Rust: Fix various bad joins

rust/ql/lib/codeql/rust/internal/PathResolution.qll

@@ -607,6 +607,9 @@ class ImplItemNode extends ImplOrTraitItemNode instanceof Impl {
     result = this.resolveTraitTy().getCanonicalPath(c)
   }
 
+  pragma[nomagic]
+  private string getSelfCanonicalPath(Crate c) { result = this.resolveSelfTy().getCanonicalPath(c) }
+
   pragma[nomagic]
   private string getCanonicalPathTraitPart(Crate c) {
     exists(Crate c2 |
@@ -621,7 +624,7 @@ class ImplItemNode extends ImplOrTraitItemNode instanceof Impl {
     result = "<"
     or
     i = 1 and
-    result = this.resolveSelfTy().getCanonicalPath(c)
+    result = this.getSelfCanonicalPath(c)
     or
     if exists(this.getTraitPath())
     then
@@ -985,6 +988,7 @@ private predicate sourceFileEdge(SourceFile f, string name, ItemNode item) {
 }
 
 /** Holds if `f` is available as `mod name;` inside `folder`. */
+pragma[nomagic]
 private predicate fileModule(SourceFile f, string name, Folder folder) {
   exists(File file | file = f.getFile() |
     file.getBaseName() = name + ".rs" and
@@ -999,6 +1003,12 @@ private predicate fileModule(SourceFile f, string name, Folder folder) {
   )
 }
 
+bindingset[name, folder]
+pragma[inline_late]
+private predicate fileModuleInlineLate(SourceFile f, string name, Folder folder) {
+  fileModule(f, name, folder)
+}
+
 /**
  * Gets the `Meta` of the module `m`'s [path attribute][1].
  *
@@ -1081,7 +1091,7 @@ pragma[nomagic]
 predicate fileImport(Module m, SourceFile f) {
   exists(string name, Folder parent |
     modImport0(m, name, _) and
-    fileModule(f, name, parent)
+    fileModuleInlineLate(f, name, parent)
   |
     // `m` is not inside a nested module
     modImport0(m, name, parent) and

shared/typeinference/codeql/typeinference/internal/TypeInference.qll

@@ -423,27 +423,23 @@ module Make1<LocationSig Location, InputSig1<Location> Input1> {
           )
       }
 
-      /**
-       * Holds if `app` is a possible instantiation of `tm` at `path`. That is
-       * the type at `path` in `tm` is either a type parameter or equal to the
-       * type at the same path in `app`.
-       */
-      bindingset[app, abs, tm, path]
-      private predicate satisfiesConcreteTypeAt(
-        App app, TypeAbstraction abs, TypeMention tm, TypePath path
+      pragma[nomagic]
+      private Type resolveNthTypeAt(
+        App app, TypeAbstraction abs, TypeMention tm, int i, TypePath path
       ) {
-        exists(Type t |
-          tm.resolveTypeAt(path) = t and
-          if t = abs.getATypeParameter() then any() else app.getTypeAt(path) = t
-        )
+        potentialInstantiationOf(app, abs, tm) and
+        path = getNthPath(tm, i) and
+        result = tm.resolveTypeAt(path)
       }
 
       pragma[nomagic]
       private predicate satisfiesConcreteTypesFromIndex(
         App app, TypeAbstraction abs, TypeMention tm, int i
       ) {
-        potentialInstantiationOf(app, abs, tm) and
-        satisfiesConcreteTypeAt(app, abs, tm, getNthPath(tm, i)) and
+        exists(Type t, TypePath path |
+          t = resolveNthTypeAt(app, abs, tm, i, path) and
+          if t = abs.getATypeParameter() then any() else app.getTypeAt(path) = t
+        ) and
         // Recurse unless we are at the first path
         if i = 0 then any() else satisfiesConcreteTypesFromIndex(app, abs, tm, i - 1)
       }
@@ -467,24 +463,34 @@ module Make1<LocationSig Location, InputSig1<Location> Input1> {
        * Gets the path to the `i`th occurrence of `tp` within `tm` per some
        * arbitrary order, if any.
        */
+      pragma[nomagic]
       private TypePath getNthTypeParameterPath(TypeMention tm, TypeParameter tp, int i) {
         result =
           rank[i + 1](TypePath path | tp = tm.resolveTypeAt(path) and relevantTypeMention(tm) | path)
       }
 
+      pragma[nomagic]
+      private predicate typeParametersEqualFromIndexBase(
+        App app, TypeAbstraction abs, TypeMention tm, TypeParameter tp, TypePath path
+      ) {
+        path = getNthTypeParameterPath(tm, tp, 0) and
+        satisfiesConcreteTypes(app, abs, tm) and
+        // no need to compute this predicate if there is only one path
+        exists(getNthTypeParameterPath(tm, tp, 1))
+      }
+
       pragma[nomagic]
       private predicate typeParametersEqualFromIndex(
         App app, TypeAbstraction abs, TypeMention tm, TypeParameter tp, Type t, int i
       ) {
-        satisfiesConcreteTypes(app, abs, tm) and
         exists(TypePath path |
-          path = getNthTypeParameterPath(tm, tp, i) and
           t = app.getTypeAt(path) and
           if i = 0
-          then
-            // no need to compute this predicate if there is only one path
-            exists(getNthTypeParameterPath(tm, tp, 1))
-          else typeParametersEqualFromIndex(app, abs, tm, tp, t, i - 1)
+          then typeParametersEqualFromIndexBase(app, abs, tm, tp, path)
+          else (
+            typeParametersEqualFromIndex(app, abs, tm, tp, t, i - 1) and
+            path = getNthTypeParameterPath(tm, tp, i)
+          )
         )
       }
 
