511 lines
20 KiB
C++
511 lines
20 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2018 Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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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, see <http://www.gnu.org/licenses/>.
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*/
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//---------------------------------------------------------------------------
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#include "ctu.h"
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#include "astutils.h"
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#include "symboldatabase.h"
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#include <tinyxml2.h>
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//---------------------------------------------------------------------------
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static const char ATTR_CALL_ID[] = "call-id";
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static const char ATTR_CALL_FUNCNAME[] = "call-funcname";
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static const char ATTR_CALL_ARGNR[] = "call-argnr";
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static const char ATTR_CALL_ARGEXPR[] = "call-argexpr";
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static const char ATTR_CALL_ARGVALUETYPE[] = "call-argvaluetype";
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static const char ATTR_CALL_ARGVALUE[] = "call-argvalue";
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static const char ATTR_WARNING[] = "warning";
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static const char ATTR_LOC_FILENAME[] = "filename";
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static const char ATTR_LOC_LINENR[] = "linenr";
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static const char ATTR_INFO[] = "info";
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static const char ATTR_MY_ID[] = "my-id";
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static const char ATTR_MY_ARGNR[] = "my-argnr";
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static const char ATTR_MY_ARGNAME[] = "my-argname";
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std::string CTU::getFunctionId(const Tokenizer *tokenizer, const Function *function)
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{
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return tokenizer->list.file(function->tokenDef) + ':' + MathLib::toString(function->tokenDef->linenr());
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}
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CTU::FileInfo::Location::Location(const Tokenizer *tokenizer, const Token *tok)
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{
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fileName = tokenizer->list.file(tok);
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linenr = tok->linenr();
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}
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std::string CTU::FileInfo::toString() const
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{
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std::ostringstream out;
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// Function calls..
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for (const CTU::FileInfo::FunctionCall &functionCall : functionCalls) {
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out << functionCall.toXmlString();
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}
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// Nested calls..
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for (const CTU::FileInfo::NestedCall &nestedCall : nestedCalls) {
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out << nestedCall.toXmlString() << "\n";
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}
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return out.str();
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}
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std::string CTU::FileInfo::CallBase::toBaseXmlString() const
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{
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std::ostringstream out;
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out << " " << ATTR_CALL_ID << "=\"" << callId << "\""
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<< " " << ATTR_CALL_FUNCNAME << "=\"" << callFunctionName << "\""
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<< " " << ATTR_CALL_ARGNR << "=\"" << callArgNr << "\""
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<< " " << ATTR_LOC_FILENAME << "=\"" << location.fileName << "\""
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<< " " << ATTR_LOC_LINENR << "=\"" << location.linenr << "\"";
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return out.str();
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}
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std::string CTU::FileInfo::FunctionCall::toXmlString() const
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{
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std::ostringstream out;
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out << "<function-call"
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<< toBaseXmlString()
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<< " " << ATTR_CALL_ARGEXPR << "=\"" << callArgumentExpression << "\""
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<< " " << ATTR_CALL_ARGVALUETYPE << "=\"" << callValueType << "\""
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<< " " << ATTR_CALL_ARGVALUE << "=\"" << callArgValue << "\"";
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if (warning)
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out << " " << ATTR_WARNING << "=\"true\"";
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if (callValuePath.empty())
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out << "/>";
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else {
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out << ">\n";
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for (const ErrorLogger::ErrorMessage::FileLocation &loc : callValuePath)
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out << " <path"
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<< " " << ATTR_LOC_FILENAME << "=\"" << loc.getfile() << "\""
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<< " " << ATTR_LOC_LINENR << "=\"" << loc.line << "\""
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<< " " << ATTR_INFO << "=\"" << loc.getinfo() << "\"/>\n";
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out << "</function-call>";
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}
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return out.str();
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}
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std::string CTU::FileInfo::NestedCall::toXmlString() const
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{
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std::ostringstream out;
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out << "<function-call"
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<< toBaseXmlString()
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<< " " << ATTR_MY_ID << "=\"" << myId << "\""
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<< " " << ATTR_MY_ARGNR << "=\"" << myArgNr << "\""
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<< "/>";
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return out.str();
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}
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std::string CTU::FileInfo::UnsafeUsage::toString() const
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{
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std::ostringstream out;
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out << " <unsafe-usage"
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<< " " << ATTR_MY_ID << "=\"" << myId << '\"'
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<< " " << ATTR_MY_ARGNR << "=\"" << myArgNr << '\"'
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<< " " << ATTR_MY_ARGNAME << "=\"" << myArgumentName << '\"'
