Optimize PartialDiagnostic's memory-allocation behavior by placing a

cache of PartialDiagnostic::Storage objects into an allocator within
the ASTContext. This eliminates a significant amount of malloc
traffic, for a 10% performance improvement in -fsyntax-only wall-clock
time with 403.gcc's combine.c.

Also, eliminate the RequireNonAbstractType hack I put in earlier,
which was but a symptom of this larger problem.

Fixes <rdar://problem/7806091>.

llvm-svn: 99849

1 files changed, 11 insertions, 0 deletions

diff --git a/clang/lib/Basic/Diagnostic.cpp b/clang/lib/Basic/Diagnostic.cpp
index 21a8aeae429..9b8bae31427 100644
--- a/clang/lib/Basic/Diagnostic.cpp
+++ b/clang/lib/Basic/Diagnostic.cpp
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/PartialDiagnostic.h"
 
 #include "clang/Lex/LexDiagnostic.h"
 #include "clang/Parse/ParseDiagnostic.h"
@@ -1246,3 +1247,13 @@ StoredDiagnostic::Deserialize(FileManager &FM, SourceManager &SM,
 ///  DiagnosticClient should be included in the number of diagnostics
 ///  reported by Diagnostic.
 bool DiagnosticClient::IncludeInDiagnosticCounts() const { return true; }
+
+PartialDiagnostic::StorageAllocator::StorageAllocator() {
+  for (unsigned I = 0; I != NumCached; ++I)
+    FreeList[I] = Cached + I;
+  NumFreeListEntries = NumCached;
+}
+
+PartialDiagnostic::StorageAllocator::~StorageAllocator() {
+  assert(NumFreeListEntries == NumCached && "A partial is on the lamb");
+}