forked from JuliaLang/julia
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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 <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <assert.h>
#include <sys/types.h>
#include <limits.h>
#include <errno.h>
#include <math.h>
#include "julia.h"
static jl_methtable_t *new_method_table(void)
{
jl_methtable_t *mt = (jl_methtable_t*)allocobj(sizeof(jl_methtable_t));
mt->type = (jl_type_t*)jl_methtable_type;
mt->defs = NULL;
mt->cache = NULL;
mt->cache_1arg = NULL;
mt->sealed = 0;
mt->max_args = 0;
#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 > sig->length)
return 0;
if (sig->length > n) {
if (!(n == sig->length-1 && va))
return 0;
}
size_t i;
for(i=0; i < n; i++) {
jl_value_t *decl = jl_tupleref(sig, i);
if (i == sig->length-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_tag_type(a) && jl_is_tag_type(decl) &&
((jl_tag_type_t*)decl)->name == jl_type_type->name &&
((jl_tag_type_t*)a )->name == jl_type_type->name) {
if (jl_tparam0(decl) == (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), jl_tparam0(decl))) {
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)
{
if (sig->length > n) {
if (n != sig->length-1)
return 0;
}
size_t i;
for(i=0; i < n; i++) {
jl_value_t *decl = jl_tupleref(sig, i);
if (i == sig->length-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 (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, 1))
return 0;
}
else if (jl_is_type_type(decl) &&
jl_is_nontuple_type(a)) { //***
if (jl_tparam0(decl) == (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!=jl_tparam0(decl) && !jl_types_equal(a,jl_tparam0(decl)))
return 0;
}
}
else if (decl == (jl_value_t*)jl_any_type) {
}
else {
/*
we know there are only concrete types here, and types are
hash-consed, so pointer comparison should work.
*/
if ((jl_value_t*)jl_typeof(a) != decl)
return 0;
}
}
return 1;
}
#define FASTER_1ARG 1
static jl_function_t *jl_method_table_assoc_exact_by_type(jl_methtable_t *mt,
jl_tuple_t *types)
{
if (FASTER_1ARG && types->length == 1) {
jl_value_t *ty = jl_t0(types);
if (jl_is_struct_type(ty) || jl_is_bits_type(ty)) {
uptrint_t uid = ((jl_struct_type_t*)ty)->uid;
assert(uid > 0);
if (mt->cache_1arg && uid < jl_array_len(mt->cache_1arg)) {
jl_function_t *m = (jl_function_t*)jl_cellref(mt->cache_1arg, uid);
if (m)
return m;
}
}
}
jl_methlist_t *ml = mt->cache;
while (ml != NULL) {
if (cache_match_by_type(&jl_tupleref(types,0), types->length,
(jl_tuple_t*)ml->sig, ml->va)) {
return ml->func;
}
ml = ml->next;
}
return NULL;
}
// trivial linked list implementation for now
// TODO: pull out all the stops
static jl_function_t *jl_method_table_assoc_exact(jl_methtable_t *mt,
jl_value_t **args, size_t n)
{
if (FASTER_1ARG && n == 1) {
jl_value_t *ty = (jl_value_t*)jl_typeof(args[0]);
if (jl_is_struct_type(ty) || jl_is_bits_type(ty)) {
uptrint_t uid = ((jl_struct_type_t*)ty)->uid;
if (uid > 0 && mt->cache_1arg &&
uid < jl_array_len(mt->cache_1arg)) {
jl_function_t *m = (jl_function_t*)jl_cellref(mt->cache_1arg, uid);
if (m)
return m;
}
}
}
jl_methlist_t *ml = mt->cache;
while (ml != NULL) {
if (((jl_tuple_t*)ml->sig)->length == n || ml->va) {
if (cache_match(args, n, (jl_tuple_t*)ml->sig, ml->va)) {
return ml->func;
}
}
ml = ml->next;
}
return NULL;
}
// 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_PUSH(&sp);
if (l->sparams->length > 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;
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);
JL_GC_PUSH(&nf);
if (f->env != NULL && jl_is_tuple(f->env) &&
((jl_tuple_t*)f->env)->length == 2 &&
jl_t0(f->env) == (jl_value_t*)f) {
nf->env = (jl_value_t*)jl_tuple2((jl_value_t*)nf, jl_t1(f->env));
}
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)
{
jl_function_t *nf = jl_new_closure(NULL, NULL);
nf->linfo = li;
JL_GC_PUSH(&nf);
jl_value_t *env;
if (f->fptr == &jl_trampoline) {
env = jl_t1(f->env);
}
else {
env = f->env;
}
if (li->fptr != NULL) {
nf->fptr = li->fptr;
nf->env = env;
}
else {
nf->fptr = &jl_trampoline;
