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load.c
1467 lines (1323 loc) · 41.3 KB
/
load.c
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/*
* load methods from eval.c
*/
#include "dln.h"
#include "eval_intern.h"
#include "internal.h"
#include "internal/dir.h"
#include "internal/error.h"
#include "internal/file.h"
#include "internal/load.h"
#include "internal/parse.h"
#include "internal/thread.h"
#include "internal/variable.h"
#include "iseq.h"
#include "probes.h"
#include "ruby/encoding.h"
#include "ruby/util.h"
static VALUE ruby_dln_librefs;
#define IS_RBEXT(e) (strcmp((e), ".rb") == 0)
#define IS_SOEXT(e) (strcmp((e), ".so") == 0 || strcmp((e), ".o") == 0)
#define IS_DLEXT(e) (strcmp((e), DLEXT) == 0)
static const char *const loadable_ext[] = {
".rb", DLEXT,
0
};
static const char *const ruby_ext[] = {
".rb",
0
};
enum expand_type {
EXPAND_ALL,
EXPAND_RELATIVE,
EXPAND_HOME,
EXPAND_NON_CACHE
};
/* Construct expanded load path and store it to cache.
We rebuild load path partially if the cache is invalid.
We don't cache non string object and expand it every time. We ensure that
string objects in $LOAD_PATH are frozen.
*/
static void
rb_construct_expanded_load_path(rb_vm_t *vm, enum expand_type type, int *has_relative, int *has_non_cache)
{
VALUE load_path = vm->load_path;
VALUE expanded_load_path = vm->expanded_load_path;
VALUE ary;
long i;
ary = rb_ary_tmp_new(RARRAY_LEN(load_path));
for (i = 0; i < RARRAY_LEN(load_path); ++i) {
VALUE path, as_str, expanded_path;
int is_string, non_cache;
char *as_cstr;
as_str = path = RARRAY_AREF(load_path, i);
is_string = RB_TYPE_P(path, T_STRING) ? 1 : 0;
non_cache = !is_string ? 1 : 0;
as_str = rb_get_path_check_to_string(path);
as_cstr = RSTRING_PTR(as_str);
if (!non_cache) {
if ((type == EXPAND_RELATIVE &&
rb_is_absolute_path(as_cstr)) ||
(type == EXPAND_HOME &&
(!as_cstr[0] || as_cstr[0] != '~')) ||
(type == EXPAND_NON_CACHE)) {
/* Use cached expanded path. */
rb_ary_push(ary, RARRAY_AREF(expanded_load_path, i));
continue;
}
}
if (!*has_relative && !rb_is_absolute_path(as_cstr))
*has_relative = 1;
if (!*has_non_cache && non_cache)
*has_non_cache = 1;
/* Freeze only string object. We expand other objects every time. */
if (is_string)
rb_str_freeze(path);
as_str = rb_get_path_check_convert(as_str);
expanded_path = rb_check_realpath(Qnil, as_str, NULL);
if (NIL_P(expanded_path)) expanded_path = as_str;
rb_ary_push(ary, rb_fstring(expanded_path));
}
rb_obj_freeze(ary);
vm->expanded_load_path = ary;
rb_ary_replace(vm->load_path_snapshot, vm->load_path);
}
static VALUE
get_expanded_load_path(rb_vm_t *vm)
{
const VALUE non_cache = Qtrue;
if (!rb_ary_shared_with_p(vm->load_path_snapshot, vm->load_path)) {
/* The load path was modified. Rebuild the expanded load path. */
int has_relative = 0, has_non_cache = 0;
rb_construct_expanded_load_path(vm, EXPAND_ALL, &has_relative, &has_non_cache);
if (has_relative) {
vm->load_path_check_cache = rb_dir_getwd_ospath();
}
else if (has_non_cache) {
/* Non string object. */
vm->load_path_check_cache = non_cache;
}
else {
vm->load_path_check_cache = 0;
}
}
else if (vm->load_path_check_cache == non_cache) {
int has_relative = 1, has_non_cache = 1;
/* Expand only non-cacheable objects. */
rb_construct_expanded_load_path(vm, EXPAND_NON_CACHE,
&has_relative, &has_non_cache);
}
else if (vm->load_path_check_cache) {
int has_relative = 1, has_non_cache = 1;
VALUE cwd = rb_dir_getwd_ospath();
if (!rb_str_equal(vm->load_path_check_cache, cwd)) {
/* Current working directory or filesystem encoding was changed.
