647 lines
22 KiB
C++
647 lines
22 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2014 Daniel Marjamäki and 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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#include "testsuite.h"
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#include "testutils.h"
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#include "valueflow.h"
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#include "tokenize.h"
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#include "token.h"
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#include <vector>
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#include <string>
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extern std::ostringstream errout;
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class TestValueFlow : public TestFixture {
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public:
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TestValueFlow() : TestFixture("TestValueFlow") {
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}
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private:
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void run() {
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TEST_CASE(valueFlowNumber);
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TEST_CASE(valueFlowCalculations);
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TEST_CASE(valueFlowBeforeCondition);
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TEST_CASE(valueFlowBeforeConditionAndAndOrOrGuard);
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TEST_CASE(valueFlowBeforeConditionAssignIncDec);
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TEST_CASE(valueFlowBeforeConditionFunctionCall);
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TEST_CASE(valueFlowBeforeConditionGlobalVariables);
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TEST_CASE(valueFlowBeforeConditionGoto);
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TEST_CASE(valueFlowBeforeConditionIfElse);
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TEST_CASE(valueFlowBeforeConditionLoop);
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TEST_CASE(valueFlowBeforeConditionMacro);
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TEST_CASE(valueFlowBeforeConditionSizeof);
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TEST_CASE(valueFlowBeforeConditionSwitch);
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TEST_CASE(valueFlowBeforeConditionTernaryOp);
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TEST_CASE(valueFlowAfterAssign);
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TEST_CASE(valueFlowForLoop);
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TEST_CASE(valueFlowSubFunction);
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}
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bool testValueOfX(const std::string &code, unsigned int linenr, int value) {
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Settings settings;
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// strcpy cfg
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const char cfg[] = "<?xml version=\"1.0\"?>\n"
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"<def>\n"
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" <function name=\"strcpy\"> <arg nr=\"1\"><not-null/></arg> </function>\n"
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"</def>";
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settings.library.loadxmldata(cfg, sizeof(cfg));
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// Tokenize..
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Tokenizer tokenizer(&settings, this);
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std::istringstream istr(code);
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tokenizer.tokenize(istr, "test.cpp");
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for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {
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if (tok->str() == "x" && tok->linenr() == linenr) {
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std::list<ValueFlow::Value>::const_iterator it;
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for (it = tok->values.begin(); it != tok->values.end(); ++it) {
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if (it->intvalue == value)
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return true;
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}
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}
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}
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return false;
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}
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void bailout(const char code[]) {
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Settings settings;
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settings.debugwarnings = true;
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// Tokenize..
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Tokenizer tokenizer(&settings, this);
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std::istringstream istr(code);
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errout.str("");
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tokenizer.tokenize(istr, "test.cpp");
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}
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std::list<ValueFlow::Value> tokenValues(const char code[], const char tokstr[]) {
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const Settings settings;
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Tokenizer tokenizer(&settings, this);
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std::istringstream istr(code);
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errout.str("");
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tokenizer.tokenize(istr, "test.cpp");
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const Token *tok = Token::findmatch(tokenizer.tokens(), tokstr);
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return tok ? tok->values : std::list<ValueFlow::Value>();
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}
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ValueFlow::Value valueOfTok(const char code[], const char tokstr[]) {
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std::list<ValueFlow::Value> values = tokenValues(code, tokstr);
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return values.size() == 1U ? values.front() : ValueFlow::Value();
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}
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void valueFlowNumber() {
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const char *code;
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code = "void f() {\n"
