[cfe-commits] r158611 - in /cfe/trunk: lib/Analysis/UninitializedValues.cpp test/Sema/uninit-variables.c
Richard Smith
richard-llvm at metafoo.co.uk
Sat Jun 16 16:34:14 PDT 2012
Author: rsmith
Date: Sat Jun 16 18:34:14 2012
New Revision: 158611
URL: http://llvm.org/viewvc/llvm-project?rev=158611&view=rev
Log:
-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.
Modified:
cfe/trunk/lib/Analysis/UninitializedValues.cpp
cfe/trunk/test/Sema/uninit-variables.c
Modified: cfe/trunk/lib/Analysis/UninitializedValues.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Analysis/UninitializedValues.cpp?rev=158611&r1=158610&r2=158611&view=diff
==============================================================================
--- cfe/trunk/lib/Analysis/UninitializedValues.cpp (original)
+++ cfe/trunk/lib/Analysis/UninitializedValues.cpp Sat Jun 16 18:34:14 2012
@@ -625,6 +625,18 @@
// the use of the uninitialized value (which visiting the
// initializer).
vals[vd] = Initialized;
+ } else {
+ // No initializer: the variable is now uninitialized. This matters
+ // for cases like:
+ // while (...) {
+ // int n;
+ // use(n);
+ // n = 0;
+ // }
+ // FIXME: Mark the variable as uninitialized whenever its scope is
+ // left, since its scope could be re-entered by a jump over the
+ // declaration.
+ vals[vd] = Uninitialized;
}
}
}
Modified: cfe/trunk/test/Sema/uninit-variables.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Sema/uninit-variables.c?rev=158611&r1=158610&r2=158611&view=diff
==============================================================================
--- cfe/trunk/test/Sema/uninit-variables.c (original)
+++ cfe/trunk/test/Sema/uninit-variables.c Sat Jun 16 18:34:14 2012
@@ -437,3 +437,28 @@
int c; // expected-note {{initialize the variable 'c' to silence this warning}}
ASSIGN(int, c, d); // expected-warning {{variable 'c' is uninitialized when used here}}
}
+
+void uninit_in_loop() {
+ int produce(void);
+ void consume(int);
+ for (int n = 0; n < 100; ++n) {
+ int k; // expected-note {{initialize}}
+ consume(k); // expected-warning {{variable 'k' is uninitialized}}
+ k = produce();
+ }
+}
+
+void uninit_in_loop_goto() {
+ int produce(void);
+ void consume(int);
+ for (int n = 0; n < 100; ++n) {
+ goto skip_decl;
+ int k; // expected-note {{initialize}}
+skip_decl:
+ // FIXME: This should produce the 'is uninitialized' diagnostic, but we
+ // don't have enough information in the CFG to easily tell that the
+ // variable's scope has been left and re-entered.
+ consume(k); // expected-warning {{variable 'k' may be uninitialized}}
+ k = produce();
+ }
+}
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