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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
static _Atomic(size_t) allow_new_worlds = 1;
JL_DLLEXPORT _Atomic(size_t) jl_world_counter = 1; // uses atomic acquire/release
JL_DLLEXPORT size_t jl_get_world_counter(void) JL_NOTSAFEPOINT
{
jl_task_t *ct = jl_current_task;
if (ct->ptls->in_pure_callback)
return ~(size_t)0;
return jl_atomic_load_acquire(&jl_world_counter);
}
JL_DLLEXPORT size_t jl_get_tls_world_age(void) JL_NOTSAFEPOINT
{
return jl_current_task->world_age;
}
// Compute the maximum number of times to unroll Varargs{T}, based on
// m->max_varargs (if specified) or a heuristic based on the maximum
// number of non-varargs arguments in the provided method table.
//
// If provided, `may_increase` is set to 1 if the returned value is
// heuristic-based and has a chance of increasing in the future.
static size_t get_max_varargs(
jl_method_t *m,
jl_methtable_t *kwmt,
jl_methtable_t *mt,
uint8_t *may_increase) JL_NOTSAFEPOINT
{
size_t max_varargs = 1;
if (may_increase != NULL)
*may_increase = 0;
if (m->max_varargs != UINT8_MAX)
max_varargs = m->max_varargs;
else if (kwmt != NULL && kwmt != jl_type_type_mt && kwmt != jl_nonfunction_mt && kwmt != jl_kwcall_mt) {
if (may_increase != NULL)
*may_increase = 1; // `max_args` can increase as new methods are inserted
max_varargs = jl_atomic_load_relaxed(&kwmt->max_args) + 2;
if (mt == jl_kwcall_mt)
max_varargs += 2;
max_varargs -= m->nargs;
}
return max_varargs;
}
/// ----- Handling for Julia callbacks ----- ///
JL_DLLEXPORT int8_t jl_is_in_pure_context(void)
{
jl_task_t *ct = jl_current_task;
return ct->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_task_t *ct = jl_current_task;
int last_in = ct->ptls->in_pure_callback;
JL_TRY {
ct->ptls->in_pure_callback = 1;
callback(tracee);
ct->ptls->in_pure_callback = last_in;
}
JL_CATCH {
ct->ptls->in_pure_callback = last_in;
jl_printf((JL_STREAM*)STDERR_FILENO, "WARNING: tracer callback function threw an error:\n");
jl_static_show((JL_STREAM*)STDERR_FILENO, jl_current_exception());
jl_printf((JL_STREAM*)STDERR_FILENO, "\n");
jlbacktrace(); // written to STDERR_FILENO
}
}
/// ----- Definitions for various internal TypeMaps ----- ///
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); // This must always happen inside the lock
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)
{
if (idx >= jl_svec_len(data))
return 0; // We got a OOB access, probably due to a data race
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
static jl_method_instance_t *jl_specializations_get_linfo_(jl_method_t *m JL_PROPAGATES_ROOT, jl_value_t *type, jl_svec_t *sparams, jl_method_instance_t *mi_insert)
{
if (m->sig == (jl_value_t*)jl_anytuple_type && jl_atomic_load_relaxed(&m->unspecialized) != NULL && m != jl_opaque_closure_method)
return jl_atomic_load_relaxed(&m->unspecialized); // handle builtin methods
jl_value_t *ut = jl_is_unionall(type) ? jl_unwrap_unionall(type) : type;
JL_TYPECHK(specializations, datatype, ut);
uint_t hv = ((jl_datatype_t*)ut)->hash;
jl_array_t *speckeyset = NULL;
jl_value_t *specializations = NULL;
size_t i = -1, cl = 0, lastcl;
for (int locked = 0; locked < 2; locked++) {
