Assembler changes for enabling GrowHeap in Wasm

src/x64/macro-assembler-x64.cc

 // 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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 1096 matching lines @@
     xorl(dst, dst);
   } else if (is_uint32(x)) {
     movl(dst, Immediate(static_cast<uint32_t>(x)));
   } else if (is_int32(x)) {
     movq(dst, Immediate(static_cast<int32_t>(x)));
   } else {
     movq(dst, x);
   }
 }
 
+void MacroAssembler::Set(Register dst, int64_t x, RelocInfo::Mode rmode) {
+  if (x == 0) {
+    xorl(dst, dst);

[Yang, 2016/03/03 06:21:56]

so if x == 0, we ignore the relocation mode?

[titzer, 2016/03/03 18:11:59]

I think we shouldn't do any smartness here, since the relocation mode indicates
we might patch the value to be an arbitrary value later.

+  } else if (is_uint32(x)) {
+    movl(dst, Immediate(static_cast<uint32_t>(x), rmode));
+  } else if (is_int32(x)) {
+    movq(dst, Immediate(static_cast<int32_t>(x), rmode));
+  } else {
+    movq(dst, x, rmode);
+  }
+}
 
 void MacroAssembler::Set(const Operand& dst, intptr_t x) {
   if (kPointerSize == kInt64Size) {
     if (is_int32(x)) {
       movp(dst, Immediate(static_cast<int32_t>(x)));
     } else {
       Set(kScratchRegister, x);
       movp(dst, kScratchRegister);
     }
   } else {
@@ skipping 4452 matching lines @@
   movl(rax, dividend);
   shrl(rax, Immediate(31));
   addl(rdx, rax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64