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gf.c
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gf.c
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// This file is a part of Julia. License is MIT: https://julialang.org/license
/*
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 "julia_internal.h"
#ifdef __cplusplus
extern "C" {
#endif
static jl_value_t *jl_apply_unspecialized(jl_function_t *meth, jl_value_t **args, uint32_t nargs)
{
jl_function_t *unspecialized = meth->linfo->unspecialized;
assert(unspecialized != jl_bottom_func);
if (meth->env == (jl_value_t*)jl_emptysvec) {
return jl_apply(unspecialized, args, nargs);
}
else {
jl_function_t *closuremeth = jl_new_closure(unspecialized->fptr, meth->env, unspecialized->linfo);
JL_GC_PUSH1(&closuremeth);
jl_value_t *v = jl_apply(closuremeth, args, nargs);
JL_GC_POP();
return v;
}
}
static jl_methtable_t *new_method_table(jl_sym_t *name)
{
jl_methtable_t *mt = (jl_methtable_t*)allocobj(sizeof(jl_methtable_t));
jl_set_typeof(mt, jl_methtable_type);
mt->name = name;
mt->defs = (jl_methlist_t*)jl_nothing;
mt->cache = (jl_methlist_t*)jl_nothing;
mt->cache_arg1 = (jl_array_t*)jl_nothing;
mt->cache_targ = (jl_array_t*)jl_nothing;
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_tupletype_t *sig, int va)
{
if (!va && n > jl_datatype_nfields(sig))
return 0;
if (jl_datatype_nfields(sig) > n) {
if (!(n == jl_datatype_nfields(sig)-1 && va))
return 0;
}
size_t i;
for(i=0; i < n; i++) {
jl_value_t *decl = jl_field_type(sig, i);
if (i == jl_datatype_nfields(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_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_tupletype_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_field_type(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_type_type(decl) && 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!=(void*)jl_nothing) {
jl_value_t *t = jl_field_type(ml->sig, 0);
if (tparam) t = jl_tparam0(t);
if (t == ty)
return ml;
}
return (jl_methlist_t*)jl_nothing;
}
static void mtcache_rehash(jl_array_t **pa, jl_value_t* parent)
{
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_methlist_t*)jl_nothing) {
jl_value_t *t = jl_field_type(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;
}
}
gc_wb(parent, n);
*pa = n;
}
static jl_methlist_t **mtcache_hash_bp(jl_array_t **pa, jl_value_t *ty,
int tparam, jl_value_t* parent)
{
uptrint_t uid;
if (jl_is_datatype(ty) && (uid = ((jl_datatype_t*)ty)->uid)) {
while (1) {
jl_methlist_t **pml = &((jl_methlist_t**)jl_array_data(*pa))[uid & ((*pa)->nrows-1)];
if (*pml == NULL || *pml == (jl_methlist_t*)jl_nothing) {
*pml = (jl_methlist_t*)jl_nothing;
return pml;
}
jl_value_t *t = jl_field_type((*pml)->sig,0);
if (tparam) t = jl_tparam0(t);
if (t == ty)
return pml;
mtcache_rehash(pa, parent);
}
}
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_tupletype_t *types)
{
jl_methlist_t *ml = (jl_methlist_t*)jl_nothing;
if (jl_datatype_nfields(types) > 0) {
jl_value_t *ty = jl_tparam0(types);
if (jl_is_type_type(ty)) {
jl_value_t *a0 = jl_tparam0(ty);
if (mt->cache_targ != (void*)jl_nothing && jl_is_datatype(a0)) {
ml = mtcache_hash_lookup(mt->cache_targ, a0, 1);
if (ml!=(jl_methlist_t*)jl_nothing)
goto mt_assoc_bt_lkup;
}
}
if (mt->cache_arg1 != (void*)jl_nothing && jl_is_datatype(ty)) {
ml = mtcache_hash_lookup(mt->cache_arg1, ty, 0);
}
}
if (ml == (void*)jl_nothing)
ml = mt->cache;
mt_assoc_bt_lkup:
while (ml != (void*)jl_nothing) {
if (cache_match_by_type(jl_svec_data(types->parameters), jl_datatype_nfields(types),
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_methlist_t*)jl_nothing;
if (n > 0) {
jl_value_t *a0 = args[0];
jl_value_t *ty = (jl_value_t*)jl_typeof(a0);
if (mt->cache_targ != (void*)jl_nothing && ty == (jl_value_t*)jl_datatype_type) {
ml = mtcache_hash_lookup(mt->cache_targ, a0, 1);
if (ml != (void*)jl_nothing)
goto mt_assoc_lkup;
}
assert(jl_is_datatype(ty));
if (mt->cache_arg1 != (void*)jl_nothing) {
ml = mtcache_hash_lookup(mt->cache_arg1, ty, 0);
if (ml != (void*)jl_nothing) {
