765 lines
24 KiB
C++
765 lines
24 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 "tokenize.h"
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#include "checkautovariables.h"
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#include "testsuite.h"
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#include <sstream>
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extern std::ostringstream errout;
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class TestAutoVariables : public TestFixture {
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public:
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TestAutoVariables() : TestFixture("TestAutoVariables")
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{ }
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private:
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void check(const char code[], bool inconclusive=false, bool runSimpleChecks=true) {
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// Clear the error buffer..
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errout.str("");
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Settings settings;
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settings.inconclusive = inconclusive;
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settings.addEnabled("warning");
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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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CheckAutoVariables checkAutoVariables(&tokenizer, &settings, this);
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checkAutoVariables.returnReference();
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if (runSimpleChecks) {
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const std::string str1(tokenizer.tokens()->stringifyList(0,true));
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tokenizer.simplifyTokenList();
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const std::string str2(tokenizer.tokens()->stringifyList(0,true));
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if (str1 != str2)
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warn(("Unsimplified code in test case\nstr1="+str1+"\nstr2="+str2).c_str());
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// Check auto variables
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checkAutoVariables.autoVariables();
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checkAutoVariables.returnPointerToLocalArray();
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}
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}
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void run() {
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TEST_CASE(testautovar1);
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TEST_CASE(testautovar2);
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TEST_CASE(testautovar3); // ticket #2925
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TEST_CASE(testautovar4); // ticket #2928
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TEST_CASE(testautovar5); // ticket #2926
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TEST_CASE(testautovar6); // ticket #2931
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TEST_CASE(testautovar7); // ticket #3066
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TEST_CASE(testautovar8);
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TEST_CASE(testautovar9);
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TEST_CASE(testautovar10); // ticket #2930 - void f(char *p) { p = '\0'; }
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TEST_CASE(testautovar_array1);
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TEST_CASE(testautovar_array2);
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TEST_CASE(testautovar_return1);
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TEST_CASE(testautovar_return2);
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TEST_CASE(testautovar_return3);
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TEST_CASE(testautovar_return4); // ticket #3030
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TEST_CASE(testautovar_extern);
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TEST_CASE(testinvaliddealloc);
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TEST_CASE(testassign1); // Ticket #1819
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TEST_CASE(testassign2); // Ticket #2765
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TEST_CASE(returnLocalVariable1);
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TEST_CASE(returnLocalVariable2);
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// return reference..
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TEST_CASE(returnReference1);
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TEST_CASE(returnReference2);
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TEST_CASE(returnReference3);
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TEST_CASE(returnReference4);
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TEST_CASE(returnReference5);
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TEST_CASE(returnReference6);
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TEST_CASE(returnReference7);
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// global namespace
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TEST_CASE(testglobalnamespace);
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TEST_CASE(returnParameterAddress);
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}
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void testautovar1() {
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check("void func1(int **res)\n"
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"{\n"
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" int num = 2;\n"
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" *res = #\n"
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"}");
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ASSERT_EQUALS("[test.cpp:4]: (error) Address of local auto-variable assigned to a function parameter.\n", errout.str());
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check("void func1(int **res)\n"
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"{\n"
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" int num = 2;\n"
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" res = #\n"
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"}");
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ASSERT_EQUALS("[test.cpp:4]: (warning) Assignment of function parameter has no effect outside the function.\n", errout.str());
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check("void func1(int **res)\n"
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"{\n"
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" int num = 2;\n"
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" foo.res = #\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void testautovar2() {
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check("class Fred {\n"
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" void func1(int **res);\n"
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"}\n"
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"void Fred::func1(int **res)\n"
