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howto_update_llvm.md

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How to update llir/llvm to support newer versions of LLVM

This document aims to describe the approach taken to update llir/llvm to support newer versions of the official LLVM release, as in, how to update from LLVM 8.0 to LLVM 9.0.

For now, we collect links to issues, PR and comments which describe the actions taken, and given example commits for adding new enums, updating the grammar, translating the AST to IR, updating the test cases, etc.

Test cases

To ensure llir/llvm is following the LLVM specification, we rely on the test cases of the official LLVM distribution. To update these test cases when a new version of LLVM is released, do as described in this comment of issue #105.

How to compare ASM update

$ wget https://github.com/llvm/llvm-project/archive/llvmorg-10.0.0.tar.gz
$ wget https://github.com/llvm/llvm-project/archive/llvmorg-11.0.0.tar.gz
$ tar zxf llvmorg-10.0.0.tar.gz
$ tar zxf llvmorg-11.0.0.tar.gz
$ git diff llvm-project-llvmorg-10.0.0/llvm/lib/AsmParser llvm-project-llvmorg-11.0.0/llvm/lib/AsmParser

API Mapping

c++ go(llir/llvm)
MDField Field
MDSignedOrMDField FieldOrInt
MDSignedField int64
APSIntField uint64
LineField int64
MDBoolField bool
MDStringField string
NameTableKindField enum.NameTableKind
DwarfTagField enum.DwarfTag