| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "v8.h" |
| |
| #include "ast.h" |
| #include "deoptimizer.h" |
| #include "frames-inl.h" |
| #include "full-codegen.h" |
| #include "lazy-instance.h" |
| #include "mark-compact.h" |
| #include "safepoint-table.h" |
| #include "scopeinfo.h" |
| #include "string-stream.h" |
| |
| #include "allocation-inl.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| static ReturnAddressLocationResolver return_address_location_resolver = NULL; |
| |
| |
| // Resolves pc_address through the resolution address function if one is set. |
| static inline Address* ResolveReturnAddressLocation(Address* pc_address) { |
| if (return_address_location_resolver == NULL) { |
| return pc_address; |
| } else { |
| return reinterpret_cast<Address*>( |
| return_address_location_resolver( |
| reinterpret_cast<uintptr_t>(pc_address))); |
| } |
| } |
| |
| |
| // Iterator that supports traversing the stack handlers of a |
| // particular frame. Needs to know the top of the handler chain. |
| class StackHandlerIterator BASE_EMBEDDED { |
| public: |
| StackHandlerIterator(const StackFrame* frame, StackHandler* handler) |
| : limit_(frame->fp()), handler_(handler) { |
| // Make sure the handler has already been unwound to this frame. |
| ASSERT(frame->sp() <= handler->address()); |
| } |
| |
| StackHandler* handler() const { return handler_; } |
| |
| bool done() { |
| return handler_ == NULL || handler_->address() > limit_; |
| } |
| void Advance() { |
| ASSERT(!done()); |
| handler_ = handler_->next(); |
| } |
| |
| private: |
| const Address limit_; |
| StackHandler* handler_; |
| }; |
| |
| |
| // ------------------------------------------------------------------------- |
| |
| |
| #define INITIALIZE_SINGLETON(type, field) field##_(this), |
| StackFrameIterator::StackFrameIterator() |
| : isolate_(Isolate::Current()), |
| STACK_FRAME_TYPE_LIST(INITIALIZE_SINGLETON) |
| frame_(NULL), handler_(NULL), |
| thread_(isolate_->thread_local_top()), |
| fp_(NULL), sp_(NULL), advance_(&StackFrameIterator::AdvanceWithHandler) { |
| Reset(); |
| } |
| StackFrameIterator::StackFrameIterator(Isolate* isolate) |
| : isolate_(isolate), |
| STACK_FRAME_TYPE_LIST(INITIALIZE_SINGLETON) |
| frame_(NULL), handler_(NULL), |
| thread_(isolate_->thread_local_top()), |
| fp_(NULL), sp_(NULL), advance_(&StackFrameIterator::AdvanceWithHandler) { |
| Reset(); |
| } |
| StackFrameIterator::StackFrameIterator(Isolate* isolate, ThreadLocalTop* t) |
| : isolate_(isolate), |
| STACK_FRAME_TYPE_LIST(INITIALIZE_SINGLETON) |
| frame_(NULL), handler_(NULL), thread_(t), |
| fp_(NULL), sp_(NULL), advance_(&StackFrameIterator::AdvanceWithHandler) { |
| Reset(); |
| } |
| StackFrameIterator::StackFrameIterator(Isolate* isolate, |
| bool use_top, Address fp, Address sp) |
| : isolate_(isolate), |
| STACK_FRAME_TYPE_LIST(INITIALIZE_SINGLETON) |
| frame_(NULL), handler_(NULL), |
| thread_(use_top ? isolate_->thread_local_top() : NULL), |
| fp_(use_top ? NULL : fp), sp_(sp), |
| advance_(use_top ? &StackFrameIterator::AdvanceWithHandler : |
| &StackFrameIterator::AdvanceWithoutHandler) { |
| if (use_top || fp != NULL) { |
| Reset(); |
| } |
| } |
| |
| #undef INITIALIZE_SINGLETON |
| |
| |
| void StackFrameIterator::AdvanceWithHandler() { |
| ASSERT(!done()); |
| // Compute the state of the calling frame before restoring |
| // callee-saved registers and unwinding handlers. This allows the |
| // frame code that computes the caller state to access the top |
| // handler and the value of any callee-saved register if needed. |
| StackFrame::State state; |
| StackFrame::Type type = frame_->GetCallerState(&state); |
| |
| // Unwind handlers corresponding to the current frame. |
| StackHandlerIterator it(frame_, handler_); |
| while (!it.done()) it.Advance(); |
| handler_ = it.handler(); |
| |
| // Advance to the calling frame. |
| frame_ = SingletonFor(type, &state); |
| |
| // When we're done iterating over the stack frames, the handler |
| // chain must have been completely unwound. |
| ASSERT(!done() || handler_ == NULL); |
| } |
| |
| |
| void StackFrameIterator::AdvanceWithoutHandler() { |
| // A simpler version of Advance which doesn't care about handler. |
| ASSERT(!done()); |
| StackFrame::State state; |
| StackFrame::Type type = frame_->GetCallerState(&state); |
| frame_ = SingletonFor(type, &state); |
| } |
| |
| |
| void StackFrameIterator::Reset() { |
| StackFrame::State state; |
| StackFrame::Type type; |
| if (thread_ != NULL) { |
| type = ExitFrame::GetStateForFramePointer( |
| Isolate::c_entry_fp(thread_), &state); |
| handler_ = StackHandler::FromAddress( |
| Isolate::handler(thread_)); |
| } else { |
| ASSERT(fp_ != NULL); |
| state.fp = fp_; |
| state.sp = sp_; |
| state.pc_address = ResolveReturnAddressLocation( |
| reinterpret_cast<Address*>(StandardFrame::ComputePCAddress(fp_))); |
| type = StackFrame::ComputeType(isolate(), &state); |
| } |
| if (SingletonFor(type) == NULL) return; |
| frame_ = SingletonFor(type, &state); |
| } |
| |
| |
| StackFrame* StackFrameIterator::SingletonFor(StackFrame::Type type, |
| StackFrame::State* state) { |
| if (type == StackFrame::NONE) return NULL; |
| StackFrame* result = SingletonFor(type); |
| ASSERT(result != NULL); |
| result->state_ = *state; |
| return result; |
| } |
| |
| |
| StackFrame* StackFrameIterator::SingletonFor(StackFrame::Type type) { |
| #define FRAME_TYPE_CASE(type, field) \ |
| case StackFrame::type: result = &field##_; break; |
| |
| StackFrame* result = NULL; |
| switch (type) { |
| case StackFrame::NONE: return NULL; |
| STACK_FRAME_TYPE_LIST(FRAME_TYPE_CASE) |
| default: break; |
| } |
| return result; |
| |
| #undef FRAME_TYPE_CASE |
| } |
| |
| |
| // ------------------------------------------------------------------------- |
| |
| |
| StackTraceFrameIterator::StackTraceFrameIterator() { |
| if (!done() && !IsValidFrame()) Advance(); |