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"{\n"
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" int num = 2;\n"
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" *res = #\n"
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"}");
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ASSERT_EQUALS("[test.cpp:7]: (error) Address of local auto-variable assigned to a function parameter.\n", errout.str());
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check("class Fred {\n"
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" void func1(int **res);\n"
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"}\n"
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"void Fred::func1(int **res)\n"
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"{\n"
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" int num = 2;\n"
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" res = #\n"
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"}");
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ASSERT_EQUALS("[test.cpp:7]: (warning) Assignment of function parameter has no effect outside the function.\n", errout.str());
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check("class Fred {\n"
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" void func1(int **res);\n"
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"}\n"
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"void Fred::func1(int **res)\n"
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"{\n"
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" int num = 2;\n"
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" foo.res = #\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void testautovar3() { // ticket #2925
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check("void foo(int **p)\n"
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"{\n"
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" int x[100];\n"
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" *p = x;\n"
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"}");
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ASSERT_EQUALS("[test.cpp:4]: (error) Address of local auto-variable assigned to a function parameter.\n", errout.str());
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}
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void testautovar4() { // ticket #2928
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check("void foo(int **p)\n"
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"{\n"
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" static int x[100];\n"
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" *p = x;\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void testautovar5() { // ticket #2926
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check("void foo(struct AB *ab)\n"
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"{\n"
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" char a;\n"
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" ab->a = &a;\n"
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"}", false);
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ASSERT_EQUALS("", errout.str());
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check("void foo(struct AB *ab)\n"
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"{\n"
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" char a;\n"
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" ab->a = &a;\n"
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"}", true);
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ASSERT_EQUALS("[test.cpp:4]: (error, inconclusive) Address of local auto-variable assigned to a function parameter.\n", errout.str());
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}
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void testautovar6() { // ticket #2931
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check("void foo(struct X *x)\n"
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"{\n"
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" char a[10];\n"
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" x->str = a;\n"
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"}", false);
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ASSERT_EQUALS("", errout.str());
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check("void foo(struct X *x)\n"
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"{\n"
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" char a[10];\n"
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" x->str = a;\n"
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"}", true);
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ASSERT_EQUALS("[test.cpp:4]: (error, inconclusive) Address of local auto-variable assigned to a function parameter.\n", errout.str());
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}
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void testautovar7() { // ticket #3066
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check("struct txt_scrollpane_s * TXT_NewScrollPane(struct txt_widget_s * target)\n"
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"{\n"
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" struct txt_scrollpane_s * scrollpane;\n"
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" target->parent = &scrollpane->widget;\n"
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" return scrollpane;\n"
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"}", false);
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ASSERT_EQUALS("", errout.str());
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}
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void testautovar8() {
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check("void foo(int*& p) {\n"
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" int i = 0;\n"
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" p = &i;\n"
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"}", false);
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ASSERT_EQUALS("[test.cpp:3]: (error) Address of local auto-variable assigned to a function parameter.\n", errout.str());
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check("void foo(std::string& s) {\n"
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" s = foo;\n"
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"}", false);
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ASSERT_EQUALS("", errout.str());
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}
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void testautovar9() {
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check("struct FN {int i;};\n"
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"struct FP {FN* f};\n"
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"void foo(int*& p, FN* p_fp) {\n"
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" FN fn;\n"
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" FP fp;\n"
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" p = &fn.i;\n"
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" p = &p_fp->i;\n"
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" p = &fp.f->i;\n"
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"}", false);
