Eric Fiselier e7f8cd476d [libc++] Shrink variant's index type when possible ...

Summary:
Currently `std::variant` always uses an unsigned int to store the variant index. However this isn't nessesary and causes `std::variant` to be larger than it needs to be in most cases.

This patch changes the index type to be `unsigned char` when possible, and `unsigned short` or `unsigned int` otherwise, depending on the size (Although it's questionable if it's even possible to create a variant with 65535 elements.

Unfortunately this change is an ABI break, and as such is only enabled in ABI v2.

Reviewers: mpark

Reviewed By: mpark

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D40210

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@318621 91177308-0d34-0410-b5e6-96231b3b80d8

2017-11-19 04:19:44 +00:00

..

experimental

More of P0600 - '[[nodiscard]] in the Library' mark empty() as nodiscard in filesystem::path

2017-11-16 05:48:32 +00:00

ext

Remove usages of _LIBCPP_MSVC which is never defined

2017-05-10 21:40:58 +00:00

support

Redirect strftime_l to the locale-ignorant strftime on mingw

2017-09-06 05:07:25 +00:00

__bit_reference

[Libc++] Use #pragma push_macro/pop_macro to better handle min/max on Windows

2017-05-31 22:07:49 +00:00

__bsd_locale_defaults.h

Add system header pragma to BSD locale fallback headers.

2017-08-03 02:50:43 +00:00

__bsd_locale_fallbacks.h

Add system header pragma to BSD locale fallback headers.

2017-08-03 02:50:43 +00:00

__config

[libc++] Shrink variant's index type when possible

2017-11-19 04:19:44 +00:00

__config_site.in

[libc++] Support Microsoft ABI without vcruntime headers

2017-10-09 19:25:17 +00:00

__debug

[libc++] Introduce _LIBCPP_EXTERN_VIS to fix __libcpp_debug_function link errors

2017-01-16 21:01:00 +00:00

__functional_03

Add some const_casts in places where we were implicitly casting away constness. No functional change, but now they're explicit

2017-06-14 20:00:36 +00:00

__functional_base

Fix bug 33389 - __is_transparent check requires too much

2017-06-13 14:34:58 +00:00

__functional_base_03

[libcxx] Rewrite C++03 __invoke.

2015-08-26 20:15:02 +00:00

__hash_table

Fix some undefined behavior in __hash_table. Thanks to vsk for the report and the patch. Reviewed as https://reviews.llvm.org/D33588.

2017-06-03 00:08:32 +00:00

__libcpp_version

Update _LIBCPP_VERSION and the version in CMakeLists to 6.0

2017-07-19 13:57:10 +00:00

__locale

Fix libcxx build with glibc 2.26+ by removing xlocale.h include.

2017-08-03 04:28:10 +00:00

__mutex_base

Fix compile error with Bionic's PTHREAD_MUTEX_INITIALIZER

2017-06-07 20:47:42 +00:00

__nullptr

[NFC] Rename _LIBCPP_TYPE_VIS_ONLY to _LIBCPP_TEMPLATE_VIS

2017-01-04 23:56:00 +00:00

__split_buffer

[Libc++] Use #pragma push_macro/pop_macro to better handle min/max on Windows

2017-05-31 22:07:49 +00:00

__sso_allocator

[libc++] Tolerate presence of __deallocate macro

2017-01-07 03:01:24 +00:00

__std_stream

[Libc++] Use #pragma push_macro/pop_macro to better handle min/max on Windows

2017-05-31 22:07:49 +00:00

__string

[Libc++] Use #pragma push_macro/pop_macro to better handle min/max on Windows

2017-05-31 22:07:49 +00:00

__threading_support

[Libc++] Use #pragma push_macro/pop_macro to better handle min/max on Windows

2017-05-31 22:07:49 +00:00

__tree

Spelling

2017-08-18 12:57:36 +00:00

__tuple

Cleanup remaining usages of _LIBCPP_HAS_NO_<c++11-feature> in tuple and utility

2017-04-19 01:23:39 +00:00

__undef_macros

[Libc++] Use #pragma push_macro/pop_macro to better handle min/max on Windows

2017-05-31 22:07:49 +00:00

algorithm

Rename identifiers named __output

2017-11-14 11:14:25 +00:00

any

Implement part of LWG#2857 - any/optional. Still to do - variant. Reviewed as https://reviews.llvm.org/D31956

2017-04-12 22:51:27 +00:00

array

First part of P0600 - '[[nodiscard] in the standard library'. Mark the 'empty()' methods of all the containers as nodiscard. If you're calling empty() w/o looking at the result, you probably meanto to call 'clear()'. c++2a only

2017-11-15 05:51:26 +00:00

atomic

Fix ATOMIC_<TYPE>_LOCK_FREE macros on Windows.

