Fix potential overwriting of debug jumps of following code.

src/x64/assembler-x64.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 396 matching lines @@
   desc->instr_size = pc_offset();
   ASSERT(desc->instr_size > 0);  // Zero-size code objects upset the system.
   desc->reloc_size =
       static_cast<int>((buffer_ + buffer_size_) - reloc_info_writer.pos());
   desc->origin = this;
 
   Counters::reloc_info_size.Increment(desc->reloc_size);
 }
 
 
+void Assembler::Pad(int n) {

[Rico, 2011/02/02 11:35:37]

Not used

[Lasse Reichstein, 2011/02/03 14:14:12]

Removed.

+  ASSERT(n > 0);
+  while (n > 9) {
+    nop(9);
+    n -= 9;
+  }
+  nop(n);
+}
+
+
 void Assembler::Align(int m) {
   ASSERT(IsPowerOf2(m));
   int delta = (m - (pc_offset() & (m - 1))) & (m - 1);
   while (delta >= 9) {
     nop(9);
     delta -= 9;
   }
   if (delta > 0) {
     nop(delta);
   }
@@ skipping 482 matching lines @@
   positions_recorder()->WriteRecordedPositions();
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   // Opcode: FF /2 m64.
   emit_optional_rex_32(op);
   emit(0xFF);
   emit_operand(0x2, op);
 }
 
 
+void Assembler::call(Address target) {
+  positions_recorder()->WriteRecordedPositions();
+  EnsureSpace ensure_space(this);
+  last_pc_ = pc_;
+  // 1110 1000 #32-bit disp.
+  emit(0xE8);
+  Address source = pc_ + 4;
+  intptr_t displacement = target - source;
+  ASSERT(is_int32(displacement));
+  emitl(static_cast<int32_t>(displacement));
+}
+
+
 void Assembler::clc() {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   emit(0xF8);
 }
 
 void Assembler::cdq() {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   emit(0x99);
@@ skipping 2160 matching lines @@
   // specially coded on x64 means that it is a relative 32 bit address, as used
   // by branch instructions.
   return (1 << rmode_) & kApplyMask;
 }
 
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64