Massage the CodeStub class hierarchy a bit.

Several tiny changes for the upcoming TurboFan-genrated handlers/stubs:

   * Relaxed the type of code_stub().

   * Made GetCodeKind() public, it effectly was like this, anyway.

   * Const-corrected GetStubType().

Review URL: https://codereview.chromium.org/915583002

Cr-Commit-Position: refs/heads/master@{#26542}

src/code-stubs-hydrogen.cc

@@ -58,7 +58,7 @@ class CodeStubGraphBuilderBase : public HGraphBuilder {
     return arguments_length_;
   }
   CompilationInfo* info() { return info_; }
-  HydrogenCodeStub* stub() { return info_->code_stub(); }
+  CodeStub* stub() { return info_->code_stub(); }
   HContext* context() { return context_; }
   Isolate* isolate() { return info_->isolate(); }
 

src/code-stubs.h

@@ -213,11 +213,12 @@ class CodeStub BASE_EMBEDDED {
   virtual Major MajorKey() const = 0;
   uint32_t MinorKey() const { return minor_key_; }
 
+  // BinaryOpStub needs to override this.
+  virtual Code::Kind GetCodeKind() const;
+
   virtual InlineCacheState GetICState() const { return UNINITIALIZED; }
   virtual ExtraICState GetExtraICState() const { return kNoExtraICState; }
-  virtual Code::StubType GetStubType() {
-    return Code::NORMAL;
-  }
+  virtual Code::StubType GetStubType() const { return Code::NORMAL; }
 
   friend std::ostream& operator<<(std::ostream& os, const CodeStub& s) {
     s.PrintName(os);
@@ -261,9 +262,6 @@ class CodeStub BASE_EMBEDDED {
   // registering stub in the stub cache.
   virtual void Activate(Code* code) { }
 
-  // BinaryOpStub needs to override this.
-  virtual Code::Kind GetCodeKind() const;
-
   // Add the code to a specialized cache, specific to an individual
   // stub type. Please note, this method must add the code object to a
   // roots object, otherwise we will remove the code during GC.
@@ -888,7 +886,7 @@ class LoadIndexedInterceptorStub : public PlatformCodeStub {
       : PlatformCodeStub(isolate) {}
 
   Code::Kind GetCodeKind() const OVERRIDE { return Code::HANDLER; }
-  Code::StubType GetStubType() OVERRIDE { return Code::FAST; }
+  Code::StubType GetStubType() const OVERRIDE { return Code::FAST; }
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(Load);
   DEFINE_PLATFORM_CODE_STUB(LoadIndexedInterceptor, PlatformCodeStub);
@@ -901,7 +899,7 @@ class LoadIndexedStringStub : public PlatformCodeStub {
       : PlatformCodeStub(isolate) {}
 
   Code::Kind GetCodeKind() const OVERRIDE { return Code::HANDLER; }
-  Code::StubType GetStubType() OVERRIDE { return Code::FAST; }
+  Code::StubType GetStubType() const OVERRIDE { return Code::FAST; }
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(Load);
   DEFINE_PLATFORM_CODE_STUB(LoadIndexedString, PlatformCodeStub);
@@ -941,7 +939,7 @@ class LoadFieldStub: public HandlerStub {
 
  protected:
   Code::Kind kind() const OVERRIDE { return Code::LOAD_IC; }
-  Code::StubType GetStubType() OVERRIDE { return Code::FAST; }
+  Code::StubType GetStubType() const OVERRIDE { return Code::FAST; }
 
  private:
   class LoadFieldByIndexBits : public BitField<int, 0, 13> {};
@@ -957,7 +955,7 @@ class KeyedLoadSloppyArgumentsStub : public HandlerStub {
 
  protected:
   Code::Kind kind() const OVERRIDE { return Code::KEYED_LOAD_IC; }
-  Code::StubType GetStubType() OVERRIDE { return Code::FAST; }
+  Code::StubType GetStubType() const OVERRIDE { return Code::FAST; }
 
  private:
   DEFINE_HANDLER_CODE_STUB(KeyedLoadSloppyArguments, HandlerStub);
@@ -977,7 +975,7 @@ class LoadConstantStub : public HandlerStub {
 
  protected:
   Code::Kind kind() const OVERRIDE { return Code::LOAD_IC; }
-  Code::StubType GetStubType() OVERRIDE { return Code::FAST; }
+  Code::StubType GetStubType() const OVERRIDE { return Code::FAST; }
 
  private:
   class ConstantIndexBits : public BitField<int, 0, kSubMinorKeyBits> {};
@@ -992,7 +990,7 @@ class StringLengthStub: public HandlerStub {
 
  protected:
   Code::Kind kind() const OVERRIDE { return Code::LOAD_IC; }
-  Code::StubType GetStubType() OVERRIDE { return Code::FAST; }
+  Code::StubType GetStubType() const OVERRIDE { return Code::FAST; }
 
   DEFINE_HANDLER_CODE_STUB(StringLength, HandlerStub);
 };
@@ -1021,7 +1019,7 @@ class StoreFieldStub : public HandlerStub {
 
  protected:
   Code::Kind kind() const OVERRIDE { return Code::STORE_IC; }
-  Code::StubType GetStubType() OVERRIDE { return Code::FAST; }
+  Code::StubType GetStubType() const OVERRIDE { return Code::FAST; }
 
  private:
   class StoreFieldByIndexBits : public BitField<int, 0, 13> {};
@@ -1074,7 +1072,7 @@ class StoreTransitionStub : public HandlerStub {
 
  protected:
   Code::Kind kind() const OVERRIDE { return Code::STORE_IC; }
-  Code::StubType GetStubType() OVERRIDE { return Code::FAST; }
+  Code::StubType GetStubType() const OVERRIDE { return Code::FAST; }
 
  private:
   class StoreFieldByIndexBits : public BitField<int, 0, 13> {};
@@ -2119,7 +2117,7 @@ class ScriptContextFieldStub : public HandlerStub {
   class SlotIndexBits
       : public BitField<int, kContextIndexBits, kSlotIndexBits> {};
 
-  Code::StubType GetStubType() OVERRIDE { return Code::FAST; }
+  Code::StubType GetStubType() const OVERRIDE { return Code::FAST; }
 
   DEFINE_CODE_STUB_BASE(ScriptContextFieldStub, HandlerStub);
 };

src/compiler.h

@@ -121,7 +121,7 @@ class CompilationInfo {
   Handle<SharedFunctionInfo> shared_info() const { return shared_info_; }
   Handle<Script> script() const { return script_; }
   void set_script(Handle<Script> script) { script_ = script; }
-  HydrogenCodeStub* code_stub() const {return code_stub_; }
+  CodeStub* code_stub() const { return code_stub_; }
   v8::Extension* extension() const { return extension_; }
   ScriptData** cached_data() const { return cached_data_; }
   ScriptCompiler::CompileOptions compile_options() const {
@@ -475,7 +475,7 @@ class CompilationInfo {
   // The script scope provided as a convenience.
   Scope* script_scope_;
   // For compiled stubs, the stub object
-  HydrogenCodeStub* code_stub_;
+  CodeStub* code_stub_;
   // The compiled code.
   Handle<Code> code_;