llvm-project.git/llvm/lib/XRay/Trace.cpp, branch users/nico/python-2

[XRay] Reserve memory space ahead-of-time when reading native format log (#76853)

2024-01-13T00:34:39+00:00

XRay used to struggle reading large log files. It turned out the
bottleneck was primarily caused by the reallocation happens when
appending log entries into a std::vector.
This patch reserves the memory space ahead-of-time since the number of
entries is known for most cases. Making llvm-xray runs 1.8 times faster
and uses 1.4 times less physical memory when reading large (~2.6GB) log
files.

[XRay] Remove XRayRecordStorage

2022-09-11T23:11:41+00:00

AFAICT, this type hasn't used for 4 years at least.

[llvm-xray] consumeError when trying big-endian

2020-05-17T05:44:48+00:00

Follow-up of rL341226.

Fixes "Expected must be checked before access or destruction"

Revert "Remove redundant "std::move"s in return statements"

2020-02-10T15:07:40+00:00

The build failed with

  error: call to deleted constructor of 'llvm::Error'

errors.

This reverts commit 1c2241a7936bf85aa68aef94bd40c3ba77d8ddf2.

Remove redundant "std::move"s in return statements

2020-02-10T14:39:44+00:00

Switch LLVM to use 64-bit offsets (2/5)

2019-08-06T10:49:40+00:00

This updates all libraries and tools in LLVM Core to use 64-bit offsets
which directly or indirectly come to DataExtractor.

Differential Revision: https://reviews.llvm.org/D65638

llvm-svn: 368014

Open native file handles to avoid converting from FDs, NFC

2019-07-11T20:29:32+00:00

Follow up to r365588.

llvm-svn: 365820

[Support] Move llvm::MemoryBuffer to sys::fs::file_t

2019-07-10T00:34:13+00:00

Summary:
On Windows, Posix integer file descriptors are a compatibility layer
over native file handles provided by the C runtime. There is a hard
limit on the maximum number of file descriptors that a process can open,
and the limit is 8192. LLD typically doesn't run into this limit because
it opens input files, maps them into memory, and then immediately closes
the file descriptor. This prevents it from running out of FDs.

For various reasons, I'd like to open handles to every input file and
keep them open during linking. That requires migrating MemoryBuffer over
to taking open native file handles instead of integer FDs.

Reviewers: aganea, Bigcheese

Reviewed By: aganea

Subscribers: smeenai, silvas, mehdi_amini, hiraditya, steven_wu, dexonsmith, dang, llvm-commits, zturner

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D63453

llvm-svn: 365588

Use llvm::stable_sort

2019-04-23T14:51:27+00:00

While touching the code, simplify if feasible.

llvm-svn: 358996

Update the file headers across all of the LLVM projects in the monorepo

2019-01-19T08:50:56+00:00

to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636