Swift: extract MaterizliePackExpr

Author: AlexDenisov

swift/extractor/infra/SwiftTagTraits.h

@@ -199,7 +199,7 @@ MAP(swift::Expr, ExprTag)
   MAP(swift::MacroExpansionExpr, void) // unexpanded macro in an expr context, skipping
   MAP(swift::CopyExpr, CopyExprTag)
   MAP(swift::ConsumeExpr, ConsumeExprTag)
-  MAP(swift::MaterializePackExpr, void)  // TODO (introduced in 5.9)
+  MAP(swift::MaterializePackExpr, MaterializePackExprTag)
   MAP(swift::SingleValueStmtExpr, SingleValueStmtExprTag)
 
 MAP(swift::Decl, DeclTag)

swift/extractor/translators/ExprTranslator.cpp

@@ -669,4 +669,11 @@ codeql::ConsumeExpr ExprTranslator::translateConsumeExpr(const swift::ConsumeExp
   return entry;
 }
 
+codeql::MaterializePackExpr ExprTranslator::translateMaterializePackExpr(
+    const swift::MaterializePackExpr& expr) {
+  auto entry = createExprEntry(expr);
+  entry.sub_expr = dispatcher.fetchLabel(expr.getFromExpr());
+  return entry;
+}
+
 }  // namespace codeql

swift/extractor/translators/ExprTranslator.h

@@ -124,6 +124,7 @@ class ExprTranslator : public AstTranslatorBase<ExprTranslator> {
   codeql::PackElementExpr translatePackElementExpr(const swift::PackElementExpr& expr);
   codeql::CopyExpr translateCopyExpr(const swift::CopyExpr& expr);
   codeql::ConsumeExpr translateConsumeExpr(const swift::ConsumeExpr& expr);
+  codeql::MaterializePackExpr translateMaterializePackExpr(const swift::MaterializePackExpr& expr);
 
  private:
   void fillClosureExpr(const swift::AbstractClosureExpr& expr, codeql::ClosureExpr& entry);

swift/ql/.generated.list

@@ -1444,6 +1444,14 @@ module Exprs {
     }
   }
 
+  private class MaterializePackExprTree extends AstStandardPostOrderTree {
+    override MaterializePackExpr ast;
+
+    final override ControlFlowElement getChildElement(int i) {
+      i = 0 and result.asAstNode() = ast.getSubExpr().getFullyUnresolved()
+    }
+  }
+
   /** Control-flow for Move Semantics. See the QLDoc for `CopyExpr` for details. */
   private class CopyExprTree extends AstStandardPostOrderTree {
     override CopyExpr ast;