| } |
| |
| |
| StackTraceFrameIterator::StackTraceFrameIterator(Isolate* isolate) |
| : JavaScriptFrameIterator(isolate) { |
| if (!done() && !IsValidFrame()) Advance(); |
| } |
| |
| |
| void StackTraceFrameIterator::Advance() { |
| while (true) { |
| JavaScriptFrameIterator::Advance(); |
| if (done()) return; |
| if (IsValidFrame()) return; |
| } |
| } |
| |
| bool StackTraceFrameIterator::IsValidFrame() { |
| if (!frame()->function()->IsJSFunction()) return false; |
| Object* script = JSFunction::cast(frame()->function())->shared()->script(); |
| // Don't show functions from native scripts to user. |
| return (script->IsScript() && |
| Script::TYPE_NATIVE != Script::cast(script)->type()->value()); |
| } |
| |
| |
| // ------------------------------------------------------------------------- |
| |
| |
| bool SafeStackFrameIterator::ExitFrameValidator::IsValidFP(Address fp) { |
| if (!validator_.IsValid(fp)) return false; |
| Address sp = ExitFrame::ComputeStackPointer(fp); |
| if (!validator_.IsValid(sp)) return false; |
| StackFrame::State state; |
| ExitFrame::FillState(fp, sp, &state); |
| if (!validator_.IsValid(reinterpret_cast<Address>(state.pc_address))) { |
| return false; |
| } |
| return *state.pc_address != NULL; |
| } |
| |
| |
| SafeStackFrameIterator::ActiveCountMaintainer::ActiveCountMaintainer( |
| Isolate* isolate) |
| : isolate_(isolate) { |
| isolate_->set_safe_stack_iterator_counter( |
| isolate_->safe_stack_iterator_counter() + 1); |
| } |
| |
| |
| SafeStackFrameIterator::ActiveCountMaintainer::~ActiveCountMaintainer() { |
| isolate_->set_safe_stack_iterator_counter( |
| isolate_->safe_stack_iterator_counter() - 1); |
| } |
| |
| |
| SafeStackFrameIterator::SafeStackFrameIterator( |
| Isolate* isolate, |
| Address fp, Address sp, Address low_bound, Address high_bound) : |
| maintainer_(isolate), |
| stack_validator_(low_bound, high_bound), |
| is_valid_top_(IsValidTop(isolate, low_bound, high_bound)), |
| is_valid_fp_(IsWithinBounds(low_bound, high_bound, fp)), |
| is_working_iterator_(is_valid_top_ || is_valid_fp_), |
| iteration_done_(!is_working_iterator_), |
| iterator_(isolate, is_valid_top_, is_valid_fp_ ? fp : NULL, sp) { |
| } |
| |
| bool SafeStackFrameIterator::is_active(Isolate* isolate) { |
| return isolate->safe_stack_iterator_counter() > 0; |
| } |
| |
| |
| bool SafeStackFrameIterator::IsValidTop(Isolate* isolate, |
| Address low_bound, Address high_bound) { |
| ThreadLocalTop* top = isolate->thread_local_top(); |
| Address fp = Isolate::c_entry_fp(top); |
| ExitFrameValidator validator(low_bound, high_bound); |
| if (!validator.IsValidFP(fp)) return false; |
| return Isolate::handler(top) != NULL; |
| } |
| |
| |
| void SafeStackFrameIterator::Advance() { |
| ASSERT(is_working_iterator_); |
| ASSERT(!done()); |
| StackFrame* last_frame = iterator_.frame(); |
| Address last_sp = last_frame->sp(), last_fp = last_frame->fp(); |
| // Before advancing to the next stack frame, perform pointer validity tests |
| iteration_done_ = !IsValidFrame(last_frame) || |
| !CanIterateHandles(last_frame, iterator_.handler()) || |
| !IsValidCaller(last_frame); |
| if (iteration_done_) return; |
| |
| iterator_.Advance(); |
| if (iterator_.done()) return; |
| // Check that we have actually moved to the previous frame in the stack |
| StackFrame* prev_frame = iterator_.frame(); |
| iteration_done_ = prev_frame->sp() < last_sp || prev_frame->fp() < last_fp; |
| } |
| |
| |
| bool SafeStackFrameIterator::CanIterateHandles(StackFrame* frame, |
| StackHandler* handler) { |
| // If StackIterator iterates over StackHandles, verify that |
| // StackHandlerIterator can be instantiated (see StackHandlerIterator |
| // constructor.) |
| return !is_valid_top_ || (frame->sp() <= handler->address()); |
| } |
| |
| |
| bool SafeStackFrameIterator::IsValidFrame(StackFrame* frame) const { |
| return IsValidStackAddress(frame->sp()) && IsValidStackAddress(frame->fp()); |
| } |
| |
| |
| bool SafeStackFrameIterator::IsValidCaller(StackFrame* frame) { |
| StackFrame::State state; |
| if (frame->is_entry() || frame->is_entry_construct()) { |
| // See EntryFrame::GetCallerState. It computes the caller FP address |
| // and calls ExitFrame::GetStateForFramePointer on it. We need to be |
| // sure that caller FP address is valid. |
| Address caller_fp = Memory::Address_at( |
| frame->fp() + EntryFrameConstants::kCallerFPOffset); |
| ExitFrameValidator validator(stack_validator_); |
| if (!validator.IsValidFP(caller_fp)) return false; |
| } else if (frame->is_arguments_adaptor()) { |
| // See ArgumentsAdaptorFrame::GetCallerStackPointer. It assumes that |
| // the number of arguments is stored on stack as Smi. We need to check |
| // that it really an Smi. |
| Object* number_of_args = reinterpret_cast<ArgumentsAdaptorFrame*>(frame)-> |
| GetExpression(0); |
| if (!number_of_args->IsSmi()) { |
| return false; |
| } |
| } |
| frame->ComputeCallerState(&state); |
| return IsValidStackAddress(state.sp) && IsValidStackAddress(state.fp) && |
| iterator_.SingletonFor(frame->GetCallerState(&state)) != NULL; |
| } |
| |
| |
| void SafeStackFrameIterator::Reset() { |
| if (is_working_iterator_) { |
| iterator_.Reset(); |
| iteration_done_ = false; |
| } |
| } |
| |
| |
| // ------------------------------------------------------------------------- |
| |
| |
| SafeStackTraceFrameIterator::SafeStackTraceFrameIterator( |
| Isolate* isolate, |
| Address fp, Address sp, Address low_bound, Address high_bound) : |
| SafeJavaScriptFrameIterator(isolate, fp, sp, low_bound, high_bound) { |
| if (!done() && !frame()->is_java_script()) Advance(); |
| } |
| |
| |
| void SafeStackTraceFrameIterator::Advance() { |
| while (true) { |
| SafeJavaScriptFrameIterator::Advance(); |
| if (done()) return; |
| if (frame()->is_java_script()) return; |
| } |
| } |
| |
| |
| Code* StackFrame::GetSafepointData(Isolate* isolate, |
