[Interpreter] Save bytecode offset in interpreter stack frames.

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 42 matching lines @@
 
   // Accumulator.
   Node* GetAccumulator();
   void SetAccumulator(Node* value);
 
   // Context.
   Node* GetContext();
   void SetContext(Node* value);
 
   // Loads from and stores to the interpreter register file.
+  Node* LoadRegister(int offset);
   Node* LoadRegister(interpreter::Register reg);
   Node* LoadRegister(Node* reg_index);
+  Node* StoreRegister(Node* value, int offset);
+  Node* StoreRegister(Node* value, interpreter::Register reg);
   Node* StoreRegister(Node* value, Node* reg_index);
 
   // Returns the location in memory of the register |reg_index| in the
   // interpreter register file.
   Node* RegisterLocation(Node* reg_index);
 
   // Constants.
   Node* Int32Constant(int value);
   Node* IntPtrConstant(intptr_t value);
   Node* NumberConstant(double value);
@@ skipping 33 matching lines @@
   // |constructor| for the new keyword, but differs for the super
   // keyword.
   Node* CallConstruct(Node* new_target, Node* constructor, Node* first_arg,
                       Node* arg_count);
 
   // Call JSFunction or Callable |function| with |arg_count|
   // arguments (not including receiver) and the first argument
   // located at |first_arg|.
   Node* CallJS(Node* function, Node* first_arg, Node* arg_count);
 
+  // Specifies whether the current accumulator will be clobbered or saved
+  // across a call.
+  enum class SaveAccumulatorMode { kClobberAccumulator, kSaveAccumulator };
+
   // Call an IC code stub.
   Node* CallIC(CallInterfaceDescriptor descriptor, Node* target, Node* arg1,
-               Node* arg2, Node* arg3);
+               Node* arg2, Node* arg3,
+               SaveAccumulatorMode save_accum =
+                   SaveAccumulatorMode::kClobberAccumulator);
   Node* CallIC(CallInterfaceDescriptor descriptor, Node* target, Node* arg1,
-               Node* arg2, Node* arg3, Node* arg4);
+               Node* arg2, Node* arg3, Node* arg4,
+               SaveAccumulatorMode save_accum =
+                   SaveAccumulatorMode::kClobberAccumulator);
   Node* CallIC(CallInterfaceDescriptor descriptor, Node* target, Node* arg1,
-               Node* arg2, Node* arg3, Node* arg4, Node* arg5);
+               Node* arg2, Node* arg3, Node* arg4, Node* arg5,
+               SaveAccumulatorMode save_accum =
+                   SaveAccumulatorMode::kClobberAccumulator);
 
   // Call runtime function.
-  Node* CallRuntime(Node* function_id, Node* first_arg, Node* arg_count);
-  Node* CallRuntime(Runtime::FunctionId function_id, Node* arg1);
-  Node* CallRuntime(Runtime::FunctionId function_id, Node* arg1, Node* arg2);
+  Node* CallRuntime(Node* function_id, Node* first_arg, Node* arg_count,
+                    SaveAccumulatorMode save_accum =
+                        SaveAccumulatorMode::kClobberAccumulator);
+  Node* CallRuntime(Runtime::FunctionId function_id, Node* arg1,
+                    SaveAccumulatorMode save_accum =
+                        SaveAccumulatorMode::kClobberAccumulator);
   Node* CallRuntime(Runtime::FunctionId function_id, Node* arg1, Node* arg2,
-                    Node* arg3, Node* arg4);
+                    SaveAccumulatorMode save_accum =
+                        SaveAccumulatorMode::kClobberAccumulator);
+  Node* CallRuntime(Runtime::FunctionId function_id, Node* arg1, Node* arg2,
+                    Node* arg3, Node* arg4,
+                    SaveAccumulatorMode save_accum =
+                        SaveAccumulatorMode::kClobberAccumulator);
 
   // 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.
   void Return();
@@ skipping 14 matching lines @@
  private:
   // Returns a raw pointer to start of the register file on the stack.
   Node* RegisterFileRawPointer();
   // 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 parameter registers when performing a call
+  // to avoid Turbofan explicitly spilling them to the stack. The accumulator
+  // can be saved and restored if save_accumulator_mode is kSaveAccumulator,
+  // otherwise it will be clobbered by the call.
+  void CallPrologue(SaveAccumulatorMode save_accumulator_mode);
+  void CallEpilogue(SaveAccumulatorMode save_accumulator_mode);
+
   // 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* CallN(CallDescriptor* descriptor, Node* code_target, Node** args);
-  Node* CallIC(CallInterfaceDescriptor descriptor, Node* target, Node** args);
-  Node* CallJSBuiltin(int context_index, Node* receiver, Node** js_args,
-                      int js_arg_count);
+  Node* CallN(CallDescriptor* descriptor, Node* code_target, Node** args,
+              SaveAccumulatorMode save_accum);
+  Node* CallIC(CallInterfaceDescriptor descriptor, Node* target, Node** args,
+               SaveAccumulatorMode save_accum);
 
   // Returns BytecodeOffset() advanced by delta bytecodes. Note: this does not
   // update BytecodeOffset() itself.
   Node* Advance(int delta);
   Node* Advance(Node* delta);
 
   // Starts next instruction dispatch at |new_bytecode_offset|.
   void DispatchTo(Node* new_bytecode_offset);
 
   // Abort operations for debug code.
   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_;
   Node* context_;
+
   bool code_generated_;
 
   DISALLOW_COPY_AND_ASSIGN(InterpreterAssembler);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INTERPRETER_ASSEMBLER_H_