@@ -1040,6 +1046,7 @@ module Make1<LocationSig Location, InputSig1<Location> Input1> {
         /**
          * Holds if `at` satisfies `constraint` through `abs`, `sub`, and `constraintMention`.
          */
+        pragma[nomagic]
         private predicate hasConstraintMention(
           RelevantAccess at, TypeAbstraction abs, TypeMention sub, Type constraint,
           TypeMention constraintMention
@@ -1063,6 +1070,30 @@ module Make1<LocationSig Location, InputSig1<Location> Input1> {
           )
         }
 
+        pragma[nomagic]
+        predicate satisfiesConstraintTypeMention0(
+          RelevantAccess at, Access a, AccessPosition apos, TypePath prefix, Type constraint,
+          TypeAbstraction abs, TypeMention sub, TypePath path, Type t
+        ) {
+          exists(TypeMention constraintMention |
+            at = MkRelevantAccess(a, apos, prefix) and
+            hasConstraintMention(at, abs, sub, constraint, constraintMention) and
+            conditionSatisfiesConstraintTypeAt(abs, sub, constraintMention, path, t)
+          )
+        }
+
+        pragma[nomagic]
+        predicate satisfiesConstraintTypeMention1(
+          RelevantAccess at, Access a, AccessPosition apos, TypePath prefix, Type constraint,
+          TypePath path, TypePath pathToTypeParamInSub
+        ) {
+          exists(TypeAbstraction abs, TypeMention sub, TypeParameter tp |
+            satisfiesConstraintTypeMention0(at, a, apos, prefix, constraint, abs, sub, path, tp) and
+            tp = abs.getATypeParameter() and
+            sub.resolveTypeAt(pathToTypeParamInSub) = tp
+          )
+        }
+
         /**
          * Holds if the type at `a`, `apos`, and `path` satisfies the constraint
          * `constraint` with the type `t` at `path`.
@@ -1071,22 +1102,18 @@ module Make1<LocationSig Location, InputSig1<Location> Input1> {
         predicate satisfiesConstraintTypeMention(
           Access a, AccessPosition apos, TypePath prefix, Type constraint, TypePath path, Type t
         ) {
+          exists(TypeAbstraction abs |
+            satisfiesConstraintTypeMention0(_, a, apos, prefix, constraint, abs, _, path, t) and
+            not t = abs.getATypeParameter()
+          )
+          or
           exists(
-            RelevantAccess at, TypeAbstraction abs, TypeMention sub, Type t0, TypePath prefix0,
-            TypeMention constraintMention
+            RelevantAccess at, TypePath prefix0, TypePath pathToTypeParamInSub, TypePath suffix
           |
-            at = MkRelevantAccess(a, apos, prefix) and
-            hasConstraintMention(at, abs, sub, constraint, constraintMention) and
-            conditionSatisfiesConstraintTypeAt(abs, sub, constraintMention, prefix0, t0)
-          |
-            not t0 = abs.getATypeParameter() and t = t0 and path = prefix0
-            or
-            t0 = abs.getATypeParameter() and
-            exists(TypePath path3, TypePath suffix |
-              sub.resolveTypeAt(path3) = t0 and
-              at.getTypeAt(path3.appendInverse(suffix)) = t and
-              path = prefix0.append(suffix)
-            )
+            satisfiesConstraintTypeMention1(at, a, apos, prefix, constraint, prefix0,
+              pathToTypeParamInSub) and
+            at.getTypeAt(pathToTypeParamInSub.appendInverse(suffix)) = t and
+            path = prefix0.append(suffix)
           )
         }
       }
@@ -1289,14 +1316,14 @@ module Make1<LocationSig Location, InputSig1<Location> Input1> {
         exists(DeclarationPosition dpos | accessDeclarationPositionMatch(apos, dpos) |
           // A suffix of `path` leads to a type parameter in the target
           exists(Declaration target, TypePath prefix, TypeParameter tp, TypePath suffix |
-            tp = target.getDeclaredType(pragma[only_bind_into](dpos), prefix) and
+            tp = target.getDeclaredType(dpos, prefix) and
             path = prefix.append(suffix) and
             typeMatch(a, target, suffix, result, tp)
           )
           or
           // `path` corresponds directly to a concrete type in the declaration
           exists(Declaration target |
-            result = target.getDeclaredType(pragma[only_bind_into](dpos), path) and
+            result = target.getDeclaredType(dpos, path) and
             target = a.getTarget() and
             not result instanceof TypeParameter
           )