Vendor import of clang 6.0.0 release r326565:
https://llvm.org/svn/llvm-project/cfe/tags/RELEASE_600/final@326565
This commit is contained in:
Dimitry Andric
parent
93179bb90b
commit
5c8694c6ce
@ -36,23 +36,23 @@ used to process multiple arguments from a single invocation from a SIMD loop
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concurrently.
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The syntax of the `declare simd` construct is as follows:
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.. code-block:: c
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.. code-block:: none
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#pragma omp declare simd [clause[[,] clause] ...] new-line
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[#pragma omp declare simd [clause[[,] clause] ...] new-line]
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[...]
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function definition or declaration
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#pragma omp declare simd [clause[[,] clause] ...] new-line
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[#pragma omp declare simd [clause[[,] clause] ...] new-line]
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[...]
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function definition or declaration
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where clause is one of the following:
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.. code-block:: c
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.. code-block:: none
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simdlen(length)
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linear(argument-list[:constant-linear-step])
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aligned(argument-list[:alignment])
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uniform(argument-list)
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inbranch
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notinbranch
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simdlen(length)
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linear(argument-list[:constant-linear-step])
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aligned(argument-list[:alignment])
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uniform(argument-list)
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inbranch
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notinbranch
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#pragma omp declare target
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@ -69,9 +69,9 @@ The syntax of the declare target directive is as follows:
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.. code-block:: c
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#pragma omp declare target new-line
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declarations-definition-seq
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#pragma omp end declare target new-line
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#pragma omp declare target new-line
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declarations-definition-seq
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#pragma omp end declare target new-line
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_Noreturn
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@ -557,7 +557,7 @@ available in C.
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int isdigit(int c);
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int isdigit(int c) __attribute__((enable_if(c <= -1 || c > 255, "chosen when 'c' is out of range"))) __attribute__((unavailable("'c' must have the value of an unsigned char or EOF")));
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void foo(char c) {
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isdigit(c);
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isdigit(10);
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@ -610,7 +610,7 @@ overload out of a number of viable overloads using enable_if.
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void f() __attribute__((enable_if(true, ""))); // #1
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void f() __attribute__((enable_if(true, ""))) __attribute__((enable_if(true, ""))); // #2
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void g(int i, int j) __attribute__((enable_if(i, ""))); // #1
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void g(int i, int j) __attribute__((enable_if(j, ""))) __attribute__((enable_if(true))); // #2
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@ -1170,7 +1170,7 @@ potentially-evaluated discarded-value expression that is not explicitly cast to
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.. code-block: c++
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struct [[nodiscard]] error_info { /*...*/ };
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error_info enable_missile_safety_mode();
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void launch_missiles();
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void test_missiles() {
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enable_missile_safety_mode(); // diagnoses
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@ -1451,7 +1451,7 @@ default name.
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can only be placed before an @protocol or @interface declaration:
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.. code-block:: objc
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__attribute__((objc_runtime_name("MyLocalName")))
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@interface Message
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@end
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@ -32,13 +32,34 @@ here. Generic improvements to Clang as a whole or to its underlying
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infrastructure are described first, followed by language-specific
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sections with improvements to Clang's support for those languages.
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Major New Features
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------------------
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Non-comprehensive list of changes in this release
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-------------------------------------------------
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- Support for `retpolines <https://support.google.com/faqs/answer/7625886>`_
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was added to help mitigate "branch target injection" (variant #2) of the
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"Spectre" speculative side channels described by `Project Zero
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<https://googleprojectzero.blogspot.com/2018/01/reading-privileged-memory-with-side.html>`_
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and the `Spectre paper <https://spectreattack.com/spectre.pdf>`_.
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- Bitrig OS was merged back into OpenBSD, so Bitrig support has been
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removed from Clang/LLVM.
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- The default value of ``_MSC_VER`` was raised from 1800 to 1911, making it
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compatible with the Visual Studio 2015 and 2017 C++ standard library headers.
