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builtins.c
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builtins.c
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// This file is a part of Julia. License is MIT: https://julialang.org/license
/*
implementations of built-in functions
*/
#include "platform.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <setjmp.h>
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#if defined(_OS_WINDOWS_)
#include <malloc.h>
#else
#include <unistd.h>
#endif
#include <ctype.h>
#include "julia.h"
#include "julia_internal.h"
#include "builtin_proto.h"
#include "intrinsics.h"
#include "julia_assert.h"
#ifdef __cplusplus
extern "C" {
#endif
// egal and object_id ---------------------------------------------------------
static int bits_equal(void *a, void *b, int sz) JL_NOTSAFEPOINT
{
switch (sz) {
case 1: return *(int8_t*)a == *(int8_t*)b;
// Let compiler constant folds the following.
case 2: return memcmp(a, b, 2) == 0;
case 4: return memcmp(a, b, 4) == 0;
case 8: return memcmp(a, b, 8) == 0;
default: return memcmp(a, b, sz) == 0;
}
}
// The frequently used jl_egal function deserves special attention when it
// comes to performance which is made challenging by the fact that the
// function has to handle quite a few different cases and because it is
// called recursively. To optimize performance many special cases are
// handle with separate comparisons which can dramatically reduce the run
// time of the function. The compiler can translate these simple tests
// with little effort, e.g., few registers are used.
//
// The complex cases require more effort and more registers to be translated
// efficiently. The effected cases include comparing tuples and fields. If
// the code to perform these operation would be inlined in the jl_egal
// function then the compiler would generate at the or close to the top of
// the function a prologue which saves all the callee-save registers and at
// the end the respective epilogue. The result is that even the fast cases
// are slowed down.
//
// The solution is to keep the code in jl_egal simple and split out the
// (more) complex cases into their own functions which are marked with
// NOINLINE.
static int NOINLINE compare_svec(jl_svec_t *a, jl_svec_t *b) JL_NOTSAFEPOINT
{
size_t l = jl_svec_len(a);
if (l != jl_svec_len(b))
return 0;
for(size_t i=0; i < l; i++) {
if (!jl_egal(jl_svecref(a,i),jl_svecref(b,i)))
return 0;
}
return 1;
}
// See comment above for an explanation of NOINLINE.
static int NOINLINE compare_fields(jl_value_t *a, jl_value_t *b, jl_datatype_t *dt) JL_NOTSAFEPOINT
{
size_t f, nf = jl_datatype_nfields(dt);
for (f = 0; f < nf; f++) {
size_t offs = jl_field_offset(dt, f);
char *ao = (char*)jl_data_ptr(a) + offs;
char *bo = (char*)jl_data_ptr(b) + offs;
if (jl_field_isptr(dt, f)) {
jl_value_t *af = *(jl_value_t**)ao;
jl_value_t *bf = *(jl_value_t**)bo;
if (af != bf) {
if (af == NULL || bf == NULL)
return 0;
if (!jl_egal(af, bf))
return 0;
}
}
else {
jl_datatype_t *ft = (jl_datatype_t*)jl_field_type_concrete(dt, f);
if (jl_is_uniontype(ft)) {
uint8_t asel = ((uint8_t*)ao)[jl_field_size(dt, f) - 1];
uint8_t bsel = ((uint8_t*)bo)[jl_field_size(dt, f) - 1];
if (asel != bsel)
return 0;
ft = (jl_datatype_t*)jl_nth_union_component((jl_value_t*)ft, asel);
}
if (!ft->layout->haspadding) {
if (!bits_equal(ao, bo, ft->size))
return 0;
}
else {
assert(jl_datatype_nfields(ft) > 0);
if (!compare_fields((jl_value_t*)ao, (jl_value_t*)bo, ft))
return 0;
}
}
}
return 1;
}
static int egal_types(jl_value_t *a, jl_value_t *b, jl_typeenv_t *env) JL_NOTSAFEPOINT
{
if (a == b)
return 1;
jl_datatype_t *dt = (jl_datatype_t*)jl_typeof(a);
if (dt != (jl_datatype_t*)jl_typeof(b))
return 0;
if (dt == jl_tvar_type) {
jl_typeenv_t *pe = env;
while (pe != NULL) {
if (pe->var == (jl_tvar_t*)a)
return pe->val == b;
pe = pe->prev;
}
return 0;
}
if (dt == jl_uniontype_type) {
return egal_types(((jl_uniontype_t*)a)->a, ((jl_uniontype_t*)b)->a, env) &&
egal_types(((jl_uniontype_t*)a)->b, ((jl_uniontype_t*)b)->b, env);
}
if (dt == jl_unionall_type) {
jl_unionall_t *ua = (jl_unionall_t*)a;
