X87: [crankshaft] Support ES6 tail call elimination.

src/x87/macro-assembler-x87.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_X87_MACRO_ASSEMBLER_X87_H_
 #define V8_X87_MACRO_ASSEMBLER_X87_H_
 
 #include "src/assembler.h"
 #include "src/bailout-reason.h"
 #include "src/frames.h"
@@ skipping 26 matching lines @@
 
 enum RememberedSetAction { EMIT_REMEMBERED_SET, OMIT_REMEMBERED_SET };
 enum SmiCheck { INLINE_SMI_CHECK, OMIT_SMI_CHECK };
 enum PointersToHereCheck {
   kPointersToHereMaybeInteresting,
   kPointersToHereAreAlwaysInteresting
 };
 
 enum RegisterValueType { REGISTER_VALUE_IS_SMI, REGISTER_VALUE_IS_INT32 };
 
+enum class ReturnAddressState { kOnStack, kNotOnStack };
+
 #ifdef DEBUG
 bool AreAliased(Register reg1, Register reg2, Register reg3 = no_reg,
                 Register reg4 = no_reg, Register reg5 = no_reg,
                 Register reg6 = no_reg, Register reg7 = no_reg,
                 Register reg8 = no_reg);
 #endif
 
 // MacroAssembler implements a collection of frequently used macros.
 class MacroAssembler: public Assembler {
  public:
@@ skipping 254 matching lines @@
     }
   }
 
   void CmpWeakValue(Register value, Handle<WeakCell> cell, Register scratch);
   void GetWeakValue(Register value, Handle<WeakCell> cell);
   void LoadWeakValue(Register value, Handle<WeakCell> cell, Label* miss);
 
   // ---------------------------------------------------------------------------
   // JavaScript invokes
 
+  // Removes current frame and its arguments from the stack preserving
+  // the arguments and a return address pushed to the stack for the next call.
+  // |ra_state| defines whether return address is already pushed to stack or
+  // not. Both |callee_args_count| and |caller_args_count_reg| do not include
+  // receiver. |callee_args_count| is not modified, |caller_args_count_reg|
+  // is trashed.
+  void PrepareForTailCall(const ParameterCount& callee_args_count,
+                          Register caller_args_count_reg, Register scratch0,
+                          Register scratch1, ReturnAddressState ra_state);
+
   // Invoke the JavaScript function code by either calling or jumping.
 
   void InvokeFunctionCode(Register function, Register new_target,
                           const ParameterCount& expected,
                           const ParameterCount& actual, InvokeFlag flag,
                           const CallWrapper& call_wrapper);
 
   void FloodFunctionIfStepping(Register fun, Register new_target,
                                const ParameterCount& expected,
                                const ParameterCount& actual);
@@ skipping 419 matching lines @@
 
   void Lzcnt(Register dst, Register src) { Lzcnt(dst, Operand(src)); }
   void Lzcnt(Register dst, const Operand& src);
 
   void Tzcnt(Register dst, Register src) { Tzcnt(dst, Operand(src)); }
   void Tzcnt(Register dst, const Operand& src);
 
   void Popcnt(Register dst, Register src) { Popcnt(dst, Operand(src)); }
   void Popcnt(Register dst, const Operand& src);
 
-  // Emit call to the code we are currently generating.
-  void CallSelf() {
-    Handle<Code> self(reinterpret_cast<Code**>(CodeObject().location()));
-    call(self, RelocInfo::CODE_TARGET);
-  }
-
   // Move if the registers are not identical.
   void Move(Register target, Register source);
 
   // Move a constant into a destination using the most efficient encoding.
   void Move(Register dst, const Immediate& x);
   void Move(const Operand& dst, const Immediate& x);
 
   void Move(Register dst, Handle<Object> handle) { LoadObject(dst, handle); }
   void Move(Register dst, Smi* source) { Move(dst, Immediate(source)); }
 
@@ skipping 230 matching lines @@
   }                                                                       \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_X87_MACRO_ASSEMBLER_X87_H_