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Users should generally expect this to be regularly raised to match the most
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recently released version of the Visual C++ compiler.
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- clang now defaults to ``.init_array`` if no gcc installation can be found.
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If a gcc installation is found, it still prefers ``.ctors`` if the found
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gcc is older than 4.7.0.
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- The new builtin preprocessor macros ``__is_target_arch``,
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``__is_target_vendor``, ``__is_target_os``, and ``__is_target_environment``
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can be used to to examine the individual components of the target triple.
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- ...
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Improvements to Clang's diagnostics
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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-----------------------------------
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- ``-Wpragma-pack`` is a new warning that warns in the following cases:
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@ -61,7 +82,7 @@ Improvements to Clang's diagnostics
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selector which could make the message send to ``id`` ambiguous.
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- ``-Wtautological-compare`` now warns when comparing an unsigned integer and 0
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regardless of whether the constant is signed or unsigned."
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regardless of whether the constant is signed or unsigned.
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- ``-Wtautological-compare`` now warns about comparing a signed integer and 0
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when the signed integer is coerced to an unsigned type for the comparison.
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@ -90,37 +111,37 @@ Improvements to Clang's diagnostics
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- ``-Wunreachable-code`` can now reason about ``__try``, ``__except`` and
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``__leave``.
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Non-comprehensive list of changes in this release
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-------------------------------------------------
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- Bitrig OS was merged back into OpenBSD, so Bitrig support has been
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removed from Clang/LLVM.
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- The default value of _MSC_VER was raised from 1800 to 1911, making it
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compatible with the Visual Studio 2015 and 2017 C++ standard library headers.
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Users should generally expect this to be regularly raised to match the most
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recently released version of the Visual C++ compiler.
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- clang now defaults to ``.init_array`` if no gcc installation can be found.
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If a gcc installation is found, it still prefers ``.ctors`` if the found
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gcc is older than 4.7.0.
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- The new builtin preprocessor macros ``__is_target_arch``,
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``__is_target_vendor``, ``__is_target_os``, and ``__is_target_environment``
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can be used to to examine the individual components of the target triple.
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New Compiler Flags
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------------------
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- --autocomplete was implemented to obtain a list of flags and its arguments. This is used for shell autocompletion.
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- Clang supports the ``-mretpoline`` flag to enable `retpolines
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<https://support.google.com/faqs/answer/7625886>`_. Code compiled with this
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flag will be hardened against variant #2 of the Spectre attack. Indirect
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branches from switches or gotos removed from the code, and indirect calls
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will be made through a "retpoline" thunk. The necessary thunks will
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automatically be inserted into the generated code. Clang also supports
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``-mretpoline-external-thunk`` which works like ``-mretpoline`` but requires
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the user to provide their own thunk definitions. The external thunk names
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start with ``__x86_indirect_thunk_`` and end in a register name. For 64-bit
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platforms, only an ``r11`` thunk is used, but for 32-bit platforms ``eax``,
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``ecx``, ``edx``, and ``edi`` thunks are used.
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- Clang now supports configuration files. These are collections of driver
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options, which can be applied by specifying the configuration file, either
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using command line option ``--config foo.cfg`` or encoding it into executable
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name ``foo-clang``. Clang behaves as if the options from this file were inserted
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before the options specified in command line. This feature is primary intended
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to facilitate cross compilation. Details can be found in
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`Clang Compiler User's Manual <UsersManual.html#configuration-files>`_.
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- The ``-fdouble-square-bracket-attributes`` and corresponding
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``-fno-double-square-bracket-attributes`` flags were added to enable or
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disable [[]] attributes in any language mode. Currently, only a limited
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disable ``[[]]`` attributes in any language mode. Currently, only a limited
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number of attributes are supported outside of C++ mode. See the Clang
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attribute documentation for more information about which attributes are
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supported for each syntax.
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`attribute documentation <AttributeReference.html>`_ for more information
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about which attributes are supported for each syntax.
