[interpreter] Rename HandlerTable::depth field.

src/frames.h

 // Copyright 2012 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.
 
 #ifndef V8_FRAMES_H_
 #define V8_FRAMES_H_
 
 #include "src/allocation.h"
 #include "src/handles.h"
 #include "src/safepoint-table.h"
@@ skipping 606 matching lines @@
   // Determine the code for the frame.
   Code* unchecked_code() const override;
 
   // Return a list with JSFunctions of this frame.
   virtual void GetFunctions(List<JSFunction*>* functions) const;
 
   // Build a list with summaries for this frame including all inlined frames.
   virtual void Summarize(List<FrameSummary>* frames);
 
   // Lookup exception handler for current {pc}, returns -1 if none found. Also
-  // returns the expected number of stack slots at the handler site.
+  // returns data associated with the handler site specific to the frame type:
+  //  - JavaScriptFrame : Data is the stack depth at entry of the try-block.
+  //  - OptimizedFrame  : Data is the stack slot count of the entire frame.
+  //  - InterpretedFrame: Data is the register index holding the context.
   virtual int LookupExceptionHandlerInTable(
-      int* stack_slots, HandlerTable::CatchPrediction* prediction);
+      int* data, HandlerTable::CatchPrediction* prediction);
 
   // Architecture-specific register description.
   static Register fp_register();
   static Register context_register();
   static Register constant_pool_pointer_register();
 
   static JavaScriptFrame* cast(StackFrame* frame) {
     DCHECK(frame->is_java_script());
     return static_cast<JavaScriptFrame*>(frame);
   }
@@ skipping 51 matching lines @@
   // GC support.
   void Iterate(ObjectVisitor* v) const override;
 
   // Return a list with JSFunctions of this frame.
   // The functions are ordered bottom-to-top (i.e. functions.last()
   // is the top-most activation)
   void GetFunctions(List<JSFunction*>* functions) const override;
 
   void Summarize(List<FrameSummary>* frames) override;
 
-  // Lookup exception handler for current {pc}, returns -1 if none found. Also
-  // returns the expected number of stack slots at the handler site.
+  // Lookup exception handler for current {pc}, returns -1 if none found.
   int LookupExceptionHandlerInTable(
-      int* stack_slots, HandlerTable::CatchPrediction* prediction) override;
+      int* data, HandlerTable::CatchPrediction* prediction) override;
 
   DeoptimizationInputData* GetDeoptimizationData(int* deopt_index) const;
 
   static int StackSlotOffsetRelativeToFp(int slot_index);
 
  protected:
   inline explicit OptimizedFrame(StackFrameIteratorBase* iterator);
 
  private:
   friend class StackFrameIteratorBase;
 
   Object* StackSlotAt(int index) const;
 };
 
 
 class InterpretedFrame : public JavaScriptFrame {
  public:
   Type type() const override { return INTERPRETED; }
 
-  // Lookup exception handler for current {pc}, returns -1 if none found. Also
-  // returns the expected number of stack slots at the handler site.
+  // Lookup exception handler for current {pc}, returns -1 if none found.
   int LookupExceptionHandlerInTable(
-      int* stack_slots, HandlerTable::CatchPrediction* prediction) override;
+      int* data, HandlerTable::CatchPrediction* prediction) override;
 
   // Returns the current offset into the bytecode stream.
   int GetBytecodeOffset() const;
 
   // Updates the current offset into the bytecode stream, mainly used for stack
   // unwinding to continue execution at a different bytecode offset.
   void PatchBytecodeOffset(int new_offset);
 
   // Access to the interpreter register file for this frame.
   Object* GetInterpreterRegister(int register_index) const;
@@ skipping 253 matching lines @@
 
 
 // Reads all frames on the current stack and copies them into the current
 // zone memory.
 Vector<StackFrame*> CreateStackMap(Isolate* isolate, Zone* zone);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_FRAMES_H_