/* * Cppcheck - A tool for static C/C++ code analysis * Copyright (C) 2007-2021 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 . */ #include "checkuninitvar.h" #include "library.h" #include "settings.h" #include "testsuite.h" #include "tokenize.h" #include #include struct InternalError; class TestUninitVar : public TestFixture { public: TestUninitVar() : TestFixture("TestUninitVar") {} private: Settings settings; void run() OVERRIDE { LOAD_LIB_2(settings.library, "std.cfg"); 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(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(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(checkExpr); TEST_CASE(trac_4871); TEST_CASE(syntax_error); // Ticket #5073 TEST_CASE(trac_5970); TEST_CASE(valueFlowUninit); TEST_CASE(valueFlowUninitBreak); TEST_CASE(valueFlowUninitStructMembers); TEST_CASE(uninitvar_ipa); TEST_CASE(uninitvar_memberfunction); TEST_CASE(uninitvar_nonmember); // crash in ycmd test TEST_CASE(isVariableUsageDeref); // *p // whole program analysis TEST_CASE(ctu); } void checkUninitVar(const char code[], const char fname[] = "test.cpp", bool debugwarnings = false) { // Clear the error buffer.. errout.str(""); // Tokenize.. settings.debugwarnings = debugwarnings; Tokenizer tokenizer(&settings, this); std::istringstream istr(code); tokenizer.tokenize(istr, fname); // Check for redundant code.. CheckUninitVar checkuninitvar(&tokenizer, &settings, this); checkuninitvar.check(); settings.debugwarnings = false; settings.certainty.enable(Certainty::experimental); } 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 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: 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" "}", "test.cpp", 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" "}", "test.cpp", /*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", "test.c"); 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" "}", "test.c", 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" "}", "test.cpp", 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" "}", "test.cpp", 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", "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" // <- 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", "test.c"); 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" " 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" "}", "test.cpp", 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" "}", "test.cpp", 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" "}", "test.c", 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" "}", "test.cpp", 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, "test.cpp"); ASSERT_EQUALS("", errout.str()); // Assume dfs is a POD type if file is C checkUninitVar(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" "}"; checkUninitVar(code2, "test.cpp"); 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, "test.c"); 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 x;\n" " return x;\n" "}"); ASSERT_EQUALS("", errout.str()); // Ticket #3906 - False positive for std::vector pointer checkUninitVar("void f() {\n" " std::vector *x = NULL;\n" " return x;\n" "}", "test.cpp", false); ASSERT_EQUALS("", errout.str()); // Ticket #6701 - Variable name is a POD type according to cfg const char xmldata[] = "\n" "" " " ""; settings.library.loadxmldata(xmldata, sizeof(xmldata)); checkUninitVar("void f() {\n" " Fred _tm;\n" " _tm.dostuff();\n" "}"); ASSERT_EQUALS("", errout.str()); // Ticket #7822 - Array type checkUninitVar("A *f() {\n" " A a,b;\n" " b[0] = 0;" " return a;\n" "}", "test.c", 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" "}", "test.cpp", 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" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f()\n" "{\n" " C *c;\n" " if (fun(&c));\n" " c->Release();\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " C c;\n" " if (fun(&c.d));\n" " return c;\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" "}"); 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" "}"); 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" "}"); 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" "}"); ASSERT_EQUALS("[test.cpp:8]: (error) Uninitialized variable: ret\n", 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" "}"); 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" "}"); 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" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void foo(int *pix) {\n" " int dest_x;\n" " {\n" " if (pix)\n" " dest_x = 123;\n" " }\n" " if (pix)\n" " a = dest_x;\n" // <- not uninitialized "}"); ASSERT_EQUALS("", errout.str()); // ? : checkUninitVar("static void foo(int v) {\n" " int x;\n" " x = v <= 0 ? -1 : x;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (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" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void foo(int a, int b)\n" "{\n" " int x; x = (anext())\n" " {\n" " }\n" " } while (tok2);\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void foo(void) {\n" " int a = 0;\n" " int x;\n" "\n" " for (;;) {\n" " if (!a || 12 < x) {\n" // <- x is not uninitialized " a = 1;\n" " x = 2;\n" " }\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void foo(void) {\n" " int a = 0;\n" " int x;\n" "\n" " for (;;) {\n" " if (!a || 12 < x) {\n" // <- x is uninitialized " a = 1;\n" " }\n" " }\n" "}"); ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: x\n", errout.str()); checkUninitVar("void foo(int n) {\n" " int one[10];\n" " for (int rank = 0; rank < n; ++rank) {\n" " for (int i=0;i 0) {\n" " if (GetItem(&pItem) && (*pItem != rPool))\n" " { }\n" " x--;\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); // extracttests.start: struct PoolItem { bool operator!=(const PoolItem&) const; }; checkUninitVar("void f(int x, const PoolItem& rPool) {\n" " const PoolItem* pItem;\n" " while (x > 0) {\n" " if (*pItem != rPool)\n" " { }\n" " x--;\n" " }\n" "}"); 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" "}"); TODO_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" "}"); ASSERT_EQUALS("", errout.str()); // Assignment in for. Ticket #3287 checkUninitVar("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()); // #10273 - assignment in conditional code // extracttests.start: extern const int PORT_LEARN_DISABLE; checkUninitVar("void foo() {\n" " int learn;\n" " for (int index = 0; index < 10; index++) {\n" " if (!(learn & PORT_LEARN_DISABLE))\n" " learn = 123;\n" " }\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: learn\n", errout.str()); // extracttests.start: struct Entry { Entry *next; }; Entry *buckets[10]; checkUninitVar("void foo() {\n" " Entry *entry, *nextEntry;\n" " for(int i = 0; i < 10; i++) {\n" " for(entry = buckets[i]; entry != NULL; entry = nextEntry) {\n" // <- nextEntry is not uninitialized " nextEntry = entry->next;\n" " }\n" " }\n" "}\n"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void foo() {\n" " Entry *entry, *nextEntry;\n" " for(int i = 0; i < 10; i++) {\n" " for(entry = buckets[i]; entry != NULL; entry = nextEntry) {\n" " }\n" " }\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: nextEntry\n", errout.str()); checkUninitVar("void f(int x) {\n" " list *f = NULL;\n" " list *l;\n" "\n" " while (--x) {\n" " if (!f)\n" " f = c;\n" " else\n" " l->next = c;\n" // <- not uninitialized " l = c;\n" " }\n" "}\n"); ASSERT_EQUALS("", errout.str()); // #6952 - do-while-loop checkUninitVar("void f(void)\n" "{\n" " int* p;\n" " do\n" " {\n" " if (true) {;}\n" " else\n" " {\n" " return;\n" " }\n" " *p = 7;\n" // << " p = new int(9);\n" " } while (*p != 8);\n" "}"); ASSERT_EQUALS("[test.cpp:11]: (error) Uninitialized variable: p\n", errout.str()); // #6952 - while-loop checkUninitVar("void f(void)\n" "{\n" " int* p;\n" " while (*p != 8) {\n" // << " *p = 7;\n" " p = new int(9);\n" " }\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str()); // switch in loop checkUninitVar("int foo(int *p) {\n" " int x;\n" " while (true) {\n" " switch (*p) {\n" " case 1:\n" " return x;\n" " case 2:\n" " x = 123;\n" " break;\n" " };\n" " ++p\n" " }\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" "}"); TODO_ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: c\n", "", errout.str()); checkUninitVar("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()); checkUninitVar("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()); // #1855 - switch(foo(&x)) checkUninitVar("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" "}", "test.cpp", false); ASSERT_EQUALS("", errout.str()); } // arrays.. void uninitvar_arrays() { checkUninitVar("void f()\n" "{\n" " char a[10];\n" " a[a[0]] = 0;\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: a[0]\n", errout.str()); checkUninitVar("int f()\n" "{\n" " char a[10];\n" " *a = '\\0';\n" " int i = strlen(a);\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f()\n" "{\n" " char a, b[10];\n" " a = b[0] = 0;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f()\n" "{\n" " char a[10], b[10];\n" " a[0] = b[0] = 0;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f()\n" "{\n" " char a[10], *p;\n" " *(p = a) = 0;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " char a[10], *p;\n" " p = &(a[10]);\n" "}"); ASSERT_EQUALS("", errout.str()); // array usage in ?: (tests that the isVariableUsed() works) checkUninitVar("void f() {\n" " char a[10], *p;\n" " p = c?a:0;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f(int x) {\n" " char a[10], c;\n" " c = *(x?a:0);\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str()); checkUninitVar("void f() {\n" " char a[10], c;\n" " strcpy(dest, x?a:\"\");\n" "}"); TODO_ASSERT_EQUALS("error", "", errout.str()); checkUninitVar("void f(int x) {\n" " int a[2];\n" " y *= (x ? 