[flang][runtime] Disable optimization for traceback related functions. (#124172)

The backtrace may at least print the backtrace name in the call stack,
but this does not happen with the release bui

[flang][runtime] Disable optimization for traceback related functions. (#124172)

The backtrace may at least print the backtrace name in the call stack,
but this does not happen with the release builds of the runtime.
Surprisingly, specifying "no-omit-frame-pointer" did not work
with GCC, so I decided to fall back to -O0 for these functions.

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flang: fix backtrace build on FreeBSD (#120297)

FreeBSD's libexecinfo defines backtrace with a size_t for the size
argument and return type. This almost certainly doesn't make sense, but
what's do

flang: fix backtrace build on FreeBSD (#120297)

FreeBSD's libexecinfo defines backtrace with a size_t for the size
argument and return type. This almost certainly doesn't make sense, but
what's done is done so cast the output to allow compilation. Otherwise
we get:

.../flang/runtime/stop.cpp:165:13: error: non-constant-expression cannot
be narrowed from type 'size_t' (aka 'unsigned long') to 'int' in
initializer list [-Wc++11-narrowing]
165 | int nptrs{backtrace(buffer, MAX_CALL_STACK)};
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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Backtrace support for flang (#118179)

Fixed build failures in old PRs due to missing files

Revert "[flang]Add new intrinsic function backtrace and complete the TODO of abort" (#117990)

Reverts llvm/llvm-project#117603 due to failed buildbot
https://lab.llvm.org/buildbot/#/builders/152/bu

Revert "[flang]Add new intrinsic function backtrace and complete the TODO of abort" (#117990)

Reverts llvm/llvm-project#117603 due to failed buildbot
https://lab.llvm.org/buildbot/#/builders/152/builds/710

The important bit of the log was
```
FAILED: CMakeFiles/FortranRuntime.dir/stop.cpp.o
ccache /usr/bin/g++ -DFLANG_LITTLE_ENDIAN=1 -DGTEST_HAS_RTTI=0 -DRT_USE_LIBCUDACXX=1 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/buildbot/worker/as-builder-7/ramdisk/flang-runtime-cuda-gcc/llvm-project/flang/runtime/../include -I/home/buildbot/worker/as-builder-7/ramdisk/flang-runtime-cuda-gcc/build -I/home/buildbot/worker/third-party/nv/cccl/libcudacxx/include -fvisibility-inlines-hidden -Werror=date-time -fno-lifetime-dse -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -Wimplicit-fallthrough -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -fno-lto -O3 -DNDEBUG -U_GLIBCXX_ASSERTIONS -U_LIBCPP_ENABLE_ASSERTIONS -UNDEBUG -std=c++17 -fno-exceptions -fno-unwind-tables -fno-asynchronous-unwind-tables -fno-rtti -MD -MT CMakeFiles/FortranRuntime.dir/stop.cpp.o -MF CMakeFiles/FortranRuntime.dir/stop.cpp.o.d -o CMakeFiles/FortranRuntime.dir/stop.cpp.o -c /home/buildbot/worker/as-builder-7/ramdisk/flang-runtime-cuda-gcc/llvm-project/flang/runtime/stop.cpp
/home/buildbot/worker/as-builder-7/ramdisk/flang-runtime-cuda-gcc/llvm-project/flang/runtime/stop.cpp:19:10: fatal error: llvm/Config/config.h: No such file or directory
19 | #include "llvm/Config/config.h"
| ^~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
```

CC @dty2

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[flang]Add new intrinsic function backtrace and complete the TODO of abort (#117603)

Hey guys, I found that Flang's built-in ABORT function is incomplete
when I was using it. Compared with gfortran

[flang]Add new intrinsic function backtrace and complete the TODO of abort (#117603)

Hey guys, I found that Flang's built-in ABORT function is incomplete
when I was using it. Compared with gfortran's ABORT (which can both
abort and print out a backtrace), flang's ABORT implementation lacks the
function of printing out a backtrace. This feature is essential for
debugging and understanding the call stack at the failure point.