jl_unionall_t *ub = (jl_unionall_t*)b;
if (ua->var->name != ub->var->name)
return 0;
if (!(egal_types(ua->var->lb, ub->var->lb, env) && egal_types(ua->var->ub, ub->var->ub, env)))
return 0;
jl_typeenv_t e = { ua->var, (jl_value_t*)ub->var, env };
return egal_types(ua->body, ub->body, &e);
}
if (dt == jl_datatype_type) {
jl_datatype_t *dta = (jl_datatype_t*)a;
jl_datatype_t *dtb = (jl_datatype_t*)b;
if (dta->name != dtb->name)
return 0;
size_t i, l = jl_nparams(dta);
if (jl_nparams(dtb) != l)
return 0;
for (i = 0; i < l; i++) {
if (!egal_types(jl_tparam(dta, i), jl_tparam(dtb, i), env))
return 0;
}
return 1;
}
return jl_egal(a, b);
}
JL_DLLEXPORT int jl_egal(jl_value_t *a JL_MAYBE_UNROOTED, jl_value_t *b JL_MAYBE_UNROOTED) JL_NOTSAFEPOINT
{
// warning: a,b may NOT have been gc-rooted by the caller
if (a == b)
return 1;
jl_datatype_t *dt = (jl_datatype_t*)jl_typeof(a);
if (dt != (jl_datatype_t*)jl_typeof(b))
return 0;
if (dt == jl_simplevector_type)
return compare_svec((jl_svec_t*)a, (jl_svec_t*)b);
if (dt == jl_datatype_type) {
jl_datatype_t *dta = (jl_datatype_t*)a;
jl_datatype_t *dtb = (jl_datatype_t*)b;
return dta->name == dtb->name && compare_svec(dta->parameters, dtb->parameters);
}
if (dt == jl_string_type) {
size_t l = jl_string_len(a);
if (jl_string_len(b) != l)
return 0;
return !memcmp(jl_string_data(a), jl_string_data(b), l);
}
if (dt->mutabl)
return 0;
size_t sz = jl_datatype_size(dt);
if (sz == 0)
return 1;
size_t nf = jl_datatype_nfields(dt);
if (nf == 0)
return bits_equal(jl_data_ptr(a), jl_data_ptr(b), sz);
if (dt == jl_unionall_type)
return egal_types(a, b, NULL);
return compare_fields(a, b, dt);
}
// object_id ------------------------------------------------------------------
static uintptr_t bits_hash(const void *b, size_t sz) JL_NOTSAFEPOINT
{
switch (sz) {
case 1: return int32hash(*(const int8_t*)b);
case 2: return int32hash(jl_load_unaligned_i16(b));
case 4: return int32hash(jl_load_unaligned_i32(b));
#ifdef _P64
case 8: return int64hash(jl_load_unaligned_i64(b));
#else
case 8: return int64to32hash(jl_load_unaligned_i64(b));
#endif
default:
#ifdef _P64
return memhash((const char*)b, sz);
#else
return memhash32((const char*)b, sz);
#endif
}
}
static uintptr_t NOINLINE hash_svec(jl_svec_t *v) JL_NOTSAFEPOINT
{
uintptr_t h = 0;
size_t i, l = jl_svec_len(v);
for (i = 0; i < l; i++) {
jl_value_t *x = jl_svecref(v, i);
uintptr_t u = (x == NULL) ? 0 : jl_object_id(x);
h = bitmix(h, u);
}
return h;
}
typedef struct _varidx {
jl_tvar_t *var;
struct _varidx *prev;
} jl_varidx_t;
JL_DLLEXPORT uintptr_t jl_object_id_(jl_value_t *tv, jl_value_t *v) JL_NOTSAFEPOINT;
static uintptr_t type_object_id_(jl_value_t *v, jl_varidx_t *env) JL_NOTSAFEPOINT
{
if (v == NULL) return 0;
jl_datatype_t *tv = (jl_datatype_t*)jl_typeof(v);
if (tv == jl_tvar_type) {
jl_varidx_t *pe = env;
int i = 0;
while (pe != NULL) {
if (pe->var == (jl_tvar_t*)v)
return (i<<8) + 42;
i++;
pe = pe->prev;
}
return inthash((uintptr_t)v);
}
if (tv == jl_uniontype_type) {
return bitmix(bitmix(jl_object_id((jl_value_t*)tv),
type_object_id_(((jl_uniontype_t*)v)->a, env)),
type_object_id_(((jl_uniontype_t*)v)->b, env));
}
if (tv == jl_unionall_type) {
jl_unionall_t *u = (jl_unionall_t*)v;
uintptr_t h = u->var->name->hash;
h = bitmix(h, type_object_id_(u->var->lb, env));
h = bitmix(h, type_object_id_(u->var->ub, env));
jl_varidx_t e = { u->var, env };
return bitmix(h, type_object_id_(u->body, &e));
}
if (tv == jl_datatype_type) {
uintptr_t h = ~((jl_datatype_t*)v)->name->hash;
size_t i, l = jl_nparams(v);
for (i = 0; i < l; i++) {
h = bitmix(h, type_object_id_(jl_tparam(v, i), env));
}
return h;
}
return jl_object_id_((jl_value_t*)tv, v);
}
JL_DLLEXPORT uintptr_t jl_object_id_(jl_value_t *tv, jl_value_t *v) JL_NOTSAFEPOINT
{
if (tv == (jl_value_t*)jl_symbol_type)
return ((jl_sym_t*)v)->hash;
if (tv == (jl_value_t*)jl_simplevector_type)
return hash_svec((jl_svec_t*)v);
jl_datatype_t *dt = (jl_datatype_t*)tv;
if (dt == jl_datatype_type) {
jl_datatype_t *dtv = (jl_datatype_t*)v;
// `name->wrapper` is cacheable even though it contains TypeVars
// that don't have stable IDs.
