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Auto merge of #31279 - DanielJCampbell:MacroReferencing, r=nrc

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r? @nrc
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bors 2016-02-02 01:35:39 +00:00
commit a4a249fcab
10 changed files with 221 additions and 11 deletions
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21
src/libsyntax/codemap.rs
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@ -1064,6 +1064,27 @@ impl CodeMap {
span
}
/// Return the source callee.
///
/// Returns None if the supplied span has no expansion trace,
/// else returns the NameAndSpan for the macro definition
/// corresponding to the source callsite.
pub fn source_callee(&self, sp: Span) -> Option<NameAndSpan> {
let mut span = sp;
while let Some(callsite) = self.with_expn_info(span.expn_id,
|ei| ei.map(|ei| ei.call_site.clone())) {
if let Some(_) = self.with_expn_info(callsite.expn_id,
|ei| ei.map(|ei| ei.call_site.clone())) {
span = callsite;
}
else {
return self.with_expn_info(span.expn_id,
|ei| ei.map(|ei| ei.callee.clone()));
}
}
None
}
pub fn span_to_filename(&self, sp: Span) -> FileName {
self.lookup_char_pos(sp.lo).file.name.to_string()
}