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Minor tweak for redundantVariableAssignment

This commit is contained in:
Daniel Marjamäki 2018-11-26 11:16:50 +01:00
parent e20079a5d9
commit affd03f1d6
2 changed files with 20 additions and 14 deletions
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20
lib/checkother.cpp
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@ -560,13 +560,25 @@ void CheckOther::checkRedundantAssignment()
if (tok->astParent())
continue;
// Do not warn about redundant initialization
// Do not warn about redundant initialization when rhs is trivial
// TODO : do not simplify the variable declarations
if (Token::Match(tok->tokAt(-3), "%var% ; %var% =") && tok->previous()->variable() && tok->previous()->variable()->nameToken() == tok->tokAt(-3))
continue;
if (Token::Match(tok->tokAt(-3), "%var% ; %var% =") && tok->previous()->variable() && tok->previous()->variable()->nameToken() == tok->tokAt(-3) && tok->tokAt(-3)->linenr() == tok->previous()->linenr()) {
bool trivial = true;
visitAstNodes(tok->astOperand2(),
[&](const Token *rhs) {
if (Token::Match(rhs, "%str%|%num%|%name%"))
return ChildrenToVisit::op1_and_op2;
if (rhs->str() == "(" && !rhs->previous()->isName())
return ChildrenToVisit::op1_and_op2;
trivial = false;
return ChildrenToVisit::done;
});
if (trivial)
continue;
}
// Do not warn about assignment with 0 / NULL
if (Token::simpleMatch(tok->astOperand2(), "0"))
if (Token::Match(tok->astOperand2(), "0|NULL|nullptr"))
continue;
if (tok->astOperand1()->variable() && tok->astOperand1()->variable()->isReference())

14
test/testother.cpp
View File

@ -5602,15 +5602,13 @@ private:
check("void f() {\n"
" int i;\n"
" dostuff();\n"
" i = 1;\n"
" i = 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:5]: (style) Variable 'i' is reassigned a value before the old one has been used.\n", errout.str());
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (style) Variable 'i' is reassigned a value before the old one has been used.\n", errout.str());
check("void f() {\n"
" static int i;\n"
" dostuff();\n"
" i = 1;\n"
" i = 1;\n"
"}");
@ -5686,12 +5684,11 @@ private:
check("void f() {\n"
" int i;\n"
" dostuff();\n"
" i = 1;\n"
" bar();\n"
" i = 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:6]: (style) Variable 'i' is reassigned a value before the old one has been used.\n", errout.str());
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:5]: (style) Variable 'i' is reassigned a value before the old one has been used.\n", errout.str());
check("void bar(int i) {}\n"
"void f(int i) {\n"
@ -5778,17 +5775,15 @@ private:
// from #3103 (avoid a false negative)
check("int foo(){\n"
" int x;\n"
" dostuff();\n"
" x = 1;\n"
" x = 1;\n"
" return x + 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:5]: (style) Variable 'x' is reassigned a value before the old one has been used.\n", errout.str());
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (style) Variable 'x' is reassigned a value before the old one has been used.\n", errout.str());
// from #3103 (avoid a false positive)
check("int foo(){\n"
" int x;\n"
" dostuff();\n"
" x = 1;\n"
" if (y)\n" // <-- cppcheck does not know anything about 'y'
" x = 2;\n"
@ -6016,11 +6011,10 @@ private:
check("class C { void operator=(int x); };\n" // #8368 - assignment operator might have side effects => inconclusive
"void f() {\n"
" C c;\n"
" dostuff();\n"
" c = x;\n"
" c = x;\n"
"}");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:6]: (style, inconclusive) Variable 'c' is reassigned a value before the old one has been used if variable is no semaphore variable.\n", errout.str());
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:5]: (style, inconclusive) Variable 'c' is reassigned a value before the old one has been used if variable is no semaphore variable.\n", errout.str());
}
void redundantVarAssignment_stackoverflow() {