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Fix #11767 (False positive: uninitialized member after assignment) (#5157)

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Daniel Marjamäki 2023-06-15 14:42:58 +02:00 committed by GitHub
parent d75331d00d
commit f934d6e5d0
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2 changed files with 22 additions and 2 deletions
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10
lib/astutils.cpp
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@ -2432,7 +2432,7 @@ bool isVariableChanged(const Token *tok, int indirect, const Settings *settings,
int derefs = 0;
while (Token::simpleMatch(tok2->astParent(), "*") ||
(Token::simpleMatch(tok2->astParent(), ".") && !Token::simpleMatch(tok2->astParent()->astParent(), "(")) ||
(tok2->astParent() && tok2->astParent()->isUnaryOp("&") && !tok2->astParent()->astOperand2() && Token::simpleMatch(tok2->astParent()->astParent(), ".") && tok2->astParent()->astParent()->originalName()=="->") ||
(tok2->astParent() && tok2->astParent()->isUnaryOp("&") && Token::simpleMatch(tok2->astParent()->astParent(), ".") && tok2->astParent()->astParent()->originalName()=="->") ||
(Token::simpleMatch(tok2->astParent(), "[") && tok2 == tok2->astParent()->astOperand1())) {
if (tok2->astParent() && (tok2->astParent()->isUnaryOp("*") || (astIsLHS(tok2) && tok2->astParent()->originalName() == "->")))
derefs++;
@ -2443,6 +2443,14 @@ bool isVariableChanged(const Token *tok, int indirect, const Settings *settings,
tok2 = tok2->astParent();
}
if (tok2->astParent() && tok2->astParent()->isUnaryOp("&")) {
const Token* parent = tok2->astParent();
while (parent->astParent() && parent->astParent()->isCast())
parent = parent->astParent();
if (parent->astParent() && parent->astParent()->isUnaryOp("*"))
tok2 = parent->astParent();
}
while ((Token::simpleMatch(tok2, ":") && Token::simpleMatch(tok2->astParent(), "?")) ||
(Token::simpleMatch(tok2->astParent(), ":") && Token::simpleMatch(tok2->astParent()->astParent(), "?")))
tok2 = tok2->astParent();

14
test/testvalueflow.cpp
View File

@ -5295,7 +5295,7 @@ private:
// initialization
code = "int foo() {\n"
" int x;\n"
" *((int *)(&x)) = 12;"
" *((int *)(&x)) = 12;\n"
" a = x + 1;\n"
"}";
values = tokenValues(code, "x +");
@ -5304,6 +5304,18 @@ private:
// ASSERT(values.front().isIntValue());
// ASSERT_EQUALS(12, values.front().intvalue);
code = "struct AB { int a; };\n" // 11767
"void fp(void) {\n"
" struct AB ab;\n"
" *((int*)(&(ab.a))) = 1;\n"
" x = ab.a + 1;\n" // <- not uninitialized
"}\n";
values = tokenValues(code, "ab . a +");
ASSERT_EQUALS(0, values.size());
// ASSERT_EQUALS(1U, values.size());
// ASSERT(values.front().isIntValue());
// ASSERT_EQUALS(1, values.front().intvalue);
// #8036
code = "void foo() {\n"
" int x;\n"