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<< " " << ATTR_LOC_FILENAME << "=\"" << location.fileName << '\"'
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<< " " << ATTR_LOC_LINENR << "=\"" << location.linenr << '\"'
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<< "/>\n";
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return out.str();
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}
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std::string CTU::toString(const std::list<CTU::FileInfo::UnsafeUsage> &unsafeUsage)
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{
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std::ostringstream ret;
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for (const CTU::FileInfo::UnsafeUsage &u : unsafeUsage)
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ret << u.toString();
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return ret.str();
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}
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CTU::FileInfo::CallBase::CallBase(const Tokenizer *tokenizer, const Token *callToken)
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: callId(getFunctionId(tokenizer, callToken->function()))
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, callArgNr(0)
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, callFunctionName(callToken->next()->astOperand1()->expressionString())
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, location(CTU::FileInfo::Location(tokenizer, callToken))
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{
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}
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CTU::FileInfo::NestedCall::NestedCall(const Tokenizer *tokenizer, const Function *myFunction, const Token *callToken)
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: CallBase(tokenizer, callToken)
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, myId(getFunctionId(tokenizer, myFunction))
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, myArgNr(0)
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{
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}
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static std::string readAttrString(const tinyxml2::XMLElement *e, const char *attr, bool *error)
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{
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const char *value = e->Attribute(attr);
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if (!value && error)
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*error = true;
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return value ? value : "";
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}
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static long long readAttrInt(const tinyxml2::XMLElement *e, const char *attr, bool *error)
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{
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const char *value = e->Attribute(attr);
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if (!value && error)
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*error = true;
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return value ? std::atoi(value) : 0;
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}
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bool CTU::FileInfo::CallBase::loadBaseFromXml(const tinyxml2::XMLElement *e)
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{
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bool error = false;
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callId = readAttrString(e, ATTR_CALL_ID, &error);
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callFunctionName = readAttrString(e, ATTR_CALL_FUNCNAME, &error);
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callArgNr = readAttrInt(e, ATTR_CALL_ARGNR, &error);
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location.fileName = readAttrString(e, ATTR_LOC_FILENAME, &error);
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location.linenr = readAttrInt(e, ATTR_LOC_LINENR, &error);
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return !error;
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}
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bool CTU::FileInfo::FunctionCall::loadFromXml(const tinyxml2::XMLElement *e)
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{
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if (!loadBaseFromXml(e))
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return false;
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bool error=false;
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callArgumentExpression = readAttrString(e, ATTR_CALL_ARGEXPR, &error);
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callValueType = (ValueFlow::Value::ValueType)readAttrInt(e, ATTR_CALL_ARGVALUETYPE, &error);
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callArgValue = readAttrInt(e, ATTR_CALL_ARGVALUE, &error);
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const char *w = e->Attribute(ATTR_WARNING);
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warning = w && std::strcmp(w, "true") == 0;
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for (const tinyxml2::XMLElement *e2 = e->FirstChildElement(); !error && e2; e2 = e2->NextSiblingElement()) {
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if (std::strcmp(e2->Name(), "path") != 0)
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continue;
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ErrorLogger::ErrorMessage::FileLocation loc;
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loc.setfile(readAttrString(e2, ATTR_LOC_FILENAME, &error));
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loc.line = readAttrInt(e2, ATTR_LOC_LINENR, &error);
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loc.setinfo(readAttrString(e2, ATTR_INFO, &error));
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}
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return !error;
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}
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bool CTU::FileInfo::NestedCall::loadFromXml(const tinyxml2::XMLElement *e)
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{
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if (!loadBaseFromXml(e))
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return false;
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bool error = false;
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myId = readAttrString(e, ATTR_MY_ID, &error);
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myArgNr = readAttrInt(e, ATTR_MY_ARGNR, &error);
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return !error;
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}
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void CTU::FileInfo::loadFromXml(const tinyxml2::XMLElement *xmlElement)
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{
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for (const tinyxml2::XMLElement *e = xmlElement->FirstChildElement(); e; e = e->NextSiblingElement()) {
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if (std::strcmp(e->Name(), "function-call") == 0) {
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FunctionCall functionCall;
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if (functionCall.loadFromXml(e))
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functionCalls.push_back(functionCall);
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} else if (std::strcmp(e->Name(), "nested-call") == 0) {
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NestedCall nestedCall;
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if (nestedCall.loadFromXml(e))
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nestedCalls.push_back(nestedCall);
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}
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}
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}
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std::map<std::string, std::list<const CTU::FileInfo::CallBase *>> CTU::FileInfo::getCallsMap() const
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{
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std::map<std::string, std::list<const CTU::FileInfo::CallBase *>> ret;
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for (const CTU::FileInfo::NestedCall &nc : nestedCalls)
