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Removed extra word in sexp

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This commit is contained in:
Egor Sheremetov 2023-08-09 20:16:51 +02:00
parent dd7cbc7869
commit 3937ecf387
4 changed files with 114 additions and 86 deletions
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27
runtime/runtime_common.h
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@ -7,20 +7,15 @@
//#define FULL_INVARIANT_CHECKS
#define STRING_TAG 0x00000001
//# define STRING_TAG 0x00000000
#define ARRAY_TAG 0x00000003
//# define ARRAY_TAG 0x00000002
#define SEXP_TAG 0x00000005
//# define SEXP_TAG 0x00000004
#define CLOSURE_TAG 0x00000007
//# define CLOSURE_TAG 0x00000006
#define UNBOXED_TAG 0x00000009 // Not actually a data_header; used to return from LkindOf
#define LEN(x) ((x & 0xFFFFFFF8) >> 3)
#define TAG(x) (x & 0x00000007)
//# define TAG(x) (x & 0x00000006)
#define SEXP_ONLY_HEADER_SZ (2 * sizeof(int))
#define SEXP_ONLY_HEADER_SZ (sizeof(int))
#ifndef FULL_INVARIANT_CHECKS
# define DATA_HEADER_SZ (sizeof(size_t) + sizeof(int))
@ -31,7 +26,7 @@
#define MEMBER_SIZE sizeof(int)
#define TO_DATA(x) ((data *)((char *)(x)-DATA_HEADER_SZ))
#define TO_SEXP(x) ((sexp *)((char *)(x)-DATA_HEADER_SZ - SEXP_ONLY_HEADER_SZ))
#define TO_SEXP(x) ((sexp *)((char *)(x)-DATA_HEADER_SZ))
#define UNBOXED(x) (((int)(x)) & 0x0001)
#define UNBOX(x) (((int)(x)) >> 1)
@ -60,11 +55,19 @@ typedef struct {
} data;
typedef struct {
// duplicates contents.data_header in order to be able to understand if it is s-exp during iteration over heap
int sexp_header;
// stores hashed s-expression constructor name
int tag;
data contents;
// store tag in the last three bits to understand what structure this is, other bits are filled with
// other utility info (i.e., size for array, number of fields for s-expression)
int data_header;
#ifdef FULL_INVARIANT_CHECKS
size_t id;
#endif
// last bit is used as MARK-BIT, the rest are used to store address where object should move
// last bit can be used because due to alignment we can assume that last two bits are always 0's
size_t forward_address;
int tag;
int contents[0];
} sexp;
#endif