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Fix #8862 Enhancement: false negative: variablescope #6294

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merged 5 commits into from
Apr 15, 2024
Merged

Fix #8862 Enhancement: false negative: variablescope #6294

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bbe8667
Update checkother.cpp
chrchr-github Apr 15, 2024
6730be6
Update testother.cpp
chrchr-github Apr 15, 2024
f244e79
Update testother.cpp
chrchr-github Apr 15, 2024
676b05c
Update checkother.cpp
chrchr-github Apr 15, 2024
c6026d5
Update testother.cpp
chrchr-github Apr 15, 2024
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4 changes: 4 additions & 0 deletions lib/checkother.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -915,6 +915,10 @@ static bool isSimpleExpr(const Token* tok, const Variable* var, const Settings*
if (Token::Match(ftok, "%name% (") &&
((ftok->function() && ftok->function()->isConst()) || settings->library.isFunctionConst(ftok->str(), /*pure*/ true)))
needsCheck = true;
if (tok->isArithmeticalOp() &&
(!tok->astOperand1() || isSimpleExpr(tok->astOperand1(), var, settings)) &&
(!tok->astOperand2() || isSimpleExpr(tok->astOperand2(), var, settings)))
return true;
}
return (needsCheck && !findExpressionChanged(tok, tok->astParent(), var->scope()->bodyEnd, settings));
}
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23 changes: 23 additions & 0 deletions test/testother.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -100,6 +100,7 @@ class TestOther : public TestFixture {
TEST_CASE(varScope37); // #12158
TEST_CASE(varScope38);
TEST_CASE(varScope39);
TEST_CASE(varScope40);

TEST_CASE(oldStylePointerCast);
TEST_CASE(invalidPointerCast);
Expand Down Expand Up @@ -1710,6 +1711,28 @@ class TestOther : public TestFixture {
ASSERT_EQUALS("", errout_str());
}

void varScope40() {
checkP("#define NUM (-999.9)\n"
"double f(int i) {\n"
" double a = NUM;\n"
" double b = -NUM;\n"
" double c = -1.0 * NUM;\n"
" if (i == 1) {\n"
" return a;\n"
" }\n"
" if (i == 2) {\n"
" return b;\n"
" }\n"
" if (i == 3) {\n"
" return c;\n"
" }\n"
" return 0.0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) The scope of the variable 'a' can be reduced.\n"
"[test.cpp:4]: (style) The scope of the variable 'b' can be reduced.\n"
"[test.cpp:5]: (style) The scope of the variable 'c' can be reduced.\n",
errout_str());
}

#define checkOldStylePointerCast(code) checkOldStylePointerCast_(code, __FILE__, __LINE__)
void checkOldStylePointerCast_(const char code[], const char* file, int line) {
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