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Add LJ_GC64 mode: 64 bit GC object references.

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Actually NaN tagging with 47 bit pointers and 13+4 bit tags.
This commit is contained in:
Mike Pall
2015-01-03 15:23:58 +01:00
parent 054e6abe37
commit cb481ddc8f
13 changed files with 183 additions and 29 deletions
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15
src/lj_def.h
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@@ -47,7 +47,9 @@ typedef unsigned int uintptr_t;
/* Various VM limits. */
#define LJ_MAX_MEM32 0x7fffff00 /* Max. 32 bit memory allocation. */
#define LJ_MAX_MEM LJ_MAX_MEM32 /* Max. total memory allocation. */
#define LJ_MAX_MEM64 ((uint64_t)1<<47) /* Max. 64 bit memory allocation. */
/* Max. total memory allocation. */
#define LJ_MAX_MEM (LJ_GC64 ? LJ_MAX_MEM64 : LJ_MAX_MEM32)
#define LJ_MAX_ALLOC LJ_MAX_MEM /* Max. individual allocation length. */
#define LJ_MAX_STR LJ_MAX_MEM32 /* Max. string length. */
#define LJ_MAX_BUF LJ_MAX_MEM32 /* Max. buffer length. */
@@ -67,7 +69,7 @@ typedef unsigned int uintptr_t;
#define LJ_MAX_UPVAL 60 /* Max. # of upvalues. */
#define LJ_MAX_IDXCHAIN 100 /* __index/__newindex chain limit. */
#define LJ_STACK_EXTRA 5 /* Extra stack space (metamethods). */
#define LJ_STACK_EXTRA (5+2*LJ_FR2) /* Extra stack space (metamethods). */
#define LJ_NUM_CBPAGE 1 /* Number of FFI callback pages. */
@@ -101,7 +103,14 @@ typedef unsigned int uintptr_t;
#define checki32(x) ((x) == (int32_t)(x))
#define checku32(x) ((x) == (uint32_t)(x))
#define checkptr32(x) ((uintptr_t)(x) == (uint32_t)(uintptr_t)(x))
#define checkptrGC(x) (checkptr32(x))
#define checkptr47(x) (((uint64_t)(x) >> 47) == 0)
#if LJ_GC64
#define checkptrGC(x) (checkptr47((x)))
#elif LJ_64
#define checkptrGC(x) (checkptr32((x)))
#else
#define checkptrGC(x) 1
#endif
/* Every half-decent C compiler transforms this into a rotate instruction. */
#define lj_rol(x, n) (((x)<<(n)) | ((x)>>(-(int)(n)&(8*sizeof(x)-1))))