//if (jl_egal(dtv->name->wrapper, v))
// return bitmix(~dtv->name->hash, 0xaa5566aa);
return bitmix(~dtv->name->hash, hash_svec(dtv->parameters));
}
if (dt == jl_typename_type)
return ((jl_typename_t*)v)->hash;
if (dt == jl_string_type) {
#ifdef _P64
return memhash_seed(jl_string_data(v), jl_string_len(v), 0xedc3b677);
#else
return memhash32_seed(jl_string_data(v), jl_string_len(v), 0xedc3b677);
#endif
}
if (dt->mutabl)
return inthash((uintptr_t)v);
size_t sz = jl_datatype_size(tv);
uintptr_t h = jl_object_id(tv);
if (sz == 0)
return ~h;
size_t f, nf = jl_datatype_nfields(dt);
if (nf == 0)
return bits_hash(jl_data_ptr(v), sz) ^ h;
if (dt == jl_unionall_type)
return type_object_id_(v, NULL);
for (f = 0; f < nf; f++) {
size_t offs = jl_field_offset(dt, f);
char *vo = (char*)jl_data_ptr(v) + offs;
uintptr_t u;
if (jl_field_isptr(dt, f)) {
jl_value_t *f = *(jl_value_t**)vo;
u = (f == NULL) ? 0 : jl_object_id(f);
}
else {
jl_datatype_t *fieldtype = (jl_datatype_t*)jl_field_type_concrete(dt, f);
if (jl_is_uniontype(fieldtype)) {
uint8_t sel = ((uint8_t*)vo)[jl_field_size(dt, f) - 1];
fieldtype = (jl_datatype_t*)jl_nth_union_component((jl_value_t*)fieldtype, sel);
}
assert(jl_is_datatype(fieldtype) && !fieldtype->abstract && !fieldtype->mutabl);
if (fieldtype->layout->haspadding)
u = jl_object_id_((jl_value_t*)fieldtype, (jl_value_t*)vo);
else
u = bits_hash(vo, fieldtype->size);
}
h = bitmix(h, u);
}
return h;
}
JL_DLLEXPORT uintptr_t jl_object_id(jl_value_t *v) JL_NOTSAFEPOINT
{
return jl_object_id_(jl_typeof(v), v);
}
// eq hash table --------------------------------------------------------------
#include "table.c"
// object model and type primitives -------------------------------------------
JL_CALLABLE(jl_f_is)
{
JL_NARGS(===, 2, 2);
if (args[0] == args[1])
return jl_true;
return jl_egal(args[0], args[1]) ? jl_true : jl_false;
}
JL_CALLABLE(jl_f_typeof)
{
JL_NARGS(typeof, 1, 1);
return jl_typeof(args[0]);
}
JL_CALLABLE(jl_f_sizeof)
{
JL_NARGS(sizeof, 1, 1);
jl_value_t *x = args[0];
if (jl_is_unionall(x) || jl_is_uniontype(x)) {
x = jl_unwrap_unionall(x);
size_t elsize = 0, al = 0;
int isinline = jl_islayout_inline(x, &elsize, &al);
if (isinline)
return jl_box_long(elsize);
if (!jl_is_datatype(x))
jl_error("Argument is an abstract type and does not have a definite size.");
}
if (jl_is_datatype(x)) {
jl_datatype_t *dx = (jl_datatype_t*)x;
if (dx->layout == NULL) {
if (dx->abstract)
jl_errorf("Abstract type %s does not have a definite size.", jl_symbol_name(dx->name->name));
else
jl_errorf("Argument is an incomplete %s type and does not have a definite size.", jl_symbol_name(dx->name->name));
}
if (jl_is_layout_opaque(dx->layout))
jl_errorf("Type %s does not have a definite size.", jl_symbol_name(dx->name->name));
return jl_box_long(jl_datatype_size(x));
}
if (x == jl_bottom_type)
jl_error("The empty type does not have a definite size since it does not have instances.");
if (jl_is_array(x)) {
return jl_box_long(jl_array_len(x) * ((jl_array_t*)x)->elsize);
}
if (jl_is_string(x))
return jl_box_long(jl_string_len(x));
if (jl_is_symbol(x))
return jl_box_long(strlen(jl_symbol_name((jl_sym_t*)x)));
if (jl_is_svec(x))
return jl_box_long((1+jl_svec_len(x))*sizeof(void*));
