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| author | Duncan P. N. Exon Smith <dexonsmith@apple.com> | 2021-01-26 16:01:36 -0800 |
|---|---|---|
| committer | Duncan P. N. Exon Smith <dexonsmith@apple.com> | 2021-04-08 16:26:35 -0700 |
| commit | 429088b9e214b2f39f6063a6b3639560fc7db47b (patch) | |
| tree | be73669c2b9eb26017bf129158980fa1c8bbac3f /llvm/lib/Support/Signposts.cpp | |
| parent | 38b106f6815716db4757a813d28ba4649d083c14 (diff) | |
| download | llvm-429088b9e214b2f39f6063a6b3639560fc7db47b.zip llvm-429088b9e214b2f39f6063a6b3639560fc7db47b.tar.gz llvm-429088b9e214b2f39f6063a6b3639560fc7db47b.tar.bz2 | |
Support: Extract fs::resize_file_before_mapping_readwrite from FileOutputBuffer
Add a variant of `fs::resize_file` for use immediately before opening a
file with `mapped_file_region::readwrite`. On Windows, `_chsize`
(`ftruncate`) is slow, but `CreateFileMapping` (`mmap`) automatically
extends the file so the call to `fs::resize_file` can be skipped.
This optimization was added to `FileOutputBuffer` in
da9bc2e56d5a5c6332a9def1a0065eb399182b93; this commit just extracts the
logic out and adds a unit test.
Differential Revision: https://reviews.llvm.org/D95490
Diffstat (limited to 'llvm/lib/Support/Signposts.cpp')
0 files changed, 0 insertions, 0 deletions