| // Copyright 2015 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/debug/debug-frames.h" |
| |
| #include "src/frames-inl.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| FrameInspector::FrameInspector(JavaScriptFrame* frame, |
| int inlined_jsframe_index, Isolate* isolate) |
| : frame_(frame), deoptimized_frame_(NULL), isolate_(isolate) { |
| has_adapted_arguments_ = frame_->has_adapted_arguments(); |
| is_bottommost_ = inlined_jsframe_index == 0; |
| is_optimized_ = frame_->is_optimized(); |
| is_interpreted_ = frame_->is_interpreted(); |
| // Calculate the deoptimized frame. |
| if (frame->is_optimized()) { |
| // TODO(turbofan): Revisit once we support deoptimization. |
| if (frame->LookupCode()->is_turbofanned() && |
| frame->function()->shared()->asm_function() && |
| !FLAG_turbo_asm_deoptimization) { |
| is_optimized_ = false; |
| return; |
| } |
| |
| deoptimized_frame_ = Deoptimizer::DebuggerInspectableFrame( |
| frame, inlined_jsframe_index, isolate); |
| } |
| } |
| |
| |
| FrameInspector::~FrameInspector() { |
| // Get rid of the calculated deoptimized frame if any. |
| if (deoptimized_frame_ != NULL) { |
| Deoptimizer::DeleteDebuggerInspectableFrame(deoptimized_frame_, isolate_); |
| } |
| } |
| |
| |
| int FrameInspector::GetParametersCount() { |
| return is_optimized_ ? deoptimized_frame_->parameters_count() |
| : frame_->ComputeParametersCount(); |
| } |
| |
| Handle<Object> FrameInspector::GetFunction() { |
| return is_optimized_ ? deoptimized_frame_->GetFunction() |
| : handle(frame_->function(), isolate_); |
| } |
| |
| Handle<Object> FrameInspector::GetParameter(int index) { |
| return is_optimized_ ? deoptimized_frame_->GetParameter(index) |
| : handle(frame_->GetParameter(index), isolate_); |
| } |
| |
| Handle<Object> FrameInspector::GetExpression(int index) { |
| // TODO(turbofan): Revisit once we support deoptimization. |
| if (frame_->LookupCode()->is_turbofanned() && |
| frame_->function()->shared()->asm_function() && |
| !FLAG_turbo_asm_deoptimization) { |
| return isolate_->factory()->undefined_value(); |
| } |
| return is_optimized_ ? deoptimized_frame_->GetExpression(index) |
| : handle(frame_->GetExpression(index), isolate_); |
| } |
| |
| |
| int FrameInspector::GetSourcePosition() { |
| if (is_optimized_) { |
| return deoptimized_frame_->GetSourcePosition(); |
| } else if (is_interpreted_) { |
| InterpretedFrame* frame = reinterpret_cast<InterpretedFrame*>(frame_); |
| BytecodeArray* bytecode_array = frame->GetBytecodeArray(); |
| return bytecode_array->SourcePosition(frame->GetBytecodeOffset()); |
| } else { |
| Code* code = frame_->LookupCode(); |
| int offset = static_cast<int>(frame_->pc() - code->instruction_start()); |
| return code->SourcePosition(offset); |
| } |
| } |
| |
| |
| bool FrameInspector::IsConstructor() { |
| return is_optimized_ && !is_bottommost_ |
| ? deoptimized_frame_->HasConstructStub() |
| : frame_->IsConstructor(); |
| } |
| |
| Handle<Object> FrameInspector::GetContext() { |
| return is_optimized_ ? deoptimized_frame_->GetContext() |
| : handle(frame_->context(), isolate_); |
| } |
| |
| |
| // To inspect all the provided arguments the frame might need to be |
| // replaced with the arguments frame. |
| void FrameInspector::SetArgumentsFrame(JavaScriptFrame* frame) { |
| DCHECK(has_adapted_arguments_); |
| frame_ = frame; |
| is_optimized_ = frame_->is_optimized(); |
| is_interpreted_ = frame_->is_interpreted(); |
| DCHECK(!is_optimized_); |
| } |
| |
| |
| // Create a plain JSObject which materializes the local scope for the specified |
| // frame. |
| void FrameInspector::MaterializeStackLocals(Handle<JSObject> target, |
| Handle<ScopeInfo> scope_info) { |
| HandleScope scope(isolate_); |
| // First fill all parameters. |
| for (int i = 0; i < scope_info->ParameterCount(); ++i) { |
| // Do not materialize the parameter if it is shadowed by a context local. |
| // TODO(yangguo): check whether this is necessary, now that we materialize |
