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Publish minor changes to readme and configure files in main directory. Main directory and code directory licence texts are now fully updated. Copied from Perforce Change: 196994
120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
/* ss.h: STACK SCANNING
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*
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* $Id$
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* Copyright (c) 2001-2020 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 functions for decoding the context and scanning the root
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* registers. <design/stack-scan>.
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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 -- some of the mutator's state
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*
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* The jumpBuffer is used to capture most of the mutator's state on
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* entry to the MPS, but can't capture it all. See
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* <design/stack-scan#.sol.setjmp.scan>.
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*/
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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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/* StackHot -- capture a hot stack pointer
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*
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* Sets *stackOut to a stack pointer that includes the current frame.
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*/
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void StackHot(void **stackOut);
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/* STACK_CONTEXT_BEGIN -- save context */
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#define STACK_CONTEXT_BEGIN(arena) \
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BEGIN \
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StackContextStruct _sc; \
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STACK_CONTEXT_SAVE(&_sc); \
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AVER(arena->stackWarm == NULL); \
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StackHot(&arena->stackWarm); \
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AVER(arena->stackWarm < (void *)&_sc); /* <code/ss.c#assume.desc> */ \
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BEGIN
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/* STACK_CONTEXT_END -- clear context */
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#define STACK_CONTEXT_END(arena) \
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END; \
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AVER(arena->stackWarm != NULL); \
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arena->stackWarm = NULL; \
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END
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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 we can be confident what
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* it does via the source code at
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* <https://opensource.apple.com/source/Libc/Libc-825.24/i386/sys/_setjmp.s>,
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* and because _setjmp saves only the register set and the stack while
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* setjmp also saves the signal mask, which we don't care about. See
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* _setjmp(2). */
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#define STACK_CONTEXT_SAVE(sc) ((void)_setjmp((sc)->jumpBuffer))
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#else /* other platforms */
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#define STACK_CONTEXT_SAVE(sc) ((void)setjmp((sc)->jumpBuffer))
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#endif /* platform defines */
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/* StackScan -- scan the mutator's stack and registers
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*
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* This must be called between STACK_CONTEXT_BEGIN and
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* STACK_CONTEXT_END.
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*/
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extern Res StackScan(ScanState ss, void *stackCold,
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mps_area_scan_t scan_area, void *closure);
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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) 2001-2020 Ravenbrook Limited <http://www.ravenbrook.com/>.
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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
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* distribution.
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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 AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* 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
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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