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gf.c
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gf.c
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/*
Generic Functions
. method table and lookup
. GF constructor, add_method
. dispatch
. static parameter inference
. method specialization, invoking type inference
*/
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#ifdef _OS_WINDOWS_
#include <malloc.h>
#endif
#include "julia.h"
#include "builtin_proto.h"
#define ENABLE_INFERENCE
// debugging options
//#define TRACE_INFERENCE
//#define JL_TRACE
//#define JL_GF_PROFILE
static jl_methtable_t *new_method_table(jl_sym_t *name)
{
jl_methtable_t *mt = (jl_methtable_t*)allocobj(sizeof(jl_methtable_t));
mt->type = (jl_value_t*)jl_methtable_type;
mt->name = name;
mt->defs = JL_NULL;
mt->cache = JL_NULL;
mt->cache_arg1 = JL_NULL;
mt->cache_targ = JL_NULL;
mt->max_args = 0;
mt->kwsorter = NULL;
#ifdef JL_GF_PROFILE
mt->ncalls = 0;
#endif
return mt;
}
static int cache_match_by_type(jl_value_t **types, size_t n, jl_tuple_t *sig,
int va)
{
if (!va && n > jl_tuple_len(sig))
return 0;
if (jl_tuple_len(sig) > n) {
if (!(n == jl_tuple_len(sig)-1 && va))
return 0;
}
size_t i;
for(i=0; i < n; i++) {
jl_value_t *decl = jl_tupleref(sig, i);
if (i == jl_tuple_len(sig)-1) {
if (va) {
jl_value_t *t = jl_tparam0(decl);
for(; i < n; i++) {
if (!jl_subtype(types[i], t, 0))
return 0;
}
return 1;
}
}
jl_value_t *a = types[i];
if (jl_is_tuple(decl)) {
// tuples don't have to match exactly, to avoid caching
// signatures for tuples of every length
if (!jl_subtype(a, decl, 0))
return 0;
}
else if (jl_is_datatype(a) && jl_is_datatype(decl) &&
((jl_datatype_t*)decl)->name == jl_type_type->name &&
((jl_datatype_t*)a )->name == jl_type_type->name) {
jl_value_t *tp0 = jl_tparam0(decl);
if (tp0 == (jl_value_t*)jl_typetype_tvar) {
// in the case of Type{T}, the types don't have
// to match exactly either. this is cached as Type{T}.
// analogous to the situation with tuples.
}
else {
if (!jl_types_equal(jl_tparam0(a), tp0))
return 0;
}
}
else if (decl == (jl_value_t*)jl_any_type) {
}
else {
if (!jl_types_equal(a, decl))
return 0;
}
}
return 1;
}
static inline int cache_match(jl_value_t **args, size_t n, jl_tuple_t *sig,
int va, size_t lensig)
{
// NOTE: This function is a huge performance hot spot!!
for(size_t i=0; i < n; i++) {
jl_value_t *decl = jl_tupleref(sig, i);
if (i == lensig-1) {
if (va) {
jl_value_t *t = jl_tparam0(decl);
for(; i < n; i++) {
if (!jl_subtype(args[i], t, 1))
return 0;
}
return 1;
}
}
jl_value_t *a = args[i];
if (decl == (jl_value_t*)jl_any_type) {
}
else if ((jl_value_t*)jl_typeof(a) == decl) {
/*
we know there are only concrete types here, and types are
hash-consed, so pointer comparison should work.
*/
}
else if (jl_is_tuple(decl)) {
// tuples don't have to match exactly, to avoid caching
// signatures for tuples of every length
if (!jl_is_tuple(a) || //!jl_subtype(a, decl, 1))
!jl_tuple_subtype(((jl_tuple_t*)a)->data, jl_tuple_len(a),
((jl_tuple_t*)decl)->data, jl_tuple_len(decl),
1, 0))
return 0;
}
else if (jl_is_type_type(decl) &&
(jl_is_nontuple_type(a) ||
(jl_is_tuple(a)&&jl_is_type(a)))) {
jl_value_t *tp0 = jl_tparam0(decl);
if (tp0 == (jl_value_t*)jl_typetype_tvar) {
// in the case of Type{T}, the types don't have
// to match exactly either. this is cached as Type{T}.
// analogous to the situation with tuples.
