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/*--- ErrorMgr: management of errors and suppressions. ---*/
/*--- pub_tool_errormgr.h ---*/
This file is part of Valgrind, a dynamic binary instrumentation
Copyright (C) 2000-2013 Julian Seward
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
#include "pub_tool_execontext.h"
/* ------------------------------------------------------------------ */
/* Error records contain enough info to generate an error report. The idea
is that (typically) the same few points in the program generate thousands
of errors, and we don't want to spew out a fresh error message for each
one. Instead, we use these structures to common up duplicates.
Int /* Do not make this unsigned! */
/* The tool-relevant parts of an Error are:
kind: what kind of error; must be in the range (0..)
addr: use is optional. 0 by default.
string: use is optional. NULL by default.
extra: use is optional. NULL by default. void* so it's extensible.
struct _Error
/* Useful in VG_(tdict).tool_error_matches_suppression(),
* VG_(tdict).tool_pp_Error(), etc */
ExeContext* VG_(get_error_where) ( const Error* err );
ErrorKind VG_(get_error_kind) ( const Error* err );
Addr VG_(get_error_address) ( const Error* err );
const HChar* VG_(get_error_string) ( const Error* err );
void* VG_(get_error_extra) ( const Error* err );
/* Call this when an error occurs. It will be recorded if it hasn't been
seen before. If it has, the existing error record will have its count
'tid' can be found as for VG_(record_ExeContext)(). The `s' string
and `extra' field can be stack-allocated; they will be copied by the core
if needed (but it won't be copied if it's NULL).
Note that `ekind' and `s' are also used to generate a suppression.
`s' should therefore not contain data depending on the specific
execution (such as addresses, values) but should rather contain
e.g. a system call parameter symbolic name.
`extra' is also (optionally) used for generating a suppression
(see pub_tool_tooliface.h print_extra_suppression_info).
If no 'a', 's' or 'extra' of interest needs to be recorded, just use
NULL for them. */
extern void VG_(maybe_record_error) ( ThreadId tid, ErrorKind ekind,
Addr a, const HChar* s, void* extra );
/* Similar to VG_(maybe_record_error)(), except this one doesn't record the
error -- useful for errors that can only happen once. The errors can be
suppressed, though. Return value is True if it was suppressed.
'print_error' dictates whether to print the error, which is a bit of a
hack that's useful sometimes if you just want to know if the error would
be suppressed without possibly printing it. 'count_error' dictates
whether to add the error in the error total count (another mild hack). */
extern Bool VG_(unique_error) ( ThreadId tid, ErrorKind ekind,
Addr a, const HChar* s, void* extra,
ExeContext* where, Bool print_error,
Bool allow_GDB_attach, Bool count_error );
/* Gets from fd (an opened suppression file) a non-blank, non-comment
line containing suppression extra information (e.g. the syscall
line for the Param memcheck suppression kind. bufpp is a pointer
to a buffer that must be allocated with VG_(malloc);
nBufp is a pointer to size_t holding its size; if the buffer is too
small for the line, it will be realloc'd until big enough (updating
*bufpp and *nBufp in the process). (It will bomb out if the size
gets ridiculous). Skips leading spaces on the line. Increments
*lineno with the number of lines read. Returns True if no extra
information line could be read. */
extern Bool VG_(get_line) ( Int fd, HChar** bufpp, SizeT* nBufp, Int* lineno );
/* ------------------------------------------------------------------ */
/* Suppressions describe errors which we want to suppress, ie, not
show the user, usually because it is caused by a problem in a library
which we can't fix, replace or work around. Suppressions are read from
a file at startup time. This gives flexibility so that new
suppressions can be added to the file as and when needed.
Int /* Do not make this unsigned! */
/* The tool-relevant parts of a suppression are:
kind: what kind of suppression; must be in the range (0..)
string: use is optional. NULL by default.
extra: use is optional. NULL by default. void* so it's extensible.
struct _Supp
/* Useful in VG_(tdict).tool_error_matches_suppression() */
SuppKind VG_(get_supp_kind) ( const Supp* su );
HChar* VG_(get_supp_string) ( const Supp* su );
void* VG_(get_supp_extra) ( const Supp* su );
/* Must be used in VG_(recognised_suppression)() */
void VG_(set_supp_kind) ( Supp* su, SuppKind suppkind );
/* May be used in VG_(read_extra_suppression_info)() */
void VG_(set_supp_string) ( Supp* su, HChar* string );
void VG_(set_supp_extra) ( Supp* su, void* extra );
/*--- end ---*/