Alexander Markov
c6c4748185
Change-Id: I09192e4e929a397920c217b605580f8c4880e7c2 Reviewed-on: https://dart-review.googlesource.com/74002 Commit-Queue: Alexander Markov <alexmarkov@google.com> Reviewed-by: Vyacheslav Egorov <vegorov@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com> Reviewed-by: Régis Crelier <regis@google.com>
65 lines
2.6 KiB
C++
65 lines
2.6 KiB
C++
// Copyright (c) 2018, 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_KBC_H_
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#define RUNTIME_VM_STACK_FRAME_KBC_H_
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namespace dart {
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/* Kernel Bytecode Frame Layout
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IMPORTANT: KBC stack is growing upwards which is different from all other
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architectures. This enables efficient addressing for locals via unsigned index.
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| | <- TOS
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Callee frame | ... |
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| saved FP | (FP of current frame)
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| saved PC | (PC of current frame)
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| code object |
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| function object |
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+--------------------+
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Current frame | ... T| <- SP of current frame
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| ... T|
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| first local T| <- FP of current frame
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| caller's FP *|
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| caller's PC *|
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| code object T| (current frame's code object)
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| function object T| (current frame's function object)
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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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* against a slot indicates that it can be traversed during GC
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because it will look like a smi to the visitor.
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*/
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static const int kKBCDartFrameFixedSize = 4; // Function, Code, PC, FP
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static const int kKBCSavedPcSlotFromSp = 3;
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static const int kKBCFirstObjectSlotFromFp = -4; // Used by GC.
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static const int kKBCLastFixedObjectSlotFromFp = -3;
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static const int kKBCSavedCallerFpSlotFromFp = -1;
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static const int kKBCSavedCallerPcSlotFromFp = -2;
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static const int kKBCCallerSpSlotFromFp = -kKBCDartFrameFixedSize - 1;
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static const int kKBCPcMarkerSlotFromFp = -3;
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static const int kKBCFunctionSlotFromFp = -4;
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static const int kKBCParamEndSlotFromFp = 4;
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// Entry and exit frame layout.
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static const int kKBCEntrySavedSlots = 3;
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static const int kKBCExitLinkSlotFromEntryFp = 0;
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static const int kKBCSavedArgDescSlotFromEntryFp = 1;
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static const int kKBCSavedPpSlotFromEntryFp = 2;
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// Value for stack limit that is used to cause an interrupt.
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// Note that on KBC stack is growing upwards so interrupt limit is 0 unlike
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// on all other architectures.
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static const uword kKBCInterruptStackLimit = 0;
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} // namespace dart
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#endif // RUNTIME_VM_STACK_FRAME_KBC_H_
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