}
else {
if (a!=tp0 && !jl_types_equal(a,tp0))
return 0;
}
}
else {
return 0;
}
}
return 1;
}
static inline
jl_methlist_t *mtcache_hash_lookup(jl_array_t *a, jl_value_t *ty, int tparam)
{
uptrint_t uid = ((jl_datatype_t*)ty)->uid;
jl_methlist_t *ml = (jl_methlist_t*)jl_cellref(a, uid & (a->nrows-1));
if (ml && ml!=JL_NULL) {
jl_value_t *t = jl_tupleref(ml->sig, 0);
if (tparam) t = jl_tparam0(t);
if (t == ty)
return ml;
}
return JL_NULL;
}
static void mtcache_rehash(jl_array_t **pa)
{
size_t len = (*pa)->nrows;
jl_value_t **d = (jl_value_t**)(*pa)->data;
jl_array_t *n = jl_alloc_cell_1d(len*2);
jl_value_t **nd = (jl_value_t**)n->data;
size_t i;
for(i=0; i < len; i++) {
jl_methlist_t *ml = (jl_methlist_t*)d[i];
if (ml && ml!=JL_NULL) {
jl_value_t *t = jl_tupleref(ml->sig,0);
if (jl_is_type_type(t))
t = jl_tparam0(t);
uptrint_t uid = ((jl_datatype_t*)t)->uid;
nd[uid & (len*2-1)] = (jl_value_t*)ml;
}
}
*pa = n;
}
static jl_methlist_t **mtcache_hash_bp(jl_array_t **pa, jl_value_t *ty,
int tparam)
{
uptrint_t uid;
if (jl_is_datatype(ty) && (uid = ((jl_datatype_t*)ty)->uid)) {
while (1) {
jl_methlist_t **pml = (jl_methlist_t**)&jl_cellref(*pa, uid & ((*pa)->nrows-1));
if (*pml == NULL || *pml == JL_NULL) {
*pml = JL_NULL;
return pml;
}
jl_value_t *t = jl_tupleref((*pml)->sig,0);
if (tparam) t = jl_tparam0(t);
if (t == ty)
return pml;
mtcache_rehash(pa);
}
}
return NULL;
}
/*
Method caches are divided into three parts: one for signatures where
the first argument is a singleton kind (Type{Foo}), one indexed by the
UID of the first argument's type in normal cases, and a fallback
table of everything else.
*/
static jl_function_t *jl_method_table_assoc_exact_by_type(jl_methtable_t *mt,
jl_tuple_t *types)
{
jl_methlist_t *ml = JL_NULL;
if (jl_tuple_len(types) > 0) {
jl_value_t *ty = jl_t0(types);
if (jl_is_type_type(ty)) {
jl_value_t *a0 = jl_tparam0(ty);
if (mt->cache_targ != JL_NULL && jl_is_datatype(a0)) {
ml = mtcache_hash_lookup(mt->cache_targ, a0, 1);
if (ml!=JL_NULL)
goto mt_assoc_bt_lkup;
}
}
if (mt->cache_arg1 != JL_NULL && jl_is_datatype(ty)) {
ml = mtcache_hash_lookup(mt->cache_arg1, ty, 0);
}
}
if (ml == JL_NULL)
ml = mt->cache;
mt_assoc_bt_lkup:
while (ml != JL_NULL) {
if (cache_match_by_type(&jl_tupleref(types,0), jl_tuple_len(types),
(jl_tuple_t*)ml->sig, ml->va)) {
return ml->func;
}
ml = ml->next;
}
return jl_bottom_func;
}
static jl_function_t *jl_method_table_assoc_exact(jl_methtable_t *mt,
jl_value_t **args, size_t n)
{
// NOTE: This function is a huge performance hot spot!!
