Add cmpxchg and lock instructions to x64 and ia32 {dis,}assemblers

src/x64/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.
 
 #include "src/x64/assembler-x64.h"
 
 #include <cstring>
 
 #if V8_TARGET_ARCH_X64
 
@@ skipping 998 matching lines @@
 }
 
 
 void Assembler::cmpb_al(Immediate imm8) {
   DCHECK(is_int8(imm8.value_) || is_uint8(imm8.value_));
   EnsureSpace ensure_space(this);
   emit(0x3c);
   emit(imm8.value_);
 }
 
+void Assembler::lock() {
+  EnsureSpace ensure_space(this);
+  emit(0xf0);
+}
+
+void Assembler::cmpxchgb(const Operand& dst, Register src) {
+  EnsureSpace ensure_space(this);
+  if (!src.is_byte_register()) {
+    // Register is not one of al, bl, cl, dl.  Its encoding needs REX.
+    emit_rex_32(src, dst);
+  } else {
+    emit_optional_rex_32(src, dst);
+  }
+  emit(0x0f);
+  emit(0xb0);
+  emit_operand(src, dst);
+}
+
+void Assembler::cmpxchgw(const Operand& dst, Register src) {
+  EnsureSpace ensure_space(this);
+  emit(0x66);
+  emit_optional_rex_32(src, dst);
+  emit(0x0f);
+  emit(0xb1);
+  emit_operand(src, dst);
+}
+
+void Assembler::emit_cmpxchg(const Operand& dst, Register src, int size) {
+  EnsureSpace ensure_space(this);
+  emit_rex(src, dst, size);
+  emit(0x0f);
+  emit(0xb1);
+  emit_operand(src, dst);
+}
 
 void Assembler::cpuid() {
   EnsureSpace ensure_space(this);
   emit(0x0F);
   emit(0xA2);
 }
 
 
 void Assembler::cqo() {
   EnsureSpace ensure_space(this);
@@ skipping 3229 matching lines @@
 
 bool RelocInfo::IsInConstantPool() {
   return false;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64