jl_datatype_t *dt = (jl_datatype_t*)jl_typeof(x);
assert(jl_is_datatype(dt));
assert(!dt->abstract);
return jl_box_long(jl_datatype_size(dt));
}
JL_CALLABLE(jl_f_issubtype)
{
JL_NARGS(<:, 2, 2);
jl_value_t *a = args[0], *b = args[1];
JL_TYPECHK(<:, type, a);
JL_TYPECHK(<:, type, b);
return (jl_subtype(a,b) ? jl_true : jl_false);
}
JL_CALLABLE(jl_f_isa)
{
JL_NARGS(isa, 2, 2);
JL_TYPECHK(isa, type, args[1]);
return (jl_isa(args[0],args[1]) ? jl_true : jl_false);
}
JL_CALLABLE(jl_f_typeassert)
{
JL_NARGS(typeassert, 2, 2);
JL_TYPECHK(typeassert, type, args[1]);
if (!jl_isa(args[0],args[1]))
jl_type_error("typeassert", args[1], args[0]);
return args[0];
}
JL_CALLABLE(jl_f_throw)
{
JL_NARGS(throw, 1, 1);
jl_throw(args[0]);
return jl_nothing;
}
JL_CALLABLE(jl_f_ifelse)
{
JL_NARGS(ifelse, 3, 3);
JL_TYPECHK(ifelse, bool, args[0]);
return (args[0] == jl_false ? args[2] : args[1]);
}
// apply ----------------------------------------------------------------------
static NOINLINE jl_svec_t *_copy_to(size_t newalloc, jl_value_t **oldargs, size_t oldalloc)
{
size_t j;
jl_svec_t *newheap = jl_alloc_svec_uninit(newalloc);
jl_value_t **newargs = jl_svec_data(newheap);
for (j = 0; j < oldalloc; j++)
newargs[j] = oldargs[j];
for (; j < newalloc; j++)
newargs[j] = NULL;
return newheap;
}
void STATIC_INLINE _grow_to(jl_value_t **root, jl_value_t ***oldargs, jl_svec_t **arg_heap, size_t *n_alloc, size_t newalloc, size_t extra)
{
size_t oldalloc = *n_alloc;
if (oldalloc >= newalloc)
return;
if (extra)
// grow by an extra 50% if newalloc is still only a guess
newalloc += oldalloc / 2 + 16;
jl_svec_t *newheap = _copy_to(newalloc, *oldargs, oldalloc);
*root = (jl_value_t*)newheap;
*arg_heap = newheap;
*oldargs = jl_svec_data(newheap);
*n_alloc = newalloc;
}
static jl_function_t *jl_iterate_func JL_GLOBALLY_ROOTED;
static jl_value_t *do_apply(jl_value_t *F, jl_value_t **args, uint32_t nargs, jl_value_t *iterate)
{
jl_function_t *f = args[0];
if (nargs == 2) {
// some common simple cases
if (f == jl_builtin_svec) {
if (jl_is_svec(args[1]))
return args[1];
if (jl_is_array(args[1])) {
size_t n = jl_array_len(args[1]);
jl_svec_t *t = jl_alloc_svec(n);
JL_GC_PUSH1(&t);
for (size_t i = 0; i < n; i++) {
jl_svecset(t, i, jl_arrayref((jl_array_t*)args[1], i));
}
JL_GC_POP();
return (jl_value_t*)t;
}
}
else if (f == jl_builtin_tuple && jl_is_tuple(args[1])) {
return args[1];
}
}
// estimate how many real arguments we appear to have
size_t precount = 1;
size_t extra = 0;
size_t i;
for (i = 1; i < nargs; i++) {
if (jl_is_svec(args[i])) {
precount += jl_svec_len(args[i]);
}
else if (jl_is_tuple(args[i]) || jl_is_namedtuple(args[i])) {
precount += jl_nfields(args[i]);
}
else if (jl_is_array(args[i])) {
precount += jl_array_len(args[i]);
}
else {
extra += 1;
}
}
if (extra && iterate == NULL) {
if (jl_iterate_func == NULL) {
jl_iterate_func = jl_get_function(jl_top_module, "iterate");
if (jl_iterate_func == NULL)
jl_undefined_var_error(jl_symbol("iterate"));
}
iterate = jl_iterate_func;
}
// allocate space for the argument array and gc roots for it
// based on our previous estimates
// use the stack if we have a good estimate that it is small
// otherwise, use the heap and grow it incrementally
// and if there are any extra elements, we'll also need a couple extra roots