1 : 2);\n" "}"); ASSERT_EQUALS("", errout.str()); // passing array to library functions checkUninitVar("void f()\n" "{\n" " char c[50] = \"\";\n" " strcat(c, \"test\");\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f(char *s2) {\n" " char s[20];\n" " strcpy(s2, s);\n" "};"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: s\n", errout.str()); checkUninitVar("void f() {\n" " char s[20];\n" " strcat(s, \"abc\");\n" "};"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: s\n", errout.str()); checkUninitVar("void f() {\n" " char s[20];\n" " strchr(s, ' ');\n" "};"); ASSERT_EQUALS("[test.cpp:3]: (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()); checkUninitVar("void foo()\n" "{\n" " int a[2];\n" " init(a - 1);\n" " int b = a[0];\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void foo()\n" "{\n" " Fred a[2];\n" " Fred b = a[0];\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void foo() {\n" " char buf[1024];\n" " char *b = (char *) (((uintptr_t) buf + 63) & ~(uintptr_t) 63);\n" "}\n"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void foo() {\n" " char buf[1024];\n" " char x = *(char *) (((uintptr_t) buf + 63) & ~(uintptr_t) 63);\n" "}\n"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: buf\n", errout.str()); // Passing array to function checkUninitVar("void f(int i);\n" "void foo()\n" "{\n" " int a[10];\n" " f(a[0]);\n" "}"); ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: a\n", errout.str()); // Ticket #2320 checkUninitVar("void foo() {\n" " char a[2];\n" " unsigned long b = (unsigned long)(a+2) & ~7;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" // Ticket #3050 " char a[2];\n" " printf(\"%s\", a);\n" "}"); TODO_ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", "", errout.str()); checkUninitVar("void f() {\n" // Ticket #5108 (fp) " const char *a;\n" " printf(\"%s\", a=\"abc\");\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" // Ticket #3497 " char header[1];\n" " *((unsigned char*)(header)) = 0xff;\n" " return header[0];\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" // Ticket #3497 " char header[1];\n" " *((unsigned char*)((unsigned char *)(header))) = 0xff;\n" " return header[0];\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("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" "}", "test.cpp", false); ASSERT_EQUALS("[test.cpp:4]: (error) Memory is allocated but not initialized: buffer\n", errout.str()); checkUninitVar("void f(){\n" " char *strMsg = \"This is a message\";\n" " char *buffer=static_cast(malloc(128*sizeof(char)));\n" " strcpy(strMsg,buffer);\n" " free(buffer);\n" "}", "test.cpp", false); ASSERT_EQUALS("[test.cpp:4]: (error) Memory is allocated but not initialized: buffer\n", errout.str()); // #3845 checkUninitVar("int foo() {\n" " int a[1] = {5};\n" " return a[0];\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("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()); checkUninitVar("int foo() {\n" " int a[2][2];\n" " return a[0][1];\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str()); checkUninitVar("int foo() {\n" " int a[10];\n" " dostuff(a[0]);\n" "}"); ASSERT_EQUALS("", errout.str()); // # 4740 checkUninitVar("void f() {\n" " int *a[2][19];\n" " int **b = a[0];\n" "}"); ASSERT_EQUALS("", errout.str()); // #6869 - FP when passing uninit array to function checkUninitVar("void bar(PSTR x);\n" "void foo() {\n" " char x[10];\n" " bar(x);\n" "}"); ASSERT_EQUALS("", errout.str()); // struct checkUninitVar("struct Fred { int x; int y; };\n" "" "void f() {\n" " struct Fred fred[10];\n" " fred[1].x = 0;\n" "}", "test.c"); ASSERT_EQUALS("", errout.str()); } void uninitvar_pointertoarray() { checkUninitVar("void draw_quad(float z) {\n" " int i;\n" " float (*vertices)[2][4];\n" " vertices[0][0][0] = z;\n" " vertices[0][0][1] = z;\n" " vertices[1][0][0] = z;\n" " vertices[1][0][1] = z;\n" " vertices[2][0][0] = z;\n" " vertices[2][0][1] = z;\n" " vertices[3][0][0] = z;\n" " vertices[3][0][1] = z;\n" " for (i = 0; i < 4; i++) {\n" " vertices[i][0][2] = z;\n" " vertices[i][0][3] = 1.0;\n" " vertices[i][1][0] = 2.0;\n" " vertices[i][1][1] = 3.0;\n" " vertices[i][1][2] = 4.0;\n" " vertices[i][1][3] = 5.0;\n" " }\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: vertices\n", errout.str()); } void uninitvar_cpp11ArrayInit() { // #7010 checkUninitVar("double foo(bool flag) {\n" " double adIHPoint_local[4][4]{};\n" " function(*adIHPoint_local);\n" "}"); ASSERT_EQUALS("", errout.str()); } // alloc.. void uninitvar_alloc() { checkUninitVar("void f() {\n" " char *s = (char *)malloc(100);\n" " strcat(s, \"abc\");\n" "};"); ASSERT_EQUALS("[test.cpp:3]: (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 = (char*)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" " char *p = (char*)malloc(64);\n" " if (p[0]) { }\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Memory is allocated but not initialized: p[0]\n", errout.str()); checkUninitVar("char f() {\n" " char *p = (char*)malloc(64);\n" " return p[0];\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (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("struct Fred { int i; Fred(int, float); };\n" "void f() {\n" " Fred *fred = new Fred(1, 2);\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 = (char*)malloc(100);\n" " if (!s)\n" " return;\n" " char c = *s;\n" "}"); TODO_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()); // #6451 - allocation in subscope checkUninitVar("struct StgStrm {\n" " StgIo& rIo;\n" " StgStrm(StgIo&);\n" " virtual sal_Int32 Write();\n" "};\n" "void Tmp2Strm() {\n" " StgStrm* pNewStrm;\n" " if (someflag)\n" " pNewStrm = new StgStrm(rIo);\n" " else\n" " pNewStrm = new StgStrm(rIo);\n" " pNewStrm->Write();\n" "}"); ASSERT_EQUALS("", errout.str()); // #6450 - calling a member function is allowed if memory was allocated by new checkUninitVar("struct EMFPFont {\n" " bool family;\n" " void Initialize();\n" "};\n" "void processObjectRecord() {\n" " EMFPFont *font = new EMFPFont();\n" " font->Initialize();\n" "}"); ASSERT_EQUALS("", errout.str()); // #7623 - new can also initialize the memory, don't warn in this case checkUninitVar("void foo(){\n" " int* p1 = new int(314);\n" " int* p2 = new int();\n" " int* arr = new int[5]();\n" " std::cout << *p1 << *p2 << arr[0];\n" "}"); ASSERT_EQUALS("", errout.str()); // new in C code does not allocate.. checkUninitVar("int main() {\n" " char * pBuf = new(10);\n" " a = *pBuf;\n" "}", "test.c"); 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" "}", "test.cpp", false); 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" "}", "test.cpp", false); 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" "}", "test.cpp", false); 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()); // #6717 checkUninitVar("void f() {\n" " struct thing { int value; };\n" " thing it;\n" " int& referenced_int = it.value;\n" " referenced_int = 123;\n" "}"); ASSERT_EQUALS("", errout.str()); } void uninitvar_return() { checkUninitVar("static int foo() {\n" " int ret;\n" " return ret;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: ret\n", errout.str()); checkUninitVar("static int foo() {\n" " int ret;\n" " return ret+5;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (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" " cin >> ret;\n" " return 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 #6341- False negative { checkUninitVar("wchar_t f() { int i; return btowc(i); }"); ASSERT_EQUALS("[test.cpp:1]: (error) Uninitialized variable: i\n", errout.str()); checkUninitVar("wchar_t f(int i) { return btowc(i); }"); ASSERT_EQUALS("", errout.str()); // Avoid a potential false positive (#6341) checkUninitVar( "void setvalue(int &x) {\n" " x = 0;\n" " return 123;\n" "}\n" "int f() {\n" " int x;\n" " return setvalue(x);\n" "}"); ASSERT_EQUALS("", errout.str()); } // Ticket #5412 - False negative { checkUninitVar("void f(bool b) {\n" " double f;\n" " if (b) { }\n" " else {\n" " f = 0.0;\n" " }\n" " printf (\"%f\",f);\n" "}"); ASSERT_EQUALS("[test.cpp:7]: (error) Uninitialized variable: f\n", errout.str()); // Check for potential FP checkUninitVar("void f(bool b) {\n" " double f;\n" " if (b) { f = 1.0 }\n" " else {\n" " f = 0.0;\n" " }\n" " printf (\"%f\",f);\n" "}"); ASSERT_EQUALS("", 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()); } } void uninitvar_assign() { // = { .. } // #1533 checkUninitVar("char a()\n" "{\n" " char key;\n" " struct A msg = { .buf = {&key} };\n" " init(&msg);\n" " key++;\n" "}"); ASSERT_EQUALS("", 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()); // #6873 checkUninitVar("int f() {\n" " char a[10];\n" " char *b[] = {a};\n" " foo(b);\n" " return atoi(a);\n" "}"); ASSERT_EQUALS("", errout.str()); // = { .. } checkUninitVar("int f() {\n" " int a;\n" " int *p[] = { &a };\n" " *p[0] = 0;\n" " return a;\n" "}"); ASSERT_EQUALS("", errout.str()); } // strncpy doesn't always null-terminate.. void uninitvar_strncpy() { // TODO: Add this checking // Can it be added without hardcoding? checkUninitVar("void f()\n" "{\n" " char a[100];\n" " strncpy(a, s, 20);\n" " strncat(a, s, 20);\n" "}"); TODO_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" "}"); TODO_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" "}", "test.cpp", false); 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" "}", "test.cpp", false); ASSERT_EQUALS("", 