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author | Carlo Zancanaro <carlo@pc-4w14-0.cs.usyd.edu.au> | 2012-10-15 17:10:06 +1100 |
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committer | Carlo Zancanaro <carlo@pc-4w14-0.cs.usyd.edu.au> | 2012-10-15 17:10:06 +1100 |
commit | be1de4be954c80875ad4108e0a33e8e131b2f2c0 (patch) | |
tree | 1fbbecf276bf7c7bdcbb4dd446099d6d90eaa516 /clang/test/Analysis/unions-region.m | |
parent | c4626a62754862d20b41e8a46a3574264ea80e6d (diff) | |
parent | f1bd2e48c5324d3f7cda4090c87f8a5b6f463ce2 (diff) |
Merge branch 'master' of ssh://bitbucket.org/czan/honours
Diffstat (limited to 'clang/test/Analysis/unions-region.m')
-rw-r--r-- | clang/test/Analysis/unions-region.m | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/clang/test/Analysis/unions-region.m b/clang/test/Analysis/unions-region.m new file mode 100644 index 0000000..1a71684 --- /dev/null +++ b/clang/test/Analysis/unions-region.m @@ -0,0 +1,41 @@ +// RUN: %clang_cc1 -analyze -analyzer-checker=core -analyzer-store=region -analyzer-constraints=range %s -verify + +//===-- unions-region.m ---------------------------------------------------===// +// +// This file tests the analyzer's reasoning about unions. +// +//===----------------------------------------------------------------------===// + +// [testA] When using RegionStore, this test case previously had a +// false positive of a 'pass-by-value argument is uninitialized' +// warning at the call to 'testA_aux' and 'testA_aux_2'. +union u_testA { + unsigned i; + float f; +}; + +float testA(float f) { + int testA_aux(unsigned x); + int testA_aux_2(union u_testA z); + + union u_testA swap; + swap.f = f; + + if (testA_aux(swap.i)) // no-warning + swap.i = ((swap.i & 0xffff0000) >> 16) | ((swap.i & 0x0000fffff) << 16); + + testA_aux_2(swap); // no-warning + + return swap.f; +} + +// [testB] When using RegionStore, this test case previously had a +// false positive of a 'pass-by-value argument is uninitialized' +// warning at the call to 'testB_aux'. +void testB(int i) { + void testB_aux(short z); + union { short x[2]; unsigned y; } val; + val.y = 10; + testB_aux(val.x[1]); // no-warning +} + |