nf->env = (jl_value_t*)jl_tuple2((jl_value_t*)nf, env);
}
JL_GC_POP();
return nf;
}
jl_methlist_t *jl_method_table_insert(jl_methtable_t *mt, jl_tuple_t *type,
jl_function_t *method);
static
jl_methlist_t *jl_method_list_insert(jl_methlist_t **pml, jl_tuple_t *type,
jl_function_t *method, int check_amb);
static
jl_function_t *jl_method_cache_insert(jl_methtable_t *mt, jl_tuple_t *type,
jl_function_t *method)
{
if (FASTER_1ARG && type->length == 1) {
jl_value_t *t0 = jl_t0(type);
uptrint_t uid=0;
if (jl_is_struct_type(t0))
uid = ((jl_struct_type_t*)t0)->uid;
else if (jl_is_bits_type(t0))
uid = ((jl_bits_type_t*)t0)->uid;
if (uid > 0) {
if (mt->cache_1arg == NULL)
mt->cache_1arg = jl_alloc_cell_1d(0);
if (uid >= jl_array_len(mt->cache_1arg)) {
jl_array_grow_end(mt->cache_1arg, uid+10-jl_array_len(mt->cache_1arg));
}
jl_cellset(mt->cache_1arg, uid, method);
return method;
}
}
return jl_method_list_insert(&mt->cache, type, method, 0)->func;
}
extern jl_function_t *jl_typeinf_func;
#define ENABLE_INFERENCE
//#define TRACE_INFERENCE
#ifdef TRACE_INFERENCE
static char *type_summary(jl_value_t *t);
static void print_sig(jl_tuple_t *type)
{
size_t i;
for(i=0; i < type->length; i++) {
if (i > 0) ios_printf(ios_stderr, ", ");
jl_value_t *v = jl_tupleref(type,i);
if (jl_is_tuple(v)) {
ios_putc('(', ios_stderr);
print_sig((jl_tuple_t*)v);
ios_putc(')', ios_stderr);
}
else {
ios_printf(ios_stderr, "%s", type_summary(v));
}
}
}
#endif
static jl_value_t *nth_slot_type(jl_tuple_t *sig, size_t i)
{
size_t len = sig->length;
if (len == 0)
return NULL;
if (i < len-1)
return jl_tupleref(sig, i);
if (jl_is_seq_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 jl_value_t *ml_matches(jl_methlist_t *ml, jl_value_t *type,
jl_sym_t *name, int lim);
/*
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
ios_printf(ios_stderr,"inference on %s(", li->name->name);
print_sig(argtypes);
ios_printf(ios_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 = jl_true;
#endif
li->inInference = 0;
}
jl_in_inference = last_ii;
}
static int tuple_all_Any(jl_tuple_t *t)
{
int i;
for(i=0; i < t->length; i++) {
if (jl_tupleref(t,i) != (jl_value_t*)jl_any_type)
return 0;
}
return 1;
}
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_dummy_entries = 0;
jl_value_t *temp=NULL;
jl_function_t *newmeth=NULL;
JL_GC_PUSH(&type, &temp, &newmeth);
for (i=0; i < type->length; i++) {
jl_value_t *elt = jl_tupleref(type,i);
int set_to_any = 0;
if (nth_slot_type(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 != 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_dummy=0;
temp = jl_tupleref(type, i);
if (i < decl->length) {
jl_value_t *declt = jl_tupleref(decl,i);
// for T..., intersect with T
if (jl_is_seq_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_dummy = 1;
}
else {
declt = jl_type_intersection(declt,
(jl_value_t*)jl_tuple_type);
if (((jl_tuple_t*)elt)->length > 3 ||
tuple_all_Any((jl_tuple_t*)declt)) {
jl_tupleset(type, i, declt);
might_need_dummy = 1;
}
}
}
else {
jl_tupleset(type, i, (jl_value_t*)jl_tuple_type);
might_need_dummy = 1;
}
assert(jl_tupleref(type,i) != (jl_value_t*)jl_bottom_type);
if (might_need_dummy) {
jl_methlist_t *curr = mt->defs;
// can't generalize type if there's an overlapping definition
// with typevars
while (curr != NULL && curr->func!=method) {
if (curr->has_tvars &&
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_dummy = 0;
break;
}
curr = curr->next;
}
}
if (might_need_dummy) {
jl_methlist_t *curr = mt->defs;
while (curr != NULL && curr->func!=method) {
jl_tuple_t *sig = curr->sig;
if (sig->length > i &&
jl_is_tuple(jl_tupleref(sig,i))) {
need_dummy_entries = 1;
break;
}
curr = curr->next;
}
}
}
else if (jl_is_type_type(elt) && jl_is_type_type(jl_tparam0(elt))) {
/*
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 < decl->length) {
jl_value_t *declt = jl_tupleref(decl,i);
// for T..., intersect with T
if (jl_is_seq_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(nth_slot_type(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.
