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cppcheck/test/testuninitvar.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 "checkuninitvar.h"
#include "testsuite.h"
#include <sstream>
extern std::ostringstream errout;
class TestUninitVar : public TestFixture {
public:
TestUninitVar() : TestFixture("TestUninitVar") {
}
private:
Settings settings;
void run() {
LOAD_LIB_2(settings.library, "std.cfg");
TEST_CASE(uninitvar1);
TEST_CASE(uninitvar_bitop); // using uninitialized operand in bit operation
TEST_CASE(uninitvar_alloc); // data is allocated but not initialized
TEST_CASE(uninitvar_arrays); // arrays
TEST_CASE(uninitvar_class); // class/struct
TEST_CASE(uninitvar_enum); // enum variables
TEST_CASE(uninitvar_if); // handling if
TEST_CASE(uninitvar_loops); // handling for/while
TEST_CASE(uninitvar_switch); // handling switch
TEST_CASE(uninitvar_references); // references
TEST_CASE(uninitvar_return); // return
TEST_CASE(uninitvar_strncpy); // strncpy doesn't always null-terminate
TEST_CASE(uninitvar_memset); // not null-terminated
TEST_CASE(uninitvar_memset_nonchar);
TEST_CASE(uninitvar_memset_char_access);
TEST_CASE(uninitvar_func); // analyse functions
TEST_CASE(func_uninit_var); // analyse function calls for: 'int a(int x) { return x+x; }'
TEST_CASE(func_uninit_pointer); // analyse function calls for: 'void a(int *p) { *p = 0; }'
TEST_CASE(uninitvar_typeof); // typeof
// checking for uninitialized variables without using the
// ExecutionPath functionality
TEST_CASE(uninitvar2);
TEST_CASE(uninitvar3); // #3844
TEST_CASE(uninitvar4); // #3869 (reference)
TEST_CASE(uninitvar5); // #3861
TEST_CASE(uninitvar6); // handling unknown types in C and C++ files
TEST_CASE(uninitvar2_func); // function calls
TEST_CASE(uninitvar2_value); // value flow
TEST_CASE(uninitvar2_structmembers); // struct members
TEST_CASE(uninitvar2_while);
TEST_CASE(uninitvar2_4494); // #4494
TEST_CASE(uninitvar2_malloc); // malloc returns uninitialized data
TEST_CASE(uninitvar7); // ticket #5971
TEST_CASE(uninitvar8); // ticket #6230
TEST_CASE(syntax_error); // Ticket #5073
// Test that the functions from std.cfg are configured correctly
TEST_CASE(stdcfg_btowc);
TEST_CASE(stdcfg_clearerr);
TEST_CASE(stdcfg_fclose);
TEST_CASE(stdcfg_fopen);
TEST_CASE(stdcfg_feof);
TEST_CASE(stdcfg_ferror);
TEST_CASE(stdcfg_fflush);
TEST_CASE(stdcfg_fgetc);
TEST_CASE(stdcfg_fgetpos);
TEST_CASE(stdcfg_fsetpos);
TEST_CASE(stdcfg_fgets);
TEST_CASE(stdcfg_fputc);
TEST_CASE(stdcfg_fputs);
TEST_CASE(stdcfg_ftell);
TEST_CASE(stdcfg_puts);
TEST_CASE(stdcfg_putchar);
TEST_CASE(stdcfg_wcstombs);
TEST_CASE(stdcfg_tmpnam);
// dead pointer
TEST_CASE(deadPointer);
TEST_CASE(uninitvar_posix_write);
}
void checkUninitVar(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);
tokenizer.simplifyTokenList2();
// Check code..
CheckUninitVar check(&tokenizer, &settings, this);
check.executionPaths();
}
void uninitvar1() {
// Ticket #2207 - False negative
checkUninitVar("void foo() {\n"
" int a;\n"
" b = c - a;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("void foo() {\n"
" int a;\n"
" b = a - c;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("void foo() {\n"
" int *p;\n"
" realloc(p,10);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar("void foo() {\n" // #5240
" char *p = malloc(100);\n"
" char *tmp = realloc(p,1000);\n"
" if (!tmp) free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo() {\n"
" int *p = NULL;\n"
" realloc(p,10);\n"
"}");
ASSERT_EQUALS("", errout.str());
// dereferencing uninitialized pointer..
checkUninitVar("static void foo()\n"
"{\n"
" Foo *p;\n"
" p->abcd();\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" Foo<int> *p;\n"
" p->abcd();\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar("void f(Foo *p)\n"
"{\n"
" int a;\n"
" p->a = malloc(4 * a);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" int *p;\n"
" delete p;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" int *p;\n"
" delete [] p;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" int *p;\n"
" *p = 135;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" int *p;\n"
" p[0] = 135;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" int *x;\n"
" int y = *x;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" int *x;\n"
" int &y(*x);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" int x;\n"
" int *y = &x;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" int *x;\n"
" int *&y = x;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" int x = xyz::x;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int a;\n"
" a = 5 + a;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int a;\n"
" a++;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" extern int a;\n"
" a++;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int a;\n"
" bar(4 * a);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" int i;\n"
" if (i);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: i\n", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" int i;\n"
" for (int x = 0; i < 10; x++);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: i\n", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" int i;\n"
" for (int x = 0; x < 10; i++);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: i\n", errout.str());
checkUninitVar("static int foo(int x)\n"
"{\n"
" int i;\n"
" if (x)\n"
" i = 0;\n"
" i++;\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: i\n", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" int ar[10];\n"
" int i;\n"
" ar[i] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: i\n", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" int x, y;\n"
" x = (y = 10);\n"
" int z = y * 2;\n"
"}");
ASSERT_EQUALS("", errout.str());
// Ticket #3597
checkUninitVar("int f() {\n"
" int a;\n"
" int b = 1;\n"
" (b += a) = 1;\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n","", errout.str());
checkUninitVar("int f() {\n"
" int a,b,c;\n"
" a = b = c;\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: c\n", "", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" Foo p;\n"
" p.abcd();\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" Foo p;\n"
" int x = p.abcd();\n"
"}");
ASSERT_EQUALS("", errout.str());
// Unknown types
{
checkUninitVar("void a()\n"
"{\n"
" A ret;\n"
" return ret;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void a()\n"
"{\n"
" A ret;\n"
" return ret;\n"
"}\n",
"test.c");
TODO_ASSERT_EQUALS("[test.c:4]: (error) Uninitialized variable: ret\n", "", errout.str());
// #3916 - avoid false positive
checkUninitVar("void f(float x) {\n"
" union lf { long l; float f; } u_lf;\n"
" float hx = (u_lf.f = (x), u_lf.l);\n"
"}\n",
"test.c");
ASSERT_EQUALS("", errout.str());
}
checkUninitVar("void a()\n"
"{\n"
" int x[10];\n"
" int *y = x;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void a()\n"
"{\n"
" int x;\n"
" int *y = &x;\n"
" *y = 0;\n"
" x++;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void a()\n"
"{\n"
" char x[10], y[10];\n"
" char *z = x;\n"
" memset(z, 0, sizeof(x));\n"
" memcpy(y, x, sizeof(x));\n"
"}");
ASSERT_EQUALS("", errout.str());
// #5255
checkUninitVar("struct Element {\n"
" static void abcd() {}\n"
"};\n"
"void a() {\n"
" Element *e;\n"
" e->abcd();\n"
"}");
ASSERT_EQUALS("", errout.str());
// Handling >> and <<
{
checkUninitVar("int a() {\n"
" int ret;\n"
" std::cin >> ret;\n"
" ret++;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int a() {\n"
" int ret;\n"
" int a = value >> ret;\n"
" ret++;\n"
"}\n",
"test.c");
ASSERT_EQUALS("[test.c:3]: (error) Uninitialized variable: ret\n", errout.str());
checkUninitVar("void foo() {\n" // #3707
" Node node;\n"
" int x;\n"
" node[\"abcd\"] >> x;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int a(FArchive &arc) {\n" // #3060 (initialization through operator<<)
" int *p;\n"
" arc << p;\n"
" return *p;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int a() {\n"
" int ret;\n"
" int a = value << ret;\n"
" return ret;\n"
"}\n",
"test.c");
ASSERT_EQUALS("[test.c:3]: (error) Uninitialized variable: ret\n", errout.str());
// #4320
checkUninitVar("void f() {\n"
" int a;\n"
" a << 1;\n"
" return a;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
checkUninitVar("void a() {\n" // asm
" int x;\n"
" asm();\n"
" x++;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void a()\n"
"{\n"
" int x[10];\n"
" struct xyz xyz1 = { .x = x };\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void a()\n"
"{\n"
" struct S *s;\n"
" s->x = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: s\n", errout.str());
checkUninitVar("void a()\n"
"{\n"
" struct S *s;\n"
" FOREACH() { }\n"
" s->x = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: s\n", errout.str());
checkUninitVar("void a()\n"
"{\n"
" struct S *s1;\n"
" struct S *s2;\n"
" FOREACH(s1) { }\n"
" s2->x = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: s2\n", errout.str());
// #1533
checkUninitVar("char a()\n"
"{\n"
" char key;\n"
" struct A msg = { .buf = {&key} };\n"
" init(&msg);\n"
" key++;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" char *buf = malloc(100);\n"
" struct ABC *abc = buf;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("class Fred {\n"
"public:\n"
" FILE *f;\n"
" ~Fred();\n"
"}\n"
"Fred::~Fred()\n"
"{\n"
" fclose(f);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int c;\n"
" ab(sizeof(xyz), &c);\n"
" if (c);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int c;\n"
" a = (f2(&c));\n"
" c++;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f(int a)\n"
"{\n"
" if (a) {\n"
" char *p;\n"
" *p = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: p\n", errout.str());
// +=
checkUninitVar("void f()\n"
"{\n"
" int c;\n"
" c += 2;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: c\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char *s = malloc(100);\n"
" *s += 10;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory is allocated but not initialized: s\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int a[10];\n"
" a[0] = 10 - a[1];\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n", errout.str());
// goto/setjmp/longjmp..
checkUninitVar("void foo(int x)\n"
"{\n"
" long b;\n"
" if (g()) {\n"
" b =2;\n"
" goto found;\n"
" }\n"
"\n"
" return;\n"
"\n"
"found:\n"
" int a = b;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int foo()\n"
"{\n"
" jmp_buf env;\n"
" int a;\n"
" int val = setjmp(env);\n"
" if(val)\n"
" return a;\n"
" a = 1;\n"
" longjmp(env, 1);\n"
"}");
ASSERT_EQUALS("", errout.str());
// macro_for..