Expand relative load path and non-cacheable objects again. */
vm->load_path_check_cache = cwd;
rb_construct_expanded_load_path(vm, EXPAND_RELATIVE,
&has_relative, &has_non_cache);
}
else {
/* Expand only tilde (User HOME) and non-cacheable objects. */
rb_construct_expanded_load_path(vm, EXPAND_HOME,
&has_relative, &has_non_cache);
}
}
return vm->expanded_load_path;
}
VALUE
rb_get_expanded_load_path(void)
{
return get_expanded_load_path(GET_VM());
}
static VALUE
load_path_getter(ID id, VALUE * p)
{
rb_vm_t *vm = (void *)p;
return vm->load_path;
}
static VALUE
get_loaded_features(rb_vm_t *vm)
{
return vm->loaded_features;
}
static VALUE
get_loaded_features_realpaths(rb_vm_t *vm)
{
return vm->loaded_features_realpaths;
}
static VALUE
get_loaded_features_realpath_map(rb_vm_t *vm)
{
return vm->loaded_features_realpath_map;
}
static VALUE
get_LOADED_FEATURES(ID _x, VALUE *_y)
{
return get_loaded_features(GET_VM());
}
static void
reset_loaded_features_snapshot(rb_vm_t *vm)
{
rb_ary_replace(vm->loaded_features_snapshot, vm->loaded_features);
}
static struct st_table *
get_loaded_features_index_raw(rb_vm_t *vm)
{
return vm->loaded_features_index;
}
static st_table *
get_loading_table(rb_vm_t *vm)
{
return vm->loading_table;
}
static st_data_t
feature_key(const char *str, size_t len)
{
return st_hash(str, len, 0xfea7009e);
}
static bool
is_rbext_path(VALUE feature_path)
{
long len = RSTRING_LEN(feature_path);
long rbext_len = rb_strlen_lit(".rb");
if (len <= rbext_len) return false;
return IS_RBEXT(RSTRING_PTR(feature_path) + len - rbext_len);
}
static void
features_index_add_single(rb_vm_t *vm, const char* str, size_t len, VALUE offset, bool rb)
{
struct st_table *features_index;
VALUE this_feature_index = Qnil;
st_data_t short_feature_key;
st_data_t data;
Check_Type(offset, T_FIXNUM);
short_feature_key = feature_key(str, len);
features_index = get_loaded_features_index_raw(vm);
if (!st_lookup(features_index, short_feature_key, &data) ||
NIL_P(this_feature_index = (VALUE)data)) {
st_insert(features_index, short_feature_key, (st_data_t)offset);
}
else if (FIXNUM_P(this_feature_index)) {
VALUE loaded_features = get_loaded_features(vm);
VALUE this_feature_path = RARRAY_AREF(loaded_features, FIX2LONG(this_feature_index));
VALUE feature_indexes[2];
int top = (rb && !is_rbext_path(this_feature_path)) ? 1 : 0;
feature_indexes[top^0] = this_feature_index;
feature_indexes[top^1] = offset;
this_feature_index = (VALUE)xcalloc(1, sizeof(struct RArray));
RBASIC(this_feature_index)->flags = T_ARRAY; /* fake VALUE, do not mark/sweep */
rb_ary_cat(this_feature_index, feature_indexes, numberof(feature_indexes));
st_insert(features_index, short_feature_key, (st_data_t)this_feature_index);
}
else {
long pos = -1;
Check_Type(this_feature_index, T_ARRAY);
if (rb) {
VALUE loaded_features = get_loaded_features(vm);
for (long i = 0; i < RARRAY_LEN(this_feature_index); ++i) {
VALUE idx = RARRAY_AREF(this_feature_index, i);
VALUE this_feature_path = RARRAY_AREF(loaded_features, FIX2LONG(idx));
Check_Type(this_feature_path, T_STRING);
if (!is_rbext_path(this_feature_path)) {
/* as this_feature_index is a fake VALUE, `push` (which
* doesn't wb_unprotect like as rb_ary_splice) first,
* then rotate partially. */
pos = i;
break;
}
}
}
rb_ary_push(this_feature_index, offset);
if (pos >= 0) {
VALUE *ptr = (VALUE *)RARRAY_CONST_PTR_TRANSIENT(this_feature_index);
long len = RARRAY_LEN(this_feature_index);
MEMMOVE(ptr + pos, ptr + pos + 1, VALUE, len - pos - 1);
ptr[pos] = offset;
}
}
}
/* Add to the loaded-features index all the required entries for
`feature`, located at `offset` in $LOADED_FEATURES. We add an
index entry at each string `short_feature` for which
feature == "#{prefix}#{short_feature}#{ext}"
where `ext` is empty or matches %r{^\.[^./]*$}, and `prefix` is empty
or ends in '/'. This maintains the invariant that `rb_feature_p()`
relies on for its fast lookup.