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ASSERT_EQUALS("[test.cpp:6]: (error) Address of local auto-variable assigned to a function parameter.\n", errout.str());
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}
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void testautovar10() { // #2930 - assignment of function parameter
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check("void foo(char* p) {\n"
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" p = 0;\n"
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"}");
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ASSERT_EQUALS("[test.cpp:2]: (warning) Assignment of function parameter has no effect outside the function.\n", errout.str());
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check("void foo(int b) {\n"
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" b = foo(b);\n"
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"}");
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ASSERT_EQUALS("[test.cpp:2]: (warning) Assignment of function parameter has no effect outside the function.\n", errout.str());
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check("void foo(char* p) {\n"
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" if (!p) p = buf;\n"
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" *p = 0;\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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check("void foo(char* p) {\n"
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" if (!p) p = buf;\n"
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" do_something(p);\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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check("void foo(char* p) {\n"
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" while (!p) p = buf;\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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check("void foo(char* p) {\n"
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" p = 0;\n"
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" asm(\"somecmd\");\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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check("void foo(Foo* p) {\n"
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" p = 0;\n"
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"}");
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ASSERT_EQUALS("[test.cpp:2]: (warning) Assignment of function parameter has no effect outside the function.\n", errout.str());
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check("class Foo {};\n"
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"void foo(Foo p) {\n"
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" p = 0;\n"
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"}");
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ASSERT_EQUALS("[test.cpp:3]: (warning) Assignment of function parameter has no effect outside the function.\n", errout.str());
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check("void foo(Foo p) {\n"
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" p = 0;\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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check("void foo(int& p) {\n"
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" p = 0;\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void testautovar_array1() {
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check("void func1(int* arr[2])\n"
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"{\n"
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" int num=2;"
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" arr[0]=#\n"
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"}");
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ASSERT_EQUALS("[test.cpp:3]: (error) Address of local auto-variable assigned to a function parameter.\n", errout.str());
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}
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void testautovar_array2() {
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check("class Fred {\n"
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" void func1(int* arr[2]);\n"
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"}\n"
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"void Fred::func1(int* arr[2])\n"
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"{\n"
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" int num=2;"
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" arr[0]=#\n"
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"}");
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ASSERT_EQUALS("[test.cpp:6]: (error) Address of local auto-variable assigned to a function parameter.\n", errout.str());
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}
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void testautovar_return1() {
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check("int* func1()\n"
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"{\n"
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" int num=2;"
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" return #"
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"}");
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ASSERT_EQUALS("[test.cpp:3]: (error) Address of an auto-variable returned.\n", errout.str());
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}
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void testautovar_return2() {
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check("class Fred {\n"
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" int* func1()\n"
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"}\n"
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"int* Fred::func1()\n"
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"{\n"
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" int num=2;"
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" return #"
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"}");
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ASSERT_EQUALS("[test.cpp:6]: (error) Address of an auto-variable returned.\n", errout.str());
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}
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void testautovar_return3() {
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// #2975 - FP
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check("void** f()\n"
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"{\n"
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" void *&value = tls[id];"
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" return &value;"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void testautovar_return4() {
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// #3030
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check("char *foo()\n"
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"{\n"
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" char q[] = \"AAAAAAAAAAAA\";\n"
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" return &q[1];\n"
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"}");
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ASSERT_EQUALS("[test.cpp:4]: (error) Address of an auto-variable returned.\n", errout.str());
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check("char *foo()\n"