jl_methlist_t *ml = JL_NULL;
if (n > 0) {
jl_value_t *a0 = args[0];
jl_value_t *ty = (jl_value_t*)jl_typeof(a0);
if (mt->cache_targ != JL_NULL && ty == (jl_value_t*)jl_datatype_type) {
ml = mtcache_hash_lookup(mt->cache_targ, a0, 1);
if (ml != JL_NULL)
goto mt_assoc_lkup;
}
if (mt->cache_arg1 != JL_NULL && jl_is_datatype(ty)) {
ml = mtcache_hash_lookup(mt->cache_arg1, ty, 0);
if (ml != JL_NULL) {
if (ml->next==JL_NULL && n==1 && jl_tuple_len(ml->sig)==1)
return ml->func;
if (n==2) {
// some manually-unrolled common special cases
jl_value_t *a1 = args[1];
jl_methlist_t *mn = ml;
if (jl_tuple_len(mn->sig)==2 &&
jl_tupleref(mn->sig,1)==(jl_value_t*)jl_typeof(a1))
return mn->func;
mn = mn->next;
if (mn!=JL_NULL && jl_tuple_len(mn->sig)==2 &&
jl_tupleref(mn->sig,1)==(jl_value_t*)jl_typeof(a1))
return mn->func;
}
}
}
}
if (ml == JL_NULL)
ml = mt->cache;
mt_assoc_lkup:
while (ml != JL_NULL) {
size_t lensig = jl_tuple_len(ml->sig);
if ((lensig == n || ml->va) &&
!(lensig > n && n != lensig-1)) {
if (cache_match(args, n, (jl_tuple_t*)ml->sig, ml->va, lensig)) {
return ml->func;
}
}
ml = ml->next;
}
return jl_bottom_func;
}
// return a new lambda-info that has some extra static parameters
// merged in.
jl_lambda_info_t *jl_add_static_parameters(jl_lambda_info_t *l, jl_tuple_t *sp)
{
JL_GC_PUSH1(&sp);
if (jl_tuple_len(l->sparams) > 0)
sp = jl_tuple_append(sp, l->sparams);
jl_lambda_info_t *nli = jl_new_lambda_info(l->ast, sp);
nli->name = l->name;
nli->fptr = l->fptr;
nli->module = l->module;
nli->file = l->file;
nli->line = l->line;
nli->def = l->def;
JL_GC_POP();
return nli;
}
JL_CALLABLE(jl_trampoline);
jl_function_t *jl_instantiate_method(jl_function_t *f, jl_tuple_t *sp)
{
if (f->linfo == NULL)
return f;
jl_function_t *nf = jl_new_closure(f->fptr, f->env, NULL);
JL_GC_PUSH1(&nf);
nf->linfo = jl_add_static_parameters(f->linfo, sp);
JL_GC_POP();
return nf;
}
// make a new method that calls the generated code from the given linfo
jl_function_t *jl_reinstantiate_method(jl_function_t *f, jl_lambda_info_t *li)
{
return jl_new_closure(NULL, f->env, li);
}
static
jl_methlist_t *jl_method_list_insert(jl_methlist_t **pml, jl_tuple_t *type,
jl_function_t *method, jl_tuple_t *tvars,
int check_amb);
static
jl_function_t *jl_method_cache_insert(jl_methtable_t *mt, jl_tuple_t *type,
jl_function_t *method)
{
jl_methlist_t **pml = &mt->cache;
if (jl_tuple_len(type) > 0) {
jl_value_t *t0 = jl_t0(type);
uptrint_t uid=0;
// if t0 != jl_typetype_type and the argument is Type{...}, this
// method has specializations for singleton kinds and we use
// the table indexed for that purpose.
if (t0 != (jl_value_t*)jl_typetype_type && jl_is_type_type(t0)) {
jl_value_t *a0 = jl_tparam0(t0);
if (jl_is_datatype(a0))
uid = ((jl_datatype_t*)a0)->uid;
if (uid > 0) {
if (mt->cache_targ == JL_NULL)
mt->cache_targ = jl_alloc_cell_1d(16);
pml = mtcache_hash_bp(&mt->cache_targ, a0, 1);
goto ml_do_insert;
}
}
if (jl_is_datatype(t0))
uid = ((jl_datatype_t*)t0)->uid;
if (uid > 0) {
if (mt->cache_arg1 == JL_NULL)
mt->cache_arg1 = jl_alloc_cell_1d(16);
pml = mtcache_hash_bp(&mt->cache_arg1, t0, 0);
}
}
ml_do_insert:
return jl_method_list_insert(pml, type, method, jl_null, 0)->func;
}
static void print_tuple_elts(JL_STREAM *s, jl_tuple_t *v)
{
for(size_t i=0; i < jl_tuple_len(v); i++) {
if (i > 0) JL_PRINTF(s, ", ");
jl_debug_print_type(s, jl_tupleref(v,i));
}
}
void jl_debug_print_type(JL_STREAM *s, jl_value_t *v)
{
if (jl_is_tuple(v)) {
JL_PUTC('(', s);
print_tuple_elts(s, (jl_tuple_t*)v);
JL_PUTC(')', s);
}
else if (jl_is_symbol(v)) {
JL_PRINTF(s, "%s", ((jl_sym_t*)v)->name);
}
else if (jl_is_long(v)) {
JL_PRINTF(s, "%lld", jl_unbox_long(v));
}
else if (jl_is_datatype(v)) {
jl_datatype_t *dt = (jl_datatype_t*)v;
JL_PRINTF(s, "%s", dt->name->name->name);
if (jl_tuple_len(dt->parameters) > 0) {
JL_PUTC('{', s);
print_tuple_elts(s, dt->parameters);
JL_PUTC('}', s);
}
}
else if (jl_is_typector(v)) {
jl_debug_print_type(s, ((jl_typector_t*)v)->body);
}
else if (jl_is_uniontype(v)) {
JL_PRINTF(s, "Union");
jl_debug_print_type(s, (jl_value_t*)((jl_uniontype_t*)v)->types);
}
else if (jl_is_typevar(v)) {
JL_PRINTF(s, ((jl_tvar_t*)v)->name->name);
}
else {
JL_PRINTF(s, "<Unknown Type>");
}
}
extern jl_function_t *jl_typeinf_func;
/*
run type inference on lambda "li" in-place, for given argument types.