| Address inner_pointer, |
| SafepointEntry* safepoint_entry, |
| unsigned* stack_slots) { |
| InnerPointerToCodeCache::InnerPointerToCodeCacheEntry* entry = |
| isolate->inner_pointer_to_code_cache()->GetCacheEntry(inner_pointer); |
| if (!entry->safepoint_entry.is_valid()) { |
| entry->safepoint_entry = entry->code->GetSafepointEntry(inner_pointer); |
| ASSERT(entry->safepoint_entry.is_valid()); |
| } else { |
| ASSERT(entry->safepoint_entry.Equals( |
| entry->code->GetSafepointEntry(inner_pointer))); |
| } |
| |
| // Fill in the results and return the code. |
| Code* code = entry->code; |
| *safepoint_entry = entry->safepoint_entry; |
| *stack_slots = code->stack_slots(); |
| return code; |
| } |
| |
| |
| bool StackFrame::HasHandler() const { |
| StackHandlerIterator it(this, top_handler()); |
| return !it.done(); |
| } |
| |
| |
| #ifdef DEBUG |
| static bool GcSafeCodeContains(HeapObject* object, Address addr); |
| #endif |
| |
| |
| void StackFrame::IteratePc(ObjectVisitor* v, |
| Address* pc_address, |
| Code* holder) { |
| Address pc = *pc_address; |
| ASSERT(GcSafeCodeContains(holder, pc)); |
| unsigned pc_offset = static_cast<unsigned>(pc - holder->instruction_start()); |
| Object* code = holder; |
| v->VisitPointer(&code); |
| if (code != holder) { |
| holder = reinterpret_cast<Code*>(code); |
| pc = holder->instruction_start() + pc_offset; |
| *pc_address = pc; |
| } |
| } |
| |
| |
| void StackFrame::SetReturnAddressLocationResolver( |
| ReturnAddressLocationResolver resolver) { |
| ASSERT(return_address_location_resolver == NULL); |
| return_address_location_resolver = resolver; |
| } |
| |
| |
| StackFrame::Type StackFrame::ComputeType(Isolate* isolate, State* state) { |
| ASSERT(state->fp != NULL); |
| if (StandardFrame::IsArgumentsAdaptorFrame(state->fp)) { |
| return ARGUMENTS_ADAPTOR; |
| } |
| // The marker and function offsets overlap. If the marker isn't a |
| // smi then the frame is a JavaScript frame -- and the marker is |
| // really the function. |
| const int offset = StandardFrameConstants::kMarkerOffset; |
| Object* marker = Memory::Object_at(state->fp + offset); |
| if (!marker->IsSmi()) { |
| // If we're using a "safe" stack iterator, we treat optimized |
| // frames as normal JavaScript frames to avoid having to look |
| // into the heap to determine the state. This is safe as long |
| // as nobody tries to GC... |
| if (SafeStackFrameIterator::is_active(isolate)) return JAVA_SCRIPT; |
| Code::Kind kind = GetContainingCode(isolate, *(state->pc_address))->kind(); |
| ASSERT(kind == Code::FUNCTION || kind == Code::OPTIMIZED_FUNCTION); |
| return (kind == Code::OPTIMIZED_FUNCTION) ? OPTIMIZED : JAVA_SCRIPT; |
| } |
| return static_cast<StackFrame::Type>(Smi::cast(marker)->value()); |
| } |
| |
| |
| |
| StackFrame::Type StackFrame::GetCallerState(State* state) const { |
| ComputeCallerState(state); |
| return ComputeType(isolate(), state); |
| } |
| |
| |
| Address StackFrame::UnpaddedFP() const { |
| #if defined(V8_TARGET_ARCH_IA32) |
| if (!is_optimized()) return fp(); |
| int32_t alignment_state = Memory::int32_at( |
| fp() + JavaScriptFrameConstants::kDynamicAlignmentStateOffset); |
| |
| return (alignment_state == kAlignmentPaddingPushed) ? |
| (fp() + kPointerSize) : fp(); |
| #else |
| return fp(); |
| #endif |
| } |
| |
| |
| Code* EntryFrame::unchecked_code() const { |
| return HEAP->js_entry_code(); |
| } |
| |
| |
| void EntryFrame::ComputeCallerState(State* state) const { |
| GetCallerState(state); |
| } |
| |
| |
| void EntryFrame::SetCallerFp(Address caller_fp) { |
| const int offset = EntryFrameConstants::kCallerFPOffset; |
| Memory::Address_at(this->fp() + offset) = caller_fp; |
| } |
| |
| |
| StackFrame::Type EntryFrame::GetCallerState(State* state) const { |
| const int offset = EntryFrameConstants::kCallerFPOffset; |
| Address fp = Memory::Address_at(this->fp() + offset); |
| return ExitFrame::GetStateForFramePointer(fp, state); |
| } |
| |
| |
| Code* EntryConstructFrame::unchecked_code() const { |
| return HEAP->js_construct_entry_code(); |
| } |
| |
| |
| Object*& ExitFrame::code_slot() const { |
| const int offset = ExitFrameConstants::kCodeOffset; |
| return Memory::Object_at(fp() + offset); |
| } |
| |
| |
| Code* ExitFrame::unchecked_code() const { |
| return reinterpret_cast<Code*>(code_slot()); |
| } |
| |
| |
| void ExitFrame::ComputeCallerState(State* state) const { |
| // Set up the caller state. |
| state->sp = caller_sp(); |
| state->fp = Memory::Address_at(fp() + ExitFrameConstants::kCallerFPOffset); |
| state->pc_address = ResolveReturnAddressLocation( |
| reinterpret_cast<Address*>(fp() + ExitFrameConstants::kCallerPCOffset)); |
| } |
| |
| |
| void ExitFrame::SetCallerFp(Address caller_fp) { |
| Memory::Address_at(fp() + ExitFrameConstants::kCallerFPOffset) = caller_fp; |
| } |
| |
| |
| void ExitFrame::Iterate(ObjectVisitor* v) const { |
| // The arguments are traversed as part of the expression stack of |
| // the calling frame. |
| IteratePc(v, pc_address(), LookupCode()); |
| v->VisitPointer(&code_slot()); |
| } |
| |
| |
| Address ExitFrame::GetCallerStackPointer() const { |
| return fp() + ExitFrameConstants::kCallerSPDisplacement; |
| } |
| |
| |
| StackFrame::Type ExitFrame::GetStateForFramePointer(Address fp, State* state) { |
| if (fp == 0) return NONE; |
| Address sp = ComputeStackPointer(fp); |
| FillState(fp, sp, state); |
| ASSERT(*state->pc_address != NULL); |
| return EXIT; |
| } |
| |
| |
| void ExitFrame::FillState(Address fp, Address sp, State* state) { |
| state->sp = sp; |
| state->fp = fp; |
| state->pc_address = ResolveReturnAddressLocation( |
| reinterpret_cast<Address*>(sp - 1 * kPointerSize)); |
| } |
| |
| |
| Address StandardFrame::GetExpressionAddress(int n) const { |
| const int offset = StandardFrameConstants::kExpressionsOffset; |
| return fp() + offset - n * kPointerSize; |
| } |
| |
| |