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"{\n"
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" static char q[] = \"AAAAAAAAAAAA\";\n"
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" return &q[1];\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void testautovar_extern() {
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check("struct foo *f()\n"
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"{\n"
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" extern struct foo f;\n"
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" return &f;\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void testinvaliddealloc() {
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check("void func1() {\n"
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" char tmp1[256];\n"
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" free(tmp1);\n"
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" char tmp2[256];\n"
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" delete tmp2;\n"
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" char tmp3[256];\n"
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" delete tmp3;\n"
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" char tmp4[256];\n"
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" delete[] (tmp4);\n"
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" char tmp5[256];\n"
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" delete[] tmp5;\n"
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"}");
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ASSERT_EQUALS("[test.cpp:3]: (error) Deallocation of an auto-variable results in undefined behaviour.\n"
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"[test.cpp:5]: (error) Deallocation of an auto-variable results in undefined behaviour.\n"
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"[test.cpp:7]: (error) Deallocation of an auto-variable results in undefined behaviour.\n"
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"[test.cpp:9]: (error) Deallocation of an auto-variable results in undefined behaviour.\n"
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"[test.cpp:11]: (error) Deallocation of an auto-variable results in undefined behaviour.\n", errout.str());
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check("void func1() {\n"
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" char* tmp1[256];\n"
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" init(tmp1);\n"
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" delete tmp1[34];\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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check("void f()\n"
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"{\n"
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" char psz_title[10];\n"
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" {\n"
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" char *psz_title = 0;\n"
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" abc(0, psz_title);\n"
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" free(psz_title);\n"
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" }\n"
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"}");
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ASSERT_EQUALS(std::string(""), errout.str());
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}
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void testassign1() { // Ticket #1819
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check("void f(EventPtr *eventP, ActionPtr **actionsP) {\n"
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" EventPtr event = *eventP;\n"
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" *actionsP = &event->actions;\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void testassign2() { // Ticket #2765
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check("static void function(unsigned long **datap) {\n"
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" struct my_s *mr = global_structure_pointer;\n"
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" *datap = &mr->value;\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void returnLocalVariable1() {
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check("char *foo()\n"
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"{\n"
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" char str[100] = {0};\n"
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" return str;\n"
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"}");
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ASSERT_EQUALS("[test.cpp:4]: (error) Pointer to local array variable returned.\n", errout.str());
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check("class Fred {\n"
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" char *foo();\n"
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"};\n"
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"char *Fred::foo()\n"
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"{\n"
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" char str[100] = {0};\n"
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" return str;\n"
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"}");
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ASSERT_EQUALS("[test.cpp:7]: (error) Pointer to local array variable returned.\n", errout.str());
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}
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void returnLocalVariable2() {
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check("std::string foo()\n"
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"{\n"
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" char str[100] = {0};\n"
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" return str;\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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check("class Fred {\n"
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" std::string foo();\n"
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"};\n"
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"std::string Fred::foo()\n"
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"{\n"
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" char str[100] = {0};\n"
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" return str;\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void returnReference1() {
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check("std::string &foo()\n"
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"{\n"
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" std::string s;\n"
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" return s;\n"
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"}");
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ASSERT_EQUALS("[test.cpp:4]: (error) Reference to auto variable returned.\n", errout.str());
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check("std::vector<int> &foo()\n"
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"{\n"
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" std::vector<int> v;\n"
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" return v;\n"
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"}");
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ASSERT_EQUALS("[test.cpp:4]: (error) Reference to auto variable returned.\n", errout.str());
