/*
* 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 "config.h"
#include "exprengine.h"
#include "settings.h"
#include "tokenize.h"
#include "testsuite.h"
class TestBughuntingChecks : public TestFixture {
public:
TestBughuntingChecks() : TestFixture("TestBughuntingChecks") {
settings.platform(cppcheck::Platform::Unix64);
}
private:
Settings settings;
void run() OVERRIDE {
#ifdef USE_Z3
settings.inconclusive = true;
LOAD_LIB_2(settings.library, "std.cfg");
TEST_CASE(checkAssignment);
TEST_CASE(uninit);
TEST_CASE(uninit_array);
TEST_CASE(uninit_function_par);
TEST_CASE(uninit_malloc);
TEST_CASE(uninit_struct);
TEST_CASE(uninit_bailout);
TEST_CASE(uninit_fp_smartptr);
TEST_CASE(uninit_fp_struct);
TEST_CASE(uninit_fp_struct_member_init_2);
TEST_CASE(uninit_fp_template_var);
TEST_CASE(ctu);
#endif
}
void check(const char code[]) {
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
errout.str("");
ExprEngine::runChecks(this, &tokenizer, &settings);
}
void checkAssignment() {
check("void foo(int any) { __cppcheck_low__(0) int x; x = any; }");
ASSERT_EQUALS("[test.cpp:1]: (error) There is assignment, cannot determine that value is greater or equal with 0\n", errout.str());
check("struct S { __cppcheck_low__(0) int x; };\n"
"void foo(S *s, int any) { s->x = any; }");
ASSERT_EQUALS("[test.cpp:2]: (error) There is assignment, cannot determine that value is greater or equal with 0\n", errout.str());
}
void uninit() {
check("void foo() { int x; x = x + 1; }");
ASSERT_EQUALS("[test.cpp:1]: (error) Cannot determine that 'x' is initialized\n", errout.str());
check("void foo() { int x; int y = x + 1; }");
ASSERT_EQUALS("[test.cpp:1]: (error) Cannot determine that 'x' is initialized\n", errout.str());
check("void foo() { int x; x++; }");
ASSERT_EQUALS("[test.cpp:1]: (error) Cannot determine that 'x' is initialized\n", errout.str());
}
void uninit_array() {
check("void foo(int x) {\n"
" int a[10];\n"
" if (x > 0) a[0] = 32;\n"
" return a[0];\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Cannot determine that 'a[0]' is initialized\n", errout.str());
}
void uninit_function_par() {
// non constant parameters may point at uninitialized data
// constant parameters should point at initialized data
check("char foo(char id[]) { return id[0]; }");
ASSERT_EQUALS("[test.cpp:1]: (error) Cannot determine that 'id[0]' is initialized\n", errout.str());
check("char foo(const char id[]) { return id[0]; }");
ASSERT_EQUALS("", errout.str());
check("char foo(const char id[]);\n"
"void bar() { char data[10]; foo(data); }");
ASSERT_EQUALS("[test.cpp:2]: (error) Cannot determine that 'data[0]' is initialized\n", errout.str());
check("char foo(char id[]);\n"
"void bar() { char data[10]; foo(data); }");
ASSERT_EQUALS("[test.cpp:2]: (error, inconclusive) Cannot determine that 'data[0]' is initialized. It is inconclusive if there would be a problem in the function call.\n", errout.str());
check("void foo(int *p) { if (p) *p=0; }");
ASSERT_EQUALS("", errout.str());
}
void uninit_malloc() {
check("void foo() { char *p = malloc(10); return *p; }");
ASSERT_EQUALS("[test.cpp:1]: (error) Cannot determine that '*p' is initialized\n", errout.str());
}
void uninit_struct() {
// Assume that constructors initialize all members
// TODO whole program analysis
check("struct Data { Data(); int x; }\n"
"void foo() {\n"
" Data data;\n"
" x = data.x;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void uninit_bailout() {
check("void foo() {\n"
" __CPPCHECK_BAILOUT__;\n"
" int values[5];\n"
" values[i] = 123;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" __CPPCHECK_BAILOUT__;\n"
" std::ostringstream comm;\n"
" comm << 123;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ctu() {
check("void init(int &x) {\n"
" x = 1;\n"
"}\n"
"\n"
"void foo() {\n"
" int x;\n"
" init(x);\n"
" x++;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void init(int a, int &x) {\n"
" if (a < 10)\n"
" x = 1;\n"
"}\n"
"\n"
"void foo(int a) {\n"
" int x;\n"
" init(a, x);\n"
" x++;\n"
"}");
ASSERT_EQUALS("[test.cpp:9]: (error) Cannot determine that 'x' is initialized\n", errout.str());
check("void init(int a, int &x) {\n"
" if (a < 10)\n"
" x = 1;\n"
" else\n"
" x = 3;\n"
"}\n"
"\n"
"void foo(int a) {\n"
" int x;\n"
" init(a, x);\n"
" x++;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void uninit_fp_smartptr() {
check("void foo() {\n"
" std::unique_ptr<std::string> buffer;\n"
" try { } catch (std::exception& e) { }\n"
" doneCallback(std::move(buffer));\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void uninit_fp_struct() {
check("struct Pos {\n"
" int x {0};\n"
" int y {0};\n"
"};\n"
"\n"
"void dostuff() {\n"
" auto obj = C {};\n"
" Pos xy;\n"
" foo(xy);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void uninit_fp_struct_member_init_2() {
check("struct A {\n"
" int x {0}; int y {0};\n"
"};\n"
"void foo(const A& a) {\n"
" bar(a);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void uninit_fp_template_var() {
check("void foo() {\n"
" X*x = DYNAMIC_CAST(X, p);\n"
" C<int> c;\n"
" f(c);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestBughuntingChecks)