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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
. dispatch
. static parameter inference
. method specialization and caching, invoking type inference
*/
#include <stdlib.h>
#include <string.h>
#include "julia.h"
#include "julia_internal.h"
#ifndef _OS_WINDOWS_
#include <unistd.h>
#endif
#include "julia_assert.h"
// The compilation signature is not used to cache the method if the number of overlapping methods is greater than this
#define MAX_UNSPECIALIZED_CONFLICTS 32
#ifdef __cplusplus
extern "C" {
#endif
JL_DLLEXPORT size_t jl_world_counter = 1;
JL_DLLEXPORT size_t jl_get_world_counter(void)
{
return jl_world_counter;
}
JL_DLLEXPORT size_t jl_get_tls_world_age(void)
{
return jl_get_ptls_states()->world_age;
}
/// ----- Handling for Julia callbacks ----- ///
JL_DLLEXPORT int8_t jl_is_in_pure_context(void)
{
jl_ptls_t ptls = jl_get_ptls_states();
return ptls->in_pure_callback;
}
tracer_cb jl_newmeth_tracer = NULL;
JL_DLLEXPORT void jl_register_newmeth_tracer(void (*callback)(jl_method_t *tracee))
{
jl_newmeth_tracer = (tracer_cb)callback;
}
void jl_call_tracer(tracer_cb callback, jl_value_t *tracee)
{
jl_ptls_t ptls = jl_get_ptls_states();
int last_in = ptls->in_pure_callback;
JL_TRY {
ptls->in_pure_callback = 1;
callback(tracee);
ptls->in_pure_callback = last_in;
}
JL_CATCH {
ptls->in_pure_callback = last_in;
jl_printf(JL_STDERR, "WARNING: tracer callback function threw an error:\n");
jl_static_show(JL_STDERR, jl_current_exception());
jl_printf(JL_STDERR, "\n");
jlbacktrace();
}
}
/// ----- Definitions for various internal TypeMaps ----- ///
const struct jl_typemap_info method_defs = {
0, &jl_method_type
};
const struct jl_typemap_info lambda_cache = {
0, &jl_method_instance_type
};
const struct jl_typemap_info tfunc_cache = {
1, &jl_any_type
};
static int8_t jl_cachearg_offset(jl_methtable_t *mt)
{
return mt->offs;
}
/// ----- Insertion logic for special entries ----- ///
static uint_t speccache_hash(size_t idx, jl_svec_t *data)
{
jl_method_instance_t *ml = (jl_method_instance_t*)jl_svecref(data, idx);
jl_value_t *sig = ml->specTypes;
if (jl_is_unionall(sig))
sig = jl_unwrap_unionall(sig);
return ((jl_datatype_t*)sig)->hash;
}
static int speccache_eq(size_t idx, const void *ty, jl_svec_t *data, uint_t hv)
{
jl_method_instance_t *ml = (jl_method_instance_t*)jl_svecref(data, idx);
jl_value_t *sig = ml->specTypes;
if (ty == sig)
return 1;
uint_t h2 = ((jl_datatype_t*)(jl_is_unionall(sig) ? jl_unwrap_unionall(sig) : sig))->hash;
if (h2 != hv)
return 0;
return jl_types_equal(sig, (jl_value_t*)ty);
}
// get or create the MethodInstance for a specialization
JL_DLLEXPORT jl_method_instance_t *jl_specializations_get_linfo(jl_method_t *m JL_PROPAGATES_ROOT, jl_value_t *type, jl_svec_t *sparams)
{
uint_t hv = ((jl_datatype_t*)(jl_is_unionall(type) ? jl_unwrap_unionall(type) : type))->hash;
for (int locked = 0; ; locked++) {
jl_array_t *speckeyset = jl_atomic_load_acquire(&m->speckeyset);
jl_svec_t *specializations = jl_atomic_load_acquire(&m->specializations);
size_t i, cl = jl_svec_len(specializations);
if (hv) {
ssize_t idx = jl_smallintset_lookup(speckeyset, speccache_eq, type, specializations, hv);
if (idx != -1) {
jl_method_instance_t *mi = (jl_method_instance_t*)jl_svecref(specializations, idx);
JL_GC_PROMISE_ROOTED(mi); // clang-sa doesn't understand jl_atomic_load_relaxed
if (locked)
JL_UNLOCK(&m->writelock);
return mi;
}
}
else {
jl_method_instance_t **data = (jl_method_instance_t**)jl_svec_data(specializations);
JL_GC_PUSH1(&specializations); // clang-sa doesn't realize this loop uses specializations
for (i = cl; i > 0; i--) {
jl_method_instance_t *mi = jl_atomic_load_relaxed(&data[i - 1]);
JL_GC_PROMISE_ROOTED(mi); // clang-sa doesn't understand jl_atomic_load_relaxed