| Object* StandardFrame::GetExpression(Address fp, int index) { |
| return Memory::Object_at(GetExpressionAddress(fp, index)); |
| } |
| |
| |
| Address StandardFrame::GetExpressionAddress(Address fp, int n) { |
| const int offset = StandardFrameConstants::kExpressionsOffset; |
| return fp + offset - n * kPointerSize; |
| } |
| |
| |
| int StandardFrame::ComputeExpressionsCount() const { |
| const int offset = |
| StandardFrameConstants::kExpressionsOffset + kPointerSize; |
| Address base = fp() + offset; |
| Address limit = sp(); |
| ASSERT(base >= limit); // stack grows downwards |
| // Include register-allocated locals in number of expressions. |
| return static_cast<int>((base - limit) / kPointerSize); |
| } |
| |
| |
| void StandardFrame::ComputeCallerState(State* state) const { |
| state->sp = caller_sp(); |
| state->fp = caller_fp(); |
| state->pc_address = ResolveReturnAddressLocation( |
| reinterpret_cast<Address*>(ComputePCAddress(fp()))); |
| } |
| |
| |
| void StandardFrame::SetCallerFp(Address caller_fp) { |
| Memory::Address_at(fp() + StandardFrameConstants::kCallerFPOffset) = |
| caller_fp; |
| } |
| |
| |
| bool StandardFrame::IsExpressionInsideHandler(int n) const { |
| Address address = GetExpressionAddress(n); |
| for (StackHandlerIterator it(this, top_handler()); !it.done(); it.Advance()) { |
| if (it.handler()->includes(address)) return true; |
| } |
| return false; |
| } |
| |
| |
| void OptimizedFrame::Iterate(ObjectVisitor* v) const { |
| #ifdef DEBUG |
| // Make sure that optimized frames do not contain any stack handlers. |
| StackHandlerIterator it(this, top_handler()); |
| ASSERT(it.done()); |
| #endif |
| |
| // Make sure that we're not doing "safe" stack frame iteration. We cannot |
| // possibly find pointers in optimized frames in that state. |
| ASSERT(!SafeStackFrameIterator::is_active(isolate())); |
| |
| // Compute the safepoint information. |
| unsigned stack_slots = 0; |
| SafepointEntry safepoint_entry; |
| Code* code = StackFrame::GetSafepointData( |
| isolate(), pc(), &safepoint_entry, &stack_slots); |
| unsigned slot_space = stack_slots * kPointerSize; |
| |
| // Visit the outgoing parameters. |
| Object** parameters_base = &Memory::Object_at(sp()); |
| Object** parameters_limit = &Memory::Object_at( |
| fp() + JavaScriptFrameConstants::kFunctionOffset - slot_space); |
| |
| // Visit the parameters that may be on top of the saved registers. |
| if (safepoint_entry.argument_count() > 0) { |
| v->VisitPointers(parameters_base, |
| parameters_base + safepoint_entry.argument_count()); |
| parameters_base += safepoint_entry.argument_count(); |
| } |
| |
| // Skip saved double registers. |
| if (safepoint_entry.has_doubles()) { |
| parameters_base += DoubleRegister::kNumAllocatableRegisters * |
| kDoubleSize / kPointerSize; |
| } |
| |
| // Visit the registers that contain pointers if any. |
| if (safepoint_entry.HasRegisters()) { |
| for (int i = kNumSafepointRegisters - 1; i >=0; i--) { |
| if (safepoint_entry.HasRegisterAt(i)) { |
| int reg_stack_index = MacroAssembler::SafepointRegisterStackIndex(i); |
| v->VisitPointer(parameters_base + reg_stack_index); |
| } |
| } |
| // Skip the words containing the register values. |
| parameters_base += kNumSafepointRegisters; |
| } |
| |
| // We're done dealing with the register bits. |
| uint8_t* safepoint_bits = safepoint_entry.bits(); |
| safepoint_bits += kNumSafepointRegisters >> kBitsPerByteLog2; |
| |
| // Visit the rest of the parameters. |
| v->VisitPointers(parameters_base, parameters_limit); |
| |
| // Visit pointer spill slots and locals. |
| for (unsigned index = 0; index < stack_slots; index++) { |
| int byte_index = index >> kBitsPerByteLog2; |
| int bit_index = index & (kBitsPerByte - 1); |
| if ((safepoint_bits[byte_index] & (1U << bit_index)) != 0) { |
| v->VisitPointer(parameters_limit + index); |
| } |
| } |
| |
| // Visit the context and the function. |
| Object** fixed_base = &Memory::Object_at( |
| fp() + JavaScriptFrameConstants::kFunctionOffset); |
| Object** fixed_limit = &Memory::Object_at(fp()); |
| v->VisitPointers(fixed_base, fixed_limit); |
| |
| // Visit the return address in the callee and incoming arguments. |
| IteratePc(v, pc_address(), code); |
| } |
| |
| |
| bool JavaScriptFrame::IsConstructor() const { |
| Address fp = caller_fp(); |
| if (has_adapted_arguments()) { |
| // Skip the arguments adaptor frame and look at the real caller. |
| fp = Memory::Address_at(fp + StandardFrameConstants::kCallerFPOffset); |
| } |
| return IsConstructFrame(fp); |
| } |
| |
| |
| int JavaScriptFrame::GetArgumentsLength() const { |
| // If there is an arguments adaptor frame get the arguments length from it. |
| if (has_adapted_arguments()) { |
| return Smi::cast(GetExpression(caller_fp(), 0))->value(); |
| } else { |
| return GetNumberOfIncomingArguments(); |
| } |
| } |
| |
| |
| Code* JavaScriptFrame::unchecked_code() const { |
| JSFunction* function = JSFunction::cast(this->function()); |
| return function->unchecked_code(); |
| } |
| |
| |
| int JavaScriptFrame::GetNumberOfIncomingArguments() const { |
| ASSERT(!SafeStackFrameIterator::is_active(isolate()) && |
| isolate()->heap()->gc_state() == Heap::NOT_IN_GC); |
| |
| JSFunction* function = JSFunction::cast(this->function()); |
| return function->shared()->formal_parameter_count(); |
| } |
| |
| |
| Address JavaScriptFrame::GetCallerStackPointer() const { |
| return fp() + StandardFrameConstants::kCallerSPOffset; |
| } |
| |
| |
| void JavaScriptFrame::GetFunctions(List<JSFunction*>* functions) { |
| ASSERT(functions->length() == 0); |
| functions->Add(JSFunction::cast(function())); |
| } |
| |
| |
| void JavaScriptFrame::Summarize(List<FrameSummary>* functions) { |
| ASSERT(functions->length() == 0); |
| Code* code_pointer = LookupCode(); |
| int offset = static_cast<int>(pc() - code_pointer->address()); |
| FrameSummary summary(receiver(), |
