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// 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/accessors.h"
#include "src/frames-inl.h"
#include "src/wasm/wasm-interpreter.h"
#include "src/wasm/wasm-objects-inl.h"
namespace v8 {
namespace internal {
FrameInspector::FrameInspector(StandardFrame* frame, int inlined_frame_index,
Isolate* isolate)
: frame_(frame),
isolate_(isolate) {
// Extract the relevant information from the frame summary and discard it.
FrameSummary summary = FrameSummary::Get(frame, inlined_frame_index);
is_constructor_ = summary.is_constructor();
source_position_ = summary.SourcePosition();
function_name_ = summary.FunctionName();
script_ = Handle<Script>::cast(summary.script());
receiver_ = summary.receiver();
if (summary.IsJavaScript()) {
function_ = summary.AsJavaScript().function();
}
JavaScriptFrame* js_frame =
frame->is_java_script() ? javascript_frame() : nullptr;
DCHECK(js_frame || frame->is_wasm());
has_adapted_arguments_ = js_frame && js_frame->has_adapted_arguments();
is_optimized_ = frame_->is_optimized();
is_interpreted_ = frame_->is_interpreted();
// Calculate the deoptimized frame.
if (is_optimized_) {
DCHECK_NOT_NULL(js_frame);
deoptimized_frame_.reset(Deoptimizer::DebuggerInspectableFrame(
js_frame, inlined_frame_index, isolate));
} else if (frame_->is_wasm_interpreter_entry()) {
wasm_interpreted_frame_ =
summary.AsWasm().wasm_instance()->debug_info()->GetInterpretedFrame(
frame_->fp(), inlined_frame_index);
DCHECK(wasm_interpreted_frame_);
}
}
FrameInspector::~FrameInspector() {
// Destructor needs to be defined in the .cc file, because it instantiates
// std::unique_ptr destructors but the types are not known in the header.
}
int FrameInspector::GetParametersCount() {
if (is_optimized_) return deoptimized_frame_->parameters_count();
if (wasm_interpreted_frame_)
return wasm_interpreted_frame_->GetParameterCount();
return frame_->ComputeParametersCount();
}
Handle<Object> FrameInspector::GetParameter(int index) {
if (is_optimized_) return deoptimized_frame_->GetParameter(index);
// TODO(clemensh): Handle wasm_interpreted_frame_.
return handle(frame_->GetParameter(index), isolate_);
}
Handle<Object> FrameInspector::GetExpression(int index) {
return is_optimized_ ? deoptimized_frame_->GetExpression(index)
: handle(frame_->GetExpression(index), isolate_);
}
Handle<Object> FrameInspector::GetContext() {
return deoptimized_frame_ ? deoptimized_frame_->GetContext()
: handle(frame_->context(), isolate_);
}
bool FrameInspector::IsWasm() { return frame_->is_wasm(); }
bool FrameInspector::IsJavaScript() { return frame_->is_java_script(); }
// To inspect all the provided arguments the frame might need to be
// replaced with the arguments frame.
void FrameInspector::SetArgumentsFrame(StandardFrame* frame) {
DCHECK(has_adapted_arguments_);
DCHECK(frame->is_arguments_adaptor());
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,
bool materialize_arguments_object) {
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(isolate_));
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(isolate_)) {
value = isolate_->factory()->undefined_value();
}
if (value->IsOptimizedOut(isolate_)) {
if (materialize_arguments_object) {
Handle<String> arguments_str = isolate_->factory()->arguments_string();
if (String::Equals(name, arguments_str)) continue;
}
value = isolate_->factory()->undefined_value();
}
JSObject::SetOwnPropertyIgnoreAttributes(target, name, value, NONE).Check();
}
}
void FrameInspector::UpdateStackLocalsFromMaterializedObject(
Handle<JSObject> target, Handle<ScopeInfo> scope_info) {
// Optimized frames and wasm frames are not supported. Simply give up.
if (is_optimized_ || frame_->is_wasm()) 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(!javascript_frame()->GetParameter(i)->IsTheHole(isolate_));
Handle<Object> value =
Object::GetPropertyOrElement(target, name).ToHandleChecked();
javascript_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(isolate_)) 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,
StandardFrame* frame) {
SaveContext* save = isolate->save_context();
while (save != nullptr && !save->IsBelowFrame(frame)) {
save = save->prev();
}
DCHECK(save != nullptr);
return save;
}
int DebugFrameHelper::FindIndexedNonNativeFrame(StackTraceFrameIterator* it,
int index) {
int count = -1;
for (; !it->done(); it->Advance()) {
std::vector<FrameSummary> frames;
it->frame()->Summarize(&frames);
for (size_t i = frames.size(); i != 0; i--) {
// Omit functions from native and extension scripts.
if (!frames[i - 1].is_subject_to_debugging()) continue;
if (++count == index) return static_cast<int>(i) - 1;
}
}
return -1;
}
} // namespace internal
} // namespace v8
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