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107 lines
4.1 KiB
C
107 lines
4.1 KiB
C
/* ss.c: 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 is part of the code that scans the stack and fixes the registers
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* that may contain roots. See <design/thread-manager/>
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*
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* Each platform ABI has a set of callee-save registers that may still
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* contain roots. The StackScan function is defined for each ABI in source
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* files like ss*.c and ss*.asm. That function saves the callee save
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* registers in its frame, then calls StackScanInner to do the scanning.
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*/
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#include "mpm.h"
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SRCID(ss, "$Id$");
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/* StackScanInner -- carry out stack scanning
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*
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* This function should be called by StackScan once it has saved the
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* callee-save registers for the platform ABI in order to do the actual
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* scanning.
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*/
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Res StackScanInner(ScanState ss,
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Addr *stackBot,
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Addr *stackTop,
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Count nSavedRegs)
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{
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Arena arena;
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Res res;
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AVERT(ScanState, ss);
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AVER(stackTop < stackBot);
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AVER(AddrIsAligned((Addr)stackTop, sizeof(Addr))); /* .assume.align */
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AVER(0 < nSavedRegs);
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AVER(nSavedRegs < 128); /* sanity check */
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arena = ss->arena;
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/* If a stack pointer was stored when we entered the arena (through the
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MPS interface in mpsi*.c) then we scan just the saved registers and
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the stack starting there, in order to avoid false ambiguous references
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in the MPS stack. This is particularly important for transforms
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(trans.c). Otherwise, scan the whole stack. */
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if (arena->stackAtArenaEnter != NULL) {
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AVER(stackTop < arena->stackAtArenaEnter);
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AVER(arena->stackAtArenaEnter < stackBot);
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res = TraceScanAreaTagged(ss, stackTop, stackTop + nSavedRegs);
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if (res != ResOK)
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return res;
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res = TraceScanAreaTagged(ss, arena->stackAtArenaEnter, stackBot);
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if (res != ResOK)
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return res;
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} else {
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res = TraceScanAreaTagged(ss, stackTop, stackBot);
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if (res != ResOK)
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return res;
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}
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return ResOK;
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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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