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cppcheck/test/testsizeof.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2014 Daniel Marjamäki and 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 "tokenize.h"
#include "checksizeof.h"
#include "testsuite.h"
#include <sstream>
extern std::ostringstream errout;
class TestSizeof : public TestFixture {
public:
TestSizeof() : TestFixture("TestSizeof") {
}
private:
void run() {
TEST_CASE(sizeofsizeof);
TEST_CASE(sizeofCalculation);
TEST_CASE(checkPointerSizeof);
TEST_CASE(sizeofForArrayParameter);
TEST_CASE(sizeofForNumericParameter);
TEST_CASE(suspiciousSizeofCalculation);
TEST_CASE(sizeofVoid);
TEST_CASE(customStrncat);
}
void check(const char code[]) {
// Clear the error buffer..
errout.str("");
Settings settings;
settings.addEnabled("warning");
settings.addEnabled("portability");
settings.inconclusive = true;
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// Check...
CheckSizeof checkSizeof(&tokenizer, &settings, this);
checkSizeof.runChecks(&tokenizer, &settings, this);
}
void sizeofsizeof() {
check("void foo()\n"
"{\n"
" int i = sizeof sizeof char;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Calling 'sizeof' on 'sizeof'.\n", errout.str());
check("void foo()\n"
"{\n"
" int i = sizeof (sizeof long);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Calling 'sizeof' on 'sizeof'.\n", errout.str());
check("void foo(long *p)\n"
"{\n"
" int i = sizeof (sizeof (p));\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Calling 'sizeof' on 'sizeof'.\n", errout.str());
}
void sizeofCalculation() {
check("int a, b; int a,sizeof(a+b)");
ASSERT_EQUALS("[test.cpp:1]: (warning) Found calculation inside sizeof().\n", errout.str());
check("int a, b; sizeof(a*b)");
ASSERT_EQUALS("[test.cpp:1]: (warning) Found calculation inside sizeof().\n", errout.str());
check("int a, b; sizeof(-a)");
ASSERT_EQUALS("[test.cpp:1]: (warning) Found calculation inside sizeof().\n", errout.str());
check("int a, b; sizeof(*a)");
ASSERT_EQUALS("", errout.str());
check("sizeof(void * const)");
ASSERT_EQUALS("", errout.str());
check("sizeof(int*[2])");
ASSERT_EQUALS("", errout.str());
check("sizeof(Fred**)");
ASSERT_EQUALS("", errout.str());
check("sizeof(foo++)");
ASSERT_EQUALS("[test.cpp:1]: (warning) Found calculation inside sizeof().\n", errout.str());
check("sizeof(--foo)");
ASSERT_EQUALS("[test.cpp:1]: (warning) Found calculation inside sizeof().\n", errout.str());
}
void sizeofForArrayParameter() {
check("void f() {\n"
" int a[10];\n"
" std::cout << sizeof(a) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" unsigned int a = 2;\n"
" unsigned int b = 2;\n"
" int c[(a+b)];\n"
" std::cout << sizeof(c) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" unsigned int a = { 2 };\n"
" unsigned int b[] = { 0 };\n"
" int c[a[b[0]]];\n"
" std::cout << sizeof(c) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" unsigned int a[] = { 1 };\n"
" unsigned int b = 2;\n"
" int c[(a[0]+b)];\n"
" std::cout << sizeof(c) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a[] = { 1, 2, 3 };\n"
" std::cout << sizeof(a) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a[3] = { 1, 2, 3 };\n"
" std::cout << sizeof(a) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f( int a[]) {\n"
" std::cout << sizeof(a) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (error) Using 'sizeof' on array given as "
"function argument returns size of a pointer.\n", errout.str());
check("void f( int a[]) {\n"
" std::cout << sizeof a / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (error) Using 'sizeof' on array given as "
"function argument returns size of a pointer.\n", errout.str());
check("void f( int a[3] ) {\n"
" std::cout << sizeof(a) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (error) Using 'sizeof' on array given as "
"function argument returns size of a pointer.\n", errout.str());
check("void f(int *p) {\n"
" p[0] = 0;\n"
" int unused = sizeof(p);\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" char p[] = \"test\";\n"
" int unused = sizeof(p);\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
// ticket #2495
check("void f() {\n"
" static float col[][3]={\n"
" {1,0,0},\n"
" {0,0,1},\n"
" {0,1,0},\n"
" {1,0,1},\n"
" {1,0,1},\n"
" {1,0,1},\n"
" };\n"
" const int COL_MAX=sizeof(col)/sizeof(col[0]);\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
// ticket #155
check("void f() {\n"
" char buff1[1024*64],buff2[sizeof(buff1)*2];\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
// ticket #2510
check("void f( int a[], int b) {\n"
" std::cout << sizeof(a) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (error) Using 'sizeof' on array given as "
"function argument returns size of a pointer.\n", errout.str());
// ticket #2510
check("void f( int a[3] , int b[2] ) {\n"
" std::cout << sizeof(a) / sizeof(int) << std::endl;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (error) Using 'sizeof' on array given as "
"function argument returns size of a pointer.\n", errout.str());
// ticket #2510
check("void f() {\n"
" char buff1[1024*64],buff2[sizeof(buff1)*(2+1)];\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void sizeofForNumericParameter() {
check("void f() {\n"
" std::cout << sizeof(10) << std::endl;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (warning) Suspicious usage of 'sizeof' with a numeric constant as parameter.\n", errout.str());
