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Account for version number in NtIdent hack

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Issue #74616 tracks a backwards-compatibility hack for certain macros.
This has is implemented by hard-coding the filenames and macro names of
certain code that we want to continue to compile.

However, the initial implementation of the hack was based on the
directory structure when building the crate from its repository (e.g.
`js-sys/src/lib.rs`). When the crate is build as a dependency, it will
include a version number from the clone from the cargo registry (e.g.
`js-sys-0.3.17/src/lib.rs`), which would fail the check.

This commit modifies the backwards-compatibility hack to check that
desired crate name (`js-sys` or `time-macros-impl`) is a prefix of the
proper part of the path.

See https://github.com/rust-lang/rust/issues/76070#issuecomment-687215646
for more details.
This commit is contained in:
Aaron Hill 2020-09-04 13:10:23 -04:00
parent 80cacd7795
commit 9e7ef659e1
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GPG key ID: B4087E510E98B164
5 changed files with 57 additions and 11 deletions
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16
compiler/rustc_ast/src/token.rs
View file

@ -809,9 +809,19 @@ impl Nonterminal {
if let ExpnKind::Macro(_, macro_name) = orig_span.ctxt().outer_expn_data().kind {
let filename = source_map.span_to_filename(orig_span);
if let FileName::Real(RealFileName::Named(path)) = filename {
if (path.ends_with("time-macros-impl/src/lib.rs")
&& macro_name == sym::impl_macros)
|| (path.ends_with("js-sys/src/lib.rs") && macro_name == sym::arrays)
let matches_prefix = |prefix| {
// Check for a path that ends with 'prefix*/src/lib.rs'
let mut iter = path.components().rev();
iter.next().and_then(|p| p.as_os_str().to_str()) == Some("lib.rs")
&& iter.next().and_then(|p| p.as_os_str().to_str()) == Some("src")
&& iter
.next()
.and_then(|p| p.as_os_str().to_str())
.map_or(false, |p| p.starts_with(prefix))
};
if (macro_name == sym::impl_macros && matches_prefix("time-macros-impl"))
|| (macro_name == sym::arrays && matches_prefix("js-sys"))
{
let snippet = source_map.span_to_snippet(orig_span);
if snippet.as_deref() == Ok("$name") {