int onstack = (precount + 32 * extra < jl_page_size / sizeof(jl_value_t*));
size_t stackalloc = onstack ? (precount + 4 * extra + (extra ? 16 : 0)) : 1;
size_t n_alloc;
jl_value_t **roots;
JL_GC_PUSHARGS(roots, stackalloc + (extra ? 2 : 0));
jl_value_t **newargs;
jl_svec_t *arg_heap = NULL;
if (onstack) {
newargs = roots;
n_alloc = stackalloc;
}
else {
// put arguments on the heap if there are too many
newargs = NULL;
n_alloc = 0;
assert(precount > 0); // let optimizer know this won't overflow
_grow_to(&roots[0], &newargs, &arg_heap, &n_alloc, precount, extra);
}
newargs[0] = f;
precount -= 1;
size_t n = 1;
for (i = 1; i < nargs; i++) {
jl_value_t *ai = args[i];
if (jl_is_svec(ai)) {
jl_svec_t *t = (jl_svec_t*)ai;
size_t j, al = jl_svec_len(t);
precount = (precount > al) ? precount - al : 0;
_grow_to(&roots[0], &newargs, &arg_heap, &n_alloc, n + precount + al, extra);
assert(newargs != NULL); // inform GCChecker that we didn't write a NULL here
for (j = 0; j < al; j++) {
newargs[n++] = jl_svecref(t, j);
// GC Note: here we assume that the return value of `jl_svecref`
// will not be young if `arg_heap` becomes old
// since they are allocated before `arg_heap`. Otherwise,
// we need to add write barrier for !onstack
}
}
else if (jl_is_tuple(ai) || jl_is_namedtuple(ai)) {
size_t j, al = jl_nfields(ai);
precount = (precount > al) ? precount - al : 0;
_grow_to(&roots[0], &newargs, &arg_heap, &n_alloc, n + precount + al, extra);
assert(newargs != NULL); // inform GCChecker that we didn't write a NULL here
for (j = 0; j < al; j++) {
// jl_fieldref may allocate.
newargs[n++] = jl_fieldref(ai, j);
if (arg_heap)
jl_gc_wb(arg_heap, newargs[n - 1]);
}
}
else if (jl_is_array(ai)) {
jl_array_t *aai = (jl_array_t*)ai;
size_t j, al = jl_array_len(aai);
precount = (precount > al) ? precount - al : 0;
_grow_to(&roots[0], &newargs, &arg_heap, &n_alloc, n + precount + al, extra);
assert(newargs != NULL); // inform GCChecker that we didn't write a NULL here
if (aai->flags.ptrarray) {
for (j = 0; j < al; j++) {
jl_value_t *arg = jl_array_ptr_ref(aai, j);
// apply with array splatting may have embedded NULL value (#11772)
if (__unlikely(arg == NULL))
jl_throw(jl_undefref_exception);
newargs[n++] = arg;
if (arg_heap)
jl_gc_wb(arg_heap, arg);
}
}
else {
for (j = 0; j < al; j++) {
newargs[n++] = jl_arrayref(aai, j);
if (arg_heap)
jl_gc_wb(arg_heap, newargs[n - 1]);
}
}
}
else {
assert(extra > 0);
jl_value_t *args[2];
args[0] = ai;
jl_value_t *next = jl_apply_generic(iterate, args, 1);
while (next != jl_nothing) {
roots[stackalloc] = next;
jl_value_t *value = jl_get_nth_field_checked(next, 0);
roots[stackalloc + 1] = value;
jl_value_t *state = jl_get_nth_field_checked(next, 1);
roots[stackalloc] = state;
_grow_to(&roots[0], &newargs, &arg_heap, &n_alloc, n + precount + 1, extra);
JL_GC_ASSERT_LIVE(value);
newargs[n++] = value;
if (arg_heap)
jl_gc_wb(arg_heap, value);
roots[stackalloc + 1] = NULL;
JL_GC_ASSERT_LIVE(state);
args[1] = state;
next = jl_apply_generic(iterate, args, 2);
}
roots[stackalloc] = NULL;
extra -= 1;
}
}
if (arg_heap) {
// optimization: keep only the first root, free the others
((void**)roots)[-2] = (void*)(((size_t)1) << 1);
}
