Make snapshots reproducible.

src/ia32/assembler-ia32-inl.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 231 matching lines @@
 }
 
 
 Object** RelocInfo::call_object_address() {
   ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
          (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
   return reinterpret_cast<Object**>(pc_ + 1);
 }
 
 
+void RelocInfo::WipeOut() {
+  if (IsEmbeddedObject(rmode_) || IsExternalReference(rmode_)) {
+    Memory::Address_at(pc_) = NULL;
+  } else if (IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_)) {
+    Assembler::set_target_address_at(pc_, pc_ + sizeof(int32_t));

[Erik Corry, 2013/11/04 12:41:14]

Why add sizeof(int32_t) here?

[Sven Panne, 2013/11/04 13:03:19]

Because our Intel assemblers subtract this, but it is not strictly necessary,
any constant offset would do. I just wanted to effectively write zero at the
relocation.

+  } else {
+    UNREACHABLE();
+  }
+}
+
+
 bool RelocInfo::IsPatchedReturnSequence() {
   return *pc_ == kCallOpcode;
 }
 
 
 bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
   return !Assembler::IsNop(pc());
 }
 
 
@@ skipping 262 matching lines @@
 
 Operand::Operand(int32_t disp, RelocInfo::Mode rmode) {
   // [disp/r]
   set_modrm(0, ebp);
   set_dispr(disp, rmode);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_ASSEMBLER_IA32_INL_H_