MIPS: Add code again to allow reclaiming old unexecuted functions.

src/mips/assembler-mips-inl.h

Index: src/mips/assembler-mips-inl.h
diff --git a/src/mips/assembler-mips-inl.h b/src/mips/assembler-mips-inl.h
index 123e2928283e12700d4126f89422acbe3ac6f1b0..caf544f7c8b5366d590ab6797dfcf680fd8c4cea 100644
--- a/src/mips/assembler-mips-inl.h
+++ b/src/mips/assembler-mips-inl.h
@@ -1,3 +1,4 @@
+
 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
@@ -231,6 +232,24 @@ void RelocInfo::set_target_cell(JSGlobalPropertyCell* cell,
 }
 
 
+static const int kNoCodeAgeSequenceLength = 7;
+
+Code* RelocInfo::code_age_stub() {
+  ASSERT(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
+  return Code::GetCodeFromTargetAddress(
+      Memory::Address_at(pc_ + Assembler::kInstrSize *
+                         (kNoCodeAgeSequenceLength - 1)));
+}
+
+
+void RelocInfo::set_code_age_stub(Code* stub) {
+  ASSERT(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
+  Memory::Address_at(pc_ + Assembler::kInstrSize *
+                     (kNoCodeAgeSequenceLength - 1)) =
+      stub->instruction_start();
+}
+
+
 Address RelocInfo::call_address() {
   ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
          (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
@@ -292,17 +311,6 @@ bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
 }
 
 
-Code* RelocInfo::code_age_stub() {
-  UNIMPLEMENTED();
-  return NULL;
-}
-
-
-void RelocInfo::set_code_age_stub(Code* stub) {
-  UNIMPLEMENTED();
-}
-
-
 void RelocInfo::Visit(ObjectVisitor* visitor) {
   RelocInfo::Mode mode = rmode();
   if (mode == RelocInfo::EMBEDDED_OBJECT) {
@@ -313,6 +321,8 @@ void RelocInfo::Visit(ObjectVisitor* visitor) {
     visitor->VisitGlobalPropertyCell(this);
   } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
     visitor->VisitExternalReference(this);
+  } else if (RelocInfo::IsCodeAgeSequence(mode)) {
+    visitor->VisitCodeAgeSequence(this);
 #ifdef ENABLE_DEBUGGER_SUPPORT
   // TODO(isolates): Get a cached isolate below.
   } else if (((RelocInfo::IsJSReturn(mode) &&
@@ -339,6 +349,8 @@ void RelocInfo::Visit(Heap* heap) {
     StaticVisitor::VisitGlobalPropertyCell(heap, this);
   } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
     StaticVisitor::VisitExternalReference(this);
+  } else if (RelocInfo::IsCodeAgeSequence(mode)) {
+    StaticVisitor::VisitCodeAgeSequence(heap, this);
 #ifdef ENABLE_DEBUGGER_SUPPORT
   } else if (heap->isolate()->debug()->has_break_points() &&
              ((RelocInfo::IsJSReturn(mode) &&