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876193b31a
This change makes CTX available by not caching the current context while in Dart code. Instead the current context is held in a local variable (:saved_current_context_var) and is passed as argument in CTX at calls. This also simplifies a lot of code in the debugger: As a result, Isolate::top_context is not needed anymore since the current context can always be extracted from a Dart frame. R=vegorov@google.com Review URL: https://codereview.chromium.org//678763004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@41422 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_IA32_H_
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#define VM_STACK_FRAME_IA32_H_
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namespace dart {
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/* IA32 Dart Frame Layout
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| | <- TOS
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Callee frame | ... |
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| saved EBP | (EBP of current frame)
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| saved PC | (PC of current frame)
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+--------------------+
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Current frame | ... T| <- ESP of current frame
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| first local T|
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| PC marker | (current frame's code entry + offset)
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| caller's EBP | <- EBP 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 | <- ESP 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 = 3; // PC marker, EBP, PC.
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static const int kSavedPcSlotFromSp = -1;
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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 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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// No pool pointer on IA32 (indicated by aliasing saved fp).
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static const int kSavedCallerPpSlotFromFp = kSavedCallerFpSlotFromFp;
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// Entry and exit frame layout.
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static const int kExitLinkSlotFromEntryFp = -5;
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} // namespace dart
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#endif // VM_STACK_FRAME_IA32_H_
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