*/
static void
features_index_add(rb_vm_t *vm, VALUE feature, VALUE offset)
{
const char *feature_str, *feature_end, *ext, *p;
bool rb = false;
feature_str = StringValuePtr(feature);
feature_end = feature_str + RSTRING_LEN(feature);
for (ext = feature_end; ext > feature_str; ext--)
if (*ext == '.' || *ext == '/')
break;
if (*ext != '.')
ext = NULL;
else
rb = IS_RBEXT(ext);
/* Now `ext` points to the only string matching %r{^\.[^./]*$} that is
at the end of `feature`, or is NULL if there is no such string. */
p = ext ? ext : feature_end;
while (1) {
p--;
while (p >= feature_str && *p != '/')
p--;
if (p < feature_str)
break;
/* Now *p == '/'. We reach this point for every '/' in `feature`. */
features_index_add_single(vm, p + 1, feature_end - p - 1, offset, false);
if (ext) {
features_index_add_single(vm, p + 1, ext - p - 1, offset, rb);
}
}
features_index_add_single(vm, feature_str, feature_end - feature_str, offset, false);
if (ext) {
features_index_add_single(vm, feature_str, ext - feature_str, offset, rb);
}
}
static int
loaded_features_index_clear_i(st_data_t key, st_data_t val, st_data_t arg)
{
VALUE obj = (VALUE)val;
if (!SPECIAL_CONST_P(obj)) {
rb_ary_free(obj);
ruby_sized_xfree((void *)obj, sizeof(struct RArray));
}
return ST_DELETE;
}
static st_table *
get_loaded_features_index(rb_vm_t *vm)
{
VALUE features;
int i;
if (!rb_ary_shared_with_p(vm->loaded_features_snapshot, vm->loaded_features)) {
/* The sharing was broken; something (other than us in rb_provide_feature())
modified loaded_features. Rebuild the index. */
st_foreach(vm->loaded_features_index, loaded_features_index_clear_i, 0);
VALUE realpaths = vm->loaded_features_realpaths;
VALUE realpath_map = vm->loaded_features_realpath_map;
VALUE previous_realpath_map = rb_hash_dup(realpath_map);
rb_hash_clear(realpaths);
rb_hash_clear(realpath_map);
features = vm->loaded_features;
for (i = 0; i < RARRAY_LEN(features); i++) {
VALUE entry, as_str;
as_str = entry = rb_ary_entry(features, i);
StringValue(as_str);
as_str = rb_fstring(as_str);
if (as_str != entry)
rb_ary_store(features, i, as_str);
features_index_add(vm, as_str, INT2FIX(i));
}
reset_loaded_features_snapshot(vm);
features = rb_ary_dup(vm->loaded_features_snapshot);
long j = RARRAY_LEN(features);
for (i = 0; i < j; i++) {
VALUE as_str = rb_ary_entry(features, i);
VALUE realpath = rb_hash_aref(previous_realpath_map, as_str);
if (NIL_P(realpath)) {
realpath = rb_check_realpath(Qnil, as_str, NULL);
if (NIL_P(realpath)) realpath = as_str;
realpath = rb_fstring(realpath);
}
rb_hash_aset(realpaths, realpath, Qtrue);
rb_hash_aset(realpath_map, as_str, realpath);
}
}
return vm->loaded_features_index;
}
/* This searches `load_path` for a value such that
name == "#{load_path[i]}/#{feature}"
if `feature` is a suffix of `name`, or otherwise
name == "#{load_path[i]}/#{feature}#{ext}"
for an acceptable string `ext`. It returns
`load_path[i].to_str` if found, else 0.
