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ssa: implement #[collapse_debuginfo]

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Debuginfo line information for macro invocations are collapsed by
default - line information are replaced by the line of the outermost
expansion site. Using `-Zdebug-macros` disables this behaviour.

When the `collapse_debuginfo` feature is enabled, the default behaviour
is reversed so that debuginfo is not collapsed by default. In addition,
the `#[collapse_debuginfo]` attribute is available and can be applied to
macro definitions which will then have their line information collapsed.

Signed-off-by: David Wood <david.wood@huawei.com>
This commit is contained in:
David Wood 2022-07-21 16:19:22 +01:00
parent 2991a7c715
commit 38958aa8bd
20 changed files with 699 additions and 35 deletions
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7
compiler/rustc_span/src/lib.rs
View file

@ -564,6 +564,13 @@ impl Span {
self.ctxt() != SyntaxContext::root()
}
/// Returns `true` if `span` originates in a macro's expansion where debuginfo should be
/// collapsed.
pub fn in_macro_expansion_with_collapse_debuginfo(self) -> bool {
let outer_expn = self.ctxt().outer_expn_data();
matches!(outer_expn.kind, ExpnKind::Macro(..)) && outer_expn.collapse_debuginfo
}
/// Returns `true` if `span` originates in a derive-macro's expansion.
pub fn in_derive_expansion(self) -> bool {
matches!(self.ctxt().outer_expn_data().kind, ExpnKind::Macro(MacroKind::Derive, _))