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- Added the ``-std=c17``, ``-std=gnu17``, and ``-std=iso9899:2017`` language
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mode flags for compatibility with GCC. This enables support for the next
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version of the C standard, expected to be published by ISO in 2018. The only
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@ -135,19 +156,6 @@ New Compiler Flags
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- New ``-nostdlib++`` flag to disable linking the C++ standard library. Similar
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to using ``clang`` instead of ``clang++`` but doesn't disable ``-lm``.
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Deprecated Compiler Flags
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-------------------------
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The following options are deprecated and ignored. They will be removed in
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future versions of Clang.
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- ...
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New Pragmas in Clang
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-----------------------
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Clang now supports the ...
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Attribute Changes in Clang
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--------------------------
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@ -157,25 +165,15 @@ Attribute Changes in Clang
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in the ``clang`` vendor namespace (``[[clang::name]]``). Attributes whose
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syntax is specified by some other standard (such as CUDA and OpenCL
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attributes) continue to follow their respective specification.
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- Added the ``__has_c_attribute()`` builtin preprocessor macro which allows
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users to dynamically detect whether a double square-bracket attribute is
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supported in C mode. This attribute syntax can be enabled with the
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``-fdouble-square-bracket-attributes`` flag.
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- The presence of __attribute__((availability(...))) on a declaration no longer
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implies default visibility for that declaration on macOS.
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- Clang now supports configuration files. These are collections of driver
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options, which can be applied by specifying the configuration file, either
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using command line option `--config foo.cfg` or encoding it into executable
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name `foo-clang`. Clang behaves as if the options from this file were inserted
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before the options specified in command line. This feature is primary intended
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to facilitate cross compilation. Details can be found in
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`Clang Compiler User's Manual
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<http://clang.llvm.org/docs/UsersManual.html#configuration-files>`.
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- The presence of ``__attribute__((availability(...)))`` on a declaration no
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longer implies default visibility for that declaration on macOS.
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- ...
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Windows Support
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---------------
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@ -185,17 +183,6 @@ Windows Support
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- clang-cl now exposes the ``--version`` flag.
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C Language Changes in Clang
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---------------------------
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- ...
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...
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C11 Feature Support
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^^^^^^^^^^^^^^^^^^^
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...
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C++ Language Changes in Clang
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-----------------------------
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@ -205,20 +192,38 @@ C++ Language Changes in Clang
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conforming GNU extensions. Projects incompatible with C++14 can add
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``-std=gnu++98`` to their build settings to restore the previous behaviour.
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C++1z Feature Support
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^^^^^^^^^^^^^^^^^^^^^
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- Added support for some features from the C++ standard after C++17
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(provisionally known as C++2a but expected to be C++20). This support can be
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enabled with the ``-std=c++2a`` flag. This enables:
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...
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- Support for ``__VA_OPT__``, to allow variadic macros to easily provide
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different expansions when they are invoked without variadic arguments.
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Objective-C Language Changes in Clang
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-------------------------------------
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- Recognition of the ``<=>`` token (the C++2a three-way comparison operator).
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...
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- Support for default member initializers for bit-fields.
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- Lambda capture of ``*this``.
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- Pointer-to-member calls using ``const &``-qualified pointers on temporary objects.
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All of these features other than ``__VA_OPT__`` and ``<=>`` are made
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available with a warning in earlier C++ language modes.
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- A warning has been added for a ``<=`` token followed immediately by a ``>``
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character. Code containing such constructs will change meaning in C++2a due
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to the addition of the ``<=>`` operator.
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- Clang implements the "destroying operator delete" feature described in C++
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committee paper `P0722R1
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<http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0722r1.html>`,
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which is targeting inclusion in C++2a but has not yet been voted into the C++
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working draft. Support for this feature is enabled by the presence of the
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standard library type ``std::destroying_delete_t``.
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OpenCL C Language Changes in Clang
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----------------------------------
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- Added subgroup builtins to enqueue kernel support.
