/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2010 Daniel Marjamäki and Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
// Check for unused variables..
#include "testsuite.h"
#include "tokenize.h"
#include "checkother.h"
#include
extern std::ostringstream errout;
class TestUnusedVar : public TestFixture
{
public:
TestUnusedVar() : TestFixture("TestUnusedVar")
{ }
private:
void check(const char code[])
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// Clear the error buffer..
errout.str("");
// Check for unused variables..
Settings settings;
settings._checkCodingStyle = true;
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.checkStructMemberUsage();
}
void run()
{
TEST_CASE(structmember1);
TEST_CASE(structmember2);
TEST_CASE(structmember3);
TEST_CASE(structmember4);
TEST_CASE(structmember5);
TEST_CASE(structmember6);
TEST_CASE(structmember7);
TEST_CASE(structmember8);
TEST_CASE(structmember_extern); // No false positives for extern structs
TEST_CASE(localvar1);
TEST_CASE(localvar2);
TEST_CASE(localvar3);
TEST_CASE(localvar4);
TEST_CASE(localvar5);
TEST_CASE(localvar6);
TEST_CASE(localvar7);
TEST_CASE(localvar8);
TEST_CASE(localvar9); // ticket #1605
TEST_CASE(localvar10);
TEST_CASE(localvar11);
TEST_CASE(localvar12);
TEST_CASE(localvaralias1);
TEST_CASE(localvaralias2); // ticket #1637
TEST_CASE(localvarasm);
// Don't give false positives for variables in structs/unions
TEST_CASE(localvarStruct1);
TEST_CASE(localvarStruct2);
TEST_CASE(localvarStruct3);
TEST_CASE(localvarStruct4); // Ticket #31: sigsegv on incomplete struct
TEST_CASE(localvarOp); // Usage with arithmetic operators
TEST_CASE(localvarInvert); // Usage with inverted variable
TEST_CASE(localvarIf); // Usage in if
TEST_CASE(localvarIfElse); // return tmp1 ? tmp2 : tmp3;
TEST_CASE(localvarOpAssign); // a |= b;
TEST_CASE(localvarFor); // for ( ; var; )
TEST_CASE(localvarShift); // 1 >> var
}
void structmember1()
{
check("struct abc\n"
"{\n"
" int a;\n"
" int b;\n"
" int c;\n"
"};\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) struct or union member 'abc::a' is never used\n"
"[test.cpp:4]: (style) struct or union member 'abc::b' is never used\n"
"[test.cpp:5]: (style) struct or union member 'abc::c' is never used\n"), errout.str());
}
void structmember2()
{
check("struct ABC\n"
"{\n"
" int a;\n"
" int b;\n"
" int c;\n"
"};\n"
"\n"
"void foo()\n"
"{\n"
" struct ABC abc;\n"
" int a = abc.a;\n"
" int b = abc.b;\n"
" int c = abc.c;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void structmember3()
{
check("struct ABC\n"
"{\n"
" int a;\n"
" int b;\n"
" int c;\n"
"};\n"
"\n"
"static struct ABC abc[] = { {1, 2, 3} };\n"
"\n"
"void foo()\n"
"{\n"
" int a = abc[0].a;\n"
" int b = abc[0].b;\n"
" int c = abc[0].c;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void structmember4()
{
check("struct ABC\n"
"{\n"
" const int a;\n"
"};\n"
"\n"
"void foo()\n"
"{\n"
" ABC abc;\n"
" if (abc.a == 2);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void structmember5()
{
check("struct AB\n"
"{\n"
" int a;\n"
" int b;\n"
" void reset()\n"
" {\n"
" a = 1;\n"
" b = 2;\n"
" }\n"
"};\n"
"\n"
"void foo()\n"
"{\n"
" struct AB ab;\n"
" ab.reset();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void structmember6()
{
check("struct AB\n"
"{\n"
" int a;\n"
" int b;\n"
"};\n"
"\n"
"void foo(char *buf)\n"
"{\n"
" struct AB *ab = (struct AB *)&buf[10];\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct AB\n"
"{\n"
" int a;\n"
" int b;\n"
"};\n"
"\n"
"void foo(char *buf)\n"
"{\n"
" struct AB *ab = (AB *)&buf[10];\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void structmember7()
{
check("struct AB\n"
"{\n"
" int a;\n"
" int b;\n"
"};\n"
"\n"
"void foo(struct AB *ab)\n"
"{\n"
" ab->a = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct AB\n"
"{\n"
" int a;\n"
" int b;\n"
"};\n"
"\n"
"void foo(struct AB _shuge *ab)\n"
"{\n"
" ab->a = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void structmember8()
{
check("struct AB\n"
"{\n"
" int a;\n"
" int b;\n"
"};\n"
"\n"
"void foo(char *ab)\n"
"{\n"
" ((AB *)ab)->b = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void structmember_extern()
{
// extern struct => no false positive
check("extern struct AB\n"
"{\n"
" int a;\n"
" int b;\n"
"} ab;\n"
"\n"
"void foo()\n"
"{\n"
" ab.b = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// global linkage => no false positive
