tree 8b624aae214dbeda41117f612d7f8056dfb7b61d
parent 39188b455e622955a94a4a60991e4f60d923e133
author Fangrui Song <i@maskray.me> 1709774399 -0800
committer Copybara-Service <copybara-worker@google.com> 1709775924 -0800

[ELF] Reject error-prone meta characters in input section description

The lexer is overly permissive. When parsing file patterns in an input
section description and there is a missing `)`, we would accept many
non-sensible tokens (e.g. `}`) as patterns, leading to confusion, e.g.
`*(SORT_BY_ALIGNMENT(SORT_BY_NAME(.text*)) } PROVIDE_HIDDEN(__code_end = .)`
(#81804).

Ideally, the lexer should be stateful to report more errors like GNU ld
and get rid of hacks like `ScriptLexer::maybeSplitExpr`, but that would
require a large rewrite of the lexer. For now, just reject certain
non-wildcard meta characters to detect common mistakes.

Pull Request: https://github.com/llvm/llvm-project/pull/84130

GitOrigin-RevId: 551e20d190868fe47f8efbfd1dbf38191cc2c95d