if (mi == NULL)
break;
if (jl_types_equal(mi->specTypes, type)) {
if (locked)
JL_UNLOCK(&m->writelock);
JL_GC_POP();
return mi;
}
}
JL_GC_POP();
}
if (!sparams) // can't insert without knowing this
return NULL;
if (!locked) {
JL_LOCK(&m->writelock);
}
else {
if (hv) {
jl_method_instance_t **data = (jl_method_instance_t**)jl_svec_data(specializations);
for (i = 0; i < cl; i++) {
jl_method_instance_t *mi = jl_atomic_load_relaxed(&data[i]);
JL_GC_PROMISE_ROOTED(mi); // clang-sa doesn't understand jl_atomic_load_relaxed
if (mi == NULL)
break;
assert(!jl_types_equal(mi->specTypes, type));
}
}
jl_method_instance_t *mi = jl_get_specialized(m, type, sparams);
JL_GC_PUSH1(&mi);
if (hv ? (i + 1 >= cl || jl_svecref(specializations, i + 1) != NULL) : (i <= 1 || jl_svecref(specializations, i - 2) != NULL)) {
size_t ncl = cl < 8 ? 8 : (cl*3)>>1;
jl_svec_t *nc = jl_alloc_svec_uninit(ncl);
if (i > 0)
memcpy((char*)jl_svec_data(nc), jl_svec_data(specializations), sizeof(void*) * i);
memset((char*)jl_svec_data(nc) + sizeof(void*) * i, 0, sizeof(void*) * (ncl - cl));
if (i < cl)
memcpy((char*)jl_svec_data(nc) + sizeof(void*) * (i + ncl - cl),
(char*)jl_svec_data(specializations) + sizeof(void*) * i,
sizeof(void*) * (cl - i));
jl_atomic_store_release(&m->specializations, nc);
JL_GC_PROMISE_ROOTED(nc); // clang-sa doesn't understand jl_atomic_store_release
jl_gc_wb(m, nc);
specializations = nc;
if (!hv)
i += ncl - cl;
}
if (!hv)
i -= 1;
assert(jl_svecref(specializations, i) == NULL);
jl_svecset(specializations, i, mi); // jl_atomic_store_release?
if (hv) {
// TODO: fuse lookup and insert steps?
jl_smallintset_insert(&m->speckeyset, (jl_value_t*)m, speccache_hash, i, specializations);
}
JL_UNLOCK(&m->writelock);
JL_GC_POP();
return mi;
}
}
}
JL_DLLEXPORT jl_value_t *jl_specializations_lookup(jl_method_t *m, jl_value_t *type)
{
jl_value_t *mi = (jl_value_t*)jl_specializations_get_linfo(m, type, NULL);
if (mi == NULL)
return jl_nothing;
return mi;
}
JL_DLLEXPORT jl_value_t *jl_methtable_lookup(jl_methtable_t *mt, jl_value_t *type, size_t world)
{
struct jl_typemap_assoc search = {type, world, NULL, 0, ~(size_t)0};
jl_typemap_entry_t *sf = jl_typemap_assoc_by_type(mt->defs, &search, /*offs*/0, /*subtype*/0);
if (!sf)
return jl_nothing;
return sf->func.value;
}
// ----- MethodInstance specialization instantiation ----- //
JL_DLLEXPORT jl_method_t *jl_new_method_uninit(jl_module_t*);
JL_DLLEXPORT jl_code_instance_t* jl_set_method_inferred(
jl_method_instance_t *mi, jl_value_t *rettype,
jl_value_t *inferred_const, jl_value_t *inferred,
int32_t const_flags, size_t min_world, size_t max_world);
jl_datatype_t *jl_mk_builtin_func(jl_datatype_t *dt, const char *name, jl_fptr_args_t fptr) JL_GC_DISABLED
{
jl_sym_t *sname = jl_symbol(name);
if (dt == NULL) {
jl_value_t *f = jl_new_generic_function_with_supertype(sname, jl_core_module, jl_builtin_type);
jl_set_const(jl_core_module, sname, f);
dt = (jl_datatype_t*)jl_typeof(f);
}
jl_method_t *m = jl_new_method_uninit(jl_core_module);
m->name = sname;
m->module = jl_core_module;
m->isva = 1;
m->nargs = 2;
m->sig = (jl_value_t*)jl_anytuple_type;
m->slot_syms = jl_an_empty_string;
JL_GC_PUSH1(&m);
jl_method_instance_t *mi = jl_get_specialized(m, (jl_value_t*)jl_anytuple_type, jl_emptysvec);
m->unspecialized = mi;
jl_gc_wb(m, mi);
jl_code_instance_t *codeinst = jl_set_method_inferred(mi, (jl_value_t*)jl_any_type, jl_nothing, jl_nothing,
0, 1, ~(size_t)0);
codeinst->specptr.fptr1 = fptr;
codeinst->invoke = jl_fptr_args;
jl_methtable_t *mt = dt->name->mt;
jl_typemap_insert(&mt->cache, (jl_value_t*)mt, jl_anytuple_type,
NULL, jl_emptysvec, (jl_value_t*)mi, 0, &lambda_cache, 1, ~(size_t)0);
mt->frozen = 1;
JL_GC_POP();
return dt;
}
// run type inference on lambda "mi" for given argument types.