"def" is the original method definition of which this is an instance;
can be equal to "li" if not applicable.
*/
int jl_in_inference = 0;
void jl_type_infer(jl_lambda_info_t *li, jl_tuple_t *argtypes,
jl_lambda_info_t *def)
{
int last_ii = jl_in_inference;
jl_in_inference = 1;
if (jl_typeinf_func != NULL) {
// TODO: this should be done right before code gen, so if it is
// interrupted we can try again the next time the function is
// called
assert(li->inInference == 0);
li->inInference = 1;
jl_value_t *fargs[4];
fargs[0] = (jl_value_t*)li;
fargs[1] = (jl_value_t*)argtypes;
fargs[2] = (jl_value_t*)jl_null;
fargs[3] = (jl_value_t*)def;
#ifdef TRACE_INFERENCE
JL_PRINTF(JL_STDERR,"inference on %s", li->name->name);
jl_debug_print_type(JL_STDERR, (jl_value_t*)argtypes);
JL_PRINTF(JL_STDERR, "\n");
#endif
#ifdef ENABLE_INFERENCE
jl_value_t *newast = jl_apply(jl_typeinf_func, fargs, 4);
li->ast = jl_tupleref(newast, 0);
li->inferred = 1;
#endif
li->inInference = 0;
}
jl_in_inference = last_ii;
}
static jl_value_t *nth_slot_type(jl_tuple_t *sig, size_t i)
{
size_t len = jl_tuple_len(sig);
if (len == 0)
return NULL;
if (i < len-1)
return jl_tupleref(sig, i);
if (jl_is_vararg_type(jl_tupleref(sig,len-1))) {
return jl_tparam0(jl_tupleref(sig,len-1));
}
if (i == len-1)
return jl_tupleref(sig, i);
return NULL;
}
static int very_general_type(jl_value_t *t)
{
return (t && (t==(jl_value_t*)jl_any_type ||
(jl_is_typevar(t) &&
((jl_tvar_t*)t)->ub==(jl_value_t*)jl_any_type)));
}
static int tuple_all_Any(jl_tuple_t *t)
{
for(int i=0; i < jl_tuple_len(t); i++) {
if (jl_tupleref(t,i) != (jl_value_t*)jl_any_type)
return 0;
}
return 1;
}
static int is_kind(jl_value_t *v)
{
return (v==(jl_value_t*)jl_uniontype_type ||
v==(jl_value_t*)jl_datatype_type ||
v==(jl_value_t*)jl_typector_type);
}
static jl_value_t *ml_matches(jl_methlist_t *ml, jl_value_t *type,
jl_sym_t *name, int lim);
static jl_function_t *cache_method(jl_methtable_t *mt, jl_tuple_t *type,
jl_function_t *method, jl_tuple_t *decl,
jl_tuple_t *sparams)
{
size_t i;
int need_guard_entries = 0;
jl_value_t *temp=NULL;
jl_function_t *newmeth=NULL;
JL_GC_PUSH3(&type, &temp, &newmeth);
for (i=0; i < jl_tuple_len(type); i++) {
jl_value_t *elt = jl_tupleref(type,i);
jl_value_t *decl_i = nth_slot_type(decl,i);
if (jl_is_type_type(elt) && jl_is_tuple(jl_tparam0(elt)) &&
!jl_is_type_type(decl_i)) {
jl_methlist_t *curr = mt->defs;
int ok=1;
while (curr != JL_NULL) {
jl_value_t *slottype = nth_slot_type(curr->sig, i);
if (slottype && curr->func!=method) {
if (jl_is_type_type(slottype) &&
jl_type_intersection(slottype, decl_i) != jl_bottom_type) {
ok=0;
break;
}
}
curr = curr->next;
}
if (ok) {
elt = jl_full_type(jl_tparam0(elt));
jl_tupleset(type, i, elt);
}
}
int set_to_any = 0;
if (decl_i == jl_ANY_flag) {
// don't specialize on slots marked ANY
temp = jl_tupleref(type, i);
jl_tupleset(type, i, (jl_value_t*)jl_any_type);
int nintr=0;
jl_methlist_t *curr = mt->defs;
// if this method is the only match even with the current slot
// set to Any, then it is safe to cache it that way.
