245 lines
8.8 KiB
C++
245 lines
8.8 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2016 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 "preprocessor.h"
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#include "tokenize.h"
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#include "symboldatabase.h"
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#include "checktype.h"
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#include "testsuite.h"
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#include "testutils.h"
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#include <tinyxml2.h>
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class TestType : public TestFixture {
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public:
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TestType() : TestFixture("TestType") {
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}
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private:
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void run() {
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TEST_CASE(checkTooBigShift);
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TEST_CASE(checkIntegerOverflow);
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TEST_CASE(signConversion);
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TEST_CASE(longCastAssign);
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TEST_CASE(longCastReturn);
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TEST_CASE(checkFloatToIntegerOverflow);
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}
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void check(const char code[], Settings* settings = 0) {
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// Clear the error buffer..
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errout.str("");
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if (!settings) {
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static Settings _settings;
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settings = &_settings;
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}
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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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// Check..
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CheckType checkType(&tokenizer, settings, this);
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checkType.runChecks(&tokenizer, settings, this);
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}
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void checkTooBigShift() {
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Settings settings;
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settings.platform(Settings::Unix32);
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check("int foo(int x) {\n"
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" return x << 32;\n"
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"}",&settings);
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ASSERT_EQUALS("[test.cpp:2]: (error) Shifting 32-bit value by 32 bits is undefined behaviour\n", errout.str());
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check("int foo(int x) {\n"
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" return x << 2;\n"
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"}",&settings);
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ASSERT_EQUALS("", errout.str());
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check("int foo(int x) {\n"
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" return (long long)x << 40;\n"
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"}",&settings);
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ASSERT_EQUALS("", errout.str());
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check("void foo() {\n"
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" QList<int> someList;\n"
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" someList << 300;\n"
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"}", &settings);
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ASSERT_EQUALS("", errout.str());
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// Ticket #6793
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check("template<int I> int foo(int x) { return x << I; }\n"
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"const int f = foo<31>(0);\n"
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"const int g = foo<100>(0);\n"
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"template<int I> int hoo(int x) { return x << 32; }\n"
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"const int h = hoo<100>(0);", &settings);
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ASSERT_EQUALS("[test.cpp:4]: (error) Shifting 32-bit value by 32 bits is undefined behaviour\n"
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"[test.cpp:1]: (error) Shifting 32-bit value by 100 bits is undefined behaviour\n", errout.str());
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// #7266: C++, shift in macro
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check("void f(int x) {\n"
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" UINFO(x << 1234);\n"
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"}");
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ASSERT_EQUALS("", errout.str());
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}
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void checkIntegerOverflow() {
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Settings settings;
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settings.platform(Settings::Unix32);
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settings.addEnabled("warning");
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check("void foo() {\n"
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" int intmax = 0x7fffffff;\n"
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" return intmax + 1;\n"
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"}",&settings);
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ASSERT_EQUALS("[test.cpp:3]: (error) Signed integer overflow for expression 'intmax+1'.\n", errout.str());
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check("void foo() {\n"
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" int intmax = 0x7fffffff;\n"
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" return intmax - 1;\n"
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"}",&settings);
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ASSERT_EQUALS("", errout.str());
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check("int foo(signed int x) {\n"
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" if (x==123456) {}\n"
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" return x * x;\n"
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"}",&settings);
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ASSERT_EQUALS("[test.cpp:3]: (warning) Either the condition 'x==123456' is redundant or there is signed integer overflow for expression 'x*x'.\n", errout.str());
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check("int foo(signed int x) {\n"
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" if (x==123456) {}\n"
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" return -123456 * x;\n"
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"}",&settings);
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ASSERT_EQUALS("[test.cpp:3]: (warning) Either the condition 'x==123456' is redundant or there is signed integer overflow for expression '-123456*x'.\n", errout.str());
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check("int foo(signed int x) {\n"
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" if (x==123456) {}\n"
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" return 123456U * x;\n"
