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// Copyright 2017 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-stack-trace-iterator.h"
#include "src/api.h"
#include "src/debug/debug-evaluate.h"
#include "src/debug/debug-scope-iterator.h"
#include "src/debug/debug.h"
#include "src/debug/liveedit.h"
#include "src/frames-inl.h"
#include "src/isolate.h"
namespace v8 {
std::unique_ptr<debug::StackTraceIterator> debug::StackTraceIterator::Create(
v8::Isolate* isolate, int index) {
return std::unique_ptr<debug::StackTraceIterator>(
new internal::DebugStackTraceIterator(
reinterpret_cast<internal::Isolate*>(isolate), index));
}
namespace internal {
DebugStackTraceIterator::DebugStackTraceIterator(Isolate* isolate, int index)
: isolate_(isolate),
iterator_(isolate, isolate->debug()->break_frame_id()),
is_top_frame_(true) {
if (iterator_.done()) return;
std::vector<FrameSummary> frames;
frames.reserve(FLAG_max_inlining_levels + 1);
iterator_.frame()->Summarize(&frames);
inlined_frame_index_ = static_cast<int>(frames.size());
Advance();
for (; !Done() && index > 0; --index) Advance();
}
DebugStackTraceIterator::~DebugStackTraceIterator() {}
bool DebugStackTraceIterator::Done() const { return iterator_.done(); }
void DebugStackTraceIterator::Advance() {
while (true) {
--inlined_frame_index_;
for (; inlined_frame_index_ >= 0; --inlined_frame_index_) {
// Omit functions from native and extension scripts.
if (FrameSummary::Get(iterator_.frame(), inlined_frame_index_)
.is_subject_to_debugging()) {
break;
}
is_top_frame_ = false;
}
if (inlined_frame_index_ >= 0) {
frame_inspector_.reset(new FrameInspector(
iterator_.frame(), inlined_frame_index_, isolate_));
break;
}
is_top_frame_ = false;
frame_inspector_.reset();
iterator_.Advance();
if (iterator_.done()) break;
std::vector<FrameSummary> frames;
frames.reserve(FLAG_max_inlining_levels + 1);
iterator_.frame()->Summarize(&frames);
inlined_frame_index_ = static_cast<int>(frames.size());
}
}
int DebugStackTraceIterator::GetContextId() const {
DCHECK(!Done());
Handle<Object> context = frame_inspector_->GetContext();
if (context->IsContext()) {
Object* value =
Context::cast(*context)->native_context()->debug_context_id();
if (value->IsSmi()) return Smi::ToInt(value);
}
return 0;
}
v8::Local<v8::Value> DebugStackTraceIterator::GetReceiver() const {
DCHECK(!Done());
Handle<Object> value = frame_inspector_->GetReceiver();
if (value.is_null() || (value->IsSmi() || !value->IsTheHole(isolate_))) {
return Utils::ToLocal(value);
}
return v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate_));
}
v8::Local<v8::Value> DebugStackTraceIterator::GetReturnValue() const {
DCHECK(!Done());
if (frame_inspector_->IsWasm()) return v8::Local<v8::Value>();
bool is_optimized = iterator_.frame()->is_optimized();
if (is_optimized || !is_top_frame_ ||
!isolate_->debug()->IsBreakAtReturn(iterator_.javascript_frame())) {
return v8::Local<v8::Value>();
}
return Utils::ToLocal(isolate_->debug()->return_value_handle());
}
v8::Local<v8::String> DebugStackTraceIterator::GetFunctionName() const {
DCHECK(!Done());
return Utils::ToLocal(frame_inspector_->GetFunctionName());
}
v8::Local<v8::debug::Script> DebugStackTraceIterator::GetScript() const {
DCHECK(!Done());
Handle<Object> value = frame_inspector_->GetScript();
if (!value->IsScript()) return v8::Local<v8::debug::Script>();
return ToApiHandle<debug::Script>(Handle<Script>::cast(value));
}
debug::Location DebugStackTraceIterator::GetSourceLocation() const {
DCHECK(!Done());
v8::Local<v8::debug::Script> script = GetScript();
if (script.IsEmpty()) return v8::debug::Location();
return script->GetSourceLocation(frame_inspector_->GetSourcePosition());
}
v8::Local<v8::Function> DebugStackTraceIterator::GetFunction() const {
DCHECK(!Done());
if (!frame_inspector_->IsJavaScript()) return v8::Local<v8::Function>();
return Utils::ToLocal(frame_inspector_->GetFunction());
}
std::unique_ptr<v8::debug::ScopeIterator>
DebugStackTraceIterator::GetScopeIterator() const {
DCHECK(!Done());
StandardFrame* frame = iterator_.frame();
if (frame->is_wasm_interpreter_entry()) {
return std::unique_ptr<v8::debug::ScopeIterator>(new DebugWasmScopeIterator(
isolate_, iterator_.frame(), inlined_frame_index_));
}
return std::unique_ptr<v8::debug::ScopeIterator>(
new DebugScopeIterator(isolate_, frame_inspector_.get()));
}
bool DebugStackTraceIterator::Restart() {
DCHECK(!Done());
if (iterator_.is_wasm()) return false;
return !LiveEdit::RestartFrame(iterator_.javascript_frame());
}
v8::MaybeLocal<v8::Value> DebugStackTraceIterator::Evaluate(
v8::Local<v8::String> source, bool throw_on_side_effect) {
DCHECK(!Done());
Handle<Object> value;
if (!DebugEvaluate::Local(isolate_, iterator_.frame()->id(),
inlined_frame_index_, Utils::OpenHandle(*source),
throw_on_side_effect)
.ToHandle(&value)) {
isolate_->OptionalRescheduleException(false);
return v8::MaybeLocal<v8::Value>();
}
return Utils::ToLocal(value);
}
} // namespace internal
} // namespace v8
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