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FFI: Add support for copy constructors.

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This commit is contained in:
Mike Pall 2012-10-08 17:14:18 +02:00
parent c681e009c0
commit da682b0e91
4 changed files with 10 additions and 6 deletions
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5
doc/ext_ffi_semantics.html
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@ -469,8 +469,9 @@ C&nbsp;type</a>.</li>
when a single initializer is given. Otherwise they are treated like
regular arrays.</li>
<li>Aggregate types (arrays and structs) accept either a single
<a href="#init_table">table initializer</a> or a flat list of
<li>Aggregate types (arrays and structs) accept either a single cdata
initializer of the same type (copy constructor), a single
<a href="#init_table">table initializer</a>, or a flat list of
initializers.</li>
<li>The elements of an array are initialized, starting at index zero.

6
src/lj_cconv.c
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@ -718,12 +718,14 @@ static void cconv_struct_init(CTState *cts, CType *d, CTSize sz, uint8_t *dp,
** This is true if an aggregate is to be initialized with a value.
** Valarrays are treated as values here so ct_tv handles (V|C, I|F).
*/
int lj_cconv_multi_init(CType *d, TValue *o)
int lj_cconv_multi_init(CTState *cts, CType *d, TValue *o)
{
if (!(ctype_isrefarray(d->info) || ctype_isstruct(d->info)))
return 0; /* Destination is not an aggregate. */
if (tvistab(o) || (tvisstr(o) && !ctype_isstruct(d->info)))
return 0; /* Initializer is not a value. */
if (tviscdata(o) && lj_ctype_rawref(cts, cdataV(o)->ctypeid) == d)
return 0; /* Source and destination are identical aggregates. */
return 1; /* Otherwise the initializer is a value. */
}
@ -733,7 +735,7 @@ void lj_cconv_ct_init(CTState *cts, CType *d, CTSize sz,
{
if (len == 0)
memset(dp, 0, sz);
else if (len == 1 && !lj_cconv_multi_init(d, o))
else if (len == 1 && !lj_cconv_multi_init(cts, d, o))
lj_cconv_ct_tv(cts, d, dp, o, 0);
else if (ctype_isarray(d->info)) /* Also handles valarray init with len>1. */
cconv_array_init(cts, d, sz, dp, o, len);

2
src/lj_cconv.h
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@ -61,7 +61,7 @@ LJ_FUNC int lj_cconv_tv_bf(CTState *cts, CType *s, TValue *o, uint8_t *sp);
LJ_FUNC void lj_cconv_ct_tv(CTState *cts, CType *d,
uint8_t *dp, TValue *o, CTInfo flags);
LJ_FUNC void lj_cconv_bf_tv(CTState *cts, CType *d, uint8_t *dp, TValue *o);
LJ_FUNC int lj_cconv_multi_init(CType *d, TValue *o);
LJ_FUNC int lj_cconv_multi_init(CTState *cts, CType *d, TValue *o);
LJ_FUNC void lj_cconv_ct_init(CTState *cts, CType *d, CTSize sz,
uint8_t *dp, TValue *o, MSize len);

3
src/lj_crecord.c
View File

@ -654,7 +654,8 @@ static void crec_alloc(jit_State *J, RecordFFData *rd, CTypeID id)
TRef trcd = emitir(IRTG(IR_CNEW, IRT_CDATA), trid, TREF_NIL);
cTValue *fin;
J->base[0] = trcd;
if (J->base[1] && !J->base[2] && !lj_cconv_multi_init(d, &rd->argv[1])) {
if (J->base[1] && !J->base[2] &&
!lj_cconv_multi_init(cts, d, &rd->argv[1])) {
goto single_init;
} else if (ctype_isarray(d->info)) {
CType *dc = ctype_rawchild(cts, d); /* Array element type. */