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ret[nc.callId].push_back(&nc);
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for (const CTU::FileInfo::FunctionCall &fc : functionCalls)
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ret[fc.callId].push_back(&fc);
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return ret;
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}
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std::list<CTU::FileInfo::UnsafeUsage> CTU::loadUnsafeUsageListFromXml(const tinyxml2::XMLElement *xmlElement)
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{
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std::list<CTU::FileInfo::UnsafeUsage> ret;
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for (const tinyxml2::XMLElement *e = xmlElement->FirstChildElement(); e; e = e->NextSiblingElement()) {
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if (std::strcmp(e->Name(), "unsafe-usage") != 0)
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continue;
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bool error = false;
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FileInfo::UnsafeUsage unsafeUsage;
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unsafeUsage.myId = readAttrString(e, ATTR_MY_ID, &error);
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unsafeUsage.myArgNr = readAttrInt(e, ATTR_MY_ARGNR, &error);
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unsafeUsage.myArgumentName = readAttrString(e, ATTR_MY_ARGNAME, &error);
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unsafeUsage.location.fileName = readAttrString(e, ATTR_LOC_FILENAME, &error);
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unsafeUsage.location.linenr = readAttrInt(e, ATTR_LOC_LINENR, &error);
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if (!error)
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ret.push_back(unsafeUsage);
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}
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return ret;
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}
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static int isCallFunction(const Scope *scope, int argnr, const Token **tok)
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{
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const Variable * const argvar = scope->function->getArgumentVar(argnr);
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if (!argvar->isPointer())
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return -1;
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for (const Token *tok2 = scope->bodyStart; tok2 != scope->bodyEnd; tok2 = tok2->next()) {
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if (tok2->variable() != argvar)
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continue;
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if (!Token::Match(tok2->previous(), "[(,] %var% [,)]"))
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break;
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int argnr2 = 1;
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const Token *prev = tok2;
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while (prev && prev->str() != "(") {
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if (Token::Match(prev,"]|)"))
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prev = prev->link();
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else if (prev->str() == ",")
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++argnr2;
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prev = prev->previous();
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}
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if (!prev || !Token::Match(prev->previous(), "%name% ("))
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break;
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if (!prev->astOperand1() || !prev->astOperand1()->function())
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break;
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*tok = prev->previous();
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return argnr2;
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}
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return -1;
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}
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CTU::FileInfo *CTU::getFileInfo(const Tokenizer *tokenizer)
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{
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const SymbolDatabase * const symbolDatabase = tokenizer->getSymbolDatabase();
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FileInfo *fileInfo = new FileInfo;
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// Parse all functions in TU
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for (const Scope &scope : symbolDatabase->scopeList) {
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if (!scope.isExecutable() || scope.type != Scope::eFunction || !scope.function)
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continue;
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const Function *const function = scope.function;
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// source function calls
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for (const Token *tok = scope.bodyStart; tok != scope.bodyEnd; tok = tok->next()) {
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if (tok->str() != "(" || !tok->astOperand1() || !tok->astOperand2())
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continue;
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if (!tok->astOperand1()->function())
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continue;
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const std::vector<const Token *> args(getArguments(tok->previous()));
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for (int argnr = 0; argnr < args.size(); ++argnr) {
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const Token *argtok = args[argnr];
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if (!argtok)
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continue;
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for (const ValueFlow::Value &value : argtok->values()) {
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if (!value.isIntValue() || value.intvalue != 0 || value.isInconclusive())
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continue;
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struct FileInfo::FunctionCall functionCall;
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functionCall.callValueType = ValueFlow::Value::INT;
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functionCall.callId = getFunctionId(tokenizer, tok->astOperand1()->function());
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functionCall.callFunctionName = tok->astOperand1()->expressionString();
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functionCall.location.fileName = tokenizer->list.file(tok);
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functionCall.location.linenr = tok->linenr();
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functionCall.callArgNr = argnr + 1;
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functionCall.callArgumentExpression = argtok->expressionString();
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functionCall.callArgValue = value.intvalue;
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functionCall.warning = (value.condition != nullptr);
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for (const ErrorPathItem &i : value.errorPath) {
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ErrorLogger::ErrorMessage::FileLocation loc;
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loc.setfile(tokenizer->list.file(i.first));
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loc.line = i.first->linenr();
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loc.setinfo(i.second);
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functionCall.callValuePath.push_back(loc);
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}
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fileInfo->functionCalls.push_back(functionCall);
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}
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// pointer to uninitialized data..
