[OPENMP]Consider 'omp_null_allocator' as a predefined allocator.

Summary:
omp.h header file defines omp_null_allocator as a predefined allocator,
need to consider it also as a predefined allocator.

[OPENMP]Consider 'omp_null_allocator' as a predefined allocator.

Summary:
omp.h header file defines omp_null_allocator as a predefined allocator,
need to consider it also as a predefined allocator.

Reviewers: jdoerfert

Subscribers: jholewinski, yaxunl, guansong, cfe-commits, caomhin

Tags: #clang

Differential Revision: https://reviews.llvm.org/D79186

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[OPENMP50]Basic support for uses_allocators clause.

Summary: Added parsing/sema/serialization supoprt for uses_allocators clause.

Reviewers: jdoerfert

Subscribers: yaxunl, guansong, arphaman, cfe-

[OPENMP50]Basic support for uses_allocators clause.

Summary: Added parsing/sema/serialization supoprt for uses_allocators clause.

Reviewers: jdoerfert

Subscribers: yaxunl, guansong, arphaman, cfe-commits, caomhin

Tags: #clang

Differential Revision: https://reviews.llvm.org/D78577

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[OPENMP50]Basic parsing/sema analysis for order(concurrent) clause.

Added parsing/sema/serialization support for order(concurrent) clause in
loop|simd-based directives.

[OPENMP50]Add parsing/sema analysis for nontemporal clause.

Add basic support for parsing/sema analysis of the nontemporal clause in
simd-based directives.

[OPENMP50]Add if clause in target parallel for simd directive.

According to OpenMP 5.0, if clause can be used in for simd directive. If
condition in the if clause is false, the non-vectorized versio

[OPENMP50]Add if clause in target parallel for simd directive.

According to OpenMP 5.0, if clause can be used in for simd directive. If
condition in the if clause is false, the non-vectorized version of the
loop must be executed.

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[OPENMP]Moved warning fo mapping non-trivially copiable types into a
separate group.

Need to move this warning into a separate group to make easier to
disable this warning, if required.

[OPENMP]Fix PR41767: diagnose DSA for variables in clauses with default(none).

If the combined directive has default(none) clause and has clauses for
inner directive that reference some variables, f

[OPENMP]Fix PR41767: diagnose DSA for variables in clauses with default(none).

If the combined directive has default(none) clause and has clauses for
inner directive that reference some variables, for which data-sharing
attributes are not specified, the error messages should be emitted for
such variables.

llvm-svn: 360365

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Revert "[OPENMP]Fix PR41767: diagnose DSA for variables in clauses with default(none)."