| JSFunction::cast(function()), |
| code_pointer, |
| offset, |
| IsConstructor()); |
| functions->Add(summary); |
| } |
| |
| |
| void JavaScriptFrame::PrintTop(FILE* file, |
| bool print_args, |
| bool print_line_number) { |
| // constructor calls |
| HandleScope scope; |
| AssertNoAllocation no_allocation; |
| JavaScriptFrameIterator it; |
| while (!it.done()) { |
| if (it.frame()->is_java_script()) { |
| JavaScriptFrame* frame = it.frame(); |
| if (frame->IsConstructor()) PrintF(file, "new "); |
| // function name |
| Object* maybe_fun = frame->function(); |
| if (maybe_fun->IsJSFunction()) { |
| JSFunction* fun = JSFunction::cast(maybe_fun); |
| fun->PrintName(); |
| Code* js_code = frame->unchecked_code(); |
| Address pc = frame->pc(); |
| int code_offset = |
| static_cast<int>(pc - js_code->instruction_start()); |
| PrintF("+%d", code_offset); |
| SharedFunctionInfo* shared = fun->shared(); |
| if (print_line_number) { |
| Code* code = Code::cast( |
| v8::internal::Isolate::Current()->heap()->FindCodeObject(pc)); |
| int source_pos = code->SourcePosition(pc); |
| Object* maybe_script = shared->script(); |
| if (maybe_script->IsScript()) { |
| Handle<Script> script(Script::cast(maybe_script)); |
| int line = GetScriptLineNumberSafe(script, source_pos) + 1; |
| Object* script_name_raw = script->name(); |
| if (script_name_raw->IsString()) { |
| String* script_name = String::cast(script->name()); |
| SmartArrayPointer<char> c_script_name = |
| script_name->ToCString(DISALLOW_NULLS, |
| ROBUST_STRING_TRAVERSAL); |
| PrintF(file, " at %s:%d", *c_script_name, line); |
| } else { |
| PrintF(file, " at <unknown>:%d", line); |
| } |
| } else { |
| PrintF(file, " at <unknown>:<unknown>"); |
| } |
| } |
| } else { |
| PrintF("<unknown>"); |
| } |
| |
| if (print_args) { |
| // function arguments |
| // (we are intentionally only printing the actually |
| // supplied parameters, not all parameters required) |
| PrintF(file, "(this="); |
| frame->receiver()->ShortPrint(file); |
| const int length = frame->ComputeParametersCount(); |
| for (int i = 0; i < length; i++) { |
| PrintF(file, ", "); |
| frame->GetParameter(i)->ShortPrint(file); |
| } |
| PrintF(file, ")"); |
| } |
| break; |
| } |
| it.Advance(); |
| } |
| } |
| |
| |
| void FrameSummary::Print() { |
| PrintF("receiver: "); |
| receiver_->ShortPrint(); |
| PrintF("\nfunction: "); |
| function_->shared()->DebugName()->ShortPrint(); |
| PrintF("\ncode: "); |
| code_->ShortPrint(); |
| if (code_->kind() == Code::FUNCTION) PrintF(" NON-OPT"); |
| if (code_->kind() == Code::OPTIMIZED_FUNCTION) PrintF(" OPT"); |
| PrintF("\npc: %d\n", offset_); |
| } |
| |
| |
| JSFunction* OptimizedFrame::LiteralAt(FixedArray* literal_array, |
| int literal_id) { |
| if (literal_id == Translation::kSelfLiteralId) { |
| return JSFunction::cast(function()); |
| } |
| |
| return JSFunction::cast(literal_array->get(literal_id)); |
| } |
| |
| |
| void OptimizedFrame::Summarize(List<FrameSummary>* frames) { |
| ASSERT(frames->length() == 0); |
| ASSERT(is_optimized()); |
| |
| int deopt_index = Safepoint::kNoDeoptimizationIndex; |
| DeoptimizationInputData* data = GetDeoptimizationData(&deopt_index); |
| FixedArray* literal_array = data->LiteralArray(); |
| |
| // BUG(3243555): Since we don't have a lazy-deopt registered at |
| // throw-statements, we can't use the translation at the call-site of |
| // throw. An entry with no deoptimization index indicates a call-site |
| // without a lazy-deopt. As a consequence we are not allowed to inline |
| // functions containing throw. |
| if (deopt_index == Safepoint::kNoDeoptimizationIndex) { |
| JavaScriptFrame::Summarize(frames); |
| return; |
| } |
| |
| TranslationIterator it(data->TranslationByteArray(), |
| data->TranslationIndex(deopt_index)->value()); |
| Translation::Opcode opcode = static_cast<Translation::Opcode>(it.Next()); |
| ASSERT(opcode == Translation::BEGIN); |
| it.Next(); // Drop frame count. |
| int jsframe_count = it.Next(); |
| |
| // We create the summary in reverse order because the frames |
| // in the deoptimization translation are ordered bottom-to-top. |
| bool is_constructor = IsConstructor(); |
| int i = jsframe_count; |
| while (i > 0) { |
| opcode = static_cast<Translation::Opcode>(it.Next()); |
| if (opcode == Translation::JS_FRAME) { |
| i--; |
| BailoutId ast_id = BailoutId(it.Next()); |
| JSFunction* function = LiteralAt(literal_array, it.Next()); |
| it.Next(); // Skip height. |
| |
| // The translation commands are ordered and the receiver is always |
| // at the first position. Since we are always at a call when we need |
| // to construct a stack trace, the receiver is always in a stack slot. |
| opcode = static_cast<Translation::Opcode>(it.Next()); |
| ASSERT(opcode == Translation::STACK_SLOT || |
| opcode == Translation::LITERAL); |
| int index = it.Next(); |
| |
| // Get the correct receiver in the optimized frame. |
| Object* receiver = NULL; |
| if (opcode == Translation::LITERAL) { |
| receiver = data->LiteralArray()->get(index); |
| } else { |
| // Positive index means the value is spilled to the locals |
| // area. Negative means it is stored in the incoming parameter |
| // area. |
| if (index >= 0) { |
| receiver = GetExpression(index); |
| } else { |
| // Index -1 overlaps with last parameter, -n with the first parameter, |
| // (-n - 1) with the receiver with n being the number of parameters |
| // of the outermost, optimized frame. |
| int parameter_count = ComputeParametersCount(); |
| int parameter_index = index + parameter_count; |
| receiver = (parameter_index == -1) |
| ? this->receiver() |
| : this->GetParameter(parameter_index); |
| } |
| } |
| |
| Code* code = function->shared()->code(); |
| DeoptimizationOutputData* output_data = |
| DeoptimizationOutputData::cast(code->deoptimization_data()); |
| unsigned entry = Deoptimizer::GetOutputInfo(output_data, |
