307 lines
10 KiB
C++
307 lines
10 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2013 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(valueFlowBeforeCondition);
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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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settings.valueFlow = true; // temporary flag
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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.valueFlow = true; // temporary flag
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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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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(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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// assignment
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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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// guarding by &&
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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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// function calls
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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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// while, for, do-while
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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(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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// bailout: ?:
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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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// skip sizeof
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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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// bailout: if/else/etc
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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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// 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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// 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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// 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 valueFlowForLoop() {
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const char *code;
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code = "void f() {\n"
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" for (int x = 0; x < 10; x++)\n"
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" a[x] = 0;\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 3U, 0));
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ASSERT_EQUALS(true, testValueOfX(code, 3U, 9));
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ASSERT_EQUALS(false, testValueOfX(code, 3U, 10));
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code = "void f() {\n"
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" for (int x = 0; x < ((short)10); x++)\n"
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" a[x] = 0;\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 3U, 0));
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ASSERT_EQUALS(true, testValueOfX(code, 3U, 9));
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ASSERT_EQUALS(false, testValueOfX(code, 3U, 10));
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}
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void valueFlowSubFunction() {
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const char *code;
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code = "void f1(int x) { return x; }\n"
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"void f2(int x) {\n"
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" f1(123);\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 1U, 123));
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code = "void f1(int x) { return x; }\n"
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"void f2(int x) {\n"
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" f1(x);\n"
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" if (x==0){}\n"
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"}";
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ASSERT_EQUALS(true, testValueOfX(code, 1U, 0));
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code = "void f1(int x) {\n"
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" if (x == 0) return;\n"
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" int y = 1234 / x;\n"
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"}\n"
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"\n"
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"void f2() {\n"
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" f1(0);\n"
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"}";
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ASSERT_EQUALS(false, testValueOfX(code, 3U, 0));
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code = "void f1(int x) { a=x; }\n"
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"void f2(int y) { f1(y<123); }\n";
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ASSERT_EQUALS(true, testValueOfX(code, 1U, 0));
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ASSERT_EQUALS(true, testValueOfX(code, 1U, 1));
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code = "void f1(int x) { a=(abc)x; }\n"
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"void f2(int y) { f1(123); }\n";
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ASSERT_EQUALS(true, testValueOfX(code, 1U, 123));
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}
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};
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REGISTER_TEST(TestValueFlow)
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