Improve AST dumping:

1) When dumping a declaration that declares a name for a type, also dump the named type.
 2) Add a #pragma clang __debug dump X, that dumps the lookup results for X in
    the current context.

llvm-svn: 257529

clang/lib/Sema/SemaLookup.cpp

@@ -650,6 +650,13 @@ void LookupResult::print(raw_ostream &Out) {
   }
 }
 
+LLVM_DUMP_METHOD void LookupResult::dump() {
+  llvm::errs() << "lookup results for " << getLookupName().getAsString()
+               << ":\n";
+  for (NamedDecl *D : *this)
+    D->dump();
+}
+
 /// \brief Lookup a builtin function, when name lookup would otherwise
 /// fail.
 static bool LookupBuiltin(Sema &S, LookupResult &R) {
@@ -4991,3 +4998,12 @@ const Sema::TypoExprState &Sema::getTypoExprState(TypoExpr *TE) const {
 void Sema::clearDelayedTypo(TypoExpr *TE) {
   DelayedTypos.erase(TE);
 }
+
+void Sema::ActOnPragmaDump(Scope *S, SourceLocation IILoc, IdentifierInfo *II) {
+  DeclarationNameInfo Name(II, IILoc);
+  LookupResult R(*this, Name, LookupAnyName, Sema::NotForRedeclaration);
+  R.suppressDiagnostics();
+  R.setHideTags(false);
+  LookupName(R, S);
+  R.dump();
+}