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module.c
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module.c
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// This file is a part of Julia. License is MIT: https://julialang.org/license
/*
modules and top-level bindings
*/
#include <assert.h>
#include "julia.h"
#include "julia_internal.h"
#ifdef __cplusplus
extern "C" {
#endif
jl_module_t *jl_main_module=NULL;
jl_module_t *jl_core_module=NULL;
jl_module_t *jl_base_module=NULL;
jl_module_t *jl_top_module=NULL;
jl_module_t *jl_current_module=NULL;
jl_module_t *jl_new_module(jl_sym_t *name)
{
jl_module_t *m = (jl_module_t*)allocobj(sizeof(jl_module_t));
jl_set_typeof(m, jl_module_type);
JL_GC_PUSH1(&m);
assert(jl_is_symbol(name));
m->name = name;
m->parent = NULL;
m->constant_table = NULL;
m->call_func = NULL;
m->istopmod = 0;
m->uuid = uv_now(uv_default_loop());
htable_new(&m->bindings, 0);
arraylist_new(&m->usings, 0);
if (jl_core_module) {
jl_module_using(m, jl_core_module);
}
// export own name, so "using Foo" makes "Foo" itself visible
jl_set_const(m, name, (jl_value_t*)m);
jl_module_export(m, name);
JL_GC_POP();
return m;
}
DLLEXPORT jl_value_t *jl_f_new_module(jl_sym_t *name, uint8_t std_imports)
{
jl_module_t *m = jl_new_module(name);
JL_GC_PUSH1(&m);
m->parent = jl_main_module;
gc_wb(m, m->parent);
if (std_imports) jl_add_standard_imports(m);
JL_GC_POP();
return (jl_value_t*)m;
}
DLLEXPORT void jl_set_istopmod(uint8_t isprimary)
{
jl_current_module->istopmod = 1;
if (isprimary)
jl_top_module = jl_current_module;
}
DLLEXPORT uint8_t jl_istopmod(jl_module_t *mod)
{
return mod->istopmod;
}
static jl_binding_t *new_binding(jl_sym_t *name)
{
assert(jl_is_symbol(name));
jl_binding_t *b = (jl_binding_t*)allocb(sizeof(jl_binding_t));
b->name = name;
b->value = NULL;
b->type = (jl_value_t*)jl_any_type;
b->owner = NULL;
b->constp = 0;
b->exportp = 0;
b->imported = 0;
return b;
}
// get binding for assignment
DLLEXPORT jl_binding_t *jl_get_binding_wr(jl_module_t *m, jl_sym_t *var)
{
jl_binding_t **bp = (jl_binding_t**)ptrhash_bp(&m->bindings, var);
jl_binding_t *b;
if (*bp != HT_NOTFOUND) {
if ((*bp)->owner == NULL) {
(*bp)->owner = m;
return *bp;
}
else if ((*bp)->owner != m) {
// TODO: change this to an error soon
jl_printf(JL_STDERR,
"Warning: imported binding for %s overwritten in module %s\n", var->name, m->name->name);
}
else {
return *bp;
}
}
b = new_binding(var);
b->owner = m;
*bp = b;
gc_wb_buf(m, b);
return *bp;
}
// return module of binding
DLLEXPORT jl_module_t *jl_get_module_of_binding(jl_module_t *m, jl_sym_t *var)
{
jl_binding_t *b = jl_get_binding(m, var);
if (b == NULL)
jl_undefined_var_error(var);
return b->owner;
}
// get binding for adding a method
// like jl_get_binding_wr, but uses existing imports instead of warning
// and overwriting.
DLLEXPORT jl_binding_t *jl_get_binding_for_method_def(jl_module_t *m, jl_sym_t *var)
{
jl_binding_t **bp = (jl_binding_t**)ptrhash_bp(&m->bindings, var);
jl_binding_t *b = *bp;
if (b != HT_NOTFOUND) {
if (b->owner != m && b->owner != NULL) {
jl_binding_t *b2 = jl_get_binding(b->owner, var);
if (b2 == NULL)
jl_errorf("invalid method definition: imported function %s.%s does not exist", b->owner->name->name, var->name);
if (!b->imported && (b2->value==NULL || jl_is_function(b2->value))) {
if (b2->value && !jl_is_gf(b2->value)) {
jl_errorf("error in method definition: %s.%s cannot be extended", b->owner->name->name, var->name);
}
else {
jl_errorf("error in method definition: function %s.%s must be explicitly imported to be extended", b->owner->name->name, var->name);
}
}
return b2;
}
b->owner = m;
return b;
}
b = new_binding(var);
b->owner = m;
*bp = b;
gc_wb_buf(m, b);
return *bp;
}
static void module_import_(jl_module_t *to, jl_module_t *from, jl_sym_t *s,
int explici);
typedef struct _modstack_t {
jl_module_t *m;
struct _modstack_t *prev;
} modstack_t;
// get binding for reading. might return NULL for unbound.