If type is 's', then `ext` is acceptable only if IS_DLEXT(ext);
if 'r', then only if IS_RBEXT(ext); otherwise `ext` may be absent
or have any value matching `%r{^\.[^./]*$}`.
*/
static VALUE
loaded_feature_path(const char *name, long vlen, const char *feature, long len,
int type, VALUE load_path)
{
long i;
long plen;
const char *e;
if (vlen < len+1) return 0;
if (strchr(feature, '.') && !strncmp(name+(vlen-len), feature, len)) {
plen = vlen - len;
}
else {
for (e = name + vlen; name != e && *e != '.' && *e != '/'; --e);
if (*e != '.' ||
e-name < len ||
strncmp(e-len, feature, len))
return 0;
plen = e - name - len;
}
if (plen > 0 && name[plen-1] != '/') {
return 0;
}
if (type == 's' ? !IS_DLEXT(&name[plen+len]) :
type == 'r' ? !IS_RBEXT(&name[plen+len]) :
0) {
return 0;
}
/* Now name == "#{prefix}/#{feature}#{ext}" where ext is acceptable
(possibly empty) and prefix is some string of length plen. */
if (plen > 0) --plen; /* exclude '.' */
for (i = 0; i < RARRAY_LEN(load_path); ++i) {
VALUE p = RARRAY_AREF(load_path, i);
const char *s = StringValuePtr(p);
long n = RSTRING_LEN(p);
if (n != plen) continue;
if (n && strncmp(name, s, n)) continue;
return p;
}
return 0;
}
struct loaded_feature_searching {
const char *name;
long len;
int type;
VALUE load_path;
const char *result;
};
static int
loaded_feature_path_i(st_data_t v, st_data_t b, st_data_t f)
{
const char *s = (const char *)v;
struct loaded_feature_searching *fp = (struct loaded_feature_searching *)f;
VALUE p = loaded_feature_path(s, strlen(s), fp->name, fp->len,
fp->type, fp->load_path);
if (!p) return ST_CONTINUE;
fp->result = s;
return ST_STOP;
}
static int
rb_feature_p(rb_vm_t *vm, const char *feature, const char *ext, int rb, int expanded, const char **fn)
{
VALUE features, this_feature_index = Qnil, v, p, load_path = 0;
const char *f, *e;
long i, len, elen, n;
st_table *loading_tbl, *features_index;
st_data_t data;
st_data_t key;
int type;
if (fn) *fn = 0;
if (ext) {
elen = strlen(ext);
len = strlen(feature) - elen;
type = rb ? 'r' : 's';
}
else {
len = strlen(feature);
elen = 0;
type = 0;
}
features = get_loaded_features(vm);
features_index = get_loaded_features_index(vm);
key = feature_key(feature, strlen(feature));
/* We search `features` for an entry such that either
"#{features[i]}" == "#{load_path[j]}/#{feature}#{e}"
for some j, or
"#{features[i]}" == "#{feature}#{e}"
Here `e` is an "allowed" extension -- either empty or one
of the extensions accepted by IS_RBEXT, IS_SOEXT, or
IS_DLEXT. Further, if `ext && rb` then `IS_RBEXT(e)`,
and if `ext && !rb` then `IS_SOEXT(e) || IS_DLEXT(e)`.
If `expanded`, then only the latter form (without load_path[j])
is accepted. Otherwise either form is accepted, *unless* `ext`
is false and an otherwise-matching entry of the first form is
preceded by an entry of the form
"#{features[i2]}" == "#{load_path[j2]}/#{feature}#{e2}"
where `e2` matches %r{^\.[^./]*$} but is not an allowed extension.
After a "distractor" entry of this form, only entries of the
form "#{feature}#{e}" are accepted.
In `rb_provide_feature()` and `get_loaded_features_index()` we
maintain an invariant that the array `this_feature_index` will
point to every entry in `features` which has the form
"#{prefix}#{feature}#{e}"
where `e` is empty or matches %r{^\.[^./]*$}, and `prefix` is empty
or ends in '/'. This includes both match forms above, as well
as any distractors, so we may ignore all other entries in `features`.
