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
118 lines
4.7 KiB
C
118 lines
4.7 KiB
C
/*--------------------------------------------------------------------*/
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/*--- ExeContexts: long-lived stack traces. pub_tool_execontext.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_EXECONTEXT_H
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#define __PUB_TOOL_EXECONTEXT_H
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// It's an abstract type.
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typedef
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struct _ExeContext
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ExeContext;
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// Resolution type used to decide how closely to compare two errors for
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// equality.
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typedef
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enum { Vg_LowRes, Vg_MedRes, Vg_HighRes }
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VgRes;
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// Take a snapshot of the client's stack. Search our collection of
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// ExeContexts to see if we already have it, and if not, allocate a
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// new one. Either way, return a pointer to the context. Context size
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// controlled by --num-callers option.
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//
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// This should only be used for long-lived stack traces. If you want a
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// short-lived stack trace, use VG_(get_StackTrace)().
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//
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// If called from generated code, use VG_(get_running_tid)() to get the
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// current ThreadId. If called from non-generated code, the current
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// ThreadId should be passed in by the core. The initial IP value to
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// use is adjusted by first_ip_delta before the stack is unwound.
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// A safe value to pass is zero.
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//
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// See comments in pub_tool_stacktrace.h for precise definition of
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// the meaning of the code addresses in the returned ExeContext.
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extern
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ExeContext* VG_(record_ExeContext) ( ThreadId tid, Word first_ip_delta );
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// Trivial version of VG_(record_ExeContext), which just records the
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// thread's current program counter but does not do any stack
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// unwinding. This is useful in some rare cases when we suspect the
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// stack might be outside mapped storage, and so unwinding
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// might cause a segfault. In this case we can at least safely
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// produce a one-element stack trace, which is better than nothing.
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extern
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ExeContext* VG_(record_depth_1_ExeContext)( ThreadId tid );
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// Apply a function to every element in the ExeContext. 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_ExeContext)( void(*action)(UInt n, Addr ip),
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ExeContext* ec, UInt n_ips );
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// Compare two ExeContexts. Number of callers considered depends on `res':
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// Vg_LowRes: 2
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// Vg_MedRes: 4
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// Vg_HighRes: all
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extern Bool VG_(eq_ExeContext) ( VgRes res, ExeContext* e1, ExeContext* e2 );
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// Print an ExeContext.
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extern void VG_(pp_ExeContext) ( ExeContext* ec );
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// Get the 32-bit unique reference number for this ExeContext
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// (the "ExeContext Unique"). Guaranteed to be nonzero and to be a
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// multiple of four (iow, the lowest two bits are guaranteed to
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// be zero, so that callers can store other information there.
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extern UInt VG_(get_ECU_from_ExeContext)( ExeContext* e );
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// How many entries (frames) in this ExeContext?
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extern Int VG_(get_ExeContext_n_ips)( ExeContext* e );
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// Find the ExeContext that has the given ECU, if any.
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// NOTE: very slow. Do not call often.
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extern ExeContext* VG_(get_ExeContext_from_ECU)( UInt uniq );
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// Make an ExeContext containing just 'a', and nothing else
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ExeContext* VG_(make_depth_1_ExeContext_from_Addr)( Addr a );
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// Is this a plausible-looking ECU ? Catches some obvious stupid
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// cases, but does not guarantee that the ECU is really valid, that
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// is, has an associated ExeContext.
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static inline Bool VG_(is_plausible_ECU)( UInt ecu ) {
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return (ecu > 0) && ((ecu & 3) == 0);
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}
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// Make an ExeContext containing exactly the specified stack frames.
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ExeContext* VG_(make_ExeContext_from_StackTrace)( Addr* ips, UInt n_ips );
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#endif // __PUB_TOOL_EXECONTEXT_H
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/*--------------------------------------------------------------------*/
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/*--- end ---*/
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/*--------------------------------------------------------------------*/
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