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- Added CL2.0 atomics as Clang builtins that now accept
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@ -258,77 +263,72 @@ OpenCL C Language Changes in Clang
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- Miscellaneous improvements in vector diagnostics.
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- Added half float load and store builtins without enabling half as a legal type
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(``__builtin_store_half for double``, ``__builtin_store_halff`` for double,
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``__builtin_load_half for double``, ``__builtin_load_halff`` for float).
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(``__builtin_store_half`` for double, ``__builtin_store_halff`` for float,
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``__builtin_load_half`` for double, ``__builtin_load_halff`` for float).
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OpenMP Support in Clang
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----------------------------------
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- Added options `-f[no]-openmp-simd` that support code emission only for OpenMP
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SIMD-based directives, like `#pragma omp simd`, `#pragma omp parallel for simd`
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etc. The code is emitted only for simd-based part of the combined directives
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- Added options ``-f[no]-openmp-simd`` that support code emission only for OpenMP
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SIMD-based directives, like ``#pragma omp simd``, ``#pragma omp parallel for simd``
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etc. The code is emitted only for SIMD-based part of the combined directives
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and clauses.
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- Added support for almost all target-based directives except for
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`#pragma omp target teams distribute parallel for [simd]`. Although, please
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note that `depend` clauses on target-based directives are not supported yet.
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``#pragma omp target teams distribute parallel for [simd]``. Although, please
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note that ``depend`` clauses on target-based directives are not supported yet.
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Clang supports offloading to X86_64, AArch64 and PPC64[LE] devices.
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- Added support for `reduction`-based clauses on `task`-based directives from
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- Added support for ``reduction``-based clauses on ``task``-based directives from
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upcoming OpenMP 5.0.
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- The LLVM OpenMP runtime `libomp` now supports the OpenMP Tools Interface (OMPT)
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- The LLVM OpenMP runtime ``libomp`` now supports the OpenMP Tools Interface (OMPT)
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on x86, x86_64, AArch64, and PPC64 on Linux, Windows, and macOS. If you observe
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a measurable performance impact on one of your applications without a tool
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attached, please rebuild the runtime library with `-DLIBOMP_OMPT_SUPPORT=OFF` and
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attached, please rebuild the runtime library with ``-DLIBOMP_OMPT_SUPPORT=OFF`` and
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file a bug at `LLVM's Bugzilla <https://bugs.llvm.org/>`_ or send a message to the
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`OpenMP development list <http://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev>`_.
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Internal API Changes
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--------------------
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These are major API changes that have happened since the 4.0.0 release of
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Clang. If upgrading an external codebase that uses Clang as a library,
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this section should help get you past the largest hurdles of upgrading.
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- ...
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AST Matchers
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------------
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The hasDeclaration matcher now works the same for Type and QualType and only
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The ``hasDeclaration`` matcher now works the same for ``Type`` and ``QualType`` and only
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ever looks through one level of sugaring in a limited number of cases.
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There are two main patterns affected by this:
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- qualType(hasDeclaration(recordDecl(...))): previously, we would look through
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sugar like TypedefType to get at the underlying recordDecl; now, we need
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- ``qualType(hasDeclaration(recordDecl(...)))``: previously, we would look through
|
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sugar like ``TypedefType`` to get at the underlying ``recordDecl``; now, we need
|
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to explicitly remove the sugaring:
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qualType(hasUnqualifiedDesugaredType(hasDeclaration(recordDecl(...))))
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``qualType(hasUnqualifiedDesugaredType(hasDeclaration(recordDecl(...))))``
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- hasType(recordDecl(...)): hasType internally uses hasDeclaration; previously,
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this matcher used to match for example TypedefTypes of the RecordType, but
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- ``hasType(recordDecl(...))``: ``hasType`` internally uses ``hasDeclaration``; previously,
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this matcher used to match for example ``TypedefTypes`` of the ``RecordType``, but
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after the change they don't; to fix, use:
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::
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hasType(hasUnqualifiedDesugaredType(
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recordType(hasDeclaration(recordDecl(...)))))
