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gf.c
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gf.c
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// This file is a part of Julia. License is MIT: https://julialang.org/license
/*
Generic Functions
. method table and lookup
. GF constructor
. 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 _Atomic(size_t) jl_world_counter = 1; // uses atomic acquire/release
jl_mutex_t world_counter_lock;
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(ct));
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_value_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_value_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 && !m->is_for_opaque_closure)
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_genericmemory_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, specializations, hv, 0);
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, 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, 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};
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_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;
jl_atomic_store_relaxed(&m->primary_world, 1);
jl_atomic_store_relaxed(&m->deleted_world, ~(size_t)0);
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, jl_atomic_load_relaxed(&m->primary_world), jl_atomic_load_relaxed(&m->deleted_world));
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_nothing,
(jl_value_t*)jl_any_type, (jl_value_t*)jl_any_type, jl_nothing, jl_nothing,
0, 1, ~(size_t)0, 0, jl_nothing, 0, NULL);
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_instance_t *jl_type_infer(jl_method_instance_t *mi, size_t world, uint8_t source_mode)
{
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_instance_t *ci = NULL;
#ifdef ENABLE_INFERENCE
if (jl_engine_hasreserved(mi, jl_nothing)) // don't recur on a thread on the same MethodInstance--force it to interpret it until the inference has finished
return NULL;
JL_TIMING(INFERENCE, INFERENCE);
jl_value_t **fargs;
JL_GC_PUSHARGS(fargs, 4);
fargs[0] = (jl_value_t*)jl_typeinf_func;
fargs[1] = (jl_value_t*)mi;
fargs[2] = jl_box_ulong(world);
fargs[3] = jl_box_uint8(source_mode);
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
int last_pure = ct->ptls->in_pure_callback;
ct->ptls->in_pure_callback = 0;
size_t last_age = ct->world_age;
ct->world_age = jl_typeinf_world;
// 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 {
ci = (jl_code_instance_t*)jl_apply(fargs, 4);
}
JL_CATCH {
jl_value_t *e = jl_current_exception(ct);
jl_printf((JL_STREAM*)STDERR_FILENO, "Internal error: during type inference of\n");
jl_static_show_func_sig((JL_STREAM*)STDERR_FILENO, (jl_value_t*)mi->specTypes);
jl_printf((JL_STREAM*)STDERR_FILENO, "\nEncountered ");
if (e == jl_stackovf_exception) {
jl_printf((JL_STREAM*)STDERR_FILENO, "stack overflow.\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, "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
}
ci = NULL;
#ifndef JL_NDEBUG
abort();
#endif
}
ct->world_age = last_age;
ct->reentrant_timing -= 0b10;
ct->ptls->in_pure_callback = last_pure;
#ifdef _OS_WINDOWS_
SetLastError(last_error);
#endif
errno = last_errno;
if (ci && !jl_is_code_instance(ci)) {
ci = NULL;
}
JL_GC_POP();
#endif
return ci;
}
// Attempt to run `Core.Compiler.code_typed` on the lambda "mi"
JL_DLLEXPORT jl_code_info_t *jl_gdbcodetyped1(jl_method_instance_t *mi, size_t world)
{
jl_task_t *ct = jl_current_task;
jl_code_info_t *ci = NULL;
int last_errno = errno;
#ifdef _OS_WINDOWS_
DWORD last_error = GetLastError();
#endif
int last_pure = ct->ptls->in_pure_callback;
ct->ptls->in_pure_callback = 0;
size_t last_age = ct->world_age;
ct->world_age = jl_typeinf_world;
jl_value_t **fargs;
JL_GC_PUSHARGS(fargs, 4);
