[NFC] Dump an ASTScopeImpl’s parent nodes

Author: beccadax

include/swift/AST/ASTScope.h

@@ -250,12 +250,15 @@ class ASTScopeImpl : public ASTAllocated<ASTScopeImpl> {
 
   void printRange(llvm::raw_ostream &out) const;
 
+  void printParents(llvm::raw_ostream &out) const;
+
 protected:
   virtual void printSpecifics(llvm::raw_ostream &out) const {}
   virtual NullablePtr<const void> addressForPrinting() const;
 
 public:
   SWIFT_DEBUG_DUMP;
+  SWIFT_DEBUG_DUMPER(dumpParents());
 
   void dumpOneScopeMapLocation(std::pair<unsigned, unsigned> lineColumn);
 

lib/AST/ASTScopePrinting.cpp

@@ -40,6 +40,8 @@ using namespace ast_scope;
 
 void ASTScopeImpl::dump() const { print(llvm::errs(), 0, false); }
 
+void ASTScopeImpl::dumpParents() const { printParents(llvm::errs()); }
+
 void ASTScopeImpl::dumpOneScopeMapLocation(
     std::pair<unsigned, unsigned> lineColumn) {
   auto bufferID = getSourceFile()->getBufferID();
@@ -124,6 +126,21 @@ void ASTScopeImpl::printRange(llvm::raw_ostream &out) const {
   printSourceRange(out, range, getSourceManager());
 }
 
+void ASTScopeImpl::printParents(llvm::raw_ostream &out) const {
+  SmallVector<const ASTScopeImpl *, 8> nodes;
+  const ASTScopeImpl *cursor = this;
+  do {
+    nodes.push_back(cursor);
+    cursor = cursor->getParent().getPtrOrNull();
+  } while (cursor);
+
+  std::reverse(nodes.begin(), nodes.end());
+
+  for (auto i : indices(nodes)) {
+    nodes[i]->print(out, i, /*lastChild=*/true, /*printChildren=*/false);
+  }
+}
+
 #pragma mark printSpecifics