check("void f() {\n"
" std::cout << sizeof(-10) << std::endl;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (warning) Suspicious usage of 'sizeof' with a numeric constant as parameter.\n", errout.str());
check("void f() {\n"
" std::cout << sizeof 10 << std::endl;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (warning) Suspicious usage of 'sizeof' with a numeric constant as parameter.\n", errout.str());
check("void f() {\n"
" std::cout << sizeof -10 << std::endl;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (warning) Suspicious usage of 'sizeof' with a numeric constant as parameter.\n", errout.str());
}
void suspiciousSizeofCalculation() {
check("int* p;\n"
"return sizeof(p)/5;");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Division of result of sizeof() on pointer type.\n", errout.str());
check("unknown p;\n"
"return sizeof(p)/5;");
ASSERT_EQUALS("", errout.str());
check("return sizeof(unknown)/5;");
ASSERT_EQUALS("", errout.str());
check("int p;\n"
"return sizeof(p)/5;");
ASSERT_EQUALS("", errout.str());
check("int* p[5];\n"
"return sizeof(p)/5;");
ASSERT_EQUALS("", errout.str());
check("return sizeof(foo)*sizeof(bar);");
ASSERT_EQUALS("[test.cpp:1]: (warning, inconclusive) Multiplying sizeof() with sizeof() indicates a logic error.\n", errout.str());
check("return (foo)*sizeof(bar);");
ASSERT_EQUALS("", errout.str());
check("return sizeof(foo)*bar;");
ASSERT_EQUALS("", errout.str());
check("return (end - source) / sizeof(encode_block_type) * sizeof(encode_block_type);");
ASSERT_EQUALS("", errout.str());
}
void checkPointerSizeof() {
check("void f() {\n"
" char *x = malloc(10);\n"
" free(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int *x = malloc(sizeof(*x));\n"
" free(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int *x = malloc(sizeof(int));\n"
" free(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int *x = malloc(sizeof(x));\n"
" free(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Size of pointer 'x' used instead of size of its data.\n", errout.str());
check("void f() {\n"
" int *x = malloc(sizeof(&x));\n"
" free(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Size of pointer 'x' used instead of size of its data.\n", errout.str());
check("void f() {\n"
" int *x = malloc(100 * sizeof(x));\n"
" free(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Size of pointer 'x' used instead of size of its data.\n", errout.str());
check("void f() {\n"
" int *x = malloc(sizeof(x) * 100);\n"
" free(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Size of pointer 'x' used instead of size of its data.\n", errout.str());
check("void f() {\n"
" int *x = malloc(sizeof *x);\n"
" free(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int *x = malloc(sizeof x);\n"
" free(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Size of pointer 'x' used instead of size of its data.\n", errout.str());
check("void f() {\n"
" int *x = malloc(100 * sizeof x);\n"
" free(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Size of pointer 'x' used instead of size of its data.\n", errout.str());
check("void f() {\n"
" int *x = calloc(1, sizeof(*x));\n"
" free(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int *x = calloc(1, sizeof *x);\n"
" free(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int *x = calloc(1, sizeof(x));\n"
" free(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Size of pointer 'x' used instead of size of its data.\n", errout.str());
check("void f() {\n"
" int *x = calloc(1, sizeof x);\n"
" free(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Size of pointer 'x' used instead of size of its data.\n", errout.str());
check("void f() {\n"
" int *x = calloc(1, sizeof(int));\n"
" free(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" char x[10];\n"
" memset(x, 0, sizeof(x));\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" char* x[10];\n"
" memset(x, 0, sizeof(x));\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" char x[10];\n"
" memset(x, 0, sizeof x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int *x = malloc(sizeof(int));\n"
" memset(x, 0, sizeof(int));\n"
" free(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int *x = malloc(sizeof(int));\n"
" memset(x, 0, sizeof(*x));\n"
" free(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int *x = malloc(sizeof(int));\n"
" memset(x, 0, sizeof *x);\n"
" free(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int *x = malloc(sizeof(int));\n"
" memset(x, 0, sizeof x);\n"
" free(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) Size of pointer 'x' used instead of size of its data.\n", errout.str());
check("void f() {\n"
" int *x = malloc(sizeof(int));\n"
" memset(x, 0, sizeof(x));\n"
" free(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) Size of pointer 'x' used instead of size of its data.\n", errout.str());
check("void f() {\n"
" int *x = malloc(sizeof(int) * 10);\n"
" memset(x, 0, sizeof(x) * 10);\n"
" free(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) Size of pointer 'x' used instead of size of its data.\n", errout.str());
check("void f() {\n"
" int *x = malloc(sizeof(int) * 10);\n"
" memset(x, 0, sizeof x * 10);\n"
" free(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) Size of pointer 'x' used instead of size of its data.\n", errout.str());