*/
int ok=1;
jl_methlist_t *curr = mt->defs;
while (curr != NULL) {
jl_value_t *slottype = nth_slot_type(curr->sig, i);
if (slottype &&
!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_value_t*)jl_typetype_type);
}
}
}
// 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 (type->length > mt->max_args &&
jl_is_seq_type(jl_tupleref(decl,decl->length-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 < type->length; 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))
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_seq_type,
(jl_tuple_t*)temp));
}
else {
jl_tupleset(type, i, jl_tupleref(decl,decl->length-1));
}
// 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 dummy cache entries for all intersections
// of this signature and definitions. those dummy entries will
// supersede this one in conflicted cases, alerting us that there
// should actually be a cache miss.
need_dummy_entries = 1;
}
if (need_dummy_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),
NULL);
}
}
}
// 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->length; k++) {
li = (jl_lambda_info_t*)jl_cellref(lilist, k);
if (jl_types_equal(li->specTypes, (jl_value_t*)type))
break;
}
if (k == lilist->length) 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;
newmeth->env =
(jl_value_t*)jl_tuple2((jl_value_t*)newmeth, newmeth->env);
}
*/
(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 = (jl_value_t*)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_function_t *jl_mt_assoc_by_type(jl_methtable_t *mt, jl_tuple_t *tt, int cache)
{
jl_methlist_t *m = mt->defs;
size_t nargs = tt->length;
size_t i;
jl_value_t *env = (jl_value_t*)jl_false;
while (m != NULL) {
if (m->has_tvars) {
env = jl_type_match((jl_value_t*)tt, (jl_value_t*)m->sig);
if (env != (jl_value_t*)jl_false) break;
}
else if (jl_tuple_subtype(&jl_tupleref(tt,0), nargs,
&jl_tupleref(m->sig,0),
((jl_tuple_t*)m->sig)->length, 0, 0)) {
break;
}
m = m->next;
}
if (env == (jl_value_t*)jl_false) {
if (m != NULL) {
if (!cache) {
return m->func;
}
return cache_method(mt, tt, m->func, (jl_tuple_t*)m->sig, jl_null);
}
return NULL;
}
jl_tuple_t *tpenv=NULL;
jl_tuple_t *newsig=NULL;
JL_GC_PUSH(&env, &tpenv, &newsig);
assert(jl_is_tuple(env));
tpenv = jl_flatten_pairs((jl_tuple_t*)env);
// don't bother computing this if no arguments are tuples
for(i=0; i < tt->length; i++) {
if (jl_is_tuple(jl_tupleref(tt,i)))
break;
}
if (i < tt->length) {
newsig = (jl_tuple_t*)jl_instantiate_type_with((jl_type_t*)m->sig,
&jl_tupleref(tpenv,0),
tpenv->length/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, tpenv);
JL_GC_POP();
return nf;
}
jl_tag_type_t *jl_wrap_Type(jl_value_t *t);
static int sigs_eq(jl_value_t *a, jl_value_t *b)
{
if (jl_has_typevars(a) || jl_has_typevars(b)) {
return jl_types_equal_generic(a,b);
}
return jl_types_equal(a, b);
}
static int 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) {
return 0;
}
if (jl_has_typevars(a)) {
if (jl_type_match_morespecific(b,a) == (jl_value_t*)jl_false) {
return 1;
}
}
int nmsp = jl_type_morespecific(b,a,0);
if (nmsp == msp)
return 0;
}
if (jl_has_typevars((jl_value_t*)a)) {
int nmsp = jl_type_morespecific(b,a,0);
if (nmsp && msp)
return 1;
if (jl_type_match_morespecific(b,a) != (jl_value_t*)jl_false) {
return 0;
}
}
return msp;
}
static int is_va_tuple(jl_tuple_t *t)
{
return (t->length>0 && jl_is_seq_type(jl_tupleref(t,t->length-1)));
}
/*
warn about ambiguous method priorities
the relative priority of A and B is ambiguous if
!subtype(A,B) && !subtype(B,A) && no corresponding tuple
elements are disjoint.