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("[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("[test.cpp:3]: (error) Uninitialized variable: p\n", errout.str()); } void uninitvar_typeof() { checkUninitVar("void f() {\n" " struct Fred *fred;\n" " typeof(fred->x);\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("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" "}"); TODO_ASSERT_EQUALS("", "[test.cpp:3]: (error) Uninitialized variable: s\n", errout.str()); checkUninitVar("void f() {\n" " int *n = ({ typeof(*n) z; (typeof(*n)*)z; })\n" "}", "test.cpp", false); ASSERT_EQUALS("", errout.str()); } void uninitvar_ignore() { checkUninitVar("void foo() {\n" " int i;\n" " dostuff((int&)i, 0);\n" // <- cast is not use "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("int foo() {\n" " int i;\n" " return (int&)i + 2;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: i\n", errout.str()); checkUninitVar("void foo() {\n" " int i;\n" " dostuff(*&i, 0);\n" // <- *& is not use "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("int foo() {\n" " int i;\n" " return *&i;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: i\n", errout.str()); } void uninitvar2() { // using uninit var checkUninitVar("void f() {\n" " int x;\n" " x++;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str()); // extracttests.start: char str[10]; checkUninitVar("void f() {\n" " int x;\n" " str[x] = 0;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str()); checkUninitVar("void f() {\n" // #7736 " int buf[12];\n" " printf (\"%d\", buf[0] );\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: buf\n", errout.str()); checkUninitVar("void f() {\n" " int x;\n" " int y = x & 3;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str()); checkUninitVar("void f() {\n" " int x;\n" " int y = 3 & x;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str()); checkUninitVar("void f() {\n" " int x;\n" " x = 3 + x;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str()); checkUninitVar("void f() {\n" " int x;\n" " x = x;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str()); // extracttests.start: struct ABC {int a;}; checkUninitVar("void f() {\n" " struct ABC *abc;\n" " abc->a = 0;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: abc\n", errout.str()); checkUninitVar("int f() {\n" " static int x;\n" " return ++x;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("int f() {\n" " extern int x;\n" " return ++x;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" // #3926 - weird cast. " int x;\n" " *(((char *)&x) + 0) = 0;\n" "}", "test.c", false); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" // #4737 - weird cast. " int x;\n" " do_something(&((char*)&x)[0], 1);\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " int x;\n" " char *p = (char*)&x + 1;\n" "}", "test.cpp", false); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " int i;\n" " i=f(), i!=2;\n" "}"); ASSERT_EQUALS("", errout.str()); // using uninit var in condition checkUninitVar("void f(void) {\n" " int x;\n" " if (x) { }\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str()); checkUninitVar("void f() {\n" " int x;\n" " if (1 == (3 & x)) { }\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str()); // ?: checkUninitVar("int f(int *ptr) {\n" " int a;\n" " int *p = ptr ? ptr : &a;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("int f(int a) {\n" " int x;\n" " if (a==3) { x=2; }\n" " y = (a==3) ? x : a;\n" "}"); ASSERT_EQUALS("", errout.str()); // = ({ .. }) checkUninitVar("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" "}"; checkUninitVar(code, "test.cpp"); ASSERT_EQUALS("", errout.str()); checkUninitVar(code, "test.c"); ASSERT_EQUALS("[test.c:3]: (error) Uninitialized variable: x\n", errout.str()); } checkUninitVar("void f() {\n" " int i, i2;\n" " strm >> i >> i2;\n" "}"); ASSERT_EQUALS("", errout.str()); // unconditional initialization checkUninitVar("int f() {\n" " int ret;\n" " if (a) { ret = 1; }\n" " else { {} ret = 2; }\n" " return ret;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("int f() {\n" " int ret;\n" " if (a) { ret = 1; }\n" " else { s=foo(1,{2,3},4); ret = 2; }\n" " return ret;\n" "}"); ASSERT_EQUALS("", errout.str()); // conditional initialization checkUninitVar("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()); checkUninitVar("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 checkUninitVar("void f() {\n" " int a;\n" " if (init(&a)) { }\n" " a++;\n" "}"); ASSERT_EQUALS("", errout.str()); // return, break, continue, goto checkUninitVar("void f() {\n" " int x;\n" " if (y == 1) { return; }\n" " else { x = 1; }\n" " return x;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("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()); checkUninitVar("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"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " int i;\n" " if (x) {\n" " i = 1;\n" " } else {\n" " goto out;\n" " }\n" " i++;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("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()); checkUninitVar("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 checkUninitVar("void f() {\n" " try {\n" " } catch (CException* e) {\n" " trace();\n" " e->Delete();\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" // #5347 " try {\n" " } catch (const char* e) {\n" " A a = e;\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); // exit checkUninitVar("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) checkUninitVar("void foo() {\n" " int i;\n" " ({ if (0); });\n" " for_each(i) { }\n" "}", "test.c", false); // if, if checkUninitVar("void f(int a) {\n" " int i;\n" " if (a) i = 0;\n" " if (a) i++;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("static void f() {\n" " int a=0, b;\n" " if (something) { a = dostuff(&b); }\n" " if (!a || b) { }\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("static void f(int x, int y) {\n" " int a;\n" " if (x == 0 && (a == 1)) { }\n" "}", "test.cpp", false); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str()); checkUninitVar("void f() {\n" " int a;\n" " if (x) { a = 0; }\n" " if (x) { if (y) { a++; } }\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " int a;\n" " if (x) { a = 0; }\n" " if (x) { if (y) { } else { a++; } }\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("int f(int a) {\n" // #6583 " int x;\n" " if (a < 2) exit(1);\n" " else if (a == 2) x = 0;\n" " else exit(2);\n" " return x;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("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()); checkUninitVar("void f(int x) {\n" // #3948 " int value;\n" " if (x !=-1)\n" " value = getvalue();\n" " if (x == -1 || value > 300) {}\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("enum t_err { ERR_NONE, ERR_BAD_ARGS };\n" // #9649 "struct box_t { int value; };\n" "int init_box(box_t *p, int v);\n" "\n" "void foo(int ret) {\n" " box_t box2;\n" " if (ret == ERR_NONE)\n" " ret = init_box(&box2, 20);\n" " if (ret == ERR_NONE)\n" " z = x + box2.value;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f(int x) {\n" " int value;\n" " if (x == 32)\n" " value = getvalue();\n" " if (x == 1)\n" " v = value;\n" "}"); ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: value\n", errout.str()); checkUninitVar("void f(int x) {\n" " int value;\n" " if (x == 32)\n" " value = getvalue();\n" " if (x == 32) {}\n" " else v = value;\n" "}"); ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: value\n", errout.str()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("void f(int a) {\n" " int x;\n" " if (a) x=123;\n" " if (!a) {\n" " if (!a) {}\n" " else if (x) {}\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); // asm checkUninitVar("void f() {\n" " int x;\n" " asm();\n" " x++;\n" "}"); ASSERT_EQUALS("", errout.str()); // sizeof / typeof / offsetof / etc checkUninitVar("void f() {\n" " int i;\n" " sizeof(i+1);\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " int i;\n" " if (100 == sizeof(i+1));\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " struct ABC *abc;\n" " int i = ARRAY_SIZE(abc.a);" "}"); // FP ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " int *abc;\n" " typeof(*abc);\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " struct ABC *abc;\n" " return do_something(typeof(*abc));\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " A *a;\n" " a = malloc(sizeof(*a));\n" "}"); ASSERT_EQUALS("", errout.str()); // & checkUninitVar("void f() {\n" // #4426 - address of uninitialized variable " int a,b;\n" " if (&a == &b);\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" // #4439 - cast address of uninitialized variable " int a;\n" " x((LPARAM)(RECT*)&a);\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("int main() {\n" " int done;\n" " dostuff(1, (AuPointer) &done);\n" // <- It is not conclusive if the "&" is a binary or unary operator. Bailout. "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" // #4778 - cast address of uninitialized variable " long a;\n" " &a;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" // #4717 - ({}) " int a = ({ long b = (long)(123); 2 + b; });\n" "}", "test.c"); ASSERT_EQUALS("", errout.str()); } // #3869 - reference variable void uninitvar4() { checkUninitVar("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 checkUninitVar("void f() {\n" " x c;\n" " c << 2345;\n" "}"); ASSERT_EQUALS("", errout.str()); // ensure there is no false negative checkUninitVar("void f() {\n" " char c;\n" " char a = c << 2;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: c\n", errout.str()); } 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" "}"; checkUninitVar(code, "test.cpp"); ASSERT_EQUALS("", errout.str()); } void uninitvar9() { // 6424 const char code[] = "namespace Ns { class C; }\n" "void f1() { char *p; *p = 0; }\n" "class Ns::C* p;\n" "void f2() { char *p; *p = 0; }"; checkUninitVar(code, "test.cpp"); ASSERT_EQUALS("[test.cpp:2]: (error) Uninitialized variable: p\n" "[test.cpp:4]: (error) Uninitialized variable: p\n", errout.str()); } void uninitvar10() { // 9467 const char code[] = "class Foo {\n" " template \n" " bool bar() {\n" " return true;\n" " }\n" "};\n" "template <>\n" "bool Foo::bar<9>() {\n" " return true;\n" "}\n" "int global() {\n" " int bar = 1;\n" " return bar;\n" "}"; checkUninitVar(code, "test.cpp"); ASSERT_EQUALS("", errout.str()); } void uninitvar11() { // 9123 const char code[] = "bool get(int &var);\n" "void foo () {\n" " int x;\n" " x = get(x) && x;\n" "}"; checkUninitVar(code, "test.cpp"); ASSERT_EQUALS("", errout.str()); } void uninitvar12() { // 10218 const char code[] = "void fp() {\n" " std::stringstream ss;\n" " for (int i; ss >> i;) {}\n" "}"; checkUninitVar(code); ASSERT_EQUALS("", errout.str()); } void uninitvar13() { // #9772 - FP const char code[] = "int func(void)\n" "{ int rez;\n" " struct sccb* ccb;\n" " \n" " do\n" " { if ((ccb = calloc(1, sizeof(*ccb))) == NULL)\n" " { rez = 1;\n" " break;\n" " }\n" " rez = 0;\n" " } while (0);\n" " \n" " if (rez != 0)\n" " free(ccb);\n" " \n" " return rez;\n" "}"; checkUninitVar(code); ASSERT_EQUALS("", errout.str()); } void uninitvar_unconditionalTry() { // Unconditional scopes and try{} scopes checkUninitVar("int f() {\n" " int i;\n" " {\n" " return i;\n" " }\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: i\n", errout.str()); checkUninitVar("int f() {\n" " int i;\n" " try {\n" " return i;\n" " } catch(...) {}\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: i\n", errout.str()); } void uninitvar_funcptr() { // extracttests.disable checkUninitVar("void getLibraryContainer() {\n" " Reference< XStorageBasedLibraryContainer >(*Factory)(const Reference< XComponentContext >&, const Reference< XStorageBasedDocument >&)\n" " = &DocumentDialogLibraryContainer::create;\n" " rxContainer.set((*Factory)(m_aContext, xDocument));\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void foo() {\n" " void* x;\n" " int (*f)(int, int) = x;\n" " dostuff((*f)(a,b));\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str()); checkUninitVar("void getLibraryContainer() {\n" " Reference< XStorageBasedLibraryContainer >(*Factory)(const Reference< XComponentContext >&, const Reference< XStorageBasedDocument >&);\n" " rxContainer.set((*Factory)(m_aContext, xDocument));\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: Factory\n", errout.str()); // extracttests.enable } void uninitvar_operator() { // Ticket #6463, #6680 checkUninitVar("struct Source { Source& operator>>(int& i) { i = 0; return *this; } };\n" "struct Sink { int v; };\n" "Source foo;\n" "void uninit() {\n" " Sink s;\n" " int n = 1 >> s.v;\n" // Not initialized "};\n" "void notUninit() {\n" " Sink s1;\n" " foo >> s1.v;\n" // Initialized by operator>> " Sink s2;\n" " int n;\n" " foo >> s2.v >> n;\n" // Initialized by operator>> "}"); ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized struct member: s.v\n", errout.str()); checkUninitVar("struct Fred { int a; };\n" "void foo() {\n" " Fred fred;\n" " std::cin >> fred.a;\n" "}"); ASSERT_EQUALS("", errout.str()); } // Handling of function calls void uninitvar2_func() { // #4716 checkUninitVar("void bar(const int a, const int * const b);\n" "int foo(void) {\n" " int a;\n" " int *b = 0;\n" " bar(a,b);\n" // << " return 0;\n" "}"); ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: a\n", errout.str()); // non-pointer variable checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("void a(char *c);\n" // address => no error "void b() {\n" " char c;\n" " a(&c);\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void a(pstr s);\n" // address => no error "void b() {\n" " char c;\n" " a(&c);\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void a(const char *c);\n" // const address => data is not changed "void b() {\n" " char c;\n" " a(&c);\n" // <- no warning " c++;\n" // <- uninitialized variable "}"); TODO_ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: c\n", "", errout.str()); // pointer variable checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("void a(char **c);\n" // address of pointer => no error "void b() {\n" " char *c;\n" " a(&c);\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("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()); checkUninitVar("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()); // array 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()); checkUninitVar("void f() {\n" " int x[10];\n" " int &x0(*x);\n" "}"); ASSERT_EQUALS("", errout.str()); // .... checkUninitVar("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()); checkUninitVar("void write_packet() {\n" " time_t now0;\n" " time(&now0);\n" "}", "test.c"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void write_packet() {\n" " time_t* now0;\n" " time(now0);\n" "}", "test.c"); ASSERT_EQUALS("[test.c:3]: (error) Uninitialized variable: now0\n", errout.str()); checkUninitVar("void write_packet() {\n" " char now0;\n" " strcmp(&now0, sth);\n" "}", "test.c"); ASSERT_EQUALS("[test.c:3]: (error) Uninitialized variable: now0\n", errout.str()); // #2775 - uninitialized struct pointer in subfunction // extracttests.start: struct Fred {int x;}; checkUninitVar("void a(struct Fred *fred) {\n" " fred->x = 0;\n" "}\n" "\n" "void b() {\n" " struct Fred *p;\n" " a(p);\n" "}"); 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()); // unknown macro checkUninitVar("void f() {\n" " struct listnode *item;\n" " list_for_each(item, &key_list) {}\n" "}"); ASSERT_EQUALS("", errout.str()); } void uninitvar2_value() { checkUninitVar("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" "}", "test.cpp", false); ASSERT_EQUALS("", errout.str()); checkUninitVar("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" "}", "test.cpp", false); ASSERT_EQUALS("", errout.str()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("void f(int x) {\n" " int i;\n" " if (x) i = 0;\n" " if (!x || i>0) {}\n" // <- no error "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("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()); // extracttests.start: int y; checkUninitVar("int f(int x) {\n" // FP with ?: " int a;\n" " if (x)\n" " a = y;\n" " return x ? 2*a : 0;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("int f(int x) {\n" " int a;\n" " if (x)\n" " a = y;\n" " return y ? 2*a : 3*a;\n" "}"); ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: a\n", errout.str()); checkUninitVar("void f() {\n" // Don't crash " int a;\n" " dostuff(\"ab\" cd \"ef\", x?a:z);\n" // <- No AST is created for ?: "}"); // Unknown => bail out.. checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("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 uninitStructMember() { // struct members checkUninitVar("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()); checkUninitVar("struct AB { int a; int b; };\n" "void f(void) {\n" " AB ab;\n" " int a = ab.a;\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized struct member: ab.a\n", errout.str()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("struct AB { int a; int b; };\n" // #4760 "void do_something(int a);\n" "void f(void) {\n" " struct AB ab;\n" " do_something(ab.a);\n" "}\n", "test.c"); ASSERT_EQUALS("[test.c:5]: (error) Uninitialized struct member: ab.a\n", errout.str()); checkUninitVar("struct AB { int a; int b; };\n" "void do_something(const struct AB &ab) { a = ab.a; }\n" "void f(void) {\n" " struct AB ab;\n" " ab.a = 0;\n" " do_something(ab);\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("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()); checkUninitVar("struct AB { int a; int b; };\n" "void f(void) {\n" " AB ab1;\n" " AB ab2 = { ab1.a, 0 };\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized struct member: ab1.a\n", errout.str()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("void f(void) {\n" " struct AB ab;\n" " int x;\n" " ab.a = (addr)&x;\n" " dostuff(&ab,0);\n" "}\n", "test.c"); ASSERT_EQUALS("", errout.str()); checkUninitVar("struct 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()); checkUninitVar("struct 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()); checkUninitVar("struct 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()); checkUninitVar("struct 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()); checkUninitVar("struct 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()); checkUninitVar("struct 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()); checkUninitVar("struct 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()); checkUninitVar("struct 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()); checkUninitVar("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()); checkUninitVar("struct Cstring { char *text; int size, alloc; };\n" "int maybe();\n" "void f() {\n" " Cstring res;\n" " if ( ! maybe() ) return;\n" // <- fp goes away if this is removed " ( ((res).text = (void*)0), ((res).size = (res).alloc = 0) );\n" // <- fp goes away if parentheses are removed "}"); ASSERT_EQUALS("", errout.str()); { const char