if (ml->next==(void*)jl_nothing && n==1 && jl_datatype_nfields(ml->sig)==1)
return ml->func;
if (n==2) {
// some manually-unrolled common special cases
jl_value_t *a1 = args[1];
if (!jl_is_tuple(a1)) { // issue #6426
jl_methlist_t *mn = ml;
if (jl_datatype_nfields(mn->sig)==2 &&
jl_tparam(mn->sig,1)==(jl_value_t*)jl_typeof(a1))
return mn->func;
mn = mn->next;
if (mn!=(void*)jl_nothing && jl_datatype_nfields(mn->sig)==2 &&
jl_tparam(mn->sig,1)==(jl_value_t*)jl_typeof(a1))
return mn->func;
}
}
}
}
}
if (ml == (void*)jl_nothing)
ml = mt->cache;
mt_assoc_lkup:
while (ml != (void*)jl_nothing) {
size_t lensig = jl_datatype_nfields(ml->sig);
if (lensig == n || (ml->va && lensig <= n+1)) {
if (cache_match(args, n, 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_svec_t *sp)
{
JL_GC_PUSH1(&sp);
if (jl_svec_len(l->sparams) > 0)
sp = jl_svec_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_function_t *jl_instantiate_method(jl_function_t *f, jl_svec_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);
gc_wb(nf, nf->linfo);
JL_GC_POP();
return nf;
}
// append values of static parameters to closure environment
static jl_function_t *with_appended_env(jl_function_t *meth, jl_svec_t *sparams)
{
if (sparams == jl_emptysvec)
return meth;
jl_value_t *temp = (jl_value_t*)jl_alloc_svec(jl_svec_len(sparams)/2);
JL_GC_PUSH1(&temp);
size_t i;
for(i=0; i < jl_svec_len(temp); i++) {
jl_svecset(temp, i, jl_svecref(sparams,i*2+1));
}
temp = (jl_value_t*)jl_svec_append((jl_svec_t*)meth->env, (jl_svec_t*)temp);
meth = jl_new_closure(meth->fptr, temp, meth->linfo);
JL_GC_POP();
return meth;
}
// 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_tupletype_t *type,
jl_function_t *method, jl_svec_t *tvars,
int check_amb, int8_t isstaged, jl_value_t *parent);
jl_function_t *jl_method_cache_insert(jl_methtable_t *mt, jl_tupletype_t *type,
jl_function_t *method)
{
jl_methlist_t **pml = &mt->cache;
jl_value_t* cache_array = NULL;
if (jl_datatype_nfields(type) > 0) {
jl_value_t *t0 = jl_tparam0(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 == (void*)jl_nothing) {
mt->cache_targ = jl_alloc_cell_1d(16);
gc_wb(mt, mt->cache_targ);
}
pml = mtcache_hash_bp(&mt->cache_targ, a0, 1, (jl_value_t*)mt);
cache_array = (jl_value_t*)mt->cache_targ;
goto ml_do_insert;
}
}
if (jl_is_datatype(t0))
uid = ((jl_datatype_t*)t0)->uid;
if (uid > 0) {
if (mt->cache_arg1 == (void*)jl_nothing) {
mt->cache_arg1 = jl_alloc_cell_1d(16);
gc_wb(mt, mt->cache_arg1);
}
pml = mtcache_hash_bp(&mt->cache_arg1, t0, 0, (jl_value_t*)mt);
cache_array = (jl_value_t*)mt->cache_arg1;
}
}
ml_do_insert:
return jl_method_list_insert(pml, type, method, jl_emptysvec, 0, 0, cache_array ? cache_array : (jl_value_t*)mt)->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_tupletype_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_emptysvec;
fargs[3] = (jl_value_t*)def;
#ifdef TRACE_INFERENCE
jl_printf(JL_STDERR,"inference on %s", li->name->name);
jl_static_show_func_sig(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_fieldref(newast, 0);
gc_wb(li, li->ast);
li->inferred = 1;
#endif
li->inInference = 0;
}
jl_in_inference = last_ii;
}
jl_value_t *jl_nth_slot_type(jl_tupletype_t *sig, size_t i)
{
size_t len = jl_datatype_nfields(sig);
if (len == 0)
return NULL;
if (i < len-1)
return jl_tparam(sig, i);
if (jl_is_vararg_type(jl_tparam(sig,len-1)))
return jl_tparam0(jl_tparam(sig,len-1));
if (i == len-1)
return jl_tparam(sig, i);
return NULL;
}
static int very_general_type(jl_value_t *t)
{
return (t && (t==(jl_value_t*)jl_any_type || t == (jl_value_t*)jl_type_type ||
(jl_is_typevar(t) &&
((jl_tvar_t*)t)->ub==(jl_value_t*)jl_any_type)));
}
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_tupletype_t *type,
jl_function_t *method, jl_tupletype_t *decl,
jl_svec_t *sparams, int8_t isstaged)
{
size_t i;
int need_guard_entries = 0;
jl_value_t *temp=NULL;
jl_value_t *temp2=NULL;
jl_function_t *newmeth=NULL;
jl_svec_t *newparams=NULL;
jl_svec_t *limited=NULL;
jl_tupletype_t *origtype = type; // TODO: root?