To solve this problem, I completed the "// TODO:" of the abort function,
and then implemented an additional built-in function BACKTRACE for
flang. After a brief reading of the relevant source code, I used
backtrace and backtrace_symbols in "execinfo.h" to quickly implement
this. But since I used the above two functions directly, my
implementation is slightly different from gfortran's implementation (in
the output, the function call stack before main is additionally output,
and the function line number is missing). In addition, since I used the
above two functions, I did not need to add -g to embed debug information
into the ELF file, but needed -rdynamic to ensure that the symbols are
added to the dynamic symbol table (so that the function name will be
printed out).

Here is a comparison of the output between gfortran 's backtrace and my
implementation:
gfortran's implemention output:
```
#0 0x557eb71f4184 in testfun2_
at /home/hunter/plct/fortran/test.f90:5
#1 0x557eb71f4165 in testfun1_
at /home/hunter/plct/fortran/test.f90:13
#2 0x557eb71f4192 in test_backtrace
at /home/hunter/plct/fortran/test.f90:17
#3 0x557eb71f41ce in main
at /home/hunter/plct/fortran/test.f90:18
```
my impelmention output:
```
Backtrace:
#0 ./test(_FortranABacktrace+0x32) [0x574f07efcf92]
#1 ./test(testfun2_+0x14) [0x574f07efc7b4]
#2 ./test(testfun1_+0xd) [0x574f07efc7cd]
#3 ./test(_QQmain+0x9) [0x574f07efc7e9]
#4 ./test(main+0x12) [0x574f07efc802]
#5 /usr/lib/libc.so.6(+0x25e08) [0x76954694fe08]
#6 /usr/lib/libc.so.6(__libc_start_main+0x8c) [0x76954694fecc]
#7 ./test(_start+0x25) [0x574f07efc6c5]
```
test program is:
```
function testfun2() result(err)
implicit none
integer :: err
err = 1
call backtrace
end function testfun2

subroutine testfun1()
implicit none
integer :: err
integer :: testfun2

err = testfun2()
end subroutine testfun1

program test_backtrace
call testfun1()
end program test_backtrace
```
I am well aware of the importance of line numbers, so I am now working
on implementing line numbers (by parsing DWARF information) and
supporting cross-platform (Windows) support.

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[Flang][Runtime] Handle missing definitions in <cfenv> (#101242)

According to the C99 standard, <fenv.h> may not define FE_INVALID and
the likes. Even if C++11 mandate them, musl and emscripten don

[Flang][Runtime] Handle missing definitions in <cfenv> (#101242)

According to the C99 standard, <fenv.h> may not define FE_INVALID and
the likes. Even if C++11 mandate them, musl and emscripten don't provide
them, so handle that case.

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[flang] Support extention intrinsic ABORT

The semantic checks and runtime have been supported. This supports the
lowering of intrinsic ABORT.

`gfortran` prints a backtrace before abort, unless `-fn

[flang] Support extention intrinsic ABORT

The semantic checks and runtime have been supported. This supports the
lowering of intrinsic ABORT.

`gfortran` prints a backtrace before abort, unless `-fno-backtrace` is
given. This is good to use. The intrinsic BACKTRACE is not supported
yet, so add TODO in the runtime.

This extention is needed in SPEC2017 521.wrf_r in
https://github.com/llvm/llvm-project/issues/55955.

Reviewed By: klausler

Differential Revision: https://reviews.llvm.org/D130439

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[flang] Rename the runtime routine that reports a fatal user error

As per Steve Scalpone's suggestion, I've renamed the runtime routine to
better evoke its purpose.

I implemented a routine called "

[flang] Rename the runtime routine that reports a fatal user error

As per Steve Scalpone's suggestion, I've renamed the runtime routine to
better evoke its purpose.

I implemented a routine called "Crash" and added a test.