checkUninitVar("int foo()\n"
"{\n"
" int retval;\n"
" if (condition) {\n"
" for12(1,2) { }\n"
" retval = 1;\n"
" }\n"
" else\n"
" retval = 2;\n"
" return retval;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int foo()\n"
"{\n"
" int i;\n"
" goto exit;\n"
" i++;\n"
"exit:\n"
"}");
ASSERT_EQUALS("", errout.str());
// Ticket #3873 (false positive)
checkUninitVar("MachineLoopRange *MachineLoopRanges::getLoopRange(const MachineLoop *Loop) {\n"
" MachineLoopRange *&Range = Cache[Loop];\n"
" if (!Range)\n"
" Range = new MachineLoopRange(Loop, Allocator, *Indexes);\n"
" return Range;\n"
"}");
ASSERT_EQUALS("", errout.str());
// #4040 - False positive
checkUninitVar("int f(int x) {\n"
" int iter;\n"
" {\n"
" union\n"
" {\n"
" int asInt;\n"
" double asDouble;\n"
" };\n"
"\n"
" iter = x;\n"
" }\n"
" return 1 + iter;\n"
"}");
ASSERT_EQUALS("", errout.str());
// C++11 style initialization
checkUninitVar("int f() {\n"
" int i = 0;\n"
" int j{ i };\n"
" return j;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void uninitvar3() { // #3844
// avoid false positive
checkUninitVar2("namespace std _GLIBCXX_VISIBILITY(default)\n"
"{\n"
"_GLIBCXX_BEGIN_NAMESPACE_CONTAINER\n"
" typedef unsigned long _Bit_type;\n"
" struct _Bit_reference\n"
" {\n"
" _Bit_type * _M_p;\n"
" _Bit_type _M_mask;\n"
" _Bit_reference(_Bit_type * __x, _Bit_type __y)\n"
" : _M_p(__x), _M_mask(__y) { }\n"
" };\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void uninitvar_bitop() {
checkUninitVar2("void foo() {\n"
" int b;\n"
" c = a | b;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: b\n", errout.str());
checkUninitVar2("void foo() {\n"
" int b;\n"
" c = b | a;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: b\n", errout.str());
}
// if..
void uninitvar_if() {
checkUninitVar2("static void foo()\n"
"{\n"
" Foo *p;\n"
" if (x)\n"
" p = new Foo;\n"
" p->abcd();\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar2("static void foo(int x)\n"
"{\n"
" int a;\n"
" if (x==1);\n"
" if (x==2);\n"
" x = a;\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar2("int foo()\n"
"{\n"
" int i;\n"
" if (x)\n"
" i = 22;\n"
" else\n"
" i = 33;\n"
" return i;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("int foo()\n"
"{\n"
" int i;\n"
" if (x)\n"
" i = 22;\n"
" else\n"
" {\n"
" char *y = {0};\n"
" i = 33;\n"
" }\n"
" return i;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int foo()\n"
"{\n"
" int i;\n"
" if (x)\n"
" {\n"
" struct abc abc1 = (struct abc) { .a=0, .b=0, .c=0 };\n"
" i = 22;\n"
" }\n"
" else\n"
" {\n"
" i = 33;\n"
" }\n"
" return i;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("static void foo(int x)\n"
"{\n"
" Foo *p;\n"
" if (x)\n"
" p = new Foo;\n"
" if (x)\n"
" p->abcd();\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void foo(int a)\n"
"{\n"
" int n;\n"
" int condition;\n"
" if(a == 1) {\n"
" n=0;\n"
" condition=0;\n"
" }\n"
" else {\n"
" n=1;\n"
" }\n"
"\n"
" if( n == 0) {\n"
" a=condition;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f()\n"
"{\n"
" C *c;\n"
" if (fun(&c));\n"
" c->Release();\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" char a[10];\n"
" if (a[0] = x){}\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("int foo(int x)\n"
"{\n"
" int i;\n"
" if (one())\n"
" i = 1;\n"
" else\n"
" return 3;\n"
" return i;\n"
"}");
ASSERT_EQUALS("", errout.str());
// Ticket #2207 - False positive
checkUninitVar2("void foo(int x) {\n"
" int a;\n"
" if (x)\n"
" a = 1;\n"
" if (!x)\n"
" return;\n"
" b = (c - a);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("int foo()\n"
"{\n"
" int ret;\n"
" if (one())\n"
" ret = 1;\n"
" else\n"
" throw 3;\n"
" return ret;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("int f(int a)\n"
"{\n"
" int ret;\n"
" if (a == 1)\n"
" ret = 1;\n"
" else\n"
" XYZ ret = 2;\n" // XYZ may be an unexpanded macro so bailout the checking of "ret".
" return ret;\n"
"}");
ASSERT_EQUALS("[test.cpp:8]: (error) Uninitialized variable: ret\n", errout.str());
checkUninitVar2("int f(int a, int b)\n"
"{\n"
" int x;\n"
" if (a)\n"
" x = a;\n"
" else {\n"
" do { } while (f2());\n"
" x = b;\n"
" }\n"
" return x;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void foo(long verbose,bool bFlag)\n"
"{\n"
" double t;\n"
" if (bFlag)\n"
" {\n"
" if (verbose)\n"
" t = 1;\n"
" if (verbose)\n"
" std::cout << (12-t);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("int test(int cond1, int cond2) {\n"
" int foo;\n"
" if (cond1 || cond2) {\n"
" if (cond2)\n"
" foo = 0;\n"
" }\n"
" if (cond2) {\n"
" int t = foo*foo;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
// ? :
checkUninitVar("static void foo(int v)\n"
"{\n"
" int x;\n"
" x = v <= 0 ? -1 : x;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar2("void foo()\n"
"{\n"
" const char *msgid1, *msgid2;\n"
" int ret = bar(&msgid1);\n"
" if (ret > 0) {\n"
" ret = bar(&msgid2);\n"
" }\n"
" ret = ret <= 0 ? -1 :\n"
" strcmp(msgid1, msgid2) == 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void foo(int a, int b)\n"
"{\n"
" int x; x = (a<b) ? 1 : 0;\n"
" int y = y;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: y\n", errout.str());
// ; { .. }
checkUninitVar2("int foo()\n"
"{\n"
" int retval;\n"
" if (condition) {\n"
" { }\n"
" retval = 1; }\n"
" else\n"
" retval = 2;\n"
" return retval;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void foo()\n"
"{\n"
" {\n"
" for (int i = 0; i < 10; ++i)\n"
" { }\n"
" }\n"
"\n"
" { }\n"
"}");
ASSERT_EQUALS("", errout.str());
// Ticket #3098 - False negative uninitialized variable
checkUninitVar("void f()\n"
"{\n"
" char *c1,*c2;\n"
" if(strcoll(c1,c2))\n"
" {\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: c1\n"
"[test.cpp:4]: (error) Uninitialized variable: c2\n", errout.str());
checkUninitVar2("void f(char *c1, char *c2)\n"
"{\n"
" if(strcoll(c1,c2))\n"
" {\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f()\n"
"{\n"
" char *c1;\n"
" c1=strcpy(c1,\"test\");\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: c1\n","", errout.str());
checkUninitVar2("void f(char *c1)\n"
"{\n"
" c1=strcpy(c1,\"test\");\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// handling for/while loops..
void uninitvar_loops() {
// for..
checkUninitVar2("void f()\n"
"{\n"
" for (int i = 0; i < 4; ++i) {\n"
" int a;\n"
" b(4*a);\n"
" }"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar2("void f() {\n"
" int k;\n"
" for (int i = 0; i < 4; ++i) {\n"
" k = k + 2;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: k\n", errout.str());
checkUninitVar2("void f() {\n"
" gchar sel[10];\n"
" for (int i = 0; i < 4; ++i) {\n"
" int sz = sizeof(sel);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("enum ABCD { A, B, C, D };\n"
"\n"
"static void f(char *str ) {\n"
" enum ABCD i;\n"
" for (i = 0; i < D; i++) {\n"
" str[i] = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void x() {\n"
" do {\n"
" Token * tok;\n"
" for (tok = a; tok; tok = tok->next())\n"
" {\n"
" }\n"
" } while (tok2);\n"
"}");
ASSERT_EQUALS("", errout.str());
// while..
checkUninitVar("int f()\n"
"{\n"
" int i;\n"
" while (fgets())\n"
" i = 1;\n"
" return i;"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: i\n", errout.str());
checkUninitVar2("void f(int i)\n"
"{\n"
" int a;\n"
" while (i < 10)\n"
" i++;\n"
" a++;"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: a\n", errout.str());
// Ticket #2226: C++0x loop
checkUninitVar2("void f() {\n"
" container c;\n"
" for (iterator it : c) {\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
// Ticket #2345: False positive in sub-condition in if inside a loop
checkUninitVar2("void f(int x) {\n"
" const PoolItem* pItem;\n"
" while (x > 0) {\n"
" if (GetItem(&pItem) && (*pItem != rPool))\n"
" { }\n"
" x--;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f(int x) {\n"
" const PoolItem* pItem;\n"
" while (x > 0) {\n"
" if (*pItem != rPool)\n"
" { }\n"
" x--;\n"
" }\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: pItem\n",
"", errout.str());
// #2231 - conditional initialization in loop..
checkUninitVar("int foo(char *a) {\n"
" int x;\n"
"\n"
" for (int i = 0; i < 10; ++i) {\n"
" if (a[i] == 'x') {\n"
" x = i;\n"
" break;\n"
" }\n"
" }\n"
"\n"
" return x;\n"
"}");
ASSERT_EQUALS("[test.cpp:11]: (error) Uninitialized variable: x\n", errout.str());
// Ticket #2796
checkUninitVar2("void foo() {\n"
" while (true) {\n"
" int x;\n"
" if (y) x = 0;\n"
" else break;\n"
" return x;\n" // <- x is initialized
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
// Assignment in for. Ticket #3287
checkUninitVar2("int foo(char* in, bool b) {\n"
" char* c;\n"
" if (b) for (c = in; *c == 0; ++c) {}\n"
" else c = in + strlen(in) - 1;\n"
" *c = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// switch..
