameStr, MaxFilenameLength);
+
+ // Calculate line + column length.
+ bool hasLineAndColumn = false;
+ size_t lineAndColumnLength = 0;
+ char lineAndColumnStr[30];
+ if (hasName || script->isFunction() || script->isForEval()) {
+ lineAndColumnLength = SprintfLiteral(lineAndColumnStr, "%u:%u",
+ script->lineno(), script->column());
+ hasLineAndColumn = true;
+ }
+
+ // Full profile string for scripts with functions is:
+ // FuncName (FileName:Lineno:Column)
+ // Full profile string for scripts without functions is:
+ // FileName:Lineno:Column
+ // Full profile string for scripts without functions and without lines is:
+ // FileName
+
+ // Calculate full string length.
+ size_t fullLength = 0;
+ if (hasName) {
+ MOZ_ASSERT(hasLineAndColumn);
+ fullLength = nameLength + 2 + filenameLength + 1 + lineAndColumnLength + 1;
+ } else if (hasLineAndColumn) {
+ fullLength = filenameLength + 1 + lineAndColumnLength;
+ } else {
+ fullLength = filenameLength;
+ }
+
+ // Allocate string.
+ UniqueChars str(cx->pod_malloc<char>(fullLength + 1));
+ if (!str) {
+ return nullptr;
+ }
+
+ size_t cur = 0;
+
+ // Fill string with function name if needed.
+ if (hasName) {
+ memcpy(str.get() + cur, nameStr.get(), nameLength);
+ cur += nameLength;
+ str[cur++] = ' ';
+ str[cur++] = '(';
+ }
+
+ // Fill string with filename chars.
+ memcpy(str.get() + cur, filenameStr, filenameLength);
+ cur += filenameLength;
+
+ // Fill line + column chars.
+ if (hasLineAndColumn) {
+ str[cur++] = ':';
+ memcpy(str.get() + cur, lineAndColumnStr, lineAndColumnLength);
+ cur += lineAndColumnLength;
+ }
+
+ // Terminal ')' if necessary.
+ if (hasName) {
+ str[cur++] = ')';
+ }
+
+ MOZ_ASSERT(cur == fullLength);
+ str[cur] = 0;
+
+ return str;
+}
+
+void GeckoProfilerThread::trace(JSTracer* trc) {
+ if (profilingStack_) {
+ size_t size = profilingStack_->stackSize();
+ for (size_t i = 0; i < size; i++) {
+ profilingStack_->frames[i].trace(trc);
+ }
+ }
+}
+
+void GeckoProfilerRuntime::fixupStringsMapAfterMovingGC() {
+ for (ProfileStringMap::Enum e(strings()); !e.empty(); e.popFront()) {
+ BaseScript* script = e.front().key();
+ if (IsForwarded(script)) {
+ script = Forwarded(script);
+ e.rekeyFront(script);
+ }
+ }
+}
+
+#ifdef JSGC_HASH_TABLE_CHECKS
+void GeckoProfilerRuntime::checkStringsMapAfterMovingGC() {
+ for (auto r = strings().all(); !r.empty(); r.popFront()) {
+ BaseScript* script = r.front().key();
+ CheckGCThingAfterMovingGC(script);
+ auto ptr = strings().lookup(script);
+ MOZ_RELEASE_ASSERT(ptr.found() && &*ptr == &r.front());
+ }
+}
+#endif
+
+void ProfilingStackFrame::trace(JSTracer* trc) {
+ if (isJsFrame()) {
+ JSScript* s = rawScript();
+ TraceNullableRoot(trc, &s, "ProfilingStackFrame script");
+ spOrScript = s;
+ }
+}
+
+GeckoProfilerBaselineOSRMarker::GeckoProfilerBaselineOSRMarker(
+ JSContext* cx, bool hasProfilerFrame)
+ : profiler(&cx->geckoProfiler()) {
+ if (!hasProfilerFrame || !cx->runtime()->geckoProfiler().enabled()) {
+ profiler = nullptr;
+ return;
+ }
+
+ uint32_t sp = profiler->profilingStack_->stackPointer;
+ if (sp >= profiler->profilingStack_->stackCapacity()) {
+ profiler = nullptr;
+ return;
+ }
+
+ spBefore_ = sp;
+ if (sp == 0) {
+ return;
+ }
+
+ ProfilingStackFrame& frame = profiler->profilingStack_->frames[sp - 1];
+ MOZ_ASSERT(!frame.isOSRFrame());
+ frame.setIsOSRFrame(true);
+}
+
+GeckoProfilerBaselineOSRMarker::~GeckoProfilerBaselineOSRMarker() {
+ if (profiler == nullptr) {
+ return;
+ }
+
+ uint32_t sp = profiler->stackPointer();
+ MOZ_ASSERT(spBefore_ == sp);
+ if (sp == 0) {
+ return;
+ }
+
+ ProfilingStackFrame& frame = profiler->stack()[sp - 1];
+ MOZ_ASSERT(frame.isOSRFrame());
+ frame.setIsOSRFrame(false);
+}
+
+JS_PUBLIC_API JSScript* ProfilingStackFrame::script() const {
+ MOZ_ASSERT(isJsFrame());
+ auto script = reinterpret_cast<JSScript*>(spOrScript.operator void*());
+ if (!script) {
+ return nullptr;
+ }
+
+ // If profiling is supressed then we can't trust the script pointers to be
+ // valid as they could be in the process of being moved by a compacting GC
+ // (although it's still OK to get the runtime from them).
