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| author | Richard Biener <rguenther@suse.de> | 2017-12-08 14:45:30 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2017-12-08 14:45:30 +0000 |
| commit | 68e6d5a6bdd07248e78eccbd19eb282a9531fd7c (patch) | |
| tree | cab7b6a3f4bab57135917c736bfa2bee10fc9c26 | |
| parent | 4f29e04064c39dfdc23831e41328f5ba84195957 (diff) | |
| download | gcc-68e6d5a6bdd07248e78eccbd19eb282a9531fd7c.zip gcc-68e6d5a6bdd07248e78eccbd19eb282a9531fd7c.tar.gz gcc-68e6d5a6bdd07248e78eccbd19eb282a9531fd7c.tar.bz2 | |
re PR middle-end/81782 (Yet another -Wmaybe-uninitialized false positive with empty array)
2017-12-08 Richard Biener <rguenther@suse.de>
PR middle-end/81782
* tree-ssa-uninit.c (warn_uninitialized_vars): Properly
handle accesses outside of zero-sized vars.
* gcc.dg/uninit-pr81782.c: New testcase.
From-SVN: r255512
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/uninit-pr81782.c | 14 | ||||
| -rw-r--r-- | gcc/tree-ssa-uninit.c | 4 |
4 files changed, 27 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 8184c66..bf4dc00 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2017-12-08 Richard Biener <rguenther@suse.de> + + PR middle-end/81782 + * tree-ssa-uninit.c (warn_uninitialized_vars): Properly + handle accesses outside of zero-sized vars. + 2017-12-08 Martin Jambor <mjambor@suse.cz> PR tree-optimization/83141 diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index d9ce35f..6a68ea6 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2017-12-08 Richard Biener <rguenther@suse.de> + + PR middle-end/81782 + * gcc.dg/uninit-pr81782.c: New testcase. + 2017-12-08 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE> * g++.dg/opt/pr83252.C: Add -mclear-hwcap on *-*-solaris*. diff --git a/gcc/testsuite/gcc.dg/uninit-pr81782.c b/gcc/testsuite/gcc.dg/uninit-pr81782.c new file mode 100644 index 0000000..7d1e902 --- /dev/null +++ b/gcc/testsuite/gcc.dg/uninit-pr81782.c @@ -0,0 +1,14 @@ +/* { dg-do compile } */ +/* { dg-options "-Wmaybe-uninitialized" } */ + +int +foo (void) +{ + char empty_array[] = { }; + int i, ret = 0; + + for (i = 0; i < (int) (sizeof (empty_array) / sizeof (empty_array[0])); i++) + ret = empty_array[i]; /* { dg-bogus "uninitialized" } */ + + return ret; +} diff --git a/gcc/tree-ssa-uninit.c b/gcc/tree-ssa-uninit.c index 4096ded..b17b2b1 100644 --- a/gcc/tree-ssa-uninit.c +++ b/gcc/tree-ssa-uninit.c @@ -296,8 +296,8 @@ warn_uninitialized_vars (bool warn_possibly_uninitialized) variable. */ if (DECL_P (base) && ref.size != -1 - && ref.max_size == ref.size - && (ref.offset + ref.size <= 0 + && ((ref.max_size == ref.size + && ref.offset + ref.size <= 0) || (ref.offset >= 0 && DECL_SIZE (base) && TREE_CODE (DECL_SIZE (base)) == INTEGER_CST |