void uninitvar_switch() {
checkUninitVar("void f(int x)\n"
"{\n"
" short c;\n"
" switch(x) {\n"
" case 1:\n"
" c++;\n"
" break;\n"
" };\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: c\n", errout.str());
checkUninitVar2("char * f()\n"
"{\n"
" static char ret[200];\n"
" memset(ret, 0, 200);\n"
" switch (x)\n"
" {\n"
" case 1: return ret;\n"
" case 2: return ret;\n"
" }\n"
" return 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("int foo(const int iVar, unsigned int slot, unsigned int pin)\n"
"{\n"
" int i;\n"
" if (iVar == 0)\n"
" {\n"
" switch (slot)\n"
" {\n"
" case 4: return 5;\n"
" default: return -1;\n"
" }\n"
" }\n"
" else\n"
" {\n"
" switch (pin)\n"
" {\n"
" case 0: i = 2; break;\n"
" default: i = -1; break;\n"
" }\n"
" }\n"
" return i;\n"
"}");
ASSERT_EQUALS("", errout.str());
// No segmentation fault
checkUninitVar("void a() try\n"
"{\n"
" {\n"
" while (1) {\n"
" switch (1) {\n"
" case 1: {\n"
" int i;\n"
" }\n"
" }\n"
" }\n"
" } catch (...) {\n"
" }\n"
"}");
// #1855 - switch(foo(&x))
checkUninitVar2("int a()\n"
"{\n"
" int x;\n"
" switch (foo(&x))\n"
" {\n"
" case 1:\n"
" return x;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
// #3231 - ({ switch .. })
checkUninitVar("void f() {\n"
" int a;\n"
" ({\n"
" switch(sizeof(int)) {\n"
" case 4:\n"
" default:\n"
" (a)=0;\n"
" break;\n"
" };\n"
" })\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// arrays..
void uninitvar_arrays() {
checkUninitVar("int f()\n"
"{\n"
" char a[10];\n"
" a[a[0]] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("int f()\n"
"{\n"
" char a[10];\n"
" char c = *a;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("int f()\n"
"{\n"
" char a[SIZE+10];\n"
" char c = *a;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("int f()\n"
"{\n"
" char a[10];\n"
" *a = '\\0';\n"
" int i = strlen(a);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f()\n"
"{\n"
" char a, b[10];\n"
" a = b[0] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f()\n"
"{\n"
" char a[10], b[10];\n"
" a[0] = b[0] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f()\n"
"{\n"
" char a[10], *p;\n"
" *(p = a) = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" char a[10], *p;\n"
" p = &(a[10]);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f()\n"
"{\n"
" char c[50] = \"\";\n"
" strcat(c, \"test\");\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char s[20];\n"
" strcpy(s2, s);\n"
"};");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: s\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char s[20];\n"
" strcat(s, \"abc\");\n"
"};");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: s\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char s[20];\n"
" strchr(s, ' ');\n"
"};");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: s\n", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" int y[2];\n"
" int s;\n"
" GetField( y + 0, y + 1 );\n"
" s = y[0]*y[1];\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void foo()\n"
"{\n"
" int a[2];\n"
" init(a - 1);\n"
" int b = a[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void foo()\n"
"{\n"
" Fred a[2];\n"
" Fred b = a[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
// Ticket #2320
checkUninitVar2("void foo() {\n"
" char a[2];\n"
" char *b = (a+2) & 7;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f() {\n" // Ticket #3050
" char a[2];\n"
" printf(\"%s\", a);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar2("void f() {\n" // Ticket #5108 (fp)
" const char *a;\n"
" printf(\"%s\", a=\"abc\");\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n" // Ticket #3497
" char header[1];\n"
" *((unsigned char*)(header)) = 0xff;\n"
" return header[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n" // Ticket #3497
" char header[1];\n"
" *((unsigned char*)((unsigned char *)(header))) = 0xff;\n"
" return header[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" ABC abc;\n"
" int a[1];\n"
"\n"
" abc.a = a;\n"
" init(&abc);\n"
" return a[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
// ticket #3344
checkUninitVar("void f(){\n"
" char *strMsg = \"This is a message\";\n"
" char *buffer=(char*)malloc(128*sizeof(char));\n"
" strcpy(strMsg,buffer);\n"
" free(buffer);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory is allocated but not initialized: buffer\n", errout.str());
// #3845
checkUninitVar2("int foo() {\n"
" int a[1] = {5};\n"
" return a[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("int foo() {\n"
" int a[2][2] = {{3,4}, {5,6}};\n"
" return a[0][1];\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int foo() {\n"
" int a[1];\n"
" return a[0];\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar2("int foo() {\n"
" int a[2][2];\n"
" return a[0][1];\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", "", errout.str());
// # 4740
checkUninitVar2("void f() {\n"
" int *a[2][19];\n"
" int **b = a[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// alloc..
void uninitvar_alloc() {
checkUninitVar("void f()\n"
"{\n"
" char *s = malloc(100);\n"
" strcat(s, \"abc\");\n"
"};");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory is allocated but not initialized: s\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char *s = malloc(100);\n"
" perror(s);\n"
"};");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory is allocated but not initialized: s\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char *s1 = new char[10];\n"
" char *s2 = new char[strlen(s1)];\n"
"};");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory is allocated but not initialized: s1\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char *p = malloc(64);\n"
" int x = p[0];\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory is allocated but not initialized: p\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char *p = malloc(64);\n"
" if (p[0]) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory is allocated but not initialized: p\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char *p = malloc(64);\n"
" return p[0];\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory is allocated but not initialized: p\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" Fred *fred = new Fred;\n"
" fred->foo();\n"
"};");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" Fred *fred = malloc(sizeof(Fred));\n"
" x(&fred->f);\n"
"};");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" Fred *fred = malloc(sizeof(Fred));\n"
" x(fred->f);\n"
"};");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo(char *s)\n"
"{\n"
" char *a = malloc(100);\n"
" *a = *s;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" char *a;\n"
" if (a);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" char *a = malloc(100);\n"
" if (a);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" ABC *abc = malloc(100);\n"
" abc->a = 123;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" ABC *abc = malloc(100);\n"
" abc->a.word = 123;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" ABC *abc = malloc(100);\n"
" abc->a = 123;\n"
" abc->a += 123;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" ABC *abc = malloc(100);\n"
" free(abc);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char *s = malloc(100);\n"
" if (!s)\n"
" return;\n"
" char c = *s;\n"
"};");
ASSERT_EQUALS("[test.cpp:6]: (error) Memory is allocated but not initialized: s\n", errout.str());
// #3708 - false positive when using ptr typedef
checkUninitVar("void f() {\n"
" uintptr_t x = malloc(100);\n"
" uintptr_t y = x + 10;\n" // <- not bad usage
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f() {\n"
" z_stream strm;\n"
" char* buf = malloc(10);\n"
" strm.next_out = buf;\n"
" deflate(&strm, Z_FINISH);\n"
" memcpy(body, buf, 10);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// class / struct..
void uninitvar_class() {
checkUninitVar("class Fred\n"
"{\n"
" int i;\n"
" int a() { return i; }\n"
"};");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" struct Relative {\n"
" Surface *surface;\n"
" void MoveTo(int x, int y) {\n"
" surface->MoveTo();\n"
" }\n"
" };\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" static const struct ab {\n"
" int a,b;\n"
" int get_a() { return a; }"
" } = { 0, 0 };\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int i;\n"
" {\n"
" union ab {\n"
" int a,b;\n"
" }\n"
" i = 0;\n"
" }\n"
" return i;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f(int x) {\n"
" struct AB ab;\n"
" x = ab.x = 12;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// enum..
void uninitvar_enum() {
checkUninitVar("void f()\n"
"{\n"
" enum AB { a, b };\n"
" AB ab;\n"
" if (ab);\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: ab\n", errout.str());
}
// references..
void uninitvar_references() {
checkUninitVar("void f()\n"
"{\n"
" int a;\n"
" int &b = a;\n"
" b = 0;\n"
" int x = a;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f(struct blame_entry *ent)\n"
"{\n"
" struct origin *suspect = ent->suspect;\n"
" char hex[41];\n"
" strcpy(hex, sha1_to_hex(suspect->commit->object.sha1));\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" const std::string s(x());\n"
" strchr(s.c_str(), ',');\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void uninitvar_return() {
checkUninitVar("static int foo()\n"
"{\n"
" int ret;\n"
" return ret;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: ret\n", errout.str());
checkUninitVar("static int foo()\n"
"{\n"
" int ret;\n"
" return ret+5;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: ret\n", errout.str());
checkUninitVar("static int foo() {\n"
" int ret;\n"
" return ret = 5;\n"
"}");
ASSERT_EQUALS("", errout.str());
{
checkUninitVar("static int foo() {\n"
" int ret;\n"
" return cin >> ret;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("static int foo() {\n"
" int ret;\n"
" return cin >> ret;\n"
"}\n", "test.c");
ASSERT_EQUALS("[test.c:3]: (error) Uninitialized variable: ret\n", errout.str());
}
// Ticket #2146 - False negative
checkUninitVar("int f(int x) {\n"
" int y;\n"
" return x ? 1 : y;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: y\n", errout.str());
// Ticket #3106 - False positive
{
checkUninitVar("int f() {\n"
" int i;\n"
" return x(&i) ? i : 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int f() {\n"
" int i;\n"
" return x() ? i : 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: i\n", errout.str());
}
// Ticket #5660 - False positive
checkUninitVar("int f() {\n"
" int result;\n"
" int *res[] = {&result};\n"
" foo(res);\n"
" return result;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// strncpy doesn't always null-terminate..
void uninitvar_strncpy() {
checkUninitVar("void f()\n"
"{\n"
" char a[100];\n"
" strncpy(a, s, 20);\n"
" strncat(a, s, 20);\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Dangerous usage of 'a' (strncpy doesn't always null-terminate it).\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char a[100];\n"
" strncpy(a, \"hello\", 3);\n"
" strncat(a, \"world\", 20);\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Dangerous usage of 'a' (strncpy doesn't always null-terminate it).\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char a[100];\n"
" strncpy(a, \"hello\", sizeof(a));\n"
" strncat(a, \"world\", 20);\n"
"}");
ASSERT_EQUALS("", errout.str());
// #3245 - false positive
{
checkUninitVar("void f() {\n"
" char a[100];\n"
" strncpy(a,p,10);\n"
" memcmp(a,q,10);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f() {\n"
" char a[100];\n"
" strncpy(a,p,10);\n"
" if (memcmp(a,q,10)==0);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Using strncpy isn't necessarily dangerous usage
checkUninitVar("void f(const char dev[], char *str) {\n"
" char buf[10];\n"
" strncpy(buf, dev, 10);\n"
" strncpy(str, buf, 10);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f() {\n"
" char dst[4];\n"
" const char* source = \"You\";\n"
" strncpy(dst, source, sizeof(dst));\n"
" char value = dst[2];\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// initialization with memset (not 0-terminating string)..
void uninitvar_memset() {
checkUninitVar("void f() {\n"
" char a[20];\n"
" memset(a, 'a', 20);\n"
" strcat(a, s);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Dangerous usage of 'a' (not null-terminated).\n", errout.str());
}
void uninitvar_memset_nonchar() {
checkUninitVar("void f() {\n"
" int a[20];\n"
" memset(a, 1, 20);\n"
" a[0] |= 2;\n"
"}");
ASSERT_EQUALS(errout.str(), "");
}
void uninitvar_memset_char_access() {
checkUninitVar("void f() {\n"
" unsigned char c[10];\n"
" memset(c, 32, 10);\n"
" unsigned char value = c[3];\n"
"}");
ASSERT_EQUALS(errout.str(), "");
}
std::string analyseFunctions(const char code[]) {
// Clear the error buffer..
errout.str("");
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
std::set<std::string> f;
const CheckUninitVar check((const Tokenizer *)0, (const Settings *)0, (ErrorLogger *)0);
check.analyseFunctions(&tokenizer, f);
std::string ret;
for (std::set<std::string>::const_iterator it = f.begin(); it != f.end(); ++it)
ret += (ret.empty() ? "" : " ") + *it;
return ret;
}
void uninitvar_func() {
// function analysis..
