mirror of
git://git.sv.gnu.org/emacs.git
synced 2025-12-28 08:11:05 -08:00
129 lines
4.2 KiB
C
129 lines
4.2 KiB
C
/* ss.h: STACK SCANNING
|
|
*
|
|
* $Id$
|
|
* Copyright (c) 2001 Ravenbrook Limited. See end of file for license.
|
|
*
|
|
* This module saves the mutator context on entry to the MPS, and
|
|
* provides functions for decoding the context and scanning the root
|
|
* registers. See <design/ss/>.
|
|
*/
|
|
|
|
#ifndef ss_h
|
|
#define ss_h
|
|
|
|
#include "mpm.h"
|
|
|
|
|
|
/* StackContext -- structure containing the callee-save registers and
|
|
* the stack pointer */
|
|
|
|
#include <setjmp.h>
|
|
|
|
typedef struct StackContextStruct {
|
|
jmp_buf jumpBuffer;
|
|
} StackContextStruct;
|
|
|
|
|
|
/* STACK_CONTEXT_BEGIN -- save context */
|
|
|
|
#define STACK_CONTEXT_BEGIN(arena) \
|
|
BEGIN \
|
|
StackContextStruct _sc; \
|
|
STACK_CONTEXT_SAVE(&_sc); \
|
|
AVER(arena->scAtArenaEnter == NULL); \
|
|
arena->scAtArenaEnter = &_sc; \
|
|
BEGIN
|
|
|
|
|
|
/* STACK_CONTEXT_END -- clear context and leave arena */
|
|
|
|
#define STACK_CONTEXT_END(arena) \
|
|
END; \
|
|
AVER(arena->scAtArenaEnter != NULL); \
|
|
arena->scAtArenaEnter = NULL; \
|
|
END
|
|
|
|
|
|
/* StackContextStackTop -- return the "top" of the mutator's stack at
|
|
* the point when the context was saved by STACK_CONTEXT_SAVE. */
|
|
|
|
extern Addr *StackContextStackTop(StackContext sc);
|
|
|
|
|
|
/* StackContextScan -- scan references in the stack context */
|
|
|
|
extern Res StackContextScan(ScanState ss, StackContext sc);
|
|
|
|
|
|
/* STACK_CONTEXT_SAVE -- save the callee-saves and stack pointer */
|
|
|
|
#if defined(MPS_OS_XC)
|
|
|
|
/* We call _setjmp rather than setjmp because we can be confident what
|
|
* it does via the source code at
|
|
* <http://www.opensource.apple.com/source/Libc/Libc-825.24/i386/sys/_setjmp.s>,
|
|
* and because _setjmp saves only the register set and the stack while
|
|
* setjmp also saves the signal mask, which we don't care about. See
|
|
* _setjmp(2). */
|
|
|
|
#define STACK_CONTEXT_SAVE(sc) ((void)_setjmp((sc)->jumpBuffer))
|
|
|
|
#else /* other platforms */
|
|
|
|
#define STACK_CONTEXT_SAVE(sc) ((void)setjmp((sc)->jumpBuffer))
|
|
|
|
#endif /* platform defines */
|
|
|
|
|
|
/* StackScan -- scan the mutator's stack and registers
|
|
*
|
|
* This must be called between STACK_CONTEXT_BEGIN and
|
|
* STACK_CONTEXT_END.
|
|
*/
|
|
|
|
extern Res StackScan(ScanState ss, Addr *stackBot);
|
|
|
|
|
|
#endif /* ss_h */
|
|
|
|
|
|
/* C. COPYRIGHT AND LICENSE
|
|
*
|
|
* Copyright (C) 2001-2002 Ravenbrook Limited <http://www.ravenbrook.com/>.
|
|
* All rights reserved. This is an open source license. Contact
|
|
* Ravenbrook for commercial licensing options.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* 3. Redistributions in any form must be accompanied by information on how
|
|
* to obtain complete source code for this software and any accompanying
|
|
* software that uses this software. The source code must either be
|
|
* included in the distribution or be available for no more than the cost
|
|
* of distribution plus a nominal fee, and must be freely redistributable
|
|
* under reasonable conditions. For an executable file, complete source
|
|
* code means the source code for all modules it contains. It does not
|
|
* include source code for modules or files that typically accompany the
|
|
* major components of the operating system on which the executable file
|
|
* runs.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
|
|
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
|
|
* PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
|
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
|
|
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|