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87eeceac03
No need for a prototype for StackScanInner. Explain the fragility of the analysis and how we cope with it. Copied from Perforce Change: 187425 ServerID: perforce.ravenbrook.com
127 lines
4.1 KiB
C
127 lines
4.1 KiB
C
/* ss.h: STACK SCANNING
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*
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* $Id$
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* Copyright (c) 2001 Ravenbrook Limited. See end of file for license.
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*
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* This module saves the mutator context on entry to the MPS, and
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* provides functsions for decoding the context and scanning the root
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* registers. See <design/ss/>.
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*/
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#ifndef ss_h
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#define ss_h
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#include "mpm.h"
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/* StackContext -- structure containing the callee-save registers and
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* the stack pointer */
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#include <setjmp.h>
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typedef struct StackContextStruct {
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jmp_buf jumpBuffer;
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} StackContextStruct;
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/* STACK_CONTEXT_BEGIN -- enter arena and save context */
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#define STACK_CONTEXT_BEGIN(arena) BEGIN \
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StackContextStruct _sc; \
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ArenaEnter(arena); \
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STACK_CONTEXT_SAVE(&_sc); \
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AVER(arena->scAtArenaEnter == NULL); \
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arena->scAtArenaEnter = &_sc; \
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BEGIN
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/* STACK_CONTEXT_END -- clear context and leave arena */
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#define STACK_CONTEXT_END(arena) END; \
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arena->scAtArenaEnter = NULL; \
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ArenaLeave(arena); \
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END
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/* StackContextStackTop -- return the "top" of the mutator's stack at
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* the point when the context was saved by STACK_CONTEXT_BEGIN. */
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extern Addr *StackContextStackTop(StackContext sc);
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/* StackContextScan -- scan references in the stack context */
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extern Res StackContextScan(ScanState ss, StackContext sc);
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/* STACK_CONTEXT_SAVE -- save the callee-saves and stack pointer */
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#if defined(MPS_OS_XC)
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/* We call _setjmp rather than setjmp because _setjmp saves only the
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* register set and the stack while setjmp also saves the signal mask.
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* See _setjmp(2). */
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#define STACK_CONTEXT_SAVE(sc) BEGIN \
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int _set = _setjmp((sc)->jumpBuffer); \
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AVER(_set == 0); \
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END
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#else /* other platforms */
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#define STACK_CONTEXT_SAVE(sc) BEGIN \
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int _set = setjmp((sc)->jumpBuffer); \
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AVER(_set == 0); \
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END
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#endif /* platform defines */
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/* StackScan -- scan the mutator's stack and registers */
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extern Res StackScan(ScanState ss, Addr *stackBot);
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#endif /* ss_h */
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/* C. COPYRIGHT AND LICENSE
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*
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* Copyright (C) 2001-2002 Ravenbrook Limited <http://www.ravenbrook.com/>.
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* All rights reserved. This is an open source license. Contact
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* Ravenbrook for commercial licensing options.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Redistributions in any form must be accompanied by information on how
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* to obtain complete source code for this software and any accompanying
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* software that uses this software. The source code must either be
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* included in the distribution or be available for no more than the cost
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* of distribution plus a nominal fee, and must be freely redistributable
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* under reasonable conditions. For an executable file, complete source
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* code means the source code for all modules it contains. It does not
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* include source code for modules or files that typically accompany the
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* major components of the operating system on which the executable file
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* runs.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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* PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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