*/
if (st_lookup(features_index, key, &data) && !NIL_P(this_feature_index = (VALUE)data)) {
for (i = 0; ; i++) {
VALUE entry;
long index;
if (RB_TYPE_P(this_feature_index, T_ARRAY)) {
if (i >= RARRAY_LEN(this_feature_index)) break;
entry = RARRAY_AREF(this_feature_index, i);
}
else {
if (i > 0) break;
entry = this_feature_index;
}
index = FIX2LONG(entry);
v = RARRAY_AREF(features, index);
f = StringValuePtr(v);
if ((n = RSTRING_LEN(v)) < len) continue;
if (strncmp(f, feature, len) != 0) {
if (expanded) continue;
if (!load_path) load_path = get_expanded_load_path(vm);
if (!(p = loaded_feature_path(f, n, feature, len, type, load_path)))
continue;
expanded = 1;
f += RSTRING_LEN(p) + 1;
}
if (!*(e = f + len)) {
if (ext) continue;
return 'u';
}
if (*e != '.') continue;
if ((!rb || !ext) && (IS_SOEXT(e) || IS_DLEXT(e))) {
return 's';
}
if ((rb || !ext) && (IS_RBEXT(e))) {
return 'r';
}
}
}
loading_tbl = get_loading_table(vm);
f = 0;
if (!expanded) {
struct loaded_feature_searching fs;
fs.name = feature;
fs.len = len;
fs.type = type;
fs.load_path = load_path ? load_path : get_expanded_load_path(vm);
fs.result = 0;
st_foreach(loading_tbl, loaded_feature_path_i, (st_data_t)&fs);
if ((f = fs.result) != 0) {
if (fn) *fn = f;
goto loading;
}
}
if (st_get_key(loading_tbl, (st_data_t)feature, &data)) {
if (fn) *fn = (const char*)data;
goto loading;
}
else {
VALUE bufstr;
char *buf;
static const char so_ext[][4] = {
".so", ".o",
};
if (ext && *ext) return 0;
bufstr = rb_str_tmp_new(len + DLEXT_MAXLEN);
buf = RSTRING_PTR(bufstr);
MEMCPY(buf, feature, char, len);
for (i = 0; (e = loadable_ext[i]) != 0; i++) {
strlcpy(buf + len, e, DLEXT_MAXLEN + 1);
if (st_get_key(loading_tbl, (st_data_t)buf, &data)) {
rb_str_resize(bufstr, 0);
if (fn) *fn = (const char*)data;
return i ? 's' : 'r';
}
}
for (i = 0; i < numberof(so_ext); i++) {
strlcpy(buf + len, so_ext[i], DLEXT_MAXLEN + 1);
if (st_get_key(loading_tbl, (st_data_t)buf, &data)) {
rb_str_resize(bufstr, 0);
if (fn) *fn = (const char*)data;
return 's';
}
}
rb_str_resize(bufstr, 0);
}
return 0;
loading:
if (!ext) return 'u';
return !IS_RBEXT(ext) ? 's' : 'r';
}
int
rb_provided(const char *feature)
{
return rb_feature_provided(feature, 0);
}
static int
feature_provided(rb_vm_t *vm, const char *feature, const char **loading)
{
const char *ext = strrchr(feature, '.');
VALUE fullpath = 0;
if (*feature == '.' &&
(feature[1] == '/' || strncmp(feature+1, "./", 2) == 0)) {
fullpath = rb_file_expand_path_fast(rb_get_path(rb_str_new2(feature)), Qnil);
feature = RSTRING_PTR(fullpath);
}
if (ext && !strchr(ext, '/')) {
if (IS_RBEXT(ext)) {
if (rb_feature_p(vm, feature, ext, TRUE, FALSE, loading)) return TRUE;
return FALSE;
}
else if (IS_SOEXT(ext) || IS_DLEXT(ext)) {
if (rb_feature_p(vm, feature, ext, FALSE, FALSE, loading)) return TRUE;
return FALSE;
}
}
if (rb_feature_p(vm, feature, 0, TRUE, FALSE, loading))
return TRUE;
RB_GC_GUARD(fullpath);
return FALSE;
}
int
rb_feature_provided(const char *feature, const char **loading)
{
return feature_provided(GET_VM(), feature, loading);
}
static void
rb_provide_feature(rb_vm_t *vm, VALUE feature)
{
VALUE features;
features = get_loaded_features(vm);
if (OBJ_FROZEN(features)) {
rb_raise(rb_eRuntimeError,
"$LOADED_FEATURES is frozen; cannot append feature");
}
rb_str_freeze(feature);
get_loaded_features_index(vm);
// If loaded_features and loaded_features_snapshot share the same backing
// array, pushing into it would cause the whole array to be copied.