// returns the inferred source, and may cache the result in mi
// if successful, also updates the mi argument to describe the validity of this src
// if inference doesn't occur (or can't finish), returns NULL instead
jl_code_info_t *jl_type_infer(jl_method_instance_t *mi, size_t world, int force)
{
JL_TIMING(INFERENCE);
if (jl_typeinf_func == NULL)
return NULL;
if (jl_is_method(mi->def.method) && mi->def.method->unspecialized == mi)
return NULL; // avoid inferring the unspecialized method
static int in_inference;
if (in_inference > 2)
return NULL;
jl_code_info_t *src = NULL;
#ifdef ENABLE_INFERENCE
if (mi->inInference && !force)
return NULL;
if (jl_is_method(mi->def.method) && mi->def.method->unspecialized == mi)
return NULL; // be careful never to infer the unspecialized method, this would not be valid
jl_value_t **fargs;
JL_GC_PUSHARGS(fargs, 3);
fargs[0] = (jl_value_t*)jl_typeinf_func;
fargs[1] = (jl_value_t*)mi;
fargs[2] = jl_box_ulong(world);
#ifdef TRACE_INFERENCE
if (mi->specTypes != (jl_value_t*)jl_emptytuple_type) {
jl_printf(JL_STDERR,"inference on ");
jl_static_show_func_sig(JL_STDERR, (jl_value_t*)mi->specTypes);
jl_printf(JL_STDERR, "\n");
}
#endif
jl_ptls_t ptls = jl_get_ptls_states();
int last_errno = errno;
#ifdef _OS_WINDOWS_
DWORD last_error = GetLastError();
#endif
size_t last_age = ptls->world_age;
ptls->world_age = jl_typeinf_world;
mi->inInference = 1;
in_inference++;
JL_TRY {
src = (jl_code_info_t*)jl_apply(fargs, 3);
}
JL_CATCH {
jl_printf(JL_STDERR, "Internal error: encountered unexpected error in runtime:\n");
jl_static_show(JL_STDERR, jl_current_exception());
jl_printf(JL_STDERR, "\n");
jlbacktrace(); // written to STDERR_FILENO
src = NULL;
}
ptls->world_age = last_age;
in_inference--;
mi->inInference = 0;
#ifdef _OS_WINDOWS_
SetLastError(last_error);
#endif
errno = last_errno;
if (src && !jl_is_code_info(src)) {
src = NULL;
}
JL_GC_POP();
#endif
return src;
}
JL_DLLEXPORT jl_value_t *jl_call_in_typeinf_world(jl_value_t **args, int nargs)
{
jl_ptls_t ptls = jl_get_ptls_states();
size_t last_age = ptls->world_age;
ptls->world_age = jl_typeinf_world;
jl_value_t *ret = jl_apply(args, nargs);
ptls->world_age = last_age;
return ret;
}
JL_DLLEXPORT jl_value_t *jl_rettype_inferred(jl_method_instance_t *mi, size_t min_world, size_t max_world) JL_NOTSAFEPOINT
{
jl_code_instance_t *codeinst = mi->cache;
while (codeinst) {
if (codeinst->min_world <= min_world && max_world <= codeinst->max_world) {
jl_value_t *code = codeinst->inferred;
if (code && (code == jl_nothing || jl_ir_flag_inferred((jl_array_t*)code)))
return (jl_value_t*)codeinst;
}
codeinst = codeinst->next;
}
return (jl_value_t*)jl_nothing;
}
JL_DLLEXPORT jl_code_instance_t *jl_get_method_inferred(
jl_method_instance_t *mi, jl_value_t *rettype,
size_t min_world, size_t max_world)
{
jl_code_instance_t *codeinst = mi->cache;
while (codeinst) {
if (codeinst->min_world == min_world &&
codeinst->max_world == max_world &&
jl_egal(codeinst->rettype, rettype)) {
return codeinst;
}
codeinst = codeinst->next;
}
return jl_set_method_inferred(
mi, rettype, NULL, NULL,
0, min_world, max_world);
}
JL_DLLEXPORT jl_code_instance_t *jl_set_method_inferred(
jl_method_instance_t *mi JL_PROPAGATES_ROOT, jl_value_t *rettype,
jl_value_t *inferred_const, jl_value_t *inferred,
int32_t const_flags, size_t min_world, size_t max_world
/*, jl_array_t *edges, int absolute_max*/)
{
jl_ptls_t ptls = jl_get_ptls_states();
assert(min_world <= max_world && "attempting to set invalid world constraints");
jl_code_instance_t *codeinst = (jl_code_instance_t*)jl_gc_alloc(ptls, sizeof(jl_code_instance_t),
jl_code_instance_type);
JL_GC_PUSH1(&codeinst);
codeinst->def = mi;
codeinst->min_world = min_world;
codeinst->max_world = max_world;
codeinst->rettype = rettype;