jl_value_t *result = jl_apply(newargs, n);
JL_GC_POP();
return result;
}
JL_CALLABLE(jl_f__apply_iterate)
{
JL_NARGSV(_apply_iterate, 2);
return do_apply(F, args+1, nargs-1, args[0]);
}
JL_CALLABLE(jl_f__apply)
{
JL_NARGSV(_apply, 1);
return do_apply(F, args, nargs, NULL);
}
// this is like `_apply`, but with quasi-exact checks to make sure it is pure
JL_CALLABLE(jl_f__apply_pure)
{
jl_ptls_t ptls = jl_get_ptls_states();
int last_in = ptls->in_pure_callback;
jl_value_t *ret = NULL;
JL_TRY {
ptls->in_pure_callback = 1;
// because this function was declared pure,
// we should be allowed to run it in any world
// so we run it in the newest world;
// because, why not :)
// and `promote` works better this way
size_t last_age = ptls->world_age;
ptls->world_age = jl_world_counter;
ret = jl_f__apply(NULL, args, nargs);
ptls->world_age = last_age;
ptls->in_pure_callback = last_in;
}
JL_CATCH {
ptls->in_pure_callback = last_in;
jl_rethrow();
}
return ret;
}
// this is like `_apply`, but always runs in the newest world
JL_CALLABLE(jl_f__apply_latest)
{
jl_ptls_t ptls = jl_get_ptls_states();
size_t last_age = ptls->world_age;
if (!ptls->in_pure_callback)
ptls->world_age = jl_world_counter;
jl_value_t *ret = jl_f__apply(NULL, args, nargs);
ptls->world_age = last_age;
return ret;
}
// tuples ---------------------------------------------------------------------
JL_CALLABLE(jl_f_tuple)
{
size_t i;
if (nargs == 0)
return (jl_value_t*)jl_emptytuple;
jl_datatype_t *tt;
if (nargs < jl_page_size / sizeof(jl_value_t*)) {
jl_value_t **types = (jl_value_t**)alloca(nargs * sizeof(jl_value_t*));
for (i = 0; i < nargs; i++)
types[i] = jl_typeof(args[i]);
tt = jl_inst_concrete_tupletype_v(types, nargs);
}
else {
jl_svec_t *types = jl_alloc_svec_uninit(nargs);
JL_GC_PUSH1(&types);
for (i = 0; i < nargs; i++)
jl_svecset(types, i, jl_typeof(args[i]));
tt = jl_inst_concrete_tupletype(types);
JL_GC_POP();
}
return jl_new_structv(tt, args, nargs);
}
JL_CALLABLE(jl_f_svec)
{
size_t i;
if (nargs == 0) return (jl_value_t*)jl_emptysvec;
jl_svec_t *t = jl_alloc_svec_uninit(nargs);
for(i=0; i < nargs; i++) {
jl_svecset(t, i, args[i]);
}
return (jl_value_t*)t;
}
// struct operations ------------------------------------------------------------
JL_CALLABLE(jl_f_getfield)
{
if (nargs == 3) {
JL_TYPECHK(getfield, bool, args[2]);
nargs -= 1;
}
JL_NARGS(getfield, 2, 2);
jl_value_t *v = args[0];
jl_value_t *vt = (jl_value_t*)jl_typeof(v);
if (vt == (jl_value_t*)jl_module_type) {
JL_TYPECHK(getfield, symbol, args[1]);
return jl_eval_global_var((jl_module_t*)v, (jl_sym_t*)args[1]);
}
if (!jl_is_datatype(vt))
jl_type_error("getfield", (jl_value_t*)jl_datatype_type, v);
jl_datatype_t *st = (jl_datatype_t*)vt;
size_t idx;
if (jl_is_long(args[1])) {
idx = jl_unbox_long(args[1])-1;
if (idx >= jl_datatype_nfields(st))
jl_bounds_error(args[0], args[1]);
}
else {
JL_TYPECHK(getfield, symbol, args[1]);
jl_sym_t *fld = (jl_sym_t*)args[1];
idx = jl_field_index(st, fld, 1);
}
jl_value_t *fval = jl_get_nth_field(v, idx);
if (fval == NULL)
jl_throw(jl_undefref_exception);
return fval;
}
JL_CALLABLE(jl_f_setfield)
{
JL_NARGS(setfield!, 3, 3);
jl_value_t *v = args[0];
jl_value_t *vt = (jl_value_t*)jl_typeof(v);
if (vt == (jl_value_t*)jl_module_type)
