VM: New calling convention for generated code.

runtime/vm/stack_frame_mips.h

 // Copyright (c) 2013, 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_STACK_FRAME_MIPS_H_
 #define VM_STACK_FRAME_MIPS_H_
 
 namespace dart {
 
 /* MIPS Dart Frame Layout
 
                |                    | <- TOS
 Callee frame   | ...                |
                | current RA         |    (PC of current frame)
                | callee's PC marker |
                +--------------------+
 Current frame  | ...               T| <- SP of current frame
                | first local       T|
                | caller's PP       T|
+               | CODE_REG          T|    (current frame's code object)
                | caller's FP        | <- FP of current frame
                | caller's RA        |    (PC of caller frame)
-               | PC marker          |    (current frame's code entry + offset)
                +--------------------+
 Caller frame   | last parameter     | <- SP of caller frame
                |  ...               |
 
                T against a slot indicates it needs to be traversed during GC.
 */
 
 static const int kDartFrameFixedSize = 4;  // PP, FP, RA, PC marker.
-static const int kSavedPcSlotFromSp = -2;
+static const int kSavedPcSlotFromSp = -1;
 
 static const int kFirstObjectSlotFromFp = -1;  // Used by GC to traverse stack.
 
-static const int kFirstLocalSlotFromFp = -2;
-static const int kSavedCallerPpSlotFromFp = -1;
+static const int kFirstLocalSlotFromFp = -3;
+static const int kSavedCallerPpSlotFromFp = -2;
+static const int kPcMarkerSlotFromFp = -1;
 static const int kSavedCallerFpSlotFromFp = 0;
 static const int kSavedCallerPcSlotFromFp = 1;
-static const int kPcMarkerSlotFromFp = 2;
-static const int kParamEndSlotFromFp = 2;  // One slot past last parameter.
-static const int kCallerSpSlotFromFp = 3;
+static const int kParamEndSlotFromFp = 1;  // One slot past last parameter.
+static const int kCallerSpSlotFromFp = 2;
 
 // Entry and exit frame layout.
-static const int kExitLinkSlotFromEntryFp = -23;
+static const int kExitLinkSlotFromEntryFp = -24;
 
 }  // namespace dart
 
 #endif  // VM_STACK_FRAME_MIPS_H_