check("struct AB\n"
"{\n"
" int a;\n"
" int b;\n"
"} ab;\n"
"\n"
"void foo()\n"
"{\n"
" ab.b = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// static linkage => error message
check("static struct AB\n"
"{\n"
" int a;\n"
" int b;\n"
"} ab;\n"
"\n"
"void foo()\n"
"{\n"
" ab.b = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) struct or union member 'AB::a' is never used\n", errout.str());
}
void functionVariableUsage(const char code[])
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// Clear the error buffer..
errout.str("");
// Check for unused variables..
Settings settings;
settings._checkCodingStyle = true;
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.functionVariableUsage();
}
void localvar1()
{
functionVariableUsage("void foo()\n"
"{\n"
" int i = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i(0);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i(a);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int j = 0;\n"
" int i(j);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int j = 0;\n"
" int & i = j;\n"
" j = j;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int j = 0;\n"
" const int & i = j;\n"
" j = j;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int j = 0;\n"
" int & i(j);\n"
" j = j;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int j = 0;\n"
" const int & i(j);\n"
" j = j;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int * j = 0;\n"
" int * i(j);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int * j = 0;\n"
" const int * i(j);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" bool i = false;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" bool i = true;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" char *i;\n"
" i = fgets();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
// undefined variables are not reported because they may be classes with constructors
functionVariableUsage("undefined foo()\n"
"{\n"
" undefined i = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i = undefined;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int * i = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" void * i = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" const void * i = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" struct S * i = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" const struct S * i = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" struct S & i = j;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" const struct S & i = j;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" undefined * i = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i = 0;\n"
" int j = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'j' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i[10] = { 0 };\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo(int n)\n"
"{\n"
" int i[n] = { 0 };\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" char i[10] = \"123456789\";\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" char *i = \"123456789\";\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
}
void localvar2()
{
functionVariableUsage("int foo()\n"
"{\n"
" int i;\n"
" return i;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n"), errout.str());
functionVariableUsage("bool foo()\n"
"{\n"
" bool i;\n"
" return i;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n"), errout.str());
// undefined variables are not reported because they may be classes with constructors
functionVariableUsage("undefined foo()\n"
"{\n"
" undefined i;\n"
" return i;\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
functionVariableUsage("undefined *foo()\n"
"{\n"
" undefined * i;\n"
" return i;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n"), errout.str());
functionVariableUsage("int *foo()\n"
"{\n"
" int * i;\n"
" return i;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n"), errout.str());
functionVariableUsage("const int *foo()\n"
"{\n"
" const int * i;\n"
" return i;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n"), errout.str());
functionVariableUsage("struct S *foo()\n"
"{\n"
" struct S * i;\n"
" return i;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n"), errout.str());
functionVariableUsage("const struct S *foo()\n"
"{\n"
" const struct S * i;\n"