ASSERT_EQUALS("foo", analyseFunctions("void foo(int x) { }"));
ASSERT_EQUALS("foo", analyseFunctions("void foo(int x);"));
ASSERT_EQUALS("foo", analyseFunctions("void foo(const int &x) { }"));
ASSERT_EQUALS("foo", analyseFunctions("void foo(int &x) { ++x; }"));
ASSERT_EQUALS("rename", analyseFunctions("int rename (const char* oldname, const char* newname);")); // Ticket #914
ASSERT_EQUALS("rename", analyseFunctions("int rename (const char oldname[], const char newname[]);"));
ASSERT_EQUALS("", analyseFunctions("void foo(int &x) { x = 0; }"));
ASSERT_EQUALS("", analyseFunctions("void foo(s x) { }"));
// TODO: it's ok to pass a valid pointer to "foo". See #2775 and #2946
TODO_ASSERT_EQUALS("foo", "", analyseFunctions("void foo(Fred *fred) { fred->x = 0; }"));
ASSERT_EQUALS("", analyseFunctions("void foo(int *x) { x[0] = 0; }"));
// function calls..
checkUninitVar("void assignOne(int &x)\n"
"{ x = 1; }\n"
"\n"
"int f()\n"
"{\n"
" int i;\n"
" assignOne(i);\n"
" return i;\n"
"};");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int f(int (*assign)(int *p))\n"
"{\n"
" int i;\n"
" (*assign)(&i);\n"
" return i;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int f()\n"
"{\n"
" char s[10];\n"
" return bar(s);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" FILE *f;\n"
" fflush(f);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: f\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int i;\n"
" x(i+2);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f()\n"
"{\n"
" int i;\n"
" x(i+2);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: i\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char *p = malloc(10);\n"
" read(p + 1);\n"
" return p;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" Abc *p;\n"
" int sz = sizeof(*p);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" Foo *p;\n"
" x = bar(sizeof(*p));\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" Foo *p;\n"
" x = bar(p->begin());\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar("int foo(int x) { return x; }\n"
"void f2()\n"
"{\n"
" int x;\n"
" foo(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("int foo(int x) { return x; }\n"
"void f2()\n"
"{\n"
" int x;\n"
" foo(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar("void foo(const char *s)\n"
"{\n"
" char *p;\n"
" memcpy(p, s, 100);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar("void foo(const char *s)\n"
"{\n"
" char *p = malloc(100);\n"
" memcpy(p, s, 100);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int calc(const int *p, int n);\n"
"void f() {\n"
" int x[10];\n"
" calc(x,10);\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: x\n",
"", errout.str());
// #2401 - unknown function/macro might init the variable
checkUninitVar("int f() {\n"
" int x;\n"
" INIT(x);\n"
" return x;\n"
"}");
ASSERT_EQUALS("", errout.str());
// #3222 - calling function through function pointer
checkUninitVar("char f() {\n"
" char buffer[100];\n"
" (foo.init)(buffer);\n"
" return buffer[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f() {\n" // #3586 - calling template function
" int i;\n"
" a::b<int>(i);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void test() {\n"
" double d;\n"
" double x = dostuff<int>(d);\n"
" return x;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("template <class T> double dostuff(int x, T &y);\n"
"void test() {\n"
" double d;\n"
" a = dostuff<double>(0, d);\n"
"}");
ASSERT_EQUALS("", errout.str());
// using uninitialized function pointer..
checkUninitVar("void foo()\n"
"{\n"
" void (*f)();\n"
" f();\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: f\n", errout.str());
// calling noreturn function..
checkUninitVar("int foo(int a) {\n"
" int x;\n"
" if (a==1)\n"
" g();\n" // might be a noreturn function
" else\n"
" x = 3;\n"
" return x;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int foo(int a) {\n"
" int x;\n"
" if (a==1)\n"
" g(1);\n" // might be a noreturn function
" else\n"
" x = 3;\n"
" return x;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void (*init)(char *str);\n"
"\n"
"char x() {\n"
" char cmd[10];\n"
" init(cmd);\n"
" return cmd[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("char fn(FILE *f) {\n"
" char buf[10];\n"
" fread(buf, 1, 10, f);\n"
"}");
ASSERT_EQUALS("", errout.str());
// #2775 - uninitialized struct pointer in subfunction
checkUninitVar("void a(struct Fred *fred) {\n"
" fred->x = 0;\n"
"}\n"
"\n"
"void b() {\n"
" struct Fred *p;\n"
" a(p);\n"
"}");
// TODO: See #2946
TODO_ASSERT_EQUALS("[test.cpp:7]: (error) Uninitialized variable: p\n", "", errout.str());
// #2946 - FP array is initialized in subfunction
checkUninitVar("void a(char *buf) {\n"
" buf[0] = 0;\n"
"}\n"
"void b() {\n"
" char buf[10];\n"
" a(buf);\n"
" buf[1] = buf[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
// #3159 - initialization by function
checkUninitVar("static int isnumber(const char *arg) {\n"
" char *p;\n"
" return strtod(arg, &p) != 0 || p != arg;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("static int isnumber(const char *arg) {\n"
" char *p;\n"
" return strtod(&arg) != 0 || p != arg;\n"
"}");
TODO_ASSERT_EQUALS("error", "", errout.str());
}
// valid and invalid use of 'int a(int x) { return x + x; }'
void func_uninit_var() {
const std::string funca("int a(int x) { return x + x; }");
checkUninitVar((funca +
"void b() {\n"
" int x;\n"
" a(x);\n"
"}").c_str());
ASSERT_EQUALS("", errout.str());
checkUninitVar2((funca +
"void b() {\n"
" int x;\n"
" a(x);\n"
"}").c_str());
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar((funca +
"void b() {\n"
" int *p;\n"
" a(*p);\n"
"}").c_str());
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: p\n", errout.str());
}
// valid and invalid use of 'void a(int *p) { *p = 0; }'
void func_uninit_pointer() {
const std::string funca("void a(int *p) { *p = 0; }");
// ok - initialized pointer
checkUninitVar((funca +
"void b() {\n"
" int buf[10];\n"
" a(buf);\n"
"}").c_str());
ASSERT_EQUALS("", errout.str());
// not ok - uninitialized pointer
checkUninitVar((funca +
"void b() {\n"
" int *p;\n"
" a(p);\n"
"}").c_str());
ASSERT_EQUALS("", errout.str());
checkUninitVar2((funca +
"void b() {\n"
" int *p;\n"
" a(p);\n"
"}").c_str());
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: p\n", errout.str());
}
void uninitvar_typeof() {
checkUninitVar2("void f() {\n"
" struct Fred *fred;\n"
" typeof(fred->x);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" struct SData * s;\n"
" ab(typeof(s->status));\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f() {\n"
" struct SData * s;\n"
" TYPEOF(s->status);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f() {\n"
" #define w(x) ({ x z; (x*)z; })\n"
" int *n = w(typeof(*n));\n"
"}");
ASSERT_EQUALS("", errout.str());
}
/** New checking that doesn't rely on ExecutionPath */
void checkUninitVar2(const char code[], const char fname[] = "test.cpp", bool verify=true, bool debugwarnings=false) {
// Clear the error buffer..
errout.str("");
// Tokenize..
Settings settings1(settings);
settings1.inconclusive = true;
settings1.standards.posix = true;
settings1.experimental = true;
settings1.debugwarnings = debugwarnings;
Tokenizer tokenizer(&settings1, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, fname);
const std::string str1(tokenizer.tokens()->stringifyList(0,true));
tokenizer.simplifyTokenList2();
const std::string str2(tokenizer.tokens()->stringifyList(0,true));
if (verify && str1 != str2)
warnUnsimplified(str1, str2);
// Check for redundant code..
CheckUninitVar checkuninitvar(&tokenizer, &settings1, this);
checkuninitvar.testrunner = true;
checkuninitvar.check();
}
void uninitvar2() {
// using uninit var
checkUninitVar2("void f() {\n"
" int x;\n"
" x++;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar2("void f() {\n"
" int x;\n"
" str[x] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar2("void f() {\n"
" int x;\n"
" int y = x & 3;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar2("void f() {\n"
" int x;\n"
" int y = 3 & x;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar2("void f() {\n"
" int x;\n"
" x = 3 + x;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar2("int f() {\n"
" int x;\n"
" x = x;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar2("void f() {\n"
" struct ABC *abc;\n"
" abc->a = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: abc\n", errout.str());
checkUninitVar2("int f() {\n"
" static int x;\n"
" return ++x;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("int f() {\n"
" extern int x;\n"
" return ++x;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n" // #3926 - weird cast.
" int x;\n"
" *(((char *)&x) + 0) = 0;\n"
"}", "test.c", false);
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n" // #4737 - weird cast.
