1 files changed, 263 insertions, 0 deletions
diff --git a/sc4pd/headers/lang/GC.h b/sc4pd/headers/lang/GC.h
new file mode 100644
index 0000000..4dc162a
--- /dev/null
+++ b/sc4pd/headers/lang/GC.h
@@ -0,0 +1,263 @@
+/*
+	SuperCollider real time audio synthesis system
+    Copyright (c) 2002 James McCartney. All rights reserved.
+	http://www.audiosynth.com
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+/*
+
+The garbage collector for SuperCollider.
+Based on Wilson and Johnstone's real time collector and the Baker treadmill.
+
+*/
+
+#ifndef _GC_
+#define _GC_
+
+#include "PyrObject.h"
+#include "VMGlobals.h"
+#include "AdvancingAllocPool.h"
+
+void DumpSimpleBackTrace(VMGlobals *g);
+
+const int kMaxPoolSet = 7;
+const int kNumGCSizeClasses = 28;
+const int kFinalizerSet = kNumGCSizeClasses;
+const int kNumGCSets = kNumGCSizeClasses + 1;
+
+class GCSet
+{
+public:
+	GCSet() {}
+	void Init(int inSizeClass);
+	
+	bool HasFree() { return mFree != &mBlack; }
+	
+private:
+	friend class PyrGC;
+	
+	void MoveWhiteToFree();
+	
+	PyrObjectHdr mBlack;
+	PyrObjectHdr mWhite;
+	PyrObjectHdr* mFree;
+};
+
+struct SlotRef {
+	SlotRef(PyrObject* inObj, int32 inIndex) : obj(inObj), slotIndex(inIndex) {}
+	
+	PyrObject *obj;
+	int32 slotIndex;
+};
+
+class PyrGC
+{
+public:
+	PyrGC(VMGlobals *g, AllocPool *inPool, PyrClass *mainProcessClass, long poolSize);
+	
+	PyrObject* New(size_t inNumBytes, long inFlags, long inFormat, bool inCollect);
+						
+	static PyrObject* NewPermanent(size_t inNumBytes, 
+						long inFlags, long inFormat);
+
+	PyrObject* NewFinalizer(ObjFuncPtr finalizeFunc, PyrObject *inObject, bool inCollect);
+	
+	int32 ProcessID() { return mProcessID; }
+		
+#if 0	
+// Codewarrior is not inlining these.. why?
+	bool IsBlack(PyrObjectHdr* inObj) { return inObj->gc_color == mBlackColor; }
+	bool IsWhite(PyrObjectHdr* inObj) { return inObj->gc_color == mWhiteColor; }
+	bool IsGrey(PyrObjectHdr* inObj) { return inObj->gc_color == mGreyColor; }
+	bool IsMarker(PyrObjectHdr* inObj) { return inObj->gc_color == obj_gcmarker; }
+#else 
+
+#define IsBlack(inObj) ((inObj)->gc_color == mBlackColor)
+#define IsWhite(inObj) ((inObj)->gc_color == mWhiteColor)
+#define IsGrey(inObj) ((inObj)->gc_color == mGreyColor)
+#define IsFree(inObj) (!(IsMarker(inObj) || inObj->IsPermanent() || \
+					IsBlack(inObj) || IsWhite(inObj) || IsGrey(inObj)))
+#define IsMarker(inObj) ((inObj)->gc_color == obj_gcmarker)
+#endif
+
+	bool ObjIsBlack(PyrObjectHdr* inObj) { return IsBlack(inObj); }
+	bool ObjIsGrey(PyrObjectHdr* inObj) { return IsGrey(inObj); }
+	bool ObjIsFree(PyrObjectHdr* inObj) { return IsFree(inObj); }
+
+
+	// general purpose write barriers:
+	void GCWrite(PyrObjectHdr* inParent, PyrSlot* inSlot) 
+		{ 
+			if (IsBlack(inParent) && IsObj(inSlot) && IsWhite(inSlot->uo)) {
+				ToGrey(inSlot->uo);
+			}
+		}
+	void GCWrite(PyrObjectHdr* inParent, PyrObjectHdr* inChild) 
+		{ 
+			if (IsBlack(inParent) && IsWhite(inChild)) {
+				ToGrey(inChild);
+			}
+		}
+	// when you know the parent is black:
+	void GCWriteBlack(PyrSlot* inSlot) 
+		{ 
+			if (IsObj(inSlot)) {
+				if (IsWhite(inSlot->uo)) {
+					ToGrey(inSlot->uo);
+				}
+			}
+		}
+	void GCWriteBlack(PyrObjectHdr* inChild) 
+		{ 
+			if (IsWhite(inChild)) {
+				ToGrey(inChild);
+			}
+		}
+	// when you know the child is white
+	void GCWriteNew(PyrObjectHdr* inParent, PyrObjectHdr* inChild) 
+		{ 
+			if (IsBlack(inParent)) {
+				ToGrey(inChild);
+			}
+		}
+
+// users should not call anything below.