argDirectionsTestXmlData[] = "\n" "\n" " \n" " \n" " \n" " \n" " \n" " \n" ""; ASSERT_EQUALS(true, settings.library.loadxmldata(argDirectionsTestXmlData, sizeof(argDirectionsTestXmlData) / sizeof(argDirectionsTestXmlData[0]))); checkUninitVar("struct AB { int a; };\n" "void f(void) {\n" " struct AB ab;\n" " uninitvar_funcArgInTest(&ab);\n" " x = ab;\n" "}\n", "test.c"); ASSERT_EQUALS("[test.c:5]: (error) Uninitialized struct member: ab.a\n", errout.str()); checkUninitVar("struct AB { int a; };\n" "void f(void) {\n" " struct AB ab;\n" " uninitvar_funcArgOutTest(&ab);\n" " x = ab;\n" "}\n", "test.c"); ASSERT_EQUALS("", errout.str()); } checkUninitVar("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()); { checkUninitVar("struct AB { char a[10]; };\n" "void f(void) {\n" " struct AB ab;\n" " strcpy(ab.a, STR);\n" "}\n", "test.c"); ASSERT_EQUALS("", errout.str()); checkUninitVar("struct AB { unsigned char a[10]; };\n" // #8999 - cast "void f(void) {\n" " struct AB ab;\n" " strcpy((char *)ab.a, STR);\n" "}\n", "test.c"); ASSERT_EQUALS("", errout.str()); checkUninitVar("struct AB { char a[10]; };\n" "void f(void) {\n" " struct AB ab;\n" " strcpy(x, ab.a);\n" "}\n", "test.c"); TODO_ASSERT_EQUALS("[test.c:4]: (error) Uninitialized variable: ab.a\n", "", errout.str()); checkUninitVar("struct AB { int a; };\n" "void f(void) {\n" " struct AB ab;\n" " dosomething(ab.a);\n" "}\n", "test.c"); ASSERT_EQUALS("", errout.str()); } checkUninitVar("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()); { // #6769 - calling method that might assign struct members checkUninitVar("struct AB { int a; int b; void set(); };\n" "void f(void) {\n" " struct AB ab;\n" " ab.set();\n" " x = ab;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("struct AB { int a; int get() const; };\n" "void f(void) {\n" " struct AB ab;\n" " ab.get();\n" " x = ab;\n" "}"); ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized struct member: ab.a\n", errout.str()); checkUninitVar("struct AB { int a; void dostuff() {} };\n" "void f(void) {\n" " struct AB ab;\n" " ab.dostuff();\n" " x = ab;\n" "}"); TODO_ASSERT_EQUALS("error", "", errout.str()); } checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("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" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("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" "}"); /* TODO ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized struct member: abc.a\n" "[test.cpp:5]: (error) Uninitialized struct member: abc.b\n" "[test.cpp:5]: (error) Uninitialized struct member: abc.c\n", errout.str()); */ checkUninitVar("struct ABC { int a; int b; int c; };\n" "void foo() {\n" " struct ABC abc;\n" " dostuff((uint32_t *)&abc.a);\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f(void) {\n" " struct tm t;\n" " t.tm_year = 123;\n" "}"); ASSERT_EQUALS("", errout.str()); // return checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("struct S { int a; int b; };\n" // #8299 "void f(void) {\n" " struct S s;\n" " s.a = 0;\n" " return s;\n" "}\n"); ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized struct member: s.b\n", errout.str()); checkUninitVar("struct S { int a; int b; };\n" // #9810 "void f(void) {\n" " struct S s;\n" " return s.a ? 1 : 2;\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized struct member: s.a\n", errout.str()); // checkIfForWhileHead checkUninitVar("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()); checkUninitVar("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", false); ASSERT_EQUALS("[test.c:9]: (error) Uninitialized struct member: fred.b\n", errout.str()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("void test2() {\n" " struct { char type; } s_d;\n" " if (foo(&s_d.type)){}\n" "}"); ASSERT_EQUALS("", errout.str()); // for checkUninitVar("struct AB { int a; };\n" "void f() {\n" " struct AB ab;\n" " while (x) { clear(ab); z = ab.a; }\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("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()); checkUninitVar("struct AB { int a; };\n" "void f() {\n" " struct AB ab;\n" " while (x) { init(&ab); z = ab.a; }\n" "}"); ASSERT_EQUALS("", errout.str()); // address of member checkUninitVar("struct AB { int a[10]; int b; };\n" "void f() {\n" " struct AB ab;\n" " int *p = ab.a;\n" "}"); ASSERT_EQUALS("", errout.str()); // Reference checkUninitVar("struct A { int x; };\n" "void foo() {\n" " struct A a;\n" " int& x = a.x;\n" " x = 0;\n" " return a.x;\n" "}"); ASSERT_EQUALS("", errout.str()); // non static data-member initialization checkUninitVar("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()); // STL class member checkUninitVar("struct A {\n" " std::map m;\n" " int i;\n" "};\n" "void foo() {\n" " A a;\n" " x = a.m;\n" "}"); ASSERT_EQUALS("", errout.str()); // Unknown type (C++) checkUninitVar("struct A {\n" " C m;\n" " int i;\n" "};\n" "void foo() {\n" " A a;\n" " x = a.m;\n" "}", "test.cpp"); ASSERT_EQUALS("", errout.str()); // Unknown type (C) checkUninitVar("struct A {\n" " C m;\n" " int i;\n" "};\n" "void foo() {\n" " A a;\n" " x = a.m;\n" "}", "test.c"); ASSERT_EQUALS("[test.c:7]: (error) Uninitialized struct member: a.m\n", errout.str()); // Type with constructor checkUninitVar("class C { C(); }\n" "struct A {\n" " C m;\n" " int i;\n" "};\n" "void foo() {\n" " A a;\n" " x = a.m;\n" "}"); ASSERT_EQUALS("", errout.str()); } void uninitvar2_while() { // extracttests.start: int a; // for, while checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("void f() {\n" " for (int x = x; x < 10; x++) {}\n" "}"); ASSERT_EQUALS("[test.cpp:2]: (error) Uninitialized variable: x\n", errout.str()); // extracttests.start: struct Element{Element*Next();}; checkUninitVar("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()); // extracttests.start: int a; checkUninitVar("void f() {\n" " int x;\n" " while (a) {\n" " init(&x);\n" " x++;\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " int x;\n" " while (a) {\n" " if (b) x++;\n" " else x = 0;\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " int x;\n" " for (int i = 0; i < 10; i += x) {\n" " x = y;\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("void f() {\n" " int i;\n" " do {} while (!getvalue(&i));\n" " i++;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("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" "}"); TODO_ASSERT_EQUALS("error", "", errout.str()); checkUninitVar("int f(void) {\n" " int x;\n" " while (a()) {\n" " if (b() && (x=1)) {\n" " return x;\n" " }\n" " }\n" " return 0;\n" "}"); ASSERT_EQUALS("", errout.str()); // extracttests.start: void do_something(int); checkUninitVar("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()); checkUninitVar("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 struct member: ab.a\n", errout.str()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("static void f(void) {\n" " struct ABC *abc;\n" " for (i = 0; i < 10; i++)\n" " x += sizeof(*abc);\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("void f(void) {\n" " int i;\n" " while (x) {\n" " for (i=0,y=i;;){}\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " char *p = (char *)malloc(256);\n" " while(*p && *p == '_')\n" " p++;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Memory is allocated but not initialized: *p\n", errout.str()); // #6646 - init in for loop checkUninitVar("void f() {\n" // No FP " for (int i;;i++)\n" " dostuff(&i);\n" "}"); ASSERT_EQUALS("", errout.str()); // extracttests.start: int a; checkUninitVar("void f() {\n" // No FN " for (int i;;i++)\n" " a=i;\n" "}"); ASSERT_EQUALS("[test.cpp:2]: (error) Uninitialized variable: i\n", errout.str()); } void uninitvar2_4494() { checkUninitVar("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()); checkUninitVar("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()); checkUninitVar("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() { checkUninitVar("int f() {\n" " int *p = (int*)malloc(40);\n" " return *p;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Memory is allocated but not initialized: p\n", errout.str()); checkUninitVar("void f() {\n" " int *p = (int*)malloc(40);\n" " int var = *p;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Memory is allocated but not initialized: p\n", errout.str()); checkUninitVar("struct AB { int a; int b; };\n" "int f() {\n" " struct AB *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()); checkUninitVar("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) {};\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " char *s = malloc(100);\n" " if (s != NULL) { }\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " char *p = malloc(100);\n" " p || assert_failed();\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " char *p = malloc(100);\n" " x = p;\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("int* f() {\n" " int *p = (int*)malloc(40);\n" " return p;\n" "}"); ASSERT_EQUALS("", errout.str()); // function parameter (treat it as initialized until malloc is used) checkUninitVar("int f(int *p) {\n" " if (*p == 1) {}\n" // no error " p = (int*)malloc(256);\n" " return *p;\n" // error "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Memory is allocated but not initialized: p\n", errout.str()); checkUninitVar("struct AB { int a; int b; };\n" "int f(struct AB *ab) {\n" " if (ab->a == 1) {}\n" // no error " ab = (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()); checkUninitVar("struct AB { int a; int b; };\n" "void do_something(struct AB *ab);\n" // unknown function "void f() {\n" " struct AB *ab = (AB*)malloc(sizeof(struct AB));\n" " do_something(ab);\n" "}"); ASSERT_EQUALS("", errout.str()); // analysis