Move librustc_hir/def_id.rs to librustc_span/def_id.rs

[rust.git] / src / librustc_span / lib.rs

diff --git a/src/librustc_span/lib.rs b/src/librustc_span/lib.rs
index 3f23eb15829de33d6a57744c6bfbafbaa55947d8..87342d6a301201998712e6863519445d426757e2 100644 (file)
--- a/src/librustc_span/lib.rs
+++ b/src/librustc_span/lib.rs
@@ -25,7 +25,8 @@
 pub mod hygiene;
 use hygiene::Transparency;
 pub use hygiene::{DesugaringKind, ExpnData, ExpnId, ExpnKind, MacroKind, SyntaxContext};
-
+pub mod def_id;
+use def_id::DefId;
 mod span_encoding;
 pub use span_encoding::{Span, DUMMY_SP};
 
@@ -445,23 +446,26 @@ pub fn allows_unsafe(&self) -> bool {
         self.ctxt().outer_expn_data().allow_internal_unsafe
     }
 
-    pub fn macro_backtrace(mut self) -> Vec<ExpnData> {
+    pub fn macro_backtrace(mut self) -> impl Iterator<Item = ExpnData> {
         let mut prev_span = DUMMY_SP;
-        let mut result = vec![];
-        loop {
-            let expn_data = self.ctxt().outer_expn_data();
-            if expn_data.is_root() {
-                break;
-            }
-            // Don't print recursive invocations.
-            if !expn_data.call_site.source_equal(&prev_span) {
-                result.push(expn_data.clone());
-            }
+        std::iter::from_fn(move || {
+            loop {
+                let expn_data = self.ctxt().outer_expn_data();
+                if expn_data.is_root() {
+                    return None;
+                }
 
-            prev_span = self;
-            self = expn_data.call_site;
-        }
-        result
+                let is_recursive = expn_data.call_site.source_equal(&prev_span);
+
+                prev_span = self;
+                self = expn_data.call_site;
+
+                // Don't print recursive invocations.
+                if !is_recursive {
+                    return Some(expn_data);
+                }
+            }
+        })
     }
 
     /// Returns a `Span` that would enclose both `self` and `end`.
@@ -1558,6 +1562,7 @@ fn lookup_line(lines: &[BytePos], pos: BytePos) -> isize {
 /// instead of implementing everything in librustc.
 pub trait HashStableContext {
     fn hash_spans(&self) -> bool;
+    fn hash_def_id(&mut self, _: DefId, hasher: &mut StableHasher);
     fn byte_pos_to_line_and_col(
         &mut self,
         byte: BytePos,