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debug-scope-iterator.cc
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220 lines (186 loc) · 7.12 KB
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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-scope-iterator.h"
#include "src/api/api-inl.h"
#include "src/debug/debug.h"
#include "src/debug/liveedit.h"
#include "src/execution/frames-inl.h"
#include "src/execution/isolate.h"
#include "src/objects/js-generator-inl.h"
#include "src/wasm/wasm-debug.h"
#include "src/wasm/wasm-objects-inl.h"
namespace v8 {
std::unique_ptr<debug::ScopeIterator> debug::ScopeIterator::CreateForFunction(
v8::Isolate* v8_isolate, v8::Local<v8::Function> v8_func) {
internal::Handle<internal::JSReceiver> receiver =
internal::Handle<internal::JSReceiver>::cast(Utils::OpenHandle(*v8_func));
// Besides JSFunction and JSBoundFunction, {v8_func} could be an
// ObjectTemplate with a CallAsFunctionHandler. We only handle plain
// JSFunctions.
if (!receiver->IsJSFunction()) return nullptr;
internal::Handle<internal::JSFunction> function =
internal::Handle<internal::JSFunction>::cast(receiver);
// Blink has function objects with callable map, JS_SPECIAL_API_OBJECT_TYPE
// but without context on heap.
if (!function->has_context()) return nullptr;
return std::unique_ptr<debug::ScopeIterator>(new internal::DebugScopeIterator(
reinterpret_cast<internal::Isolate*>(v8_isolate), function));
}
std::unique_ptr<debug::ScopeIterator>
debug::ScopeIterator::CreateForGeneratorObject(
v8::Isolate* v8_isolate, v8::Local<v8::Object> v8_generator) {
internal::Handle<internal::Object> generator =
Utils::OpenHandle(*v8_generator);
DCHECK(generator->IsJSGeneratorObject());
return std::unique_ptr<debug::ScopeIterator>(new internal::DebugScopeIterator(
reinterpret_cast<internal::Isolate*>(v8_isolate),
internal::Handle<internal::JSGeneratorObject>::cast(generator)));
}
namespace internal {
DebugScopeIterator::DebugScopeIterator(Isolate* isolate,
FrameInspector* frame_inspector)
: iterator_(
isolate, frame_inspector,
::v8::internal::ScopeIterator::ReparseStrategy::kFunctionLiteral) {
if (!Done() && ShouldIgnore()) Advance();
}
DebugScopeIterator::DebugScopeIterator(Isolate* isolate,
Handle<JSFunction> function)
: iterator_(isolate, function) {
if (!Done() && ShouldIgnore()) Advance();
}
DebugScopeIterator::DebugScopeIterator(Isolate* isolate,
Handle<JSGeneratorObject> generator)
: iterator_(isolate, generator) {
if (!Done() && ShouldIgnore()) Advance();
}
bool DebugScopeIterator::Done() { return iterator_.Done(); }
void DebugScopeIterator::Advance() {
DCHECK(!Done());
iterator_.Next();
while (!Done() && ShouldIgnore()) {
iterator_.Next();
}
}
bool DebugScopeIterator::ShouldIgnore() {
if (GetType() == debug::ScopeIterator::ScopeTypeLocal) return false;
return !iterator_.DeclaresLocals(i::ScopeIterator::Mode::ALL);
}
v8::debug::ScopeIterator::ScopeType DebugScopeIterator::GetType() {
DCHECK(!Done());
return static_cast<v8::debug::ScopeIterator::ScopeType>(iterator_.Type());
}
v8::Local<v8::Object> DebugScopeIterator::GetObject() {
DCHECK(!Done());
Handle<JSObject> value = iterator_.ScopeObject(i::ScopeIterator::Mode::ALL);
return Utils::ToLocal(value);
}
int DebugScopeIterator::GetScriptId() {
DCHECK(!Done());
return iterator_.GetScript()->id();
