Add all_trait_decls to SMIR

Author: spastorino

Diff for: compiler/rustc_smir/src/rustc_smir/mod.rs

@@ -42,6 +42,14 @@ impl<'tcx> Context for Tables<'tcx> {
         Some(self.crate_item(self.tcx.entry_fn(())?.0))
     }
 
+    fn all_trait_decls(&mut self) -> stable_mir::TraitDecls {
+        self.tcx
+            .traits(LOCAL_CRATE)
+            .iter()
+            .map(|trait_def_id| self.trait_def(*trait_def_id))
+            .collect()
+    }
+
     fn trait_decl(&mut self, trait_def: &stable_mir::ty::TraitDef) -> stable_mir::ty::TraitDecl {
         let def_id = self.trait_def_id(trait_def);
         let trait_def = self.tcx.trait_def(def_id);

Diff for: compiler/rustc_smir/src/stable_mir/mod.rs

@@ -32,6 +32,9 @@ pub type DefId = usize;
 /// A list of crate items.
 pub type CrateItems = Vec<CrateItem>;
 
+/// A list of crate items.
+pub type TraitDecls = Vec<TraitDef>;
+
 /// Holds information about a crate.
 #[derive(Clone, PartialEq, Eq, Debug)]
 pub struct Crate {
@@ -84,6 +87,7 @@ pub trait Context {
     /// Retrieve all items of the local crate that have a MIR associated with them.
     fn all_local_items(&mut self) -> CrateItems;
     fn mir_body(&mut self, item: &CrateItem) -> mir::Body;
+    fn all_trait_decls(&mut self) -> TraitDecls;
     fn trait_decl(&mut self, trait_def: &TraitDef) -> TraitDecl;
     /// Get information about the local crate.
     fn local_crate(&self) -> Crate;