-Wuninitialized bugfix: when entering the scope of a variable with no
initializer, it is uninitialized, even if we may be coming from somewhere where it was initialized. llvm-svn: 158611
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@ -625,6 +625,18 @@ void TransferFunctions::VisitDeclStmt(DeclStmt *ds) {
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// the use of the uninitialized value (which visiting the
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// initializer).
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vals[vd] = Initialized;
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} else {
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// No initializer: the variable is now uninitialized. This matters
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// for cases like:
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// while (...) {
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// int n;
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// use(n);
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// n = 0;
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// }
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// FIXME: Mark the variable as uninitialized whenever its scope is
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// left, since its scope could be re-entered by a jump over the
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// declaration.
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vals[vd] = Uninitialized;
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}
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}
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}
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@ -437,3 +437,28 @@ void test54() {
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int c; // expected-note {{initialize the variable 'c' to silence this warning}}
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ASSIGN(int, c, d); // expected-warning {{variable 'c' is uninitialized when used here}}
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}
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void uninit_in_loop() {
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int produce(void);
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void consume(int);
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for (int n = 0; n < 100; ++n) {
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int k; // expected-note {{initialize}}
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consume(k); // expected-warning {{variable 'k' is uninitialized}}
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k = produce();
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}
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}
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void uninit_in_loop_goto() {
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int produce(void);
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void consume(int);
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for (int n = 0; n < 100; ++n) {
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goto skip_decl;
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int k; // expected-note {{initialize}}
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skip_decl:
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// FIXME: This should produce the 'is uninitialized' diagnostic, but we
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// don't have enough information in the CFG to easily tell that the
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// variable's scope has been left and re-entered.
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consume(k); // expected-warning {{variable 'k' may be uninitialized}}
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k = produce();
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}
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}
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