jl_module_t *CC = (jl_module_t*)jl_get_global(jl_core_module, jl_symbol("Compiler"));
if (CC != NULL && jl_is_module(CC)) {
fargs[0] = jl_get_global(CC, jl_symbol("NativeInterpreter"));;
fargs[1] = jl_box_ulong(world);
fargs[1] = jl_apply(fargs, 2);
fargs[0] = jl_get_global(CC, jl_symbol("typeinf_code"));
fargs[2] = (jl_value_t*)mi;
fargs[3] = jl_true;
ci = (jl_code_info_t*)jl_apply(fargs, 4);
}
ct->world_age = last_age;
ct->ptls->in_pure_callback = last_pure;
#ifdef _OS_WINDOWS_
SetLastError(last_error);
#endif
errno = last_errno;
if (ci && !jl_is_code_info(ci)) {
ci = NULL;
}
JL_GC_POP();
return ci;
}
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_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_debuginfo_t *edges)
{
jl_value_t *owner = jl_nothing; // TODO: owner should be arg
jl_code_instance_t *codeinst = jl_atomic_load_relaxed(&mi->cache);
while (codeinst) {
if (jl_atomic_load_relaxed(&codeinst->min_world) == min_world &&
jl_atomic_load_relaxed(&codeinst->max_world) == max_world &&
jl_egal(codeinst->owner, owner) &&
jl_egal(codeinst->rettype, rettype)) {
if (edges == NULL)
return codeinst;
jl_debuginfo_t *debuginfo = jl_atomic_load_relaxed(&codeinst->debuginfo);
if (edges == debuginfo)
return codeinst;
if (debuginfo == NULL && jl_atomic_cmpswap_relaxed(&codeinst->debuginfo, &debuginfo, edges))
return codeinst;
if (debuginfo && jl_egal((jl_value_t*)debuginfo, (jl_value_t*)edges))
return codeinst;
}
codeinst = jl_atomic_load_relaxed(&codeinst->next);
}
codeinst = jl_new_codeinst(
mi, owner, rettype, (jl_value_t*)jl_any_type, NULL, NULL,
0, min_world, max_world, 0, jl_nothing, 0, edges);
jl_mi_cache_insert(mi, codeinst);
return codeinst;
}
JL_DLLEXPORT int jl_mi_cache_has_ci(jl_method_instance_t *mi,
jl_code_instance_t *ci)
{
jl_code_instance_t *codeinst = jl_atomic_load_relaxed(&mi->cache);
while (codeinst) {
if (codeinst == ci)
return 1;
codeinst = jl_atomic_load_relaxed(&codeinst->next);
}
return 0;
}
JL_DLLEXPORT jl_code_instance_t *jl_new_codeinst(
jl_method_instance_t *mi, jl_value_t *owner,
jl_value_t *rettype, jl_value_t *exctype,
jl_value_t *inferred_const, jl_value_t *inferred,
int32_t const_flags, size_t min_world, size_t max_world,
uint32_t effects, jl_value_t *analysis_results,
uint8_t relocatability,
jl_debuginfo_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->owner = owner;
jl_atomic_store_relaxed(&codeinst->min_world, min_world);
jl_atomic_store_relaxed(&codeinst->max_world, max_world);
codeinst->rettype = rettype;
codeinst->exctype = exctype;
jl_atomic_store_release(&codeinst->inferred, inferred);
if ((const_flags & 2) == 0)
inferred_const = NULL;
codeinst->rettype_const = inferred_const;
jl_atomic_store_relaxed(&codeinst->debuginfo, (jl_value_t*)edges == jl_nothing ? NULL : edges);
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);
jl_atomic_store_relaxed(&codeinst->ipo_purity_bits, effects);
codeinst->analysis_results = analysis_results;
codeinst->relocatability = relocatability;
return codeinst;
}
JL_DLLEXPORT void jl_update_codeinst(
jl_code_instance_t *codeinst, jl_value_t *inferred,
int32_t const_flags, size_t min_world, size_t max_world,
uint32_t effects, jl_value_t *analysis_results,
uint8_t relocatability, jl_debuginfo_t *edges /* , int absolute_max*/)
{
codeinst->relocatability = relocatability;
codeinst->analysis_results = analysis_results;
jl_gc_wb(codeinst, analysis_results);
jl_atomic_store_relaxed(&codeinst->ipo_purity_bits, effects);
jl_atomic_store_relaxed(&codeinst->debuginfo, edges);
jl_gc_wb(codeinst, edges);
if ((const_flags & 1) != 0) {
assert(codeinst->rettype_const);
jl_atomic_store_release(&codeinst->invoke, jl_fptr_const_return);
}
jl_atomic_store_release(&codeinst->inferred, inferred);
jl_gc_wb(codeinst, inferred);
jl_atomic_store_relaxed(&codeinst->min_world, min_world); // XXX: these should be unchanged?