" int x;\n"
" do_something(&((char*)&x)[0], 1);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" int x;\n"
" char *p = (char*)&x + 1;\n"
"}", "test.cpp", false); // verify=false (the cast is removed but we don't care)
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" int i;\n"
" i=f(), i!=2;\n"
"}");
ASSERT_EQUALS("", errout.str());
// using uninit var in condition
checkUninitVar2("void f(void) {\n"
" int x;\n"
" if (x) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar2("void f() {\n"
" int x;\n"
" if (1 == (3 & x)) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str());
// ?:
checkUninitVar2("int f(int *ptr) {\n"
" int a;\n"
" int *p = ptr ? ptr : &a;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("int f(int a) {\n"
" int x;\n"
" if (a==3) { x=2; }\n"
" y = (a==3) ? x : a;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("int f(int a) {\n"
" int result;\n"
" foo() ? result = 1 : result = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
// = { .. }
checkUninitVar2("int f() {\n"
" int a;\n"
" int *p[] = { &a };\n"
" *p[0] = 0;\n"
" return a;\n"
"}");
ASSERT_EQUALS("", errout.str());
// = ({ .. })
checkUninitVar2("void f() {\n"
" int x = ({ 1 + 2; });\n"
" int y = 1 + (x ? y : y);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: y\n", errout.str());
// >> => initialization / usage
{
const char code[] = "void f() {\n"
" int x;\n"
" if (i >> x) { }\n"
"}";
checkUninitVar2(code, "test.cpp");
ASSERT_EQUALS("", errout.str());
checkUninitVar2(code, "test.c");
ASSERT_EQUALS("[test.c:3]: (error) Uninitialized variable: x\n", errout.str());
}
checkUninitVar2("void f() {\n"
" int i, i2;\n"
" strm >> i >> i2;\n"
"}");
ASSERT_EQUALS("", errout.str());
// unconditional initialization
checkUninitVar2("int f() {\n"
" int ret;\n"
" if (a) { ret = 1; }\n"
" else { {} ret = 2; }\n"
" return ret;\n"
"}");
ASSERT_EQUALS("", errout.str());
// conditional initialization
checkUninitVar2("void f() {\n"
" int x;\n"
" if (y == 1) { x = 1; }\n"
" else { if (y == 2) { x = 1; } }\n"
" return x;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar2("void f() {\n"
" int x;\n"
" if (y == 1) { x = 1; }\n"
" else { if (y == 2) { x = 1; } }\n"
" if (y == 3) { }\n" // <- ignore condition
" return x;\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: x\n", errout.str());
// initialization in condition
checkUninitVar2("void f() {\n"
" int a;\n"
" if (init(&a)) { }\n"
" a++;\n"
"}");
ASSERT_EQUALS("", errout.str());
// return, break, continue, goto
checkUninitVar2("void f() {\n"
" int x;\n"
" if (y == 1) { return; }\n"
" else { x = 1; }\n"
" return x;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" int x;\n"
" if (y == 1) { return; }\n"
" return x;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar2("int f(int x) {\n"
" int ret;\n"
" if (!x) {\n"
" ret = -123;\n"
" goto out1;\n"
" }\n"
" return 0;\n"
"out1:\n"
"out2:\n"
" return ret;\n"
"}", "test.c", false);
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" int i;\n"
" if (x) {\n"
" i = 1;\n"
" } else {\n"
" goto out;\n"
" }\n"
" i++;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("int f() {\n"
" int i,x;\n"
" for (i=0;i<9;++i)\n"
" if (foo) break;\n"
" return x;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar2("int f() {\n"
" int x;\n"
" while (foo)\n"
" if (bar) break;\n"
" return x;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: x\n", errout.str());
// try/catch : don't warn about exception variable
checkUninitVar2("void f() {\n"
" try {\n"
" } catch (CException* e) {\n"
" trace();\n"
" e->Delete();\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n" // #5347
" try {\n"
" } catch (const char* e) {\n"
" A a = e;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
// exit
checkUninitVar2("void f() {\n"
" int x;\n"
" if (y == 1) { exit(0); }\n"
" else { x = 1; }\n"
" return x;\n"
"}");
ASSERT_EQUALS("", errout.str());
// strange code.. don't crash (#3415)
checkUninitVar2("void foo() {\n"
" int i;\n"
" ({ if (0); });\n"
" for_each(i) { }\n"
"}", "test.c", false);
ASSERT_EQUALS("", errout.str());
// if, if
checkUninitVar2("void f(int a) {\n"
" int i;\n"
" if (a) i = 0;\n"
" if (a) i++;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" int a,b=0;\n"
" if (x) {\n"
" if (y) {\n"
" a = 0;\n"
" b = 1;\n"
" }\n"
" }\n"
" if (b) a++;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" int a=0, b;\n"
" if (x) { }\n"
" else { if (y==2) { a=1; b=2; } }\n"
" if (a) { ++b; }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("static void f(int x, int y) {\n"
" int a;\n"
" if (x == 0) { a = y; }\n"
" if (x == 0 && (a == 1)) { }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("static void f() {\n"
" int a=0, b;\n"
" if (something) { a = dostuff(&b); }\n"
" if (!a || b) { }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("static void f(int x, int y) {\n"
" int a;\n"
" if (x == 0 && (a == 1)) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar2("void f() {\n"
" int a;\n"
" if (x) { a = 0; }\n"
" if (x) { if (y) { a++; } }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" int a;\n"
" if (x) { a = 0; }\n"
" if (x) { if (y) { } else { a++; } }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("struct AB { int a; int b; };\n"
"void f(void) {\n"
" struct AB ab;\n"
" if (x) ab = getAB();\n"
" else ab.a = 0;\n"
" if (ab.a == 1) b = ab.b;\n"
"}", "test.c");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("int f(void) {\n"
" int a;\n"
" int i;\n"
" if (x) { noreturn(); }\n"
" else { i = 0; }\n"
" if (i==1) { a = 0; }\n"
" else { a = 1; }\n"
" return a;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("int f(int a) {\n" // #4560
" int x = 0, y;\n"
" if (a) x = 1;\n"
" else return 0;\n"
" if (x) y = 123;\n" // <- y is always initialized
" else {}\n"
" return y;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("int f(int a) {\n" // #4560
" int x = 1, y;\n"
" if (a) x = 0;\n"
" else return 0;\n"
" if (x) {}\n"
" else y = 123;\n" // <- y is always initialized
" return y;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("static int x;" // #4773
"int f() {\n"
" int y;\n"
" if (x) g();\n"
" if (x) y = 123;\n"
" else y = 456;\n"
" return y;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("static int x;" // #4773
"int f() {\n"
" int y;\n"
" if (!x) g();\n"
" if (x) y = 123;\n"
" else y = 456;\n"
" return y;\n"
"}");
ASSERT_EQUALS("", errout.str());
// asm
checkUninitVar2("void f() {\n"
" int x;\n"
" asm();\n"
" x++;\n"
"}");
ASSERT_EQUALS("", errout.str());
// sizeof / typeof / offsetof / etc
checkUninitVar2("void f() {\n"
" int i;\n"
" sizeof(i+1);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" int i;\n"
" if (100 == sizeof(i+1));\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" struct ABC *abc;\n"
" int i = ARRAY_SIZE(abc.a);"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" int *abc;\n"
" typeof(*abc);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" struct ABC *abc;\n"
" return do_something(typeof(*abc));\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" A *a;\n"
" a = malloc(sizeof(*a));\n"
"}");
ASSERT_EQUALS("", errout.str());
// Ticket #3890 - False positive for std::map
checkUninitVar2("void f() {\n"
" std::map<int,bool> x;\n"
" return x;\n"
"}");
ASSERT_EQUALS("", errout.str());
// Ticket #3906 - False positive for std::vector pointer
checkUninitVar2("void f() {\n"
" std::vector<int> *x = NULL;\n"
" return x;\n"
"}", "test.cpp", false);
ASSERT_EQUALS("", errout.str());
// &
checkUninitVar2("void f() {\n" // #4426 - address of uninitialized variable
" int a,b;\n"
" if (&a == &b);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n" // #4439 - cast address of uninitialized variable
" int a;\n"
" x((A)(B)&a);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n" // #4778 - cast address of uninitialized variable
" long a;\n"
" &a;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n" // #4717 - ({})
" int a = ({ long b = (long)(123); 2 + b; });\n"
"}", "test.c", false);
ASSERT_EQUALS("", errout.str());
}
// #3869 - reference variable
void uninitvar4() {
checkUninitVar2("void f() {\n"
" int buf[10];\n"
" int &x = buf[0];\n"
" buf[0] = 0;\n"
" x++;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// #3861
void uninitvar5() {
// ensure there is no false positive
checkUninitVar2("void f() {\n"
" x<char> c;\n"
" c << 2345;\n"
"}");
ASSERT_EQUALS("", errout.str());
// ensure there is no false negative
checkUninitVar2("void f() {\n"
" char c;\n"
" char a = c << 2;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: c\n", errout.str());
// #4320
checkUninitVar2("void f() {\n"
" int a;\n"
" a << 1;\n" // there might be a operator<<
"}");
ASSERT_EQUALS("", errout.str());
}
// Handling of unknown types. Assume they are POD in C.
