Use a constructor function per dep node instead of an enum and a single function

src/librustc/dep_graph/dep_node.rs

@@ -76,10 +76,6 @@ macro_rules! erase {
     ($x:tt) => {{}};
 }
 
-macro_rules! replace {
-    ($x:tt with $($y:tt)*) => ($($y)*)
-}
-
 macro_rules! is_anon_attr {
     (anon) => {
         true
@@ -175,10 +171,43 @@ macro_rules! define_dep_nodes {
             }
         }
 
-        pub enum DepConstructor<$tcx> {
+        pub struct DepConstructor;
+
+        impl DepConstructor {
             $(
-                $variant $(( $tuple_arg_ty ))*
-            ),*
+                #[inline(always)]
+                #[allow(unreachable_code, non_snake_case)]
+                pub fn $variant<'tcx>(_tcx: TyCtxt<'tcx>, $(arg: $tuple_arg_ty)*) -> DepNode {
+                    // tuple args
+                    $({
+                        erase!($tuple_arg_ty);
+                        let hash = DepNodeParams::to_fingerprint(&arg, _tcx);
+                        let dep_node = DepNode {
+                            kind: DepKind::$variant,
+                            hash
+                        };
+
+                        #[cfg(debug_assertions)]
+                        {
+                            if !dep_node.kind.can_reconstruct_query_key() &&
+                            (_tcx.sess.opts.debugging_opts.incremental_info ||
+                                _tcx.sess.opts.debugging_opts.query_dep_graph)
+                            {
+                                _tcx.dep_graph.register_dep_node_debug_str(dep_node, || {
+                                    arg.to_debug_str(_tcx)
+                                });
+                            }
+                        }
+
+                        return dep_node;
+                    })*
+
+                    DepNode {
+                        kind: DepKind::$variant,
+                        hash: Fingerprint::ZERO,
+                    }
+                }
+            )*
         }
 
         #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash,
@@ -189,49 +218,6 @@ macro_rules! define_dep_nodes {
         }
 
         impl DepNode {
-            #[allow(unreachable_code, non_snake_case)]
-            pub fn new<'tcx>(tcx: TyCtxt<'tcx>,
-                                       dep: DepConstructor<'tcx>)
-                                       -> DepNode
-            {
-                match dep {
-                    $(
-                        DepConstructor :: $variant $(( replace!(($tuple_arg_ty) with arg) ))*
-                            =>
-                        {
-                            // tuple args
-                            $({
-                                erase!($tuple_arg_ty);
-                                let hash = DepNodeParams::to_fingerprint(&arg, tcx);
-                                let dep_node = DepNode {
-                                    kind: DepKind::$variant,
-                                    hash
-                                };
-
-                                #[cfg(debug_assertions)]
-                                {
-                                    if !dep_node.kind.can_reconstruct_query_key() &&
-                                    (tcx.sess.opts.debugging_opts.incremental_info ||
-                                        tcx.sess.opts.debugging_opts.query_dep_graph)
-                                    {
-                                        tcx.dep_graph.register_dep_node_debug_str(dep_node, || {
-                                            arg.to_debug_str(tcx)
-                                        });
-                                    }
-                                }
-
-                                return dep_node;
-                            })*
-
-                            DepNode {
-                                kind: DepKind::$variant,
-                                hash: Fingerprint::ZERO,
-                            }
-                        }
-                    )*
-                }
-            }
-
             /// Construct a DepNode from the given DepKind and DefPathHash. This
             /// method will assert that the given DepKind actually requires a
             /// single DefId/DefPathHash parameter.

src/librustc/mir/mono.rs

@@ -362,7 +362,7 @@ impl<'tcx> CodegenUnit<'tcx> {
     }
 
     pub fn codegen_dep_node(&self, tcx: TyCtxt<'tcx>) -> DepNode {
-        DepNode::new(tcx, DepConstructor::CompileCodegenUnit(self.name()))
+        DepConstructor::CompileCodegenUnit(tcx, self.name())
     }
 }
 

src/librustc/ty/context.rs

@@ -2,7 +2,7 @@
 
 use crate::arena::Arena;
 use crate::dep_graph::DepGraph;
-use crate::dep_graph::{self, DepConstructor, DepNode};
+use crate::dep_graph::{self, DepConstructor};
 use crate::hir::exports::Export;
 use crate::hir::map as hir_map;
 use crate::hir::map::DefPathHash;
@@ -1347,7 +1347,7 @@ impl<'tcx> TyCtxt<'tcx> {
         // We cannot use the query versions of crates() and crate_hash(), since
         // those would need the DepNodes that we are allocating here.
         for cnum in self.cstore.crates_untracked() {
-            let dep_node = DepNode::new(self, DepConstructor::CrateMetadata(cnum));
+            let dep_node = DepConstructor::CrateMetadata(self, cnum);
             let crate_hash = self.cstore.crate_hash_untracked(cnum);
             self.dep_graph.with_task(
                 dep_node,

src/librustc/ty/query/mod.rs

@@ -1,4 +1,4 @@
-use crate::dep_graph::{self, DepNode};
+use crate::dep_graph::{self, DepConstructor, DepNode};
 use crate::hir::exports::Export;
 use crate::infer::canonical::{self, Canonical};
 use crate::lint::LintLevelMap;

src/librustc/ty/query/plumbing.rs

@@ -987,9 +987,7 @@ macro_rules! define_queries_inner {
             #[allow(unused)]
             #[inline(always)]
             fn to_dep_node(tcx: TyCtxt<$tcx>, key: &Self::Key) -> DepNode {
-                use crate::dep_graph::DepConstructor::*;
-
-                DepNode::new(tcx, $node(*key))
+                DepConstructor::$node(tcx, *key)
             }
 
             #[inline(always)]