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ValueFlow: Set values to parameters to longjmp and setjmp (#4040) 

* ValueFlow: Set values to parameters to longjmp and setjmp

* Format
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Paul Fultz II 2022-04-22 23:18:55 -05:00 committed by GitHub
parent 4fa2e3ac87
commit 4eed29502c
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2 changed files with 12 additions and 2 deletions
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8
lib/forwardanalyzer.cpp
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@ -123,9 +123,13 @@ struct ForwardTraversal {
template<class T, class F, REQUIRES("T must be a Token class", std::is_convertible<T*, const Token*> )> template<class T, class F, REQUIRES("T must be a Token class", std::is_convertible<T*, const Token*> )>
Progress traverseTok(T* tok, F f, bool traverseUnknown, T** out = nullptr) { Progress traverseTok(T* tok, F f, bool traverseUnknown, T** out = nullptr) {
if (Token::Match(tok, "asm|goto|setjmp|longjmp")) if (Token::Match(tok, "asm|goto"))
return Break(Analyzer::Terminate::Bail); return Break(Analyzer::Terminate::Bail);
else if (Token::simpleMatch(tok, "continue")) { else if (Token::Match(tok, "setjmp|longjmp (")) {
// Traverse the parameters of the function before escaping
traverseRecursive(tok->next()->astOperand2(), f, traverseUnknown);
return Break(Analyzer::Terminate::Bail);
} else if (Token::simpleMatch(tok, "continue")) {
if (loopEnds.empty()) if (loopEnds.empty())
return Break(Analyzer::Terminate::Escape); return Break(Analyzer::Terminate::Escape);
// If we are in a loop then jump to the end // If we are in a loop then jump to the end

6
test/testvalueflow.cpp
View File

@ -3486,6 +3486,12 @@ private:
" exit(x);\n" " exit(x);\n"
"}\n"; "}\n";
ASSERT_EQUALS(true, testValueOfXKnown(code, 3U, 1)); ASSERT_EQUALS(true, testValueOfXKnown(code, 3U, 1));
code = "void f(jmp_buf env) {\n"
" int x = 1;\n"
" longjmp(env, x);\n"
"}\n";
ASSERT_EQUALS(true, testValueOfXKnown(code, 3U, 1));
} }
void valueFlowForwardTernary() { void valueFlowForwardTernary() {