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/*--- begin ir_match.c ---*/
This file is part of Valgrind, a dynamic binary instrumentation
Copyright (C) 2004-2013 OpenWorks LLP
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., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
The GNU General Public License is contained in the file COPYING.
Neither the names of the U.S. Department of Energy nor the
University of California nor the names of its contributors may be
used to endorse or promote products derived from this software
without prior written permission.
/* Provides a facility for doing IR tree matching. */
#include "main_util.h"
#include "ir_match.h"
/* Assign a value to a binder. Checks for obvious stupidities. */
void setBindee ( MatchInfo* mi, Int n, IRExpr* bindee )
if (n < 0 || n >= N_IRMATCH_BINDERS)
vpanic("setBindee: out of range index");
if (mi->bindee[n] != NULL)
vpanic("setBindee: bindee already set");
mi->bindee[n] = bindee;
/* This is the actual matching function, recursing over the pattern
and expression trees in the obvious way, and dumping any matches
found into 'mi'. */
Bool matchWrk ( MatchInfo* mi, IRExpr* p/*attern*/, IRExpr* e/*xpr*/ )
switch (p->tag) {
case Iex_Binder: /* aha, what we were looking for. */
setBindee(mi, p->Iex.Binder.binder, e);
return True;
case Iex_Unop:
if (e->tag != Iex_Unop) return False;
if (p->Iex.Unop.op != e->Iex.Unop.op) return False;
if (!matchWrk(mi, p->Iex.Unop.arg, e->Iex.Unop.arg))
return False;
return True;
case Iex_Binop:
if (e->tag != Iex_Binop) return False;
if (p->Iex.Binop.op != e->Iex.Binop.op) return False;
if (!matchWrk(mi, p->Iex.Binop.arg1, e->Iex.Binop.arg1))
return False;
if (!matchWrk(mi, p->Iex.Binop.arg2, e->Iex.Binop.arg2))
return False;
return True;
case Iex_Load:
if (e->tag != Iex_Load) return False;
if (p->Iex.Load.end != e->Iex.Load.end) return False;
if (p->Iex.Load.ty != e->Iex.Load.ty) return False;
if (!matchWrk(mi, p->Iex.Load.addr, e->Iex.Load.addr))
return False;
return True;
case Iex_Const:
if (e->tag != Iex_Const) return False;
return eqIRConst(p->Iex.Const.con, e->Iex.Const.con);
/* Top level entry point to the matcher. */
Bool matchIRExpr ( MatchInfo* mi, IRExpr* p/*attern*/, IRExpr* e/*xpr*/ )
Int i;
for (i = 0; i < N_IRMATCH_BINDERS; i++)
mi->bindee[i] = NULL;
return matchWrk(mi, p, e);
/*--- end ir_match.c ---*/