codeinst->inferred = inferred;
//codeinst->edges = NULL;
if ((const_flags & 2) == 0)
inferred_const = NULL;
codeinst->rettype_const = inferred_const;
codeinst->invoke = NULL;
if ((const_flags & 1) != 0) {
assert(const_flags & 2);
jl_atomic_store_release(&codeinst->invoke, jl_fptr_const_return);
}
codeinst->specptr.fptr = NULL;
codeinst->isspecsig = 0;
if (jl_is_method(mi->def.method))
JL_LOCK(&mi->def.method->writelock);
codeinst->next = mi->cache;
mi->cache = codeinst;
jl_gc_wb(mi, codeinst);
if (jl_is_method(mi->def.method))
JL_UNLOCK(&mi->def.method->writelock);
JL_GC_POP();
return codeinst;
}
static int get_method_unspec_list(jl_typemap_entry_t *def, void *closure)
{
jl_svec_t *specializations = def->func.method->specializations;
size_t i, l = jl_svec_len(specializations);
for (i = 0; i < l; i++) {
jl_method_instance_t *mi = (jl_method_instance_t*)jl_svecref(specializations, i);
if (mi) {
assert(jl_is_method_instance(mi));
if (jl_rettype_inferred(mi, jl_world_counter, jl_world_counter) == jl_nothing)
jl_array_ptr_1d_push((jl_array_t*)closure, (jl_value_t*)mi);
}
}
return 1;
}
static void foreach_mtable_in_module(
jl_module_t *m,
void (*visit)(jl_methtable_t *mt, void *env),
void *env,
jl_array_t *visited)
{
size_t i;
void **table = m->bindings.table;
jl_eqtable_put(visited, (jl_value_t*)m, jl_true, NULL);
for (i = 1; i < m->bindings.size; i += 2) {
if (table[i] != HT_NOTFOUND) {
jl_binding_t *b = (jl_binding_t*)table[i];
if (b->owner == m && b->value && b->constp) {
jl_value_t *v = jl_unwrap_unionall(b->value);
if (jl_is_datatype(v)) {
jl_typename_t *tn = ((jl_datatype_t*)v)->name;
if (tn->module == m && tn->name == b->name) {
jl_methtable_t *mt = tn->mt;
if (mt != NULL && (jl_value_t*)mt != jl_nothing && mt != jl_type_type_mt) {
visit(mt, env);
}
}
}
else if (jl_is_module(v)) {
jl_module_t *child = (jl_module_t*)v;
if (child != m && child->parent == m && child->name == b->name &&
!jl_eqtable_get(visited, v, NULL)) {
// this is the original/primary binding for the submodule
foreach_mtable_in_module(child, visit, env, visited);
}
}
}
}
}
}
void jl_foreach_reachable_mtable(void (*visit)(jl_methtable_t *mt, void *env), void *env)
{
jl_array_t *visited = jl_alloc_vec_any(16);
jl_array_t *mod_array = NULL;
JL_GC_PUSH2(&visited, &mod_array);
mod_array = jl_get_loaded_modules();
visit(jl_type_type_mt, env);
if (mod_array) {
int i;
for (i = 0; i < jl_array_len(mod_array); i++) {
jl_module_t *m = (jl_module_t*)jl_array_ptr_ref(mod_array, i);
assert(jl_is_module(m));
if (!jl_eqtable_get(visited, (jl_value_t*)m, NULL))
foreach_mtable_in_module(m, visit, env, visited);
}
}
else {
foreach_mtable_in_module(jl_main_module, visit, env, visited);
}
JL_GC_POP();
}
static void reset_mt_caches(jl_methtable_t *mt, void *env)
{
// removes all method caches
if (mt->defs != jl_nothing) // make sure not to reset builtin functions
mt->cache = jl_nothing;
jl_typemap_visitor(mt->defs, get_method_unspec_list, env);
}
jl_function_t *jl_typeinf_func = NULL;
size_t jl_typeinf_world = 0;
JL_DLLEXPORT void jl_set_typeinf_func(jl_value_t *f)
{
jl_typeinf_func = (jl_function_t*)f;
jl_typeinf_world = jl_get_tls_world_age();
++jl_world_counter; // make type-inference the only thing in this world
if (jl_typeinf_world == 0) {
// give type inference a chance to see all of these
// TODO: also reinfer if max_world != ~(size_t)0
jl_array_t *unspec = jl_alloc_vec_any(0);
JL_GC_PUSH1(&unspec);
jl_foreach_reachable_mtable(reset_mt_caches, (void*)unspec);
size_t i, l;
for (i = 0, l = jl_array_len(unspec); i < l; i++) {
jl_method_instance_t *mi = (jl_method_instance_t*)jl_array_ptr_ref(unspec, i);
if (jl_rettype_inferred(mi, jl_world_counter, jl_world_counter) == jl_nothing)
jl_type_infer(mi, jl_world_counter, 1);
}
JL_GC_POP();
}
}
