[flang] Implement GETUID and GETGID intrinsics (#110679)

GETUID and GETGID are non-standard intrinsics supported by a number of
other Fortran compilers. On supported platforms these intrinsics simp

[flang] Implement GETUID and GETGID intrinsics (#110679)

GETUID and GETGID are non-standard intrinsics supported by a number of
other Fortran compilers. On supported platforms these intrinsics simply
call the POSIX getuid() and getgid() functions and return the result.
The only platform we support that does not have these is Windows.

Windows does not have the same concept of UIDs and GIDs, so on Windows
we issue a warning indicating this and return 1 from both functions.

Co-authored-by: Yi Wu <yi.wu2@arm.com>

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Revert "[flang] Implement GETUID and GETGID intrinsics" (#110531)

Reverts llvm/llvm-project#108017

[flang] Implement GETUID and GETGID intrinsics (#108017)

GETUID and GETGID are non-standard intrinsics supported by a number of
other Fortran compilers. On supported platforms these intrinsics simp

[flang] Implement GETUID and GETGID intrinsics (#108017)

GETUID and GETGID are non-standard intrinsics supported by a number of
other Fortran compilers. On supported platforms these intrinsics simply
call the POSIX getuid() and getgid() functions and return the result.
The only platform we support that does not have these is Windows.

Windows does not have the same concept of UIDs and GIDs, so on Windows
we issue a warning indicating this and return 1 from both functions.

Co-authored-by: Yi Wu <yi.wu2@arm.com>

---------

Co-authored-by: Yi Wu <yi.wu2@arm.com>

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[flang] GETPID runtime and lower intrinsic implementation (#70442)

Runtime function GetPID calls the function getpid
from unistd.h or process.h base on the OS.

[flang] Single entry point for GET_ENVIRONMENT_VARIABLE

This patch refactors the runtime support for GET_ENVIRONMENT_VARIABLE
to have a single entry point instead of 2. It also updates lowering
acco

[flang] Single entry point for GET_ENVIRONMENT_VARIABLE

This patch refactors the runtime support for GET_ENVIRONMENT_VARIABLE
to have a single entry point instead of 2. It also updates lowering
accordingly.

This makes it easier to handle dynamically optional arguments.
See also https://reviews.llvm.org/D118777

Reviewed By: jeanPerier

Differential Revision: https://reviews.llvm.org/D142489

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[flang] Single entry point for GET_COMMAND_ARGUMENT

This patch refactors the runtime support for GET_COMMAND_ARGUMENT to
have a single entry point instead of 2. It also updates lowering
accordingly.

[flang] Single entry point for GET_COMMAND_ARGUMENT

This patch refactors the runtime support for GET_COMMAND_ARGUMENT to
have a single entry point instead of 2. It also updates lowering
accordingly.

This makes it easier to handle dynamically optional arguments. See also
https://reviews.llvm.org/D118777

Differential Revision: https://reviews.llvm.org/D130475

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[flang] D123388 fix - remove unused variable from test

[flang] Lower optionals in GET_COMMAND_ARGUMENT and GET_ENVIRONMENT_VARIABLE

Handle dynamic optional argument in GET_COMMAND_ARGUMENT and GET_ENVIRONMENT_VARIABLE
(previously compiled but caused se

[flang] Lower optionals in GET_COMMAND_ARGUMENT and GET_ENVIRONMENT_VARIABLE

Handle dynamic optional argument in GET_COMMAND_ARGUMENT and GET_ENVIRONMENT_VARIABLE
(previously compiled but caused segfaults). The previous code
handled static presence/absence aspects, but not when an absent dummy optional was
passed to one of the optional intrinsic arguments.

Simplify the runtime call lowering to simply lower the runtime call without
dealing with optionality there. This keeps the optional handling logic in
IntrinsicCall.cpp.

Note that the new code will generate some extra "if (not null addr )/then/else"
when the actual arguments are always there at runtime. That makes the implementation
a lot simpler/safer, and I think it is OK for now (I do not expect these runtime
function to be called in hot loop nests).

Differential Revision: https://reviews.llvm.org/D123388

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[flang] Upstream partial lowering of GET_ENVIRONMENT_VARIABLE intrinsic

This patch adds partial lowering of the "GET_ENVIRONMENT_VARIABLE" intrinsic
to the backend runtime hook implemented in patche

[flang] Upstream partial lowering of GET_ENVIRONMENT_VARIABLE intrinsic

This patch adds partial lowering of the "GET_ENVIRONMENT_VARIABLE" intrinsic
to the backend runtime hook implemented in patches D111394 and D112698.
It also renames the `isPresent` lambda to `isAbsent` and moves it out to
its own function in `Command.cpp`. Corresponding comment fixes for this
are also modified. Lastly it adds the i1 type to
`RuntimeCallTestBash.h`.

Differential Revision: https://reviews.llvm.org/D118984

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[flang] Upstream partial lowering of GET_COMMAND_ARGUMENT intrinsic

This patch adds partial lowering of the "GET_COMMAND_ARGUMENT"
intrinsic to the backend runtime hook implemented in patches D10922

[flang] Upstream partial lowering of GET_COMMAND_ARGUMENT intrinsic

This patch adds partial lowering of the "GET_COMMAND_ARGUMENT"
intrinsic to the backend runtime hook implemented in patches D109227,
D109813, D109814.

Differential Revision: https://reviews.llvm.org/D118801

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[flang] Upstream partial lowering of COMMAND_ARGUMENT_COUNT intrinsic

This patch adds partial lowering of the "COMMAND_ARGUMENT_COUNT" intrinsic
to the backend runtime hook implemented in patch D109

[flang] Upstream partial lowering of COMMAND_ARGUMENT_COUNT intrinsic

This patch adds partial lowering of the "COMMAND_ARGUMENT_COUNT" intrinsic
to the backend runtime hook implemented in patch D109048. Also adds a
"helper" function for retrieving the default integer type from
FIRBuilder, which will be used later when finishing the lowering of
intrinsic.

Differential Revision: https://reviews.llvm.org/D117869

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