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check("std::vector<int> &foo()\n"
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"{\n"
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" static std::vector<int> v;\n"
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" return v;\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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check("std::string hello()\n"
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"{\n"
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" return \"hello\";\n"
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"}\n"
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"\n"
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"std::string &f()\n"
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"{\n"
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" return hello();\n"
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"}");
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ASSERT_EQUALS("[test.cpp:8]: (error) Reference to temporary returned.\n", errout.str());
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// make sure scope is used in function lookup
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check("class Fred {\n"
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" std::string hello() {\n"
|
|
" return std::string();\n"
|
|
" }\n"
|
|
"};\n"
|
|
"std::string &f() {\n"
|
|
" return hello();\n"
|
|
"}");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
check("std::string hello() {\n"
|
|
" return std::string();\n"
|
|
"}\n"
|
|
"\n"
|
|
"std::string &f() {\n"
|
|
" return hello();\n"
|
|
"}");
|
|
ASSERT_EQUALS("[test.cpp:6]: (error) Reference to temporary returned.\n", errout.str());
|
|
|
|
check("std::string hello() {\n"
|
|
" return \"foo\";\n"
|
|
"}\n"
|
|
"\n"
|
|
"std::string &f() {\n"
|
|
" return hello().substr(1);\n"
|
|
"}");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
check("class Foo;\n"
|
|
"Foo hello() {\n"
|
|
" return Foo();\n"
|
|
"}\n"
|
|
"\n"
|
|
"Foo& f() {\n"
|
|
" return hello();\n"
|
|
"}");
|
|
ASSERT_EQUALS("[test.cpp:7]: (error) Reference to temporary returned.\n", errout.str());
|
|
|
|
// make sure function overloads are handled properly
|
|
check("class Foo;\n"
|
|
"Foo & hello(bool) {\n"
|
|
" static Foo foo;\n"
|
|
" return foo;\n"
|
|
"}\n"
|
|
"Foo hello() {\n"
|
|
" return Foo();\n"
|
|
"}\n"
|
|
"\n"
|
|
"Foo& f() {\n"
|
|
" return hello(true);\n"
|
|
"}");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
check("Foo hello() {\n"
|
|
" return Foo();\n"
|
|
"}\n"
|
|
"\n"
|
|
"Foo& f() {\n" // Unknown type - might be a reference
|
|
" return hello();\n"
|
|
"}");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void returnReference2() {
|
|
check("class Fred {\n"
|
|
" std::string &foo();\n"
|
|
"}\n"
|
|
"std::string &Fred::foo()\n"
|
|
"{\n"
|
|
" std::string s;\n"
|
|
" return s;\n"
|
|
"}");
|
|
ASSERT_EQUALS("[test.cpp:7]: (error) Reference to auto variable returned.\n", errout.str());
|
|
|
|
check("class Fred {\n"
|
|
" std::vector<int> &foo();\n"
|
|
"};\n"
|
|
"std::vector<int> &Fred::foo()\n"
|
|
"{\n"
|
|
" std::vector<int> v;\n"
|
|
" return v;\n"
|
|
"}");
|
|
ASSERT_EQUALS("[test.cpp:7]: (error) Reference to auto variable returned.\n", errout.str());
|
|
|
|
check("class Fred {\n"
|
|
" std::vector<int> &foo();\n"
|
|
"};\n"
|
|
"std::vector<int> &Fred::foo()\n"
|
|
"{\n"
|
|
" static std::vector<int> v;\n"
|
|
" return v;\n"
|
|
"}");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
check("class Fred {\n"
|
|
" std::string &f();\n"
|
|
"};\n"
|
|
"std::string hello()\n"
|
|
"{\n"
|
|
" return \"hello\";\n"
|
|
"}\n"
|
|
"std::string &Fred::f()\n"
|
|
"{\n"
|
|
" return hello();\n"
|
|
"}");
|
|
ASSERT_EQUALS("[test.cpp:10]: (error) Reference to temporary returned.\n", errout.str());
|
|
|
|
check("class Fred {\n"
|
|
" std::string hello();\n"
|
|
" std::string &f();\n"
|
|
"};\n"
|
|
"std::string Fred::hello()\n"
|
|
"{\n"
|
|
" return \"hello\";\n"
|
|
"}\n"
|
|
"std::string &Fred::f()\n"
|
|
"{\n"
|
|
" return hello();\n"
|
|
"}");
|
|
ASSERT_EQUALS("[test.cpp:11]: (error) Reference to temporary returned.\n", errout.str());
|
|
|
|
check("class Bar;\n"
|
|
"Bar foo() {\n"
|
|
" return something;\n"
|
|
"}\n"
|
|
"Bar& bar() {\n"
|
|
" return foo();\n"
|
|
"}");
|
|
ASSERT_EQUALS("[test.cpp:6]: (error) Reference to temporary returned.\n", errout.str());
|
|
|
|
check("std::map<int, string> foo() {\n"
|
|
" return something;\n"
|
|
"}\n"
|
|
"std::map<int, string>& bar() {\n"
|
|
" return foo();\n"
|
|
"}");
|
|
ASSERT_EQUALS("[test.cpp:5]: (error) Reference to temporary returned.\n", errout.str());
|
|
|
|
check("Bar foo() {\n"
|
|
" return something;\n"
|
|
"}\n"
|
|
"Bar& bar() {\n" // Unknown type - might be a typedef to a reference type
|
|
" return foo();\n"
|
|
"}");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
// Don't crash with function in unknown scope (#4076)
|
|
check("X& a::Bar() {}"
|
|
"X& foo() {"
|
|
" return Bar();"
|
|
"}");
|
|
}
|
|
|
|
void returnReference3() {
|
|
check("double & f(double & rd) {\n"
|
|
" double ret = getValue();\n"
|
|
" rd = ret;\n"
|
|
" return rd;\n"
|
|
"}", false, false);
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
// Returning reference to global variable
|
|
void returnReference4() {
|
|
check("double a;\n"
|
|
"double & f() {\n"
|
|
" return a;\n"
|
|
"}");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void returnReference5() {
|
|
check("struct A {\n"
|
|
" int i;\n"
|
|
"};\n"
|
|
|
|
"struct B {\n"
|
|
" A a;\n"
|
|
"};\n"
|
|
|
|
"struct C {\n"
|
|
" B *b;\n"
|
|
" const A& a() const {\n"
|
|
" const B *pb = b;\n"
|
|
" const A &ra = pb->a;\n"
|
|
" return ra;\n"
|
|
" }\n"
|
|
"};");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void returnReference6() {
|
|
check("Fred & create() {\n"
|
|
" Fred &fred(*new Fred);\n"
|
|
" return fred;\n"
|
|
"}");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void returnReference7() { // 3791 - false positive for overloaded function
|
|
check("std::string a();\n"
|
|
"std::string &a(int);\n"
|
|
"std::string &b() {\n"
|
|
" return a(12);\n"
|
|
"}");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
check("std::string &a(int);\n"
|
|
"std::string a();\n"
|
|
"std::string &b() {\n"
|
|
" return a(12);\n"
|
|
"}");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
|
|
void testglobalnamespace() {
|
|
check("class SharedPtrHolder\n"
|
|
"{\n"
|
|
" ::std::tr1::shared_ptr<int> pNum;\n"
|
|
"public:\n"
|
|
" void SetNum(const ::std::tr1::shared_ptr<int> & apNum)\n"
|
|
" {\n"
|
|
" pNum = apNum;\n"
|
|
" }\n"
|
|
"}");
|
|
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void returnParameterAddress() {
|
|
check("int* foo(int y)\n"
|
|
"{\n"
|
|
" return &y;\n"
|
|
"}");
|
|
|
|
ASSERT_EQUALS("[test.cpp:3]: (error) Address of function parameter 'y' returned.\n", errout.str());
|
|
|
|
check("int ** foo(int * y)\n"
|
|
"{\n"
|
|
" return &y;\n"
|
|
"}");
|
|
|
|
ASSERT_EQUALS("[test.cpp:3]: (error) Address of function parameter 'y' returned.\n", errout.str());
|
|
|
|
check("const int * foo(const int & y)\n"
|
|
"{\n"
|
|
" return &y;\n"
|
|
"}");
|
|
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
};
|
|
|
|
REGISTER_TEST(TestAutoVariables)
|