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" x = 123;\n"
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"}";
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ASSERT_EQUALS(123, valueOfTok(code, "123").intvalue);
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}
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void valueFlowCalculations() {
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const char *code;
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/*
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code = "void f() {\n"
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" x = 123+456;\n"
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"}";
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ASSERT_EQUALS(579, valueOfTok(code, "+").intvalue);
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*/
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code = "void f(int x) {\n"
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" a = x+456;\n"
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" if (x==123) {}"
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"}";
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ASSERT_EQUALS(579, valueOfTok(code, "+").intvalue);
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code = "void f(int x, int y) {\n"
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" a = x+y;\n"
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" if (x==123 || y==456) {}"
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"}";
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ASSERT_EQUALS(0, valueOfTok(code, "+").intvalue);
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code = "void f(int x) {\n"
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" a = x+x;\n"
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" if (x==123) {}"
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"}";
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ASSERT_EQUALS(246, valueOfTok(code, "+").intvalue);
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code = "void f(int x, int y) {\n"
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" a = x*x;\n"
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" if (x==2) {}\n"
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" if (x==4) {}\n"
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"}";
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std::list<ValueFlow::Value> values = tokenValues(code,"*");
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ASSERT_EQUALS(2U, values.size());
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ASSERT_EQUALS(4, values.front().intvalue);
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ASSERT_EQUALS(16, values.back().intvalue);
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}
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void valueFlowBeforeCondition() {
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const char *code;
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code = "void f(int x) {\n"
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" int a = x;\n"
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" if (x == 123) {}\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 2U, 123));
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code = "void f(unsigned int x) {\n"
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" int a = x;\n"
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" if (x >= 1) {}\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 2U, 1));
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ASSERT_EQUALS(true, testValueOfX(code, 2U, 0));
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code = "void f(unsigned int x) {\n"
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" int a = x;\n"
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" if (x > 0) {}\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 2U, 0));
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code = "void f(unsigned int x) {\n"
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" int a = x;\n"
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" if (x > 1) {}\n" // not zero => don't consider > condition
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"}";
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ASSERT_EQUALS(false, testValueOfX(code, 2U, 1));
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code = "void f(int x) {\n" // not unsigned => don't consider > condition
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" int a = x;\n"
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" if (x > 0) {}\n"
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"}";
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ASSERT_EQUALS(false, testValueOfX(code, 2U, 0));
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code = "void f(int *x) {\n"
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" *x = 100;\n"
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" if (x) {}\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 2U, 0));
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code = "extern const int x;\n"
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"void f() {\n"
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" int a = x;\n"
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" if (x == 123) {}\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 3U, 123));
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}
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void valueFlowBeforeConditionAssignIncDec() { // assignment / increment
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const char *code;
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code = "void f(int x) {\n"
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" x = 2 + x;\n"
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" if (x == 65);\n"
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"}";
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ASSERT_EQUALS(false, testValueOfX(code, 2U, 65));
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code = "void f(int x) {\n"
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" x = y = 2 + x;\n"
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" if (x == 65);\n"
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"}";
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ASSERT_EQUALS(false, testValueOfX(code, 2U, 65));
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code = "void f(int x) {\n"
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" a[x++] = 0;\n"
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" if (x == 5);\n"
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"}";
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ASSERT_EQUALS(false, testValueOfX(code, 2U, 5));
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code = "void f(int x) {\n"
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" a = x;\n"
