X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FSupport%2FAllocator.cpp;h=215b0f249d96f82cda56763998be5326fae3569e;hb=78a113cbff5941ac6163a3f240ea6e91cb85649a;hp=31b45c8d4aae77538940f8f1b9e948f7f2726e23;hpb=c5b7b196770f8c3c83e4ec06c0f2a1f53b623b6f;p=oota-llvm.git

diff --git a/lib/Support/Allocator.cpp b/lib/Support/Allocator.cpp
index 31b45c8d4aa..215b0f249d9 100644
--- a/lib/Support/Allocator.cpp
+++ b/lib/Support/Allocator.cpp
@@ -12,10 +12,10 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/Allocator.h"
-#include "llvm/System/DataTypes.h"
+#include "llvm/Support/DataTypes.h"
 #include "llvm/Support/Recycler.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/System/Memory.h"
+#include "llvm/Support/Memory.h"
 #include <cstring>
 
 namespace llvm {
@@ -23,9 +23,7 @@ namespace llvm {
 BumpPtrAllocator::BumpPtrAllocator(size_t size, size_t threshold,
                                    SlabAllocator &allocator)
     : SlabSize(size), SizeThreshold(threshold), Allocator(allocator),
-      CurSlab(0), BytesAllocated(0) {
-  StartNewSlab();
-}
+      CurSlab(0), BytesAllocated(0) { }
 
 BumpPtrAllocator::~BumpPtrAllocator() {
   DeallocateSlabs(CurSlab);
@@ -46,6 +44,12 @@ char *BumpPtrAllocator::AlignPtr(char *Ptr, size_t Alignment) {
 /// StartNewSlab - Allocate a new slab and move the bump pointers over into
 /// the new slab.  Modifies CurPtr and End.
 void BumpPtrAllocator::StartNewSlab() {
+  // If we allocated a big number of slabs already it's likely that we're going
+  // to allocate more. Increase slab size to reduce mallocs and possibly memory
+  // overhead. The factors are chosen conservatively to avoid overallocation.
+  if (BytesAllocated >= SlabSize * 128)
+    SlabSize *= 2;
+
   MemSlab *NewSlab = Allocator.Allocate(SlabSize);
   NewSlab->NextPtr = CurSlab;
   CurSlab = NewSlab;
@@ -72,6 +76,8 @@ void BumpPtrAllocator::DeallocateSlabs(MemSlab *Slab) {
 /// Reset - Deallocate all but the current slab and reset the current pointer
 /// to the beginning of it, freeing all memory allocated so far.
 void BumpPtrAllocator::Reset() {
+  if (!CurSlab)
+    return;
   DeallocateSlabs(CurSlab->NextPtr);
   CurSlab->NextPtr = 0;
   CurPtr = (char*)(CurSlab + 1);
@@ -81,6 +87,9 @@ void BumpPtrAllocator::Reset() {
 /// Allocate - Allocate space at the specified alignment.
 ///
 void *BumpPtrAllocator::Allocate(size_t Size, size_t Alignment) {
+  if (!CurSlab) // Start a new slab if we haven't allocated one already.
+    StartNewSlab();
+
   // Keep track of how many bytes we've allocated.
   BytesAllocated += Size;
 
@@ -127,6 +136,14 @@ unsigned BumpPtrAllocator::GetNumSlabs() const {
   return NumSlabs;
 }
 
+size_t BumpPtrAllocator::getTotalMemory() const {
+  size_t TotalMemory = 0;
+  for (MemSlab *Slab = CurSlab; Slab != 0; Slab = Slab->NextPtr) {
+    TotalMemory += Slab->Size;
+  }
+  return TotalMemory;
+}
+  
 void BumpPtrAllocator::PrintStats() const {
   unsigned NumSlabs = 0;
   size_t TotalMemory = 0;