Differential Revision: https://reviews.llvm.org/D118703

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[flang] Implement a runtime routine to report fatal errors with source position

The title says it all.

I implemented a routine called "Crash" and added a test.

Differential Revision: https://revie

[flang] Implement a runtime routine to report fatal errors with source position

The title says it all.

I implemented a routine called "Crash" and added a test.

Differential Revision: https://reviews.llvm.org/D118509

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[flang] Skip `Fortran STOP:` before message when NO_STOP_MESSAGE is set

In 'STOP bye bye', do not print 'Fortran STOP:` before 'bye bye' when
NO_STOP_MESSAGE environment variable is set at runtime.

[flang] Skip `Fortran STOP:` before message when NO_STOP_MESSAGE is set

In 'STOP bye bye', do not print 'Fortran STOP:` before 'bye bye' when
NO_STOP_MESSAGE environment variable is set at runtime.

Also only exit with code 1 in StopStatementText if this is an ERROR STOP.
This matches other compiler behaviors.

Move STOP related unit tests in their own test file and add new tests to
cover this change.

Differential Revision: https://reviews.llvm.org/D114152

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[flang] Respect NO_STOP_MESSAGE=1 in runtime

When an environment variable NO_STOP_MESSAGE=1 is set,
assume that STOP statements with a successful code
have QUIET=.TRUE.

Differential Revision: https

[flang] Respect NO_STOP_MESSAGE=1 in runtime

When an environment variable NO_STOP_MESSAGE=1 is set,
assume that STOP statements with a successful code
have QUIET=.TRUE.

Differential Revision: https://reviews.llvm.org/D113701

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[flang] Front-end and runtime support for CALL EXIT and ABORT

Support the extension intrinsic subroutines EXIT([status]) and ABORT()
in the intrinsic table and runtime support library. Lowering rem

[flang] Front-end and runtime support for CALL EXIT and ABORT

Support the extension intrinsic subroutines EXIT([status]) and ABORT()
in the intrinsic table and runtime support library. Lowering remains
to be done.

Differential Revision: https://reviews.llvm.org/D110741

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[flang] Move runtime API headers to flang/include/flang/Runtime

Move the closure of the subset of flang/runtime/*.h header files that
are referenced by source files outside flang/runtime (apart from

[flang] Move runtime API headers to flang/include/flang/Runtime

Move the closure of the subset of flang/runtime/*.h header files that
are referenced by source files outside flang/runtime (apart from unit tests)
into a new directory (flang/include/flang/Runtime) so that relative
include paths into ../runtime need not be used.

flang/runtime/pgmath.h.inc is moved to flang/include/flang/Evaluate;
it's not used by the runtime.

Differential Revision: https://reviews.llvm.org/D109107

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[flang] Remove *- C++ -* incantation from runtime .cpp files. NFC

We should only need to spell the language out in .h files.

Differential Revision: https://reviews.llvm.org/D109138

[flang] Extend runtime API for PAUSE to allow a stop code

Support integer and default character stop codes on PAUSE
statements. Add length argument to STOP statement with a
character stop code.

Di

[flang] Extend runtime API for PAUSE to allow a stop code

Support integer and default character stop codes on PAUSE
statements. Add length argument to STOP statement with a
character stop code.

Differential revision: https://reviews.llvm.org/D88692

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[flang] Improve output from a STOP statement

Add a missing newline to IEEE FP flag formatting, and
don't neglect to emit STOP when there's no code number.

Reviewed By: tskeith

Differential Revisio

[flang] Improve output from a STOP statement

Add a missing newline to IEEE FP flag formatting, and
don't neglect to emit STOP when there's no code number.

Reviewed By: tskeith

Differential Revision: https://reviews.llvm.org/D84060

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[flang] Add fixes and missing stmts to I/O runtime API handlers (ext. I/O part 8)

Complete the rework of the initial implementation of external I/O
to fix problems found in testing (tests to follow)

[flang] Add fixes and missing stmts to I/O runtime API handlers (ext. I/O part 8)

Complete the rework of the initial implementation of external I/O
to fix problems found in testing (tests to follow); add handlers
for hitherto unimplemented PAUSE, FLUSH, ENDFILE, BACKSPACE, and
REWIND statements.