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" x++;\n"
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" if (x == 4);\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 2U, 3));
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// bailout: assignment
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bailout("void f(int x) {\n"
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" x = y;\n"
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" if (x == 123) {}\n"
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"}");
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ASSERT_EQUALS("[test.cpp:2]: (debug) ValueFlow bailout: assignment of x\n", errout.str());
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}
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void valueFlowBeforeConditionAndAndOrOrGuard() { // guarding by &&
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const char *code;
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code = "void f(int x) {\n"
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" if (!x || \n" // <- x can be 0
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" a/x) {}\n" // <- x can't be 0
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" if (x==0) {}\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 2U, 0));
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ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
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code = "void f(int *x) {\n"
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" ((x=ret())&&\n"
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" (*x==0));\n" // <- x is not 0
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" if (x==0) {}\n"
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"}";
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ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
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}
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void valueFlowBeforeConditionFunctionCall() { // function calls
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const char *code;
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code = "void f(int x) {\n"
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" a = x;\n"
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" setx(x);\n"
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" if (x == 1) {}\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(std::string("void setx(int x);")+code, 2U, 1));
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ASSERT_EQUALS(false, testValueOfX(std::string("void setx(int &x);")+code, 2U, 1));
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ASSERT_EQUALS(false, testValueOfX(code, 2U, 1));
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code = "void f(char* x) {\n"
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" strcpy(x,\"abc\");\n"
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" if (x) {}\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 2U, 0));
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code = "void addNewFunction(Scope**scope, const Token**tok);\n"
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"void f(Scope *x) {\n"
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" x->functionList.back();\n"
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" addNewFunction(&x,&tok);\n" // address-of, x can be changed by subfunction
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" if (x) {}\n"
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"}";
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ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
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}
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void valueFlowBeforeConditionLoop() { // while, for, do-while
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const char *code;
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code = "void f(int x) {\n" // loop condition, x is not assigned inside loop => use condition
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" a = x;\n" // x can be 37
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" while (x == 37) {}\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 2U, 37));
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code = "void f(int x) {\n" // loop condition, x is assigned inside loop => dont use condition
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" a = x;\n" // don't assume that x can be 37
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" while (x != 37) { x++; }\n"
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"}";
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ASSERT_EQUALS(false, testValueOfX(code, 2U, 37));
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code = "void f(menu *x) {\n"
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" a = x->parent;\n"
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" for (i=0;(i<10) && (x!=0); i++) { x = x->next; }\n"
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"}";
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ASSERT_EQUALS(false, testValueOfX(code, 2U, 0));
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code = "void f(int x) {\n" // condition inside loop, x is NOT assigned inside loop => use condition
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" a = x;\n"
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" do {\n"
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" if (x==76) {}\n"
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" } while (1);\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 2U, 76));
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code = "void f(int x) {\n" // conditions inside loop, x is assigned inside do-while => dont use condition
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" a = x;\n"
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" do {\n"
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" if (x!=76) { x=do_something(); }\n"
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" } while (1);\n"
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"}";
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ASSERT_EQUALS(false, testValueOfX(code, 2U, 76));
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code = "void f(X x) {\n" // conditions inside loop, x is assigned inside do-while => dont use condition
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" a = x;\n"
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" for (i=1;i<=count;i++) {\n"
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" BUGON(x==0)\n"
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" x = x.next;\n"
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" }\n"
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"}";
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ASSERT_EQUALS(false, testValueOfX(code, 2U, 0));
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code = "void f(unsigned int x) {\n"