jl_error("cannot assign variables in other modules");
if (!jl_is_datatype(vt))
jl_type_error("setfield!", (jl_value_t*)jl_datatype_type, v);
jl_datatype_t *st = (jl_datatype_t*)vt;
if (!st->mutabl)
jl_errorf("setfield! immutable struct of type %s cannot be changed", jl_symbol_name(st->name->name));
size_t idx;
if (jl_is_long(args[1])) {
idx = jl_unbox_long(args[1]) - 1;
if (idx >= jl_datatype_nfields(st))
jl_bounds_error(args[0], args[1]);
}
else {
JL_TYPECHK(setfield!, symbol, args[1]);
idx = jl_field_index(st, (jl_sym_t*)args[1], 1);
}
jl_value_t *ft = jl_field_type(st,idx);
if (!jl_isa(args[2], ft)) {
jl_type_error("setfield!", ft, args[2]);
}
jl_set_nth_field(v, idx, args[2]);
return args[2];
}
static jl_value_t *get_fieldtype(jl_value_t *t, jl_value_t *f, int dothrow)
{
if (jl_is_unionall(t)) {
jl_value_t *u = t;
JL_GC_PUSH1(&u);
u = get_fieldtype(((jl_unionall_t*)t)->body, f, dothrow);
u = jl_type_unionall(((jl_unionall_t*)t)->var, u);
JL_GC_POP();
return u;
}
if (jl_is_uniontype(t)) {
jl_value_t **u;
jl_value_t *r;
JL_GC_PUSHARGS(u, 2);
u[0] = get_fieldtype(((jl_uniontype_t*)t)->a, f, 0);
u[1] = get_fieldtype(((jl_uniontype_t*)t)->b, f, 0);
if (u[0] == jl_bottom_type && u[1] == jl_bottom_type && dothrow) {
// error if all types in the union might have
get_fieldtype(((jl_uniontype_t*)t)->a, f, 1);
get_fieldtype(((jl_uniontype_t*)t)->b, f, 1);
}
r = jl_type_union(u, 2);
JL_GC_POP();
return r;
}
if (!jl_is_datatype(t))
jl_type_error("fieldtype", (jl_value_t*)jl_datatype_type, t);
jl_datatype_t *st = (jl_datatype_t*)t;
int field_index;
if (jl_is_long(f)) {
field_index = jl_unbox_long(f) - 1;
}
else {
JL_TYPECHK(fieldtype, symbol, f);
field_index = jl_field_index(st, (jl_sym_t*)f, dothrow);
if (field_index == -1)
return jl_bottom_type;
}
if (st->name == jl_namedtuple_typename) {
jl_value_t *nm = jl_tparam0(st);
if (jl_is_tuple(nm)) {
int nf = jl_nfields(nm);
if (field_index < 0 || field_index >= nf) {
if (dothrow)
jl_bounds_error(t, f);
else
return jl_bottom_type;
}
}
jl_value_t *tt = jl_tparam1(st);
while (jl_is_typevar(tt))
tt = ((jl_tvar_t*)tt)->ub;
if (tt == (jl_value_t*)jl_any_type)
return (jl_value_t*)jl_any_type;
JL_GC_PUSH1(&f);
if (jl_is_symbol(f))
f = jl_box_long(field_index+1);
jl_value_t *ft = get_fieldtype(tt, f, dothrow);
JL_GC_POP();
return ft;
}
jl_svec_t *types = jl_get_fieldtypes(st);
int nf = jl_svec_len(types);
if (nf > 0 && field_index >= nf-1 && st->name == jl_tuple_typename) {
jl_value_t *ft = jl_field_type(st, nf-1);
if (jl_is_vararg_type(ft))
return jl_unwrap_vararg(ft);
}
if (field_index < 0 || field_index >= nf) {
if (dothrow)
jl_bounds_error(t, f);
else
return jl_bottom_type;
}
return jl_field_type(st, field_index);
}
JL_CALLABLE(jl_f_fieldtype)
{
if (nargs == 3) {
JL_TYPECHK(fieldtype, bool, args[2]);
nargs -= 1;
}
JL_NARGS(fieldtype, 2, 2);
jl_datatype_t *st = (jl_datatype_t*)args[0];
if (st == jl_module_type)
jl_error("cannot assign variables in other modules");
return get_fieldtype(args[0], args[1], 1);
}
JL_CALLABLE(jl_f_nfields)
{
JL_NARGS(nfields, 1, 1);
jl_datatype_t *xt = (jl_datatype_t*)jl_typeof(args[0]);
return jl_box_long(jl_datatype_nfields(xt));
}
JL_CALLABLE(jl_f_isdefined)
{
jl_module_t *m = NULL;
jl_sym_t *s = NULL;
JL_NARGS(isdefined, 2, 2);