void uninitvar6() {
const char code[] = "void f() {\n"
" dfs a;\n"
" return a;\n"
"}";
// Assume dfs is a non POD type if file is C++
checkUninitVar2(code, "test.cpp");
ASSERT_EQUALS("", errout.str());
// Assume dfs is a POD type if file is C
checkUninitVar2(code, "test.c");
ASSERT_EQUALS("[test.c:3]: (error) Uninitialized variable: a\n", errout.str());
const char code2[] = "struct AB { int a,b; };\n"
"void f() {\n"
" struct AB ab;\n"
" return ab;\n"
"}";
checkUninitVar2(code2, "test.cpp");
ASSERT_EQUALS("", errout.str());
checkUninitVar2(code2, "test.c");
ASSERT_EQUALS("[test.c:4]: (error) Uninitialized variable: ab\n", errout.str());
}
void uninitvar7() {
const char code[] = "void eDBauth_user() {\n"
" char *blid_cert;\n"
" if( ) {\n"
" blid_cert = ;\n"
" } \n"
"}\n";
// Assume dfs is a non POD type if file is C++
checkUninitVar2(code, "test.cpp");
}
void uninitvar8() {
const char code[] = "struct Fred {\n"
" void Sync(dsmp_t& type, int& len, int limit = 123);\n"
" void Sync(int& syncpos, dsmp_t& type, int& len, int limit = 123);\n"
" void FindSyncPoint();\n"
"};\n"
"void Fred::FindSyncPoint() {\n"
" dsmp_t type;\n"
" int syncpos, len;\n"
" Sync(syncpos, type, len);\n"
"}";
checkUninitVar2(code, "test.cpp");
ASSERT_EQUALS("", errout.str());
}
// Handling of function calls
void uninitvar2_func() {
// non-pointer variable
checkUninitVar2("void a(char);\n" // value => error
"void b() {\n"
" char c;\n"
" a(c);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: c\n", errout.str());
checkUninitVar2("void a(char c);\n" // value => error
"void b() {\n"
" char c;\n"
" a(c);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: c\n", errout.str());
checkUninitVar2("void a(const char c);\n" // const value => error
"void b() {\n"
" char c;\n"
" a(c);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: c\n", errout.str());
checkUninitVar2("void a(char *c);\n" // address => no error
"void b() {\n"
" char c;\n"
" a(&c);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void a(pstr s);\n" // address => no error
"void b() {\n"
" char c;\n"
" a(&c);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void a(const char *c);\n" // const address => error
"void b() {\n"
" char c;\n"
" a(&c);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: c\n", errout.str());
// pointer variable
checkUninitVar2("void a(char c);\n" // value => error
"void b() {\n"
" char *c;\n"
" a(*c);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: c\n", errout.str());
checkUninitVar2("void a(const char c);\n" // const value => error
"void b() {\n"
" char c;\n"
" a(*c);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: c\n", errout.str());
checkUninitVar2("void a(char *c);\n" // address => error
"void b() {\n"
" char *c;\n"
" a(c);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: c\n", errout.str());
checkUninitVar2("typedef struct { int a; int b; } AB;\n"
"void a(AB *ab);\n"
"void b() {\n"
" AB *ab;\n"
" a(ab);\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: ab\n", errout.str());
checkUninitVar2("void a(const char *c);\n" // const address => error
"void b() {\n"
" char *c;\n"
" a(c);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: c\n", errout.str());
checkUninitVar2("void a(const char c[]);\n" // const address => error
"void b() {\n"
" char *c;\n"
" a(c);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: c\n", errout.str());
checkUninitVar2("void a(char **c);\n" // address of pointer => no error
"void b() {\n"
" char *c;\n"
" a(&c);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void a(char *c);\n" // address of pointer (suspicious cast to pointer) => no error
"void b() {\n"
" char *c;\n"
" a(&c);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void a(const char **c);\n" // const address of pointer => no error
"void b() {\n"
" const char *c;\n"
" a(&c);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("struct ABC { int a; };\n" // struct initialization
"void clear(struct ABC &abc);\n"
"int f() {\n"
" struct ABC abc;\n"
" clear(abc);\n"
" return abc.a;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void uninitvar2_value() {
checkUninitVar2("void f() {\n"
" int i;\n"
" if (x) {\n"
" int y = -ENOMEM;\n" // assume constant ENOMEM is nonzero since it's negated
" if (y != 0) return;\n"
" i++;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" int i, y;\n"
" if (x) {\n"
" y = -ENOMEM;\n" // assume constant ENOMEM is nonzero since it's negated
" if (y != 0) return;\n"
" i++;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" int i, y;\n"
" if (x) y = -ENOMEM;\n" // assume constant ENOMEM is nonzero since it's negated
" else y = get_value(i);\n"
" if (y != 0) return;\n" // <- condition is always true if i is uninitialized
" i++;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f(int x) {\n"
" int i;\n"
" if (!x) i = 0;\n"
" if (!x || i>0) {}\n" // <- error
"}");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: i\n", "", errout.str());
checkUninitVar2("void f(int x) {\n"
" int i;\n"
" if (x) i = 0;\n"
" if (!x || i>0) {}\n" // <- no error
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f(int x) {\n"
" int i;\n"
" if (!x) { }\n"
" else i = 0;\n"
" if (x || i>0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: i\n", errout.str());
checkUninitVar2("void f(int x) {\n"
" int i;\n"
" if (x) { }\n"
" else i = 0;\n"
" if (x || i>0) {}\n" // <- no error
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("int f(int x) {\n"
" int y;\n"
" if (x) y = do_something();\n"
" if (!x) return 0;\n"
" return y;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("int f(int x) {\n" // FP with ?:
" int a;\n"
" if (x)\n"
" a = p;\n"
" return x ? 2*a : 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// TODO: False negative when "?:" is used
// This should probably be fixed in the tokenizer by changing
// "return x?y:z;" to "if(x)return y;return z;"
checkUninitVar2("int f(int x) {\n"
" int a;\n"
" if (x)\n"
" a = p;\n"
" return y ? 2*a : 3*a;\n"
"}\n");
TODO_ASSERT_EQUALS("error", "", errout.str());
// Unknown => bail out..
checkUninitVar2("void f(int x) {\n"
" int i;\n"
" if (a(x)) i = 0;\n"
" if (b(x)) return;\n"
" i++;\n" // <- no error if b(x) is always true when a(x) is false
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f(int x) {\n"
" int i;\n"
" if (x) i = 0;\n"
" while (condition) {\n"
" if (x) i++;\n" // <- no error
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f(int x) {\n"
" int i;\n"
" if (x) i = 0;\n"
" while (condition) {\n"
" i++;\n"
" }\n"
"}");
TODO_ASSERT_EQUALS("error", "", errout.str());
}
void uninitvar2_structmembers() { // struct members
checkUninitVar2("struct AB { int a; int b; };\n"
"void f(void) {\n"
" struct AB ab;\n"
" int a = ab.a;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized struct member: ab.a\n", errout.str());
checkUninitVar2("struct AB { int a; int b; };\n"
"void f(void) {\n"
" struct AB ab;\n"
" ab.a = ab.a + 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized struct member: ab.a\n", errout.str());
checkUninitVar2("struct AB { int a; int b; };\n"
"void do_something(const struct AB ab);\n"
"void f(void) {\n"
" struct AB ab;\n"
" ab.a = 0;\n"
" do_something(ab);\n"
"}\n", "test.c");
ASSERT_EQUALS("[test.c:6]: (error) Uninitialized struct member: ab.b\n", errout.str());
checkUninitVar2("struct AB { int a; int b; };\n"
"void f(void) {\n"
" struct AB ab;\n"
" int a = ab.a;\n"
"}\n", "test.c");
ASSERT_EQUALS("[test.c:4]: (error) Uninitialized struct member: ab.a\n", errout.str());
checkUninitVar2("struct AB { int a; int b; };\n"
"void f(void) {\n"
" struct AB ab;\n"
" buf[ab.a] = 0;\n"
"}\n", "test.c");
ASSERT_EQUALS("[test.c:4]: (error) Uninitialized struct member: ab.a\n", errout.str());
checkUninitVar2("struct AB { int a; int b; };\n"
"void f(void) {\n"
" struct AB ab;\n"
" ab.a = 1;\n"
" x = ab;\n"
"}\n", "test.c");
ASSERT_EQUALS("[test.c:5]: (error) Uninitialized struct member: ab.b\n", errout.str());
checkUninitVar2("struct AB { int a; int b; };\n"
"void f(void) {\n"
" struct AB ab;\n"
" ab.a = 1;\n"
" x = *(&ab);\n"
"}\n", "test.c");
ASSERT_EQUALS("[test.c:5]: (error) Uninitialized struct member: ab.b\n", errout.str());
checkUninitVar2("class Element {\n"
" static void f() { }\n"
"};\n"
"void test() {\n"
" Element *element; element->f();\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: element\n", errout.str());
checkUninitVar2("class Element {\n"
" static void f() { }\n"
"};\n"
"void test() {\n"
" Element *element; (*element).f();\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: element\n", errout.str());
checkUninitVar2("class Element {\n"
" static int v;\n"
"};\n"
"void test() {\n"
" Element *element; element->v;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: element\n", errout.str());
checkUninitVar2("class Element {\n"
" static int v;\n"
"};\n"
"void test() {\n"
" Element *element; (*element).v;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: element\n", errout.str());
checkUninitVar2("class Element {\n"
" void f() { }\n"
"};\n"
"void test() {\n"
" Element *element; element->f();\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: element\n", errout.str());
checkUninitVar2("class Element {\n"
" void f() { }\n"
"};\n"
"void test() {\n"
" Element *element; (*element).f();\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: element\n", errout.str());
checkUninitVar2("class Element {\n"
" int v;\n"
"};\n"
"void test() {\n"
" Element *element; element->v;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: element\n", errout.str());
checkUninitVar2("class Element {\n"
" int v;\n"
"};\n"
"void test() {\n"
" Element *element; (*element).v;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: element\n", errout.str());
checkUninitVar2("struct AB { int a; int b; };\n" // pass struct member by address
"void f(void) {\n"
" struct AB ab;\n"
" assign(&ab.a, 0);\n"
"}\n", "test.c");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("struct AB { int a; int b; };\n"
"void do_something(const struct AB ab);\n"
"void f(void) {\n"
" struct AB ab;\n"
" ab.a = 0;\n"
" ab.b = 0;\n"
" do_something(ab);\n"
"}\n", "test.c");
ASSERT_EQUALS("", errout.str());
{
checkUninitVar2("void f(void) {\n"
" struct AB ab;\n"
" strcpy(ab.a, STR);\n"
"}\n", "test.c");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f(void) {\n"
" struct AB ab;\n"
" strcpy(x, ab.a);\n"
"}\n", "test.c");
TODO_ASSERT_EQUALS("error", "", errout.str());
checkUninitVar2("struct AB { int a; };\n"
"void f(void) {\n"
" struct AB ab;\n"
" dosomething(ab.a);\n"
"}\n", "test.c");
TODO_ASSERT_EQUALS("error","", errout.str());
}
checkUninitVar2("struct AB { int a; int b; };\n"
"void do_something(const struct AB ab);\n"
"void f(void) {\n"
" struct AB ab;\n"
" ab = getAB();\n"
" do_something(ab);\n"
"}\n", "test.c");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("struct AB { int a; struct { int b; int c; } s; };\n"
"void do_something(const struct AB ab);\n"
"void f(void) {\n"
" struct AB ab;\n"
" ab.a = 1;\n"
" ab.s.b = 2;\n"
" ab.s.c = 3;\n"
" do_something(ab);\n"
"}\n", "test.c");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("struct conf {\n"