static int very_general_type(jl_value_t *t)
{
return (t == (jl_value_t*)jl_any_type || jl_types_equal(t, (jl_value_t*)jl_type_type));
}
jl_value_t *jl_nth_slot_type(jl_value_t *sig, size_t i)
{
sig = jl_unwrap_unionall(sig);
size_t len = jl_nparams(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_unwrap_vararg(jl_tparam(sig, len-1));
if (i == len-1)
return jl_tparam(sig, i);
return NULL;
}
// if concrete_match returns false, the sig may specify `Type{T::DataType}`, while the `tt` contained DataType
// in this case, subtyping is wrong, and this may not actually match at runtime
// since it may instead match any kind of `Type{T::Type}`
//static int concrete_match(jl_tupletype_t *tt, jl_value_t *sig)
//{
// size_t i, np;
// for (i = 0, np = jl_nparams(tt); i < np; i++) {
// jl_value_t *elt = jl_tparam(tt, i);
// jl_value_t *decl_i = jl_nth_slot_type((jl_value_t*)sig, i);
// if (jl_is_kind(elt)) {
// // check whether this match may be exact at runtime
// if (!jl_subtype(elt, decl_i))
// return 0;
// }
// }
// return 1;
//}
static jl_value_t *ml_matches(jl_typemap_t *ml, int offs,
jl_tupletype_t *type, int lim, int include_ambiguous,
size_t world, size_t *min_valid, size_t *max_valid);
// get the compilation signature specialization for this method
static void jl_compilation_sig(
jl_tupletype_t *const tt, // the original tupletype of the call : this is expected to be a relative simple type (no Varags, Union, UnionAll, etc.)
jl_svec_t *sparams,
jl_method_t *definition,
intptr_t nspec,
// output:
jl_svec_t **const newparams JL_REQUIRE_ROOTED_SLOT)
{
if (definition->generator) {
// staged functions aren't optimized
// so assume the caller was intelligent about calling us
return;
}
jl_value_t *decl = definition->sig;
assert(jl_is_tuple_type(tt));
size_t i, np = jl_nparams(tt);
size_t nargs = definition->nargs; // == jl_nparams(jl_unwrap_unionall(decl));
for (i = 0; i < np; i++) {
jl_value_t *elt = jl_tparam(tt, i);
jl_value_t *decl_i = jl_nth_slot_type(decl, i);
size_t i_arg = (i < nargs - 1 ? i : nargs - 1);
if (jl_is_kind(decl_i)) {
// if we can prove the match was against the kind (not a Type)
// we want to put that in the cache instead
if (!*newparams) *newparams = jl_svec_copy(tt->parameters);
elt = decl_i;
jl_svecset(*newparams, i, elt);
}
else if (jl_is_type_type(elt)) {
// if the declared type was not Any or Union{Type, ...},
// then the match must been with the kind (e.g. UnionAll or DataType)
// and the result of matching the type signature
// needs to be restricted to the concrete type 'kind'
jl_value_t *kind = jl_typeof(jl_tparam0(elt));
if (jl_subtype(kind, decl_i) && !jl_subtype((jl_value_t*)jl_type_type, decl_i)) {
// if we can prove the match was against the kind (not a Type)
// it's simpler (and thus better) to put that cache instead
if (!*newparams) *newparams = jl_svec_copy(tt->parameters);
elt = kind;
jl_svecset(*newparams, i, elt);
}
}
else if (jl_is_kind(elt)) {
// not triggered for isdispatchtuple(tt), this attempts to handle
// some cases of adapting a random signature into a compilation signature
// if we get a kind, where we don't expect to accept one, widen it to something more expected (Type{T})
if (!(jl_subtype(elt, decl_i) && !jl_subtype((jl_value_t*)jl_type_type, decl_i))) {
if (!*newparams) *newparams = jl_svec_copy(tt->parameters);
elt = (jl_value_t*)jl_typetype_type;
jl_svecset(*newparams, i, elt);
}
}
if (jl_is_kind(elt)) {
// kind slots always need guard entries (checking for subtypes of Type)
continue;
}
if (i_arg > 0 && i_arg <= sizeof(definition->nospecialize) * 8 &&
(definition->nospecialize & (1 << (i_arg - 1)))) {
if (!jl_has_free_typevars(decl_i) && !jl_is_kind(decl_i)) {
if (decl_i != elt) {
if (!*newparams) *newparams = jl_svec_copy(tt->parameters);
