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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /js/src/jit/JSJitFrameIter.cpp | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'js/src/jit/JSJitFrameIter.cpp')
-rw-r--r-- | js/src/jit/JSJitFrameIter.cpp | 798 |
1 files changed, 798 insertions, 0 deletions
diff --git a/js/src/jit/JSJitFrameIter.cpp b/js/src/jit/JSJitFrameIter.cpp new file mode 100644 index 0000000000..5d846fbdab --- /dev/null +++ b/js/src/jit/JSJitFrameIter.cpp @@ -0,0 +1,798 @@ +/* -*- 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 "jit/JSJitFrameIter-inl.h" + +#include "jit/CalleeToken.h" +#include "jit/IonScript.h" +#include "jit/JitcodeMap.h" +#include "jit/JitFrames.h" +#include "jit/JitRuntime.h" +#include "jit/JitScript.h" +#include "jit/MacroAssembler.h" // js::jit::Assembler::GetPointer +#include "jit/SafepointIndex.h" +#include "jit/Safepoints.h" +#include "jit/ScriptFromCalleeToken.h" +#include "jit/VMFunctions.h" +#include "js/friend/DumpFunctions.h" // js::DumpObject, js::DumpValue +#include "vm/JitActivation.h" + +#include "vm/JSScript-inl.h" + +using namespace js; +using namespace js::jit; + +JSJitFrameIter::JSJitFrameIter(const JitActivation* activation) + : JSJitFrameIter(activation, FrameType::Exit, activation->jsExitFP()) {} + +JSJitFrameIter::JSJitFrameIter(const JitActivation* activation, + FrameType frameType, uint8_t* fp) + : current_(fp), + type_(frameType), + resumePCinCurrentFrame_(nullptr), + cachedSafepointIndex_(nullptr), + activation_(activation) { + MOZ_ASSERT(type_ == FrameType::JSJitToWasm || type_ == FrameType::Exit); + if (activation_->bailoutData()) { + current_ = activation_->bailoutData()->fp(); + type_ = FrameType::Bailout; + } else { + MOZ_ASSERT(!TlsContext.get()->inUnsafeCallWithABI); + } +} + +bool JSJitFrameIter::checkInvalidation() const { + IonScript* dummy; + return checkInvalidation(&dummy); +} + +bool JSJitFrameIter::checkInvalidation(IonScript** ionScriptOut) const { + JSScript* script = this->script(); + if (isBailoutJS()) { + *ionScriptOut = activation_->bailoutData()->ionScript(); + return !script->hasIonScript() || script->ionScript() != *ionScriptOut; + } + + uint8_t* returnAddr = resumePCinCurrentFrame(); + // N.B. the current IonScript is not the same as the frame's + // IonScript if the frame has since been invalidated. + bool invalidated = !script->hasIonScript() || + !script->ionScript()->containsReturnAddress(returnAddr); + if (!invalidated) { + return false; + } + + int32_t invalidationDataOffset = ((int32_t*)returnAddr)[-1]; + uint8_t* ionScriptDataOffset = returnAddr + invalidationDataOffset; + IonScript* ionScript = (IonScript*)Assembler::GetPointer(ionScriptDataOffset); + MOZ_ASSERT(ionScript->containsReturnAddress(returnAddr)); + *ionScriptOut = ionScript; + return true; +} + +CalleeToken JSJitFrameIter::calleeToken() const { + return ((JitFrameLayout*)current_)->calleeToken(); +} + +JSFunction* JSJitFrameIter::callee() const { + MOZ_ASSERT(isScripted()); + MOZ_ASSERT(isFunctionFrame()); + return CalleeTokenToFunction(calleeToken()); +} + +JSFunction* JSJitFrameIter::maybeCallee() const { + if (isScripted() && isFunctionFrame()) { + return callee(); + } + return nullptr; +} + +bool JSJitFrameIter::isBareExit() const { + if (type_ != FrameType::Exit) { + return false; + } + return exitFrame()->isBareExit(); +} + +bool JSJitFrameIter::isUnwoundJitExit() const { + if (type_ != FrameType::Exit) { + return false; + } + return exitFrame()->isUnwoundJitExit(); +} + +bool JSJitFrameIter::isFunctionFrame() const { + return CalleeTokenIsFunction(calleeToken()); +} + +JSScript* JSJitFrameIter::script() const { + MOZ_ASSERT(isScripted()); + JSScript* script = ScriptFromCalleeToken(calleeToken()); + MOZ_ASSERT(script); + return script; +} + +JSScript* JSJitFrameIter::maybeForwardedScript() const { + MOZ_ASSERT(isScripted()); + if (isBaselineJS()) { + return MaybeForwardedScriptFromCalleeToken(baselineFrame()->calleeToken()); + } + JSScript* script = MaybeForwardedScriptFromCalleeToken(calleeToken()); + MOZ_ASSERT(script); + return script; +} + +void JSJitFrameIter::baselineScriptAndPc(JSScript** scriptRes, + jsbytecode** pcRes) const { + MOZ_ASSERT(isBaselineJS()); + JSScript* script = this->script(); + if (scriptRes) { + *scriptRes = script; + } + + MOZ_ASSERT(pcRes); + + // The Baseline Interpreter stores the bytecode pc in the frame. + if (baselineFrame()->runningInInterpreter()) { + MOZ_ASSERT(baselineFrame()->interpreterScript() == script); + *pcRes = baselineFrame()->interpreterPC(); + return; + } + + // There must be a BaselineScript with a RetAddrEntry for the current return + // address. + uint8_t* retAddr = resumePCinCurrentFrame(); + const RetAddrEntry& entry = + script->baselineScript()->retAddrEntryFromReturnAddress(retAddr); + *pcRes = entry.pc(script); +} + +Value* JSJitFrameIter::actualArgs() const { return jsFrame()->actualArgs(); } + +uint8_t* JSJitFrameIter::prevFp() const { return current()->callerFramePtr(); } + +// Compute the size of a Baseline frame excluding pushed VMFunction arguments or +// callee frame headers. This is used to calculate the number of Value slots in +// the frame. The caller asserts this matches BaselineFrame::debugFrameSize. +static uint32_t ComputeBaselineFrameSize(const JSJitFrameIter& frame) { + MOZ_ASSERT(frame.prevType() == FrameType::BaselineJS); + + uint32_t frameSize = frame.current()->callerFramePtr() - frame.fp(); + + if (frame.isBaselineStub()) { + return frameSize - BaselineStubFrameLayout::Size(); + } + + // Note: an UnwoundJit exit frame is a JitFrameLayout that was turned into an + // ExitFrameLayout by EnsureUnwoundJitExitFrame. We have to use the original + // header size here because that's what we have on the stack. + if (frame.isScripted() || frame.isUnwoundJitExit()) { + return frameSize - JitFrameLayout::Size(); + } + + if (frame.isExitFrame()) { + frameSize -= ExitFrameLayout::Size(); + if (frame.exitFrame()->isWrapperExit()) { + const VMFunctionData* data = frame.exitFrame()->footer()->function(); + frameSize -= data->explicitStackSlots() * sizeof(void*); + } + return frameSize; + } + + MOZ_CRASH("Unexpected frame"); +} + +void JSJitFrameIter::operator++() { + MOZ_ASSERT(!isEntry()); + + // Compute BaselineFrame size. In debug builds this is equivalent to + // BaselineFrame::debugFrameSize_. This is asserted at the end of this method. + if (current()->prevType() == FrameType::BaselineJS) { + uint32_t frameSize = ComputeBaselineFrameSize(*this); + baselineFrameSize_ = mozilla::Some(frameSize); + } else { + baselineFrameSize_ = mozilla::Nothing(); + } + + cachedSafepointIndex_ = nullptr; + + // If the next frame is the entry frame, just exit. Don't update current_, + // since the entry and first frames overlap. + if (isEntry(current()->prevType())) { + type_ = current()->prevType(); + return; + } + + type_ = current()->prevType(); + resumePCinCurrentFrame_ = current()->returnAddress(); + current_ = prevFp(); + + MOZ_ASSERT_IF(isBaselineJS(), + baselineFrame()->debugFrameSize() == *baselineFrameSize_); +} + +uintptr_t* JSJitFrameIter::spillBase() const { + MOZ_ASSERT(isIonJS()); + + // Get the base address to where safepoint registers are spilled. + // Out-of-line calls do not unwind the extra padding space used to + // aggregate bailout tables, so we use frameSize instead of frameLocals, + // which would only account for local stack slots. + return reinterpret_cast<uintptr_t*>(fp() - ionScript()->frameSize()); +} + +MachineState JSJitFrameIter::machineState() const { + MOZ_ASSERT(isIonScripted()); + + // The MachineState is used by GCs for tracing call-sites. + if (MOZ_UNLIKELY(isBailoutJS())) { + return *activation_->bailoutData()->machineState(); + } + + SafepointReader reader(ionScript(), safepoint()); + + FloatRegisterSet fregs = reader.allFloatSpills().set().reduceSetForPush(); + GeneralRegisterSet regs = reader.allGprSpills().set(); + + uintptr_t* spill = spillBase(); + uint8_t* spillAlign = + alignDoubleSpill(reinterpret_cast<uint8_t*>(spill - regs.size())); + char* floatSpill = reinterpret_cast<char*>(spillAlign); + + return MachineState::FromSafepoint(fregs, regs, floatSpill, spill); +} + +JitFrameLayout* JSJitFrameIter::jsFrame() const { + MOZ_ASSERT(isScripted()); + if (isBailoutJS()) { + return (JitFrameLayout*)activation_->bailoutData()->fp(); + } + + return (JitFrameLayout*)fp(); +} + +IonScript* JSJitFrameIter::ionScript() const { + MOZ_ASSERT(isIonScripted()); + if (isBailoutJS()) { + return activation_->bailoutData()->ionScript(); + } + + IonScript* ionScript = nullptr; + if (checkInvalidation(&ionScript)) { + return ionScript; + } + return ionScriptFromCalleeToken(); +} + +IonScript* JSJitFrameIter::ionScriptFromCalleeToken() const { + MOZ_ASSERT(isIonJS()); + MOZ_ASSERT(!checkInvalidation()); + return script()->ionScript(); +} + +const SafepointIndex* JSJitFrameIter::safepoint() const { + MOZ_ASSERT(isIonJS()); + if (!cachedSafepointIndex_) { + cachedSafepointIndex_ = + ionScript()->getSafepointIndex(resumePCinCurrentFrame()); + } + return cachedSafepointIndex_; +} + +SnapshotOffset JSJitFrameIter::snapshotOffset() const { + MOZ_ASSERT(isIonScripted()); + if (isBailoutJS()) { + return activation_->bailoutData()->snapshotOffset(); + } + return osiIndex()->snapshotOffset(); +} + +const OsiIndex* JSJitFrameIter::osiIndex() const { + MOZ_ASSERT(isIonJS()); + SafepointReader reader(ionScript(), safepoint()); + return ionScript()->getOsiIndex(reader.osiReturnPointOffset()); +} + +bool JSJitFrameIter::isConstructing() const { + return CalleeTokenIsConstructing(calleeToken()); +} + +unsigned JSJitFrameIter::numActualArgs() const { + if (isScripted()) { + return jsFrame()->numActualArgs(); + } + + MOZ_ASSERT(isExitFrameLayout<NativeExitFrameLayout>()); + return exitFrame()->as<NativeExitFrameLayout>()->argc(); +} + +void JSJitFrameIter::dumpBaseline() const { + MOZ_ASSERT(isBaselineJS()); + + fprintf(stderr, " JS Baseline frame\n"); + if (isFunctionFrame()) { + fprintf(stderr, " callee fun: "); +#if defined(DEBUG) || defined(JS_JITSPEW) + DumpObject(callee()); +#else + fprintf(stderr, "?