" return i;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n"), errout.str());
// assume f() can write a
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" f(a[0]);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// assume f() can write a
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" f(a[0], 0);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// assume f() can write a
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" f(0, a[0]);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// assume f() can write a
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" f(0, a[0], 0);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// f() can not write a (not supported yet)
functionVariableUsage("void f(int i) { }\n"
"void foo()\n"
"{\n"
" int a[10];\n"
" f(a[0]);\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'a' is not assigned a value\n", errout.str());
// f() can not write a (not supported yet)
functionVariableUsage("void f(const int & i) { }\n"
"void foo()\n"
"{\n"
" int a[10];\n"
" f(a[0]);\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'a' is not assigned a value\n", errout.str());
// f() writes a
functionVariableUsage("void f(int & i) { }\n"
"void foo()\n"
"{\n"
" int a[10];\n"
" f(a[0]);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void localvar3()
{
functionVariableUsage("void foo()\n"
"{\n"
" int i;\n"
" if ( abc )\n"
" ;\n"
" else i = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n"), errout.str());
}
void localvar4()
{
functionVariableUsage("void foo()\n"
"{\n"
" int i = 0;\n"
" f(i);\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i = 0;\n"
" f(&i);\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
}
void localvar5()
{
functionVariableUsage("void foo()\n"
"{\n"
" int a = 0;\n"
" b = (char)a;\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
}
void localvar6()
{
functionVariableUsage("void foo()\n"
"{\n"
" int b[10];\n"
" for (int i=0;i<10;++i)\n"
" b[i] = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'b' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a = 0;\n"
" int b[10];\n"
" for (int i=0;i<10;++i)\n"
" b[i] = ++a;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:4]: (style) Variable 'b' is assigned a value that is never used\n"), errout.str());
}
void localvar7()// ticket 1253
{
functionVariableUsage("void foo()\n"
"{\n"
" int i;\n"
" i--;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i;\n"
" int &ii(i);\n"
" ii--;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i;\n"
" int &ii=i;\n"
" ii--;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'i' is not assigned a value\n"), errout.str());
}
void localvar8()
{
functionVariableUsage("void foo()\n"
"{\n"
" int i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i[2];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" void * i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" const void * i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" A * i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" struct A * i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" const struct A * i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int * i[2];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" const int * i[2];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" void * i[2];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" const void * i[2];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" struct A * i[2];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" const struct A * i[2];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo(int n)\n"
"{\n"
" int i[n];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i = 0;\n"
" int &j = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n"
"[test.cpp:4]: (style) Variable 'j' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i;\n"
" int &j = i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n"
"[test.cpp:4]: (style) Variable 'j' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i;\n"
" int &j = i;\n"
" j = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" A * i;\n"
" i->f();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" char * i;\n"
" if (i);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" char * i = 0;\n"
" if (i);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" char * i = new char[10];\n"
" if (i);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" char *i;\n"
