Optimize 'typeof <expr> == <string literal>' in the full codegen.

src/full-codegen.h

 // Copyright 2010 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 305 matching lines @@
     false_label_ = if_false;
     Visit(expr);
     context_ = saved_context;
     true_label_ = saved_true;
     false_label_ = saved_false;
   }
 
   void VisitDeclarations(ZoneList<Declaration*>* declarations);
   void DeclareGlobals(Handle<FixedArray> pairs);
 
+  // Try to perform a comparison as a fast inlined literal compare if
+  // the operands allow it.  Returns true if the compare operations
+  // has been matched and all code generated; false otherwise.
+  bool TryLiteralCompare(Token::Value op,
+                         Expression* left,
+                         Expression* right,
+                         Label* if_true,
+                         Label* if_false,
+                         Label* fall_through);
+
   // Platform-specific code for a variable, constant, or function
   // declaration.  Functions have an initial value.
   void EmitDeclaration(Variable* variable,
                        Variable::Mode mode,
                        FunctionLiteral* function);
 
   // Platform-specific return sequence
   void EmitReturnSequence();
 
   // Platform-specific code sequences for calls
@@ skipping 43 matching lines @@
 
   // Complete a named property assignment.  The receiver is expected on top
   // of the stack and the right-hand-side value in the accumulator.
   void EmitNamedPropertyAssignment(Assignment* expr);
 
   // Complete a keyed property assignment.  The receiver and key are
   // expected on top of the stack and the right-hand-side value in the
   // accumulator.
   void EmitKeyedPropertyAssignment(Assignment* expr);
 
-  // Helper for compare operations. Expects the null-value in a register.
-  void EmitNullCompare(bool strict,
-                       Register obj,
-                       Register null_const,
-                       Label* if_true,
-                       Label* if_false,
-                       Register scratch);
-
   void SetFunctionPosition(FunctionLiteral* fun);
   void SetReturnPosition(FunctionLiteral* fun);
   void SetStatementPosition(Statement* stmt);
   void SetExpressionPosition(Expression* expr, int pos);
   void SetStatementPosition(int pos);
   void SetSourcePosition(int pos);
 
   // Non-local control flow support.
   void EnterFinallyBlock();
   void ExitFinallyBlock();
@@ skipping 23 matching lines @@
   // Load a value from the current context. Indices are defined as an enum
   // in v8::internal::Context.
   void LoadContextField(Register dst, int context_index);
 
   // AST node visit functions.
 #define DECLARE_VISIT(type) virtual void Visit##type(type* node);
   AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT
   // Handles the shortcutted logical binary operations in VisitBinaryOperation.
   void EmitLogicalOperation(BinaryOperation* expr);
+
+  void VisitForTypeofValue(Expression* expr, Location where);
+
   void VisitLogicalForValue(Expression* expr,
                             Token::Value op,
                             Location where,
                             Label* done);
 
 
   MacroAssembler* masm_;
   CompilationInfo* info_;
 
   Label return_label_;
   NestedStatement* nesting_stack_;
   int loop_depth_;
 
   Expression::Context context_;
   Location location_;
   Label* true_label_;
   Label* false_label_;
 
   friend class NestedStatement;
 
   DISALLOW_COPY_AND_ASSIGN(FullCodeGenerator);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FULL_CODEGEN_H_