}
v8::Local<v8::Value> DebugScopeIterator::GetFunctionDebugName() {
DCHECK(!Done());
Handle<Object> name = iterator_.GetFunctionDebugName();
return Utils::ToLocal(name);
}
bool DebugScopeIterator::HasLocationInfo() {
return iterator_.HasPositionInfo();
}
debug::Location DebugScopeIterator::GetStartLocation() {
DCHECK(!Done());
return ToApiHandle<v8::debug::Script>(iterator_.GetScript())
->GetSourceLocation(iterator_.start_position());
}
debug::Location DebugScopeIterator::GetEndLocation() {
DCHECK(!Done());
return ToApiHandle<v8::debug::Script>(iterator_.GetScript())
->GetSourceLocation(iterator_.end_position());
}
bool DebugScopeIterator::SetVariableValue(v8::Local<v8::String> name,
v8::Local<v8::Value> value) {
DCHECK(!Done());
return iterator_.SetVariableValue(Utils::OpenHandle(*name),
Utils::OpenHandle(*value));
}
DebugWasmScopeIterator::DebugWasmScopeIterator(Isolate* isolate,
WasmFrame* frame)
: isolate_(isolate),
frame_(frame),
type_(debug::ScopeIterator::ScopeTypeModule) {}
bool DebugWasmScopeIterator::Done() {
return type_ == debug::ScopeIterator::ScopeTypeWith;
}
void DebugWasmScopeIterator::Advance() {
DCHECK(!Done());
switch (type_) {
case ScopeTypeModule:
// Skip local scope and expression stack scope if the frame is not
// inspectable.
type_ = frame_->is_inspectable() ? debug::ScopeIterator::ScopeTypeLocal
: debug::ScopeIterator::ScopeTypeWith;
break;
case ScopeTypeLocal:
type_ = debug::ScopeIterator::ScopeTypeWasmExpressionStack;
break;
case ScopeTypeWasmExpressionStack:
// We use ScopeTypeWith type as marker for done.
type_ = debug::ScopeIterator::ScopeTypeWith;
break;
default:
UNREACHABLE();
}
}
v8::debug::ScopeIterator::ScopeType DebugWasmScopeIterator::GetType() {
DCHECK(!Done());
return type_;
}
v8::Local<v8::Object> DebugWasmScopeIterator::GetObject() {
DCHECK(!Done());
switch (type_) {
case debug::ScopeIterator::ScopeTypeModule: {
Handle<WasmInstanceObject> instance =
FrameSummary::GetTop(frame_).AsWasm().wasm_instance();
return Utils::ToLocal(wasm::GetModuleScopeObject(instance));
}
case debug::ScopeIterator::ScopeTypeLocal: {
DCHECK(frame_->is_wasm());
wasm::DebugInfo* debug_info = frame_->native_module()->GetDebugInfo();
return Utils::ToLocal(debug_info->GetLocalScopeObject(
isolate_, frame_->pc(), frame_->fp(), frame_->callee_fp()));
}
case debug::ScopeIterator::ScopeTypeWasmExpressionStack: {
DCHECK(frame_->is_wasm());
wasm::DebugInfo* debug_info = frame_->native_module()->GetDebugInfo();
return Utils::ToLocal(debug_info->GetStackScopeObject(
isolate_, frame_->pc(), frame_->fp(), frame_->callee_fp()));
}
default:
return {};
}
}
int DebugWasmScopeIterator::GetScriptId() {
DCHECK(!Done());
return -1;
}
v8::Local<v8::Value> DebugWasmScopeIterator::GetFunctionDebugName() {
DCHECK(!Done());
return Utils::ToLocal(isolate_->factory()->empty_string());
}
bool DebugWasmScopeIterator::HasLocationInfo() { return false; }
debug::Location DebugWasmScopeIterator::GetStartLocation() {
DCHECK(!Done());
return debug::Location();
}
debug::Location DebugWasmScopeIterator::GetEndLocation() {
DCHECK(!Done());
return debug::Location();
}
bool DebugWasmScopeIterator::SetVariableValue(v8::Local<v8::String> name,
v8::Local<v8::Value> value) {
DCHECK(!Done());
return false;
}
} // namespace internal
} // namespace v8