Simplify MacroAssembler::InvokePrologue a bit.

src/ppc/macro-assembler-ppc.cc

 // Copyright 2014 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 <assert.h>  // For assert
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/base/bits.h"
@@ skipping 983 matching lines @@
   Move(dst, d1);
 }
 
 
 void MacroAssembler::MovFromFloatParameter(const DoubleRegister dst) {
   Move(dst, d1);
 }
 
 
 void MacroAssembler::InvokePrologue(const ParameterCount& expected,
-                                    const ParameterCount& actual,
-                                    Handle<Code> code_constant,
-                                    Register code_reg, Label* done,
+                                    const ParameterCount& actual, Label* done,
                                     bool* definitely_mismatches,
                                     InvokeFlag flag,
                                     const CallWrapper& call_wrapper) {
   bool definitely_matches = false;
   *definitely_mismatches = false;
   Label regular_invoke;
 
   // Check whether the expected and actual arguments count match. If not,
   // setup registers according to contract with ArgumentsAdaptorTrampoline:
   //  r3: actual arguments count
   //  r4: function (passed through to callee)
   //  r5: expected arguments count
 
   // The code below is made a lot easier because the calling code already sets
   // up actual and expected registers according to the contract if values are
   // passed in registers.
 
   // ARM has some sanity checks as per below, considering add them for PPC
   //  DCHECK(actual.is_immediate() || actual.reg().is(r3));
   //  DCHECK(expected.is_immediate() || expected.reg().is(r5));
-  //  DCHECK((!code_constant.is_null() && code_reg.is(no_reg))
-  //          || code_reg.is(r6));
 
   if (expected.is_immediate()) {
     DCHECK(actual.is_immediate());
     mov(r3, Operand(actual.immediate()));
     if (expected.immediate() == actual.immediate()) {
       definitely_matches = true;
     } else {
       const int sentinel = SharedFunctionInfo::kDontAdaptArgumentsSentinel;
       if (expected.immediate() == sentinel) {
         // Don't worry about adapting arguments for builtins that
@@ skipping 11 matching lines @@
       mov(r3, Operand(actual.immediate()));
       cmpi(expected.reg(), Operand(actual.immediate()));
       beq(&regular_invoke);
     } else {
       cmp(expected.reg(), actual.reg());
       beq(&regular_invoke);
     }
   }
 
   if (!definitely_matches) {
-    if (!code_constant.is_null()) {
-      mov(r6, Operand(code_constant));
-      addi(r6, r6, Operand(Code::kHeaderSize - kHeapObjectTag));
-    }
-
     Handle<Code> adaptor = isolate()->builtins()->ArgumentsAdaptorTrampoline();
     if (flag == CALL_FUNCTION) {
       call_wrapper.BeforeCall(CallSize(adaptor));
       Call(adaptor);
       call_wrapper.AfterCall();
       if (!*definitely_mismatches) {
         b(done);
       }
     } else {
       Jump(adaptor, RelocInfo::CODE_TARGET);
     }
     bind(&regular_invoke);
   }
 }
 
 
 void MacroAssembler::InvokeCode(Register code, const ParameterCount& expected,
                                 const ParameterCount& actual, InvokeFlag flag,
                                 const CallWrapper& call_wrapper) {
   // You can't call a function without a valid frame.
   DCHECK(flag == JUMP_FUNCTION || has_frame());
 
   Label done;
   bool definitely_mismatches = false;
-  InvokePrologue(expected, actual, Handle<Code>::null(), code, &done,
-                 &definitely_mismatches, flag, call_wrapper);
+  InvokePrologue(expected, actual, &done, &definitely_mismatches, flag,
+                 call_wrapper);
   if (!definitely_mismatches) {
     if (flag == CALL_FUNCTION) {
       call_wrapper.BeforeCall(CallSize(code));
       CallJSEntry(code);
       call_wrapper.AfterCall();
     } else {
       DCHECK(flag == JUMP_FUNCTION);
       JumpToJSEntry(code);
     }
 
@@ skipping 3320 matching lines @@
   }
   if (mag.shift > 0) srawi(result, result, mag.shift);
   ExtractBit(r0, dividend, 31);
   add(result, result, r0);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC