[Interpreter] Add option to trace bytecode execution.

src/compiler/interpreter-assembler.h

 // 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.
 
 #ifndef V8_COMPILER_INTERPRETER_ASSEMBLER_H_
 #define V8_COMPILER_INTERPRETER_ASSEMBLER_H_
 
 // Clients of this interface shouldn't depend on lots of compiler internals.
 // Do not include anything from src/compiler here!
 #include "src/allocation.h"
@@ skipping 120 matching lines @@
                Node* arg2, Node* arg3, Node* arg4);
   Node* CallIC(CallInterfaceDescriptor descriptor, Node* target, Node* arg1,
                Node* arg2, Node* arg3, Node* arg4, Node* arg5);
 
   // Call runtime function.
   Node* CallRuntime(Node* function_id, Node* first_arg, Node* arg_count,
                     int return_size = 1);
   Node* CallRuntime(Runtime::FunctionId function_id, Node* arg1);
   Node* CallRuntime(Runtime::FunctionId function_id, Node* arg1, Node* arg2);
   Node* CallRuntime(Runtime::FunctionId function_id, Node* arg1, Node* arg2,
+                    Node* arg3);
+  Node* CallRuntime(Runtime::FunctionId function_id, Node* arg1, Node* arg2,
                     Node* arg3, Node* arg4);
 
   // Jump relative to the current bytecode by |jump_offset|.
   void Jump(Node* jump_offset);
 
   // Jump relative to the current bytecode by |jump_offset| if the
   // word values |lhs| and |rhs| are equal.
   void JumpIfWordEqual(Node* lhs, Node* rhs, Node* jump_offset);
 
   // Returns from the function.
@@ skipping 18 matching lines @@
   // Returns a tagged pointer to the current function's BytecodeArray object.
   Node* BytecodeArrayTaggedPointer();
   // Returns the offset from the BytecodeArrayPointer of the current bytecode.
   Node* BytecodeOffset();
   // Returns a raw pointer to first entry in the interpreter dispatch table.
   Node* DispatchTableRawPointer();
 
   // Saves and restores interpreter bytecode offset to the interpreter stack
   // frame when performing a call.
   void CallPrologue();
   void CallEpilogue();

[Michael Starzinger, 2016/01/28 12:32:26]

nit: Also the declaration of CallEpilogue can be dropped and the comment above
adapted now.

[rmcilroy, 2016/01/28 16:39:51]

Done.

 
+  // Traces the current bytecode by calling |function_id|.
+  void TraceBytecode(Runtime::FunctionId function_id);
+
   // Returns the offset of register |index| relative to RegisterFilePointer().
   Node* RegisterFrameOffset(Node* index);
 
   Node* SmiShiftBitsConstant();
   Node* BytecodeOperand(int operand_index);
   Node* BytecodeOperandSignExtended(int operand_index);
   Node* BytecodeOperandShort(int operand_index);
   Node* BytecodeOperandShortSignExtended(int operand_index);
 
   Node* CallN(CallDescriptor* descriptor, Node* code_target, Node** args);
@@ skipping 11 matching lines @@
   void AbortIfWordNotEqual(Node* lhs, Node* rhs, BailoutReason bailout_reason);
 
   // Private helpers which delegate to RawMachineAssembler.
   Isolate* isolate();
   Zone* zone();
 
   interpreter::Bytecode bytecode_;
   base::SmartPointer<RawMachineAssembler> raw_assembler_;
 
   Node* accumulator_;
   Node* bytecode_offset_;

[Michael Starzinger, 2016/01/28 15:36:21]

nit: Also, the {bytecode_offset} field can now be fully removed and we can
change InterpreterAssembler::BytecodeOffset to just always return the parameter
holding said value.

[rmcilroy, 2016/01/28 16:39:51]

Done.

   Node* context_;
 
   bool code_generated_;
 
   DISALLOW_COPY_AND_ASSIGN(InterpreterAssembler);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INTERPRETER_ASSEMBLER_H_