// To avoid this we first clear loaded_features_snapshot.
rb_ary_clear(vm->loaded_features_snapshot);
rb_ary_push(features, rb_fstring(feature));
features_index_add(vm, feature, INT2FIX(RARRAY_LEN(features)-1));
reset_loaded_features_snapshot(vm);
}
void
rb_provide(const char *feature)
{
rb_provide_feature(GET_VM(), rb_fstring_cstr(feature));
}
NORETURN(static void load_failed(VALUE));
static inline void
load_iseq_eval(rb_execution_context_t *ec, VALUE fname)
{
const rb_iseq_t *iseq = rb_iseq_load_iseq(fname);
if (!iseq) {
rb_ast_t *ast;
VALUE parser = rb_parser_new();
rb_parser_set_context(parser, NULL, FALSE);
ast = (rb_ast_t *)rb_parser_load_file(parser, fname);
iseq = rb_iseq_new_top(&ast->body, rb_fstring_lit("<top (required)>"),
fname, rb_realpath_internal(Qnil, fname, 1), NULL);
rb_ast_dispose(ast);
}
rb_exec_event_hook_script_compiled(ec, iseq, Qnil);
rb_iseq_eval(iseq);
}
static inline enum ruby_tag_type
load_wrapping(rb_execution_context_t *ec, VALUE fname, VALUE load_wrapper)
{
enum ruby_tag_type state;
rb_thread_t *th = rb_ec_thread_ptr(ec);
volatile VALUE wrapper = th->top_wrapper;
volatile VALUE self = th->top_self;
#if !defined __GNUC__
rb_thread_t *volatile th0 = th;
#endif
ec->errinfo = Qnil; /* ensure */
/* load in module as toplevel */
th->top_self = rb_obj_clone(rb_vm_top_self());
th->top_wrapper = load_wrapper;
rb_extend_object(th->top_self, th->top_wrapper);
EC_PUSH_TAG(ec);
state = EC_EXEC_TAG();
if (state == TAG_NONE) {
load_iseq_eval(ec, fname);
}
EC_POP_TAG();
#if !defined __GNUC__
th = th0;
fname = RB_GC_GUARD(fname);
#endif
th->top_self = self;
th->top_wrapper = wrapper;
return state;
}
static inline void
raise_load_if_failed(rb_execution_context_t *ec, enum ruby_tag_type state)
{
if (state) {
rb_vm_jump_tag_but_local_jump(state);
}
if (!NIL_P(ec->errinfo)) {
rb_exc_raise(ec->errinfo);
}
}
static void
rb_load_internal(VALUE fname, VALUE wrap)
{
rb_execution_context_t *ec = GET_EC();
enum ruby_tag_type state = TAG_NONE;
if (RTEST(wrap)) {
if (!RB_TYPE_P(wrap, T_MODULE)) {
wrap = rb_module_new();
}
state = load_wrapping(ec, fname, wrap);
}
else {
load_iseq_eval(ec, fname);
}
raise_load_if_failed(ec, state);
}
void
rb_load(VALUE fname, int wrap)
{
VALUE tmp = rb_find_file(FilePathValue(fname));
if (!tmp) load_failed(fname);
rb_load_internal(tmp, RBOOL(wrap));
}
void
rb_load_protect(VALUE fname, int wrap, int *pstate)
{
enum ruby_tag_type state;
EC_PUSH_TAG(GET_EC());
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
rb_load(fname, wrap);
}
EC_POP_TAG();
if (state != TAG_NONE) *pstate = state;
}
/*
* call-seq:
* load(filename, wrap=false) -> true
*
* Loads and executes the Ruby program in the file _filename_.
