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Added the alloc_string macro

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This allows allocation of a string using either the stack for small strings or our GC'd heap if the string exceeds the maximum stack size.
This commit is contained in:
Justin Ethier 2018-01-01 18:48:04 -05:00
parent 5e3244fa9d
commit e95f29aaf8
1 changed files with 27 additions and 0 deletions
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27
include/cyclone/types.h
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@ -808,6 +808,33 @@ typedef struct {
cs.num_cp = length; \
cs.str = s; }
/**
* Allocate a new string, either on the stack or heap depending upon size
*/
#define alloc_string(_data, _s, _len, _num_cp) \
if (_len >= MAX_STACK_OBJ) { \
int heap_grown; \
_s = gc_alloc(((gc_thread_data *)data)->heap, \
sizeof(string_type) + _len + 1, \
boolean_f, /* OK to populate manually over here */ \
(gc_thread_data *)data, \
&heap_grown); \
((string_type *) _s)->hdr.mark = ((gc_thread_data *)data)->gc_alloc_color; \
((string_type *) _s)->hdr.grayed = 0; \
((string_type *) _s)->tag = string_tag; \
((string_type *) _s)->len = _len; \
((string_type *) _s)->num_cp = _num_cp; \
((string_type *) _s)->str = (((char *)_s) + sizeof(string_type)); \
} else { \
_s = alloca(sizeof(string_type)); \
((string_type *)_s)->hdr.mark = gc_color_red; \
((string_type *)_s)->hdr.grayed = 0; \
((string_type *)_s)->tag = string_tag; \
((string_type *)_s)->len = _len; \
((string_type *)_s)->num_cp = _num_cp; \
((string_type *)_s)->str = alloca(sizeof(char) * (_len + 1)); \
}
/** Get the length of a string, in characters (code points) */
#define string_num_cp(x) (((string_type *) x)->num_cp)