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89ce54fe0e
We've been getting away with skipping this slot because - ObjectPools are allocated into old space and never move, and - the ObjectPools are also reachable from the PC marker in the caller's frame. However, ObjectPools will become movable during compacting GCs. Bug: https://github.com/dart-lang/sdk/issues/30978 Change-Id: Ied3a1588365fe5362ad7f1d2d446a7a59df6ced6 Reviewed-on: https://dart-review.googlesource.com/10680 Reviewed-by: Siva Annamalai <asiva@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>
58 lines
2.1 KiB
C++
58 lines
2.1 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 RUNTIME_VM_STACK_FRAME_X64_H_
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#define RUNTIME_VM_STACK_FRAME_X64_H_
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namespace dart {
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/* X64 Dart Frame Layout
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| | <- TOS
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Callee frame | ... |
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| saved PP |
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| code object |
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| saved RBP | (RBP of current frame)
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| saved PC | (PC of current frame)
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+--------------------+
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Current frame | ... T| <- RSP of current frame
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| first local T|
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| caller's PP T|
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| code object T| (current frame's code object)
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| caller's RBP | <- RBP of current frame
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| caller's ret addr | (PC of caller frame)
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+--------------------+
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Caller frame | last parameter | <- RSP 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; // PC marker, RBP, PP, PC.
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static const int kSavedPcSlotFromSp = -1;
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static const int kFirstObjectSlotFromFp = -1; // Used by GC to traverse stack.
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static const int kLastFixedObjectSlotFromFp = -2;
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static const int kFirstLocalSlotFromFp = -3;
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static const int kSavedCallerPpSlotFromFp = -2;
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static const int kPcMarkerSlotFromFp = -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 kParamEndSlotFromFp = 1; // One slot past last parameter.
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static const int kCallerSpSlotFromFp = 2;
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static const int kSavedAboveReturnAddress = 3; // Saved above return address.
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// Entry and exit frame layout.
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#if defined(_WIN64)
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static const int kExitLinkSlotFromEntryFp = -32;
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#else
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static const int kExitLinkSlotFromEntryFp = -10;
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#endif // defined(_WIN64)
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} // namespace dart
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#endif // RUNTIME_VM_STACK_FRAME_X64_H_
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