if (locked) {
if (!sparams) // can't insert without knowing this
return NULL;
JL_LOCK(&m->writelock);
}
lastcl = cl;
speckeyset = jl_atomic_load_acquire(&m->speckeyset);
specializations = jl_atomic_load_relaxed(&m->specializations);
if (specializations == (jl_value_t*)jl_emptysvec)
continue;
if (!jl_is_svec(specializations)) {
jl_method_instance_t *mi = (jl_method_instance_t*)specializations;
if (jl_types_equal(mi->specTypes, type)) {
if (locked)
JL_UNLOCK(&m->writelock);
return mi;
}
continue;
}
cl = jl_svec_len(specializations);
if (hv) {
ssize_t idx = jl_smallintset_lookup(speckeyset, speccache_eq, type, (jl_svec_t*)specializations, hv);
if (idx != -1) {
jl_method_instance_t *mi = (jl_method_instance_t*)jl_svecref(specializations, idx);
if (locked)
JL_UNLOCK(&m->writelock);
return mi;
}
}
else {
_Atomic(jl_method_instance_t*) *data = (_Atomic(jl_method_instance_t*)*)jl_svec_data(specializations);
JL_GC_PUSH1(&specializations); // clang-sa doesn't realize this loop uses specializations
// the last lastcl-i-1 elements are already checked when locked, so start search with the new elements only
for (i += cl - lastcl; i > 0; i--) {
jl_method_instance_t *mi = jl_atomic_load_relaxed(&data[i]);
if ((jl_value_t*)mi == jl_nothing)
break;
if (jl_types_equal(mi->specTypes, type)) {
if (locked)
JL_UNLOCK(&m->writelock);
JL_GC_POP();
return mi;
}
}
// i points to the first unchecked element, or the place to insert
JL_GC_POP();
}
}
jl_method_instance_t *mi = mi_insert ? mi_insert : jl_get_specialized(m, type, sparams);
if (specializations == (jl_value_t*)jl_emptysvec) {
jl_atomic_store_release(&m->specializations, (jl_value_t*)mi);
jl_gc_wb(m, mi);
}
else {
JL_GC_PUSH1(&mi);
if (!jl_is_svec(specializations)) {
jl_method_instance_t *mi = (jl_method_instance_t*)specializations;
jl_value_t *type = mi->specTypes;
jl_value_t *ut = jl_is_unionall(type) ? jl_unwrap_unionall(type) : type;
uint_t hv = ((jl_datatype_t*)ut)->hash;
cl = 7;
i = cl - 1;
specializations = (jl_value_t*)jl_svec_fill(cl, jl_nothing);
jl_svecset(specializations, hv ? 0 : i--, mi);
jl_atomic_store_release(&m->specializations, specializations);
jl_gc_wb(m, specializations);
if (hv)
jl_smallintset_insert(&m->speckeyset, (jl_value_t*)m, speccache_hash, 0, (jl_svec_t*)specializations);
}
if (hv) {
_Atomic(jl_method_instance_t*) *data = (_Atomic(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]);
if ((jl_value_t*)mi == jl_nothing)
break;
assert(!jl_types_equal(mi->specTypes, type));
}
// i points at the place to insert
}
if (hv ? (i + 1 >= cl || jl_svecref(specializations, i + 1) != jl_nothing) : (i <= 1 || jl_svecref(specializations, i - 2) != jl_nothing)) {
size_t ncl = cl < 7 ? 7 : (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);
for (int j = 0; j < ncl - cl; j++)
jl_svecset(nc, j+i, jl_nothing);
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));
specializations = (jl_value_t*)nc;
jl_atomic_store_release(&m->specializations, specializations);
jl_gc_wb(m, specializations);
if (!hv)
i += ncl - cl;
}
assert(jl_svecref(specializations, i) == jl_nothing);
jl_svecset(specializations, i, mi);
if (hv)
jl_smallintset_insert(&m->speckeyset, (jl_value_t*)m, speccache_hash, i, (jl_svec_t*)specializations);
