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84 lines
3.4 KiB
C
84 lines
3.4 KiB
C
/* ssan.c: GENERIC STACK SCANNING
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*
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* $Id$
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* Copyright (c) 2001-2014 Ravenbrook Limited. See end of file for license.
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*
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* This makes a best effort to decode the stack context and scan the
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* registers which may contain roots, using only the features of the
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* Standard C library. See <design/ss/>.
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*/
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#include "ss.h"
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SRCID(ssan, "$Id$");
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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_SAVE.
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*
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* .assume: This assumes that the structure pointed to by sc is
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* stack-allocated "above" the mutator's stack, and so its address is
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* a conservative approximation to the top of the mutator's stack. The
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* use of STACK_CONTEXT_SAVE in mpsi.c assures this.
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*/
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Addr *StackContextStackTop(StackContext sc)
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{
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return (void *)sc;
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}
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/* StackContextScan -- scan references in the stack context
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*
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* This conservatively scans the whole of the StackContext. The
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* PointerAlignDown is necessary in case the size of the jump buffer
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* is not a multiple of sizeof(Addr).
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*/
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Res StackContextScan(ScanState ss, StackContext sc)
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{
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return TraceScanAreaTagged(ss, (void *)sc,
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PointerAlignDown(sc + 1, sizeof(Addr)));
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}
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/* C. COPYRIGHT AND LICENSE
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*
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* Copyright (C) 2001-2014 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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