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if (!argtok->isUnaryOp("&"))
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continue;
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argtok = argtok->astOperand1();
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if (!argtok || !argtok->valueType() || argtok->valueType()->pointer != 0)
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continue;
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if (argtok->values().size() != 1U)
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continue;
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const ValueFlow::Value &v = argtok->values().front();
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if (v.valueType == ValueFlow::Value::UNINIT && !v.isInconclusive()) {
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struct FileInfo::FunctionCall functionCall;
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functionCall.callValueType = ValueFlow::Value::UNINIT;
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functionCall.callId = getFunctionId(tokenizer, tok->astOperand1()->function());
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functionCall.callFunctionName = tok->astOperand1()->expressionString();
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functionCall.location.fileName = tokenizer->list.file(tok);
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functionCall.location.linenr = tok->linenr();
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functionCall.callArgNr = argnr + 1;
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functionCall.callArgValue = 0;
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functionCall.callArgumentExpression = argtok->expressionString();
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functionCall.warning = false;
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fileInfo->functionCalls.push_back(functionCall);
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continue;
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}
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}
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}
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// Nested function calls
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for (int argnr = 0; argnr < function->argCount(); ++argnr) {
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const Token *tok;
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int argnr2 = isCallFunction(&scope, argnr, &tok);
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if (argnr2 > 0) {
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FileInfo::NestedCall nestedCall(tokenizer, function, tok);
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nestedCall.myArgNr = argnr + 1;
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nestedCall.callArgNr = argnr2;
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fileInfo->nestedCalls.push_back(nestedCall);
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}
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}
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}
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return fileInfo;
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}
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static bool isUnsafeFunction(const Tokenizer *tokenizer, const Settings *settings, const Scope *scope, int argnr, const Token **tok, const Check *check, bool (*isUnsafeUsage)(const Check *check, const Token *argtok))
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{
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const Variable * const argvar = scope->function->getArgumentVar(argnr);
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if (!argvar->isPointer())
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return false;
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for (const Token *tok2 = scope->bodyStart; tok2 != scope->bodyEnd; tok2 = tok2->next()) {
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if (Token::simpleMatch(tok2, ") {")) {
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tok2 = tok2->linkAt(1);
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if (Token::findmatch(tok2->link(), "return|throw", tok2))
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return false;
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if (isVariableChanged(tok2->link(), tok2, argvar->declarationId(), false, settings, tokenizer->isCPP()))
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return false;
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}
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if (tok2->variable() != argvar)
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continue;
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if (!isUnsafeUsage(check, tok2))
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return false;
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*tok = tok2;
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return true;
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}
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return false;
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}
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std::list<CTU::FileInfo::UnsafeUsage> CTU::getUnsafeUsage(const Tokenizer *tokenizer, const Settings *settings, const Check *check, bool (*isUnsafeUsage)(const Check *check, const Token *argtok))
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{
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std::list<CTU::FileInfo::UnsafeUsage> unsafeUsage;
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// Parse all functions in TU
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const SymbolDatabase * const symbolDatabase = tokenizer->getSymbolDatabase();
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for (const Scope &scope : symbolDatabase->scopeList) {
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if (!scope.isExecutable() || scope.type != Scope::eFunction || !scope.function)
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continue;
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const Function *const function = scope.function;
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// "Unsafe" functions unconditionally reads data before it is written..