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" for (int a = 1000 / x;\n"
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" x > 0;\n"
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" x--) {}\n"
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"}";
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ASSERT_EQUALS(false, testValueOfX(code, 2U, 0));
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}
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void valueFlowBeforeConditionTernaryOp() { // bailout: ?:
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const char *code;
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bailout("void f(int x) {\n"
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" y = ((x<0) ? x : ((x==2)?3:4));\n"
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"}");
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ASSERT_EQUALS("[test.cpp:2]: (debug) ValueFlow bailout: no simplification of x within ?: expression\n", errout.str());
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bailout("int f(int x) {\n"
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" int r = x ? 1 / x : 0;\n"
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" if (x == 0) {}\n"
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"}");
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ASSERT_EQUALS("[test.cpp:2]: (debug) ValueFlow bailout: no simplification of x within ?: expression\n", errout.str());
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code = "void f(int x) {\n"
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" int a =v x;\n"
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" a = b ? x/2 : 20/x;\n"
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" if (x == 123) {}\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 2U, 123));
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code = "void f(int x, int y) {\n"
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" a = x;\n"
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" if (y){}\n"
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" if (x==123){}\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 2U, 123));
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}
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void valueFlowBeforeConditionSizeof() { // skip sizeof
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const char *code;
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code = "void f(int *x) {\n"
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" sizeof(x[0]);\n"
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" if (x==63){}\n"
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"}";
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ASSERT_EQUALS(false, testValueOfX(code, 2U, 63));
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}
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void valueFlowBeforeConditionIfElse() { // bailout: if/else/etc
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const char *code;
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code = "void f(X * x) {\n"
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" a = x;\n"
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" if ((x != NULL) &&\n"
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" (a(x->name, html)) &&\n"
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" (a(x->name, body))) {}\n"
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" if (x != NULL) { }\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 2U, 0));
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ASSERT_EQUALS(true, testValueOfX(code, 3U, 0));
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ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
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ASSERT_EQUALS(false, testValueOfX(code, 5U, 0));
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bailout("void f(int x) {\n"
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" if (x != 123) { b = x; }\n"
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" if (x == 123) {}\n"
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"}");
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ASSERT_EQUALS("[test.cpp:2]: (debug) ValueFlow bailout: variable x stopping on }\n", errout.str());
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}
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void valueFlowBeforeConditionGlobalVariables() {
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// bailout: global variables
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bailout("int x;\n"
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"void f() {\n"
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" int a = x;\n"
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" if (x == 123) {}\n"
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"}");
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ASSERT_EQUALS("[test.cpp:4]: (debug) ValueFlow bailout: global variable x\n", errout.str());
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// class variable
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const char *code;
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code = "class Fred { int x; void clear(); void f(); };\n"
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"void Fred::f() {\n"
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" int a = x;\n"
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" clear();\n" // <- x might be assigned
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" if (x == 234) {}\n"
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"}";
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ASSERT_EQUALS(false, testValueOfX(code,3,234));
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}
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void valueFlowBeforeConditionSwitch() {
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// bailout: switch
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// TODO : handle switch/goto more intelligently
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bailout("void f(int x, int y) {\n"
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" switch (y) {\n"
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" case 1: a=x; break;\n"
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" case 2: if (x==5) {} break;\n"
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" };\n"
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"}");
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ASSERT_EQUALS("[test.cpp:3]: (debug) ValueFlow bailout: variable x stopping on break\n", errout.str());
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bailout("void f(int x, int y) {\n"
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" switch (y) {\n"
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" case 1: a=x; return 1;\n"
