Support immediate operands for array bounds checks.

runtime/vm/locations.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_LOCATIONS_H_
 #define VM_LOCATIONS_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/bitfield.h"
 
 namespace dart {
 
 class BufferFormatter;
+class Value;
 
 // Location objects are used to connect register allocator and code generator.
 // Instruction templates used by code generator have a corresponding
 // LocationSummary object which specifies expected location for every input
 // and output.
 // Each location is encoded as a single word: for non-constant locations
 // low 3 bits denote location kind, rest is kind specific location payload
 // e.g. for REGISTER kind payload is register code (value of the Register
 // enumeration), constant locations contain a tagged (low 2 bits are set to 01)
 // Object handle
@@ skipping 197 matching lines @@
     return kind() == kDoubleStackSlot;
   }
 
 
   intptr_t stack_index() const {
     ASSERT(IsStackSlot() || IsDoubleStackSlot());
     // Decode stack index manually to preserve sign.
     return payload() - kStackIndexBias;
   }
 
+  // Constants.
+  static Location RegisterOrConstant(Value* value);
+  static Location FixedRegisterOrConstant(Value* value, Register reg);
+
   const char* Name() const;
   void PrintTo(BufferFormatter* f) const;
   void Print() const;
 
   // Compare two locations.
   bool Equals(Location other) const {
     return value_ == other.value_;
   }
 
  private:
@@ skipping 163 matching lines @@
   BitmapBuilder* stack_bitmap_;
 
   const ContainsCall contains_call_;
   RegisterSet live_registers_;
 };
 
 
 }  // namespace dart
 
 #endif  // VM_LOCATIONS_H_