[es6] [interpreter] Add tail calls support to Ignition.

src/interpreter/interpreter.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/interpreter/interpreter.h"
 
 #include "src/ast/prettyprinter.h"
 #include "src/code-factory.h"
 #include "src/compiler.h"
 #include "src/factory.h"
@@ skipping 904 matching lines @@
 
 
 // DeletePropertySloppy
 //
 // Delete the property specified in the accumulator from the object
 // referenced by the register operand following sloppy mode semantics.
 void Interpreter::DoDeletePropertySloppy(InterpreterAssembler* assembler) {
   DoDelete(Runtime::kDeleteProperty_Sloppy, assembler);
 }
 
-
-void Interpreter::DoJSCall(InterpreterAssembler* assembler) {
+void Interpreter::DoJSCall(InterpreterAssembler* assembler,
+                           TailCallMode tail_call_mode) {
   Node* function_reg = __ BytecodeOperandReg(0);
   Node* function = __ LoadRegister(function_reg);
   Node* receiver_reg = __ BytecodeOperandReg(1);
   Node* receiver_arg = __ RegisterLocation(receiver_reg);
   Node* receiver_args_count = __ BytecodeOperandCount(2);
   Node* receiver_count = __ Int32Constant(1);
   Node* args_count = __ Int32Sub(receiver_args_count, receiver_count);
   Node* context = __ GetContext();
   // TODO(rmcilroy): Use the call type feedback slot to call via CallStub.
-  Node* result = __ CallJS(function, context, receiver_arg, args_count);
+  Node* result =
+      __ CallJS(function, context, receiver_arg, args_count, tail_call_mode);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
 
 // Call <callable> <receiver> <arg_count>
 //
 // Call a JSfunction or Callable in |callable| with the |receiver| and
 // |arg_count| arguments in subsequent registers.
 void Interpreter::DoCall(InterpreterAssembler* assembler) {
-  DoJSCall(assembler);
+  DoJSCall(assembler, TailCallMode::kDisallow);
 }
 
 
 // CallWide <callable> <receiver> <arg_count>
 //
 // Call a JSfunction or Callable in |callable| with the |receiver| and
 // |arg_count| arguments in subsequent registers.
 void Interpreter::DoCallWide(InterpreterAssembler* assembler) {
-  DoJSCall(assembler);
+  DoJSCall(assembler, TailCallMode::kDisallow);
+}
+
+// TailCall <callable> <receiver> <arg_count>
+//
+// Tail call a JSfunction or Callable in |callable| with the |receiver| and
+// |arg_count| arguments in subsequent registers.
+void Interpreter::DoTailCall(InterpreterAssembler* assembler) {
+  DoJSCall(assembler, TailCallMode::kAllow);
+}
+
+// TailCallWide <callable> <receiver> <arg_count>
+//
+// Tail call a JSfunction or Callable in |callable| with the |receiver| and
+// |arg_count| arguments in subsequent registers.
+void Interpreter::DoTailCallWide(InterpreterAssembler* assembler) {
+  DoJSCall(assembler, TailCallMode::kAllow);
 }
 
 void Interpreter::DoCallRuntimeCommon(InterpreterAssembler* assembler) {
   Node* function_id = __ BytecodeOperandIdx(0);
   Node* first_arg_reg = __ BytecodeOperandReg(1);
   Node* first_arg = __ RegisterLocation(first_arg_reg);
   Node* args_count = __ BytecodeOperandCount(2);
   Node* context = __ GetContext();
   Node* result = __ CallRuntimeN(function_id, context, first_arg, args_count);
   __ SetAccumulator(result);
@@ skipping 70 matching lines @@
   Node* receiver_count = __ Int32Constant(1);
   Node* args_count = __ Int32Sub(receiver_args_count, receiver_count);
 
   // Get the function to call from the native context.
   Node* context = __ GetContext();
   Node* native_context =
       __ LoadContextSlot(context, Context::NATIVE_CONTEXT_INDEX);
   Node* function = __ LoadContextSlot(native_context, context_index);
 
   // Call the function.
-  Node* result = __ CallJS(function, context, first_arg, args_count);
+  Node* result = __ CallJS(function, context, first_arg, args_count,
+                           TailCallMode::kDisallow);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
 
 // CallJSRuntime <context_index> <receiver> <arg_count>
 //
 // Call the JS runtime function that has the |context_index| with the receiver
 // in register |receiver| and |arg_count| arguments in subsequent registers.
 void Interpreter::DoCallJSRuntime(InterpreterAssembler* assembler) {
@@ skipping 735 matching lines @@
   Node* index = __ LoadRegister(index_reg);
   Node* context = __ GetContext();
   Node* result = __ CallRuntime(Runtime::kForInStep, context, index);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8