Enable preaging of code objects when --optimize-for-size.

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 29 matching lines @@
 #include "ia32/assembler-ia32.h"
 
 #include "cpu.h"
 #include "debug.h"
 
 namespace v8 {
 namespace internal {
 
 
 static const byte kCallOpcode = 0xE8;
+static const int kNoCodeAgeSequenceLength = 5;
 
 
 // The modes possibly affected by apply must be in kApplyMask.
 void RelocInfo::apply(intptr_t delta) {
   if (IsRuntimeEntry(rmode_) || IsCodeTarget(rmode_)) {
     int32_t* p = reinterpret_cast<int32_t*>(pc_);
     *p -= delta;  // Relocate entry.
     CPU::FlushICache(p, sizeof(uint32_t));
   } else if (rmode_ == CODE_AGE_SEQUENCE) {
     if (*pc_ == kCallOpcode) {
@@ skipping 123 matching lines @@
   CPU::FlushICache(pc_, sizeof(Address));
   if (mode == UPDATE_WRITE_BARRIER && host() != NULL) {
     // TODO(1550) We are passing NULL as a slot because cell can never be on
     // evacuation candidate.
     host()->GetHeap()->incremental_marking()->RecordWrite(
         host(), NULL, cell);
   }
 }
 
 
+Handle<Object> RelocInfo::code_age_stub_handle(Assembler* origin) {
+  ASSERT(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
+  ASSERT(*pc_ == kCallOpcode);
+  return Memory::Object_Handle_at(pc_ + 1);
+}
+
+
 Code* RelocInfo::code_age_stub() {
   ASSERT(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
   ASSERT(*pc_ == kCallOpcode);
   return Code::GetCodeFromTargetAddress(
       Assembler::target_address_at(pc_ + 1));
 }
 
 
 void RelocInfo::set_code_age_stub(Code* stub) {
   ASSERT(*pc_ == kCallOpcode);
@@ skipping 169 matching lines @@
   } else {
     // no relocation needed
     emit(reinterpret_cast<intptr_t>(obj));
   }
 }
 
 
 void Assembler::emit(uint32_t x, RelocInfo::Mode rmode, TypeFeedbackId id) {
   if (rmode == RelocInfo::CODE_TARGET && !id.IsNone()) {
     RecordRelocInfo(RelocInfo::CODE_TARGET_WITH_ID, id.ToInt());
-  } else if (!RelocInfo::IsNone(rmode)) {
+  } else if (!RelocInfo::IsNone(rmode)
+      && rmode != RelocInfo::CODE_AGE_SEQUENCE) {
     RecordRelocInfo(rmode);
   }
   emit(x);
 }
 
 
 void Assembler::emit(Handle<Code> code,
                      RelocInfo::Mode rmode,
                      TypeFeedbackId id) {
   AllowDeferredHandleDereference embedding_raw_address;
@@ skipping 122 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_