JL_GC_POP();
}
JL_UNLOCK(&m->writelock); // may gc
return mi;
}
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)
{
return jl_specializations_get_linfo_(m, type, sparams, NULL);
}
jl_method_instance_t *jl_specializations_get_or_insert(jl_method_instance_t *mi)
{
jl_method_t *m = mi->def.method;
jl_value_t *type = mi->specTypes;
jl_svec_t *sparams = mi->sparam_vals;
return jl_specializations_get_linfo_(m, type, sparams, 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)
{
// TODO: this is sort of an odd lookup strategy (and the only user of
// jl_typemap_assoc_by_type with subtype=0), while normally jl_gf_invoke_lookup would be
// expected to be used instead
struct jl_typemap_assoc search = {type, world, NULL, 0, ~(size_t)0};
jl_typemap_entry_t *sf = jl_typemap_assoc_by_type(jl_atomic_load_relaxed(&mt->defs), &search, jl_cachearg_offset(mt), /*subtype*/0);
if (!sf)
return jl_nothing;
return sf->func.value;
}
// ----- MethodInstance specialization instantiation ----- //
JL_DLLEXPORT jl_code_instance_t* jl_new_codeinst(
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,
uint32_t ipo_effects, uint32_t effects, jl_value_t *argescapes,
uint8_t relocatability);
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;
m->nospecialize = 0;
m->nospecialize = ~m->nospecialize;
jl_methtable_t *mt = dt->name->mt;
jl_typemap_entry_t *newentry = NULL;
JL_GC_PUSH2(&m, &newentry);
newentry = jl_typemap_alloc(jl_anytuple_type, NULL, jl_emptysvec,
(jl_value_t*)m, 1, ~(size_t)0);
jl_typemap_insert(&mt->defs, (jl_value_t*)mt, newentry, jl_cachearg_offset(mt));
jl_method_instance_t *mi = jl_get_specialized(m, (jl_value_t*)jl_anytuple_type, jl_emptysvec);
jl_atomic_store_relaxed(&m->unspecialized, mi);
jl_gc_wb(m, mi);
jl_code_instance_t *codeinst = jl_new_codeinst(mi,
(jl_value_t*)jl_any_type, jl_nothing, jl_nothing,
0, 1, ~(size_t)0, 0, 0, jl_nothing, 0);
jl_mi_cache_insert(mi, codeinst);
jl_atomic_store_relaxed(&codeinst->specptr.fptr1, fptr);
jl_atomic_store_relaxed(&codeinst->invoke, jl_fptr_args);
newentry = jl_typemap_alloc(jl_anytuple_type, NULL, jl_emptysvec,
(jl_value_t*)mi, 1, ~(size_t)0);
jl_typemap_insert(&mt->cache, (jl_value_t*)mt, newentry, 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)
{
if (jl_typeinf_func == NULL)
return NULL;
jl_task_t *ct = jl_current_task;
if (ct->reentrant_timing & 0b1000) {
// We must avoid attempting to re-enter inference here
assert(0 && "attempted to enter inference while writing out image");
abort();
}
// In case we use higher bits later, mask them out
if ((ct->reentrant_timing & 0b1111) >= 0b110)
return NULL;
jl_code_info_t *src = NULL;
#ifdef ENABLE_INFERENCE
if (mi->inInference && !force)
return NULL;
JL_TIMING(INFERENCE, INFERENCE);
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);
jl_timing_show_method_instance(mi, JL_TIMING_DEFAULT_BLOCK);
#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
int last_errno = errno;
#ifdef _OS_WINDOWS_
DWORD last_error = GetLastError();
#endif
size_t last_age = ct->world_age;
ct->world_age = jl_typeinf_world;
mi->inInference = 1;
// first bit is for reentrant timing,
// so adding 1 to the bit above performs
// inference reentrancy counter addition.