failed. varid 0. checkUninitVar("void *vlc_custom_create (vlc_object_t *parent, size_t length, const char *typename) {\n" " assert (length >= sizeof (vlc_object_t));\n" "}"); ASSERT_EQUALS("", errout.str()); } void uninitvar_ternaryexpression() { // #4683 checkUninitVar("struct B { int asd; };\n" "int f() {\n" " int a=0;\n" " struct B *b;\n" " if (x) {\n" " a = 1;\n" " b = p;\n" " }\n" " return a ? b->asd : 0;\n" "}"); ASSERT_EQUALS("", errout.str()); } void uninitvar_rangeBasedFor() { checkUninitVar("void function(Entry& entry) {\n" // #7078 " for (auto* expr : entry.exprs) {\n" " expr->operate();\n" " expr->operate();\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " int *item;\n" " for (item: itemList) {}\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " int buf[10];\n" " for (int &i: buf) { i = 0; }\n" "}"); ASSERT_EQUALS("", errout.str()); } void uninitvar_static() { // #8734 checkUninitVar("struct X { " " typedef struct { int p; } P_t; " " static int arr[]; " "}; " "int X::arr[] = {42}; " "void f() { " " std::vector result; " " X::P_t P; " " P.p = 0; " " result.push_back(P); " "}"); ASSERT_EQUALS("", errout.str()); } void checkExpr() { checkUninitVar("struct AB { int a; int b; };\n" "void f() {\n" " struct AB *ab = (struct AB*)calloc(1, sizeof(*ab));\n" "}"); ASSERT_EQUALS("", errout.str()); } void trac_4871() { // #4871 checkUninitVar("void pickup(int a) {\n" "bool using_planner_action;\n" "if (a) {\n" " using_planner_action = false;\n" "}\n" "else {\n" " try\n" " {}\n" " catch (std::exception &ex) {\n" " return;\n" " }\n" " using_planner_action = true;\n" "}\n" "if (using_planner_action) {}\n" "}"); ASSERT_EQUALS("", errout.str()); } void syntax_error() { // Ticket #5073 const char code[] = "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" "}"; ASSERT_THROW(checkUninitVar(code), InternalError); } void trac_5970() { // Ticket #5970 checkUninitVar("void DES_ede3_ofb64_encrypt() {\n" " DES_cblock d;\n" " char *dp;\n" " dp=(char *)d;\n" " init(dp);\n" "}", "test.c"); // FP Unknown type ASSERT_EQUALS("", errout.str()); } void valueFlowUninit(const char code[], const char fname[] = "test.cpp") { // Clear the error buffer.. errout.str(""); // Tokenize.. settings.debugwarnings = false; settings.certainty.disable(Certainty::experimental); Tokenizer tokenizer(&settings, this); std::istringstream istr(code); tokenizer.tokenize(istr, fname); // Check for redundant code.. CheckUninitVar checkuninitvar(&tokenizer, &settings, this); checkuninitvar.valueFlowUninit(); } void valueFlowUninit() { // Ticket #2207 - False negative valueFlowUninit("void foo() {\n" " int a;\n" " b = c - a;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str()); valueFlowUninit("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 valueFlowUninit("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 valueFlowUninit("void foo() {\n" " int *p;\n" " realloc(p,10);\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: p\n", errout.str()); valueFlowUninit("void foo() {\n" // #5240 " char *p = malloc(100);\n" " char *tmp = realloc(p,1000);\n" " if (!tmp) free(p);\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void foo() {\n" " int *p = NULL;\n" " realloc(p,10);\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void f() {\n" " int x;\n" " switch (x) {}\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str()); valueFlowUninit("int f() {\n" " int x;\n" " init(x);\n" " return x;\n" // TODO: inconclusive ? "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void f() {\n" // #8172 " char **x;\n" " if (2 < sizeof(*x)) {}\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void foo() {\n" // #5259 - False negative " int a;\n" " int x[] = {a,2};\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str()); valueFlowUninit("void foo()\n" "{\n" " int x;\n" " int *y = &x;\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void foo()\n" "{\n" " int *x;\n" " int *&y = x;\n" " y = nullptr;\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void foo()\n" "{\n" " int x = xyz::x;\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void f()\n" "{\n" " extern int a;\n" " a++;\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("static void foo()\n" "{\n" " int x, y;\n" " x = (y = 10);\n" " int z = y * 2;\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("static void foo() {\n" " int x, y;\n" " x = ((y) = 10);\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("static void foo()\n" "{\n" " Foo p;\n" " p.abcd();\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("static void foo()\n" "{\n" " Foo p;\n" " int x = p.abcd();\n" "}"); ASSERT_EQUALS("", errout.str()); // struct valueFlowUninit("struct AB { int a; int b; };\n" "void f(void) {\n" " AB ab;\n" " AB *p = &ab;\n" " p->a = 1;\n" "}\n"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("struct S {\n" " S& rIo;\n" " S(S&);\n" " void Write();\n" "};\n" "void foo(bool b, struct S &io) {\n" " S* p;\n" " if (b)\n" " p = new S(io);\n" " p->Write();\n" "}"); ASSERT_EQUALS("[test.cpp:8] -> [test.cpp:10]: (error) Uninitialized variable: p.rIo\n", errout.str()); // Unknown types { valueFlowUninit("void a()\n" "{\n" " A ret;\n" " return ret;\n" "}"); ASSERT_EQUALS("", errout.str()); // #3916 - avoid false positive valueFlowUninit("void f(float x) {\n" " union lf { long l; float f; } u_lf;\n" " float hx = (u_lf.f = (x), u_lf.l);\n" "}"); ASSERT_EQUALS("", errout.str()); } valueFlowUninit("void a()\n" "{\n" " int x[10];\n" " int *y = x;\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void a()\n" "{\n" " int x;\n" " int *y = &x;\n" " *y = 0;\n" " x++;\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("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()); // Handling >> and << { valueFlowUninit("int a() {\n" " int ret;\n" " std::cin >> ret;\n" " ret++;\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void f(int b) {\n" " int a;\n" " std::cin >> b >> a;\n" " return a;" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void foo() {\n" // #3707 " Node node;\n" " int x;\n" " node[\"abcd\"] >> x;\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("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()); // #4320 valueFlowUninit("void f() {\n" " int a;\n" " a << 1;\n" " return a;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str()); // #9750 valueFlowUninit("struct S {\n" " int one;\n" " int two;\n" "};\n" "\n" "void test(std::istringstream& in) {\n" " S p;\n" " in >> p.one >> p.two;\n" "}"); ASSERT_EQUALS("", errout.str()); } valueFlowUninit("struct S { int x; };\n" // #9417 "void f() {\n" " S s;\n" " return s(1);\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void a() {\n" // asm " int x;\n" " asm();\n" " x++;\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void a()\n" "{\n" " int x[10];\n" " struct xyz xyz1 = { .x = x };\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void foo()\n" "{\n" " char *buf = malloc(100);\n" " struct ABC *abc = buf;\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("class Fred {\n" "public:\n" " FILE *f;\n" " ~Fred();\n" "}\n" "Fred::~Fred()\n" "{\n" " fclose(f);\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void f()\n" "{\n" " int c;\n" " ab(sizeof(xyz), &c);\n" " if (c);\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void f()\n" "{\n" " int c;\n" " a = (f2(&c));\n" " c++;\n" "}"); ASSERT_EQUALS("", errout.str()); // goto/setjmp/longjmp.. valueFlowUninit("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()); valueFlowUninit("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()); // range for.. valueFlowUninit("void f() {\n" " X *item;\n" " for (item: itemList) {}\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("X f() {\n" " if (!itemList.empty()) {\n" " X* item;\n" " for(item: itemList) {}\n" " return *item;\n" " }\n" " return X{};\n" "}\n"); ASSERT_EQUALS("", errout.str()); // macro_for.. valueFlowUninit("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()); valueFlowUninit("void foo(struct qb_list_head *list) {\n" " struct qb_list_head *iter;\n" " qb_list_for_each(iter, list) {}\n" "}\n"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void json_parse_nat_type_flags(json_t *root) {\n" " int index;\n" " json_array_foreach(root, index, value) {}\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("int foo()\n" "{\n" " int i;\n" " goto exit;\n" " i++;\n" "exit:\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("int foo() {\n" " int x,y=0;\n" "again:\n" " if (y) return x;\n" " x = a;\n" " y = 1;\n" " goto again;\n" "}"); ASSERT_EQUALS("", errout.str()); // #4040 - False positive valueFlowUninit("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 valueFlowUninit("int f() {\n" " int i = 0;\n" " int j{ i };\n" " return j;\n" "}"); ASSERT_EQUALS("", errout.str()); // Ticket #5646 valueFlowUninit("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 #8755 valueFlowUninit("void f(int b) {\n" " int a;\n" " if (b == 10)\n" " a = 1;\n" " if (b == 13)\n" " a = 1;\n" " if (b == 'x') {}\n" " if (a) {}\n" "}"); TODO_ASSERT_EQUALS("[test.cpp:8]: (error) Uninitialized variable: a\n", "", errout.str()); valueFlowUninit("void h() {\n" " int i;\n" " int* v = &i;\n" " sscanf(\"0\", \"%d\", v);\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void test(int p) {\n" " int f;\n" " if (p > 0)\n" " f = 0;\n" " if (p > 1)\n" " f += 1;\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("unsigned char get();\n" "char f() {\n" " unsigned char c;\n" " do {\n" " c = get();\n" " } while (isalpha(c) == 0);\n" " return static_cast(c);\n" "}\n"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void