| // context locals as well. |
| Handle<String> name(scope_info->ParameterName(i)); |
| if (ScopeInfo::VariableIsSynthetic(*name)) continue; |
| if (ParameterIsShadowedByContextLocal(scope_info, name)) continue; |
| |
| Handle<Object> value = |
| i < GetParametersCount() |
| ? GetParameter(i) |
| : Handle<Object>::cast(isolate_->factory()->undefined_value()); |
| DCHECK(!value->IsTheHole()); |
| |
| JSObject::SetOwnPropertyIgnoreAttributes(target, name, value, NONE).Check(); |
| } |
| |
| // Second fill all stack locals. |
| for (int i = 0; i < scope_info->StackLocalCount(); ++i) { |
| Handle<String> name(scope_info->StackLocalName(i)); |
| if (ScopeInfo::VariableIsSynthetic(*name)) continue; |
| Handle<Object> value = GetExpression(scope_info->StackLocalIndex(i)); |
| // TODO(yangguo): We convert optimized out values to {undefined} when they |
| // are passed to the debugger. Eventually we should handle them somehow. |
| if (value->IsTheHole()) value = isolate_->factory()->undefined_value(); |
| if (value->IsOptimizedOut()) value = isolate_->factory()->undefined_value(); |
| JSObject::SetOwnPropertyIgnoreAttributes(target, name, value, NONE).Check(); |
| } |
| } |
| |
| |
| void FrameInspector::MaterializeStackLocals(Handle<JSObject> target, |
| Handle<JSFunction> function) { |
| Handle<SharedFunctionInfo> shared(function->shared()); |
| Handle<ScopeInfo> scope_info(shared->scope_info()); |
| MaterializeStackLocals(target, scope_info); |
| } |
| |
| |
| void FrameInspector::UpdateStackLocalsFromMaterializedObject( |
| Handle<JSObject> target, Handle<ScopeInfo> scope_info) { |
| if (is_optimized_) { |
| // Optimized frames are not supported. Simply give up. |
| return; |
| } |
| |
| HandleScope scope(isolate_); |
| |
| // Parameters. |
| for (int i = 0; i < scope_info->ParameterCount(); ++i) { |
| // Shadowed parameters were not materialized. |
| Handle<String> name(scope_info->ParameterName(i)); |
| if (ScopeInfo::VariableIsSynthetic(*name)) continue; |
| if (ParameterIsShadowedByContextLocal(scope_info, name)) continue; |
| |
| DCHECK(!frame_->GetParameter(i)->IsTheHole()); |
| Handle<Object> value = |
| Object::GetPropertyOrElement(target, name).ToHandleChecked(); |
| frame_->SetParameterValue(i, *value); |
| } |
| |
| // Stack locals. |
| for (int i = 0; i < scope_info->StackLocalCount(); ++i) { |
| Handle<String> name(scope_info->StackLocalName(i)); |
| if (ScopeInfo::VariableIsSynthetic(*name)) continue; |
| int index = scope_info->StackLocalIndex(i); |
| if (frame_->GetExpression(index)->IsTheHole()) continue; |
| Handle<Object> value = |
| Object::GetPropertyOrElement(target, name).ToHandleChecked(); |
| frame_->SetExpression(index, *value); |
| } |
| } |
| |
| |
| bool FrameInspector::ParameterIsShadowedByContextLocal( |
| Handle<ScopeInfo> info, Handle<String> parameter_name) { |
| VariableMode mode; |
| InitializationFlag init_flag; |
| MaybeAssignedFlag maybe_assigned_flag; |
| return ScopeInfo::ContextSlotIndex(info, parameter_name, &mode, &init_flag, |
| &maybe_assigned_flag) != -1; |
| } |
| |
| |
| SaveContext* DebugFrameHelper::FindSavedContextForFrame( |
| Isolate* isolate, JavaScriptFrame* frame) { |
| SaveContext* save = isolate->save_context(); |
| while (save != NULL && !save->IsBelowFrame(frame)) { |
| save = save->prev(); |
| } |
| DCHECK(save != NULL); |
| return save; |
| } |
| |
| |
| int DebugFrameHelper::FindIndexedNonNativeFrame(JavaScriptFrameIterator* it, |
| int index) { |
| int count = -1; |
| for (; !it->done(); it->Advance()) { |
| List<FrameSummary> frames(FLAG_max_inlining_levels + 1); |
| it->frame()->Summarize(&frames); |
| for (int i = frames.length() - 1; i >= 0; i--) { |
| // Omit functions from native and extension scripts. |
| if (!frames[i].function()->shared()->IsSubjectToDebugging()) continue; |
| if (++count == index) return i; |
| } |
| } |
| return -1; |
| } |
| |
| |
| } // namespace internal |
| } // namespace v8 |