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Added more patterns to redundant condition check.

This commit is contained in:
pranav1509 2012-09-01 13:39:32 +02:00 committed by PKEuS
parent c20adf91bf
commit 6f6baa67e4
2 changed files with 47 additions and 0 deletions
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4
lib/checkother.cpp
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@ -1198,6 +1198,10 @@ void CheckOther::checkIncorrectLogicOperator()
{ "!!&&", { First, "<|<=" }, "%oror%", { First, "<|<=" }, "!!&&", MoreEqual, SecondTrue }, // (x < 5) || (x < 4) <- second expression always true
{ 0, { First, ">|>=" }, "&&", { First, ">|>=" }, 0, MoreEqual, SecondTrue }, // (x > 4) && (x > 5) <- second expression always true
{ 0, { First, "<|<=" }, "&&", { First, "<|<=" }, 0, MoreEqual, SecondTrue }, // (x < 5) && (x < 4) <- second expression always true
{ 0, { NA, "==" }, "&&", { NA, "!=" }, 0, NotEqual, SecondTrue }, // (x == 3) && (x != 4) <- second expression always true
{ "!!&&", { NA, "==" }, "%oror%", { NA, "!=" }, "!!&&", NotEqual, SecondTrue }, // (x == 3) || (x != 4) <- second expression always true
{ 0, { NA, "!=" }, "&&", { NA, "==" }, 0, Equal, AlwaysFalse }, // (x != 3) && (x == 3) <- expression always false
{ "!!&&", { NA, "!=" }, "%oror%", { NA, "==" }, "!!&&", Equal, AlwaysTrue }, // (x != 3) || (x == 3) <- expression always true
};
for (unsigned int i = 0; i < (sizeof(conditions) / sizeof(conditions[0])); i++) {

43
test/testother.cpp
View File

@ -3287,6 +3287,49 @@ private:
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical disjunction always evaluates to true: x > 3 || x <= 3.\n", errout.str());
check("void f(int x) {\n"
" if((x==3) && (x!=4))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant condition: If x == 3, the comparison x != 4 is always true.\n", errout.str());
check("void f(int x) {\n"
" if ((x!=4) && (x==3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant condition: If x == 3, the comparison x != 4 is always true.\n", errout.str());
check("void f(int x) {\n"
" if ((x==3) || (x!=4))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant condition: If x == 3, the comparison x != 4 is always true.\n", errout.str());
check("void f(int x) {\n"
" if ((x!=4) || (x==3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant condition: If x == 3, the comparison x != 4 is always true.\n", errout.str());
check("void f(int x) {\n"
" if ((x==3) && (x!=3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x != 3 && x == 3.\n", errout.str());
check("void f(int x) {\n"
" if ((x==6) || (x!=6))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical disjunction always evaluates to true: x != 6 || x == 6.\n", errout.str());
check("void f(int x) {\n"
" if (x > 10 || x < 3)\n"
" a++;\n"