| ast_id, |
| function->shared()); |
| unsigned pc_offset = |
| FullCodeGenerator::PcField::decode(entry) + Code::kHeaderSize; |
| ASSERT(pc_offset > 0); |
| |
| FrameSummary summary(receiver, function, code, pc_offset, is_constructor); |
| frames->Add(summary); |
| is_constructor = false; |
| } else if (opcode == Translation::CONSTRUCT_STUB_FRAME) { |
| // The next encountered JS_FRAME will be marked as a constructor call. |
| it.Skip(Translation::NumberOfOperandsFor(opcode)); |
| ASSERT(!is_constructor); |
| is_constructor = true; |
| } else { |
| // Skip over operands to advance to the next opcode. |
| it.Skip(Translation::NumberOfOperandsFor(opcode)); |
| } |
| } |
| ASSERT(!is_constructor); |
| } |
| |
| |
| DeoptimizationInputData* OptimizedFrame::GetDeoptimizationData( |
| int* deopt_index) { |
| ASSERT(is_optimized()); |
| |
| JSFunction* opt_function = JSFunction::cast(function()); |
| Code* code = opt_function->code(); |
| |
| // The code object may have been replaced by lazy deoptimization. Fall |
| // back to a slow search in this case to find the original optimized |
| // code object. |
| if (!code->contains(pc())) { |
| code = isolate()->inner_pointer_to_code_cache()-> |
| GcSafeFindCodeForInnerPointer(pc()); |
| } |
| ASSERT(code != NULL); |
| ASSERT(code->kind() == Code::OPTIMIZED_FUNCTION); |
| |
| SafepointEntry safepoint_entry = code->GetSafepointEntry(pc()); |
| *deopt_index = safepoint_entry.deoptimization_index(); |
| ASSERT(*deopt_index != Safepoint::kNoDeoptimizationIndex); |
| |
| return DeoptimizationInputData::cast(code->deoptimization_data()); |
| } |
| |
| |
| int OptimizedFrame::GetInlineCount() { |
| ASSERT(is_optimized()); |
| |
| int deopt_index = Safepoint::kNoDeoptimizationIndex; |
| DeoptimizationInputData* data = GetDeoptimizationData(&deopt_index); |
| |
| TranslationIterator it(data->TranslationByteArray(), |
| data->TranslationIndex(deopt_index)->value()); |
| Translation::Opcode opcode = static_cast<Translation::Opcode>(it.Next()); |
| ASSERT(opcode == Translation::BEGIN); |
| USE(opcode); |
| it.Next(); // Drop frame count. |
| int jsframe_count = it.Next(); |
| return jsframe_count; |
| } |
| |
| |
| void OptimizedFrame::GetFunctions(List<JSFunction*>* functions) { |
| ASSERT(functions->length() == 0); |
| ASSERT(is_optimized()); |
| |
| int deopt_index = Safepoint::kNoDeoptimizationIndex; |
| DeoptimizationInputData* data = GetDeoptimizationData(&deopt_index); |
| FixedArray* literal_array = data->LiteralArray(); |
| |
| TranslationIterator it(data->TranslationByteArray(), |
| data->TranslationIndex(deopt_index)->value()); |
| Translation::Opcode opcode = static_cast<Translation::Opcode>(it.Next()); |
| ASSERT(opcode == Translation::BEGIN); |
| it.Next(); // Drop frame count. |
| int jsframe_count = it.Next(); |
| |
| // We insert the frames in reverse order because the frames |
| // in the deoptimization translation are ordered bottom-to-top. |
| while (jsframe_count > 0) { |
| opcode = static_cast<Translation::Opcode>(it.Next()); |
| if (opcode == Translation::JS_FRAME) { |
| jsframe_count--; |
| it.Next(); // Skip ast id. |
| JSFunction* function = LiteralAt(literal_array, it.Next()); |
| it.Next(); // Skip height. |
| functions->Add(function); |
| } else { |
| // Skip over operands to advance to the next opcode. |
| it.Skip(Translation::NumberOfOperandsFor(opcode)); |
| } |
| } |
| } |
| |
| |
| int ArgumentsAdaptorFrame::GetNumberOfIncomingArguments() const { |
| return Smi::cast(GetExpression(0))->value(); |
| } |
| |
| |
| Address ArgumentsAdaptorFrame::GetCallerStackPointer() const { |
| return fp() + StandardFrameConstants::kCallerSPOffset; |
| } |
| |
| |
| Address InternalFrame::GetCallerStackPointer() const { |
| // Internal frames have no arguments. The stack pointer of the |
| // caller is at a fixed offset from the frame pointer. |
| return fp() + StandardFrameConstants::kCallerSPOffset; |
| } |
| |
| |
| Code* ArgumentsAdaptorFrame::unchecked_code() const { |
| return isolate()->builtins()->builtin( |
| Builtins::kArgumentsAdaptorTrampoline); |
| } |
| |
| |
| Code* InternalFrame::unchecked_code() const { |
| const int offset = InternalFrameConstants::kCodeOffset; |
| Object* code = Memory::Object_at(fp() + offset); |
| ASSERT(code != NULL); |
| return reinterpret_cast<Code*>(code); |
| } |
| |
| |
| void StackFrame::PrintIndex(StringStream* accumulator, |
| PrintMode mode, |
| int index) { |
| accumulator->Add((mode == OVERVIEW) ? "%5d: " : "[%d]: ", index); |
| } |
| |
| |
| void JavaScriptFrame::Print(StringStream* accumulator, |
| PrintMode mode, |
| int index) const { |
| HandleScope scope; |
| Object* receiver = this->receiver(); |
| Object* function = this->function(); |
| |
| accumulator->PrintSecurityTokenIfChanged(function); |
| PrintIndex(accumulator, mode, index); |
| Code* code = NULL; |
| if (IsConstructor()) accumulator->Add("new "); |
| accumulator->PrintFunction(function, receiver, &code); |
| |
| // Get scope information for nicer output, if possible. If code is NULL, or |
| // doesn't contain scope info, scope_info will return 0 for the number of |
| // parameters, stack local variables, context local variables, stack slots, |
| // or context slots. |
| Handle<ScopeInfo> scope_info(ScopeInfo::Empty()); |
| |
| if (function->IsJSFunction()) { |
| Handle<SharedFunctionInfo> shared(JSFunction::cast(function)->shared()); |
| scope_info = Handle<ScopeInfo>(shared->scope_info()); |
| Object* script_obj = shared->script(); |
| if (script_obj->IsScript()) { |
| Handle<Script> script(Script::cast(script_obj)); |
| accumulator->Add(" ["); |
| accumulator->PrintName(script->name()); |
| |
| Address pc = this->pc(); |
| if (code != NULL && code->kind() == Code::FUNCTION && |
| pc >= code->instruction_start() && pc < code->instruction_end()) { |
| int source_pos = code->SourcePosition(pc); |