JL_GC_PUSH5(&temp, &temp2, &newmeth, &newparams, &limited);
size_t np = jl_nparams(type);
newparams = jl_svec_copy(type->parameters);
for (i=0; i < np; i++) {
jl_value_t *elt = jl_tparam(type,i);
jl_value_t *decl_i = jl_nth_slot_type(decl,i);
if (jl_is_type_type(elt) && jl_is_tuple_type(jl_tparam0(elt)) &&
!(jl_subtype(decl_i, (jl_value_t*)jl_type_type, 0) && !is_kind(decl_i))) {
jl_methlist_t *curr = mt->defs;
int ok=1;
while (curr != (void*)jl_nothing) {
jl_value_t *slottype = jl_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_typeof(jl_tparam0(elt));
jl_svecset(newparams, i, elt);
}
}
int set_to_any = 0;
if (decl_i == jl_ANY_flag) {
// don't specialize on slots marked ANY
jl_svecset(newparams, i, (jl_value_t*)jl_any_type);
temp2 = (jl_value_t*)jl_svec_copy(newparams);
temp2 = (jl_value_t*)jl_apply_tuple_type((jl_svec_t*)temp2);
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 != (void*)jl_nothing && curr->func!=method) {
if (jl_type_intersection((jl_value_t*)curr->sig,
(jl_value_t*)temp2) !=
(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_svecset(newparams, i, jl_tparam(type, i));
}
else {
set_to_any = 1;
}
}
if (set_to_any) {
}
else if (jl_is_type_type(elt) && jl_is_type_type(jl_tparam0(elt)) &&
// give up on specializing static parameters for Type{Type{Type{...}}}
(jl_is_type_type(jl_tparam0(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_nparams(decl)) {
jl_value_t *declt = jl_tparam(decl,i);
// for T..., intersect with T
if (jl_is_vararg_type(declt))
declt = jl_tparam0(declt);
jl_value_t *di = jl_type_intersection(declt, (jl_value_t*)jl_typetype_type);
if (is_kind(di))
// issue #11355: DataType has a UID and so takes precedence in the cache
jl_svecset(newparams, i, (jl_value_t*)jl_typetype_type);
else
jl_svecset(newparams, i, di);
// TODO: recompute static parameter values, so in extreme cases we
// can give `T=Type` instead of `T=Type{Type{Type{...`.
