[llvm-ml] Remove all file extension restrictions

After D126425 was submitted, hans@ observed that MSVC's ml.exe doesn't
care about the file's extension at all. Now, we check if the file exists
to de

[llvm-ml] Remove all file extension restrictions

After D126425 was submitted, hans@ observed that MSVC's ml.exe doesn't
care about the file's extension at all. Now, we check if the file exists
to determine whether an input filename is a valid assembly file.

To keep things consistent with clang-cl and lld-link, llvm-ml will treat
everything that's not a flag as a filename.

Reviewed By: hans

Differential Revision: https://reviews.llvm.org/D126931

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Add the /nologo flag to llvm-ml

This flag is present in MSVC's ml.exe to suppress copyright info output.
LLVM doesn't output copyright info, so this flag does nothing in
llvm-ml. We still add this f

Add the /nologo flag to llvm-ml

This flag is present in MSVC's ml.exe to suppress copyright info output.
LLVM doesn't output copyright info, so this flag does nothing in
llvm-ml. We still add this flag though so that when llvm-ml is used as a
drop-in replacement for MSVC ml.exe, we don't get any extra warnings.
Furthermore, this behavior is also consistent with other llvm binaries
for Windows (e.g. clang-cl, llvm-mt, lld-link, etc.)

Differential revision: https://reviews.llvm.org/D123068

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[test] Use host platform specific error message substitution in lit tests

On z/OS, the following error message is not matched correctly in lit tests.

```
EDC5129I No such file or directory.
```

Th

[test] Use host platform specific error message substitution in lit tests

On z/OS, the following error message is not matched correctly in lit tests.

```
EDC5129I No such file or directory.
```

This patch uses a lit config substitution to check for platform specific error messages.

Reviewed By: muiez, jhenderson

Differential Revision: https://reviews.llvm.org/D95246

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Revert "[SystemZ][z/OS] Fix No such file or directory expression error"

This reverts commit 06f8a49693957bc27b83e0ab5f429ff874941a07.

[SystemZ][z/OS] Fix No such file or directory expression error matching in lit tests

On z/OS, the following error message is not matched correctly in lit tests. This patch updates the CHECK expressi

[SystemZ][z/OS] Fix No such file or directory expression error matching in lit tests

On z/OS, the following error message is not matched correctly in lit tests. This patch updates the CHECK expression to match successfully.
```
EDC5129I No such file or directory.
```

Reviewed By: muiez

Differential Revision: https://reviews.llvm.org/D94239

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[ms] [llvm-ml] Introduce command-line compatibility for ml.exe and ml64.exe

Switch to OptParser for command-line handling

Reviewed By: thakis

Differential Revision: https://reviews.llvm.org/D90058

[ms] [llvm-ml] Add a draft MASM parser

Summary:
Many directives are unavailable, and support for others may be limited.

This first draft has preliminary support for:
- conditional directives (i

[ms] [llvm-ml] Add a draft MASM parser

Summary:
Many directives are unavailable, and support for others may be limited.

This first draft has preliminary support for:
- conditional directives (including errors),
- data allocation (unsigned types up to 8 bytes, and ALIGN),
- equates/variables (numeric and text),
- and procedure directives (without parameters),
as well as COMMENT, ECHO, INCLUDE, INCLUDELIB, PUBLIC, and EXTERN. Text variables (aka text macros) are expanded in-place wherever the identifier occurs.

We deliberately ignore all ml.exe processor directives.

Prominent features not yet supported:
- structs
- macros (both procedures and functions)
- procedures (with specified parameters)
- substitution & expansion operators

Conditional directives are complicated by the fact that "ifdef rax" is a valid way to check if a file is being assembled for a 64-bit x86 processor; we add support for "ifdef <register>" in general, which requires adding a tryParseRegister method to all MCTargetAsmParsers. (Some targets require backtracking in the non-register case.)

Reviewers: rnk, thakis

Reviewed By: thakis

Subscribers: kerbowa, merge_guards_bot, wuzish, arsenm, dschuff, jyknight, dylanmckay, sdardis, nemanjai, jvesely, mgorny, sbc100, jgravelle-google, hiraditya, aheejin, kbarton, fedor.sergeev, asb, rbar, johnrusso, simoncook, sabuasal, niosHD, jrtc27, MaskRay, zzheng, edward-jones, atanasyan, rogfer01, MartinMosbeck, brucehoult, the_o, PkmX, jocewei, jsji, Jim, s.egerton, pzheng, sameer.abuasal, apazos, luismarques, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D72680

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[ms] [llvm-ml] Add placeholder for llvm-ml, based on llvm-mc

As discussed on the mailing list, I plan to introduce an ml-compatible MASM assembler as part of providing more of the Windows build tool

[ms] [llvm-ml] Add placeholder for llvm-ml, based on llvm-mc

As discussed on the mailing list, I plan to introduce an ml-compatible MASM assembler as part of providing more of the Windows build tools. This will be similar to llvm-mc, but with different command-line parameters.

This placeholder is purely a stripped-down version of llvm-mc; we'll eventually add support for the Microsoft-style command-line flags, and back it with a MASM parser.

Relanding this revision after fixing ARM-compatibility issues.

Reviewers: rnk, thakis, RKSimon

Reviewed By: thakis, RKSimon

Differential Revision: https://reviews.llvm.org/D72679

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[ms] [llvm-ml] Add placeholder for llvm-ml, based on llvm-mc

Summary:
As discussed on the mailing list, I plan to introduce an ml-compatible MASM assembler as part of providing more of the Windows b

[ms] [llvm-ml] Add placeholder for llvm-ml, based on llvm-mc

Summary:
As discussed on the mailing list, I plan to introduce an ml-compatible MASM assembler as part of providing more of the Windows build tools. This will be similar to llvm-mc, but with different command-line parameters.

This placeholder is purely a stripped-down version of llvm-mc; we'll eventually add support for the Microsoft-style command-line flags, and back it with a MASM parser.

Reviewers: rnk, thakis

Reviewed By: thakis

Subscribers: merge_guards_bot, mgorny, jfb, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D72679

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