check("void f() {\n"
" int *x = malloc(sizeof(int) * 10);\n"
" memset(x, 0, sizeof(*x) * 10);\n"
" free(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int *x = malloc(sizeof(int) * 10);\n"
" memset(x, 0, sizeof *x * 10);\n"
" free(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int *x = malloc(sizeof(int) * 10);\n"
" memset(x, 0, sizeof(int) * 10);\n"
" free(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"int fun(const char *buf1)\n"
"{\n"
" const char *buf1_ex = \"foobarbaz\";\n"
" return strncmp(buf1, buf1_ex, sizeof(buf1_ex)) == 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (warning, inconclusive) Size of pointer 'buf1_ex' used instead of size of its data.\n", errout.str());
check(
"int fun(const char *buf1) {\n"
" return strncmp(buf1, foo(buf2), sizeof(buf1)) == 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Size of pointer 'buf1' used instead of size of its data.\n", errout.str());
// #ticket 3874
check("void f()\n"
"{\n"
" int * pIntArray[10];\n"
" memset(pIntArray, 0, sizeof(pIntArray));\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void sizeofVoid() {
check("void f() {\n"
" int size = sizeof(void);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (portability) Behaviour of 'sizeof(void)' is not covered by the ISO C standard.\n", errout.str());
check("void f() {\n"
" void* p;\n"
" int size = sizeof(*p);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (portability) '*p' is of type 'void', the behaviour of 'sizeof(void)' is not covered by the ISO C standard.\n", errout.str());
check("void f() {\n"
" void* p = malloc(10);\n"
" int* p2 = p + 4;\n"
" int* p3 = p - 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (portability) 'p' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.\n"
"[test.cpp:4]: (portability) 'p' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.\n", errout.str());
check("void f() {\n"
" void* p1 = malloc(10);\n"
" void* p2 = malloc(5);\n"
" p1--;\n"
" p2++;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (portability) 'p1' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.\n"
"[test.cpp:5]: (portability) 'p2' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.\n", errout.str());
check("void f() {\n"
" void* p = malloc(10);\n"
" int* p2 = &p + 4;\n"
" int* p3 = &p - 1;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" void** p1 = malloc(10);\n"
" p1--;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" void** p1;\n"
" int j = sizeof(*p1);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" void* p1[5];\n"
" int j = sizeof(*p1);\n"
"}");
ASSERT_EQUALS("", errout.str());
// Calculations on void* with casts
check("void f(void *data) {\n"
" *((unsigned char *)data + 1) = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(void *data) {\n"
" *((unsigned char *)(data) + 1) = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(void *data) {\n"
" unsigned char* c = (unsigned char *)(data + 1);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (portability) 'data' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.\n", errout.str());
check("void f(void *data) {\n"
" unsigned char* c = (unsigned char *)data++;\n"
" unsigned char* c2 = (unsigned char *)++data;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (portability) 'data' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.\n"
"[test.cpp:3]: (portability) 'data' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.\n", errout.str());
check("void f(void *data) {\n"
" void* data2 = (void *)data + 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (portability) 'data' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.\n", errout.str());
// #4908 (void pointer as a member of a struct/class)
check("struct FOO {\n"
" void *data;\n"
"};\n"
"char f(struct FOO foo) {\n"
" char x = *((char*)(foo.data+1));\n"
" foo.data++;\n"
" return x;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (portability) 'foo.data' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.\n"
"[test.cpp:6]: (portability) 'foo.data' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.\n", errout.str());
check("struct FOO {\n"
" void *data;\n"
"};\n"
"char f(struct FOO foo) {\n"
" char x = *((char*)foo.data+1);\n"
" return x;\n"
"}\n"
"char f2(struct FOO foo) {\n"
" char x = *((char*)((FOO)foo).data + 1);\n"
" return x;\n"
"}\n"
"char f3(struct FOO* foo) {\n"
" char x = *((char*)foo->data + 1);\n"
" return x;\n"
"}\n"
"struct BOO {\n"
" FOO data;\n"
"};\n"
"void f4(struct BOO* boo) {\n"
" char c = *((char*)boo->data.data + 1);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct FOO {\n"
" void *data;\n"
"};\n"
"char f(struct FOO* foo) {\n"
" *(foo[1].data + 1) = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (portability) 'foo[1].data' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.\n", errout.str());
check("struct FOO {\n"
" void *data;\n"
"};\n"
"void f2(struct FOO* foo) {\n"
" (foo[0]).data++;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (portability) '(foo[0]).data' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.\n", errout.str());
}
void customStrncat() {
// Ensure we don't crash on custom-defined strncat, ticket #5875
check("char strncat ();\n"
"int main () {\n"
" return strncat ();\n"
"}\n");
}
};
REGISTER_TEST(TestSizeof)
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