" f(i);\n"
"}\n");
functionVariableUsage("int a;\n"
"void foo()\n"
"{\n"
" return &a;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("int a[10];\n"
"void foo()\n"
"{\n"
" int *p = a;\n"
" for (int i = 0; i < 10; i++)\n"
" p[i] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("int a[10];\n"
"void foo()\n"
"{\n"
" int *p = &a[0];\n"
" for (int i = 0; i < 10; i++)\n"
" p[i] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" int x;\n"
" a[0] = 0;\n"
" x = a[0];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'x' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a, b, c;\n"
" a = b = c = 0;\n"
"}\n");
ASSERT_EQUALS(
"[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"
"[test.cpp:3]: (style) Variable 'b' is assigned a value that is never used\n"
"[test.cpp:3]: (style) Variable 'c' is assigned a value that is never used\n",
errout.str());
functionVariableUsage("int * foo()\n"
"{\n"
" return &undefined[0];\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void localvar9()
{
// ticket #1605
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" for (int i = 0; i < 10; )\n"
" a[i++] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str());
}
void localvar10()
{
functionVariableUsage("void foo(int x)\n"
"{\n"
" int i;\n"
" if (x) {\n"
" int i;\n"
" } else {\n"
" int i;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n"
"[test.cpp:5]: (style) Unused variable: i\n"
"[test.cpp:7]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo(int x)\n"
"{\n"
" int i;\n"
" if (x)\n"
" int i;\n"
" else\n"
" int i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n"
"[test.cpp:5]: (style) Unused variable: i\n"
"[test.cpp:7]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo(int x)\n"
"{\n"
" int i;\n"
" if (x) {\n"
" int i;\n"
" } else {\n"
" int i = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n"
"[test.cpp:5]: (style) Unused variable: i\n"
"[test.cpp:7]: (style) Variable 'i' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo(int x)\n"
"{\n"
" int i;\n"
" if (x) {\n"
" int i;\n"
" } else {\n"
" int i;\n"
" }\n"
" i = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used\n"
"[test.cpp:5]: (style) Unused variable: i\n"
"[test.cpp:7]: (style) Unused variable: i\n", errout.str());
}
void localvar11()
{
functionVariableUsage("void foo(int x)\n"
"{\n"
" int a = 0;\n"
" if (x == 1)\n"
" {\n"
" a = 123;\n" // redundant assignment
" return;\n"
" }\n"
" x = a;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// The variable 'a' is initialized. But the initialized value is
// never used. It is only initialized for security reasons.
functionVariableUsage("void foo(int x)\n"
"{\n"
" int a = 0;\n"
" if (x == 1)\n"
" a = 123;\n"
" else if (x == 2)\n"
" a = 456;\n"
" else\n"
" return;\n"
" x = a;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void localvar12()
{
// ticket #1574
functionVariableUsage("void foo()\n"
"{\n"
" int a, b, c, d, e, f;\n"
" a = b = c = d = e = f = 0;\n"
"\n"
"}\n");
ASSERT_EQUALS(
"[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"
"[test.cpp:3]: (style) Variable 'b' is assigned a value that is never used\n"
"[test.cpp:3]: (style) Variable 'c' is assigned a value that is never used\n"
"[test.cpp:3]: (style) Variable 'd' is assigned a value that is never used\n"
"[test.cpp:3]: (style) Variable 'e' is assigned a value that is never used\n"
"[test.cpp:3]: (style) Variable 'f' is assigned a value that is never used\n",
errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a, b, c = 0;\n"
" a = b = c;\n"
"\n"
"}\n");
ASSERT_EQUALS(
"[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"
"[test.cpp:3]: (style) Variable 'b' is assigned a value that is never used\n",
errout.str());
TODO_ASSERT_EQUALS(
"[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"
"[test.cpp:3]: (style) Variable 'b' is assigned a value that is never used\n"
"[test.cpp:3]: (style) Variable 'c' is assigned a value that is never used\n",
errout.str());
}
void localvaralias1()
{
functionVariableUsage("void foo()\n"
"{\n"
" int a;\n"
" int *b = &a;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Unused variable: a\n"
"[test.cpp:4]: (style) Variable 'b' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" int *b = a;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Unused variable: a\n"
"[test.cpp:4]: (style) Variable 'b' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a;\n"
