[PATCH] D113460: [llvm-dwarfdump] Add support for filtering by DIE tags

[William Woodruff via Phabricator via llvm-commits]

woodruffw added a comment.

In D113460#3117451 <https://reviews.llvm.org/D113460#3117451>, @dblaikie wrote:

> Any particular motivation/need for this?

Yep. I work on a source and binary static analysis system that includes a DWARF information component. Our input programs can be extremely large (we effectively do LTO to bring everything into a single `llvm::Module`) and sometimes contain hundreds of identically named local variables, globals, formal parameters, etc. When debugging the DWARF information that LLVM emits, we use `llvm-objdump` to filter down to the problematic DIEs. But this can still leave hundreds of DIEs, particularly when the problematic name is something generic like `len`. Having the `--tag`  option would allow us to additionally filter by the tag we're interested in, e.g. including only `DW_TAG_formal_parameter`s that match `DW_TAG_name=len`.


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