llvm-project

History

Jaroslav Sevcik 4481eefbe8 [ASTImporter] Properly delete decls from SavedImportPaths Summary: We see a significant regression (~40% slower on large codebases) in expression evaluation after https://reviews.llvm.org/rL364771. A sampling profile shows the extra time is spent in SavedImportPathsTy::operator[] when called from ASTImporter::Import. I believe this is because ASTImporter::Import adds an element to the SavedImportPaths map for each decl unconditionally (see `7b81c3f879/clang/lib/AST/ASTImporter.cpp (L8256)`). To fix this, we call SavedImportPathsTy::erase on the declaration rather than clearing its value vector. That way we do not accidentally introduce new empty elements. (With this patch the performance is restored, and we do not see SavedImportPathsTy::operator[] in the profile anymore.) Reviewers: martong, teemperor, a.sidorin, shafik Reviewed By: martong Subscribers: rnkovacs, cfe-commits Tags: #clang Differential Revision: https://reviews.llvm.org/D73166		2020-01-22 15:20:06 +01:00
..
INPUTS	…
bindings	[Wdocumentation] Implement \anchor	2019-12-21 14:52:21 +01:00
cmake	[CMake] Use LinuxRemoteTI instead of LinuxLocalTI in CrossWinToARMLinux cmake cache	2020-01-18 01:29:09 +03:00
docs	Revert "PR17164: Change clang's default behavior from -flax-vector-conversions=all to -flax-vector-conversions=integer."	2020-01-20 16:34:09 -08:00
examples	Update clang-interpreter example to incorporate changes in `ce2207abaf`.	2020-01-21 22:00:50 -08:00
include	[Concepts] Placeholder constraints and abbreviated templates	2020-01-22 12:09:13 +02:00
lib	[ASTImporter] Properly delete decls from SavedImportPaths	2020-01-22 15:20:06 +01:00
runtime	…
test	Revert "[Concepts] Fix bug when referencing function parameters in instantiated function template requires clause"	2020-01-22 12:16:35 +02:00
tools	[Concepts] Requires Expressions	2020-01-19 00:23:26 +02:00
unittests	[clang][index] Index the injected class name types.	2020-01-22 10:07:54 +01:00
utils	[TableGen] Use a table to lookup MVE intrinsic names	2020-01-21 11:05:45 -08:00
www	CWG2352: Allow qualification conversions during reference binding.	2020-01-09 18:24:06 -08:00
.arcconfig	…
.clang-format	…
.clang-tidy	…
.gitignore	…
CMakeLists.txt	[Clang][Driver] Re-use the calling process instead of creating a new process for the cc1 invocation	2020-01-13 10:40:18 -05:00
CODE_OWNERS.TXT	…
INSTALL.txt	…
LICENSE.TXT	…
ModuleInfo.txt	…
NOTES.txt	…
README.txt	[NFC] test commit reverted	2019-12-21 22:12:07 +04:00

README.txt

//===----------------------------------------------------------------------===//
// C Language Family Front-end
//===----------------------------------------------------------------------===//

Welcome to Clang.  This is a compiler front-end for the C family of languages
(C, C++, Objective-C, and Objective-C++) which is built as part of the LLVM
compiler infrastructure project.

Unlike many other compiler frontends, Clang is useful for a number of things
beyond just compiling code: we intend for Clang to be host to a number of
different source-level tools.  One example of this is the Clang Static Analyzer.

If you're interested in more (including how to build Clang) it is best to read
the relevant web sites.  Here are some pointers:

Information on Clang:             http://clang.llvm.org/
Building and using Clang:         http://clang.llvm.org/get_started.html
Clang Static Analyzer:            http://clang-analyzer.llvm.org/
Information on the LLVM project:  http://llvm.org/

If you have questions or comments about Clang, a great place to discuss them is
on the Clang development mailing list:
  http://lists.llvm.org/mailman/listinfo/cfe-dev

If you find a bug in Clang, please file it in the LLVM bug tracker:
  http://llvm.org/bugs/