}
else {
jl_svecset(newparams, i, (jl_value_t*)jl_typetype_type);
}
need_guard_entries = 1;
assert(jl_svecref(newparams,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_typeof(jl_tparam0(elt));
while (curr != (void*)jl_nothing) {
jl_value_t *slottype = jl_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_svecset(newparams, i, kind);
}
else {
curr = mt->defs;
while (curr != (void*)jl_nothing) {
jl_value_t *slottype = jl_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_svecset(newparams, i, jl_typetype_type);
need_guard_entries = 1;
}
}
}
}
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 != (void*)jl_nothing) {
jl_value_t *slottype = jl_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_svecset(newparams, 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 (!isstaged && jl_nparams(type) > mt->max_args && jl_is_va_tuple(decl)) {
size_t nspec = mt->max_args + 2;
limited = jl_alloc_svec(nspec);
for(i=0; i < nspec-1; i++) {
jl_svecset(limited, i, jl_svecref(newparams, i));
}
jl_value_t *lasttype = jl_svecref(newparams,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_svec_len(newparams); j++) {
if (!jl_subtype(jl_svecref(newparams,j), lasttype, 0)) {
all_are_subtypes = 0;
break;
}
}
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;
jl_svecset(limited, i, jl_wrap_vararg(lasttype));
}
else {
jl_value_t *lastdeclt = jl_tparam(decl,jl_nparams(decl)-1);
if (jl_svec_len(sparams) > 0) {
lastdeclt = (jl_value_t*)
jl_instantiate_type_with((jl_value_t*)lastdeclt,
sparams->data,
jl_svec_len(sparams)/2);
}
jl_svecset(limited, i, lastdeclt);
}
type = jl_apply_tuple_type(limited);
temp2 = (jl_value_t*)type;
// 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;
}
else {
type = jl_apply_tuple_type(newparams);
temp2 = (jl_value_t*)type;
}
if (need_guard_entries) {
temp = ml_matches(mt->defs, (jl_value_t*)type, lambda_sym, -1);
int unmatched_tvars = 0;
for(i=0; i < jl_array_len(temp); i++) {
jl_value_t *m = jl_cellref(temp, i);
jl_value_t *env = jl_svecref(m,1);
for(int k=1; k < jl_svec_len(env); k+=2) {
if (jl_is_typevar(jl_svecref(env,k))) {
unmatched_tvars = 1; break;
}
}
if (unmatched_tvars) {
// if distinguishing a guard entry from the generalized signature
// would require matching type vars then bail out, since the
// method cache matching algorithm cannot do that.
type = origtype; break;
}
}
if (!unmatched_tvars) {
for(i=0; i < jl_array_len(temp); i++) {
jl_value_t *m = jl_cellref(temp, i);
if (((jl_methlist_t*)jl_svecref(m,2))->func != method) {
jl_method_cache_insert(mt, (jl_tupletype_t*)jl_svecref(m, 0), jl_bottom_func);
}
}
}
}
// here we infer types and specialize the method
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 {
if (jl_options.compile_enabled == JL_OPTIONS_COMPILE_OFF) {
if (method->linfo->unspecialized == NULL) {
jl_printf(JL_STDERR,"code missing for %s", method->linfo->name->name);
jl_static_show_func_sig(JL_STDERR, (jl_value_t*)type);
jl_printf(JL_STDERR, " sysimg may not have been built with --compile=all\n");
exit(1);
}
jl_function_t *unspec = method->linfo->unspecialized;
if (method->env == (jl_value_t*)jl_emptysvec)
newmeth = unspec;
else
newmeth = jl_new_closure(unspec->fptr, method->env, unspec->linfo);
if (sparams != jl_emptysvec)
newmeth = with_appended_env(newmeth, sparams);
(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.
NOTE: this is now needed when we start with a system image compiled
with --compile=all.
*/
/*
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_emptysvec) {
// 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_emptysvec);
if (method->env != (jl_value_t*)jl_emptysvec)
method->linfo->unspecialized->env = NULL;
gc_wb(method->linfo, method->linfo->unspecialized);
}
newmeth->linfo->unspecialized = method->linfo->unspecialized;
gc_wb(newmeth->linfo, newmeth->linfo->unspecialized);
}
if (newmeth->linfo != NULL && newmeth->linfo->ast != NULL) {
newmeth->linfo->specTypes = type;
gc_wb(newmeth->linfo, 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;
