Preprocessor: Allocate MacroInfo objects using a BumpPtrAllocator instead using new/delete. This speeds up -Eonly on Cocoa.h using the regular lexer by 1.8% and the PTHLexer by 3%.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@61042 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 19 insertions, 0 deletions

diff --git a/include/clang/Lex/Preprocessor.h b/include/clang/Lex/Preprocessor.h
index 77136688aa..efe057e334 100644
--- a/include/clang/Lex/Preprocessor.h
+++ b/include/clang/Lex/Preprocessor.h
@@ -24,6 +24,7 @@
 #include "clang/Basic/SourceLocation.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/OwningPtr.h"
+#include "llvm/Support/Allocator.h"
 
 namespace clang {
   
@@ -55,6 +56,10 @@ class Preprocessor {
   /// PTH - An optional PTHManager object used for getting tokens from
   ///  a token cache rather than lexing the original source file.
   llvm::OwningPtr<PTHManager> PTH;
+  
+  /// BP - A BumpPtrAllocator object used to quickly allocate and release
+  ///  objects internal to the Preprocessor.
+  llvm::BumpPtrAllocator BP;
     
   /// Identifiers for builtin macros and other builtins.
   IdentifierInfo *Ident__LINE__, *Ident__FILE__;   // __LINE__, __FILE__
@@ -145,6 +150,10 @@ class Preprocessor {
   /// to the actual definition of the macro.
   llvm::DenseMap<IdentifierInfo*, MacroInfo*> Macros;
   
+  /// MICache - A "freelist" of MacroInfo objects that can be reused for quick
+  ///  allocation.
+  std::vector<MacroInfo*> MICache;
+  
   // Various statistics we track for performance analysis.
   unsigned NumDirectives, NumIncluded, NumDefined, NumUndefined, NumPragma;
   unsigned NumIf, NumElse, NumEndif;
@@ -530,6 +539,16 @@ private:
     IncludeMacroStack.pop_back();
   }
   
+  /// AllocateMacroInfo - Allocate a new MacroInfo object with the provide
+  ///  SourceLocation.
+  MacroInfo* AllocateMacroInfo(SourceLocation L);
+  
+  /// ReleaseMacroInfo - Release the specified MacroInfo.  This memory will
+  ///  be reused for allocating new MacroInfo objects.
+  void ReleaseMacroInfo(MacroInfo* MI) {
+    MICache.push_back(MI);
+  }
+  
   /// isInPrimaryFile - Return true if we're in the top-level file, not in a
   /// #include.
   bool isInPrimaryFile() const;