asiva@google.com
eaebf15f43
The stack frame iteration during GC was missing one slot in stub frames that did not save the pool pointer. - This change makes all stub frames uniform, i.e they always save/restore the pool pointer. This ensures that we will traverse all slots on the stack. - A new constant called kFirstObjectSlotFromFp has been added which is used as the slot to start stack traversal. (The ARM and MIPs changes will be in a different CL) R=iposva@google.com, regis@google.com, zra@google.com Review URL: https://codereview.chromium.org//63093003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@30088 260f80e4-7a28-3924-810f-c04153c831b5
50 lines
1.8 KiB
C++
50 lines
1.8 KiB
C++
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef VM_STACK_FRAME_MIPS_H_
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#define VM_STACK_FRAME_MIPS_H_
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namespace dart {
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/* MIPS Dart Frame Layout
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| | <- TOS
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Callee frame | ... |
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| current RA | (PC of current frame)
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| callee's PC marker |
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+--------------------+
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Current frame | ... T| <- SP of current frame
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| first local T|
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| caller's PP T|
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| caller's FP | <- FP of current frame
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| caller's RA | (PC of caller frame)
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| PC marker | (current frame's code entry + offset)
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+--------------------+
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Caller frame | last parameter | <- SP of caller frame
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| ... |
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T against a slot indicates it needs to be traversed during GC.
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*/
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static const int kDartFrameFixedSize = 4; // PP, FP, RA, PC marker.
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static const int kSavedPcSlotFromSp = -2;
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static const int kFirstObjectSlotFromFp = -2; // Used by GC to traverse stack.
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static const int kFirstLocalSlotFromFp = -2;
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static const int kSavedCallerPpSlotFromFp = -1;
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static const int kSavedCallerFpSlotFromFp = 0;
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static const int kSavedCallerPcSlotFromFp = 1;
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static const int kPcMarkerSlotFromFp = 2;
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static const int kParamEndSlotFromFp = 2; // One slot past last parameter.
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static const int kCallerSpSlotFromFp = 3;
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// Entry and exit frame layout.
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static const int kSavedContextSlotFromEntryFp = -23;
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static const int kExitLinkSlotFromEntryFp = -22;
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} // namespace dart
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#endif // VM_STACK_FRAME_MIPS_H_
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