+ JSContext* cx = script->runtimeFromAnyThread()->mainContextFromAnyThread();
+ if (!cx->isProfilerSamplingEnabled()) {
+ return nullptr;
+ }
+
+ MOZ_ASSERT(!IsForwarded(script));
+ return script;
+}
+
+JS_FRIEND_API jsbytecode* ProfilingStackFrame::pc() const {
+ MOZ_ASSERT(isJsFrame());
+ if (pcOffsetIfJS_ == NullPCOffset) {
+ return nullptr;
+ }
+
+ JSScript* script = this->script();
+ return script ? script->offsetToPC(pcOffsetIfJS_) : nullptr;
+}
+
+/* static */
+int32_t ProfilingStackFrame::pcToOffset(JSScript* aScript, jsbytecode* aPc) {
+ return aPc ? aScript->pcToOffset(aPc) : NullPCOffset;
+}
+
+void ProfilingStackFrame::setPC(jsbytecode* pc) {
+ MOZ_ASSERT(isJsFrame());
+ JSScript* script = this->script();
+ MOZ_ASSERT(
+ script); // This should not be called while profiling is suppressed.
+ pcOffsetIfJS_ = pcToOffset(script, pc);
+}
+
+JS_FRIEND_API void js::SetContextProfilingStack(
+ JSContext* cx, ProfilingStack* profilingStack) {
+ cx->geckoProfiler().setProfilingStack(
+ profilingStack, cx->runtime()->geckoProfiler().enabled());
+}
+
+JS_FRIEND_API void js::EnableContextProfilingStack(JSContext* cx,
+ bool enabled) {
+ cx->geckoProfiler().enable(enabled);
+ cx->runtime()->geckoProfiler().enable(enabled);
+}
+
+JS_FRIEND_API void js::RegisterContextProfilingEventMarker(
+ JSContext* cx, void (*fn)(const char*, const char*)) {
+ MOZ_ASSERT(cx->runtime()->geckoProfiler().enabled());
+ cx->runtime()->geckoProfiler().setEventMarker(fn);
+}
+
+AutoSuppressProfilerSampling::AutoSuppressProfilerSampling(JSContext* cx)
+ : cx_(cx), previouslyEnabled_(cx->isProfilerSamplingEnabled()) {
+ if (previouslyEnabled_) {
+ cx_->disableProfilerSampling();
+ }
+}
+
+AutoSuppressProfilerSampling::~AutoSuppressProfilerSampling() {
+ if (previouslyEnabled_) {
+ cx_->enableProfilerSampling();
+ }
+}
+
+namespace JS {
+
+// clang-format off
+
+// ProfilingSubcategory_X:
+// One enum for each category X, listing that category's subcategories. This
+// allows the sProfilingCategoryInfo macro construction below to look up a
+// per-category index for a subcategory.
+#define SUBCATEGORY_ENUMS_BEGIN_CATEGORY(name, labelAsString, color) \
+ enum class ProfilingSubcategory_##name : uint32_t {
+#define SUBCATEGORY_ENUMS_SUBCATEGORY(category, name, labelAsString) \
+ name,
+#define SUBCATEGORY_ENUMS_END_CATEGORY \
+ };
+MOZ_PROFILING_CATEGORY_LIST(SUBCATEGORY_ENUMS_BEGIN_CATEGORY,
+ SUBCATEGORY_ENUMS_SUBCATEGORY,
+ SUBCATEGORY_ENUMS_END_CATEGORY)
+#undef SUBCATEGORY_ENUMS_BEGIN_CATEGORY
+#undef SUBCATEGORY_ENUMS_SUBCATEGORY
+#undef SUBCATEGORY_ENUMS_END_CATEGORY
+
+// sProfilingCategoryPairInfo:
+// A list of ProfilingCategoryPairInfos with the same order as
+// ProfilingCategoryPair, which can be used to map a ProfilingCategoryPair to
+// its information.
+#define CATEGORY_INFO_BEGIN_CATEGORY(name, labelAsString, color)
+#define CATEGORY_INFO_SUBCATEGORY(category, name, labelAsString) \
+ {ProfilingCategory::category, \
+ uint32_t(ProfilingSubcategory_##category::name), labelAsString},
+#define CATEGORY_INFO_END_CATEGORY
+const ProfilingCategoryPairInfo sProfilingCategoryPairInfo[] = {
+ MOZ_PROFILING_CATEGORY_LIST(CATEGORY_INFO_BEGIN_CATEGORY,
+ CATEGORY_INFO_SUBCATEGORY,
+ CATEGORY_INFO_END_CATEGORY)
+};
+#undef CATEGORY_INFO_BEGIN_CATEGORY
+#undef CATEGORY_INFO_SUBCATEGORY
+#undef CATEGORY_INFO_END_CATEGORY
+
+// clang-format on
+
+JS_FRIEND_API const ProfilingCategoryPairInfo& GetProfilingCategoryPairInfo(
+ ProfilingCategoryPair aCategoryPair) {
+ static_assert(
+ MOZ_ARRAY_LENGTH(sProfilingCategoryPairInfo) ==
+ uint32_t(ProfilingCategoryPair::COUNT),
+ "sProfilingCategoryPairInfo and ProfilingCategory need to have the "
+ "same order and the same length");
+
+ uint32_t categoryPairIndex = uint32_t(aCategoryPair);
+ MOZ_RELEASE_ASSERT(categoryPairIndex <=
+ uint32_t(ProfilingCategoryPair::LAST));
+ return sProfilingCategoryPairInfo[categoryPairIndex];
+}
+
+} // namespace JS