// Note that this is only safe because
// the counter varies from 0-3; if we
// increase that limit, we'll need to
// allocate another bit for the counter.
ct->reentrant_timing += 0b10;
JL_TRY {
src = (jl_code_info_t*)jl_apply(fargs, 3);
}
JL_CATCH {
jl_value_t *e = jl_current_exception();
if (e == jl_stackovf_exception) {
jl_printf((JL_STREAM*)STDERR_FILENO, "Internal error: stack overflow in type inference of ");
jl_static_show_func_sig((JL_STREAM*)STDERR_FILENO, (jl_value_t*)mi->specTypes);
jl_printf((JL_STREAM*)STDERR_FILENO, ".\n");
jl_printf((JL_STREAM*)STDERR_FILENO, "This might be caused by recursion over very long tuples or argument lists.\n");
}
else {
jl_printf((JL_STREAM*)STDERR_FILENO, "Internal error: encountered unexpected error in runtime:\n");
jl_static_show((JL_STREAM*)STDERR_FILENO, e);
jl_printf((JL_STREAM*)STDERR_FILENO, "\n");
jlbacktrace(); // written to STDERR_FILENO
}
src = NULL;
}
ct->world_age = last_age;
ct->reentrant_timing -= 0b10;
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_task_t *ct = jl_current_task;
size_t last_age = ct->world_age;
ct->world_age = jl_typeinf_world;
jl_value_t *ret = jl_apply(args, nargs);
ct->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 = jl_atomic_load_relaxed(&mi->cache);
while (codeinst) {
if (codeinst->min_world <= min_world && max_world <= codeinst->max_world) {
jl_value_t *code = jl_atomic_load_relaxed(&codeinst->inferred);
if (code && (code == jl_nothing || jl_ir_flag_inferred(code)))
return (jl_value_t*)codeinst;
}
codeinst = jl_atomic_load_relaxed(&codeinst->next);
}
return (jl_value_t*)jl_nothing;
}
JL_DLLEXPORT jl_value_t *(*const jl_rettype_inferred_addr)(jl_method_instance_t *mi, size_t min_world, size_t max_world) JL_NOTSAFEPOINT = jl_rettype_inferred;
JL_DLLEXPORT jl_code_instance_t *jl_get_method_inferred(
jl_method_instance_t *mi JL_PROPAGATES_ROOT, jl_value_t *rettype,
size_t min_world, size_t max_world)
{
jl_code_instance_t *codeinst = jl_atomic_load_relaxed(&mi->cache);
while (codeinst) {
if (codeinst->min_world == min_world &&
codeinst->max_world == max_world &&
jl_egal(codeinst->rettype, rettype)) {
return codeinst;
}
codeinst = jl_atomic_load_relaxed(&codeinst->next);
}
codeinst = jl_new_codeinst(
mi, rettype, NULL, NULL,
0, min_world, max_world, 0, 0, jl_nothing, 0);
jl_mi_cache_insert(mi, codeinst);
return codeinst;
}
JL_DLLEXPORT jl_code_instance_t *jl_new_codeinst(
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,
uint32_t ipo_effects, uint32_t effects, jl_value_t *argescapes,
uint8_t relocatability
/*, jl_array_t *edges, int absolute_max*/)
{
jl_task_t *ct = jl_current_task;
assert(min_world <= max_world && "attempting to set invalid world constraints");
jl_code_instance_t *codeinst = (jl_code_instance_t*)jl_gc_alloc(ct->ptls, sizeof(jl_code_instance_t),
jl_code_instance_type);
codeinst->def = mi;
codeinst->min_world = min_world;
codeinst->max_world = max_world;
codeinst->rettype = rettype;
jl_atomic_store_release(&codeinst->inferred, inferred);
//codeinst->edges = NULL;
if ((const_flags & 2) == 0)
inferred_const = NULL;
codeinst->rettype_const = inferred_const;
jl_atomic_store_relaxed(&codeinst->specptr.fptr, NULL);
jl_atomic_store_relaxed(&codeinst->invoke, NULL);
if ((const_flags & 1) != 0) {
assert(const_flags & 2);