2017-04-20 23:22:46 +00:00

bitset

[Libc++] Use #pragma push_macro/pop_macro to better handle min/max on Windows

2017-05-31 22:07:49 +00:00

cassert

Windows support by Ruben Van Boxem.

2011-10-17 20:05:10 +00:00

ccomplex

Windows support by Ruben Van Boxem.

2011-10-17 20:05:10 +00:00

cctype

Put back the undefs that Richard removed. Boost won't build w/o these; specifically the file 'bytes_methods.h' in Apple's python framework defines these.

2016-04-04 22:49:20 +00:00

cerrno

Split <errno.h> out of <cerrno>.

2015-10-08 20:37:11 +00:00

cfenv

Fix incorrect file header. This is <cfenv> not <cctype>.

2015-10-08 21:17:21 +00:00

cfloat

Split <float.h> out of <cfloat>.

2015-10-08 20:37:44 +00:00

chrono

Change the way the literal operators are defined - now w/o a seperating space. This should be a NFC, but it will change how the compiler parses it.

2017-08-09 15:42:50 +00:00

cinttypes

Split <inttypes.h> out of <cinttypes>.

2015-10-08 20:38:53 +00:00

ciso646

Windows support by Ruben Van Boxem.

2011-10-17 20:05:10 +00:00

climits

Windows support by Ruben Van Boxem.

2011-10-17 20:05:10 +00:00

clocale

Make support for thread-unsafe C functions optional.

2015-06-24 08:44:38 +00:00

CMakeLists.txt

[libcxx][CMake] Add install path variable to allow overriding the destination

2017-07-11 02:39:50 +00:00

cmath

cmath: Support clang's -fdelayed-template-parsing

2017-07-07 05:13:36 +00:00

codecvt

[NFC] Rename _LIBCPP_TYPE_VIS_ONLY to _LIBCPP_TEMPLATE_VIS

2017-01-04 23:56:00 +00:00

complex

cmath: Support clang's -fdelayed-template-parsing

2017-07-07 05:13:36 +00:00

complex.h

PR25118: move system_header pragma before uses of include_next to avoid extension warnings for people finding libc++ headers via -I paths.

2015-10-09 00:26:50 +00:00

condition_variable

[libc++] Make _LIBCPP_TYPE_VIS export members

2017-03-02 03:22:18 +00:00

csetjmp

Split <setjmp.h> out of <csetjmp>.

2015-10-08 20:41:26 +00:00

csignal

Windows support by Ruben Van Boxem.

2011-10-17 20:05:10 +00:00

cstdarg

Windows support by Ruben Van Boxem.

2011-10-17 20:05:10 +00:00

cstdbool

Windows support by Ruben Van Boxem.

2011-10-17 20:05:10 +00:00

cstddef

Implement LWG2950: std::byte operations are misspecified

2017-11-14 01:14:53 +00:00

cstdint

Windows support by Ruben Van Boxem.

2011-10-17 20:05:10 +00:00

cstdio

[libc++] Drop support for CRTs older than VS 2015

2017-04-07 02:20:52 +00:00

cstdlib

[libc++] Respect Windows Store app CRT restrictions

2017-04-06 04:47:49 +00:00

cstring

Fix overload sets of strchr, strpbrk, strrchr, memchr and strstr from

2016-02-10 00:59:02 +00:00

ctgmath

Windows support by Ruben Van Boxem.

2011-10-17 20:05:10 +00:00

ctime

Make support for thread-unsafe C functions optional.

2015-06-24 08:44:38 +00:00

ctype.h

[libc++] Refactor Windows support headers.

2017-05-10 20:57:45 +00:00

cwchar

[libc++] Remove unnecessary MSVCRT exclusions

2016-11-08 03:31:42 +00:00

cwctype

Split <wctype.h> out of <cwctype>.

2015-10-09 19:57:37 +00:00

deque

First part of P0600 - '[[nodiscard] in the standard library'. Mark the 'empty()' methods of all the containers as nodiscard. If you're calling empty() w/o looking at the result, you probably meanto to call 'clear()'. c++2a only

2017-11-15 05:51:26 +00:00

errno.h

Cleanup foo.h headers and __config to work in C

2015-11-06 06:30:12 +00:00

exception

[libc++] Support Microsoft ABI without vcruntime headers

2017-10-09 19:25:17 +00:00

float.h

Cleanup foo.h headers and __config to work in C

2015-11-06 06:30:12 +00:00

forward_list

First part of P0600 - '[[nodiscard] in the standard library'. Mark the 'empty()' methods of all the containers as nodiscard. If you're calling empty() w/o looking at the result, you probably meanto to call 'clear()'. c++2a only

2017-11-15 05:51:26 +00:00

fstream

Make pbump (internally) handle sizes bigger than MAX_INT. Fixes PR#33725 - thanks to Jonathan Wakely for the report

2017-09-12 15:00:43 +00:00

functional

Fix PR34298 - Allow std::function with an incomplete return type.