for example, (AbstractArray, AbstractMatrix) and (AbstractMatrix, AbstractArray) are ambiguous.
however, (AbstractArray, AbstractMatrix, Foo) and (AbstractMatrix, AbstractArray, Bar) are fine
since Foo and Bar are disjoint, so there would be no confusion over
which one to call.
There is also this kind of ambiguity: foo{T,S}(T, S) vs. foo(Any,Any)
In this case jl_types_equal() is true, but one is jl_type_morespecific
or jl_type_match_morespecific than the other.
To check this, jl_types_equal_generic needs to be more sophisticated
so (T,T) is not equivalent to (Any,Any). (TODO)
*/
static void check_ambiguous(jl_methlist_t *ml, jl_tuple_t *type,
jl_tuple_t *sig, jl_sym_t *fname)
{
// we know !args_morespecific(type, sig)
if ((type->length==sig->length ||
(type->length==sig->length+1 && is_va_tuple(type)) ||
(type->length+1==sig->length && is_va_tuple(sig))) &&
!args_morespecific((jl_value_t*)sig, (jl_value_t*)type)) {
jl_value_t *isect = jl_type_intersection((jl_value_t*)type,
(jl_value_t*)sig);
if (isect == (jl_value_t*)jl_bottom_type)
return;
JL_GC_PUSH(&isect);
jl_methlist_t *l = ml;
while (l != NULL) {
if (sigs_eq(isect, (jl_value_t*)l->sig))
goto done_chk_amb; // ok, intersection is covered
l = l->next;
}
char *n = fname->name;
jl_value_t *errstream = jl_get_global(jl_system_module,
jl_symbol("stderr_stream"));
JL_TRY {
if (errstream)
jl_set_current_output_stream_obj(errstream);
ios_t *s = jl_current_output_stream();
ios_printf(s, "Warning: New definition %s", n);
jl_show((jl_value_t*)type);
ios_printf(s, " is ambiguous with %s", n);
jl_show((jl_value_t*)sig);
ios_printf(s, ".\n Make sure %s", n);
jl_show(isect);
ios_printf(s, " is defined first.\n");
}
JL_CATCH {
jl_raise(jl_exception_in_transit);
}
done_chk_amb:
JL_GC_POP();
}
}
static jl_tuple_t *find_tvars(jl_value_t *v, jl_tuple_t *env)
{
if (jl_is_typevar(v) && ((jl_tvar_t*)v)->bound) {
jl_tuple_t *pe = env;
while (pe != jl_null) {
if (jl_t0(pe) == v)
return env;
pe = (jl_tuple_t*)jl_t1(pe);
}
return jl_tuple2(v, env);
}
JL_GC_PUSH(&env);
if (jl_is_func_type(v)) {
env = find_tvars((jl_value_t*)((jl_func_type_t*)v)->from, env);
env = find_tvars((jl_value_t*)((jl_func_type_t*)v)->to , env);
goto done_find_tvars;
}
jl_tuple_t *params;
if (jl_is_tuple(v))
params = (jl_tuple_t*)v;
else if (jl_is_union_type(v))
params = ((jl_uniontype_t*)v)->types;
else if (jl_is_some_tag_type(v))
params = ((jl_tag_type_t*)v)->parameters;
else
goto done_find_tvars;
int i;
for(i=0; i < params->length; i++) {
jl_value_t *p = jl_tupleref(params, i);
if (p != v)
env = find_tvars(p, env);
}
done_find_tvars:
JL_GC_POP();
return env;
}
static int has_unions(jl_tuple_t *type)
{
int i;
for(i=0; i < type->length; i++) {
jl_value_t *t = jl_tupleref(type,i);
if (jl_is_union_type(t) ||
(jl_is_seq_type(t) && jl_is_union_type(jl_tparam0(t))))