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.. code-block:: c
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- templateSpecializationType(hasDeclaration(classTemplateDecl(...))):
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previously, we would directly match the underlying ClassTemplateDecl;
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now, we can explicitly match the ClassTemplateSpecializationDecl, but that
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requires to explicitly get the ClassTemplateDecl:
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hasType(hasUnqualifiedDesugaredType(
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recordType(hasDeclaration(recordDecl(...)))))
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|
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- ``templateSpecializationType(hasDeclaration(classTemplateDecl(...)))``:
|
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previously, we would directly match the underlying ``ClassTemplateDecl``;
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now, we can explicitly match the ``ClassTemplateSpecializationDecl``, but that
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requires to explicitly get the ``ClassTemplateDecl``:
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.. code-block:: c
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templateSpecializationType(hasDeclaration(
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classTemplateSpecializationDecl(
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hasSpecializedTemplate(classTemplateDecl(...)))))
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|
||||
::
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templateSpecializationType(hasDeclaration(
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classTemplateSpecializationDecl(
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hasSpecializedTemplate(classTemplateDecl(...)))))
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clang-format
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||||
------------
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* Option *IndentPPDirectives* added to indent preprocessor directives on
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* Option ``IndentPPDirectives`` added to indent preprocessor directives on
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conditionals.
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+----------------------+----------------------+
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@ -343,10 +343,10 @@ clang-format
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| #endif | #endif |
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+----------------------+----------------------+
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* Option -verbose added to the command line.
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* Option ``-verbose`` added to the command line.
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Shows the list of processed files.
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* Option *IncludeBlocks* added to merge and regroup multiple ``#include`` blocks during sorting.
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* Option ``IncludeBlocks`` added to merge and regroup multiple ``#include`` blocks during sorting.
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||||
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+-------------------------+-------------------------+-------------------------+
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| Before (Preserve) | Merge | Regroup |
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@ -359,19 +359,13 @@ clang-format
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| #include <lib/main.h> | | #include <lib/main.h> |
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+-------------------------+-------------------------+-------------------------+
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libclang
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--------
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|
||||
...
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|
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Static Analyzer
|
||||
---------------
|
||||
|
||||
- Static Analyzer can now properly detect and diagnose unary pre-/post-
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- The Static Analyzer can now properly detect and diagnose unary pre-/post-
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||||
increment/decrement on an uninitialized value.
|
||||
|
||||
...
|
||||
|
||||
Undefined Behavior Sanitizer (UBSan)
|
||||
------------------------------------
|
||||
@ -381,25 +375,6 @@ Undefined Behavior Sanitizer (UBSan)
|
||||
issue logging and deduplication, and does not support ``-fsanitize=vptr``
|
||||
checking.
|
||||
|
||||
Core Analysis Improvements
|
||||
==========================
|
||||
|
||||
- ...
|
||||
|
||||
New Issues Found
|
||||
================
|
||||
|
||||
- ...
|
||||
|
||||
Python Binding Changes
|
||||
----------------------
|
||||
|
||||
The following methods have been added:
|
||||
|
||||
- ...
|
||||
|
||||
Significant Known Problems
|
||||
==========================
|
||||
|
||||
Additional Information
|
||||
======================
|
||||
|
||||
@ -353,7 +353,7 @@ available in C.
|
||||
|
||||
int isdigit(int c);
|
||||
int isdigit(int c) __attribute__((enable_if(c <= -1 || c > 255, "chosen when 'c' is out of range"))) __attribute__((unavailable("'c' must have the value of an unsigned char or EOF")));
|
||||
|
||||
|
||||
void foo(char c) {
|
||||
isdigit(c);
|
||||
isdigit(10);
|
||||
@ -406,7 +406,7 @@ overload out of a number of viable overloads using enable_if.