2017-09-10 23:41:20 +00:00

future

Add markup for libc++ dylib availability

2017-05-04 17:08:54 +00:00

initializer_list

Cleanup _LIBCPP_HAS_NO_<c++11-feature> macros for std::initializer_list

2017-04-18 23:09:36 +00:00

inttypes.h

[include] Declare __STDC_*_MACROS for C++11 compat in old libc

2016-09-26 20:20:00 +00:00

iomanip

Move 'quoted' for string_view from <string_view> to <iomanip> (where the other versions of 'quoted' live. No functional change.

2016-10-27 15:10:07 +00:00

ios

Cleanup usages of _LIBCPP_HAS_NO_<c++11-feature> in <bitset>, <ios>, <locale>, and <iterator>

2017-04-19 01:34:08 +00:00

iosfwd

[NFC] Rename _LIBCPP_TYPE_VIS_ONLY to _LIBCPP_TEMPLATE_VIS

2017-01-04 23:56:00 +00:00

iostream

Make the presence of stdin and stdout optional.

2015-03-26 14:35:46 +00:00

istream

[Libc++] Use #pragma push_macro/pop_macro to better handle min/max on Windows

2017-05-31 22:07:49 +00:00

iterator

Mark free functions size/empty/data conditionally noexcept.

2017-11-16 17:55:41 +00:00

limits

Fix more unreserved names

2017-06-01 02:29:37 +00:00

limits.h

[libcxx] Fix gcc build.

2016-10-10 15:56:01 +00:00

list

First part of P0600 - '[[nodiscard] in the standard library'. Mark the 'empty()' methods of all the containers as nodiscard. If you're calling empty() w/o looking at the result, you probably meanto to call 'clear()'. c++2a only

2017-11-15 05:51:26 +00:00

locale

Make pbump (internally) handle sizes bigger than MAX_INT. Fixes PR#33725 - thanks to Jonathan Wakely for the report

2017-09-12 15:00:43 +00:00

locale.h

[libcxx] Implement locale.h to fix modules build

2016-11-19 01:14:15 +00:00

map

First part of P0600 - '[[nodiscard] in the standard library'. Mark the 'empty()' methods of all the containers as nodiscard. If you're calling empty() w/o looking at the result, you probably meanto to call 'clear()'. c++2a only

2017-11-15 05:51:26 +00:00

math.h

cmath: Skip Libc for integral types in isinf, etc.

2017-04-21 23:14:55 +00:00

memory

Add _LIBCPP_INLINE_VISIBILITY to __compressed_pair_elem members

2017-11-09 17:54:49 +00:00

module.modulemap

[Libc++] Use #pragma push_macro/pop_macro to better handle min/max on Windows

2017-05-31 22:07:49 +00:00

mutex

Implement P0739R0: 'Some improvements to class template argument deduction integration into the standard library' This is an API change (not ABI change) due to a late change in the c++17 standard

2017-07-27 17:44:03 +00:00

new

[libc++] Support Microsoft ABI without vcruntime headers

2017-10-09 19:25:17 +00:00

numeric

Implement inclusive_scan/transform_inclusive_scan for C++17.

2017-06-23 05:12:42 +00:00

optional

Update the synopsis to match the P/R of 2945. No code changes.

2017-11-01 01:27:25 +00:00

ostream

Add markup for libc++ dylib availability

2017-05-04 17:08:54 +00:00

queue

First part of P0600 - '[[nodiscard] in the standard library'. Mark the 'empty()' methods of all the containers as nodiscard. If you're calling empty() w/o looking at the result, you probably meanto to call 'clear()'. c++2a only

2017-11-15 05:51:26 +00:00

random

Revert 313789 because gcc doesn't like it

2017-09-20 19:38:43 +00:00

ratio

[Libc++] Use #pragma push_macro/pop_macro to better handle min/max on Windows

2017-05-31 22:07:49 +00:00

regex

More of P0600 - '[[nodiscard]] in the Library' mark empty() as nodiscard in match_results. <regex>

2017-11-16 04:48:34 +00:00

scoped_allocator

[NFC] Rename _LIBCPP_TYPE_VIS_ONLY to _LIBCPP_TEMPLATE_VIS

2017-01-04 23:56:00 +00:00

set

First part of P0600 - '[[nodiscard] in the standard library'. Mark the 'empty()' methods of all the containers as nodiscard. If you're calling empty() w/o looking at the result, you probably meanto to call 'clear()'. c++2a only