jl_svecset(*newparams, i, (jl_value_t*)decl_i);
}
continue;
}
}
if (jl_types_equal(elt, (jl_value_t*)jl_typetype_type)) { // elt == Type{T} where T
// not triggered for isdispatchtuple(tt), this attempts to handle
// some cases of adapting a random signature into a compilation signature
}
else if (!jl_is_datatype(elt) && jl_subtype(elt, (jl_value_t*)jl_type_type)) { // elt <: Type{T}
// not triggered for isdispatchtuple(tt), this attempts to handle
// some cases of adapting a random signature into a compilation signature
if (!*newparams) *newparams = jl_svec_copy(tt->parameters);
jl_svecset(*newparams, i, jl_typetype_type);
}
else if (jl_is_type_type(elt)) { // elt isa Type{T}
if (very_general_type(decl_i)) {
/*
here's a fairly simple heuristic: if this argument slot's
declared type is general (Type or Any),
then don't specialize for every Type that got passed.
Since every type x has its own type Type{x}, this would be
excessive specialization for an Any slot.
This may require guard entries due to other potential matches.
In particular, 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.
*/
if (!*newparams) *newparams = jl_svec_copy(tt->parameters);
jl_svecset(*newparams, i, jl_typetype_type);
}
else if (jl_is_type_type(jl_tparam0(elt)) &&
// try to give up on specializing type parameters for Type{Type{Type{...}}}
(jl_is_type_type(jl_tparam0(jl_tparam0(elt))) || !jl_has_free_typevars(decl_i))) {
// TODO: this is probably solidly unsound and would corrupt the cache in many cases
/*
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 (!*newparams) *newparams = jl_svec_copy(tt->parameters);
if (i < nargs || !definition->isva) {
jl_value_t *di = jl_type_intersection(decl_i, (jl_value_t*)jl_typetype_type);
assert(di != (jl_value_t*)jl_bottom_type);
// issue #11355: DataType has a UID and so would take precedence in the cache
if (jl_is_kind(di))
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{...`. /* make editors happy:}}} */
}
else {
jl_svecset(*newparams, i, (jl_value_t*)jl_typetype_type);
}
}
}
int notcalled_func = (i_arg > 0 && i_arg <= 8 && !(definition->called & (1 << (i_arg - 1))) &&
jl_subtype(elt, (jl_value_t*)jl_function_type));
if (notcalled_func && (decl_i == (jl_value_t*)jl_any_type ||
decl_i == (jl_value_t*)jl_function_type ||
(jl_is_uniontype(decl_i) && // Base.Callable
((((jl_uniontype_t*)decl_i)->a == (jl_value_t*)jl_function_type &&
((jl_uniontype_t*)decl_i)->b == (jl_value_t*)jl_type_type) ||
(((jl_uniontype_t*)decl_i)->b == (jl_value_t*)jl_function_type &&
((jl_uniontype_t*)decl_i)->a == (jl_value_t*)jl_type_type))))) {
// and attempt to despecialize types marked Function, Callable, or Any
// when called with a subtype of Function but is not called
if (!*newparams) *newparams = jl_svec_copy(tt->parameters);
jl_svecset(*newparams, i, (jl_value_t*)jl_function_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 (jl_nparams(tt) >= nspec && jl_va_tuple_kind((jl_datatype_t*)decl) == JL_VARARG_UNBOUND) {
jl_svec_t *limited = jl_alloc_svec(nspec);
JL_GC_PUSH1(&limited);
if (!*newparams) *newparams = tt->parameters;
size_t i;
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)) {
all_are_subtypes = 0;
break;
}
}
if (all_are_subtypes) {
// avoid Vararg{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, (jl_value_t*)NULL));
}
else {
jl_value_t *unw = jl_unwrap_unionall(decl);
jl_value_t *lastdeclt = jl_tparam(unw, nargs - 1);
assert(jl_is_vararg_type(lastdeclt) && jl_nparams(unw) == nargs);
int nsp = jl_svec_len(sparams);
if (nsp > 0 && jl_has_free_typevars(lastdeclt)) {
assert(jl_subtype_env_size(decl) == nsp);
lastdeclt = jl_instantiate_type_in_env(lastdeclt, (jl_unionall_t*)decl, jl_svec_data(sparams));
// TODO: rewrap_unionall(lastdeclt, sparams) if any sparams isa TypeVar???