\n"); +#endif + } else { + fprintf(stderr, " global frame, no callee\n"); + } + + fprintf(stderr, " file %s line %u\n", script()->filename(), + script()->lineno()); + + JSContext* cx = TlsContext.get(); + RootedScript script(cx); + jsbytecode* pc; + baselineScriptAndPc(script.address(), &pc); + + fprintf(stderr, " script = %p, pc = %p (offset %u)\n", (void*)script, pc, + uint32_t(script->pcToOffset(pc))); + fprintf(stderr, " current op: %s\n", CodeName(JSOp(*pc))); + + fprintf(stderr, " actual args: %u\n", numActualArgs()); + + for (unsigned i = 0; i < baselineFrameNumValueSlots(); i++) { + fprintf(stderr, " slot %u: ", i); +#if defined(DEBUG) || defined(JS_JITSPEW) + Value* v = baselineFrame()->valueSlot(i); + DumpValue(*v); +#else + fprintf(stderr, "?\n"); +#endif + } +} + +void JSJitFrameIter::dump() const { + switch (type_) { + case FrameType::CppToJSJit: + fprintf(stderr, " Entry frame\n"); + fprintf(stderr, " Caller frame ptr: %p\n", current()->callerFramePtr()); + break; + case FrameType::BaselineJS: + dumpBaseline(); + break; + case FrameType::BaselineStub: + fprintf(stderr, " Baseline stub frame\n"); + fprintf(stderr, " Caller frame ptr: %p\n", current()->callerFramePtr()); + break; + case FrameType::Bailout: + case FrameType::IonJS: { + InlineFrameIterator frames(TlsContext.get(), this); + for (;;) { + frames.dump(); + if (!frames.more()) { + break; + } + ++frames; + } + break; + } + case FrameType::BaselineInterpreterEntry: + fprintf(stderr, " Baseline Interpreter Entry frame\n"); + fprintf(stderr, " Caller frame ptr: %p\n", current()->callerFramePtr()); + break; + case FrameType::Rectifier: + fprintf(stderr, " Rectifier frame\n"); + fprintf(stderr, " Caller frame ptr: %p\n", current()->callerFramePtr()); + break; + case FrameType::IonICCall: + fprintf(stderr, " Ion IC call\n"); + fprintf(stderr, " Caller frame ptr: %p\n", current()->callerFramePtr()); + break; + case FrameType::WasmToJSJit: + fprintf(stderr, " Fast wasm-to-JS entry frame\n"); + fprintf(stderr, " Caller frame ptr: %p\n", current()->callerFramePtr()); + break; + case FrameType::Exit: + fprintf(stderr, " Exit frame\n"); + break; + case FrameType::JSJitToWasm: + fprintf(stderr, " Wasm exit frame\n"); + break; + }; + fputc('\n', stderr); +} + +#ifdef DEBUG +bool JSJitFrameIter::verifyReturnAddressUsingNativeToBytecodeMap() { + MOZ_ASSERT(resumePCinCurrentFrame_ != nullptr); + + // Only handle Ion frames for now. + if (type_ != FrameType::IonJS && type_ != FrameType::BaselineJS) { + return true; + } + + JSRuntime* rt = TlsContext.get()->runtime(); + + // Don't verify while off thread. + if (!CurrentThreadCanAccessRuntime(rt)) { + return true; + } + + // Don't verify if sampling is being suppressed. + if (!TlsContext.get()->isProfilerSamplingEnabled()) { + return true; + } + + if (JS::RuntimeHeapIsMinorCollecting()) { + return true; + } + + JitRuntime* jitrt = rt->jitRuntime(); + + // Look up and print bytecode info for the native address. + const JitcodeGlobalEntry* entry = + jitrt->getJitcodeGlobalTable()->lookup(resumePCinCurrentFrame_); + if (!entry) { + return true; + } + + JitSpew(JitSpew_Profiling, "Found nativeToBytecode entry for %p: %p - %p", + resumePCinCurrentFrame_, entry->nativeStartAddr(), + entry->nativeEndAddr()); + + BytecodeLocationVector location; + uint32_t depth = UINT32_MAX; + if (!entry->callStackAtAddr(rt, resumePCinCurrentFrame_, location, &depth)) { + return false; + } + MOZ_ASSERT(depth > 0 && depth != UINT32_MAX); + MOZ_ASSERT(location.length() == depth); + + JitSpew(JitSpew_Profiling, "Found bytecode location of depth %u:", depth); + for (size_t i = 0; i < location.length(); i++) { + JitSpew(JitSpew_Profiling, " %s:%u - %zu", + location[i].getDebugOnlyScript()->filename(), + location[i].getDebugOnlyScript()->lineno(), + size_t(location[i].toRawBytecode() - + location[i].getDebugOnlyScript()->code())); + } + + if (type_ == FrameType::IonJS) { + // Create an InlineFrameIterator here and verify the mapped info against the + // iterator info. + InlineFrameIterator inlineFrames(TlsContext.get(), this); + for (size_t idx = 0; idx < location.length(); idx++) { + MOZ_ASSERT(idx < location.length()); + MOZ_ASSERT_IF(idx < location.length() - 1, inlineFrames.more()); + + JitSpew(JitSpew_Profiling, "Match %d: ION %s:%u(%zu) vs N2B %s:%u(%zu)", + (int)idx, inlineFrames.script()->filename(), + inlineFrames.script()->lineno(), + size_t(inlineFrames.pc() - inlineFrames.script()->code()), + location[idx].getDebugOnlyScript()->filename(), + location[idx].getDebugOnlyScript()->lineno(), + size_t(location[idx].toRawBytecode() - + location[idx].getDebugOnlyScript()->code())); + + MOZ_ASSERT(inlineFrames.script() == location[idx].getDebugOnlyScript()); + + if (inlineFrames.more()) { + ++inlineFrames; + } + } + } + + return true; +} +#endif // DEBUG + +JSJitProfilingFrameIterator::JSJitProfilingFrameIterator(JSContext* cx, + void* pc, void* sp) { + // If no profilingActivation is live, initialize directly to + // end-of-iteration state. + if (!cx->profilingActivation()) { + type_ = FrameType::CppToJSJit; + fp_ = nullptr; + resumePCinCurrentFrame_ = nullptr; + return; + } + + MOZ_ASSERT(cx->profilingActivation()->isJit()); + + JitActivation* act = cx->profilingActivation()->asJit(); + + // If the top JitActivation has a null lastProfilingFrame, assume that + // it's a trivially empty activation, and initialize directly + // to end-of-iteration state. + if (!act->lastProfilingFrame()) { + type_ = FrameType::CppToJSJit; + fp_ = nullptr; + resumePCinCurrentFrame_ = nullptr; + return; + } + + // Get the fp from the current profilingActivation + fp_ = (uint8_t*)act->lastProfilingFrame(); + + // Use fp_ as endStackAddress_. For cases below where we know we're currently + // executing JIT code, we use the current stack pointer instead. + endStackAddress_ = fp_; + + // Profiler sampling must NOT be suppressed if we are here. + MOZ_ASSERT(cx->isProfilerSamplingEnabled()); + + // Try initializing with sampler pc + if (tryInitWithPC(pc)) { + endStackAddress_ = sp; + return; + } + + // Try initializing with sampler pc using native=>bytecode table. + JitcodeGlobalTable* table = + cx->runtime()->jitRuntime()->getJitcodeGlobalTable(); + if (tryInitWithTable(table, pc, /* forLastCallSite = */ false)) { + endStackAddress_ = sp; + return; + } + + // Try initializing with lastProfilingCallSite pc + void* lastCallSite = act->lastProfilingCallSite(); + if (lastCallSite) { + if (tryInitWithPC(lastCallSite)) { + return; + } + + // Try initializing with lastProfilingCallSite pc using native=>bytecode + // table. + if (tryInitWithTable(table, lastCallSite, /* forLastCallSite = */ true)) { + return; + } + } + + // If nothing matches, for now just assume we are at the start of the last + // frame's baseline jit code or interpreter code. + type_ = FrameType::BaselineJS; + if (frameScript()->hasBaselineScript()) { + resumePCinCurrentFrame_ = frameScript()->baselineScript()->method()->raw(); + } else { + MOZ_ASSERT(IsBaselineInterpreterEnabled()); + resumePCinCurrentFrame_ = + cx->runtime()->jitRuntime()->baselineInterpreter().codeRaw(); + } +} + +template <typename ReturnType = CommonFrameLayout*> +static inline ReturnType GetPreviousRawFrame(CommonFrameLayout* frame) { + return ReturnType(frame->callerFramePtr()); +} + +JSJitProfilingFrameIterator::JSJitProfilingFrameIterator( + CommonFrameLayout* fp) { + endStackAddress_ = fp; + moveToNextFrame(fp); +} + +bool JSJitProfilingFrameIterator::tryInitWithPC(void* pc) { + JSScript* callee = frameScript(); + + // Check for Ion first, since it's more likely for hot code. + if (callee->hasIonScript() && + callee->ionScript()->method()->containsNativePC(pc)) { + type_ = FrameType::IonJS; + resumePCinCurrentFrame_ = pc; + return true; + } + + // Check for containment in Baseline jitcode second. + if (callee->hasBaselineScript() && + callee->baselineScript()->method()->containsNativePC(pc)) { + type_ = FrameType::BaselineJS; + resumePCinCurrentFrame_ = pc; + return true; + } + + return false; +} + +bool JSJitProfilingFrameIterator::tryInitWithTable(JitcodeGlobalTable* table, + void* pc, + bool forLastCallSite) { + if (!pc) { + return false; + } + + const JitcodeGlobalEntry* entry = table->lookup(pc); + if (!entry) { + return false; + } + + JSScript* callee = frameScript(); + + MOZ_ASSERT(entry->isIon() || entry->isIonIC() || entry->isBaseline() || + entry->isBaselineInterpreter() || entry->isDummy()); + + // Treat dummy lookups as an empty frame sequence. + if (entry->isDummy()) { + type_ = FrameType::CppToJSJit; + fp_ = nullptr; + resumePCinCurrentFrame_ = nullptr; + return true; + } + + // For IonICEntry, use the corresponding IonEntry. + if (entry->isIonIC()) { + entry = table->lookup(entry->asIonIC().rejoinAddr()); + MOZ_ASSERT(entry); + MOZ_RELEASE_ASSERT(entry->isIon()); + } + + if (entry->isIon()) { + // If looked-up callee doesn't match frame callee, don't accept + // lastProfilingCallSite + if (entry->asIon().getScript(0) != callee) { + return false; + } + + type_ = FrameType::IonJS; + resumePCinCurrentFrame_ = pc; + return true; + } + + if (entry->isBaseline()) { + // If looked-up callee doesn't match frame callee, don't accept + // lastProfilingCallSite + if (forLastCallSite && entry->asBaseline().script() != callee) { + return false; + } + + type_ = FrameType::BaselineJS; + resumePCinCurrentFrame_ = pc; + return true; + } + + if (entry->isBaselineInterpreter()) { + type_ = FrameType::BaselineJS; + resumePCinCurrentFrame_ = pc; + return true; + } + + return false; +} + +const char* JSJitProfilingFrameIterator::baselineInterpreterLabel() const { + MOZ_ASSERT(type_ == FrameType::BaselineJS); + return frameScript()->jitScript()->profileString(); +} + +void JSJitProfilingFrameIterator::baselineInterpreterScriptPC( + JSScript** script, jsbytecode** pc, uint64_t* realmID) const { + MOZ_ASSERT(type_ == FrameType::BaselineJS); + BaselineFrame* blFrame = (BaselineFrame*)(fp_ - BaselineFrame::Size()); + *script = frameScript(); + *pc = (*script)->code(); + + if (blFrame->runningInInterpreter() && + blFrame->interpreterScript() == *script) { + jsbytecode* interpPC = blFrame->interpreterPC(); + if ((*script)->containsPC(interpPC)) { + *pc = interpPC; + } + + *realmID = (*script)->realm()->creationOptions().profilerRealmID(); + } +} + +void JSJitProfilingFrameIterator::operator++() { + JitFrameLayout* frame = framePtr(); + moveToNextFrame(frame); +} + +void JSJitProfilingFrameIterator::moveToNextFrame(CommonFrameLayout* frame) { + /* + * fp_ points to a Baseline or Ion frame. The possible call-stacks + * patterns occurring between this frame and a previous Ion, Baseline or Entry + * frame are as follows: + * + * <Baseline-Or-Ion> + * ^ + * | + * ^--- Ion (or Baseline JSOp::Resume) + * | + * ^--- Baseline Stub <---- Baseline + * | + * ^--- IonICCall <---- Ion + * | + * ^--- WasmToJSJit <---- (other wasm frames, not handled by this iterator) + * | + * ^--- Arguments Rectifier + * | ^ + * | | + * | ^--- Ion + * | | + * | ^--- Baseline Stub <---- Baseline + * | | + * | ^--- WasmToJSJit <--- (other wasm frames) + * | | + * | ^--- Entry Frame (CppToJSJit) + * | + * ^--- Entry Frame (CppToJSJit) + * | + * ^--- Entry Frame (BaselineInterpreter) + * | ^ + * | | + * | ^--- Ion + * | | + * | ^--- Baseline Stub <---- Baseline + * | | + * | ^--- WasmToJSJit <--- (other wasm frames) + * | | + * | ^--- Entry Frame (CppToJSJit) + * | | + * | ^--- Arguments Rectifier + * + * NOTE: Keep this in sync with JitRuntime::generateProfilerExitFrameTailStub! + */ + + // Unwrap baseline interpreter entry frame. + if (frame->prevType() == FrameType::BaselineInterpreterEntry) { + frame = GetPreviousRawFrame<BaselineInterpreterEntryFrameLayout*>(frame); + } + + // Unwrap rectifier frames. + if (frame->prevType() == FrameType::Rectifier) { + frame = GetPreviousRawFrame<RectifierFrameLayout*>(frame); + MOZ_ASSERT(frame->prevType() == FrameType::IonJS || + frame->prevType() == FrameType::BaselineStub || + frame->prevType() == FrameType::WasmToJSJit || + frame->prevType() == FrameType::CppToJSJit); + } + + FrameType prevType = frame->prevType(); + switch (prevType) { + case FrameType::IonJS: + case FrameType::BaselineJS: + resumePCinCurrentFrame_ = frame->returnAddress(); + fp_ = GetPreviousRawFrame<uint8_t*>(frame); + type_ = prevType; + return; + + case FrameType::BaselineStub: + case FrameType::IonICCall: { + FrameType stubPrevType = (prevType == FrameType::BaselineStub) + ? FrameType::BaselineJS + : FrameType::IonJS; + auto* stubFrame = GetPreviousRawFrame<CommonFrameLayout*>(frame); + MOZ_ASSERT(stubFrame->prevType() == stubPrevType); + resumePCinCurrentFrame_ = stubFrame->returnAddress(); + fp_ = GetPreviousRawFrame<uint8_t*>(stubFrame); + type_ = stubPrevType; + return; + } + + case FrameType::WasmToJSJit: + // No previous js jit frame, this is a transition frame, used to + // pass a wasm iterator the correct value of FP. + resumePCinCurrentFrame_ = nullptr; + fp_ = GetPreviousRawFrame<uint8_t*>(frame); + type_ = FrameType::WasmToJSJit; + MOZ_ASSERT(!done()); + return; + + case FrameType::CppToJSJit: + // No previous frame, set to nullptr to indicate that + // JSJitProfilingFrameIterator is done(). + resumePCinCurrentFrame_ = nullptr; + fp_ = nullptr; + type_ = FrameType::CppToJSJit; + return; + + case FrameType::BaselineInterpreterEntry: + case FrameType::Rectifier: + case FrameType::Exit: + case FrameType::Bailout: + case FrameType::JSJitToWasm: + // Rectifier and Baseline Interpreter entry frames are handled before + // this switch. The other frame types can't call JS functions directly. + break; + } + + MOZ_CRASH("Bad frame type."); +} |