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/* Copyright (C) 1999-2006 Henry Cejtin, Matthew Fluet, Suresh
* Jagannathan, and Stephen Weeks.
* Copyright (C) 1997-2000 NEC Research Institute.
*
* MLton is released under a BSD-style license.
* See the file MLton-LICENSE for details.
*/
/* getArrayLengthp (p)
*
* Returns a pointer to the length for the array pointed to by p.
*/
GC_arrayLength* getArrayLengthp (pointer a) {
return (GC_arrayLength*)(a
- GC_HEADER_SIZE
- GC_ARRAY_LENGTH_SIZE);
}
/* getArrayLength (p)
*
* Returns the length for the array pointed to by p.
*/
GC_arrayLength getArrayLength (pointer a) {
return *(getArrayLengthp (a));
}
uintmax_t GC_getArrayLength (pointer a) {
return ((uintmax_t)(getArrayLength (a)));
}
/* getArrayCounterp (p)
*
* Returns a pointer to the counter for the array pointed to by p.
*/
GC_arrayCounter* getArrayCounterp (pointer a) {
return (GC_arrayCounter*)(a
- GC_HEADER_SIZE
- GC_ARRAY_LENGTH_SIZE
- GC_ARRAY_COUNTER_SIZE);
}
/* getArrayCounter (p)
*
* Returns the counter for the array pointed to by p.
*/
GC_arrayCounter getArrayCounter (pointer a) {
return *(getArrayCounterp (a));
}
pointer indexArrayAtObjptrIndex (GC_state s, pointer a,
GC_arrayCounter arrayIndex,
uint32_t objptrIndex) {
GC_header header;
uint16_t bytesNonObjptrs;
uint16_t numObjptrs;
GC_objectTypeTag tag;
header = getHeader (a);
splitHeader(s, header, &tag, NULL, &bytesNonObjptrs, &numObjptrs);
assert (tag == ARRAY_TAG);
return a
+ (arrayIndex * (bytesNonObjptrs + (numObjptrs * OBJPTR_SIZE)))
+ bytesNonObjptrs
+ (objptrIndex * OBJPTR_SIZE);
}
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