// TODO: if we made any replacements above, sparams may now be incorrect
}
jl_svecset(limited, i, lastdeclt);
}
*newparams = limited;
// now there is a problem: the widened 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.
// TODO: the above analysis assumes that there will never
// be a call attempted that should throw a no-method error
JL_GC_POP();
}
}
// compute whether this type signature is a possible return value from jl_compilation_sig given a concrete-type for `tt`
JL_DLLEXPORT int jl_isa_compileable_sig(
jl_tupletype_t *type,
jl_method_t *definition)
{
jl_value_t *decl = definition->sig;
if (!jl_is_datatype(type) || jl_has_free_typevars((jl_value_t*)type))
return 0;
size_t i, np = jl_nparams(type);
size_t nargs = definition->nargs; // == jl_nparams(jl_unwrap_unionall(decl));
if (np == 0)
return nargs == 0;
if (definition->generator) {
// staged functions aren't optimized
// so assume the caller was intelligent about calling us
return (definition->isva ? np >= nargs - 1 : np == nargs) && type->isdispatchtuple;
}
// for varargs methods, only specialize up to max_args (>= nargs + 1).
// 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 (definition->isva) {
unsigned nspec_min = nargs + 1; // min number of non-vararg values before vararg
unsigned nspec_max = INT32_MAX; // max number of non-vararg values before vararg
jl_methtable_t *mt = jl_method_table_for(decl);
if ((jl_value_t*)mt != jl_nothing) {
// try to refine estimate of min and max
if (mt != jl_type_type_mt && mt != jl_nonfunction_mt)
nspec_min = mt->max_args + 2;
else
nspec_max = nspec_min;
}
int isbound = (jl_va_tuple_kind((jl_datatype_t*)decl) == JL_VARARG_UNBOUND);
if (jl_is_vararg_type(jl_tparam(type, np - 1))) {
if (!isbound || np < nspec_min || np > nspec_max)
return 0;
}
else {
if (np < nargs - 1 || (isbound && np >= nspec_max))
return 0;
}
}
else if (np != nargs || jl_is_vararg_type(jl_tparam(type, np - 1))) {
return 0;
}
for (i = 0; i < np; i++) {
jl_value_t *elt = jl_tparam(type, i);
jl_value_t *decl_i = jl_nth_slot_type((jl_value_t*)decl, i);
size_t i_arg = (i < nargs - 1 ? i : nargs - 1);
if (jl_is_vararg_type(elt)) {
elt = jl_unwrap_vararg(elt);
if (jl_has_free_typevars(decl_i)) {
// TODO: in this case, answer semi-conservatively that these varargs are always compilable
// we don't have the ability to get sparams, so deciding if elt
// is a potential result of jl_instantiate_type_in_env for decl_i
// for any sparams that is consistent with the rest of the arguments
// seems like it would be extremely difficult
// and hopefully the upstream code probably gave us something reasonable
continue;
}
else if (jl_egal(elt, decl_i)) {
continue;
}
else if (jl_is_type_type(elt) && jl_is_type_type(jl_tparam0(elt))) {
return 0;
}
// else, it needs to meet the usual rules
}
if (i_arg > 0 && i_arg <= sizeof(definition->nospecialize) * 8 &&
(definition->nospecialize & (1 << (i_arg - 1)))) {
if (!jl_has_free_typevars(decl_i) && !jl_is_kind(decl_i)) {
if (jl_egal(elt, decl_i))
continue;
return 0;
}
}
if (jl_is_kind(elt)) {
// kind slots always get guard entries (checking for subtypes of Type)
if (jl_subtype(elt, decl_i) && !jl_subtype((jl_value_t*)jl_type_type, decl_i))
continue;
// TODO: other code paths that could reach here
return 0;
}
else if (jl_is_kind(decl_i)) {
return 0;
}
if (jl_is_type_type(jl_unwrap_unionall(elt))) {
if (jl_types_equal(elt, (jl_value_t*)jl_type_type)) {
if (very_general_type(decl_i))
continue;
if (i >= nargs && definition->isva)
continue;
return 0;
}
if (very_general_type(decl_i))
return 0;
if (!jl_is_datatype(elt))
return 0;
// if the declared type was not Any or Union{Type, ...},
// then the match must been with kind, such as UnionAll or DataType,
// and the result of matching the type signature
// needs to be corrected to the concrete type 'kind' (and not to Type)