This implementation isn't sound as per the standard.
It erroneously diagnoses e.g. the following case:
```
$ c

Revert "[OPENMP]Fix PR41767: diagnose DSA for variables in clauses with default(none)."

This implementation isn't sound as per the standard.
It erroneously diagnoses e.g. the following case:
```
$ cat test.cpp
void f(int n) {
#pragma omp parallel default(none) if(n)
;
}
```
```
$ ./bin/clang -fopenmp test.cpp
test.cpp:2:40: error: variable 'n' must have explicitly specified data sharing attributes
#pragma omp parallel default(none) if(n)
^
test.cpp:2:31: note: explicit data sharing attribute requested here
#pragma omp parallel default(none) if(n)
^
1 error generated.
```

As per OpenMP Application Programming Interface Version 5.0 November 2018:
* 2.19.4.1default Clause
The default clause explicitly determines the data-sharing attributes of
variables that are referenced *in a parallel, teams, or task generating
construct and would otherwise be implicitly determined
(see Section 2.19.1.1 on page 270).
* 2.6.1 Determining the Number of Threads for a parallel Region
Using a variable in an if or num_threads clause expression of a parallel
construct causes an implicit reference to the variable in all enclosing
constructs. The if clause expression and the num_threads clause expression
are evaluated in the context outside of the parallel construct,

This reverts commit r360073.

llvm-svn: 360326

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[OPENMP]Fix PR41767: diagnose DSA for variables in clauses with
default(none).

If the combined directive has default(none) clause and has clauses for
inner directive that reference some variables, f

[OPENMP]Fix PR41767: diagnose DSA for variables in clauses with
default(none).

If the combined directive has default(none) clause and has clauses for
inner directive that reference some variables, for which data-sharing
attributes are not specified, the error messages should be emitted for
such variables.

llvm-svn: 360073

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[OPENMP]Initial support for 'allocate' clause.

Added parsing/sema analysis of the allocate clause.

llvm-svn: 357068

[OPENMP] Emit warning for non-trivial types in map clauses.

If the mapped type is non-trivial, the warning message is emitted for
better user experience.

llvm-svn: 326251

[OpenMP] Fix trailing space when printing pragmas, by Joel. E. Denny

Summary:
-ast-print prints omp pragmas with a trailing space. While this
behavior is likely of little concern to most users, sur

[OpenMP] Fix trailing space when printing pragmas, by Joel. E. Denny

Summary:
-ast-print prints omp pragmas with a trailing space. While this
behavior is likely of little concern to most users, surely it's
unintentional, and it's annoying for some source-level work I'm
pursuing. This patch focuses on omp pragmas, but it also fixes
init_seg and loop hint pragmas because they share implementation.

The testing strategy here is to add usually just one '{{$}}' per
relevant -ast-print test file. This seems to achieve good code
coverage. However, this strategy is probably easy to forget as the
tests evolve. That's probably fine as this fix is far from critical.
The main goal of the testing is to aid the initial review.

This patch also adds a fixme for "#pragma unroll", which prints as
"#pragma unroll (enable)", which is invalid syntax.

Reviewers: ABataev

Reviewed By: ABataev

Subscribers: guansong, cfe-commits

Differential Revision: https://reviews.llvm.org/D43204

llvm-svn: 325145

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[OPENMP] Support for -fopenmp-simd option with compilation of simd loops
only.

Added support for -fopenmp-simd option that allows compilation of
simd-based constructs without emission of OpenMP runt

[OPENMP] Support for -fopenmp-simd option with compilation of simd loops
only.

Added support for -fopenmp-simd option that allows compilation of
simd-based constructs without emission of OpenMP runtime calls.

llvm-svn: 321560

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[OPENMP] Treat '#pragma omp target parallel for simd' as simd directive.

`#pragma omp target parallel for simd` mistakenly was not treated as a
simd directive, fixed this problem.

llvm-svn: 317811

[OPENMP] Fix for PR31428: variable named like directive name modifier

Directive name modifiers in 'if' clause are allowed only for OpenMP 4.5
and higher + in OpenMP 4.5 parsing procedure emits error

[OPENMP] Fix for PR31428: variable named like directive name modifier

Directive name modifiers in 'if' clause are allowed only for OpenMP 4.5
and higher + in OpenMP 4.5 parsing procedure emits error message if ':'
is not found after directive name modifier.

llvm-svn: 290175

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Make output of -ast-print a valid C++ code.

Output generated by option -ast-print looks like C/C++ code, and it
really is for plain C. For C++ the produced output was not valid C++
code, but the dif

Make output of -ast-print a valid C++ code.

Output generated by option -ast-print looks like C/C++ code, and it
really is for plain C. For C++ the produced output was not valid C++
code, but the differences were small. With this change the output
is fixed and can be compiled. Tests are changed so that output produced
by -ast-print is compiled again with the same flags and both outputs are
compared.

Option -ast-print is extensively used in clang tests but it itself
was tested poorly, existing tests only checked that compiler did not
crash. There are unit tests in file DeclPrinterTest.cpp, but they test
only terse output mode.

Differential Revision: https://reviews.llvm.org/D26452

llvm-svn: 286439

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[OpenMP] Sema and parsing for 'target parallel for simd' pragma

This patch is to implement sema and parsing for 'target parallel for simd' pragma.

Differential Revision: http://reviews.llvm.org/D22

[OpenMP] Sema and parsing for 'target parallel for simd' pragma

This patch is to implement sema and parsing for 'target parallel for simd' pragma.

Differential Revision: http://reviews.llvm.org/D22096

llvm-svn: 275365

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