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testuninitvar.cpp
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testuninitvar.cpp
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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2012 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:
void run() {
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 0-terminate
TEST_CASE(uninitvar_memset); // not 0-terminated
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
}
void checkUninitVar(const char code[], const char filename[] = "test.cpp") {
// Clear the error buffer..
errout.str("");
Settings settings;
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, filename);
tokenizer.simplifyTokenList();
// 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"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("void foo() {\n"
" int a;\n"
" b = a - c;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("void foo() {\n"
" int *p;\n"
" realloc(p,10);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar("void foo() {\n"
" int *p = NULL;\n"
" realloc(p,10);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// dereferencing uninitialized pointer..
checkUninitVar("static void foo()\n"
"{\n"
" Foo *p;\n"
" p->abcd();\n"
"}\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"
"}\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"
"}\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"
"}\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"
"}\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"
"}\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"
"}\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"
"}\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"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" int *x;\n"
" int *&y = x;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" int x = xyz::x;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int a;\n"
" a = 5 + a;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int a;\n"
" a++;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" extern int a;\n"
" a++;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int a;\n"
" bar(4 * a);\n"
"}\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"
"}\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"
"}\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"
"}\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"
"}\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"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
// Ticket #3597
checkUninitVar("int f() {\n"
" int a;\n"
" int b = 1;\n"
" (b += a) = 1;\n"
"}\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"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("static void foo()\n"
"{\n"
" Foo p;\n"
" int x = p.abcd();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// Unknown types
{
checkUninitVar("void a()\n"
"{\n"
" A ret;\n"
" return ret;\n"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void a()\n"
"{\n"
" int x;\n"
" int *y = &x;\n"
" *y = 0;\n"
" x++;\n"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
// Handling >> and <<
{
checkUninitVar("int a() {\n"
" int ret;\n"
" std::cin >> ret;\n"
" ret++;\n"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int a(FArchive &arc) {\n" // #3060 (initialization through operator<<)
" int *p;\n"
" arc << p;\n"
" return *p;\n"
"}\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());
}
checkUninitVar("void a() {\n" // asm
" int x;\n"
" asm();\n"
" x++;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void a()\n"
"{\n"
" int x[10];\n"
" struct xyz xyz1 = { .x = x };\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void a()\n"
"{\n"
" struct S *s;\n"
" s->x = 0;\n"
"}\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"
"}\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"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" char *buf = malloc(100);\n"
" struct ABC *abc = buf;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("class Fred {\n"
"public:\n"
" FILE *f;\n"
" ~Fred();\n"
"}\n"
"Fred::~Fred()\n"
"{\n"
" fclose(f);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int c;\n"
" ab(sizeof(xyz), &c);\n"
" if (c);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int c;\n"
" a = (f2(&c));\n"
" c++;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f(int a)\n"
"{\n"
" if (a) {\n"
" char *p;\n"
" *p = 0;\n"
" }\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"
"}\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"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Data is allocated but not initialized: s\n", errout.str());
checkUninitVar("void f()\n"
"{\n"
" int a[10];\n"
" a[0] = 10 - a[1];\n"
"}\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"
"}\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"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int foo()\n"
"{\n"
" int i;\n"
" goto exit;\n"
" i++;\n"
"exit:\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// Ticket #3480 - Don't crash garbage code
checkUninitVar("int f()\n"
"{\n"
" return if\n"
"}\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"
"}\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());
}
void uninitvar3() { // #3844
// avoid false positive
checkUninitVar("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"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void uninitvar_bitop() {
checkUninitVar("void foo() {\n"
" int b;\n"
" c = a | b;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: b\n", errout.str());
checkUninitVar("void foo() {\n"
" int b;\n"
" c = b | a;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: b\n", errout.str());
}
// if..
