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testuninitvar.cpp
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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2024 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 "check.h"
#include "checkuninitvar.h"
#include "ctu.h"
#include "fixture.h"
#include "helpers.h"
#include "settings.h"
#include <list>
#include <string>
class TestUninitVar : public TestFixture {
public:
TestUninitVar() : TestFixture("TestUninitVar") {}
private:
const Settings settings = settingsBuilder().library("std.cfg").build();
void run() override {
TEST_CASE(uninitvar1);
TEST_CASE(uninitvar_warn_once); // only write 1 warning at a time
TEST_CASE(uninitvar_decl); // handling various types in C and C++ files
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_assign); // = {..}
TEST_CASE(uninitvar_strncpy); // strncpy doesn't always null-terminate
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
TEST_CASE(uninitvar_ignore); // ignore cast, *&x, ..
TEST_CASE(uninitvar2);
TEST_CASE(uninitvar3); // #3844
TEST_CASE(uninitvar4); // #3869 (reference)
TEST_CASE(uninitvar5); // #3861
TEST_CASE(uninitvar2_func); // function calls
TEST_CASE(uninitvar2_value); // value flow
TEST_CASE(valueFlowUninit2_value);
TEST_CASE(valueFlowUninit_uninitvar2);
TEST_CASE(valueFlowUninit_functioncall);
TEST_CASE(uninitStructMember); // struct members
TEST_CASE(uninitvar2_while);
TEST_CASE(uninitvar2_4494); // #4494
TEST_CASE(uninitvar2_malloc); // malloc returns uninitialized data
TEST_CASE(uninitvar8); // ticket #6230
TEST_CASE(uninitvar9); // ticket #6424
TEST_CASE(uninitvar10); // ticket #9467
TEST_CASE(uninitvar11); // ticket #9123
TEST_CASE(uninitvar12); // #10218 - stream read
TEST_CASE(uninitvar13); // #9772
TEST_CASE(uninitvar14);
TEST_CASE(uninitvar_unconditionalTry);
TEST_CASE(uninitvar_funcptr); // #6404
TEST_CASE(uninitvar_operator); // #6680
TEST_CASE(uninitvar_ternaryexpression); // #4683
TEST_CASE(uninitvar_pointertoarray);
TEST_CASE(uninitvar_cpp11ArrayInit); // #7010
TEST_CASE(uninitvar_rangeBasedFor); // #7078
TEST_CASE(uninitvar_static); // #8734
TEST_CASE(uninitvar_configuration);
TEST_CASE(checkExpr);
TEST_CASE(trac_4871);
TEST_CASE(syntax_error); // Ticket #5073
TEST_CASE(trac_5970);
TEST_CASE(valueFlowUninitTest);
TEST_CASE(valueFlowUninitBreak);
TEST_CASE(valueFlowUninitStructMembers);
TEST_CASE(uninitvar_ipa);
TEST_CASE(uninitvar_memberfunction);
TEST_CASE(uninitvar_nonmember); // crash in ycmd test
TEST_CASE(uninitvarDesignatedInitializers);
TEST_CASE(isVariableUsageDeref); // *p
TEST_CASE(isVariableUsageDerefValueflow); // *p
TEST_CASE(uninitvar_memberaccess); // (&(a))->b <=> a.b
// whole program analysis
TEST_CASE(ctuTest);
}
#define checkUninitVar(...) checkUninitVar_(__FILE__, __LINE__, __VA_ARGS__)
void checkUninitVar_(const char* file, int line, const char code[], bool cpp = true, bool debugwarnings = false, const Settings *s = nullptr) {
const Settings settings1 = settingsBuilder(s ? *s : settings).debugwarnings(debugwarnings).build();
// Tokenize..
SimpleTokenizer tokenizer(settings1, *this);
ASSERT_LOC(tokenizer.tokenize(code, cpp), file, line);
// Check for redundant code..
CheckUninitVar checkuninitvar(&tokenizer, &settings1, this);
checkuninitvar.check();
}
void uninitvar1() {
// extracttests.start: int b; int c;
// 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());
// Ticket #6455 - some compilers allow const variables to be uninitialized
// extracttests.disable
checkUninitVar("void foo() {\n"
" const int a;\n"
" b = c - a;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout_str());
// extracttests.enable
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..
