mirror of
https://github.com/Zenithsiz/ftmemsim-valgrind.git
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ba2ece03b8
stack unwind mechanism (the function VG_(record_ExeContext) et al), clears up some associated kludges, and makes suppression matching work more reliably. Prior to this commit, a stack snapshot contained, at [0], the IP of the relevant thread, and at all positions [1] and above, the return addresses for the open calls. When showing a snapshot to the user (in VG_(apply_StackTrace)), and searching the stack for stack blocks (in VG_(get_data_description)), 1 is subtracted from positions [1] and above, so as to move these return addresses back to the last byte of the calling instruction. This subtraction is also done even in VG_(get_StackTrace_wrk) itself, in order to make the stack unwinding work at all. It turns out that suppression-vs-function-name matching requires the same hack, and sometimes failed to match suppressions that should match, because of this self-same problem. So the commit changes the stack unwinder itself, so that entries [1] and above point to the last byte of the call instruction, rather than the return address. The associated kludges in VG_(apply_StackTrace) and VG_(get_StackTrace_wrk) are removed, and suppression matching is observed to work in a case where it failed before. git-svn-id: svn://svn.valgrind.org/valgrind/trunk@8818
83 lines
3.5 KiB
C
83 lines
3.5 KiB
C
/*--------------------------------------------------------------------*/
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/*--- Stack traces: getting, traversing, printing. ---*/
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/*--- tool_stacktrace.h ---*/
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/*--------------------------------------------------------------------*/
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/*
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This file is part of Valgrind, a dynamic binary instrumentation
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framework.
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Copyright (C) 2000-2008 Julian Seward
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jseward@acm.org
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307, USA.
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The GNU General Public License is contained in the file COPYING.
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*/
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#ifndef __PUB_TOOL_STACKTRACE_H
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#define __PUB_TOOL_STACKTRACE_H
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// The basic stack trace type: just an array of code addresses.
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typedef Addr* StackTrace;
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// Walks the stack to get instruction pointers from the top stack frames
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// for thread 'tid'. Maximum of 'n_ips' addresses put into 'ips';
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// 0 is the top of the stack, 1 is its caller, etc. Everything from
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// ips[return_value] onwards is undefined and should not be read.
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// The initial IP value to use is adjusted by first_ip_delta before
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// the stack is unwound. A safe value to pass is zero.
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//
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// The specific meaning of the returned addresses is:
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//
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// [0] is the IP of thread 'tid'
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// [1] points to the last byte of the call instruction that called [0].
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// [2] points to the last byte of the call instruction that called [1].
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// etc etc
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//
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// Hence ips[0 .. return_value-1] should all point to currently
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// 'active' (in the sense of a stack of unfinished function calls)
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// instructions. [0] points to the start of an arbitrary instruction.#
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// [1 ..] point to the last byte of a chain of call instructions.
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//
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// If sps and fps are non-NULL, the corresponding frame-pointer and
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// stack-pointer values for each frame are stored there.
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extern UInt VG_(get_StackTrace) ( ThreadId tid,
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/*OUT*/StackTrace ips, UInt n_ips,
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/*OUT*/StackTrace sps,
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/*OUT*/StackTrace fps,
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Word first_ip_delta );
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// Apply a function to every element in the StackTrace. The parameter 'n'
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// gives the index of the passed ip. Doesn't go below main() unless
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// --show-below-main=yes is set.
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extern void VG_(apply_StackTrace)( void(*action)(UInt n, Addr ip),
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StackTrace ips, UInt n_ips );
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// Print a StackTrace.
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extern void VG_(pp_StackTrace) ( StackTrace ips, UInt n_ips );
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// Gets and immediately prints a StackTrace. Just a bit simpler than
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// calling VG_(get_StackTrace)() then VG_(pp_StackTrace)().
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extern void VG_(get_and_pp_StackTrace) ( ThreadId tid, UInt n_ips );
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#endif // __PUB_TOOL_STACKTRACE_H
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/*--------------------------------------------------------------------*/
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/*--- end ---*/
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/*--------------------------------------------------------------------*/
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