tree b9e10c1efbf4ceaec6cc8c68929b0d7c516b581c
parent 60d3e68e98d01cffa54ecedf605ccaaea0ecebe6
author Fangrui Song <i@maskray.me> 1705943386 -0800
committer Copybara-Service <copybara-worker@google.com> 1705943447 -0800

[ELF] Add internal InputFile (#78944)

Based on https://reviews.llvm.org/D45375 . Introduce a new InputFile
kind `InternalKind`, use it for

* `ctx.internalFile`: for linker-defined symbols and some synthesized
`Undefined`
* `createInternalFile`: for symbol assignments and --defsym

I picked "internal" instead of "synthetic" to avoid confusion with
SyntheticSection.

Currently a symbol's file is one of: nullptr, ObjKind, SharedKind,
BitcodeKind, BinaryKind. Now it's non-null (I plan to add an
`assert(file)` to Symbol::Symbol and change `toString(const InputFile
*)`
separately).

Debugging and error reporting gets improved. The immediate user-facing
difference is more descriptive "File" column in the --cref output. This
patch may unlock further simplification.

Currently each symbol assignment gets its own
`createInternalFile(cmd->location)`. Two symbol assignments in a linker
script do not share the same file. Making the file the same would be
nice, but would require non trivial code.

GitOrigin-RevId: 43b13341fbbb718223484a79a539a3c13062f39f