Simplify JumpTarget::ComputeEntryFrame. Eliminate a separate pass...

src/register-allocator.h

 // Copyright 2008 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
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 class RegisterAllocator BASE_EMBEDDED {
  public:
   explicit RegisterAllocator(CodeGenerator* cgen) : cgen_(cgen) {}
 
   // A register file with each of the reserved registers counted once.
   static RegisterFile Reserved();
 
   // Unuse all the reserved registers in a register file.
   static void UnuseReserved(RegisterFile* register_file);
 
+  // True if the register is reserved by the code generator, false if it
+  // can be freely used by the allocator.
+  static bool IsReserved(int reg_code);
+  static bool IsReserved(Register reg) { return IsReserved(reg); }
+
   // Predicates and accessors for the registers' reference counts.
   bool is_used(int reg_code) const { return registers_.is_used(reg_code); }
   bool is_used(Register reg) const { return registers_.is_used(reg.code()); }
   int count(int reg_code) const { return registers_.count(reg_code); }
   int count(Register reg) const { return registers_.count(reg.code()); }
 
   // Explicitly record a reference to a register.
   void Use(Register reg) { registers_.Use(reg); }
 
   // Explicitly record that a register will no longer be used.
@@ skipping 36 matching lines @@
   }
 
  private:
   CodeGenerator* cgen_;
   RegisterFile registers_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_REGISTER_ALLOCATOR_H_