| int line = GetScriptLineNumberSafe(script, source_pos) + 1; |
| accumulator->Add(":%d", line); |
| } else { |
| int function_start_pos = shared->start_position(); |
| int line = GetScriptLineNumberSafe(script, function_start_pos) + 1; |
| accumulator->Add(":~%d", line); |
| } |
| |
| accumulator->Add("] "); |
| } |
| } |
| |
| accumulator->Add("(this=%o", receiver); |
| |
| // Print the parameters. |
| int parameters_count = ComputeParametersCount(); |
| for (int i = 0; i < parameters_count; i++) { |
| accumulator->Add(","); |
| // If we have a name for the parameter we print it. Nameless |
| // parameters are either because we have more actual parameters |
| // than formal parameters or because we have no scope information. |
| if (i < scope_info->ParameterCount()) { |
| accumulator->PrintName(scope_info->ParameterName(i)); |
| accumulator->Add("="); |
| } |
| accumulator->Add("%o", GetParameter(i)); |
| } |
| |
| accumulator->Add(")"); |
| if (mode == OVERVIEW) { |
| accumulator->Add("\n"); |
| return; |
| } |
| if (is_optimized()) { |
| accumulator->Add(" {\n// optimized frame\n}\n"); |
| return; |
| } |
| accumulator->Add(" {\n"); |
| |
| // Compute the number of locals and expression stack elements. |
| int stack_locals_count = scope_info->StackLocalCount(); |
| int heap_locals_count = scope_info->ContextLocalCount(); |
| int expressions_count = ComputeExpressionsCount(); |
| |
| // Print stack-allocated local variables. |
| if (stack_locals_count > 0) { |
| accumulator->Add(" // stack-allocated locals\n"); |
| } |
| for (int i = 0; i < stack_locals_count; i++) { |
| accumulator->Add(" var "); |
| accumulator->PrintName(scope_info->StackLocalName(i)); |
| accumulator->Add(" = "); |
| if (i < expressions_count) { |
| accumulator->Add("%o", GetExpression(i)); |
| } else { |
| accumulator->Add("// no expression found - inconsistent frame?"); |
| } |
| accumulator->Add("\n"); |
| } |
| |
| // Try to get hold of the context of this frame. |
| Context* context = NULL; |
| if (this->context() != NULL && this->context()->IsContext()) { |
| context = Context::cast(this->context()); |
| } |
| |
| // Print heap-allocated local variables. |
| if (heap_locals_count > 0) { |
| accumulator->Add(" // heap-allocated locals\n"); |
| } |
| for (int i = 0; i < heap_locals_count; i++) { |
| accumulator->Add(" var "); |
| accumulator->PrintName(scope_info->ContextLocalName(i)); |
| accumulator->Add(" = "); |
| if (context != NULL) { |
| if (i < context->length()) { |
| accumulator->Add("%o", context->get(Context::MIN_CONTEXT_SLOTS + i)); |
| } else { |
| accumulator->Add( |
| "// warning: missing context slot - inconsistent frame?"); |
| } |
| } else { |
| accumulator->Add("// warning: no context found - inconsistent frame?"); |
| } |
| accumulator->Add("\n"); |
| } |
| |
| // Print the expression stack. |
| int expressions_start = stack_locals_count; |
| if (expressions_start < expressions_count) { |
| accumulator->Add(" // expression stack (top to bottom)\n"); |
| } |
| for (int i = expressions_count - 1; i >= expressions_start; i--) { |
| if (IsExpressionInsideHandler(i)) continue; |
| accumulator->Add(" [%02d] : %o\n", i, GetExpression(i)); |
| } |
| |
| // Print details about the function. |
| if (FLAG_max_stack_trace_source_length != 0 && code != NULL) { |
| SharedFunctionInfo* shared = JSFunction::cast(function)->shared(); |
| accumulator->Add("--------- s o u r c e c o d e ---------\n"); |
| shared->SourceCodePrint(accumulator, FLAG_max_stack_trace_source_length); |
| accumulator->Add("\n-----------------------------------------\n"); |
| } |
| |
| accumulator->Add("}\n\n"); |
| } |
| |
| |
| void ArgumentsAdaptorFrame::Print(StringStream* accumulator, |
| PrintMode mode, |
| int index) const { |
| int actual = ComputeParametersCount(); |
| int expected = -1; |
| Object* function = this->function(); |
| if (function->IsJSFunction()) { |
| expected = JSFunction::cast(function)->shared()->formal_parameter_count(); |
| } |
| |
| PrintIndex(accumulator, mode, index); |
| accumulator->Add("arguments adaptor frame: %d->%d", actual, expected); |
| if (mode == OVERVIEW) { |
| accumulator->Add("\n"); |
| return; |
| } |
| accumulator->Add(" {\n"); |
| |
| // Print actual arguments. |
| if (actual > 0) accumulator->Add(" // actual arguments\n"); |
| for (int i = 0; i < actual; i++) { |
| accumulator->Add(" [%02d] : %o", i, GetParameter(i)); |
| if (expected != -1 && i >= expected) { |
| accumulator->Add(" // not passed to callee"); |
| } |
| accumulator->Add("\n"); |
| } |
| |
| accumulator->Add("}\n\n"); |
| } |
| |
| |
| void EntryFrame::Iterate(ObjectVisitor* v) const { |
| StackHandlerIterator it(this, top_handler()); |
| ASSERT(!it.done()); |
| StackHandler* handler = it.handler(); |
| ASSERT(handler->is_js_entry()); |
| handler->Iterate(v, LookupCode()); |
| #ifdef DEBUG |
| // Make sure that the entry frame does not contain more than one |
| // stack handler. |
| it.Advance(); |
| ASSERT(it.done()); |
| #endif |
| IteratePc(v, pc_address(), LookupCode()); |
| } |
| |
| |
| void StandardFrame::IterateExpressions(ObjectVisitor* v) const { |
| const int offset = StandardFrameConstants::kContextOffset; |
| Object** base = &Memory::Object_at(sp()); |
| Object** limit = &Memory::Object_at(fp() + offset) + 1; |
| for (StackHandlerIterator it(this, top_handler()); !it.done(); it.Advance()) { |
| StackHandler* handler = it.handler(); |
| // Traverse pointers down to - but not including - the next |
| // handler in the handler chain. Update the base to skip the |
| // handler and allow the handler to traverse its own pointers. |
| const Address address = handler->address(); |
| v->VisitPointers(base, reinterpret_cast<Object**>(address)); |
| base = reinterpret_cast<Object**>(address + StackHandlerConstants::kSize); |
| // Traverse the pointers in the handler itself. |
| handler->Iterate(v, LookupCode()); |
| } |
| v->VisitPointers(base, limit); |