jl_atomic_store_relaxed(&codeinst->max_world, max_world); // since the edges shouldn't change after jl_fill_codeinst
}
JL_DLLEXPORT void jl_fill_codeinst(
jl_code_instance_t *codeinst,
jl_value_t *rettype, jl_value_t *exctype,
jl_value_t *inferred_const,
int32_t const_flags, size_t min_world, size_t max_world,
uint32_t effects, jl_value_t *analysis_results,
jl_debuginfo_t *edges /* , int absolute_max*/)
{
assert(min_world <= max_world && "attempting to set invalid world constraints");
codeinst->rettype = rettype;
jl_gc_wb(codeinst, rettype);
codeinst->exctype = exctype;
jl_gc_wb(codeinst, exctype);
if ((const_flags & 2) != 0) {
codeinst->rettype_const = inferred_const;
jl_gc_wb(codeinst, inferred_const);
}
jl_atomic_store_relaxed(&codeinst->debuginfo, (jl_value_t*)edges == jl_nothing ? NULL : edges);
jl_gc_wb(codeinst, edges);
if ((const_flags & 1) != 0) {
// TODO: may want to follow ordering restrictions here (see jitlayers.cpp)
assert(const_flags & 2);
jl_atomic_store_release(&codeinst->invoke, jl_fptr_const_return);
}
jl_atomic_store_relaxed(&codeinst->ipo_purity_bits, effects);
codeinst->analysis_results = analysis_results;
assert(jl_atomic_load_relaxed(&codeinst->min_world) == 1);
assert(jl_atomic_load_relaxed(&codeinst->max_world) == 0);
jl_atomic_store_release(&codeinst->inferred, jl_nothing);
jl_atomic_store_release(&codeinst->min_world, min_world);
jl_atomic_store_release(&codeinst->max_world, max_world);
}
JL_DLLEXPORT jl_code_instance_t *jl_new_codeinst_uninit(jl_method_instance_t *mi, jl_value_t *owner)
{
jl_code_instance_t *codeinst = jl_new_codeinst(mi, owner, NULL, NULL, NULL, NULL, 0, 0, 0, 0, NULL, 0, NULL);
jl_atomic_store_relaxed(&codeinst->min_world, 1); // make temporarily invalid before returning, so that jl_fill_codeinst is valid later
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;
}
JL_DLLEXPORT int jl_mi_try_insert(jl_method_instance_t *mi JL_ROOTING_ARGUMENT,
jl_code_instance_t *expected_ci,
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);
int ret = 0;
if (oldci == expected_ci) {
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);
ret = 1;
}
if (jl_is_method(mi->def.method))
JL_UNLOCK(&mi->def.method->writelock);
JL_GC_POP();
return ret;
}
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_native(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_native(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_svecref(table, i);
if ((void*)b == jl_nothing)
break;
jl_sym_t *name = b->globalref->name;
jl_value_t *v = jl_get_binding_value_if_const(b);
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_nrows(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_genericmemory_t*)jl_an_empty_memory_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_nrows(unspec); i < l; i++) {
jl_method_instance_t *mi = (jl_method_instance_t*)jl_array_ptr_ref(unspec, i);
if (jl_rettype_inferred_native(mi, world, world) == jl_nothing)
jl_type_infer(mi, world, SOURCE_MODE_NOT_REQUIRED);
}
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, 0); // 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;
}