jl_atomic_store_relaxed(&codeinst->invoke, jl_fptr_const_return);
}
jl_atomic_store_relaxed(&codeinst->specsigflags, 0);
jl_atomic_store_relaxed(&codeinst->precompile, 0);
jl_atomic_store_relaxed(&codeinst->next, NULL);
codeinst->ipo_purity_bits = ipo_effects;
jl_atomic_store_relaxed(&codeinst->purity_bits, effects);
codeinst->argescapes = argescapes;
codeinst->relocatability = relocatability;
return codeinst;
}
JL_DLLEXPORT void jl_mi_cache_insert(jl_method_instance_t *mi JL_ROOTING_ARGUMENT,
jl_code_instance_t *ci JL_ROOTED_ARGUMENT JL_MAYBE_UNROOTED)
{
JL_GC_PUSH1(&ci);
if (jl_is_method(mi->def.method))
JL_LOCK(&mi->def.method->writelock);
jl_code_instance_t *oldci = jl_atomic_load_relaxed(&mi->cache);
jl_atomic_store_relaxed(&ci->next, oldci);
if (oldci)
jl_gc_wb(ci, oldci);
jl_atomic_store_release(&mi->cache, ci);
jl_gc_wb(mi, ci);
if (jl_is_method(mi->def.method))
JL_UNLOCK(&mi->def.method->writelock);
JL_GC_POP();
return;
}
static int get_method_unspec_list(jl_typemap_entry_t *def, void *closure)
{
size_t world = jl_atomic_load_acquire(&jl_world_counter);
jl_value_t *specializations = jl_atomic_load_relaxed(&def->func.method->specializations);
if (specializations == (jl_value_t*)jl_emptysvec)
return 1;
if (!jl_is_svec(specializations)) {
jl_method_instance_t *mi = (jl_method_instance_t*)specializations;
assert(jl_is_method_instance(mi));
if (jl_rettype_inferred(mi, world, world) == jl_nothing)
jl_array_ptr_1d_push((jl_array_t*)closure, (jl_value_t*)mi);
return 1;
}
size_t i, l = jl_svec_len(specializations);
JL_GC_PUSH1(&specializations);
for (i = 0; i < l; i++) {
jl_method_instance_t *mi = (jl_method_instance_t*)jl_svecref(specializations, i);
if ((jl_value_t*)mi != jl_nothing) {
assert(jl_is_method_instance(mi));
if (jl_rettype_inferred(mi, world, world) == jl_nothing)
jl_array_ptr_1d_push((jl_array_t*)closure, (jl_value_t*)mi);
}
}
JL_GC_POP();
return 1;
}
int foreach_mtable_in_module(
jl_module_t *m,
int (*visit)(jl_methtable_t *mt, void *env),
void *env)
{
jl_svec_t *table = jl_atomic_load_relaxed(&m->bindings);
for (size_t i = 0; i < jl_svec_len(table); i++) {
jl_binding_t *b = (jl_binding_t*)jl_svec_ref(table, i);
if ((void*)b == jl_nothing)
break;
jl_sym_t *name = b->globalref->name;
if (jl_atomic_load_relaxed(&b->owner) == b && b->constp) {
jl_value_t *v = jl_atomic_load_relaxed(&b->value);
if (v) {
jl_value_t *uw = jl_unwrap_unionall(v);
if (jl_is_datatype(uw)) {
jl_typename_t *tn = ((jl_datatype_t*)uw)->name;
if (tn->module == m && tn->name == name && tn->wrapper == v) {
// this is the original/primary binding for the type (name/wrapper)
jl_methtable_t *mt = tn->mt;
if (mt != NULL && (jl_value_t*)mt != jl_nothing && mt != jl_type_type_mt && mt != jl_nonfunction_mt) {
assert(mt->module == m);
if (!visit(mt, env))
return 0;
}
}
}
else if (jl_is_module(v)) {
jl_module_t *child = (jl_module_t*)v;
if (child != m && child->parent == m && child->name == name) {
// this is the original/primary binding for the submodule
if (!foreach_mtable_in_module(child, visit, env))
return 0;
}
}
else if (jl_is_mtable(v)) {
jl_methtable_t *mt = (jl_methtable_t*)v;
if (mt->module == m && mt->name == name) {
// this is probably an external method table here, so let's
// assume so as there is no way to precisely distinguish them
if (!visit(mt, env))
return 0;
}
}
}
}