gc_wb(method->linfo, method->linfo->specializations);
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_svec_t **penv,
jl_svec_t *tvars)
{
jl_value_t *ti = jl_type_intersection_matching(a, b, penv, tvars);
if (ti == (jl_value_t*)jl_bottom_type)
return ti;
JL_GC_PUSH1(&ti);
assert(jl_is_svec(*penv));
jl_value_t **ee = (jl_value_t**)alloca(sizeof(void*) * jl_svec_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_svec_data(tvars);
tvarslen = jl_svec_len(tvars);
}
int l = jl_svec_len(*penv);
for(int i=0; i < l; i+=2) {
jl_value_t *v = jl_svecref(*penv,i);
jl_value_t *val = jl_svecref(*penv,i+1);
for(int j=0; j < tvarslen; j++) {
if (v == tvs[j]) {
ee[n++] = v;
ee[n++] = val;
/*
since "a" is a concrete type, we assume that
(a∩b != Union()) => a<:b. However if a static parameter is
forced to equal Union(), then part of "b" might become Union(),
and therefore a subtype of "a". For example
(Type{Union()},Int) ∩ (Type{T},T)
issue #5254
*/
if (val == (jl_value_t*)jl_bottom_type) {
if (!jl_subtype(a, ti, 0)) {
JL_GC_POP();
return (jl_value_t*)jl_bottom_type;
}
}
}
}
}
if (n != l) {
jl_svec_t *en = jl_alloc_svec_uninit(n);
memcpy(en->data, ee, n*sizeof(void*));
*penv = en;
}
JL_GC_POP();
return ti;
}
DLLEXPORT jl_function_t *jl_instantiate_staged(jl_methlist_t *m, jl_tupletype_t *tt, jl_svec_t *env)
{
jl_expr_t *ex = NULL;
jl_expr_t *oldast = NULL;
jl_function_t *func = NULL;
JL_GC_PUSH3(&ex, &oldast, &func);
if (jl_is_expr(m->func->linfo->ast))
oldast = (jl_expr_t*)m->func->linfo->ast;
else
oldast = (jl_expr_t*)jl_uncompress_ast(m->func->linfo, m->func->linfo->ast);
assert(oldast->head == lambda_sym);
ex = jl_exprn(arrow_sym, 2);
jl_array_t *oldargnames = (jl_array_t*)jl_cellref(oldast->args,0);
jl_expr_t *argnames = jl_exprn(tuple_sym, jl_array_len(oldargnames));
jl_cellset(ex->args, 0, argnames);
for (size_t i = 0; i < jl_array_len(oldargnames); ++i) {
jl_value_t *arg = jl_cellref(oldargnames,i);
if (jl_is_expr(arg)) {
assert(((jl_expr_t*)arg)->head == colons_sym);
arg = jl_cellref(((jl_expr_t*)arg)->args,0);
assert(jl_is_symbol(arg));
jl_expr_t *dd_expr = jl_exprn(dots_sym,1);
jl_cellset(dd_expr->args,0,arg);
jl_cellset(argnames->args,i,dd_expr);
}
else {
assert(jl_is_symbol(arg));
jl_cellset(argnames->args,i,arg);
}
}
func = with_appended_env(m->func, env);
jl_cellset(ex->args, 1, jl_apply(func, jl_svec_data(tt->parameters), jl_nparams(tt)));
func = (jl_function_t*)jl_toplevel_eval_in(m->func->linfo->module, (jl_value_t*)ex);
JL_GC_POP();
return func;
}
static jl_function_t *jl_mt_assoc_by_type(jl_methtable_t *mt, jl_datatype_t *tt, int cache, int inexact)
{
jl_methlist_t *m = mt->defs;
size_t nargs = jl_nparams(tt);
size_t i;
jl_value_t *ti=(jl_value_t*)jl_bottom_type;
jl_tupletype_t *newsig=NULL;
jl_svec_t *env = jl_emptysvec;
jl_function_t *func = NULL;
JL_GC_PUSH3(&env, &newsig, &func);
while (m != (void*)jl_nothing) {
if (m->tvars!=jl_emptysvec) {
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_svec_len(env); i+=2) {
if (jl_is_typevar(jl_svecref(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
JL_GC_POP();
return jl_bottom_func;
}
break;
}
}
if (i >= jl_svec_len(env))
break;
ti = (jl_value_t*)jl_bottom_type;
}
}
else if (jl_tuple_subtype(jl_svec_data(tt->parameters), nargs, m->sig, 0)) {
break;
}
m = m->next;
}
if (ti == (jl_value_t*)jl_bottom_type) {
if (m != (void*)jl_nothing) {
func = m->func;
if (m->isstaged)
func = jl_instantiate_staged(m,tt,env);
if (!cache) {
JL_GC_POP();
return func;
}
jl_function_t *res = cache_method(mt, tt, func, m->sig, jl_emptysvec, m->isstaged);
JL_GC_POP();
return res;
}
JL_GC_POP();
return jl_bottom_func;
}
assert(jl_is_svec(env));
func = m->func;
if (m->isstaged)
func = jl_instantiate_staged(m,tt,env);
// don't bother computing this if no arguments are tuples
for(i=0; i < jl_nparams(tt); i++) {
if (jl_is_tuple_type(jl_tparam(tt,i)))
break;
}
if (i < jl_nparams(tt)) {
newsig = (jl_tupletype_t*)jl_instantiate_type_with((jl_value_t*)m->sig,
jl_svec_data(env),
jl_svec_len(env)/2);
}
else {
newsig = m->sig;
}
assert(jl_is_tuple_type(newsig));