| } |
| |
| |
| void JavaScriptFrame::Iterate(ObjectVisitor* v) const { |
| IterateExpressions(v); |
| IteratePc(v, pc_address(), LookupCode()); |
| } |
| |
| |
| void InternalFrame::Iterate(ObjectVisitor* v) const { |
| // Internal frames only have object pointers on the expression stack |
| // as they never have any arguments. |
| IterateExpressions(v); |
| IteratePc(v, pc_address(), LookupCode()); |
| } |
| |
| |
| // ------------------------------------------------------------------------- |
| |
| |
| JavaScriptFrame* StackFrameLocator::FindJavaScriptFrame(int n) { |
| ASSERT(n >= 0); |
| for (int i = 0; i <= n; i++) { |
| while (!iterator_.frame()->is_java_script()) iterator_.Advance(); |
| if (i == n) return JavaScriptFrame::cast(iterator_.frame()); |
| iterator_.Advance(); |
| } |
| UNREACHABLE(); |
| return NULL; |
| } |
| |
| |
| // ------------------------------------------------------------------------- |
| |
| |
| static Map* GcSafeMapOfCodeSpaceObject(HeapObject* object) { |
| MapWord map_word = object->map_word(); |
| return map_word.IsForwardingAddress() ? |
| map_word.ToForwardingAddress()->map() : map_word.ToMap(); |
| } |
| |
| |
| static int GcSafeSizeOfCodeSpaceObject(HeapObject* object) { |
| return object->SizeFromMap(GcSafeMapOfCodeSpaceObject(object)); |
| } |
| |
| |
| #ifdef DEBUG |
| static bool GcSafeCodeContains(HeapObject* code, Address addr) { |
| Map* map = GcSafeMapOfCodeSpaceObject(code); |
| ASSERT(map == code->GetHeap()->code_map()); |
| Address start = code->address(); |
| Address end = code->address() + code->SizeFromMap(map); |
| return start <= addr && addr < end; |
| } |
| #endif |
| |
| |
| Code* InnerPointerToCodeCache::GcSafeCastToCode(HeapObject* object, |
| Address inner_pointer) { |
| Code* code = reinterpret_cast<Code*>(object); |
| ASSERT(code != NULL && GcSafeCodeContains(code, inner_pointer)); |
| return code; |
| } |
| |
| |
| Code* InnerPointerToCodeCache::GcSafeFindCodeForInnerPointer( |
| Address inner_pointer) { |
| Heap* heap = isolate_->heap(); |
| // Check if the inner pointer points into a large object chunk. |
| LargePage* large_page = heap->lo_space()->FindPage(inner_pointer); |
| if (large_page != NULL) { |
| return GcSafeCastToCode(large_page->GetObject(), inner_pointer); |
| } |
| |
| // Iterate through the page until we reach the end or find an object starting |
| // after the inner pointer. |
| Page* page = Page::FromAddress(inner_pointer); |
| |
| Address addr = page->skip_list()->StartFor(inner_pointer); |
| |
| Address top = heap->code_space()->top(); |
| Address limit = heap->code_space()->limit(); |
| |
| while (true) { |
| if (addr == top && addr != limit) { |
| addr = limit; |
| continue; |
| } |
| |
| HeapObject* obj = HeapObject::FromAddress(addr); |
| int obj_size = GcSafeSizeOfCodeSpaceObject(obj); |
| Address next_addr = addr + obj_size; |
| if (next_addr > inner_pointer) return GcSafeCastToCode(obj, inner_pointer); |
| addr = next_addr; |
| } |
| } |
| |
| |
| InnerPointerToCodeCache::InnerPointerToCodeCacheEntry* |
| InnerPointerToCodeCache::GetCacheEntry(Address inner_pointer) { |
| isolate_->counters()->pc_to_code()->Increment(); |
| ASSERT(IsPowerOf2(kInnerPointerToCodeCacheSize)); |
| uint32_t hash = ComputeIntegerHash( |
| static_cast<uint32_t>(reinterpret_cast<uintptr_t>(inner_pointer)), |
| v8::internal::kZeroHashSeed); |
| uint32_t index = hash & (kInnerPointerToCodeCacheSize - 1); |
| InnerPointerToCodeCacheEntry* entry = cache(index); |
| if (entry->inner_pointer == inner_pointer) { |
| isolate_->counters()->pc_to_code_cached()->Increment(); |
| ASSERT(entry->code == GcSafeFindCodeForInnerPointer(inner_pointer)); |
| } else { |
| // Because this code may be interrupted by a profiling signal that |
| // also queries the cache, we cannot update inner_pointer before the code |
| // has been set. Otherwise, we risk trying to use a cache entry before |
| // the code has been computed. |
| entry->code = GcSafeFindCodeForInnerPointer(inner_pointer); |
| entry->safepoint_entry.Reset(); |
| entry->inner_pointer = inner_pointer; |
| } |
| return entry; |
| } |
| |
| |
| // ------------------------------------------------------------------------- |
| |
| int NumRegs(RegList reglist) { |
| return CompilerIntrinsics::CountSetBits(reglist); |
| } |
| |
| |
| struct JSCallerSavedCodeData { |
| int reg_code[kNumJSCallerSaved]; |
| }; |
| |
| JSCallerSavedCodeData caller_saved_code_data; |
| |
| void SetUpJSCallerSavedCodeData() { |
| int i = 0; |
| for (int r = 0; r < kNumRegs; r++) |
| if ((kJSCallerSaved & (1 << r)) != 0) |
| caller_saved_code_data.reg_code[i++] = r; |
| |
| ASSERT(i == kNumJSCallerSaved); |
| } |
| |
| int JSCallerSavedCode(int n) { |
| ASSERT(0 <= n && n < kNumJSCallerSaved); |
| return caller_saved_code_data.reg_code[n]; |
| } |
| |
| |
| #define DEFINE_WRAPPER(type, field) \ |
| class field##_Wrapper : public ZoneObject { \ |
| public: /* NOLINT */ \ |
| field##_Wrapper(const field& original) : frame_(original) { \ |
| } \ |
| field frame_; \ |
| }; |
| STACK_FRAME_TYPE_LIST(DEFINE_WRAPPER) |
| #undef DEFINE_WRAPPER |
| |
| static StackFrame* AllocateFrameCopy(StackFrame* frame, Zone* zone) { |
| #define FRAME_TYPE_CASE(type, field) \ |
| case StackFrame::type: { \ |
| field##_Wrapper* wrapper = \ |
| new(zone) field##_Wrapper(*(reinterpret_cast<field*>(frame))); \ |
| return &wrapper->frame_; \ |
| } |
| |
| switch (frame->type()) { |
| STACK_FRAME_TYPE_LIST(FRAME_TYPE_CASE) |
| default: UNREACHABLE(); |
| } |
| #undef FRAME_TYPE_CASE |
| return NULL; |
| } |
| |
| Vector<StackFrame*> CreateStackMap(Zone* zone) { |
| ZoneList<StackFrame*> list(10, zone); |
| for (StackFrameIterator it; !it.done(); it.Advance()) { |
| StackFrame* frame = AllocateFrameCopy(it.frame(), zone); |
| list.Add(frame, zone); |
| } |
| return list.ToVector(); |
| } |
| |
| |
| } } // namespace v8::internal |