// extracttests.start: struct Foo { void abcd(); };
checkUninitVar("static void foo()\n"
"{\n"
" Foo *p;\n"
" p->abcd();\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: p\n", errout_str());
// extracttests.start: template<class T> struct Foo { void abcd(); };
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());
// extracttests.start: struct Foo { void* a; };
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());
// extracttests.start: void bar(int);
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 void 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"
"}", true, false);
ASSERT_EQUALS("", errout_str());
checkUninitVar("static void foo() {\n"
" int x, y;\n"
" x = ((y) = 10);\n"
"}");
ASSERT_EQUALS("", errout_str());
// Ticket #3597
checkUninitVar("void f() {\n"
" int a;\n"
" int b = 1;\n"
" (b += a) = 1;\n"
"}");
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"
"}", true, /*debugwarnings=*/ false);
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
// extracttests.disable
{
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",
false);
ASSERT_EQUALS("[test.c:4]: (error) Uninitialized variable: ret\n", errout_str());
}
// extracttests.enable
// #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"
"}",
false, false);
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"
"}", true, false);
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"
"}", true, false);
ASSERT_EQUALS("", errout_str());
// Handling >> and <<
{
checkUninitVar("int a() {\n"
" int ret;\n"
" std::cin >> ret;\n"
" ret++;\n"
"}");
ASSERT_EQUALS("", errout_str());
checkUninitVar("void f(int b) {\n"
" int a;\n"
" std::cin >> b >> a;\n"
" return a;"
"}");
ASSERT_EQUALS("", errout_str());
checkUninitVar("void f() {\n"
" int ret[2];\n"
" std::cin >> ret[0];\n"
"}");
ASSERT_EQUALS("", errout_str());
checkUninitVar("void f(int i) {\n"
" int a;\n"
" i >> a;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout_str());
checkUninitVar("int a() {\n"
" int ret;\n"
" int a = value >> ret;\n"
"}\n",
false);
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" // <- TODO initialization?
" return *p;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: p\n", errout_str());
checkUninitVar("void a() {\n"
" int ret;\n"
" a = value << ret;\n"
"}\n",
false);
ASSERT_EQUALS("[test.c:3]: (error) Uninitialized variable: ret\n", errout_str());
// #4320 says this is a FP. << is overloaded.
checkUninitVar("int f() {\n"
" int a;\n"
" a << 1;\n" // <- TODO initialization?
" return a;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout_str());
// #4673
checkUninitVar("void f() {\n"
" int a;\n"
" std::cout << a;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout_str());
checkUninitVar("void f(std::ostringstream& os) {\n"
" int a;\n"
" os << a;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout_str());
checkUninitVar("void f() {\n"
" int a;\n"
" std::cout << 1 << a;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout_str());
checkUninitVar("void f(std::ostringstream& os) {\n"
" int a;\n"
" os << 1 << a;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout_str());
{
// #9422
checkUninitVar("void f() {\n"
" char *p = new char[10];\n"
" std::cout << (void *)p << 1;\n"
"}");
ASSERT_EQUALS("", errout_str());
checkUninitVar("void f() {\n"
" char p[10];\n"
" std::cout << (void *)p << 1;\n"
"}");
ASSERT_EQUALS("", errout_str());
checkUninitVar("void f() {\n"
" char *p = new char[10];\n"
" std::cout << p << 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Memory is allocated but not initialized: p\n", errout_str());
checkUninitVar("void f() {\n" // #9696
" int *p = new int[10];\n"
" std::cout << p << 1;\n"
"}");
ASSERT_EQUALS("", errout_str());
checkUninitVar("void f() {\n"
" int i[10];\n"
" std::cout << i;\n"
" char c[10];\n"
" std::cout << c;\n"
" wchar_t w[10];\n"
" std::cout << w;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: c\n"
"[test.cpp:7]: (error) Uninitialized variable: w\n",
errout_str());
checkUninitVar("void f() {\n"
" char p[10];\n"
" std::cout << p << 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: p\n", errout_str());
checkUninitVar("void f() {\n"
" char p[10];\n"
" std::cout << *p << 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: p\n", errout_str());
}
}
// #8494 : Overloaded & operator
checkUninitVar("void f() {\n"
" int x;\n"
" a & x;\n"
"}");
ASSERT_EQUALS("", errout_str());
checkUninitVar("void f(int a) {\n"
" int x;\n"
" a & x;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout_str());