" char x;\n"
"};\n"
"\n"
"void do_something(struct conf ant_conf);\n"
"\n"
"void f(void) {\n"
" struct conf c;\n"
" initdata(&c);\n"
" do_something(c);\n"
"}\n", "test.c");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("struct PIXEL {\n"
" union {\n"
" struct { unsigned char red,green,blue,alpha; };\n"
" unsigned int color;\n"
" };\n"
"};\n"
"\n"
"unsigned char f() {\n"
" struct PIXEL p1;\n"
" p1.color = 255;\n"
" return p1.red;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("struct AB { int a; int b; };\n"
"int f() {\n"
" struct AB *ab;\n"
" for (i = 1; i < 10; i++) {\n"
" if (condition && (ab = getab()) != NULL) {\n"
" a = ab->a;\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("struct AB { int a; int b; };\n"
"int f(int x) {\n"
" struct AB *ab;\n"
" if (x == 0) {\n"
" ab = getab();\n"
" }\n"
" if (x == 0 && (ab != NULL || ab->a == 0)) { }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("struct A { int *x; };\n" // declarationId is 0 for "delete"
"void foo(void *info, void*p);\n"
"void bar(void) {\n"
" struct A *delete = 0;\n"
" foo( info, NULL );\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("struct ABC { int a; int b; int c; };\n"
"void foo(int x, const struct ABC *abc);\n"
"void bar(void) {\n"
" struct ABC abc;\n"
" foo(123, &abc);\n"
" return abc.b;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized struct member: abc.a\n"
"[test.cpp:5]: (error) Uninitialized struct member: abc.b\n"
"[test.cpp:6]: (error) Uninitialized struct member: abc.b\n"
"[test.cpp:5]: (error) Uninitialized struct member: abc.c\n", errout.str());
// return
checkUninitVar2("struct AB { int a; int b; };\n"
"void f(void) {\n"
" struct AB ab;\n"
" ab.a = 0;\n"
" return ab.b;\n"
"}\n", "test.c");
ASSERT_EQUALS("[test.c:5]: (error) Uninitialized struct member: ab.b\n", errout.str());
checkUninitVar2("struct AB { int a; int b; };\n"
"void f(void) {\n"
" struct AB ab;\n"
" ab.a = 0;\n"
" return ab.a;\n"
"}\n", "test.c");
ASSERT_EQUALS("", errout.str());
// checkIfForWhileHead
checkUninitVar2("struct FRED {\n"
" int a;\n"
" int b;\n"
"};\n"
"\n"
"void f(void) {\n"
" struct FRED fred;\n"
" fred.a = do_something();\n"
" if (fred.a == 0) { }\n"
"}\n", "test.c");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("struct FRED {\n"
" int a;\n"
" int b;\n"
"};\n"
"\n"
"void f(void) {\n"
" struct FRED fred;\n"
" fred.a = do_something();\n"
" if (fred.b == 0) { }\n"
"}\n", "test.c");
ASSERT_EQUALS("[test.c:9]: (error) Uninitialized struct member: fred.b\n", errout.str());
checkUninitVar2("struct Fred { int a; };\n"
"void f() {\n"
" struct Fred fred;\n"
" if (fred.a==1) {}\n"
"}", "test.c");
ASSERT_EQUALS("[test.c:4]: (error) Uninitialized struct member: fred.a\n", errout.str());
checkUninitVar2("struct S { int n; int m; };\n"
"void f(void) {\n"
" struct S s;\n"
" for (s.n = 0; s.n <= 10; s.n++) { }\n"
"}", "test.c");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void test2() {\n"
" struct { char type; } s_d;\n"
" if (foo(&s_d.type)){}\n"
"}");
ASSERT_EQUALS("", errout.str());
// for
checkUninitVar2("struct AB { int a; };\n"
"void f() {\n"
" struct AB ab;\n"
" while (x) { clear(ab); z = ab.a; }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("struct AB { int a; };\n"
"void f() {\n"
" struct AB ab;\n"
" while (x) { ab.a = ab.a + 1; }\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized struct member: ab.a\n", errout.str());
// address of member
checkUninitVar2("struct AB { int a[10]; int b; };\n"
"void f() {\n"
" struct AB ab;\n"
" int *p = ab.a;\n"
"}");
ASSERT_EQUALS("", errout.str());
// non static data-member initialization
checkUninitVar2("struct AB { int a=1; int b; };\n"
"void f(void) {\n"
" struct AB ab;\n"
" int a = ab.a;\n"
" int b = ab.b;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized struct member: ab.b\n", errout.str());
}
void uninitvar2_while() {
// for, while
checkUninitVar2("void f() {\n"
" int x;\n"
" while (a) {\n"
" x = x + 1;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar2("void f() {\n"
" int x;\n"
" do {\n"
" x = x + 1;\n"
" } while (a);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar2("void f() {\n"
" for (int x = x; x < 10; x++) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar2("void f() {\n"
" for (Element *ptr3 = ptr3->Next(); ptr3; ptr3 = ptr3->Next()) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Uninitialized variable: ptr3\n", errout.str());
checkUninitVar2("void f() {\n" // #4911 - bad simplification => don't crash
" int a;\n"
" do { a=do_something() } while (a);\n"
"}\n", "test.cpp", /*verify=*/true, /*debugwarnings=*/true);
ASSERT_EQUALS("[test.cpp:3]: (debug) ValueFlow bailout: variable a stopping on }\n", errout.str());
checkUninitVar2("void f() {\n"
" int x;\n"
" while (a) {\n"
" init(&x);\n"
" x++;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" int x;\n"
" while (a) {\n"
" if (b) x++;\n"
" else x = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" int x;\n"
" for (int i = 0; i < 10; i += x) {\n"
" x = y;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" int x;\n"
" for (int i = 0; i < 10; i += x) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar2("int f() {\n"
" int i;\n"
" for (i=0;i<9;++i)\n"
" if (foo()) return i;\n"
" return 9;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" int i;\n"
" do {} while (!getvalue(&i));\n"
" i++;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2(">{ x while (y) z int = }"); // #4175 : don't crash
checkUninitVar2("int f(void) {\n"
" int x;\n"
" while (a()) {\n" // <- condition must always be true or there will be problem
" if (b()) {\n"
" x = 1;\n"
" break;"
" }\n"
" }\n"
" return x;\n"
"}\n");
TODO_ASSERT_EQUALS("error", "", errout.str());
checkUninitVar2("int f(void) {\n"
" int x;\n"
" while (a()) {\n"
" if (b() && (x=1)) {\n"
" return x;\n"
" }\n"
" }\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f(void) {\n"
" int x;\n"
" for (;;) {\n"
" int a = x+1;\n"
" do_something(a);\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar2("struct AB {int a; int b;};\n"
"void f(void) {\n"
" struct AB ab;\n"
" while (true) {\n"
" int a = 1+ab.a;\n"
" do_something(a);\n"
" }\n"
"}\n", "test.c");
ASSERT_EQUALS("[test.c:5]: (error) Uninitialized variable: ab\n"
"[test.c:5]: (error) Uninitialized struct member: ab.a\n", errout.str());
checkUninitVar2("void f(int i) {\n" // #4569 fp
" float *buffer;\n"
" if(i>10) buffer = f;\n"
" if(i>10) {\n"
" for (int i=0;i<10;i++)\n"
" buffer[i] = 0;\n" // <- fp
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f(){\n" // #4519 - fp: inline assembler in loop
" int x;\n"
" for (int i = 0; i < 10; i++) {\n"
" asm(\"foo\");\n"
" if (x & 0xf1) { }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("static void f(void) {\n"
" struct ABC *abc;\n"
" for (i = 0; i < 10; i++)\n"
" x += sizeof(*abc);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f(void) {\n" // #4879
" int i;\n"
" while (x) {\n"
" for (i = 0; i < 5; i++)\n"
" a[i] = b[i];\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f(void) {\n" // #5658
" struct Foo *foo;\n"
" while (true) {\n"
" foo = malloc(sizeof(*foo));\n"
" foo->x = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f(void) {\n"
" int i;\n"
" while (x) {\n"
" for (i=0,y=i;;){}\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void uninitvar2_4494() {
checkUninitVar2("namespace N1 {\n"
" class Fred {\n"
" public:\n"
" static void f1(char *p) { *p = 0; }\n"
" };\n"
" void fa(void) { char *p; Fred::f1(p); }\n"
" void fb(void) { char *p; Fred::f2(p); }\n"
" void fc(void) { char *p; ::N1::Fred::f1(p); }\n"
" void fd(void) { char *p; ::N1::Fred::f2(p); }\n"
"}\n"
"namespace N2 {\n"
" static void f1(char *p) { *p = 0; }\n"
" void fa(void) { char *p; f1(p); }\n"
" void fb(void) { char *p; f2(p); }\n"
" void fc(void) { char *p; N1::Fred::f1(p); }\n"
" void fd(void) { char *p; N1::Fred::f2(p); }\n"
" void fe(void) { char *p; ::N1::Fred::f1(p); }\n"
" void ff(void) { char *p; ::N1::Fred::f2(p); }\n"
" void fg(void) { char *p; Foo::f1(p); }\n"
" void fh(void) { char *p; Foo::f2(p); }\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: p\n"
"[test.cpp:8]: (error) Uninitialized variable: p\n"
"[test.cpp:13]: (error) Uninitialized variable: p\n"
"[test.cpp:15]: (error) Uninitialized variable: p\n"
"[test.cpp:17]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar2("class Fred {\n"
"public:\n"
" void f1(char *p) { *p = 0; }\n"
"};\n"
"Fred fred;\n"
"void f(void) {\n"
" char *p;\n"
" fred.f1(p);\n"
"}");
ASSERT_EQUALS("[test.cpp:8]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar2("class Fred {\n"
"public:\n"
" class Wilma {\n"
" public:\n"
" class Barney {\n"
" public:\n"
" class Betty {\n"
" public:\n"
" void f1(char *p) { *p = 0; }\n"
" };\n"
" Betty betty;\n"
" };\n"
" Barney barney;\n"
" };\n"
" Wilma wilma;\n"
"};\n"
"Fred fred;\n"
"void f(void) {\n"
" char *p;\n"
" fred.wilma.barney.betty.f1(p);\n"
"}");
ASSERT_EQUALS("[test.cpp:20]: (error) Uninitialized variable: p\n", errout.str());
}
void uninitvar2_malloc() {
checkUninitVar2("int f() {\n"
" int *p = malloc(40);\n"
" return *p;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Memory is allocated but not initialized: p\n", errout.str());
checkUninitVar2("int f() {\n"
" int *p = malloc(40);\n"
" var = *p;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Memory is allocated but not initialized: p\n", errout.str());
checkUninitVar2("struct AB { int a; int b; };\n"
"int f() {\n"
" struct AB *ab = malloc(sizeof(struct AB));\n"
" return ab->a;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory is allocated but not initialized: ab\n"
"[test.cpp:4]: (error) Uninitialized struct member: ab.a\n",
errout.str());
checkUninitVar2("struct t_udf_file { int dir_left; };\n"
"\n"
"void f() {\n"
" struct t_udf_file *newf;\n"
" newf = malloc(sizeof(*newf));\n"
" if (!newf) return 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" char *s = malloc(100);\n"
" if (s != NULL) { }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" char *s = malloc(100);\n"
" *s = x;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" char *p = malloc(100);\n"
" p || assert_failed();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f() {\n"
" char *p = malloc(100);\n"
" x = p;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// function parameter (treat it as initialized until malloc is used)
checkUninitVar2("int f(int *p) {\n"
" if (*p == 1) {}\n" // no error
" p = malloc(256);\n"
" return *p;\n" // error
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory is allocated but not initialized: p\n", errout.str());
checkUninitVar2("struct AB { int a; int b; };\n"
"int f(struct AB *ab) {\n"
" if (ab->a == 1) {}\n" // no error
" ab = malloc(sizeof(struct AB));\n"
" return ab->a;\n" // error
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized struct member: ab.a\n", errout.str());
checkUninitVar2("struct AB { int a; int b; };\n"
"void do_something(struct AB *ab);\n" // unknown function
"int f() {\n"
" struct AB *ab = malloc(sizeof(struct AB));\n"
" do_something(ab);\n"
"}");
ASSERT_EQUALS("", errout.str());
// analysis failed. varid 0.
