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/*
* Copyright (C) 2015 Andrei Karas
*
* This file is part of AstDumper.
*
* 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 3 of the License, or
* 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "analysis/expression.h"
#include "command.h"
#include "logger.h"
#include "analysis/analysis.h"
#include "analysis/walkitem.h"
#include "nodes/expr/addr_expr.h"
#include "nodes/expr/modify_expr.h"
#include "nodes/expr/ne_expr.h"
#include "nodes/expr/pointerplus_expr.h"
#include "nodes/expr/return_expr.h"
#include "nodes/ref/indirect_ref.h"
#include <set>
#include "localconsts.h"
namespace Analysis
{
void analyseModifyExpr(ModifyExprNode *node, const WalkItem &wi, WalkItem &wo)
{
// need atleast one arg for check
if (node->args.empty() || command == FindArgs)
return;
Node *arg = skipNop(node->args[0]);
if (arg && arg->nodeType == INDIRECT_REF)
{
reportParmDeclNullPointer(node,
static_cast<IndirectRefNode*>(arg)->ref,
wi);
}
}
void analysePointerPlusExpr(PointerPlusExprNode *node, const WalkItem &wi, WalkItem &wo)
{
// need atleast one arg for check
if (node->args.empty() || command == FindArgs)
return;
reportParmDeclNullPointer(node, node->args[0], wi);
}
void analyseAddrExpr(AddrExprNode *node, const WalkItem &wi, WalkItem &wo)
{
// need atleast one arg for check
if (node->args.empty() || command == FindArgs)
return;
reportParmDeclNullPointer(node, node->args[0], wi);
}
void analyseReturnExpr(ReturnExprNode *node, const WalkItem &wi, WalkItem &wo)
{
wo.isReturned = true;
}
void analyseNeExpr(NeExprNode *node, const WalkItem &wi, WalkItem &wo)
{
// need atleast one arg for check
if (node->args.size() < 2 || !wi.isExpr || command == FindArgs)
return;
// PARM_DECL?
Node *node1 = skipNop(node->args[0]);
// INTEGER_CST?
Node *node2 = skipNop(node->args[1]);
// if (var != 0)
if (node1 &&
node2 &&
node1->nodeType == PARM_DECL &&
node2->nodeType == INTEGER_CST &&
wi.checkNullVars.find(node1->label) != wi.checkNullVars.end() &&
node2->label == "0")
{
wo.removeNullVars.insert(node1->label);
wo.checkNullVars.erase(node1->label);
}
}
}
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