Merge pull request github#18290 from hvitved/rust/perf-fixes

Rust: Fix two bad joins

Author: hvitved

rust/ql/lib/codeql/rust/dataflow/internal/DataFlowImpl.qll

@@ -957,8 +957,8 @@ module RustDataFlow implements InputSig<Location> {
   /** Holds if path `p` resolves to variant `v`. */
   private predicate pathResolveToVariantCanonicalPath(PathAstNode p, VariantCanonicalPath v) {
     exists(CrateOriginOption crate, string path, string name |
-      resolveExtendedCanonicalPath(p, crate, path + "::" + name) and
-      v = MkVariantCanonicalPath(crate, path, name)
+      resolveExtendedCanonicalPath(p, pragma[only_bind_into](crate), path + "::" + name) and
+      v = MkVariantCanonicalPath(pragma[only_bind_into](crate), path, name)
     )
   }
 
@@ -1074,57 +1074,59 @@ module RustDataFlow implements InputSig<Location> {
     )
   }
 
+  pragma[nomagic]
+  private predicate storeContentStep(Node node1, Content c, Node node2) {
+    exists(CallExprCfgNode call, int pos |
+      tupleVariantConstruction(call.getCallExpr(),
+        c.(VariantPositionContent).getVariantCanonicalPath(pos)) and
+      node1.asExpr() = call.getArgument(pos) and
+      node2.asExpr() = call
+    )
+    or
+    exists(RecordExprCfgNode re, string field |
+      (
+        // Expression is for a struct-like enum variant.
+        recordVariantConstruction(re.getRecordExpr(),
+          c.(VariantFieldContent).getVariantCanonicalPath(field))
+        or
+        // Expression is for a struct.
+        structConstruction(re.getRecordExpr(), c.(StructFieldContent).getStructCanonicalPath(field))
+      ) and
+      node1.asExpr() = re.getFieldExpr(field) and
+      node2.asExpr() = re
+    )
+    or
+    exists(TupleExprCfgNode tuple |
+      node1.asExpr() = tuple.getField(c.(TuplePositionContent).getPosition()) and
+      node2.asExpr() = tuple
+    )
+    or
+    c instanceof ArrayElementContent and
+    node1.asExpr() =
+      [
+        node2.asExpr().(ArrayRepeatExprCfgNode).getRepeatOperand(),
+        node2.asExpr().(ArrayListExprCfgNode).getAnExpr()
+      ]
+    or
+    tupleAssignment(node1, node2.(PostUpdateNode).getPreUpdateNode(), c)
+    or
+    exists(AssignmentExprCfgNode assignment, IndexExprCfgNode index |
+      c instanceof ArrayElementContent and
+      assignment.getLhs() = index and
+      node1.asExpr() = assignment.getRhs() and
+      node2.(PostUpdateNode).getPreUpdateNode().asExpr() = index.getBase()
+    )
+    or
+    VariableCapture::storeStep(node1, c, node2)
+  }
+
   /**
    * Holds if data can flow from `node1` to `node2` via a store into `c`.  Thus,
    * `node2` references an object with a content `c.getAStoreContent()` that
    * contains the value of `node1`.
    */
   predicate storeStep(Node node1, ContentSet cs, Node node2) {
-    exists(Content c | c = cs.(SingletonContentSet).getContent() |
-      exists(CallExprCfgNode call, int pos |
-        tupleVariantConstruction(call.getCallExpr(),
-          c.(VariantPositionContent).getVariantCanonicalPath(pos)) and
-        node1.asExpr() = call.getArgument(pos) and
-        node2.asExpr() = call
-      )
-      or
-      exists(RecordExprCfgNode re, string field |
-        (
-          // Expression is for a struct-like enum variant.
-          recordVariantConstruction(re.getRecordExpr(),
-            c.(VariantFieldContent).getVariantCanonicalPath(field))
-          or
-          // Expression is for a struct.
-          structConstruction(re.getRecordExpr(),
-            c.(StructFieldContent).getStructCanonicalPath(field))
-        ) and
-        node1.asExpr() = re.getFieldExpr(field) and
-        node2.asExpr() = re
-      )
-      or
-      exists(TupleExprCfgNode tuple |
-        node1.asExpr() = tuple.getField(c.(TuplePositionContent).getPosition()) and
-        node2.asExpr() = tuple
-      )
-      or
-      c instanceof ArrayElementContent and
-      node1.asExpr() =
-        [
-          node2.asExpr().(ArrayRepeatExprCfgNode).getRepeatOperand(),
-          node2.asExpr().(ArrayListExprCfgNode).getAnExpr()
-        ]
-      or
-      tupleAssignment(node1, node2.(PostUpdateNode).getPreUpdateNode(), c)
-      or
-      exists(AssignmentExprCfgNode assignment, IndexExprCfgNode index |
-        c instanceof ArrayElementContent and
-        assignment.getLhs() = index and
-        node1.asExpr() = assignment.getRhs() and
-        node2.(PostUpdateNode).getPreUpdateNode().asExpr() = index.getBase()
-      )
-      or
-      VariableCapture::storeStep(node1, c, node2)
-    )
+    storeContentStep(node1, cs.(SingletonContentSet).getContent(), node2)
     or
     FlowSummaryImpl::Private::Steps::summaryStoreStep(node1.(Node::FlowSummaryNode).getSummaryNode(),
       cs, node2.(Node::FlowSummaryNode).getSummaryNode())