f(int x)\n" "{\n" " int i;\n" " char value;\n" " for(i = 0; i < 1; i++) {\n" " if(x > 1)\n" " value = 0;\n" " }\n" " printf(\"\", value);\n" "}\n"); ASSERT_EQUALS("[test.cpp:6] -> [test.cpp:9]: (error) Uninitialized variable: value\n", errout.str()); valueFlowUninit("void f(int x)\n" "{\n" " int i;\n" " char value;\n" " for(i = 0; i < 1; i++) {\n" " if(x > 1)\n" " value = 0;\n" " else\n" " value = 1;\n" " }\n" " printf(\"\", value);\n" "}\n"); ASSERT_EQUALS("", errout.str()); // function pointers valueFlowUninit("int f (const struct FileFuncDefs *ffd) {\n" // #10279 " int c;\n" " (*ffd->zread)(&c, 1);\n" " return c;\n" "}\n"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("int foo(unsigned int code) {\n" // #10279 " int res;\n\n" " (* (utility_table[code])) (&res);\n" " return (res);\n" "}\n"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("struct Archive {\n" " bool isNull;\n" " friend void operator&(const Archive &, bool &isNull);\n" "};\n" "void load(Archive& ar) {\n" " bool isNull;\n" " ar & isNull;\n" " if (!isNull) {}\n" "}\n"); ASSERT_EQUALS("", errout.str()); // #10119 valueFlowUninit("struct Foo {\n" " int i{};\n" " static const float cf;\n" "};\n" "const float Foo::cf = 0.1f;\n" "int bar() {\n" " Foo f;\n" " return f.i;\n" "}\n"); ASSERT_EQUALS("", errout.str()); // #10326 valueFlowUninit("void foo() {\n" " int cnt;\n" " do {\n" " cnt = 32 ;\n" " }\n" " while ( 0 ) ;\n" " if (cnt != 0) {}\n" "}\n"); ASSERT_EQUALS("", errout.str()); // #10327 - avoid extra warnings for uninitialized variable valueFlowUninit("void dowork( int me ) {\n" " if ( me == 0 ) {}\n" // <- not uninitialized "}\n" "\n" "int main() {\n" " int me;\n" " dowork(me);\n" // <- me is uninitialized "}"); ASSERT_EQUALS("[test.cpp:7]: (error) Uninitialized variable: me\n", errout.str()); valueFlowUninit("int foo() {\n" " int x;\n" " int a = x;\n" // <- x is uninitialized " return a;\n" // <- a has been initialized "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str()); // #10468 valueFlowUninit("uint32_t foo(uint32_t in) {\n" " uint32_t out, mask = 0x7F;\n" " while (mask ^ 0x7FFFFFFF)\n" " out = in & ~mask;\n" " return out;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void valueFlowUninitBreak() { // Do not show duplicate warnings about the same uninitialized value valueFlowUninit("struct wcsstruct {\n" " int *wcsprm;\n" "};\n" "\n" "void copy_wcs(wcsstruct *wcsin) {\n" " wcsstruct *x;\n" " memcpy(wcsin, x, sizeof(wcsstruct));\n" // <- warning " x->wcsprm = NULL;\n" // <- no warning "}"); ASSERT_EQUALS("[test.cpp:7]: (error) Uninitialized variable: x\n", errout.str()); valueFlowUninit("struct wcsstruct {\n" " int *wcsprm;\n" "};\n" "\n" "void copy_wcs(wcsstruct *wcsin) {\n" " wcsstruct *x;\n" " sizeof(x);\n" " x->wcsprm = NULL;\n" // <- Warn "}"); ASSERT_EQUALS("[test.cpp:8]: (error) Uninitialized variable: x\n", errout.str()); valueFlowUninit("struct wcsstruct {\n" " int *wcsprm;\n" "};\n" "\n" "void init_wcs(wcsstruct *x) { if (x->wcsprm != NULL); }\n" // <- no warning "\n" "void copy_wcs() {\n" " wcsstruct *x;\n" " x->wcsprm = NULL;\n" // <- warn here " init_wcs(x);\n" // <- no warning "}"); ASSERT_EQUALS("[test.cpp:9]: (error) Uninitialized variable: x\n", errout.str()); } void uninitvar_ipa() { // #8825 valueFlowUninit("typedef struct {\n" " int flags;\n" "} someType_t;\n" "void bar(const someType_t * const p) {\n" " if( (p->flags & 0xF000) == 0xF000){}\n" "}\n" "void f(void) {\n" " someType_t gVar;\n" " bar(&gVar);\n" "}"); ASSERT_EQUALS("[test.cpp:9] -> [test.cpp:5]: (error) Uninitialized variable: p->flags\n", errout.str()); valueFlowUninit("typedef struct\n" "{\n" " int flags[3];\n" "} someType_t;\n" "void f(void) {\n" " someType_t gVar;\n" " if(gVar.flags[1] == 42){}\n" "}"); ASSERT_EQUALS("[test.cpp:7]: (error) Uninitialized variable: gVar.flags\n", errout.str()); valueFlowUninit("void foo() {\n" // #10293 " union {\n" " struct hdr cm;\n" " char control[123];\n" " } u;\n" " char *x = u.control;\n" // <- no error "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("struct pc_data {\n" " struct {\n" " char * strefa;\n" " } wampiryzm;\n" "};\n" "void f() {\n" " struct pc_data *pcdata;\n" " if ( *pcdata->wampiryzm.strefa == '\\0' ) { }\n" "}"); ASSERT_EQUALS("[test.cpp:8]: (error) Uninitialized variable: pcdata\n", errout.str()); // # 9293 valueFlowUninit("struct S {\n" " int x;\n" " int y;\n" "};\n" "\n" "void f() {\n" " struct S s1;\n" " int * x = &s1.x;\n" " struct S s2 = {*x, 0};\n" "}"); ASSERT_EQUALS("[test.cpp:8] -> [test.cpp:9]: (error) Uninitialized variable: *x\n", errout.str()); valueFlowUninit("struct S {\n" " int x;\n" " int y;\n" "};\n" "\n" "void f() {\n" " struct S s1;\n" " struct S s2;\n" " int * x = &s1.x;\n" " s2.x = *x;\n" "}"); ASSERT_EQUALS("[test.cpp:9] -> [test.cpp:10]: (error) Uninitialized variable: *x\n", errout.str()); valueFlowUninit("void f(bool * x) {\n" " *x = false;\n" "}\n" "void g() {\n" " bool b;\n" " f(&b);\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void f(bool * x) {\n" " if (x != nullptr)\n" " x = 1;\n" "}\n" "void g() {\n" " bool x;\n" " f(&x);\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void f() {\n" " bool b;\n" " bool * x = &b;\n" " if (x != nullptr)\n" " x = 1;\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("struct A { bool b; };" "void f(A * x) {\n" " x->b = false;\n" "}\n" "void g() {\n" " A b;\n" " f(&b);\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("std::string f() {\n" " std::ostringstream ostr;\n" " ostr << \"\";\n" " return ostr.str();\n" "}"); ASSERT_EQUALS("", errout.str()); // #9281 valueFlowUninit("struct s {\n" " char a[20];\n" "};\n" "void c(struct s *sarg) {\n" " sarg->a[0] = '\\0';\n" "}\n" "void b(struct s *sarg) {\n" " c(sarg);\n" "}\n" "void a() {\n" " struct s s1;\n" " b(&s1);\n" "}"); ASSERT_EQUALS("", errout.str()); // # 9290 valueFlowUninit("struct A {\n" " double x;\n" "};\n" "double b() {\n" " A * c;\n" " c->x = 42;\n" " return c->x;\n" "}"); ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: c\n", errout.str()); valueFlowUninit("struct A {\n" " double x;\n" "};\n" "double b() {\n" " A c;\n" " c.x = 42;\n" " return c.x;\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("struct A {\n" " double x;\n" "};\n" "double d(A * e) {\n" " e->x = 42;\n" " return e->x;\n" "}\n" "double b() {\n" " A c;\n" " return d(&c);\n" "}"); ASSERT_EQUALS("", errout.str()); // # 9302 valueFlowUninit("struct VZ {\n" " double typ;\n" "};\n" "void read() {\n" " struct VZ vz;\n" " struct VZ* pvz = &vz;\n" " vz.typ = 42;\n" " if (pvz->typ == 0)\n" " return;\n" "}"); ASSERT_EQUALS("", errout.str()); // # 9305 valueFlowUninit("struct kf {\n" " double x;\n" "};\n" "void set(kf* k) {\n" " k->x = 0;\n" "}\n" "void cal() {\n" " KF b;\n" " KF* pb = &b;\n" " set( pb);\n" " if (pb->x)\n" " return;\n" "}"); ASSERT_EQUALS("", errout.str()); // # 9348 valueFlowUninit("void f(int *a) {\n" " int b = 0;\n" " memcpy(a, &b, sizeof(b));\n" "}\n" "void g() {\n" " int i;\n" " f(&i);\n" "}"); ASSERT_EQUALS("", errout.str()); // # 9631 valueFlowUninit("static void g(bool * result, int num, int num2, size_t * buflen) {\n" " if (*result && *buflen >= 5) {}\n" "}\n" "void f() {\n" " size_t bytesCopied;\n" " bool copied_all = true;\n" " g(&copied_all, 5, 6, &bytesCopied);\n" "}"); ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:2]: (error) Uninitialized variable: *buflen\n", errout.str()); } void valueFlowUninitStructMembers() { valueFlowUninit("struct AB { int a; int b; };\n" "void f(void) {\n" " struct AB ab;\n" " ab.a = 1;\n" " if (ab.b == 2) {}\n" "}\n"); ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: ab.b\n", errout.str()); valueFlowUninit("struct AB { int a; int b; };\n" "void do_something(const struct AB &ab) { a = ab.a; }\n" "void f(void) {\n" " struct AB ab;\n" " ab.a = 0;\n" " do_something(ab);\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("struct AB { int a; int b; };\n" "void do_something(const struct AB &ab) { a = ab.b; }\n" "void f(void) {\n" " struct AB ab;\n" " ab.a = 0;\n" " do_something(ab);\n" "}"); ASSERT_EQUALS("[test.cpp:6] -> [test.cpp:2]: (error) Uninitialized variable: ab.b\n", errout.str()); valueFlowUninit("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 variable: ab.a\n", errout.str()); valueFlowUninit("struct AB { int a; int b; };\n" "void f(void) {\n" " AB ab1;\n" " AB ab2 = { ab1.a, 0 };\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: ab1.a\n", errout.str()); valueFlowUninit("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 variable: ab.a\n", errout.str()); valueFlowUninit("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 variable: ab.b\n", errout.str()); valueFlowUninit("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] -> [test.c:5]: (error) Uninitialized variable: *(&ab).b\n", errout.str()); valueFlowUninit("void f(void) {\n" " struct AB ab;\n" " int x;\n" " ab.a = (void*)&x;\n" " dostuff(&ab,0);\n" "}\n", "test.c"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("struct 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()); valueFlowUninit("struct 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()); valueFlowUninit("struct 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()); valueFlowUninit("struct 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()); valueFlowUninit("struct 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()); valueFlowUninit("struct 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()); valueFlowUninit("struct 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()); valueFlowUninit("struct 