while (curr != JL_NULL && curr->func!=method) {
if (jl_type_intersection((jl_value_t*)curr->sig,
(jl_value_t*)type) !=
(jl_value_t*)jl_bottom_type) {
nintr++;
break;
}
curr = curr->next;
}
if (nintr) {
// TODO: even if different specializations of this slot need
// separate cache entries, have them share code.
jl_tupleset(type, i, temp);
}
else {
set_to_any = 1;
}
}
if (set_to_any) {
}
else if (jl_is_tuple(elt)) {
/*
don't cache tuple type exactly; just remember that it was
a tuple, unless the declaration asks for something more
specific. determined with a type intersection.
*/
int might_need_guard=0;
temp = jl_tupleref(type, i);
if (i < jl_tuple_len(decl)) {
jl_value_t *declt = jl_tupleref(decl,i);
// for T..., intersect with T
if (jl_is_vararg_type(declt))
declt = jl_tparam0(declt);
if (declt == (jl_value_t*)jl_tuple_type ||
jl_subtype((jl_value_t*)jl_tuple_type, declt, 0)) {
// don't specialize args that matched (Any...) or Any
jl_tupleset(type, i, (jl_value_t*)jl_tuple_type);
might_need_guard = 1;
}
else {
declt = jl_type_intersection(declt,
(jl_value_t*)jl_tuple_type);
if (jl_tuple_len(elt) > 3 ||
tuple_all_Any((jl_tuple_t*)declt)) {
jl_tupleset(type, i, declt);
might_need_guard = 1;
}
}
}
else {
jl_tupleset(type, i, (jl_value_t*)jl_tuple_type);
might_need_guard = 1;
}
assert(jl_tupleref(type,i) != (jl_value_t*)jl_bottom_type);
if (might_need_guard) {
jl_methlist_t *curr = mt->defs;
// can't generalize type if there's an overlapping definition
// with typevars.
// TODO: it seems premature to take these intersections
// before the whole signature has been generalized.
// example ((T...,),S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,S,...)
while (curr != JL_NULL && curr->func!=method) {
if (curr->tvars!=jl_null &&
jl_type_intersection((jl_value_t*)curr->sig,
(jl_value_t*)type) !=
(jl_value_t*)jl_bottom_type) {
jl_tupleset(type, i, temp);
might_need_guard = 0;
break;
}
curr = curr->next;
}
}
if (might_need_guard) {
jl_methlist_t *curr = mt->defs;
while (curr != JL_NULL && curr->func!=method) {
jl_tuple_t *sig = curr->sig;
if (jl_tuple_len(sig) > i &&
jl_is_tuple(jl_tupleref(sig,i))) {
need_guard_entries = 1;
break;
}
curr = curr->next;
}
}
}
else if (jl_is_type_type(elt) && jl_is_type_type(jl_tparam0(elt)) &&
(decl_i==NULL || !jl_has_typevars(decl_i))) {
/*
actual argument was Type{...}, we computed its type as
Type{Type{...}}. we must avoid unbounded nesting here, so
cache the signature as Type{T}, unless something more
specific like Type{Type{Int32}} was actually declared.
this can be determined using a type intersection.
