[all-commits] [llvm/llvm-project] 1721c1: [DebugInfo] Add DW_OP_LLVM_extract_bits (#93990)

[John Brawn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1721c14e8e0d75cc611067b6f4e84028ea7c47d5
      https://github.com/llvm/llvm-project/commit/1721c14e8e0d75cc611067b6f4e84028ea7c47d5
  Author: John Brawn <john.brawn at arm.com>
  Date:   2024-06-07 (Fri, 07 Jun 2024)

  Changed paths:
    M llvm/docs/LangRef.rst
    M llvm/include/llvm/BinaryFormat/Dwarf.h
    M llvm/lib/BinaryFormat/Dwarf.cpp
    M llvm/lib/CodeGen/AsmPrinter/DwarfExpression.cpp
    M llvm/lib/IR/DebugInfoMetadata.cpp
    A llvm/test/DebugInfo/X86/DW_OP_LLVM_extract_bits.ll

  Log Message:
  -----------
  [DebugInfo] Add DW_OP_LLVM_extract_bits (#93990)

This operation extracts a number of bits at a given offset and sign or
zero extends them, which is done by emitting it as a left shift followed
by a right shift.

This is being added for use in clang for C++ structured bindings of
bitfields that have offset or size that aren't a byte multiple. A new
operation is being added, instead of shifts being used directly, as it
makes correctly handling it in optimisations (which will be done in a
later patch) much easier.



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