2017-11-15 05:51:26 +00:00

setjmp.h

Cleanup foo.h headers and __config to work in C

2015-11-06 06:30:12 +00:00

shared_mutex

[Libc++] Use #pragma push_macro/pop_macro to better handle min/max on Windows

2017-05-31 22:07:49 +00:00

sstream

Make pbump (internally) handle sizes bigger than MAX_INT. Fixes PR#33725 - thanks to Jonathan Wakely for the report

2017-09-12 15:00:43 +00:00

stack

First part of P0600 - '[[nodiscard] in the standard library'. Mark the 'empty()' methods of all the containers as nodiscard. If you're calling empty() w/o looking at the result, you probably meanto to call 'clear()'. c++2a only

2017-11-15 05:51:26 +00:00

stdbool.h

Add stdbool.h wrapper for libc++

2016-02-20 00:16:41 +00:00

stddef.h

Check for musl-libc's max_align_t in addition to other variants.

2017-02-10 01:27:42 +00:00

stdexcept

Fix more unreserved names

2017-06-01 02:29:37 +00:00

stdint.h

[include] Declare __STDC_*_MACROS for C++11 compat in old libc

2016-09-26 20:20:00 +00:00

stdio.h

Fix Libc++ build with MinGW64

2017-05-31 22:14:05 +00:00

stdlib.h

[libc++] Refactor Windows support headers.

2017-05-10 20:57:45 +00:00

streambuf

Make pbump (internally) handle sizes bigger than MAX_INT. Fixes PR#33725 - thanks to Jonathan Wakely for the report

2017-09-12 15:00:43 +00:00

string

More of P0600 - '[[nodiscard]] in the Library' mark empty() as nodiscard in string, string_view, and the free function std::empty(). Removed tabs from <string_view>, which is why the diff is so big.

2017-11-15 20:02:27 +00:00

string_view

More of P0600 - '[[nodiscard]] in the Library' mark empty() as nodiscard in string, string_view, and the free function std::empty(). Removed tabs from <string_view>, which is why the diff is so big.

2017-11-15 20:02:27 +00:00

string.h

Instead of asking glibc to provide correct C++ signatures for <string.h>

2016-02-11 23:51:02 +00:00

strstream

Cleanup _LIBCPP_HAS_NO_<c++11-feature> in the input.output library

2017-04-18 23:38:41 +00:00

system_error

Add include of <string> to <system_error>, since things in there return strings. Fixes PR#34529.

2017-09-11 16:05:42 +00:00

tgmath.h

Windows support by Ruben Van Boxem.

2011-10-17 20:05:10 +00:00

thread

[Libc++] Use #pragma push_macro/pop_macro to better handle min/max on Windows

2017-05-31 22:07:49 +00:00

tuple

Add C++17 explicit deduction guides to std::pair.

2017-10-04 00:04:26 +00:00

type_traits

Implement LWG2950: std::byte operations are misspecified

2017-11-14 01:14:53 +00:00

typeindex

[NFC] Rename _LIBCPP_TYPE_VIS_ONLY to _LIBCPP_TEMPLATE_VIS

2017-01-04 23:56:00 +00:00

typeinfo

[libc++] Remove unnecessary struct tag

2017-09-15 06:19:31 +00:00

unordered_map

First part of P0600 - '[[nodiscard] in the standard library'. Mark the 'empty()' methods of all the containers as nodiscard. If you're calling empty() w/o looking at the result, you probably meanto to call 'clear()'. c++2a only

2017-11-15 05:51:26 +00:00

unordered_set

First part of P0600 - '[[nodiscard] in the standard library'. Mark the 'empty()' methods of all the containers as nodiscard. If you're calling empty() w/o looking at the result, you probably meanto to call 'clear()'. c++2a only

2017-11-15 05:51:26 +00:00

utility

Add C++17 explicit deduction guides to std::pair.

2017-10-04 00:04:26 +00:00

valarray

[Libc++] Use #pragma push_macro/pop_macro to better handle min/max on Windows

2017-05-31 22:07:49 +00:00

variant

[libc++] Shrink variant's index type when possible

2017-11-19 04:19:44 +00:00

vector

First part of P0600 - '[[nodiscard] in the standard library'. Mark the 'empty()' methods of all the containers as nodiscard. If you're calling empty() w/o looking at the result, you probably meanto to call 'clear()'. c++2a only

2017-11-15 05:51:26 +00:00

wchar.h

[libc++] Account for Microsoft CRT const overloads

2017-09-15 18:49:34 +00:00

wctype.h

Split <wctype.h> out of <cwctype>.

2015-10-09 19:57:37 +00:00