table = jl_atomic_load_relaxed(&m->bindings);
}
return 1;
}
int jl_foreach_reachable_mtable(int (*visit)(jl_methtable_t *mt, void *env), void *env)
{
if (!visit(jl_type_type_mt, env))
return 0;
if (!visit(jl_nonfunction_mt, env))
return 0;
jl_array_t *mod_array = jl_get_loaded_modules();
if (mod_array) {
JL_GC_PUSH1(&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 (m->parent == m) // some toplevel modules (really just Base) aren't actually
if (!foreach_mtable_in_module(m, visit, env)) {
JL_GC_POP();
return 0;
}
}
JL_GC_POP();
}
else {
if (!foreach_mtable_in_module(jl_main_module, visit, env))
return 0;
if (!foreach_mtable_in_module(jl_core_module, visit, env))
return 0;
}
return 1;
}
static int reset_mt_caches(jl_methtable_t *mt, void *env)
{
// removes all method caches
// this might not be entirely safe (GC or MT), thus we only do it very early in bootstrapping
if (!mt->frozen) { // make sure not to reset builtin functions
jl_atomic_store_release(&mt->leafcache, (jl_array_t*)jl_an_empty_vec_any);
jl_atomic_store_release(&mt->cache, jl_nothing);
}
jl_typemap_visitor(jl_atomic_load_relaxed(&mt->defs), get_method_unspec_list, env);
return 1;
}
jl_function_t *jl_typeinf_func JL_GLOBALLY_ROOTED = NULL;
JL_DLLEXPORT size_t jl_typeinf_world = 1;
JL_DLLEXPORT void jl_set_typeinf_func(jl_value_t *f)
{
size_t newfunc = jl_typeinf_world == 1 && jl_typeinf_func == NULL;
jl_typeinf_func = (jl_function_t*)f;
jl_typeinf_world = jl_get_tls_world_age();
int world = jl_atomic_fetch_add(&jl_world_counter, 1) + 1; // make type-inference the only thing in this world
if (newfunc) {
// 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, world, world) == jl_nothing)
jl_type_infer(mi, world, 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) JL_NOTSAFEPOINT
{
sig = jl_unwrap_unionall(sig);
size_t len = jl_nparams(sig);
if (i < len-1)
return jl_tparam(sig, i);
jl_value_t *p = jl_tparam(sig, len-1);
if (jl_is_vararg(p))
p = jl_unwrap_vararg(p);
return p;
}
// 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 *inst_varargp_in_env(jl_value_t *decl, jl_svec_t *sparams)
{
jl_value_t *unw = jl_unwrap_unionall(decl);
jl_value_t *vm = jl_tparam(unw, jl_nparams(unw) - 1);
assert(jl_is_vararg(vm));
int nsp = jl_svec_len(sparams);
if (nsp > 0 && jl_has_free_typevars(vm)) {
JL_GC_PUSH1(&vm);
assert(jl_subtype_env_size(decl) == nsp);
vm = jl_instantiate_type_in_env(vm, (jl_unionall_t*)decl, jl_svec_data(sparams));
assert(jl_is_vararg(vm));
// rewrap_unionall(lastdeclt, sparams) if any sparams isa TypeVar
// for example, `Tuple{Vararg{Union{Nothing,Int,Val{T}}}} where T`
// and the user called it with `Tuple{Vararg{Union{Nothing,Int},N}}`, then T is unbound
jl_value_t **sp = jl_svec_data(sparams);
while (jl_is_unionall(decl)) {
jl_tvar_t *v = (jl_tvar_t*)*sp;
if (jl_is_typevar(v)) {
// must unwrap and re-wrap Vararg object explicitly here since jl_type_unionall handles it differently
jl_value_t *T = ((jl_vararg_t*)vm)->T;
jl_value_t *N = ((jl_vararg_t*)vm)->N;
int T_has_tv = T && jl_has_typevar(T, v);
int N_has_tv = N && jl_has_typevar(N, v); // n.b. JL_VARARG_UNBOUND check means this should be false
assert(!N_has_tv || N == (jl_value_t*)v);
vm = T_has_tv ? jl_type_unionall(v, T) : T;
if (N_has_tv)
N = NULL;
vm = (jl_value_t*)jl_wrap_vararg(vm, N, 1); // this cannot throw for these inputs
