Major refactor and restructure. Add CMake for anticipated windows

support.

src/core/gc.h

@@ -0,0 +1,72 @@
+/*
+* Copyright (c) 2017 Calvin Rose
+*
+* Permission is hereby granted, free of charge, to any person obtaining a copy
+* of this software and associated documentation files (the "Software"), to
+* deal in the Software without restriction, including without limitation the
+* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+* sell copies of the Software, and to permit persons to whom the Software is
+* furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in
+* all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+* IN THE SOFTWARE.
+*/
+
+#ifndef DST_GC_H
+#define DST_GC_H
+
+#include <dst/dst.h>
+
+/* The metadata header associated with an allocated block of memory */
+#define dst_gc_header(mem) ((DstGCMemoryHeader *)(mem) - 1)
+
+#define DST_MEM_TYPEBITS 0xFF
+#define DST_MEM_REACHABLE 0x100
+#define DST_MEM_DISABLED 0x200
+
+#define dst_gc_settype(m, t) ((dst_gc_header(m)->flags |= (0xFF & (t))))
+#define dst_gc_type(m) (dst_gc_header(m)->flags & 0xFF)
+
+#define dst_gc_mark(m) (dst_gc_header(m)->flags |= DST_MEM_REACHABLE)
+#define dst_gc_unmark(m) (dst_gc_header(m)->flags &= ~DST_MEM_COLOR)
+#define dst_gc_reachable(m) (dst_gc_header(m)->flags & DST_MEM_REACHABLE)
+
+
+/* Memory header struct. Node of a linked list of memory blocks. */
+typedef struct DstGCMemoryHeader DstGCMemoryHeader;
+struct DstGCMemoryHeader {
+    DstGCMemoryHeader *next;
+    uint32_t flags;
+};
+
+/* Memory types for the GC. Different from DstType to include funcenv and funcdef. */
+typedef enum DstMemoryType DstMemoryType;
+enum DstMemoryType {
+    DST_MEMORY_NONE,
+    DST_MEMORY_STRING,
+    DST_MEMORY_SYMBOL,
+    DST_MEMORY_ARRAY,
+    DST_MEMORY_TUPLE,
+    DST_MEMORY_TABLE,
+    DST_MEMORY_STRUCT,
+    DST_MEMORY_FIBER,
+    DST_MEMORY_BUFFER,
+    DST_MEMORY_FUNCTION,
+    DST_MEMORY_ABSTRACT,
+    DST_MEMORY_FUNCENV,
+    DST_MEMORY_FUNCDEF
+};
+
+/* To allocate collectable memory, one must calk dst_alloc, initialize the memory,
+ * and then call when dst_enablegc when it is initailize and reachable by the gc (on the DST stack) */
+void *dst_gcalloc(DstMemoryType type, size_t size);
+
+#endif