Ensure that Code objects' kind specific flags are initialized properly.

Also, have the stub cache set a valid MajorKey on stubs it creates.
Getting weird random bits frightens and confuses the poor simple type feedback oracle.

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/108443004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18309 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/code-stubs.cc

@@ -197,6 +197,7 @@ const char* CodeStub::MajorName(CodeStub::Major major_key,
 #define DEF_CASE(name) case name: return #name "Stub";
     CODE_STUB_LIST(DEF_CASE)
 #undef DEF_CASE
+    case UninitializedMajorKey: return "<UninitializedMajorKey>Stub";
     default:
       if (!allow_unknown_keys) {
         UNREACHABLE();

src/code-stubs.h

@@ -130,6 +130,7 @@ namespace internal {
 class CodeStub BASE_EMBEDDED {
  public:
   enum Major {
+    UninitializedMajorKey = 0,
 #define DEF_ENUM(name) name,
     CODE_STUB_LIST(DEF_ENUM)
 #undef DEF_ENUM

src/heap.cc

@@ -4228,6 +4228,8 @@ MaybeObject* Heap::CreateCode(const CodeDesc& desc,
   code->set_instruction_size(desc.instr_size);
   code->set_relocation_info(reloc_info);
   code->set_flags(flags);
+  code->set_raw_kind_specific_flags1(0);
+  code->set_raw_kind_specific_flags2(0);
   if (code->is_call_stub() || code->is_keyed_call_stub()) {
     code->set_check_type(RECEIVER_MAP_CHECK);
   }

src/objects-inl.h

@@ -3915,6 +3915,17 @@ int Code::arguments_count() {
 }
 
 
+// For initialization.
+void Code::set_raw_kind_specific_flags1(int value) {
+  WRITE_INT_FIELD(this, kKindSpecificFlags1Offset, value);
+}
+
+
+void Code::set_raw_kind_specific_flags2(int value) {
+  WRITE_INT_FIELD(this, kKindSpecificFlags2Offset, value);
+}
+
+
 inline bool Code::is_crankshafted() {
   return IsCrankshaftedField::decode(
       READ_UINT32_FIELD(this, kKindSpecificFlags2Offset));

src/objects.h

@@ -5150,6 +5150,9 @@ class Code: public HeapObject {
   inline bool is_to_boolean_ic_stub() { return kind() == TO_BOOLEAN_IC; }
   inline bool is_keyed_stub();
 
+  inline void set_raw_kind_specific_flags1(int value);
+  inline void set_raw_kind_specific_flags2(int value);
+
   // [major_key]: For kind STUB or BINARY_OP_IC, the major key.
   inline int major_key();
   inline void set_major_key(int value);

src/stub-cache.cc

@@ -1100,6 +1100,9 @@ Handle<Code> StubCompiler::GetCodeWithFlags(Code::Flags flags,
   CodeDesc desc;
   masm_.GetCode(&desc);
   Handle<Code> code = factory()->NewCode(desc, flags, masm_.CodeObject());
+  if (code->has_major_key()) {
+    code->set_major_key(CodeStub::NoCache);
+  }
 #ifdef ENABLE_DISASSEMBLER
   if (FLAG_print_code_stubs) code->Disassemble(name);
 #endif