*/
if (i < jl_tuple_len(decl)) {
jl_value_t *declt = jl_tupleref(decl,i);
// for T..., intersect with T
if (jl_is_vararg_type(declt))
declt = jl_tparam0(declt);
jl_tupleset(type, i,
jl_type_intersection(declt, (jl_value_t*)jl_typetype_type));
}
else {
jl_tupleset(type, i, (jl_value_t*)jl_typetype_type);
}
assert(jl_tupleref(type,i) != (jl_value_t*)jl_bottom_type);
}
else if (jl_is_type_type(elt) && very_general_type(decl_i) &&
!jl_has_typevars(decl_i)) {
/*
here's a fairly complex heuristic: if this argument slot's
declared type is Any, and no definition overlaps with Type
for this slot, then don't specialize for every Type that
might be passed.
Since every type x has its own type Type{x}, this would be
excessive specialization for an Any slot.
TypeConstructors are problematic because they can be alternate
representations of any type. Extensionally, TC == TC.body, but
typeof(TC) != typeof(TC.body). This creates an ambiguity:
Type{TC} is type-equal to Type{TC.body}, yet a slot
x::TypeConstructor matches the first but not the second, while
also matching all other TypeConstructors. This means neither
Type{TC} nor TypeConstructor is more specific.
To solve this, we identify "kind slots", which are slots
for which some definition specifies a kind (e.g. DataType).
Those tend to be in reflective functions that look at types
themselves. For these slots we specialize on jl_typeof(T) instead
of Type{T}, i.e. the kind of the type rather than the specific
type.
*/
int ok=1, kindslot=0;
jl_methlist_t *curr = mt->defs;
jl_value_t *kind = (jl_value_t*)jl_full_type(jl_tparam0(elt));
while (curr != JL_NULL) {
jl_value_t *slottype = nth_slot_type(curr->sig, i);
if (slottype && curr->func!=method) {
if (slottype == kind) {
ok=0;
break;
}
if (is_kind(slottype))
kindslot=1;
}
curr = curr->next;
}
if (ok) {
if (kindslot) {
jl_tupleset(type, i, kind);
}
else {
curr = mt->defs;
while (curr != JL_NULL) {
jl_value_t *slottype = nth_slot_type(curr->sig, i);
if (slottype && curr->func!=method) {
if (!very_general_type(slottype) &&
jl_type_intersection(slottype, (jl_value_t*)jl_type_type) !=
(jl_value_t*)jl_bottom_type) {
ok=0;
break;
}
}
curr = curr->next;
}
if (ok) {
jl_tupleset(type, i, jl_typetype_type);
}
}
}
}
else if (is_kind(decl_i)) {
// if a slot is specialized for a particular kind, it can be
// considered a reflective method and so only needs to be
// specialized for type representation, not type extent.
jl_methlist_t *curr = mt->defs;
int ok=1;
while (curr != JL_NULL) {
jl_value_t *slottype = nth_slot_type(curr->sig, i);
if (slottype && curr->func!=method) {
if (jl_is_type_type(slottype) &&
jl_type_intersection(slottype, decl_i) != jl_bottom_type) {
ok=0;
break;
}
}
curr = curr->next;
}
if (ok)
jl_tupleset(type, i, decl_i);
}
}
// for varargs methods, only specialize up to max_args.
// in general, here we want to find the biggest type that's not a
// supertype of any other method signatures. so far we are conservative
// and the types we find should be bigger.
if (jl_tuple_len(type) > mt->max_args &&
jl_is_vararg_type(jl_tupleref(decl,jl_tuple_len(decl)-1))) {
size_t nspec = mt->max_args + 2;
jl_tuple_t *limited = jl_alloc_tuple(nspec);
for(i=0; i < nspec-1; i++) {
jl_tupleset(limited, i, jl_tupleref(type, i));
}
jl_value_t *lasttype = jl_tupleref(type,i-1);
// if all subsequent arguments are subtypes of lasttype, specialize
// on that instead of decl. for example, if decl is
// (Any...)