if (!jl_is_module(args[0])) {
jl_datatype_t *vt = (jl_datatype_t*)jl_typeof(args[0]);
assert(jl_is_datatype(vt));
size_t idx;
if (jl_is_long(args[1])) {
idx = jl_unbox_long(args[1]) - 1;
if (idx >= jl_datatype_nfields(vt))
return jl_false;
}
else {
JL_TYPECHK(isdefined, symbol, args[1]);
idx = jl_field_index(vt, (jl_sym_t*)args[1], 0);
if ((int)idx == -1)
return jl_false;
}
return jl_field_isdefined(args[0], idx) ? jl_true : jl_false;
}
JL_TYPECHK(isdefined, module, args[0]);
JL_TYPECHK(isdefined, symbol, args[1]);
m = (jl_module_t*)args[0];
s = (jl_sym_t*)args[1];
return jl_boundp(m, s) ? jl_true : jl_false;
}
// apply_type -----------------------------------------------------------------
static int valid_type_param(jl_value_t *v)
{
if (jl_is_tuple(v)) {
// NOTE: tuples of symbols are not currently bits types, but have been
// allowed as type parameters. this is a bit ugly.
jl_value_t *tt = jl_typeof(v);
size_t i, l = jl_nparams(tt);
for(i=0; i < l; i++) {
jl_value_t *pi = jl_tparam(tt,i);
if (!(pi == (jl_value_t*)jl_symbol_type || jl_isbits(pi)))
return 0;
}
return 1;
}
if (jl_is_vararg_type(v))
return 0;
// TODO: maybe more things
return jl_is_type(v) || jl_is_typevar(v) || jl_is_symbol(v) || jl_isbits(jl_typeof(v));
}
JL_CALLABLE(jl_f_apply_type)
{
JL_NARGSV(apply_type, 1);
int i;
if (args[0] == (jl_value_t*)jl_anytuple_type) {
for(i=1; i < nargs; i++) {
jl_value_t *pi = args[i];
// TODO: should possibly only allow Types and TypeVars, but see
// https://github.com/JuliaLang/julia/commit/85f45974a581ab9af955bac600b90d9ab00f093b#commitcomment-13041922
if (jl_is_vararg_type(pi)) {
if (i != nargs-1)
jl_type_error_rt("Tuple", "non-final parameter", (jl_value_t*)jl_type_type, pi);
}
else if (!valid_type_param(pi)) {
jl_type_error_rt("Tuple", "parameter", (jl_value_t*)jl_type_type, pi);
}
}
return (jl_value_t*)jl_apply_tuple_type_v(&args[1], nargs-1);
}
else if (args[0] == (jl_value_t*)jl_uniontype_type) {
// Union{} has extra restrictions, so it needs to be checked after
// substituting typevars (a valid_type_param check here isn't sufficient).
return (jl_value_t*)jl_type_union(&args[1], nargs-1);
}
else if (jl_is_unionall(args[0])) {
for(i=1; i < nargs; i++) {
jl_value_t *pi = args[i];
if (!valid_type_param(pi)) {
jl_type_error_rt("Type", "parameter",
jl_isa(pi, (jl_value_t*)jl_number_type) ?
(jl_value_t*)jl_long_type : (jl_value_t*)jl_type_type,
pi);
}
}
return jl_apply_type(args[0], &args[1], nargs-1);
}
jl_type_error("Type{...} expression", (jl_value_t*)jl_unionall_type, args[0]);
}
// generic function reflection ------------------------------------------------
JL_CALLABLE(jl_f_applicable)
{
JL_NARGSV(applicable, 1);
size_t world = jl_get_ptls_states()->world_age;
return jl_method_lookup(args, nargs, 1, world) != NULL ?
jl_true : jl_false;
}
JL_CALLABLE(jl_f_invoke)
{
JL_NARGSV(invoke, 2);
jl_value_t *argtypes = args[1];
JL_GC_PUSH1(&argtypes);
if (!jl_is_tuple_type(jl_unwrap_unionall(args[1])))
jl_type_error("invoke", (jl_value_t*)jl_anytuple_type_type, args[1]);
if (!jl_tuple_isa(&args[2], nargs - 2, (jl_datatype_t*)argtypes))
jl_error("invoke: argument type error");
jl_value_t *res = jl_gf_invoke(argtypes, args[0], &args[2], nargs - 1);
JL_GC_POP();
return res;
}