88 lines
1.2 KiB
C
88 lines
1.2 KiB
C
#include <stddef.h>
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#include <stdint.h>
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// common types
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typedef uintptr_t U;
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typedef intptr_t I;
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typedef uint8_t U8;
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typedef uint32_t U32;
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typedef int32_t I32;
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typedef size_t Z;
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// objects
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typedef uintptr_t O;
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// cons pair
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typedef struct C C;
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struct C {
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O head, tail;
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};
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// symbol
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typedef struct S S;
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struct S {
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U8 *data;
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U32 hash;
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Z len;
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};
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// symbol table
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typedef struct St St;
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struct St {
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I count;
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Z capacity;
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S **data;
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};
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// gc header
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enum { OBJ_CONS, OBJ_SYM, OBJ_FWD };
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typedef struct H H;
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struct H {
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I type;
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Z size;
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};
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// heap
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typedef struct E E;
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struct E {
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struct {
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U8 *start, *end;
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U8 *free;
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} from, to;
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I root_count;
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Z root_capacity;
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O **roots;
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};
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extern E heap;
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extern St syms;
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#define IMM(x) ((x) & 1)
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#define NUM(x) (((O)((I)(x) << 1)) | (V)1)
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#define ORD(x) ((I)(x) >> 1)
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#define BOX(x) ((O)(x))
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#define UNBOX(x) ((H *)(x))
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#define NIL ((O)0)
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#define GC_HEAP_BYTES (1024 * 1024)
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// GC
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void addroot(O *ptr);
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I rootmark(void);
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void rootreset(I mark);
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void collect(void);
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H *alloc(Z sz);
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void gcinit(void);
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void gcfinalize(void);
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S *intern(const char *str, I len);
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O mksym(const char *str);
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O cons(O head, O tail);
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C *uncons(O obj);
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void print(O obj);
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void println(O obj);
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