" int *b = &a;\n"
" *b = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a;\n"
" char *b = (char *)&a;\n"
" *b = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a;\n"
" char *b = (char *)(&a);\n"
" *b = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a;\n"
" const char *b = (const char *)&a;\n"
" *b = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a;\n"
" const char *b = (const char *)(&a);\n"
" *b = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a;\n"
" char *b = static_cast(&a);\n"
" *b = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a;\n"
" const char *b = static_cast(&a);\n"
" *b = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"), errout.str());
// a is not a local variable and b is aliased to it (not supported yet)
functionVariableUsage("int a;\n"
"void foo()\n"
"{\n"
" int *b = &a;\n"
"}\n");
TODO_ASSERT_EQUALS(std::string("[test.cpp:4]: (style) Variable 'b' is assigned a value that is never used\n"), errout.str());
// a is not a local variable and b is aliased to it (not supported yet)
functionVariableUsage("void foo(int a)\n"
"{\n"
" int *b = &a;\n"
"}\n");
TODO_ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'b' is assigned a value that is never used\n"), errout.str());
// a is not a local variable and b is aliased to it (not supported yet)
functionVariableUsage("class A\n"
"{\n"
" int a;\n"
" void foo()\n"
" {\n"
" int *b = &a;\n"
" }\n"
"}\n");
TODO_ASSERT_EQUALS(std::string("[test.cpp:6]: (style) Variable 'b' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("int a;\n"
"void foo()\n"
"{\n"
" int *b = &a;\n"
" *b = 0;\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
functionVariableUsage("void foo(int a)\n"
"{\n"
" int *b = &a;\n"
" *b = 0;\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
functionVariableUsage("class A\n"
"{\n"
" int a;\n"
" void foo()\n"
" {\n"
" int *b = &a;\n"
" *b = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" int *b = a;\n"
" *b = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" char *b = (char *)a;\n"
" *b = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" char *b = (char *)(a);\n"
" *b = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" const char *b = (const char *)a;\n"
" *b = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" const char *b = (const char *)(a);\n"
" *b = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" char *b = static_cast(a);\n"
" *b = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" const char *b = static_cast(a);\n"
" *b = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("int a[10];\n"
"void foo()\n"
"{\n"
" int *b = a;\n"
" *b = 0;\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
functionVariableUsage("void foo(int a[10])\n"
"{\n"
" int *b = a;\n"
" *b = 0;\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
functionVariableUsage("class A\n"
"{\n"
" int a[10];\n"
" void foo()\n"
" {\n"
" int *b = a;\n"
" *b = 0;\n"
" }\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" int *b = a;\n"
" int *c = b;\n"
" *c = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" int b[10];\n"
" int *c = a;\n"
" int *d = b;\n"
" *d = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Unused variable: a\n"
"[test.cpp:4]: (style) Variable 'b' is assigned a value that is never used\n"
"[test.cpp:5]: (style) Variable 'c' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" int b[10];\n"
" int *c = a;\n"
" c = b;\n"
" *c = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Unused variable: a\n"
"[test.cpp:4]: (style) Variable 'b' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" int b[10];\n"
" int *c = a;\n"
" c = b;\n"
" *c = 0;\n"
" c = a;\n"
" *c = 0;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"
"[test.cpp:4]: (style) Variable 'b' is assigned a value that is never used\n"), errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10], * b = a + 10;\n"
" b[-10] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10], * b = a + 10;\n"
" b[-10] = 0;\n"
" int * c = b - 10;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"
"[test.cpp:5]: (style) Variable 'c' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10], * b = a + 10;\n"
" int * c = b - 10;\n"
" x = c[0];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is not assigned a value\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10], * b = a + 10;\n"
