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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/builtins/accessors.h"
#include "src/deoptimizer/deoptimizer.h"
#include "src/execution/frames-inl.h"
#if V8_ENABLE_WEBASSEMBLY
#include "src/debug/debug-wasm-objects.h"
#endif // V8_ENABLE_WEBASSEMBLY
namespace v8 {
namespace internal {
FrameInspector::FrameInspector(CommonFrame* frame, int inlined_frame_index,
Isolate* isolate)
: frame_(frame),
inlined_frame_index_(inlined_frame_index),
isolate_(isolate) {
// Extract the relevant information from the frame summary and discard it.
FrameSummary summary = FrameSummary::Get(frame, inlined_frame_index);
summary.EnsureSourcePositionsAvailable();
is_constructor_ = summary.is_constructor();
source_position_ = summary.SourcePosition();
script_ = Handle<Script>::cast(summary.script());
receiver_ = summary.receiver();
if (summary.IsJavaScript()) {
function_ = summary.AsJavaScript().function();
}
#if V8_ENABLE_WEBASSEMBLY
JavaScriptFrame* js_frame =
frame->is_java_script() ? javascript_frame() : nullptr;
DCHECK(js_frame || frame->is_wasm());
#else
JavaScriptFrame* js_frame = javascript_frame();
#endif // V8_ENABLE_WEBASSEMBLY
is_optimized_ = frame_->is_optimized();
// Calculate the deoptimized frame.
if (is_optimized_) {
DCHECK_NOT_NULL(js_frame);
deoptimized_frame_.reset(Deoptimizer::DebuggerInspectableFrame(
js_frame, inlined_frame_index, isolate));
}
}
// 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.
FrameInspector::~FrameInspector() = default;
JavaScriptFrame* FrameInspector::javascript_frame() {
return JavaScriptFrame::cast(frame_);
}
Handle<Object> FrameInspector::GetParameter(int index) {
if (is_optimized_) return deoptimized_frame_->GetParameter(index);
DCHECK(IsJavaScript());
return handle(javascript_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_);
}
Handle<String> FrameInspector::GetFunctionName() {
#if V8_ENABLE_WEBASSEMBLY
if (IsWasm()) {
auto wasm_frame = WasmFrame::cast(frame_);
auto wasm_instance = handle(wasm_frame->wasm_instance(), isolate_);
return GetWasmFunctionDebugName(isolate_, wasm_instance,
wasm_frame->function_index());
}
#endif // V8_ENABLE_WEBASSEMBLY
return JSFunction::GetDebugName(function_);
}
#if V8_ENABLE_WEBASSEMBLY
bool FrameInspector::IsWasm() { return frame_->is_wasm(); }
#endif // V8_ENABLE_WEBASSEMBLY
bool FrameInspector::IsJavaScript() { return frame_->is_java_script(); }
bool FrameInspector::ParameterIsShadowedByContextLocal(
Handle<ScopeInfo> info, Handle<String> parameter_name) {
VariableLookupResult lookup_result;
return ScopeInfo::ContextSlotIndex(*info, *parameter_name, &lookup_result) !=
-1;
}
RedirectActiveFunctions::RedirectActiveFunctions(SharedFunctionInfo shared,
Mode mode)
: shared_(shared), mode_(mode) {
DCHECK(shared.HasBytecodeArray());
if (mode == Mode::kUseDebugBytecode) {
DCHECK(shared.HasDebugInfo());
}
}
void RedirectActiveFunctions::VisitThread(Isolate* isolate,
ThreadLocalTop* top) {
for (JavaScriptFrameIterator it(isolate, top); !it.done(); it.Advance()) {
JavaScriptFrame* frame = it.frame();
JSFunction function = frame->function();
if (!frame->is_interpreted()) continue;
if (function.shared() != shared_) continue;
InterpretedFrame* interpreted_frame =
reinterpret_cast<InterpretedFrame*>(frame);
BytecodeArray bytecode = mode_ == Mode::kUseDebugBytecode
? shared_.GetDebugInfo().DebugBytecodeArray()
: shared_.GetBytecodeArray(isolate);
interpreted_frame->PatchBytecodeArray(bytecode);
}
}
} // namespace internal
} // namespace v8
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