static jl_binding_t *jl_get_binding_(jl_module_t *m, jl_sym_t *var, modstack_t *st)
{
modstack_t top = { m, st };
modstack_t *tmp = st;
while (tmp != NULL) {
if (tmp->m == m) {
// import cycle without finding actual location
return NULL;
}
tmp = tmp->prev;
}
jl_binding_t *b = (jl_binding_t*)ptrhash_get(&m->bindings, var);
if (b == HT_NOTFOUND || b->owner == NULL) {
jl_module_t *owner = NULL;
for(int i=(int)m->usings.len-1; i >= 0; --i) {
jl_module_t *imp = (jl_module_t*)m->usings.items[i];
jl_binding_t *tempb = (jl_binding_t*)ptrhash_get(&imp->bindings, var);
if (tempb != HT_NOTFOUND && tempb->exportp) {
tempb = jl_get_binding_(imp, var, &top);
if (tempb == NULL || tempb->owner == NULL)
// couldn't resolve; try next using (see issue #6105)
continue;
if (owner != NULL && tempb->owner != b->owner &&
!(tempb->constp && tempb->value && b->constp && b->value == tempb->value)) {
jl_printf(JL_STDERR,
"Warning: both %s and %s export \"%s\"; uses of it in module %s must be qualified\n",
owner->name->name, imp->name->name, var->name, m->name->name);
// mark this binding resolved, to avoid repeating the warning
(void)jl_get_binding_wr(m, var);
return NULL;
}
owner = imp;
b = tempb;
}
}
if (owner != NULL) {
// do a full import to prevent the result of this lookup
// from changing, for example if this var is assigned to
// later.
module_import_(m, b->owner, var, 0);
return b;
}
return NULL;
}
if (b->owner != m)
return jl_get_binding_(b->owner, var, &top);
return b;
}
DLLEXPORT jl_binding_t *jl_get_binding(jl_module_t *m, jl_sym_t *var)
{
return jl_get_binding_(m, var, NULL);
}
DLLEXPORT jl_binding_t *jl_get_binding_or_error(jl_module_t *m, jl_sym_t *var)
{
jl_binding_t *b = jl_get_binding_(m, var, NULL);
if (b == NULL)
jl_undefined_var_error(var);
return b;
}
static int eq_bindings(jl_binding_t *a, jl_binding_t *b)
{
if (a==b) return 1;
if (a->name == b->name && a->owner == b->owner) return 1;
if (a->constp && a->value && b->constp && b->value == a->value) return 1;
return 0;
}
// does module m explicitly import s?
int jl_is_imported(jl_module_t *m, jl_sym_t *s)
{
jl_binding_t **bp = (jl_binding_t**)ptrhash_bp(&m->bindings, s);
jl_binding_t *bto = *bp;
return (bto != HT_NOTFOUND && bto->imported);
}
// NOTE: we use explici since explicit is a C++ keyword
static void module_import_(jl_module_t *to, jl_module_t *from, jl_sym_t *s,
int explici)
{
if (to == from)
return;
jl_binding_t *b = jl_get_binding(from, s);
if (b == NULL) {
jl_printf(JL_STDERR,
"Warning: could not import %s.%s into %s\n",
from->name->name, s->name, to->name->name);
}
else {
jl_binding_t **bp = (jl_binding_t**)ptrhash_bp(&to->bindings, s);
jl_binding_t *bto = *bp;
if (bto != HT_NOTFOUND) {
if (bto == b) {
// importing a binding on top of itself. harmless.
