131 lines
3.5 KiB
C++
131 lines
3.5 KiB
C++
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// Check for dangerous division..
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// such as "svar / uvar". Treating "svar" as unsigned data is not good
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#include "tokenize.h"
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#include "CheckOther.h"
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#include "MiniCppUnit.h"
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#include <sstream>
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extern std::ostringstream errout;
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extern bool ShowAll;
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class TestDivision : public TestFixture<TestDivision>
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{
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private:
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void check( const char code[] )
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{
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// Tokenize..
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tokens = tokens_back = NULL;
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std::istringstream istr(code);
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TokenizeCode( istr );
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//SimplifyTokenList(); <- this can't be used as it removes 'unsigned'
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// Clear the error buffer..
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errout.str("");
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// Check for memory leaks..
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ShowAll = true;
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CheckUnsignedDivision();
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}
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public:
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TEST_FIXTURE( TestDivision )
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{
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TEST_CASE( division1 );
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TEST_CASE( division2 );
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TEST_CASE( division3 );
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TEST_CASE( division4 );
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TEST_CASE( division5 );
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TEST_CASE( division6 );
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TEST_CASE( division7 );
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}
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void division1()
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{
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check( "void f()\n"
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"{\n"
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" int ivar = -2;\n"
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" unsigned int uvar = 2;\n"
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" return ivar / uvar;\n"
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"}\n" );
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ASSERT_EQUALS( std::string("[test.cpp:5]: Warning: Division with signed and unsigned operators\n"), errout.str() );
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}
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void division2()
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{
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check( "void f()\n"
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"{\n"
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" int ivar = -2;\n"
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" unsigned int uvar = 2;\n"
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" return uvar / ivar;\n"
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"}\n" );
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ASSERT_EQUALS( std::string("[test.cpp:5]: Warning: Division with signed and unsigned operators\n"), errout.str() );
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}
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void division3()
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{
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check( "typedef int s32;\n"
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"typedef unsigned int u32;\n"
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"void f()\n"
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"{\n"
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" s32 ivar = -2;\n"
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" u32 uvar = 2;\n"
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" return uvar / ivar;\n"
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"}\n" );
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ASSERT_EQUALS( std::string("[test.cpp:7]: Warning: Division with signed and unsigned operators\n"), errout.str() );
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}
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void division4()
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{
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check( "void f1()\n"
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"{\n"
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" int i1;\n"
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"}\n"
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"\n"
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"void f2(unsigned int i1)\n"
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"{\n"
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" unsigned int i2;\n"
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" result = i2 / i1;\n"
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);
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ASSERT_EQUALS( std::string(""), errout.str() );
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}
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void division5()
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{
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check( "#define USER_HASH (16)\n"
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"void foo()\n"
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"{\n"
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" unsigned int val = 32;\n"
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" val = val / USER_HASH;\n"
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);
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ASSERT_EQUALS( std::string(""), errout.str() );
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}
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void division6()
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{
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check( "void foo()\n"
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"{\n"
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" unsigned int val = 32;\n"
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" int i = val / -2;\n"
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);
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ASSERT_EQUALS( std::string("[test.cpp:4]: Unsigned division. The result will be wrong.\n"), errout.str() );
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}
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void division7()
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{
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check( "void foo()\n"
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"{\n"
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" unsigned int val = 32;\n"
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" int i = -96 / val;\n"
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);
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ASSERT_EQUALS( std::string("[test.cpp:4]: Unsigned division. The result will be wrong.\n"), errout.str() );
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}
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};
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REGISTER_FIXTURE( TestDivision )
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