*
* If the filename is an absolute path (e.g. starts with '/'), the file
* will be loaded directly using the absolute path.
*
* If the filename is an explicit relative path (e.g. starts with './' or
* '../'), the file will be loaded using the relative path from the current
* directory.
*
* Otherwise, the file will be searched for in the library
* directories listed in <code>$LOAD_PATH</code> (<code>$:</code>).
* If the file is found in a directory, it will attempt to load the file
* relative to that directory. If the file is not found in any of the
* directories in <code>$LOAD_PATH</code>, the file will be loaded using
* the relative path from the current directory.
*
* If the file doesn't exist when there is an attempt to load it, a
* LoadError will be raised.
*
* If the optional _wrap_ parameter is +true+, the loaded script will
* be executed under an anonymous module, protecting the calling
* program's global namespace. If the optional _wrap_ parameter is a
* module, the loaded script will be executed under the given module.
* In no circumstance will any local variables in the loaded file be
* propagated to the loading environment.
*/
static VALUE
rb_f_load(int argc, VALUE *argv, VALUE _)
{
VALUE fname, wrap, path, orig_fname;
rb_scan_args(argc, argv, "11", &fname, &wrap);
orig_fname = rb_get_path_check_to_string(fname);
fname = rb_str_encode_ospath(orig_fname);
RUBY_DTRACE_HOOK(LOAD_ENTRY, RSTRING_PTR(orig_fname));
path = rb_find_file(fname);
if (!path) {
if (!rb_file_load_ok(RSTRING_PTR(fname)))
load_failed(orig_fname);
path = fname;
}
rb_load_internal(path, wrap);
RUBY_DTRACE_HOOK(LOAD_RETURN, RSTRING_PTR(orig_fname));
return Qtrue;
}
static char *
load_lock(rb_vm_t *vm, const char *ftptr, bool warn)
{
st_data_t data;
st_table *loading_tbl = get_loading_table(vm);
if (!st_lookup(loading_tbl, (st_data_t)ftptr, &data)) {
/* partial state */
ftptr = ruby_strdup(ftptr);
data = (st_data_t)rb_thread_shield_new();
st_insert(loading_tbl, (st_data_t)ftptr, data);
return (char *)ftptr;
}
if (warn && rb_thread_shield_owned((VALUE)data)) {
VALUE warning = rb_warning_string("loading in progress, circular require considered harmful - %s", ftptr);
rb_backtrace_each(rb_str_append, warning);
rb_warning("%"PRIsVALUE, warning);
}
switch (rb_thread_shield_wait((VALUE)data)) {
case Qfalse:
case Qnil:
return 0;
}
return (char *)ftptr;
}
static int
release_thread_shield(st_data_t *key, st_data_t *value, st_data_t done, int existing)
{
VALUE thread_shield = (VALUE)*value;
if (!existing) return ST_STOP;
if (done) {
rb_thread_shield_destroy(thread_shield);
/* Delete the entry even if there are waiting threads, because they
* won't load the file and won't delete the entry. */
}
else if (rb_thread_shield_release(thread_shield)) {
/* still in-use */
return ST_CONTINUE;
}
xfree((char *)*key);
return ST_DELETE;
}
static void
load_unlock(rb_vm_t *vm, const char *ftptr, int done)
{
if (ftptr) {
st_data_t key = (st_data_t)ftptr;
st_table *loading_tbl = get_loading_table(vm);
st_update(loading_tbl, key, release_thread_shield, done);
}
}
static VALUE rb_require_string_internal(VALUE fname);
/*
* call-seq:
* require(name) -> true or false
*
* Loads the given +name+, returning +true+ if successful and +false+ if the
* feature is already loaded.
*
* If the filename neither resolves to an absolute path nor starts with
* './' or '../', the file will be searched for in the library
* directories listed in <code>$LOAD_PATH</code> (<code>$:</code>).
* If the filename starts with './' or '../', resolution is based on Dir.pwd.
*
* If the filename has the extension ".rb", it is loaded as a source file; if
* the extension is ".so", ".o", or ".dll", or the default shared library
* extension on the current platform, Ruby loads the shared library as a
* Ruby extension. Otherwise, Ruby tries adding ".rb", ".so", and so on
* to the name until found. If the file named cannot be found, a LoadError
* will be raised.