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" case 2: if (x==5) {} break;\n"
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" };\n"
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"}");
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ASSERT_EQUALS("[test.cpp:3]: (debug) ValueFlow bailout: variable x stopping on return\n", errout.str());
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}
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void valueFlowBeforeConditionMacro() {
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// bailout: condition is a expanded macro
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bailout("void f(int x) {\n"
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" a = x;\n"
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" $if ($x==$123){}\n"
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"}");
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ASSERT_EQUALS("[test.cpp:3]: (debug) ValueFlow bailout: variable x, condition is defined in macro\n", errout.str());
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}
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void valueFlowBeforeConditionGoto() {
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// bailout: goto label (TODO: handle gotos more intelligently)
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bailout("void f(int x) {\n"
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" if (x == 123) { goto out; }\n"
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" a=x;\n" // <- x is not 123
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"out:"
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" if (x==123){}\n"
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"}");
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ASSERT_EQUALS("[test.cpp:3]: (debug) ValueFlow bailout: variable x stopping on goto label\n", errout.str());
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}
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void valueFlowAfterAssign() {
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const char *code;
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code = "void f() {\n"
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" int x = 123;\n"
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" a = x;\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 3U, 123));
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code = "void f() {\n"
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" int x = 123;\n"
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" a = sizeof(x);\n"
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"}";
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ASSERT_EQUALS(false, testValueOfX(code, 3U, 123));
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code = "void f() {\n"
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" int x = 123;\n"
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" a = 2 + x;\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 3U, 123));
|
|
|
|
code = "void f() {\n"
|
|
" int x = 9;\n"
|
|
" --x;\n"
|
|
" return x;\n"
|
|
"}";
|
|
ASSERT_EQUALS(false, testValueOfX(code, 4U, 9));
|
|
|
|
code = "void f() {\n"
|
|
" static int x = 2;\n"
|
|
" x++;\n"
|
|
" return x;\n"
|
|
"}";
|
|
ASSERT_EQUALS(false, testValueOfX(code, 4U, 2));
|
|
|
|
// function
|
|
code = "void f() {\n"
|
|
" char *x = 0;\n"
|
|
" int success = getx((char**)&x);\n"
|
|
" if (success) x[0] = 0;\n"
|
|
"}";
|
|
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
|
|
|
|
// if/else
|
|
code = "void f() {\n"
|
|
" int x = 123;\n"
|
|
" if (condition) return;\n"
|
|
" a = 2 + x;\n"
|
|
"}";
|
|
ASSERT_EQUALS(true, testValueOfX(code, 4U, 123));
|
|
|
|
code = "void f() {\n"
|
|
" int x = 1;\n"
|
|
" if (condition) x = 2;\n"
|
|
" a = 2 + x;\n"
|
|
"}";
|
|
ASSERT_EQUALS(true, testValueOfX(code, 4U, 1));
|
|
|
|
code = "void f() {\n"
|
|
" int x = 123;\n"
|
|
" if (condition1) x = 456;\n"
|
|
" if (condition2) x = 789;\n"
|
|
" a = 2 + x;\n"
|
|
"}";
|
|
ASSERT_EQUALS(false, testValueOfX(code, 4U, 123));
|
|
|
|
code = "void f(int a) {\n"
|
|
" int x = 123;\n"
|
|
" if (a > 1)\n"
|
|
" ++x;\n"
|
|
" else\n"
|
|
" ++x;\n"
|
|
" return 2 + x;\n"
|
|
"}";
|
|
ASSERT_EQUALS(false, testValueOfX(code, 4U, 123));
|
|
|
|
code = "void f() {\n"
|
|
" int x = 1;\n"
|
|
" if (condition1) x = 2;\n"
|
|
" else return;\n"
|
|
" a = 2 + x;\n"
|
|
"}";
|
|
ASSERT_EQUALS(false, testValueOfX(code, 5U, 1));
|
|
|
|
code = "void f(){\n"
|
|
" int x = 0;\n"
|
|
" if (a>=0) { x = getx(); }\n"
|
|
" if (x==0) { return; }\n"
|
|
" return 123 / x;\n"
|
|
"}\n";
|
|
ASSERT_EQUALS(false, testValueOfX(code, 5U, 0));
|
|
|
|
code = "void f() {\n"
|
|
" X *x = getx();\n"
|
|
" if(false) { x = 0; }\n"
|
|
" else { x->y = 1; }\n"
|
|
"}";
|
|
ASSERT_EQUALS(false, testValueOfX(code, 4U, 0));
|
|
|
|
// multivariables
|
|
code = "void f(int a) {\n"
|
|
" int x = a;\n"
|
|
" if (a!=132) { b = x; }\n"
|
|
"}";
|
|
ASSERT_EQUALS(false, testValueOfX(code, 3U, 132));
|
|
|
|
code = "void f(int a) {\n"
|
|
" int x = a;\n"
|
|
" b = x;\n"
|
|
" if (a!=132) {}\n"
|
|
"}";
|
|
ASSERT_EQUALS(true, testValueOfX(code, 3U, 132));
|
|
|
|
code = "void f() {\n"
|
|
" int a;\n"
|
|
" if (n) { a = n; }\n"
|
|
" else { a = 0; }\n"
|
|
" int x = a;\n"
|
|
" if (a > 0) { a = b / x; }\n"
|
|
"}";
|
|
ASSERT_EQUALS(false, testValueOfX(code, 6U, 0));
|
|
}
|
|
|
|
void valueFlowForLoop() {
|
|
const char *code;
|
|
|
|
code = "void f() {\n"
|
|
" for (int x = 0; x < 10; x++)\n"
|
|
" a[x] = 0;\n"
|
|
"}";
|
|
ASSERT_EQUALS(true, testValueOfX(code, 3U, 0));
|
|
ASSERT_EQUALS(true, testValueOfX(code, 3U, 9));
|
|
ASSERT_EQUALS(false, testValueOfX(code, 3U, 10));
|
|
|
|
code = "void f() {\n"
|
|
" for (int x = 0; x < ((short)10); x++)\n"
|
|
" a[x] = 0;\n"
|
|
"}";
|
|
ASSERT_EQUALS(true, testValueOfX(code, 3U, 0));
|
|
ASSERT_EQUALS(true, testValueOfX(code, 3U, 9));
|
|
ASSERT_EQUALS(false, testValueOfX(code, 3U, 10));
|
|
}
|
|
|
|
void valueFlowSubFunction() {
|
|
const char *code;
|
|
|
|
code = "void f1(int x) { return x; }\n"
|
|
"void f2(int x) {\n"
|
|
" f1(123);\n"
|
|
"}";
|
|
ASSERT_EQUALS(true, testValueOfX(code, 1U, 123));
|
|
|
|
code = "void f1(int x) { return x; }\n"
|
|
"void f2(int x) {\n"
|
|
" f1(x);\n"
|
|
" if (x==0){}\n"
|
|
"}";
|
|
ASSERT_EQUALS(true, testValueOfX(code, 1U, 0));
|
|
|
|
code = "void f1(int x) {\n"
|
|
" if (x == 0) return;\n"
|
|
" int y = 1234 / x;\n"
|
|
"}\n"
|
|
"\n"
|
|
"void f2() {\n"
|
|
" f1(0);\n"
|
|
"}";
|
|
ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
|
|
|
|
code = "void f1(int x) { a=x; }\n"
|
|
"void f2(int y) { f1(y<123); }\n";
|
|
ASSERT_EQUALS(true, testValueOfX(code, 1U, 0));
|
|
ASSERT_EQUALS(true, testValueOfX(code, 1U, 1));
|
|
|
|
code = "void f1(int x) { a=(abc)x; }\n"
|
|
"void f2(int y) { f1(123); }\n";
|
|
ASSERT_EQUALS(true, testValueOfX(code, 1U, 123));
|
|
}
|
|
};
|
|
|
|
REGISTER_TEST(TestValueFlow)
|