diff options
| author | Hans Wennborg <hans@hanshq.net> | 2017-07-26 16:35:53 +0000 |
|---|---|---|
| committer | Hans Wennborg <hans@hanshq.net> | 2017-07-26 16:35:53 +0000 |
| commit | 7a0666d0f312ee33dba0935018e7b758b89d202c (patch) | |
| tree | a2356834a765655df4ad2f5290c6400ab8b59f69 /lib/CodeGen | |
| parent | 3378e4c41b473dcb573f8d7c99fc15eb8e855428 (diff) | |
Merging r309058:
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r309058 | majnemer | 2017-07-25 16:33:58 -0700 (Tue, 25 Jul 2017) | 9 lines
[CodeGen] Correctly model std::byte's aliasing properties
std::byte, when defined as an enum, needs to be given special treatment
with regards to its aliasing properties. An array of std::byte is
allowed to be used as storage for other types.
This fixes PR33916.
Differential Revision: https://reviews.llvm.org/D35824
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_50@309135 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/CodeGenTBAA.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/CodeGen/CodeGenTBAA.cpp b/lib/CodeGen/CodeGenTBAA.cpp index 04224e7267..8a75a552d9 100644 --- a/lib/CodeGen/CodeGenTBAA.cpp +++ b/lib/CodeGen/CodeGenTBAA.cpp @@ -139,6 +139,12 @@ CodeGenTBAA::getTBAAInfo(QualType QTy) { } } + // C++1z [basic.lval]p10: "If a program attempts to access the stored value of + // an object through a glvalue of other than one of the following types the + // behavior is undefined: [...] a char, unsigned char, or std::byte type." + if (Ty->isStdByteType()) + return MetadataCache[Ty] = getChar(); + // Handle pointers. // TODO: Implement C++'s type "similarity" and consider dis-"similar" // pointers distinct. |