added gc flags and tracking api

std/hl/Gc.hx

@@ -21,8 +21,24 @@
  */
 package hl;
 
+enum GcFlag {
+	/**
+		Activate profiling: regularly print on stdout gc allocation stats
+	**/
+	Profile;
+	/**
+		Allows to dump a hlmemory.dump file when HL runs out of memory to be examined with hl memory inspector tool.
+	**/
+	DumpMem;
+	/**
+		Enable block tracking (see Gc.track API)
+	**/
+	Track;
+}
+
 class Gc {
 
+	public static var flags(get,set) : haxe.EnumFlags<GcFlag>;
 
 	public static function stats() {
 		var tot = 0., count = 0., mem = 0.;
@@ -30,6 +46,31 @@ class Gc {
 		return { totalAllocated : tot, allocationCount : count, currentMemory : mem };
 	}
 
+	/**
+		Start tracking an object field change.
+		The check will be performed every allocation and the callback function triggered everytime
+		a change has been performed since last check.
+		It is necessary to enable the Track flag in Gc.flags
+	**/
+	public static function track( obj : Dynamic, field : String, callb : Void -> Void ) {
+		var oval = if( Reflect.isFunction(obj) ) Api.getClosureValue(obj) else obj;
+		var fid = if( ~/^[0-9]+$/.match(field) ) Std.parseInt(field) else @:privateAccess field.bytes.hash();
+		if( !_track(oval, fid, callb) )
+			throw "Could not track "+obj+"."+field;
+	}
+
+	public static function untrack( obj : Dynamic ) {
+		var oval = if( Reflect.isFunction(obj) ) Api.getClosureValue(obj) else obj;
+		return _untrack(oval);
+	}
+
+	@:hlNative("std", "gc_untrack_all") public static function untrackAll() : Void {
+	}
+
+	@:hlNative("std", "gc_track_count") public static function trackCount() : Int {
+		return 0;
+	}
+
 	/**
 		Dump whole memory into target filename for analysis.
 	**/
@@ -37,11 +78,24 @@ class Gc {
 		_dump(@:privateAccess fileName.toUtf8());
 	}
 
+	static function get_flags() : haxe.EnumFlags<GcFlag> {
+		return haxe.EnumFlags.ofInt(_get_flags());
+	}
+
+	static function set_flags(v : haxe.EnumFlags<GcFlag>) {
+		_set_flags(v.toInt());
+		return v;
+	}
+
 	@:hlNative("std", "gc_dump_memory") static function _dump( b : hl.Bytes ) : Void {}
 
-	@:hlNative("std", "gc_profile") public static function activeProfileInfos( b : Bool ) : Void {}
 	@:hlNative("std", "gc_enable") public static function enable( b : Bool ) : Void {}
 	@:hlNative("std", "gc_major") public static function major() : Void {}
 	@:hlNative("std", "gc_stats") static function _stats( totalAllocated : hl.Ref<Float>, allocationCount : hl.Ref<Float>, currentMemory : hl.Ref<Float> ) : Void {}
+	@:hlNative("std", "gc_track") static function _track( obj : Dynamic, fid : Int, callb : Void -> Void ) : Bool { return false; }
+	@:hlNative("std", "gc_untrack") static function _untrack( obj : Dynamic ) : Bool { return false; }
+
+	@:hlNative("std", "gc_get_flags") static function _get_flags() : Int { return 0; }
+	@:hlNative("std", "gc_set_flags") static function _set_flags( v : Int ) {}
 
 }