[PATCH] D72680: [ms] [llvm-ml] Add a draft MASM parser

[Eric Astor via Phabricator via llvm-commits]

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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.

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.)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D72680

Files:
  llvm/include/llvm/MC/MCAsmInfo.h
  llvm/include/llvm/MC/MCParser/AsmLexer.h
  llvm/include/llvm/MC/MCParser/MCAsmParser.h
  llvm/include/llvm/MC/MCParser/MCTargetAsmParser.h
  llvm/include/llvm/MC/MCStreamer.h
  llvm/lib/MC/MCAsmInfoCOFF.cpp
  llvm/lib/MC/MCParser/AsmLexer.cpp
  llvm/lib/MC/MCParser/AsmParser.cpp
  llvm/lib/MC/MCParser/CMakeLists.txt
  llvm/lib/MC/MCParser/COFFMasmParser.cpp
  llvm/lib/MC/MCParser/MCAsmParser.cpp
  llvm/lib/MC/MCParser/MasmParser.cpp
  llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
  llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp
  llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
  llvm/lib/Target/AVR/AsmParser/AVRAsmParser.cpp
  llvm/lib/Target/BPF/AsmParser/BPFAsmParser.cpp
  llvm/lib/Target/Hexagon/AsmParser/HexagonAsmParser.cpp
  llvm/lib/Target/Lanai/AsmParser/LanaiAsmParser.cpp
  llvm/lib/Target/MSP430/AsmParser/MSP430AsmParser.cpp
  llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
  llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp
  llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
  llvm/lib/Target/Sparc/AsmParser/SparcAsmParser.cpp
  llvm/lib/Target/SystemZ/AsmParser/SystemZAsmParser.cpp
  llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
  llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
  llvm/tools/llvm-ml/llvm-ml.cpp
  llvm/utils/gn/secondary/llvm/lib/MC/MCParser/BUILD.gn

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