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/*--- A simple sequence matching facility. ---*/
/*--- pub_tool_seqmatch.h ---*/
This file is part of Valgrind, a dynamic binary instrumentation
Copyright (C) 2008-2013 OpenWorks Ltd
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_basics.h" // UWord
/* Perform totally abstractified sequence matching, of an input
sequence against a pattern sequence. The pattern sequence may
include '*' elements (matches any number of anything) and '?'
elements (matches exactly one element). '*' patterns are matched
frugally, meaning that they are "assigned" the minimum amount of
input needed to make the match work.
This routine is recursive. The recursion depth is equal to the
number of '*' elements in the pattern. There is no guard against
excessive recursion. This function has no global state and so is
thread-safe and re-entrant. (It needs to be, since m_errormgr will
effectively construct two simultaneous calls to it, once to match
at the frame level, and whilst that is happening, once at the
function/object-name level.)
When matchAll is True, the entire input sequence must match the
pattern, else the match fails. When False, it's ok for some tail
of the input sequence to be unused -- so we're only matching a
The pattern array is starts at 'patt' and consists of 'nPatt'
elements each of size 'szbPatt'. For the initial call, pass a
value of zero to 'ixPatt'.
The input sequence can be similarly described using
Alternatively, the input can be lazily constructed using an
inputCompleter. When using an inputCompleter, input/nInput/szbInput
are unused.
pIsStar should return True iff the pointed-to pattern element is
conceptually a '*'.
pIsQuery should return True iff the pointed-to-pattern element is
conceptually a '?'.
pattEQinp takes a pointer to a pattern element and a pointer to an
input element. It should return True iff they are considered
equal. Note that the pattern element is guaranteed to be neither
(conceptually) '*' nor '?', so it must be a literal (in the sense
that all the input sequence elements are literal).
If inputCompleter is not NULL, the input will be lazily constructed
when pattEQinp is called.
For lazily constructing the input element, the two last arguments
of pattEQinp are the inputCompleter and the index of the input
element to complete.
VG_(generic_match) calls (*haveInputInpC)(inputCompleter,ixInput) to
check if there is an element ixInput in the input sequence.
Bool VG_(generic_match) (
Bool matchAll,
const void* patt, SizeT szbPatt, UWord nPatt, UWord ixPatt,
const void* input, SizeT szbInput, UWord nInput, UWord ixInput,
Bool (*pIsStar)(const void*),
Bool (*pIsQuery)(const void*),
Bool (*pattEQinp)(const void*,const void*,void*,UWord),
void* inputCompleter,
Bool (*haveInputInpC)(void*,UWord)
/* Mini-regexp function. Searches for 'pat' in 'str'. Supports
meta-symbols '*' and '?'. There is no way to escape meta-symbols
in the pattern. */
Bool VG_(string_match) ( const HChar* pat, const HChar* str );
/*--- end pub_tool_seqmatch.h ---*/