Get rid of CodeStub::TryGetCode.

This function is no longer needed.  It was only used (overly defensively)
when fetching the stack check stub for on-stack replacement patching.

R=vegorov@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/8510013

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9942 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/code-stubs-arm.h

@@ -585,13 +585,6 @@ class RecordWriteStub: public CodeStub {
         SaveFPRegsModeBits::encode(save_fp_regs_mode_);
   }
 
-  bool MustBeInStubCache() {
-    // All stubs must be registered in the stub cache
-    // otherwise IncrementalMarker would not be able to find
-    // and patch it.
-    return true;
-  }
-
   void Activate(Code* code) {
     code->GetHeap()->incremental_marking()->ActivateGeneratedStub(code);
   }

src/code-stubs.cc

@@ -139,47 +139,6 @@ Handle<Code> CodeStub::GetCode() {
 }
 
 
-MaybeObject* CodeStub::TryGetCode() {
-  Code* code;
-  if (!FindCodeInCache(&code)) {
-    // Generate the new code.
-    MacroAssembler masm(Isolate::Current(), NULL, 256);
-    GenerateCode(&masm);
-    Heap* heap = masm.isolate()->heap();
-
-    // Create the code object.
-    CodeDesc desc;
-    masm.GetCode(&desc);
-
-    // Try to copy the generated code into a heap object.
-    Code::Flags flags = Code::ComputeFlags(
-        static_cast<Code::Kind>(GetCodeKind()),
-        GetICState());
-    Object* new_object;
-    { MaybeObject* maybe_new_object =
-          heap->CreateCode(desc, flags, masm.CodeObject());
-      if (!maybe_new_object->ToObject(&new_object)) return maybe_new_object;
-    }
-    code = Code::cast(new_object);
-    RecordCodeGeneration(code, &masm);
-    FinishCode(code);
-
-    // Try to update the code cache but do not fail if unable.
-    MaybeObject* maybe_new_object =
-        heap->code_stubs()->AtNumberPut(GetKey(), code);
-    if (maybe_new_object->ToObject(&new_object)) {
-      heap->public_set_code_stubs(NumberDictionary::cast(new_object));
-    } else if (MustBeInStubCache()) {
-      return maybe_new_object;
-    }
-
-    Activate(code);
-  }
-
-  return code;
-}
-
-
 const char* CodeStub::MajorName(CodeStub::Major major_key,
                                 bool allow_unknown_keys) {
   switch (major_key) {

src/code-stubs.h

@@ -118,11 +118,6 @@ class CodeStub BASE_EMBEDDED {
   // Retrieve the code for the stub. Generate the code if needed.
   Handle<Code> GetCode();
 
-  // Retrieve the code for the stub if already generated.  Do not
-  // generate the code if not already generated and instead return a
-  // retry after GC Failure object.
-  MUST_USE_RESULT MaybeObject* TryGetCode();
-
   static Major MajorKeyFromKey(uint32_t key) {
     return static_cast<Major>(MajorKeyBits::decode(key));
   }
@@ -160,14 +155,14 @@ class CodeStub BASE_EMBEDDED {
   // result in a traversable stack.
   virtual bool SometimesSetsUpAFrame() { return true; }
 
+  // Lookup the code in the (possibly custom) cache.
+  bool FindCodeInCache(Code** code_out);
+
  protected:
   static const int kMajorBits = 6;
   static const int kMinorBits = kBitsPerInt - kSmiTagSize - kMajorBits;
 
  private:
-  // Lookup the code in the (possibly custom) cache.
-  bool FindCodeInCache(Code** code_out);
-
   // Nonvirtual wrapper around the stub-specific Generate function.  Call
   // this function to set up the macro assembler and generate the code.
   void GenerateCode(MacroAssembler* masm);
@@ -182,10 +177,6 @@ class CodeStub BASE_EMBEDDED {
   // Finish the code object after it has been generated.
   virtual void FinishCode(Code* code) { }
 
-  // Returns true if TryGetCode should fail if it failed
-  // to register newly generated stub in the stub cache.
-  virtual bool MustBeInStubCache() { return false; }
-
   // Activate newly generated stub. Is called after
   // registering stub in the stub cache.
   virtual void Activate(Code* code) { }

src/ia32/code-stubs-ia32.h

@@ -711,13 +711,6 @@ class RecordWriteStub: public CodeStub {
         SaveFPRegsModeBits::encode(save_fp_regs_mode_);
   }
 
-  bool MustBeInStubCache() {
-    // All stubs must be registered in the stub cache
-    // otherwise IncrementalMarker would not be able to find
-    // and patch it.
-    return true;
-  }
-
   void Activate(Code* code) {
     code->GetHeap()->incremental_marking()->ActivateGeneratedStub(code);
   }

src/mips/code-stubs-mips.h

@@ -586,13 +586,6 @@ class RecordWriteStub: public CodeStub {
         SaveFPRegsModeBits::encode(save_fp_regs_mode_);
   }
 
-  bool MustBeInStubCache() {
-    // All stubs must be registered in the stub cache
-    // otherwise IncrementalMarker would not be able to find
-    // and patch it.
-    return true;
-  }
-
   void Activate(Code* code) {
     code->GetHeap()->incremental_marking()->ActivateGeneratedStub(code);
   }

src/runtime-profiler.cc

@@ -136,14 +136,13 @@ void RuntimeProfiler::AttemptOnStackReplacement(JSFunction* function) {
   // Get the stack check stub code object to match against.  We aren't
   // prepared to generate it, but we don't expect to have to.
   StackCheckStub check_stub;
-  Object* check_code;
+  Code* stack_check_code = NULL;
-  MaybeObject* maybe_check_code = check_stub.TryGetCode();
+  if (check_stub.FindCodeInCache(&stack_check_code)) {
-  if (maybe_check_code->ToObject(&check_code)) {
     Code* replacement_code =
         isolate_->builtins()->builtin(Builtins::kOnStackReplacement);
     Code* unoptimized_code = shared->code();
     Deoptimizer::PatchStackCheckCode(unoptimized_code,
-                                     Code::cast(check_code),
+                                     stack_check_code,
                                      replacement_code);
   }
 }

src/x64/code-stubs-x64.h

@@ -693,13 +693,6 @@ class RecordWriteStub: public CodeStub {
         SaveFPRegsModeBits::encode(save_fp_regs_mode_);
   }
 
-  bool MustBeInStubCache() {
-    // All stubs must be registered in the stub cache
-    // otherwise IncrementalMarker would not be able to find
-    // and patch it.
-    return true;
-  }
-
   void Activate(Code* code) {
     code->GetHeap()->incremental_marking()->ActivateGeneratedStub(code);
   }