return 1;
}
return 0;
}
static
jl_methlist_t *jl_method_list_insert(jl_methlist_t **pml, jl_tuple_t *type,
jl_function_t *method, int check_amb)
{
jl_methlist_t *l, **pl;
assert(jl_is_tuple(type));
l = *pml;
while (l != NULL) {
if (sigs_eq((jl_value_t*)type, (jl_value_t*)l->sig)) {
// method overwritten
JL_SIGATOMIC_BEGIN();
l->sig = type;
l->tvars = find_tvars((jl_value_t*)type, jl_null);
l->has_tvars = (l->tvars != jl_null);
l->va = (type->length > 0 &&
jl_is_seq_type(jl_tupleref(type,type->length-1)));
l->invokes = NULL;
l->func = method;
JL_SIGATOMIC_END();
return l;
}
l = l->next;
}
pl = pml;
l = *pml;
while (l != NULL) {
if (args_morespecific((jl_value_t*)type, (jl_value_t*)l->sig))
break;
if (check_amb) {
check_ambiguous(*pml, (jl_tuple_t*)type, (jl_tuple_t*)l->sig,
method->linfo ? method->linfo->name :
anonymous_sym);
}
pl = &l->next;
l = l->next;
}
jl_tuple_t *tv = find_tvars((jl_value_t*)type, jl_null);
JL_GC_PUSH(&tv);
jl_methlist_t *newrec = (jl_methlist_t*)allocb(sizeof(jl_methlist_t));
newrec->sig = type;
newrec->tvars = tv;
newrec->has_tvars = (newrec->tvars != jl_null);
newrec->va = (type->length > 0 &&
jl_is_seq_type(jl_tupleref(type,type->length-1)));
newrec->func = method;
newrec->invokes = NULL;
newrec->next = l;
JL_SIGATOMIC_BEGIN();
*pl = newrec;
// if this contains Union types, methods after it might actually be
// more specific than it. we need to re-sort them.
if (has_unions(type)) {
jl_methlist_t *item = newrec->next, *next;
jl_methlist_t **pitem = &newrec->next, **pnext;
while (item != NULL) {
pl = pml;
l = *pml;
next = item->next;
pnext = &item->next;
while (l != newrec->next) {
if (args_morespecific((jl_value_t*)item->sig,
(jl_value_t*)l->sig)) {
// reinsert item earlier in the list
*pitem = next;
item->next = l;
*pl = item;
pnext = pitem;
break;
}
pl = &l->next;
l = l->next;
}
item = next;
pitem = pnext;
}
}
JL_SIGATOMIC_END();
JL_GC_POP();
return newrec;
}
jl_methlist_t *jl_method_table_insert(jl_methtable_t *mt, jl_tuple_t *type,
jl_function_t *method)
{
JL_SIGATOMIC_BEGIN();
jl_methlist_t *ml = jl_method_list_insert(&mt->defs, type, method, 1);
// invalidate cached methods that overlap this definition
jl_methlist_t *l = mt->cache;
jl_methlist_t **pthis = &mt->cache;
while (l != NULL) {
if (jl_type_intersection((jl_value_t*)type, (jl_value_t*)l->sig) !=
(jl_value_t*)jl_bottom_type) {
*pthis = l->next;
}
else {
pthis = &l->next;
}
l = l->next;
}
if (type->length == 1) {
mt->cache_1arg = NULL;
}
// update max_args
jl_tuple_t *t = (jl_tuple_t*)type;
size_t na = t->length;
if (t->length>0 && jl_is_seq_type(jl_tupleref(t,t->length-1)))
na--;
if (na > mt->max_args) {
mt->max_args = na;
}
JL_SIGATOMIC_END();
return ml;
}
jl_value_t *jl_no_method_error(jl_function_t *f, jl_value_t **args, size_t na)