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"}",&settings);
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ASSERT_EQUALS("", errout.str());
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}
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void signConversion() {
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check("unsigned int f1(signed int x, unsigned int y) {" // x is signed
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" return x * y;\n"
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"}\n"
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"void f2() { f1(-4,4); }");
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ASSERT_EQUALS("[test.cpp:1]: (warning) Suspicious code: sign conversion of x in calculation, even though x can have a negative value\n", errout.str());
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check("unsigned int f1(int x) {" // x has no signedness, but it can have the value -1 so assume it's signed
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" return x * 5U;\n"
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"}\n"
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"void f2() { f1(-4); }");
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ASSERT_EQUALS("[test.cpp:1]: (warning) Suspicious code: sign conversion of x in calculation, even though x can have a negative value\n", errout.str());
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check("unsigned int f1(int x) {" // #6168: FP for inner calculation
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" return 5U * (1234 - x);\n" // <- signed subtraction, x is not sign converted
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"}\n"
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"void f2() { f1(-4); }");
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ASSERT_EQUALS("", errout.str());
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// Don't warn for + and -
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check("void f1(int x) {"
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" a = x + 5U;\n"
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"}\n"
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"void f2() { f1(-4); }");
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ASSERT_EQUALS("", errout.str());
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check("size_t foo(size_t x) {\n"
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" return -2 * x;\n"
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"}");
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ASSERT_EQUALS("[test.cpp:2]: (warning) Suspicious code: sign conversion of -2 in calculation because '-2' has a negative value\n", errout.str());
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}
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void longCastAssign() {
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Settings settings;
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settings.addEnabled("style");
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settings.platform(Settings::Unix64);
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check("long f(int x, int y) {\n"
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" const long ret = x * y;\n"
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" return ret;\n"
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"}\n", &settings);
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ASSERT_EQUALS("[test.cpp:2]: (style) int result is assigned to long variable. If the variable is long to avoid loss of information, then you have loss of information.\n", errout.str());
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// typedef
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check("long f(int x, int y) {\n"
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" const size_t ret = x * y;\n"
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" return ret;\n"
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"}\n", &settings);
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ASSERT_EQUALS("", errout.str());
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// astIsIntResult
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check("long f(int x, int y) {\n"
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" const long ret = (long)x * y;\n"
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" return ret;\n"
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"}\n", &settings);
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ASSERT_EQUALS("", errout.str());
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}
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void longCastReturn() {
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Settings settings;
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settings.addEnabled("style");
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check("long f(int x, int y) {\n"
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" return x * y;\n"
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"}\n", &settings);
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ASSERT_EQUALS("[test.cpp:2]: (style) int result is returned as long value. If the return value is long to avoid loss of information, then you have loss of information.\n", errout.str());
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// typedef
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check("size_t f(int x, int y) {\n"
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" return x * y;\n"
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"}\n", &settings);
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ASSERT_EQUALS("", errout.str());
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}
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// This function ensure that test works with different compilers. Floats can
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// be stringified differently.
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std::string removeFloat(std::string errmsg) {
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std::string::size_type pos1 = errmsg.find("float (");
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std::string::size_type pos2 = errmsg.find(") conversion");
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if (pos1 == std::string::npos || pos2 == std::string::npos || pos1 > pos2)
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return errmsg;
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return errmsg.substr(0,pos1+7) + errmsg.substr(pos2);
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}
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void checkFloatToIntegerOverflow() {
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check("void f(void) {\n"
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" return (int)1E100;\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:2]: (error) Undefined behaviour: float () conversion overflow.\n", removeFloat(errout.str()));
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check("void f(void) {\n"
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" return (int)-1E100;\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:2]: (error) Undefined behaviour: float () conversion overflow.\n", removeFloat(errout.str()));
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check("void f(void) {\n"
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" return (short)1E6;\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:2]: (error) Undefined behaviour: float () conversion overflow.\n", removeFloat(errout.str()));
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}
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};
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REGISTER_TEST(TestType)
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