" int * c = b - 10;\n"
" c[1] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10], * b = a + 10;\n"
" int * c = b - 10;\n"
" c[1] = c[0];\n"
"}\n");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a[10], * b = a + 10;\n"
" int * c = b - 10;\n"
" int d = c[0];\n"
" f(d);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' is not assigned a value\n", errout.str());
functionVariableUsage("struct S { char c[100]; };\n"
"void foo()\n"
"{\n"
" char a[100];\n"
" struct S * s = (struct S *)a;\n"
" s->c[0] = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("struct S { char c[100]; };\n"
"void foo()\n"
"{\n"
" char a[100];\n"
" struct S * s = (struct S *)a;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Unused variable: a\n"
"[test.cpp:5]: (style) Variable 's' is assigned a value that is never used\n", errout.str());
functionVariableUsage("struct S { char c[100]; };\n"
"void foo()\n"
"{\n"
" char a[100];\n"
" const struct S * s = (const struct S *)a;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Unused variable: a\n"
"[test.cpp:5]: (style) Variable 's' is assigned a value that is never used\n", errout.str());
functionVariableUsage("struct S { char c[100]; };\n"
"void foo()\n"
"{\n"
" char a[100];\n"
" struct S * s = static_cast(a);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Unused variable: a\n"
"[test.cpp:5]: (style) Variable 's' is assigned a value that is never used\n", errout.str());
functionVariableUsage("struct S { char c[100]; };\n"
"void foo()\n"
"{\n"
" char a[100];\n"
" const struct S * s = static_cast(a);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Unused variable: a\n"
"[test.cpp:5]: (style) Variable 's' is assigned a value that is never used\n", errout.str());
}
void localvaralias2() // ticket 1637
{
functionVariableUsage("void foo()\n"
"{\n"
" int * a;\n"
" a = a;\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
}
void localvarasm()
{
functionVariableUsage("void foo(int &b)\n"
"{\n"
" int a;\n"
" asm();\n"
" b = a;\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
}
void localvarStruct1()
{
functionVariableUsage("void foo()\n"
"{\n"
" static const struct{ int x, y, w, h; } bounds = {1,2,3,4};\n"
" return bounds.x + bounds.y + bounds.w + bounds.h;\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
}
void localvarStruct2()
{
functionVariableUsage("void foo()\n"
"{\n"
" struct ABC { int a, b, c; };\n"
" struct ABC abc = { 1, 2, 3 };\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
}
void localvarStruct3()
{
functionVariableUsage("void foo()\n"
"{\n"
" int a = 10;\n"
" union { struct { unsigned char x; }; unsigned char z; };\n"
" do {\n"
" func();\n"
" } while(a--);\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:4]: (style) Unused variable: z\n"), errout.str());
}
void localvarStruct4()
{
/* This must not SIGSEGV: */
// FIXME!!
//functionVariableUsage("void foo()\n"
// "{\n"
// " struct { \n");
}
void localvarOp()
{
const char op[] = "+-*/%&|^";
for (const char *p = op; *p; ++p)
{
std::string code("int main()\n"
"{\n"
" int tmp = 10;\n"
" return 123 " + std::string(1, *p) + " tmp;\n"
"}\n");
functionVariableUsage(code.c_str());
ASSERT_EQUALS(std::string(""), errout.str());
}
}
void localvarInvert()
{
functionVariableUsage("int main()\n"
"{\n"
" int tmp = 10;\n"
" return ~tmp;\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
}
void localvarIf()
{
functionVariableUsage("int main()\n"
"{\n"
" int tmp = 10;\n"
" if ( tmp )\n"
" return 1;\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
}
void localvarIfElse()
{
functionVariableUsage("int foo()\n"
"{\n"
" int tmp1 = 1;\n"
" int tmp2 = 2;\n"
" int tmp3 = 3;\n"
" return tmp1 ? tmp2 : tmp3;\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
}
void localvarOpAssign()
{
functionVariableUsage("void foo()\n"
"{\n"
" int a = 1;\n"
" int b = 2;\n"
" a |= b;\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:3]: (style) Variable 'a' is assigned a value that is never used\n"), errout.str());
}
void localvarFor()
{
functionVariableUsage("void foo()\n"
"{\n"
" int a = 1;\n"
" for (;a;);\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
}
void localvarShift()
{
functionVariableUsage("int foo()\n"
"{\n"
" int var = 1;\n"
" return 1 >> var;\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
}
};
REGISTER_TEST(TestUnusedVar)