checkUninitVar("void f() {\n"
" int a,b,c;\n"
" ar & a & b & c;\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 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"
" int a[10];\n"
" a[0] = 10 - a[1];\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a[1]\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"
"}", true, false);
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"
"}", true, false);
ASSERT_EQUALS("", errout_str());
checkUninitVar("int foo() {\n"
" int x,y=0;\n"
"again:\n"
" if (y) return x;\n"
" x = a;\n"
" y = 1;\n"
" goto again;\n"
"}", false, false);
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"
"}", true, false);
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());
// Ticket #5646
checkUninitVar("float foo() {\n"
" float source[2] = {3.1, 3.1};\n"
" float (*sink)[2] = &source;\n"
" return (*sink)[0];\n"
"}");
ASSERT_EQUALS("", errout_str());
// Ticket #9296
checkUninitVar("void f(void)\n"
"{\n"
" int x;\n"
" int z = (x) & ~__round_mask(1, 1);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: x\n", errout_str());
checkUninitVar("void f(void)\n"
"{\n"
" int x;\n"
" int z = (x) | ~__round_mask(1, 1);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: x\n", errout_str());
checkUninitVar("int __round_mask(int, int);\n"
"void f(void)\n"
"{\n"
" int x;\n"
" int* z = &x;\n"
"}");
ASSERT_EQUALS("", errout_str());
}
void uninitvar_warn_once() {
// extracttests.start: int a; int b;
checkUninitVar("void f() {\n"
" int x;\n"
" a = x;\n"
" b = x;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout_str());
}
// Handling of unknown types. Assume they are POD in C.
void uninitvar_decl() {
const char code[] = "void f() {\n"
" dfs a;\n"
" return a;\n"
"}";
// Assume dfs is a non POD type if file is C++
checkUninitVar(code, true);
ASSERT_EQUALS("", errout_str());
// Assume dfs is a POD type if file is C
checkUninitVar(code, false);
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"
"}";
checkUninitVar(code2, true);
ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized struct member: ab.a\n"
"[test.cpp:4]: (error) Uninitialized struct member: ab.b\n", errout_str());
checkUninitVar(code2, false);
ASSERT_EQUALS("[test.c:4]: (error) Uninitialized variable: ab\n", errout_str());
// Ticket #3890 - False positive for std::map
checkUninitVar("void f() {\n"
" std::map<int,bool> x;\n"
" return x;\n"
"}");
ASSERT_EQUALS("", errout_str());
// Ticket #3906 - False positive for std::vector pointer
checkUninitVar("void f() {\n"
" std::vector<int> *x = NULL;\n"
" return x;\n"
"}", true, false);
ASSERT_EQUALS("", errout_str());
{
// Ticket #6701 - Variable name is a POD type according to cfg
constexpr char xmldata[] = "<?xml version=\"1.0\"?>\n"
"<def format=\"1\">"
" <podtype name=\"_tm\"/>"
"</def>";
const Settings s = settingsBuilder(settings).libraryxml(xmldata, sizeof(xmldata)).build();
checkUninitVar("void f() {\n"
" Fred _tm;\n"
" _tm.dostuff();\n"
"}", true, false, &s);
ASSERT_EQUALS("", errout_str());
}
// Ticket #7822 - Array type
checkUninitVar("A *f() {\n"
" A a,b;\n"
" b[0] = 0;"
" return a;\n"
"}", false, false);
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"
"}");
ASSERT_EQUALS("", errout_str());
}
void uninitvar_bitop() {
// extracttests.start: int a; int c;
checkUninitVar("void foo() {\n"
" int b;\n"
" c = a | b;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: b\n", errout_str());
checkUninitVar("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() {
// extracttests.start: struct Foo { void abcd(); };
checkUninitVar("static void foo(int x)\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());
checkUninitVar("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());
checkUninitVar("int foo() {\n"
" int i;\n"
" if (1)\n"
" i = 11;\n"
" return i;\n"
"}");
ASSERT_EQUALS("", errout_str());
checkUninitVar("int bar(int x) {\n"
" int n;\n"
" if ( x == 23)\n"
" n = 1;\n"
" else if ( x == 11 )\n"
" n = 2;\n"
" return n;\n"
"}");
TODO_ASSERT_EQUALS("error", "", errout_str());
checkUninitVar("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());
checkUninitVar("int foo(int x)\n" // #5503
"{\n"
" int i;\n"
" if (x < 2)\n"
" i = 22;\n"
" else if (x >= 2)\n" // condition is always true
" i = 33;\n"
" return i;\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"
"}");
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"
"}", true, false);
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"
"}");
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"
"}");