Initial community commit

Src/Wasabi/bfc/freelist.h

@@ -0,0 +1,93 @@
+#ifndef _FREELIST_H
+#define _FREELIST_H
+
+#include <bfc/wasabi_std.h>
+#include <bfc/memblock.h>
+#include <bfc/ptrlist.h>
+
+// actual implementation
+class FreelistPriv {
+protected:
+  FreelistPriv();
+  ~FreelistPriv();
+
+  void *getRecord(int typesize, int blocksize, int initialblocksize);
+  void freeRecord(void *rec);
+
+private:
+  int total_allocated;
+  typedef uint8_t MBT;
+  class FLMemBlock : public MemBlock<MBT> {
+  public:
+    FLMemBlock(int siz) : MemBlock<MBT>(siz) {
+      freelist = getMemory();
+      nallocated = 0;
+    }
+    void *freelist;
+    int nallocated;	// # of records assigned from block
+  };
+  PtrList< FLMemBlock > blocks; // the blocks of mem we alloc from
+};
+
+// type-safe template
+static const int DEF_BLOCKSIZE=250;
+template
+<class T, int BLOCKSIZE=DEF_BLOCKSIZE, int INITIALBLOCKSIZE=DEF_BLOCKSIZE, int ALIGNMENT=4>
+class Freelist : private FreelistPriv {
+public:
+  // just returns the memory, you have to call constructor manually
+  T *getRecord() {
+    return static_cast<T *>(FreelistPriv::getRecord(itemsize(), BLOCKSIZE, INITIALBLOCKSIZE));
+  }
+
+  // creates object via default constructor
+  T *newRecord() {
+    T *ret = getRecord();
+#ifdef FORTIFY
+#undef new
+#endif
+    new(ret) T;
+#ifdef FORTIFY
+#define new ZFortify_New
+#endif
+    return ret;
+  }
+
+  // creates object via 1-parameter constructor
+  template<class P1>
+  T *newRecord(P1 p1) {
+    T *ret = getRecord();
+#ifdef FORTIFY
+#undef new
+#endif
+    new(ret) T(p1);
+#ifdef FORTIFY
+#define new ZFortify_New
+#endif
+    return ret;
+  }
+
+  // just frees it, you have to call destructor manually
+  void freeRecord(T *record) { FreelistPriv::freeRecord(record); }
+
+  // calls delete for you, and frees it
+  void deleteRecord(T *record) {
+    if (record != NULL) {
+      record->~T();
+      freeRecord(record);
+    }
+  }
+
+  void deletePtrList(PtrList<T> *list) {
+    ASSERT(list != NULL);
+    for (int i = 0; i < list->getNumItems(); i++) {
+      deleteRecord(list->enumItem(i));
+    }
+    list->removeAll();
+  }
+
+protected:
+  int itemsize() { return (sizeof(T) + (ALIGNMENT-1)) - (sizeof(T) % ALIGNMENT); }
+};
+
+#endif