}
sp++;
decl = ((jl_unionall_t*)decl)->body;
nsp--;
}
assert(nsp == 0);
JL_GC_POP();
}
return vm;
}
static jl_value_t *ml_matches(jl_methtable_t *mt,
jl_tupletype_t *type, int lim, int include_ambiguous,
int intersections, size_t world, int cache_result,
size_t *min_valid, size_t *max_valid, int *ambig);
// get the compilation signature specialization for this method
static void jl_compilation_sig(
jl_tupletype_t *const tt, // the original tupletype of the call (or DataType from precompile)
jl_svec_t *sparams,
jl_method_t *definition,
intptr_t max_varargs,
// output:
jl_svec_t **const newparams JL_REQUIRE_ROOTED_SLOT)
{
assert(jl_is_tuple_type(tt));
jl_value_t *decl = definition->sig;
size_t nargs = definition->nargs; // == jl_nparams(jl_unwrap_unionall(decl));
size_t nspec = max_varargs + nargs;
if (definition->generator) {
// staged functions aren't optimized
// so assume the caller was intelligent about calling us
return;
}
if (decl == (jl_value_t*)jl_anytuple_type && jl_atomic_load_relaxed(&definition->unspecialized)) {
*newparams = jl_anytuple_type->parameters; // handle builtin methods
return;
}
// some early sanity checks
size_t i, np = jl_nparams(tt);
switch (jl_va_tuple_kind((jl_datatype_t*)decl)) {
case JL_VARARG_NONE:
if (jl_is_va_tuple(tt))
// odd
return;
if (np != nargs)
// there are not enough input parameters to make this into a compilation sig
return;
break;
case JL_VARARG_INT:
case JL_VARARG_BOUND:
if (jl_is_va_tuple(tt))
// the length needed is not known, but required for compilation
return;
if (np < nargs - 1)
// there are not enough input parameters to make this into a compilation sig
return;
break;
case JL_VARARG_UNBOUND:
if (np < nspec && jl_is_va_tuple(tt))
// there are insufficient given parameters for jl_isa_compileable_sig now to like this type
// (there were probably fewer methods defined when we first selected this signature, or
// the max varargs limit was not reached indicating the type is already fully-specialized)
return;
break;
}
jl_value_t *type_i = NULL;
JL_GC_PUSH1(&type_i);
for (i = 0; i < np; i++) {
jl_value_t *elt = jl_tparam(tt, i);
if (jl_is_vararg(elt))
elt = jl_unwrap_vararg(elt);
jl_value_t *decl_i = jl_nth_slot_type(decl, i);
type_i = jl_rewrap_unionall(decl_i, decl);
size_t i_arg = (i < nargs - 1 ? i : nargs - 1);
if (jl_is_kind(type_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 = type_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, type_i) && !jl_subtype((jl_value_t*)jl_type_type, type_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, type_i) && !jl_subtype((jl_value_t*)jl_type_type, type_i))) {
if (!*newparams) *newparams = jl_svec_copy(tt->parameters);
elt = (jl_value_t*)jl_type_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);
// n.b. it is possible here that !(elt <: decl_i), if elt was something unusual from intersection
// so this might narrow the result slightly, though still being compatible with the declared signature
jl_svecset(*newparams, i, (jl_value_t*)decl_i);
}
continue;
}
}
if (jl_types_equal(elt, (jl_value_t*)jl_type_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_type_type);
}
else if (jl_is_type_type(elt)) { // elt isa Type{T}
if (!jl_has_free_typevars(decl_i) && very_general_type(type_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.