// and type is
// (Symbol, Symbol, Symbol)
// then specialize as (Symbol...), but if type is
// (Symbol, Int32, Expr)
// then specialize as (Any...)
size_t j = i;
int all_are_subtypes=1;
for(; j < jl_tuple_len(type); j++) {
if (!jl_subtype(jl_tupleref(type,j), lasttype, 0)) {
all_are_subtypes = 0;
break;
}
}
type = limited;
if (all_are_subtypes) {
// avoid Type{Type{...}...}...
if (jl_is_type_type(lasttype) && jl_is_type_type(jl_tparam0(lasttype)))
lasttype = (jl_value_t*)jl_type_type;
temp = (jl_value_t*)jl_tuple1(lasttype);
jl_tupleset(type, i, jl_apply_type((jl_value_t*)jl_vararg_type,
(jl_tuple_t*)temp));
}
else {
jl_value_t *lastdeclt = jl_tupleref(decl,jl_tuple_len(decl)-1);
if (jl_tuple_len(sparams) > 0) {
lastdeclt = (jl_value_t*)
jl_instantiate_type_with((jl_value_t*)lastdeclt,
sparams->data,
jl_tuple_len(sparams)/2);
}
jl_tupleset(type, i, lastdeclt);
}
// now there is a problem: the computed signature is more
// general than just the given arguments, so it might conflict
// with another definition that doesn't have cache instances yet.
// to fix this, we insert guard cache entries for all intersections
// of this signature and definitions. those guard entries will
// supersede this one in conflicted cases, alerting us that there
// should actually be a cache miss.
need_guard_entries = 1;
}
if (need_guard_entries) {
temp = ml_matches(mt->defs, (jl_value_t*)type, lambda_sym, -1);
for(i=0; i < jl_array_len(temp); i++) {
jl_value_t *m = jl_cellref(temp, i);
if (jl_tupleref(m,2) != (jl_value_t*)method->linfo) {
jl_method_cache_insert(mt, (jl_tuple_t*)jl_tupleref(m, 0),
jl_bottom_func);
}
}
}
// here we infer types and specialize the method
/*
if (sparams==jl_null)
newmeth = method;
else
*/
jl_array_t *lilist=NULL;
jl_lambda_info_t *li=NULL;
if (method->linfo && method->linfo->specializations!=NULL) {
// reuse code already generated for this combination of lambda and
// arguments types. this happens for inner generic functions where
// a new closure is generated on each call to the enclosing function.
lilist = method->linfo->specializations;
int k;
for(k=0; k < lilist->nrows; k++) {
li = (jl_lambda_info_t*)jl_cellref(lilist, k);
if (jl_types_equal((jl_value_t*)li->specTypes, (jl_value_t*)type))
break;
}
if (k == lilist->nrows) lilist=NULL;
}
if (lilist != NULL && !li->inInference) {
assert(li);
newmeth = jl_reinstantiate_method(method, li);
(void)jl_method_cache_insert(mt, type, newmeth);
JL_GC_POP();
return newmeth;
}
else {
newmeth = jl_instantiate_method(method, sparams);
}
/*
if "method" itself can ever be compiled, for example for use as
an unspecialized method (see below), then newmeth->fptr might point
to some slow compiled code instead of jl_trampoline, meaning our
type-inferred code would never get compiled. this can be fixed with
the commented-out snippet below.
*/
assert(!(newmeth->linfo && newmeth->linfo->ast) ||
newmeth->fptr == &jl_trampoline);
/*
if (newmeth->linfo&&newmeth->linfo->ast&&newmeth->fptr!=&jl_trampoline) {
newmeth->fptr = &jl_trampoline;
}
*/
(void)jl_method_cache_insert(mt, type, newmeth);
if (newmeth->linfo != NULL && newmeth->linfo->sparams == jl_null) {
// when there are no static parameters, one unspecialized version
// of a function can be shared among all cached specializations.
