1 // Copyright 2015 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "src/debug/debug-frames.h"
6
7 #include "src/accessors.h"
8 #include "src/frames-inl.h"
9 #include "src/wasm/wasm-interpreter.h"
10 #include "src/wasm/wasm-objects-inl.h"
11
12 namespace v8 {
13 namespace internal {
14
FrameInspector(StandardFrame * frame,int inlined_frame_index,Isolate * isolate)15 FrameInspector::FrameInspector(StandardFrame* frame, int inlined_frame_index,
16 Isolate* isolate)
17 : frame_(frame),
18 inlined_frame_index_(inlined_frame_index),
19 isolate_(isolate) {
20 // Extract the relevant information from the frame summary and discard it.
21 FrameSummary summary = FrameSummary::Get(frame, inlined_frame_index);
22
23 is_constructor_ = summary.is_constructor();
24 source_position_ = summary.SourcePosition();
25 function_name_ = summary.FunctionName();
26 script_ = Handle<Script>::cast(summary.script());
27 receiver_ = summary.receiver();
28
29 if (summary.IsJavaScript()) {
30 function_ = summary.AsJavaScript().function();
31 }
32
33 JavaScriptFrame* js_frame =
34 frame->is_java_script() ? javascript_frame() : nullptr;
35 DCHECK(js_frame || frame->is_wasm());
36 has_adapted_arguments_ = js_frame && js_frame->has_adapted_arguments();
37 is_optimized_ = frame_->is_optimized();
38 is_interpreted_ = frame_->is_interpreted();
39
40 // Calculate the deoptimized frame.
41 if (is_optimized_) {
42 DCHECK_NOT_NULL(js_frame);
43 deoptimized_frame_.reset(Deoptimizer::DebuggerInspectableFrame(
44 js_frame, inlined_frame_index, isolate));
45 } else if (frame_->is_wasm_interpreter_entry()) {
46 wasm_interpreted_frame_ =
47 WasmInterpreterEntryFrame::cast(frame_)
48 ->debug_info()
49 ->GetInterpretedFrame(frame_->fp(), inlined_frame_index);
50 DCHECK(wasm_interpreted_frame_);
51 }
52 }
53
~FrameInspector()54 FrameInspector::~FrameInspector() {
55 // Destructor needs to be defined in the .cc file, because it instantiates
56 // std::unique_ptr destructors but the types are not known in the header.
57 }
58
GetParametersCount()59 int FrameInspector::GetParametersCount() {
60 if (is_optimized_) return deoptimized_frame_->parameters_count();
61 if (wasm_interpreted_frame_)
62 return wasm_interpreted_frame_->GetParameterCount();
63 return frame_->ComputeParametersCount();
64 }
65
GetParameter(int index)66 Handle<Object> FrameInspector::GetParameter(int index) {
67 if (is_optimized_) return deoptimized_frame_->GetParameter(index);
68 // TODO(clemensh): Handle wasm_interpreted_frame_.
69 return handle(frame_->GetParameter(index), isolate_);
70 }
71
GetExpression(int index)72 Handle<Object> FrameInspector::GetExpression(int index) {
73 return is_optimized_ ? deoptimized_frame_->GetExpression(index)
74 : handle(frame_->GetExpression(index), isolate_);
75 }
76
GetContext()77 Handle<Object> FrameInspector::GetContext() {
78 return deoptimized_frame_ ? deoptimized_frame_->GetContext()
79 : handle(frame_->context(), isolate_);
80 }
81
IsWasm()82 bool FrameInspector::IsWasm() { return frame_->is_wasm(); }
83
IsJavaScript()84 bool FrameInspector::IsJavaScript() { return frame_->is_java_script(); }
85
ParameterIsShadowedByContextLocal(Handle<ScopeInfo> info,Handle<String> parameter_name)86 bool FrameInspector::ParameterIsShadowedByContextLocal(
87 Handle<ScopeInfo> info, Handle<String> parameter_name) {
88 VariableMode mode;
89 InitializationFlag init_flag;
90 MaybeAssignedFlag maybe_assigned_flag;
91 return ScopeInfo::ContextSlotIndex(info, parameter_name, &mode, &init_flag,
92 &maybe_assigned_flag) != -1;
93 }
94 } // namespace internal
95 } // namespace v8
96