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for (int argnr = 0; argnr < function->argCount(); ++argnr) {
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const Token *tok;
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if (isUnsafeFunction(tokenizer, settings, &scope, argnr, &tok, check, isUnsafeUsage))
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unsafeUsage.push_back(CTU::FileInfo::UnsafeUsage(CTU::getFunctionId(tokenizer, function), argnr+1, tok->str(), CTU::FileInfo::Location(tokenizer,tok)));
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}
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}
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return unsafeUsage;
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}
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static bool findPath(const std::string &callId,
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unsigned int callArgNr,
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CTU::FileInfo::InvalidValueType invalidValue,
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const std::map<std::string, std::list<const CTU::FileInfo::CallBase *>> &callsMap,
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const CTU::FileInfo::CallBase *path[10],
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int index,
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bool warning)
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{
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if (index >= 10)
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return false;
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const std::map<std::string, std::list<const CTU::FileInfo::CallBase *>>::const_iterator it = callsMap.find(callId);
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if (it == callsMap.end())
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return false;
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for (const CTU::FileInfo::CallBase *c : it->second) {
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if (c->callArgNr != callArgNr)
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continue;
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const CTU::FileInfo::FunctionCall *functionCall = dynamic_cast<const CTU::FileInfo::FunctionCall *>(c);
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if (functionCall) {
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if (!warning && functionCall->warning)
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continue;
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switch (invalidValue) {
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case CTU::FileInfo::InvalidValueType::null:
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if (functionCall->callValueType != ValueFlow::Value::INT || functionCall->callArgValue != 0)
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continue;
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break;
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case CTU::FileInfo::InvalidValueType::uninit:
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if (functionCall->callValueType != ValueFlow::Value::UNINIT)
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continue;
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break;
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|
};
|
|
path[index] = functionCall;
|
|
return true;
|
|
}
|
|
|
|
const CTU::FileInfo::NestedCall *nestedCall = dynamic_cast<const CTU::FileInfo::NestedCall *>(c);
|
|
if (!nestedCall)
|
|
continue;
|
|
|
|
if (findPath(nestedCall->myId, nestedCall->myArgNr, invalidValue, callsMap, path, index + 1, warning)) {
|
|
path[index] = nestedCall;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
std::list<ErrorLogger::ErrorMessage::FileLocation> CTU::FileInfo::getErrorPath(InvalidValueType invalidValue,
|
|
const CTU::FileInfo::UnsafeUsage &unsafeUsage,
|
|
const std::map<std::string, std::list<const CTU::FileInfo::CallBase *>> &callsMap,
|
|
const char info[],
|
|
const FunctionCall * * const functionCallPtr,
|
|
bool warning) const
|
|
{
|
|
std::list<ErrorLogger::ErrorMessage::FileLocation> locationList;
|
|
|
|
const CTU::FileInfo::CallBase *path[10] = {0};
|
|
|
|
if (!findPath(unsafeUsage.myId, unsafeUsage.myArgNr, invalidValue, callsMap, path, 0, warning))
|
|
return locationList;
|
|
|
|
const std::string value1 = (invalidValue == InvalidValueType::null) ? "null" : "uninitialized";
|
|
|
|
for (int index = 9; index >= 0; index--) {
|
|
if (!path[index])
|
|
continue;
|
|
|
|
const CTU::FileInfo::FunctionCall *functionCall = dynamic_cast<const CTU::FileInfo::FunctionCall *>(path[index]);
|
|
|
|
if (functionCall) {
|
|
if (functionCallPtr)
|
|
*functionCallPtr = functionCall;
|
|
for (const ErrorLogger::ErrorMessage::FileLocation &loc : functionCall->callValuePath)
|
|
locationList.push_back(loc);
|
|
}
|
|
|
|
ErrorLogger::ErrorMessage::FileLocation fileLoc;
|
|
fileLoc.setfile(path[index]->location.fileName);
|
|
fileLoc.line = path[index]->location.linenr;
|
|
fileLoc.setinfo("Calling function " + path[index]->callFunctionName + ", " + MathLib::toString(path[index]->callArgNr) + getOrdinalText(path[index]->callArgNr) + " argument is " + value1);
|
|
locationList.push_back(fileLoc);
|
|
}
|
|
|
|
ErrorLogger::ErrorMessage::FileLocation fileLoc2;
|
|
fileLoc2.setfile(unsafeUsage.location.fileName);
|
|
fileLoc2.line = unsafeUsage.location.linenr;
|
|
fileLoc2.setinfo(replaceStr(info, "ARG", unsafeUsage.myArgumentName));
|
|
locationList.push_back(fileLoc2);
|
|
|
|
return locationList;
|
|
}
|