void uninitvar_if() {
checkUninitVar("static void foo()\n"
"{\n"
" Foo *p;\n"
" if (x)\n"
" p = new Foo;\n"
" p->abcd();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: p\n", errout.str());
checkUninitVar("static void foo(int x)\n"
"{\n"
" int a;\n"
" if (x==1);\n"
" if (x==2);\n"
" x = a;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("int foo()\n"
"{\n"
" int i;\n"
" if (x)\n"
" i = 22;\n"
" else\n"
" i = 33;\n"
" return i;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("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"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("static void foo(int x)\n"
"{\n"
" Foo *p;\n"
" if (x)\n"
" p = new Foo;\n"
" if (x)\n"
" p->abcd();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("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"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" C *c;\n"
" if (fun(&c));\n"
" c->Release();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f() {\n"
" char a[10];\n"
" if (a[0] = x){}\n"
"}");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int foo(int x)\n"
"{\n"
" int i;\n"
" if (one())\n"
" i = 1;\n"
" else\n"
" return 3;\n"
" return i;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// Ticket #2207 - False positive
checkUninitVar("void foo(int x) {\n"
" int a;\n"
" if (x)\n"
" a = 1;\n"
" if (!x)\n"
" return;\n"
" b = (c - a);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("int foo()\n"
"{\n"
" int ret;\n"
" if (one())\n"
" ret = 1;\n"
" else\n"
" throw 3;\n"
" return ret;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("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"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("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"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("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"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("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"
"}\n");
ASSERT_EQUALS("", errout.str());
// ? :
checkUninitVar("static void foo(int v)\n"
"{\n"
" int x;\n"
" x = v <= 0 ? -1 : x;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: x\n", errout.str());
checkUninitVar("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"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo(int a, int b)\n"
"{\n"
" int x; x = (a<b) ? 1 : 0;\n"
" int y = y;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: y\n", errout.str());
// ; { .. }
checkUninitVar("int foo()\n"
"{\n"
" int retval;\n"
" if (condition) {\n"
" { }\n"
" retval = 1; }\n"
" else\n"
" retval = 2;\n"
" return retval;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void foo()\n"
"{\n"
" {\n"
" for (int i = 0; i < 10; ++i)\n"
" { }\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"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: c1\n"
"[test.cpp:4]: (error) Uninitialized variable: c2\n", errout.str());
checkUninitVar("void f(char *c1, char *c2)\n"
"{\n"
" if(strcoll(c1,c2))\n"
" {\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void f()\n"
"{\n"
" char *c1;\n"
" c1=strcpy(c1,\"test\");\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: c1\n","", errout.str());
checkUninitVar("void f(char *c1)\n"
"{\n"
" c1=strcpy(c1,\"test\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
// handling for/while loops..
void uninitvar_loops() {
// for..
checkUninitVar("void f()\n"
"{\n"
" for (int i = 0; i < 4; ++i) {\n"
" int a;\n"
" b(4*a);\n"
" }"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: a\n", errout.str());
checkUninitVar("void f() {\n"
" int k;\n"
" for (int i = 0; i < 4; ++i) {\n"
" k = k + 2;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: k\n", errout.str());
checkUninitVar("void f() {\n"
" gchar sel[10];\n"
" for (int i = 0; i < 4; ++i) {\n"
" int sz = sizeof(sel);\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("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"
"}\n");
ASSERT_EQUALS("", errout.str());
checkUninitVar("void x() {\n"
" do {\n"
" Token * tok;\n"
" for (tok = a; tok; tok = tok->next())\n"
" {\n"
" }\n"
" } while (tok2);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// while..
checkUninitVar("int f()\n"
"{\n"
" int i;\n"
" while (fgets())\n"
" i = 1;\n"
" return i;"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: i\n", errout.str());
checkUninitVar("void f(int i)\n"
"{\n"
" int a;\n"
" while (i < 10)\n"
" i++;\n"
" a++;"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: a\n", errout.str());
// Ticket #2226: C++0x loop
checkUninitVar("void f() {\n"
" container c;\n"
" for (iterator it : c) {\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// Ticket #2345: False positive in sub-condition in if inside a loop
checkUninitVar("void f(int x) {\n"
" const PoolItem* pItem;\n"
" while (x > 0) {\n"
" if (GetItem(&pItem) && (*pItem != rPool))\n"
" { }\n"
" x--;\n"
" }\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"
"}\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
checkUninitVar("void foo() {\n"
" while (true) {\n"
" int x;\n"
" if (y) x = 0;\n"
" else break;\n"
" return x;\n" // <- x is initialized
" }\n"
"}");