*
* For Ruby extensions the filename given may use any shared library
* extension. For example, on Linux the socket extension is "socket.so" and
* <code>require 'socket.dll'</code> will load the socket extension.
*
* The absolute path of the loaded file is added to
* <code>$LOADED_FEATURES</code> (<code>$"</code>). A file will not be
* loaded again if its path already appears in <code>$"</code>. For example,
* <code>require 'a'; require './a'</code> will not load <code>a.rb</code>
* again.
*
* require "my-library.rb"
* require "db-driver"
*
* Any constants or globals within the loaded source file will be available
* in the calling program's global namespace. However, local variables will
* not be propagated to the loading environment.
*
*/
VALUE
rb_f_require(VALUE obj, VALUE fname)
{
return rb_require_string(fname);
}
/*
* call-seq:
* require_relative(string) -> true or false
*
* Ruby tries to load the library named _string_ relative to the requiring
* file's path. If the file's path cannot be determined a LoadError is raised.
* If a file is loaded +true+ is returned and false otherwise.
*/
VALUE
rb_f_require_relative(VALUE obj, VALUE fname)
{
VALUE base = rb_current_realfilepath();
if (NIL_P(base)) {
rb_loaderror("cannot infer basepath");
}
base = rb_file_dirname(base);
return rb_require_string_internal(rb_file_absolute_path(fname, base));
}
typedef int (*feature_func)(rb_vm_t *vm, const char *feature, const char *ext, int rb, int expanded, const char **fn);
static int
search_required(rb_vm_t *vm, VALUE fname, volatile VALUE *path, feature_func rb_feature_p)
{
VALUE tmp;
char *ext, *ftptr;
int type, ft = 0;
const char *loading;
*path = 0;
ext = strrchr(ftptr = RSTRING_PTR(fname), '.');
if (ext && !strchr(ext, '/')) {
if (IS_RBEXT(ext)) {
if (rb_feature_p(vm, ftptr, ext, TRUE, FALSE, &loading)) {
if (loading) *path = rb_filesystem_str_new_cstr(loading);
return 'r';
}
if ((tmp = rb_find_file(fname)) != 0) {
ext = strrchr(ftptr = RSTRING_PTR(tmp), '.');
if (!rb_feature_p(vm, ftptr, ext, TRUE, TRUE, &loading) || loading)
*path = tmp;
return 'r';
}
return 0;
}
else if (IS_SOEXT(ext)) {
if (rb_feature_p(vm, ftptr, ext, FALSE, FALSE, &loading)) {
if (loading) *path = rb_filesystem_str_new_cstr(loading);
return 's';
}
tmp = rb_str_subseq(fname, 0, ext - RSTRING_PTR(fname));
rb_str_cat2(tmp, DLEXT);
OBJ_FREEZE(tmp);
if ((tmp = rb_find_file(tmp)) != 0) {
ext = strrchr(ftptr = RSTRING_PTR(tmp), '.');
if (!rb_feature_p(vm, ftptr, ext, FALSE, TRUE, &loading) || loading)
*path = tmp;
return 's';
}
}
else if (IS_DLEXT(ext)) {
if (rb_feature_p(vm, ftptr, ext, FALSE, FALSE, &loading)) {
if (loading) *path = rb_filesystem_str_new_cstr(loading);
return 's';
}
if ((tmp = rb_find_file(fname)) != 0) {
ext = strrchr(ftptr = RSTRING_PTR(tmp), '.');
if (!rb_feature_p(vm, ftptr, ext, FALSE, TRUE, &loading) || loading)
*path = tmp;
return 's';
}
}
}
else if ((ft = rb_feature_p(vm, ftptr, 0, FALSE, FALSE, &loading)) == 'r') {
if (loading) *path = rb_filesystem_str_new_cstr(loading);
return 'r';
}
tmp = fname;
type = rb_find_file_ext(&tmp, ft == 's' ? ruby_ext : loadable_ext);
#if EXTSTATIC
if (!ft && type != 1) { // not already a feature and not found as a dynamic library
VALUE lookup_name = tmp;
// Append ".so" if not already present so for example "etc" can find "etc.so".