}
else if (bto->owner == b->owner) {
// already imported
bto->imported = (explici!=0);
}
else if (bto->owner != to && bto->owner != NULL) {
// already imported from somewhere else
jl_binding_t *bval = jl_get_binding(to, s);
if (bval->constp && bval->value && b->constp && b->value == bval->value) {
// equivalent binding
bto->imported = (explici!=0);
return;
}
jl_printf(JL_STDERR,
"Warning: ignoring conflicting import of %s.%s into %s\n",
from->name->name, s->name, to->name->name);
}
else if (bto->constp || bto->value) {
// conflict with name owned by destination module
assert(bto->owner == to);
if (bto->constp && bto->value && b->constp && b->value == bto->value) {
// equivalent binding
return;
}
jl_printf(JL_STDERR,
"Warning: import of %s.%s into %s conflicts with an existing identifier; ignored.\n",
from->name->name, s->name, to->name->name);
}
else {
bto->owner = b->owner;
bto->imported = (explici!=0);
}
}
else {
jl_binding_t *nb = new_binding(s);
nb->owner = b->owner;
nb->imported = (explici!=0);
*bp = nb;
gc_wb_buf(to, nb);
}
}
}
void jl_module_import(jl_module_t *to, jl_module_t *from, jl_sym_t *s)
{
module_import_(to, from, s, 1);
}
void jl_module_use(jl_module_t *to, jl_module_t *from, jl_sym_t *s)
{
module_import_(to, from, s, 0);
}
void jl_module_importall(jl_module_t *to, jl_module_t *from)
{
void **table = from->bindings.table;
for(size_t i=1; i < from->bindings.size; i+=2) {
if (table[i] != HT_NOTFOUND) {
jl_binding_t *b = (jl_binding_t*)table[i];
if (b->exportp && (b->owner==from || b->imported))
jl_module_import(to, from, b->name);
}
}
}
void jl_module_using(jl_module_t *to, jl_module_t *from)
{
if (to == from)
return;
for(size_t i=0; i < to->usings.len; i++) {
if (from == to->usings.items[i])
return;
}
// print a warning if something visible via this "using" conflicts with
// an existing identifier. note that an identifier added later may still
// silently override a "using" name. see issue #2054.
void **table = from->bindings.table;
for(size_t i=1; i < from->bindings.size; i+=2) {
if (table[i] != HT_NOTFOUND) {
jl_binding_t *b = (jl_binding_t*)table[i];
if (b->exportp && (b->owner==from || b->imported)) {
jl_sym_t *var = (jl_sym_t*)table[i-1];
jl_binding_t **tobp = (jl_binding_t**)ptrhash_bp(&to->bindings, var);
if (*tobp != HT_NOTFOUND && (*tobp)->owner != NULL &&
// don't warn for conflicts with the module name itself.
// see issue #4715
var != to->name &&
!eq_bindings(jl_get_binding(to,var), b)) {
jl_printf(JL_STDERR,
"Warning: using %s.%s in module %s conflicts with an existing identifier.\n",
from->name->name, var->name, to->name->name);
}
}
}
}
arraylist_push(&to->usings, from);
}
void jl_module_export(jl_module_t *from, jl_sym_t *s)
{
jl_binding_t **bp = (jl_binding_t**)ptrhash_bp(&from->bindings, s);
if (*bp == HT_NOTFOUND) {
jl_binding_t *b = new_binding(s);
// don't yet know who the owner is
b->owner = NULL;
*bp = b;
gc_wb_buf(from, b);
}
assert(*bp != HT_NOTFOUND);
(*bp)->exportp = 1;
}
int jl_boundp(jl_module_t *m, jl_sym_t *var)
{
jl_binding_t *b = jl_get_binding(m, var);
return b && (b->value != NULL);
}
int jl_defines_or_exports_p(jl_module_t *m, jl_sym_t *var)
{
jl_binding_t **bp = (jl_binding_t**)ptrhash_bp(&m->bindings, var);
if (*bp == HT_NOTFOUND) return 0;
return (*bp)->exportp || (*bp)->owner==m;
}
int jl_binding_resolved_p(jl_module_t *m, jl_sym_t *var)
{
jl_binding_t **bp = (jl_binding_t**)ptrhash_bp(&m->bindings, var);
if (*bp == HT_NOTFOUND) return 0;
return (*bp)->owner != NULL;
}
jl_value_t *jl_get_global(jl_module_t *m, jl_sym_t *var)
{
jl_binding_t *b = jl_get_binding(m, var);
