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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2020 Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "checkassert.h"
#include "settings.h"
#include "testsuite.h"
#include "tokenize.h"
class TestAssert : public TestFixture {
public:
TestAssert() : TestFixture("TestAssert") {}
private:
Settings settings;
void check(const char code[], const char *filename = "test.cpp") {
// Clear the error buffer..
errout.str("");
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, filename);
// Check..
CheckAssert checkAssert;
checkAssert.runChecks(&tokenizer, &settings, this);
}
void run() OVERRIDE {
settings.addEnabled("warning");
TEST_CASE(assignmentInAssert);
TEST_CASE(functionCallInAssert);
TEST_CASE(memberFunctionCallInAssert);
TEST_CASE(safeFunctionCallInAssert);
TEST_CASE(crash);
}
void safeFunctionCallInAssert() {
check(
"int a;\n"
"bool b = false;\n"
"int foo() {\n"
" if (b) { a = 1+2 };\n"
" return a;\n"
"}\n"
"assert(foo() == 3); \n"
);
ASSERT_EQUALS("", errout.str());
check(
"int foo(int a) {\n"
" int b=a+1;\n"
" return b;\n"
"}\n"
"assert(foo(1) == 2); \n"
);
ASSERT_EQUALS("", errout.str());
}
void functionCallInAssert() {
check(
"int a;\n"
"int foo() {\n"
" a = 1+2;\n"
" return a;\n"
"}\n"
"assert(foo() == 3); \n"
);
ASSERT_EQUALS("[test.cpp:6]: (warning) Assert statement calls a function which may have desired side effects: 'foo'.\n", errout.str());
// Ticket #4937 "false positive: Assert calls a function which may have desired side effects"
check("struct SquarePack {\n"
" static bool isRank1Or8( Square sq ) {\n"
" sq &= 0x38;\n"
" return sq == 0 || sq == 0x38;\n"
" }\n"
"};\n"
"void foo() {\n"
" assert( !SquarePack::isRank1Or8(push2) );\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct SquarePack {\n"
" static bool isRank1Or8( Square &sq ) {\n"
" sq &= 0x38;\n"
" return sq == 0 || sq == 0x38;\n"
" }\n"
"};\n"
"void foo() {\n"
" assert( !SquarePack::isRank1Or8(push2) );\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (warning) Assert statement calls a function which may have desired side effects: 'isRank1Or8'.\n", errout.str());
check("struct SquarePack {\n"
" static bool isRank1Or8( Square *sq ) {\n"
" *sq &= 0x38;\n"
" return *sq == 0 || *sq == 0x38;\n"
" }\n"
"};\n"
"void foo() {\n"
" assert( !SquarePack::isRank1Or8(push2) );\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (warning) Assert statement calls a function which may have desired side effects: 'isRank1Or8'.\n", errout.str());
check("struct SquarePack {\n"
" static bool isRank1Or8( Square *sq ) {\n"
" sq &= 0x38;\n"
" return sq == 0 || sq == 0x38;\n"
" }\n"
"};\n"
"void foo() {\n"
" assert( !SquarePack::isRank1Or8(push2) );\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void memberFunctionCallInAssert() {
check("struct SquarePack {\n"
" void Foo();\n"
"};\n"
"void foo(SquarePack s) {\n"
" assert( s.Foo(); );\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (warning) Assert statement calls a function which may have desired side effects: 'Foo'.\n", errout.str());
check("struct SquarePack {\n"
" void Foo() const;\n"
"};\n"
"void foo(SquarePack* s) {\n"
" assert( s->Foo(); );\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct SquarePack {\n"
" static void Foo();\n"
"};\n"
"void foo(SquarePack* s) {\n"
" assert( s->Foo(); );\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct SquarePack {\n"
"};\n"
"void foo(SquarePack* s) {\n"
" assert( s->Foo(); );\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void assignmentInAssert() {
check("void f() {\n"
" int a; a = 0;\n"
" assert(a = 2);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:3]: (warning) Assert statement modifies 'a'.\n", errout.str());
check("void f(int a) {\n"
" assert(a == 2);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int a, int b) {\n"
" assert(a == 2 && (b = 1));\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Assert statement modifies 'b'.\n", errout.str());
check("void f() {\n"
" int a; a = 0;\n"
" assert(a += 2);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:3]: (warning) Assert statement modifies 'a'.\n", errout.str());
check("void f() {\n"
" int a; a = 0;\n"
" assert(a *= 2);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:3]: (warning) Assert statement modifies 'a'.\n", errout.str());
check("void f() {\n"
" int a; a = 0;\n"
" assert(a -= 2);\n"
" return a;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:3]: (warning) Assert statement modifies 'a'.\n", errout.str());
check("void f() {\n"
" int a = 0;\n"
" assert(a--);\n"
" return a;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (warning) Assert statement modifies 'a'.\n", errout.str());
check("void f() {\n"
" int a = 0;\n"
" assert(--a);\n"
" return a;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (warning) Assert statement modifies 'a'.\n", errout.str());
check("void f() {\n"
" assert(std::all_of(first, last, []() {\n"
" auto tmp = x.someValue();\n"
" auto const expected = someOtherValue;\n"
" return tmp == expected;\n"
" }));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void crash() {
check("void foo() {\n"
" assert(sizeof(struct { int a[x++]; })==sizeof(int));\n"
"}");
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestAssert)