From: Chris Lattner <sabre@nondot.org>
Date: Thu, 20 Nov 2008 05:51:55 +0000 (+0000)
Subject: remove the type_info identifier cache.  Compared to the cost
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=572af49cc0052931e7b06902d99c72f04b75704e;p=clang

remove the type_info identifier cache.  Compared to the cost
of doing the lookup_decl, the hash lookup is cheap.  Also,
typeid doesn't happen enough in real world code to worry about
it.

I'd like to eventually get rid of KnownFunctionIDs from Sema
also, but today is not that day.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@59711 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Sema/Sema.cpp b/lib/Sema/Sema.cpp
index e1eb86c98f..c9e4cd9833 100644
--- a/lib/Sema/Sema.cpp
+++ b/lib/Sema/Sema.cpp
@@ -103,9 +103,7 @@ Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer)
   KnownFunctionIDs[id_vsnprintf_chk] = &IT.get("__builtin___vsnprintf_chk");
   KnownFunctionIDs[id_vprintf]       = &IT.get("vprintf");
 
-  Ident_TypeInfo = 0;
   StdNamespace = 0;
-
   TUScope = 0;
   if (getLangOptions().CPlusPlus)
     FieldCollector.reset(new CXXFieldCollector());
diff --git a/lib/Sema/Sema.h b/lib/Sema/Sema.h
index 7840dec5e7..52610ef6b7 100644
--- a/lib/Sema/Sema.h
+++ b/lib/Sema/Sema.h
@@ -192,9 +192,6 @@ public:
   /// This list is populated upon the creation of a Sema object.    
   IdentifierInfo* KnownFunctionIDs[id_num_known_functions];
 
-  /// Identifiers used by the C++ language
-  IdentifierInfo *Ident_TypeInfo; // "type_info" - lazily created
-
   /// Translation Unit Scope - useful to Objective-C actions that need
   /// to lookup file scope declarations in the "ordinary" C decl namespace.
   /// For example, user-defined classes, built-in "id" type, etc.
diff --git a/lib/Sema/SemaExprCXX.cpp b/lib/Sema/SemaExprCXX.cpp
index 0186fc3f14..80bd8eeef3 100644
--- a/lib/Sema/SemaExprCXX.cpp
+++ b/lib/Sema/SemaExprCXX.cpp
@@ -55,21 +55,16 @@ Action::ExprResult
 Sema::ActOnCXXTypeid(SourceLocation OpLoc, SourceLocation LParenLoc,
                      bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
   const NamespaceDecl *StdNs = GetStdNamespace();
-  if (!StdNs) {
-    Diag(OpLoc, diag::err_need_header_before_typeid);
-    return ExprResult(true);
-  }
-  if (!Ident_TypeInfo) {
-    Ident_TypeInfo = &PP.getIdentifierTable().get("type_info");
-  }
-  Decl *TypeInfoDecl = LookupDecl(Ident_TypeInfo,
+  if (!StdNs)
+    return Diag(OpLoc, diag::err_need_header_before_typeid);
+  
+  IdentifierInfo *TypeInfoII = &PP.getIdentifierTable().get("type_info");
+  Decl *TypeInfoDecl = LookupDecl(TypeInfoII,
                                   Decl::IDNS_Tag | Decl::IDNS_Ordinary,
                                   0, StdNs, /*createBuiltins=*/false);
   RecordDecl *TypeInfoRecordDecl = dyn_cast_or_null<RecordDecl>(TypeInfoDecl);
-  if (!TypeInfoRecordDecl) {
-    Diag(OpLoc, diag::err_need_header_before_typeid);
-    return ExprResult(true);
-  }
+  if (!TypeInfoRecordDecl)
+    return Diag(OpLoc, diag::err_need_header_before_typeid);
 
   QualType TypeInfoType = Context.getTypeDeclType(TypeInfoRecordDecl);