if (b == NULL) return NULL;
return b->value;
}
void jl_set_global(jl_module_t *m, jl_sym_t *var, jl_value_t *val)
{
jl_binding_t *bp = jl_get_binding_wr(m, var);
if (!bp->constp) {
bp->value = val;
gc_wb(m, val);
}
}
void jl_set_const(jl_module_t *m, jl_sym_t *var, jl_value_t *val)
{
jl_binding_t *bp = jl_get_binding_wr(m, var);
if (!bp->constp) {
bp->value = val;
bp->constp = 1;
gc_wb(m, val);
}
}
DLLEXPORT int jl_is_const(jl_module_t *m, jl_sym_t *var)
{
if (m == NULL) m = jl_current_module;
jl_binding_t *b = jl_get_binding(m, var);
return b && b->constp;
}
DLLEXPORT void jl_checked_assignment(jl_binding_t *b, jl_value_t *rhs)
{
if (b->constp && b->value != NULL) {
if (!jl_egal(rhs, b->value)) {
if (jl_typeof(rhs) != jl_typeof(b->value) ||
jl_is_type(rhs) || jl_is_function(rhs) || jl_is_module(rhs)) {
jl_errorf("invalid redefinition of constant %s", b->name->name);
}
jl_printf(JL_STDERR,"Warning: redefining constant %s\n",b->name->name);
}
}
b->value = rhs;
gc_wb_binding(b, rhs);
}
DLLEXPORT void jl_declare_constant(jl_binding_t *b)
{
if (b->value != NULL && !b->constp) {
jl_errorf("cannot declare %s constant; it already has a value",
b->name->name);
}
b->constp = 1;
}
DLLEXPORT jl_value_t *jl_get_current_module()
{
return (jl_value_t*)jl_current_module;
}
DLLEXPORT void jl_set_current_module(jl_value_t *m)
{
assert(jl_typeis(m, jl_module_type));
jl_current_module = (jl_module_t*)m;
}
DLLEXPORT jl_value_t *jl_module_usings(jl_module_t *m)
{
jl_array_t *a = jl_alloc_array_1d(jl_array_any_type, 0);
JL_GC_PUSH1(&a);
for(int i=(int)m->usings.len-1; i >= 0; --i) {
jl_array_grow_end(a, 1);
jl_module_t *imp = (jl_module_t*)m->usings.items[i];
jl_cellset(a,jl_array_dim0(a)-1, (jl_value_t*)imp);
}
JL_GC_POP();
return (jl_value_t*)a;
}
DLLEXPORT jl_value_t *jl_module_names(jl_module_t *m, int all, int imported)
{
jl_array_t *a = jl_alloc_array_1d(jl_array_symbol_type, 0);
JL_GC_PUSH1(&a);
size_t i;
void **table = m->bindings.table;
for(i=1; i < m->bindings.size; i+=2) {
if (table[i] != HT_NOTFOUND) {
jl_binding_t *b = (jl_binding_t*)table[i];
if (b->exportp || ((imported || b->owner == m) && (all || m == jl_main_module))) {
jl_array_grow_end(a, 1);
//XXX: change to jl_arrayset if array storage allocation for Array{Symbols,1} changes:
jl_cellset(a, jl_array_dim0(a)-1, (jl_value_t*)b->name);
}
}
}
JL_GC_POP();
return (jl_value_t*)a;
}
DLLEXPORT jl_sym_t *jl_module_name(jl_module_t *m) { return m->name; }
DLLEXPORT jl_module_t *jl_module_parent(jl_module_t *m) { return m->parent; }
DLLEXPORT uint64_t jl_module_uuid(jl_module_t *m) { return m->uuid; }
jl_function_t *jl_module_get_initializer(jl_module_t *m)
{
jl_value_t *f = jl_get_global(m, jl_symbol("__init__"));
if (f == NULL || !jl_is_function(f))
return NULL;
return (jl_function_t*)f;
}
void jl_module_run_initializer(jl_module_t *m)
{
jl_function_t *f = jl_module_get_initializer(m);
if (f == NULL)
return;
JL_TRY {
jl_apply(f, NULL, 0);
}
JL_CATCH {
jl_printf(JL_STDERR, "Warning: error initializing module %s:\n", m->name->name);
jl_static_show(JL_STDERR, jl_exception_in_transit);
jl_printf(JL_STDERR, "\n");
}
}
jl_function_t *jl_module_call_func(jl_module_t *m)
{
if (m->call_func == NULL) {
jl_function_t *cf = (jl_function_t*)jl_get_global(m, call_sym);
if (cf == NULL || !jl_is_function(cf))
cf = jl_bottom_func;
m->call_func = cf;
}
return m->call_func;
}
int jl_is_submodule(jl_module_t *child, jl_module_t *parent)
{
while (1) {
if (parent == child)
return 1;
if (child == NULL || child == child->parent)
return 0;
child = child->parent;
}
}
#ifdef __cplusplus
}
#endif