jl_value_t *kind = jl_typeof(jl_tparam0(elt));
if (kind == jl_bottom_type)
return 0; // Type{Union{}} gets normalized to typeof(Union{})
if (jl_subtype(kind, decl_i) && !jl_subtype((jl_value_t*)jl_type_type, decl_i))
return 0; // gets turned into a kind
else if (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))) || !jl_has_free_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 < nargs || !definition->isva) {
jl_value_t *di = jl_type_intersection(decl_i, (jl_value_t*)jl_typetype_type);
JL_GC_PUSH1(&di);
assert(di != (jl_value_t*)jl_bottom_type);
if (jl_is_kind(di)) {
JL_GC_POP();
return 0;
}
else if (!jl_types_equal(di, elt)) {
JL_GC_POP();
return 0;
}
JL_GC_POP();
}
else {
return 0;
}
}
continue;
}
int notcalled_func = (i_arg > 0 && i_arg <= 8 && !(definition->called & (1 << (i_arg - 1))) &&
jl_subtype(elt, (jl_value_t*)jl_function_type));
if (notcalled_func && (decl_i == (jl_value_t*)jl_any_type ||
decl_i == (jl_value_t*)jl_function_type ||
(jl_is_uniontype(decl_i) && // Base.Callable
((((jl_uniontype_t*)decl_i)->a == (jl_value_t*)jl_function_type &&
((jl_uniontype_t*)decl_i)->b == (jl_value_t*)jl_type_type) ||
(((jl_uniontype_t*)decl_i)->b == (jl_value_t*)jl_function_type &&
((jl_uniontype_t*)decl_i)->a == (jl_value_t*)jl_type_type))))) {
// and attempt to despecialize types marked Function, Callable, or Any
// when called with a subtype of Function but is not called
if (elt == (jl_value_t*)jl_function_type)
continue;
return 0;
}
if (!jl_is_concrete_type(elt))
return 0;
}
return 1;
}
static jl_method_instance_t *cache_method(
jl_methtable_t *mt, jl_typemap_t **cache, jl_value_t *parent JL_PROPAGATES_ROOT,
jl_tupletype_t *tt, // the original tupletype of the signature
jl_method_t *definition,
size_t world,
jl_svec_t *sparams)
{
// caller must hold the mt->writelock
// short-circuit (now that we hold the lock) if this entry is already present
int8_t offs = mt ? jl_cachearg_offset(mt) : 1;
{ // scope block
struct jl_typemap_assoc search = {(jl_value_t*)tt, world, NULL, 0, ~(size_t)0};
jl_typemap_entry_t *entry = jl_typemap_assoc_by_type(*cache, &search, offs, /*subtype*/1);
if (entry && entry->func.value)
return entry->func.linfo;
}
jl_value_t *temp = NULL;
jl_value_t *temp2 = NULL;
jl_value_t *temp3 = NULL;
jl_method_instance_t *newmeth = NULL;
jl_svec_t *newparams = NULL;
JL_GC_PUSH5(&temp, &temp2, &temp3, &newmeth, &newparams);
int cache_with_orig = 1;
jl_tupletype_t *compilationsig = tt;
intptr_t nspec = (mt == NULL || mt == jl_type_type_mt || mt == jl_nonfunction_mt ? definition->nargs + 1 : mt->max_args + 2);
jl_compilation_sig(tt, sparams, definition, nspec, &newparams);
if (newparams) {
cache_with_orig = 0;
compilationsig = jl_apply_tuple_type(newparams);
temp2 = (jl_value_t*)compilationsig;
// In most cases `!jl_isa_compileable_sig(tt, definition))`,
// although for some cases, (notably Varargs)
// we might choose a replacement type that's preferable but not strictly better
}
// TODO: maybe assert(jl_isa_compileable_sig(compilationsig, definition));
newmeth = jl_specializations_get_linfo(definition, (jl_value_t*)compilationsig, sparams);
jl_tupletype_t *cachett = tt;
jl_svec_t* guardsigs = jl_emptysvec;
size_t min_valid = 1;
size_t max_valid = ~(size_t)0;
if (!cache_with_orig && mt) {
// now examine what will happen if we chose to use this sig in the cache
// TODO: should we first check `compilationsig <: definition`?
temp = ml_matches(mt->defs, 0, compilationsig, MAX_UNSPECIALIZED_CONFLICTS, 1, world, &min_valid, &max_valid);
int guards = 0;
if (temp == jl_false) {
cache_with_orig = 1;
}
else {
int unmatched_tvars = 0;
size_t i, l = jl_array_len(temp);
for (i = 0; i < l; i++) {
jl_value_t *m = jl_array_ptr_ref(temp, i);
jl_value_t *env = jl_svecref(m, 1);
int k, l;
for (k = 0, l = jl_svec_len(env); k < l; k++) {
if (jl_is_typevar(jl_svecref(env, k))) {
unmatched_tvars = 1;
break;
}
}