But don't apply this heuristic if the argument is called (issue #36783).
*/
int iscalled = i_arg > 0 && i_arg <= 8 && (definition->called & (1 << (i_arg - 1)));
if (!iscalled) {
if (!*newparams) *newparams = jl_svec_copy(tt->parameters);
jl_svecset(*newparams, i, jl_type_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))) {
/*
actual argument was Type{...}, we computed its type as
Type{Type{...}}. we like to avoid unbounded nesting here, so
compile (and hopefully 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(type_i, (jl_value_t*)jl_type_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_type_type);
else
jl_svecset(*newparams, i, di);
}
else {
jl_svecset(*newparams, i, (jl_value_t*)jl_type_type);
}
}
}
int notcalled_func = (i_arg > 0 && i_arg <= 8 && !(definition->called & (1 << (i_arg - 1))) &&
!jl_has_free_typevars(decl_i) &&
jl_subtype(elt, (jl_value_t*)jl_function_type));
if (notcalled_func && (type_i == (jl_value_t*)jl_any_type ||
type_i == (jl_value_t*)jl_function_type ||
(jl_is_uniontype(type_i) && // Base.Callable
((((jl_uniontype_t*)type_i)->a == (jl_value_t*)jl_function_type &&
((jl_uniontype_t*)type_i)->b == (jl_value_t*)jl_type_type) ||
(((jl_uniontype_t*)type_i)->b == (jl_value_t*)jl_function_type &&
((jl_uniontype_t*)type_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 (np >= nspec && jl_va_tuple_kind((jl_datatype_t*)decl) == JL_VARARG_UNBOUND) {
if (!*newparams) *newparams = tt->parameters;
if (max_varargs > 0) {
type_i = jl_svecref(*newparams, nspec - 2);
} else {
// If max varargs is zero, always specialize to (Any...) since
// there is no preceding parameter to use for `type_i`
type_i = jl_bottom_type;
}
// if all subsequent arguments are subtypes of type_i, 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 = nspec - 1;
int all_are_subtypes = 1;
for (; j < jl_svec_len(*newparams); j++) {
jl_value_t *paramj = jl_svecref(*newparams, j);
if (jl_is_vararg(paramj))
paramj = jl_unwrap_vararg(paramj);
if (!jl_subtype(paramj, type_i)) {
all_are_subtypes = 0;
break;
}
}
if (all_are_subtypes) {
// avoid Vararg{Type{Type{...}}}
if (jl_is_type_type(type_i) && jl_is_type_type(jl_tparam0(type_i)))
type_i = (jl_value_t*)jl_type_type;
type_i = (jl_value_t*)jl_wrap_vararg(type_i, (jl_value_t*)NULL, 1); // this cannot throw for these inputs
}
else {
type_i = inst_varargp_in_env(decl, sparams);
}
jl_svec_t *limited = jl_alloc_svec(nspec);
size_t i;
for (i = 0; i < nspec - 1; i++) {
jl_svecset(limited, i, jl_svecref(*newparams, i));
}
jl_svecset(limited, i, type_i);