Reviewed By: tskeith, sscalpone

Differential Revision: https://reviews.llvm.org/D83162

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[flang] Roll up small fixes to runtime bugs found in testing

Summary:
Fix several bugs in the Fortran runtime found in initial
testing.

Reviewers: tskeith, PeteSteinfeld, sscalpone, jdoerfert, Davi

[flang] Roll up small fixes to runtime bugs found in testing

Summary:
Fix several bugs in the Fortran runtime found in initial
testing.

Reviewers: tskeith, PeteSteinfeld, sscalpone, jdoerfert, DavidTruby

Reviewed By: tskeith, PeteSteinfeld

Subscribers: llvm-commits, flang-commits

Tags: #flang, #llvm

Differential Revision: https://reviews.llvm.org/D82116

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[flang] Reformat with latest clang-format and .clang-format

Original-commit: flang-compiler/f18@9fe84f45d7fd685051004678d6b5775dcc4c6f8f
Reviewed-on: https://github.com/flang-compiler/f18/pull/1094

[flang] Progress on Fortran I/O runtime

Use internal units for internal I/O state

Replace use of virtual functions

reference_wrapper

Internal formatted output to array descriptor

Delete dead cod

[flang] Progress on Fortran I/O runtime

Use internal units for internal I/O state

Replace use of virtual functions

reference_wrapper

Internal formatted output to array descriptor

Delete dead code

Begin list-directed internal output

Refactorings and renamings for clarity

List-directed external I/O (character)

COMPLEX list-directed output

Control list items

First cut at unformatted I/O

More OPEN statement work; rename class to ExternalFileUnit

Complete OPEN (exc. for POSITION=), add CLOSE()

OPEN(POSITION=)

Flush buffers on crash and for terminal output; clean up

Documentation

Fix backquote in documentation

Fix typo in comment

Begin implementation of input

Refactor binary floating-point properties to a new header, simplify numeric output editing

Dodge spurious GCC 7.2 build warning

Address review comments

Original-commit: flang-compiler/f18@9c4bba11cf2329575ea9ee446f69e9caa797135c
Reviewed-on: https://github.com/flang-compiler/f18/pull/982

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[flang] Initial buffer framing code

Address review comments

Integer output data editing (I,B,O,Z)

Full integer output formatting

Stub out some work in progress

Progress on E output data editing

[flang] Initial buffer framing code

Address review comments

Integer output data editing (I,B,O,Z)

Full integer output formatting

Stub out some work in progress

Progress on E output data editing

E, D, EN, and ES output editing done

Fw.d output editing

Real G output editing

G output editing for reals

Make environment a distinct module

CHARACTER and LOGICAL output editing

Minimal decimal representations for E0, F0, G0 editing

Move real output editing code into its own file

Fix/dodge some GCC build problems

Prep work for external I/O statement state

External HELLO, WORLD

Fix build problem with GCC

Add virtual destructors where needed

Add new test

Original-commit: flang-compiler/f18@c3f1774f8eee903928b7e46636edfb03425eabc0
Reviewed-on: https://github.com/flang-compiler/f18/pull/950

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[flang] Changed *.cc file extension to *.cpp (updated scripts) (flang-compiler/f18#958)

Updated CMake files accordingly, using better regex
Updated license headers to match new extension and fit wi

[flang] Changed *.cc file extension to *.cpp (updated scripts) (flang-compiler/f18#958)

Updated CMake files accordingly, using better regex
Updated license headers to match new extension and fit within 80 columns
Updated other comments within files that referred to the old extension

Original-commit: flang-compiler/f18@ae7721e611918631d1e3821dbb60f5ffcd9a69b1
Reviewed-on: https://github.com/flang-compiler/f18/pull/958

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