if (method->linfo->unspecialized == NULL) {
method->linfo->unspecialized =
jl_instantiate_method(method, jl_null);
}
newmeth->linfo->unspecialized = method->linfo->unspecialized;
}
if (newmeth->linfo != NULL && newmeth->linfo->ast != NULL) {
newmeth->linfo->specTypes = type;
jl_array_t *spe = method->linfo->specializations;
if (spe == NULL) {
spe = jl_alloc_cell_1d(1);
jl_cellset(spe, 0, newmeth->linfo);
}
else {
jl_cell_1d_push(spe, (jl_value_t*)newmeth->linfo);
}
method->linfo->specializations = spe;
jl_type_infer(newmeth->linfo, type, method->linfo);
}
JL_GC_POP();
return newmeth;
}
static jl_value_t *lookup_match(jl_value_t *a, jl_value_t *b, jl_tuple_t **penv,
jl_tuple_t *tvars)
{
jl_value_t *ti = jl_type_intersection_matching(a, b, penv, tvars);
if (ti == (jl_value_t*)jl_bottom_type)
return ti;
assert(jl_is_tuple(*penv));
jl_value_t **ee = alloca(sizeof(void*) * jl_tuple_len(*penv));
int n=0;
// only keep vars in tvars list
jl_value_t **tvs;
int tvarslen;
if (jl_is_typevar(tvars)) {
tvs = (jl_value_t**)&tvars;
tvarslen = 1;
}
else {
tvs = &jl_t0(tvars);
tvarslen = jl_tuple_len(tvars);
}
for(int i=0; i < jl_tuple_len(*penv); i+=2) {
jl_value_t *v = jl_tupleref(*penv,i);
jl_value_t *val = jl_tupleref(*penv,i+1);
for(int j=0; j < tvarslen; j++) {
if (v == tvs[j]) {
ee[n++] = v;
ee[n++] = val;
}
}
}
if (n != jl_tuple_len(*penv)) {
jl_tuple_t *en = jl_alloc_tuple_uninit(n);
memcpy(en->data, ee, n*sizeof(void*));
*penv = en;
}
return ti;
}
static jl_function_t *jl_mt_assoc_by_type(jl_methtable_t *mt, jl_tuple_t *tt, int cache, int inexact)
{
jl_methlist_t *m = mt->defs;
size_t nargs = jl_tuple_len(tt);
size_t i;
jl_value_t *ti=(jl_value_t*)jl_bottom_type;
jl_tuple_t *newsig=NULL, *env = jl_null;
JL_GC_PUSH2(&env, &newsig);
while (m != JL_NULL) {
if (m->tvars!=jl_null) {
ti = lookup_match((jl_value_t*)tt, (jl_value_t*)m->sig,
&env, m->tvars);
if (ti != (jl_value_t*)jl_bottom_type) {
// parametric methods only match if all typevars are matched by
// non-typevars.
for(i=1; i < jl_tuple_len(env); i+=2) {
if (jl_is_typevar(jl_tupleref(env,i))) {
if (inexact) {
// "inexact" means the given type is compile-time,
// where a failure to determine the value of a
// static parameter is inconclusive.
// this is issue #3182, see test/core.jl
return jl_bottom_func;
}
break;
}
}
if (i >= jl_tuple_len(env))
break;
ti = (jl_value_t*)jl_bottom_type;
}
}
else if (jl_tuple_subtype(&jl_tupleref(tt,0), nargs,
&jl_tupleref(m->sig,0),
jl_tuple_len(m->sig), 0, 0)) {
break;
}
m = m->next;
}
if (ti == (jl_value_t*)jl_bottom_type) {
JL_GC_POP();
if (m != JL_NULL) {
if (!cache)
return m->func;
return cache_method(mt, tt, m->func, (jl_tuple_t*)m->sig, jl_null);
}
return jl_bottom_func;
}
assert(jl_is_tuple(env));
// don't bother computing this if no arguments are tuples
for(i=0; i < jl_tuple_len(tt); i++) {
if (jl_is_tuple(jl_tupleref(tt,i)))
break;
}
if (i < jl_tuple_len(tt)) {
newsig = (jl_tuple_t*)jl_instantiate_type_with((jl_value_t*)m->sig,
&jl_tupleref(env,0),
jl_tuple_len(env)/2);
}
else {
newsig = (jl_tuple_t*)m->sig;
}
assert(jl_is_tuple(newsig));
jl_function_t *nf;
if (!cache)
nf = m->func;
else
nf = cache_method(mt, tt, m->func, newsig, env);
JL_GC_POP();
return nf;
}
jl_datatype_t *jl_wrap_Type(jl_value_t *t);
static int sigs_eq(jl_value_t *a, jl_value_t *b, int useenv)
{
if (jl_has_typevars(a) || jl_has_typevars(b)) {
return jl_types_equal_generic(a,b,useenv);
}
return jl_subtype(a, b, 0) && jl_subtype(b, a, 0);
}
int jl_args_morespecific(jl_value_t *a, jl_value_t *b)
{
int msp = jl_type_morespecific(a,b,0);
if (jl_has_typevars(b)) {
if (jl_type_match_morespecific(a,b) == (jl_value_t*)jl_false) {
if (jl_has_typevars(a))