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()); valueFlowUninit("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()); valueFlowUninit( "struct Cstring { char *text; int size, alloc; };\n" "int maybe();\n" "void f() {\n" " Cstring res;\n" " if ( ! maybe() ) return;\n" // <- fp goes away if this is removed " ( ((res).text = (void*)0), ((res).size = (res).alloc = 0) );\n" // <- fp goes away if parentheses are removed "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("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()); { valueFlowUninit("struct AB { char a[10]; };\n" "void f(void) {\n" " struct AB ab;\n" " strcpy(ab.a, STR);\n" "}\n", "test.c"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("struct AB { unsigned char a[10]; };\n" // #8999 - cast "void f(void) {\n" " struct AB ab;\n" " strcpy((char *)ab.a, STR);\n" "}\n", "test.c"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("struct AB { char a[10]; };\n" "void f(void) {\n" " struct AB ab;\n" " strcpy(x, ab.a);\n" "}\n", "test.c"); TODO_ASSERT_EQUALS("[test.c:4]: (error) Uninitialized variable: ab.a\n", "", errout.str()); valueFlowUninit("struct AB { int a; };\n" "void f(void) {\n" " struct AB ab;\n" " dosomething(ab.a);\n" "}\n", "test.c"); ASSERT_EQUALS("", errout.str()); } valueFlowUninit("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()); { // #6769 - calling method that might assign struct members valueFlowUninit("struct AB { int a; int b; void set(); };\n" "void f(void) {\n" " struct AB ab;\n" " ab.set();\n" " x = ab;\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("struct AB { int a; int get() const; };\n" "void f(void) {\n" " struct AB ab;\n" " ab.get();\n" " x = ab;\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: ab\n", errout.str()); valueFlowUninit("struct AB { int a; void dostuff() {} };\n" "void f(void) {\n" " struct AB ab;\n" " ab.dostuff();\n" " x = ab;\n" "}"); TODO_ASSERT_EQUALS("error", "", errout.str()); } valueFlowUninit("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()); valueFlowUninit("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()); valueFlowUninit("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" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("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()); valueFlowUninit("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()); valueFlowUninit("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()); valueFlowUninit("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" "}"); TODO_ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: abc.a\n" "[test.cpp:5]: (error) Uninitialized variable: abc.b\n" "[test.cpp:5]: (error) Uninitialized variable: abc.c\n", "", errout.str()); valueFlowUninit("struct ABC { int a; int b; int c; };\n" "void foo() {\n" " struct ABC abc;\n" " dostuff((uint32_t *)&abc.a);\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("void f(void) {\n" " struct tm t;\n" " t.tm_year = 123;\n" "}"); ASSERT_EQUALS("", errout.str()); // return valueFlowUninit("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 variable: ab.b\n", errout.str()); valueFlowUninit("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()); valueFlowUninit("struct S { int a; int b; };\n" // #8299 "void f(void) {\n" " struct S s;\n" " s.a = 0;\n" " return s;\n" "}\n"); ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: s.b\n", errout.str()); valueFlowUninit("struct S { int a; int b; };\n" // #9810 "void f(void) {\n" " struct S s;\n" " return s.a ? 1 : 2;\n" "}\n"); ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: s.a\n", errout.str()); // checkIfForWhileHead valueFlowUninit("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()); valueFlowUninit("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 variable: fred.b\n", errout.str()); valueFlowUninit("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 variable: fred.a\n", errout.str()); valueFlowUninit("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()); valueFlowUninit("void test2() {\n" " struct { char type; } s_d;\n" " if (foo(&s_d.type)){}\n" "}"); ASSERT_EQUALS("", errout.str()); // for valueFlowUninit("struct AB { int a; };\n" "void f() {\n" " struct AB ab;\n" " while (x) { clear(ab); z = ab.a; }\n" "}"); ASSERT_EQUALS("", errout.str()); valueFlowUninit("struct AB { int a; };\n" "void f() {\n" " struct AB ab;\n" " while (x) { ab.a = ab.a + 1; }\n" "}"); TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Uninitialized variable: ab.a\n", "", errout.str()); valueFlowUninit("struct AB { int a; };\n" "void f() {\n" " struct AB ab;\n" " while (x) { init(&ab); z = ab.a; }\n" "}"); ASSERT_EQUALS("", errout.str()); // address of member valueFlowUninit("struct AB { int a[10]; int b; };\n" "void f() {\n" " struct AB ab;\n" " int *p = ab.a;\n" "}"); ASSERT_EQUALS("", errout.str()); // Reference valueFlowUninit("struct A { int x; };\n" "void foo() {\n" " struct A a;\n" " int& x = a.x;\n" " x = 0;\n" " return a.x;\n" "}"); ASSERT_EQUALS("", errout.str()); // non static data-member initialization valueFlowUninit("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:4]: (error) Uninitialized variable: ab.a\n", errout.str()); // STL class member valueFlowUninit("struct A {\n" " std::map m;\n" " int i;\n" "};\n" "void foo() {\n" " A a;\n" " x = a.m;\n" "}"); ASSERT_EQUALS("", errout.str()); // Unknown type (C++) valueFlowUninit("struct A {\n" " C m;\n" " int i;\n" "};\n" "void foo() {\n" " A a;\n" " x = a.m;\n" "}", "test.cpp"); ASSERT_EQUALS("", errout.str()); // Unknown type (C) valueFlowUninit("struct A {\n" " C m;\n" " int i;\n" "};\n" "void foo() {\n" " A a;\n" " x = a.m;\n" "}", "test.c"); ASSERT_EQUALS("[test.c:7]: (error) Uninitialized variable: a.m\n", errout.str()); // Type with constructor valueFlowUninit("class C { C(); }\n" "struct A {\n" " C m;\n" " int i;\n" "};\n" "void foo() {\n" " A a;\n" " x = a.m;\n" "}"); ASSERT_EQUALS("", errout.str()); } void uninitvar_memberfunction() { // # 8715 valueFlowUninit("struct C {\n" " int x();\n" "};\n" "void f() {\n" " C *c;\n" " if (c->x() == 4) {}\n" "}"); ASSERT_EQUALS("[test.cpp:6]: (error) Uninitialized variable: c\n", errout.str()); valueFlowUninit("struct A { \n" " int i; \n" " void f();\n" "};\n" "void g() {\n" " A a;\n" " a.f();\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void uninitvar_nonmember() { valueFlowUninit("struct Foo {\n" " int bar;\n" "};\n" "\n" "int main() {\n" " Foo* foo;\n" " foo->bar = 3;\n" "}"); ASSERT_EQUALS("[test.cpp:7]: (error) Uninitialized variable: foo\n", errout.str()); } void isVariableUsageDeref() { // *p checkUninitVar("void f() {\n" " char a[10];\n" " char c = *a;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str()); // extracttests.start: extern const int SIZE; checkUninitVar("void f() {\n" " char a[SIZE+10];\n" " char c = *a;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str()); checkUninitVar("void f() {\n" " char a[10];\n" " *a += 10;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: a\n", errout.str()); checkUninitVar("void f() {\n" " int a[10][10];\n" " dostuff(*a);\n" "}"); ASSERT_EQUALS("", errout.str()); checkUninitVar("void f() {\n" " void (*fp[1]) (void) = {function1};\n" " (*fp[0])();\n" "}"); ASSERT_EQUALS("", errout.str()); } void ctu(const char code[]) { // Clear the error buffer.. errout.str(""); // Tokenize.. Tokenizer tokenizer(&settings, this); std::istringstream istr(code); tokenizer.tokenize(istr, "test.cpp"); CTU::FileInfo *ctu = CTU::getFileInfo(&tokenizer); // Check code.. std::list fileInfo; CheckUninitVar check(&tokenizer, &settings, this); fileInfo.push_back(check.getFileInfo(&tokenizer, &settings)); check.analyseWholeProgram(ctu, fileInfo, settings, *this); while (!fileInfo.empty()) { delete fileInfo.back(); fileInfo.pop_back(); } delete ctu; } void ctu() { // #9735 - FN ctu("typedef struct\n" "{\n" " int x;\n" " unsigned int flag : 1;\n" // bit filed gets never initialized "} status;\n" "bool foo(const status * const s)\n" "{\n" " return s->flag;\n" // << uninitvar "}\n" "void bar(const status * const s)\n" "{\n" " if( foo(s) == 1) {;}\n" "}\n" "void f(void)\n" "{\n" " status s;\n" " s.x = 42;\n" " bar(&s);\n" "}"); ASSERT_EQUALS("[test.cpp:18] -> [test.cpp:12] -> [test.cpp:8]: (error) Using argument s that points at uninitialized variable s\n", errout.str()); ctu("void f(int *p) {\n" " a = *p;\n" "}\n" "int main() {\n" " int x;\n" " f(&x);\n" "}"); ASSERT_EQUALS("[test.cpp:6] -> [test.cpp:2]: (error) Using argument p that points at uninitialized variable x\n", errout.str()); ctu("void use(int *p) { a = *p + 3; }\n" "void call(int x, int *p) { x++; use(p); }\n" "int main() {\n" " int x;\n" " call(4,&x);\n" "}"); ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:2] -> [test.cpp:1]: (error) Using argument p that points at uninitialized variable x\n", errout.str()); ctu("void dostuff(int *x, int *y) {\n" " if (!var)\n" " return -1;\n" // <- early return " *x = *y;\n" "}\n" "\n" "void f() {\n" " int x;\n" " dostuff(a, &x);\n" "}"); ASSERT_EQUALS("", errout.str()); ctu("void dostuff(int *x, int *y) {\n" " if (cond)\n" " *y = -1;\n" // <- conditionally written " *x = *y;\n" "}\n" "\n" "void f() {\n" " int x;\n" " dostuff(a, &x);\n" "}"); ASSERT_EQUALS("", errout.str()); ctu("void f(int *p) {\n" " a = sizeof(*p);\n" "}\n" "int main() {\n" " int x;\n" " f(&x);\n" "}"); ASSERT_EQUALS("", errout.str()); ctu("void f(int *v) {\n" " std::cin >> *v;\n" "}\n" "int main() {\n" " int x;\n" " f(&x);\n" "}"); // TODO ASSERT_EQUALS("", errout.str()); } }; REGISTER_TEST(TestUninitVar)