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