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| author | Duncan P. N. Exon Smith <dexonsmith@apple.com> | 2017-03-13 18:45:08 +0000 |
|---|---|---|
| committer | Duncan P. N. Exon Smith <dexonsmith@apple.com> | 2017-03-13 18:45:08 +0000 |
| commit | 60fa28882eda2a05576e94690a586940ba9ca43c (patch) | |
| tree | f96f8f1f6610cde2c0f267d531326ce362c47976 /llvm/test | |
| parent | 75a7e6589f643f6ed47d1fc04339696e7fb1e120 (diff) | |
| download | bcm5719-llvm-60fa28882eda2a05576e94690a586940ba9ca43c.tar.gz bcm5719-llvm-60fa28882eda2a05576e94690a586940ba9ca43c.zip | |
Modules: Use hash of PCM content for SIGNATURE
Change ASTFileSignature from a random 32-bit number to the hash of the
PCM content.
- Move definition ASTFileSignature to Basic/Module.h so Module and
ASTSourceDescriptor can use it.
- Change the signature from uint64_t to std::array<uint32_t,5>.
- Stop using (saving/reading) the size and modification time of PCM
files when there is a valid SIGNATURE.
- Add UNHASHED_CONTROL_BLOCK, and use it to store the SIGNATURE record
and other records that shouldn't affect the hash. Because implicit
modules reuses the same file for multiple levels of -Werror, this
includes DIAGNOSTIC_OPTIONS and DIAG_PRAGMA_MAPPINGS.
This helps to solve a PCH + implicit Modules dependency issue: PCH files
are handled by the external build system, whereas implicit modules are
handled by internal compiler build system. This prevents invalidating a
PCH when the compiler overwrites a PCM file with the same content
(modulo the diagnostic differences).
Design and original patch by Manman Ren!
llvm-svn: 297655
Diffstat (limited to 'llvm/test')
0 files changed, 0 insertions, 0 deletions