|
||||
|
||||
void f() __attribute__((enable_if(true, ""))); // #1
|
||||
void f() __attribute__((enable_if(true, ""))) __attribute__((enable_if(true, ""))); // #2
|
||||
|
||||
|
||||
void g(int i, int j) __attribute__((enable_if(i, ""))); // #1
|
||||
void g(int i, int j) __attribute__((enable_if(j, ""))) __attribute__((enable_if(true))); // #2
|
||||
|
||||
@ -918,11 +918,11 @@ default name.
|
||||
can only be placed before an @protocol or @interface declaration:
|
||||
|
||||
.. code-block:: objc
|
||||
|
||||
|
||||
__attribute__((objc_runtime_name("MyLocalName")))
|
||||
@interface Message
|
||||
@end
|
||||
|
||||
|
||||
}];
|
||||
}
|
||||
|
||||
@ -1228,7 +1228,7 @@ potentially-evaluated discarded-value expression that is not explicitly cast to
|
||||
.. code-block: c++
|
||||
struct [[nodiscard]] error_info { /*...*/ };
|
||||
error_info enable_missile_safety_mode();
|
||||
|
||||
|
||||
void launch_missiles();
|
||||
void test_missiles() {
|
||||
enable_missile_safety_mode(); // diagnoses
|
||||
@ -2641,23 +2641,23 @@ used to process multiple arguments from a single invocation from a SIMD loop
|
||||
concurrently.
|
||||
The syntax of the `declare simd` construct is as follows:
|
||||
|
||||
.. code-block:: c
|
||||
.. code-block:: none
|
||||
|
||||
#pragma omp declare simd [clause[[,] clause] ...] new-line
|
||||
[#pragma omp declare simd [clause[[,] clause] ...] new-line]
|
||||
[...]
|
||||
function definition or declaration
|
||||
#pragma omp declare simd [clause[[,] clause] ...] new-line
|
||||
[#pragma omp declare simd [clause[[,] clause] ...] new-line]
|
||||
[...]
|
||||
function definition or declaration
|
||||
|
||||
where clause is one of the following:
|
||||
|
||||
.. code-block:: c
|
||||
.. code-block:: none
|
||||
|
||||
simdlen(length)
|
||||
linear(argument-list[:constant-linear-step])
|
||||
aligned(argument-list[:alignment])
|
||||
uniform(argument-list)
|
||||
inbranch
|
||||
notinbranch
|
||||
simdlen(length)
|
||||
linear(argument-list[:constant-linear-step])
|
||||
aligned(argument-list[:alignment])
|
||||
uniform(argument-list)
|
||||
inbranch
|
||||
notinbranch
|
||||
|
||||
}];
|
||||
}
|
||||
@ -2673,9 +2673,9 @@ The syntax of the declare target directive is as follows:
|
||||
|
||||
.. code-block:: c
|
||||
|
||||
#pragma omp declare target new-line
|
||||
declarations-definition-seq
|
||||
#pragma omp end declare target new-line
|
||||
#pragma omp declare target new-line
|
||||
declarations-definition-seq
|
||||
#pragma omp end declare target new-line
|
||||
}];
|
||||
}
|
||||
|
||||
|
||||
@ -36,7 +36,7 @@ std::string getClangRepositoryPath() {
|
||||
|
||||
// If the SVN_REPOSITORY is empty, try to use the SVN keyword. This helps us
|
||||
// pick up a tag in an SVN export, for example.
|
||||
StringRef SVNRepository("$URL: https://llvm.org/svn/llvm-project/cfe/branches/release_60/lib/Basic/Version.cpp $");
|
||||
StringRef SVNRepository("$URL: https://llvm.org/svn/llvm-project/cfe/tags/RELEASE_600/final/lib/Basic/Version.cpp $");
|
||||
if (URL.empty()) {
|
||||
URL = SVNRepository.slice(SVNRepository.find(':'),
|
||||
SVNRepository.find("/lib/Basic"));
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user