checkUninitVar2("void *vlc_custom_create (vlc_object_t *parent, size_t length, const char *typename) {\n"
" assert (length >= sizeof (vlc_object_t));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void syntax_error() { // Ticket #5073
// Nominal mode => No output
checkUninitVar2("struct flex_array {};\n"
"struct cgroup_taskset {};\n"
"void cgroup_attach_task() {\n"
" struct flex_array *group;\n"
" struct cgroup_taskset tset = { };\n"
" do { } while_each_thread(leader, tsk);\n"
"}", "test.cpp", /*verify=*/true, /*debugwarnings=*/false);
ASSERT_EQUALS("", errout.str());
// --debug-warnings mode => Debug warning
checkUninitVar2("struct flex_array {};\n"
"struct cgroup_taskset {};\n"
"void cgroup_attach_task() {\n"
" struct flex_array *group;\n"
" struct cgroup_taskset tset = { };\n"
" do { } while_each_thread(leader, tsk);\n"
"}", "test.cpp", /*verify=*/true, /*debugwarnings=*/true);
ASSERT_EQUALS("[test.cpp:6]: (debug) assertion failed '} while ('\n", errout.str());
}
// Test that the btowc function, defined in std.cfg is configured correctly.
void stdcfg_btowc() {
checkUninitVar2("wchar_t f() { int i; return btowc(i); }");
ASSERT_EQUALS("[test.cpp:1]: (error) Uninitialized variable: i\n", errout.str());
checkUninitVar2("wchar_t f(int i) { return btowc(i); }");
ASSERT_EQUALS("", errout.str());
}
// Test that the clearerr function, defined in std.cfg is configured correctly.
void stdcfg_clearerr() {
checkUninitVar("void f() {\n"
" FILE * pFile;\n"
" clearerr (pFile);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: pFile\n", errout.str());
checkUninitVar2("void f(FILE * pFile) {\n"
" clearerr (pFile);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Test that the fclose function, defined in std.cfg is configured correctly.
void stdcfg_fclose() {
checkUninitVar("void f() {\n"
" FILE * pFile;\n"
" fclose (pFile);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: pFile\n", errout.str());
checkUninitVar2("void f(FILE * pFile) {\n"
" fclose (pFile);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Test that the fopen function, defined in std.cfg is configured correctly.
void stdcfg_fopen() {
checkUninitVar("void f() {\n"
" char * filename;\n"
" fopen (filename, \"w\");\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: filename\n", errout.str());
checkUninitVar("void f() {\n"
" char * filename;\n"
" char * mode;\n"
" fopen (filename, mode);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: filename\n"
"[test.cpp:4]: (error) Uninitialized variable: mode\n", errout.str());
checkUninitVar2("void f(FILE * name, char *mode) {\n"
" fopen (name, mode);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Test that the feof function, defined in std.cfg is configured correctly.
void stdcfg_feof() {
checkUninitVar("void f() {\n"
" FILE * pFile;\n"
" feof (pFile);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: pFile\n", errout.str());
checkUninitVar2("void f(FILE * pFile) {\n"
" feof (pFile);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Test that the ferror function, defined in std.cfg is configured correctly.
void stdcfg_ferror() {
checkUninitVar("void f() {\n"
" FILE * pFile;\n"
" ferror (pFile);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: pFile\n", errout.str());
checkUninitVar2("void f(FILE * pFile) {\n"
" ferror (pFile);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Test that the fflush function, defined in std.cfg is configured correctly.
void stdcfg_fflush() {
checkUninitVar("void f() {\n"
" FILE * pFile;\n"
" fflush (pFile);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: pFile\n", errout.str());
checkUninitVar2("void f(FILE * pFile) {\n"
" fflush (pFile);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Test that the fgetc function, defined in std.cfg is configured correctly.
void stdcfg_fgetc() {
checkUninitVar("void f() {\n"
" FILE * pFile;\n"
" fgetc (pFile);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: pFile\n", errout.str());
checkUninitVar2("void f(FILE * pFile) {\n"
" fgetc (pFile);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Test that the fgetpos function, defined in std.cfg is configured correctly.
void stdcfg_fgetpos() {
checkUninitVar("void f() {\n"
" FILE * f;\n"
" fpos_t * p;\n"
" fgetpos (f, p);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: f\n"
"[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar2("void f(FILE * f) {\n"
" fpos_t p;"
" fgetpos (f, &p);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f(FILE * f, fpos_t *p) {\n"
" fgetpos (f, p);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Test that the fsetpos function, defined in std.cfg is configured correctly.
void stdcfg_fsetpos() {
checkUninitVar("void f() {\n"
" FILE * f;\n"
" fpos_t * p;\n"
" fsetpos (f, p);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: f\n"
"[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar("void f(FILE * f) {\n"
" fpos_t *p;"
" fsetpos (f, p);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar("void f(FILE * f, fpos_t *p) {\n"
" fsetpos (f, p);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Test that the fgets function, defined in std.cfg is configured correctly.
void stdcfg_fgets() {
checkUninitVar("void f(FILE *f) {\n"
" char *s;\n"
" int n;\n"
" fgets (s, n, f);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: n\n"
"[test.cpp:4]: (error) Uninitialized variable: s\n", errout.str());
checkUninitVar2("void f(char * s, int n) {\n"
" FILE *f;\n"
" fgets (s, n, f);\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: f\n","", errout.str());
checkUninitVar2("void f(char * s, int n, FILE *f) {\n"
" fgets (s, n, f);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Test that the fputc function, defined in std.cfg is configured correctly.
void stdcfg_fputc() {
checkUninitVar("void f() {\n"
" int c;\n"
" FILE *f;"
" fputc (c, f);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: c\n"
"[test.cpp:3]: (error) Uninitialized variable: f\n", errout.str());
checkUninitVar2("void f(int c, FILE *f) {\n"
" fputc (c, f);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Test that the fputs function, defined in std.cfg is configured correctly.
void stdcfg_fputs() {
checkUninitVar("void f() {\n"
" char *c;\n"
" FILE *f;"
" fputs (c, f);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: c\n"
"[test.cpp:3]: (error) Uninitialized variable: f\n", errout.str());
checkUninitVar2("void f(char *c, FILE *f) {\n"
" fputs (c, f);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Test that the ftell function, defined in std.cfg is configured correctly.
void stdcfg_ftell() {
checkUninitVar("void f() {\n"
" FILE *f;"
" ftell (f);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Uninitialized variable: f\n", errout.str());
checkUninitVar2("void f( FILE *f) {\n"
" ftell (f);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Test that the puts function, defined in std.cfg is configured correctly.
void stdcfg_puts() {
checkUninitVar("void f() {\n"
" char *c;"
" puts (c);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Uninitialized variable: c\n", errout.str());
checkUninitVar2("void f( char *c) {\n"
" puts (c);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Test that the puts function, defined in std.cfg is configured correctly.
void stdcfg_putchar() {
checkUninitVar2("void f() {\n"
" char *c;"
" putchar (*c);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Uninitialized variable: c\n", errout.str());
checkUninitVar2("void f( char *c) {\n"
" putchar (*c);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Test that the wcstombs function, defined in std.cfg is configured correctly.
void stdcfg_wcstombs() {
// #6116 False positive uninitvar - first argument to wcstombs()
checkUninitVar2("void f( wchar_t *wstr) {\n"
" char buf[10];\n"
" wcstombs (buf, wstr, 3);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void f( char *str) {\n"
" wchar_t wbuf[10];\n"
" mbstowcs (wbuf, str, 3);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// Test that the tmpnam function, defined in std.cfg is configured correctly.
void stdcfg_tmpnam() {
checkUninitVar2("void foo() {\n"
" char buf[10];\n"
" tmpnam(buf);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void foo() {\n"
" char *ptr;\n"
" tmpnam(ptr);\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: ptr\n", "", errout.str());
}
void checkDeadPointer(const char code[]) {
// Clear the error buffer..
errout.str("");
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.simplifyTokenList2();
// Check code..
CheckUninitVar check(&tokenizer, &settings, this);
check.deadPointer();
}
void deadPointer() {
checkDeadPointer("void f() {\n"
" int *p = p1;\n"
" if (cond) {\n"
" int x;\n"
" p = &x;\n"
" }\n"
" *p = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Dead pointer usage. Pointer 'p' is dead if it has been assigned '&x' at line 5.\n", errout.str());
// FP: don't warn in subfunction
checkDeadPointer("void f(struct KEY *key) {\n"
" key->x = 0;\n"
"}\n"
"\n"
"int main() {\n"
" struct KEY *tmp = 0;\n"
" struct KEY k;\n"
"\n"
" if (condition) {\n"
" tmp = &k;\n"
" } else {\n"
" }\n"
" f(tmp);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void uninitvar_posix_write() { // #6325
// Load posix library file
LOAD_LIB_2(settings.library, "posix.cfg");
// check the first parameter of write
checkUninitVar("void uninitvar(char *buf)\n"
"{\n"
" int fd;\n"
" write(fd, buf, sizeof(buf));\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: fd\n", errout.str());
checkUninitVar2("void no_uninitvar(int fd, char *buf)\n"
"{\n"
" write(fd, buf, 8);\n"
"}");
ASSERT_EQUALS("", errout.str());
// check the second parameter of the posix function write
checkUninitVar("void uninitvar() {\n"
" char *buf;\n"
" write(STDOUT_FILENO, buf, sizeof(buf));\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: buf\n", errout.str());
checkUninitVar("void uninitvar() {\n"
" char buf[2];\n"
" write(STDOUT_FILENO, buf, 2);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: buf\n", errout.str());
// avoid false positives
checkUninitVar2("void no_uninitvar(char *buf) {\n"
" write(STDOUT_FILENO, buf, 8);\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar2("void no_uninitvar() {\n"
" char buf[1] = {'c'};\n"
" write(STDOUT_FILENO, &buf, 1);\n"
"}");
ASSERT_EQUALS("", errout.str());
// check the third parameter of the posix function write
checkUninitVar2("void uninitvar(char *buf) {\n"
" int nbytes;\n"
" write(STDOUT_FILENO, buf, nbytes);\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: nbytes\n", "", errout.str());
checkUninitVar2("void no_uninitvar(char *buf, int nbytes)\n"
"{\n"
" write(STDOUT_FILENO, buf, nbytes);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestUninitVar)
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