llvm-project/clang
Yonghong Song c15aa241f8 [CLANG][BPF] change __builtin_preserve_access_index() signature
The clang intrinsic __builtin_preserve_access_index() currently
has signature:
  const void * __builtin_preserve_access_index(const void * ptr)

This may cause compiler warning when:
  - parameter type is "volatile void *" or "const volatile void *", or
  - the assign-to type of the intrinsic does not have "const" qualifier.
Further, this signature does not allow dereference of the
builtin result pointer as it is a "const void *" type, which
adds extra step for the user to do type casting.

Let us change the signature to:
  PointerT __builtin_preserve_access_index(PointerT ptr)
such that the result and argument types are the same.
With this, directly dereferencing the builtin return value
becomes possible.

Differential Revision: https://reviews.llvm.org/D67734

llvm-svn: 372294
2019-09-19 02:59:43 +00:00
..
INPUTS
bindings [clang][Tooling] Infer target and mode from argv[0] when using JSONCompilationDatabase 2019-06-26 07:39:03 +00:00
cmake [CMake][Fuchsia] Enable experimental pass manager by default 2019-08-29 23:12:06 +00:00
docs [CLANG][BPF] change __builtin_preserve_access_index() signature 2019-09-19 02:59:43 +00:00
examples Fixup build of clang-interpreter example after change in r370122. 2019-08-28 02:13:24 +00:00
include [CLANG][BPF] change __builtin_preserve_access_index() signature 2019-09-19 02:59:43 +00:00
lib [CLANG][BPF] change __builtin_preserve_access_index() signature 2019-09-19 02:59:43 +00:00
runtime [GWP-ASan] Mutex implementation [2]. 2019-05-30 19:45:32 +00:00
test [CLANG][BPF] change __builtin_preserve_access_index() signature 2019-09-19 02:59:43 +00:00
tools [Timers] Fix printing some `-ftime-report` sections twice. Fixes PR40328. 2019-09-18 00:05:45 +00:00
unittests [clang-format][PR41899] PointerAlignment: Left leads to useless space in lambda intializer expression 2019-09-18 19:11:40 +00:00
utils Add SpellingNotCalculated to Attribute Enums to suppress UBSan warnings 2019-09-17 14:11:51 +00:00
www [c++20] P1331R2: Allow transient use of uninitialized objects in 2019-09-18 17:37:44 +00:00
.arcconfig
.clang-format
.clang-tidy
.gitignore
CMakeLists.txt [CMake] Don't set Python_ADDITIONAL_VERSIONS 2019-07-18 15:17:42 +00:00
CODE_OWNERS.TXT
INSTALL.txt
LICENSE.TXT
ModuleInfo.txt
NOTES.txt
README.txt [NFC] Test commit 2019-06-12 07:50:48 +00:00

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/