[interpreter, debugger] support debug breaks via bytecode array copy

src/debug/debug-frames.cc

 // 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/frames-inl.h"
 
 namespace v8 {
 namespace internal {
 
 FrameInspector::FrameInspector(JavaScriptFrame* frame,
                                int inlined_jsframe_index, Isolate* isolate)
     : frame_(frame), deoptimized_frame_(NULL), isolate_(isolate) {
   has_adapted_arguments_ = frame_->has_adapted_arguments();
   is_bottommost_ = inlined_jsframe_index == 0;
   is_optimized_ = frame_->is_optimized();
+  is_interpreted_ = frame_->is_interpreted();
   // Calculate the deoptimized frame.
   if (frame->is_optimized()) {
     // TODO(turbofan): Revisit once we support deoptimization.
     if (frame->LookupCode()->is_turbofanned() &&
         frame->function()->shared()->asm_function() &&
         !FLAG_turbo_asm_deoptimization) {
       is_optimized_ = false;
       return;
     }
 
@@ skipping 34 matching lines @@
     return isolate_->factory()->undefined_value();
   }
   return is_optimized_ ? deoptimized_frame_->GetExpression(index)
                        : handle(frame_->GetExpression(index), isolate_);
 }
 
 
 int FrameInspector::GetSourcePosition() {
   if (is_optimized_) {
     return deoptimized_frame_->GetSourcePosition();
+  } else if (is_interpreted_) {
+    InterpretedFrame* frame = reinterpret_cast<InterpretedFrame*>(frame_);
+    // TODO(yangguo): Get the bytecode array from the frame.
+    BytecodeArray* bytecode_array =
+        frame->function()->shared()->bytecode_array();
+    return bytecode_array->SourcePosition(frame->GetBytecodeOffset());
   } else {
     Code* code = frame_->LookupCode();
     int offset = static_cast<int>(frame_->pc() - code->instruction_start());
     return code->SourcePosition(offset);
   }
 }
 
 
 bool FrameInspector::IsConstructor() {
   return is_optimized_ && !is_bottommost_
              ? deoptimized_frame_->HasConstructStub()
              : frame_->IsConstructor();
 }
 
 Handle<Object> FrameInspector::GetContext() {
   return is_optimized_ ? deoptimized_frame_->GetContext()
                        : handle(frame_->context(), isolate_);
 }
 
 
 // To inspect all the provided arguments the frame might need to be
 // replaced with the arguments frame.
 void FrameInspector::SetArgumentsFrame(JavaScriptFrame* frame) {
   DCHECK(has_adapted_arguments_);
   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) {
   HandleScope scope(isolate_);
   // First fill all parameters.
@@ skipping 100 matching lines @@
       if (!frames[i].function()->shared()->IsSubjectToDebugging()) continue;
       if (++count == index) return i;
     }
   }
   return -1;
 }
 
 
 }  // namespace internal
 }  // namespace v8