incr.comp.: Make DefSpan an input dep-node so it is not affected by the existing Span/HIR hashing hack.

Author: michaelwoerister

src/librustc/dep_graph/dep_node.rs

@@ -568,7 +568,13 @@ define_dep_nodes!( <'tcx>
 
     [] ParamEnv(DefId),
     [] DescribeDef(DefId),
-    [] DefSpan(DefId),
+
+    // FIXME(mw): DefSpans are not really inputs since they are derived from
+    // HIR. But at the moment HIR hashing still contains some hacks that allow
+    // to make type debuginfo to be source location independent. Declaring
+    // DefSpan an input makes sure that changes to these are always detected
+    // regardless of HIR hashing.
+    [input] DefSpan(DefId),
     [] LookupStability(DefId),
     [] LookupDeprecationEntry(DefId),
     [] ItemBodyNestedBodies(DefId),

src/librustc/dep_graph/graph.rs

@@ -789,6 +789,9 @@ impl CurrentDepGraph {
             // node.
             if cfg!(debug_assertions) {
                 if node.kind.is_input() && reads.len() > 0 &&
+                   // FIXME(mw): Special case for DefSpan until Spans are handled
+                   //            better in general.
+                   node.kind != DepKind::DefSpan &&
                     reads.iter().any(|&i| {
                         !(self.nodes[i].kind == DepKind::CrateMetadata ||
                           self.nodes[i].kind == DepKind::Krate)

src/test/incremental/remove_source_file/main.rs

@@ -11,21 +11,24 @@
 // This test case makes sure that the compiler doesn't crash due to a failing
 // table lookup when a source file is removed.
 
-// revisions:rpass1 rpass2
+// revisions:cfail1 cfail2
 
 // Note that we specify -g so that the FileMaps actually get referenced by the
 // incr. comp. cache:
 // compile-flags: -Z query-dep-graph -g
+// must-compile-successfully
 
-#[cfg(rpass1)]
+#![crate_type= "rlib"]
+
+#[cfg(cfail1)]
 mod auxiliary;
 
-#[cfg(rpass1)]
-fn main() {
+#[cfg(cfail1)]
+pub fn foo() {
     auxiliary::print_hello();
 }
 
-#[cfg(rpass2)]
-fn main() {
+#[cfg(cfail2)]
+pub fn foo() {
     println!("hello");
 }

src/test/incremental/spans_in_type_debuginfo.rs

@@ -14,7 +14,6 @@
 // revisions:rpass1 rpass2
 // compile-flags: -Z query-dep-graph -g
 
-#![rustc_partition_reused(module="spans_in_type_debuginfo", cfg="rpass2")]
 #![rustc_partition_reused(module="spans_in_type_debuginfo-structs", cfg="rpass2")]
 #![rustc_partition_reused(module="spans_in_type_debuginfo-enums", cfg="rpass2")]