+				
+	void Collect();
+	void Collect(int32 inNumToScan);
+	void FullCollection();
+	void ScanFinalizers();
+	GCSet* GetGCSet(PyrObjectHdr* inObj);
+	void CompletePartialScan(PyrObject *obj);
+	
+	void ToGrey(PyrObjectHdr* inObj);
+	void ToGrey2(PyrObjectHdr* inObj);
+	void ToBlack(PyrObjectHdr* inObj);
+	void ToWhite(PyrObjectHdr *obj);
+
+	int32 StackDepth() { return mVMGlobals->sp - mStack->slots + 1; }
+	PyrObject* Stack() { return mStack; }
+	void SetStack(PyrObject* inStack) { mStack = inStack; }
+
+	bool SanityCheck();
+	bool SanityCheck2();
+	bool LinkSanity();
+	bool ListSanity();
+	bool BlackToWhiteCheck(PyrObject *objA);
+	bool SanityMarkObj(PyrObject *objA, PyrObject *fromObj, int level);
+	bool SanityClearObj(PyrObject *objA, int level);
+	void DumpInfo();
+	void DumpEverything();
+	
+	void BecomePermanent(PyrObject *inObject);
+	void BecomeImmutable(PyrObject *inObject);
+	
+private:
+	void Free(PyrObject* inObj);
+	void ScanSlots(PyrSlot *inSlots, long inNumToScan);
+	void SweepBigObjects();
+	void DoPartialScan(int32 inObjSize);
+	bool ScanOneObj();
+	void Flip();
+	void ScanStack();
+	void DLRemove(PyrObjectHdr *obj);
+	void DLInsertAfter(PyrObjectHdr *after, PyrObjectHdr *obj);
+	void DLInsertBefore(PyrObjectHdr *before, PyrObjectHdr *obj);
+
+	void ClearMarks();
+	void Finalize(PyrObject *obj);
+	
+	VMGlobals *mVMGlobals;
+	AllocPool *mPool;
+	AdvancingAllocPool mNewPool;
+	GCSet mSets[kNumGCSets]; 
+	PyrProcess *mProcess; // the root is the pyrprocess which contains this struct
+	PyrObject *mStack;
+	PyrObject *mPartialScanObj;
+	PyrObjectHdr mGrey;
+
+	GCSet *mPartialScanSet;
+	int32 mPartialScanSlot;
+	int32 mNumToScan;
+	int32 mNumGrey;
+	int32 mCurSet;
+	
+	int32 mFlips, mCollects, mAllocTotal, mScans, mNumAllocs;
+	
+	unsigned char mBlackColor, mGreyColor, mWhiteColor, mFreeColor;
+	int8 mProcessID;
+	bool mCanSweep;
+	bool mRunning;
+};
+
+inline void PyrGC::DLRemove(PyrObjectHdr *obj) 
+{
+	obj->next->prev = obj->prev;
+	obj->prev->next = obj->next;
+}
+
+inline void PyrGC::DLInsertAfter(PyrObjectHdr *after, PyrObjectHdr *obj) 
+{
+	obj->next = after->next;
+	obj->prev = after;
+	after->next->prev = obj;
+	after->next = obj;
+}
+
+inline void PyrGC::DLInsertBefore(PyrObjectHdr *before, PyrObjectHdr *obj) 
+{
+	obj->prev = before->prev;
+	obj->next = before;
+	before->prev->next = obj;
+	before->prev = obj;
+}
+
+inline GCSet* PyrGC::GetGCSet(PyrObjectHdr* inObj) 
+{
+	return mSets + (inObj->classptr == class_finalizer ? kFinalizerSet : inObj->obj_sizeclass);
+}
+
+inline void PyrGC::ToBlack(PyrObjectHdr *obj) 
+{		
+	if (IsGrey(obj)) {
+		mNumGrey--;
+		//post("ToBlack %d\n", mNumGrey);
+	}
+
+	DLRemove(obj);		
+	
+	GCSet *gcs = GetGCSet(obj);
+	DLInsertAfter(&gcs->mBlack, obj);
+
+	obj->gc_color = mBlackColor;
+}
+
+inline void PyrGC::ToWhite(PyrObjectHdr *obj) 
+{	
+	if (IsGrey(obj)) {
+		mNumGrey--;
+		//post("ToWhite %d\n", mNumGrey);
+	}
+
+	DLRemove(obj);	
+		
+	GCSet *gcs = GetGCSet(obj);
+	DLInsertAfter(&gcs->mWhite, obj);
+
+	obj->gc_color = mWhiteColor;
+}
+
+#endif