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ruby--ruby/vm_eval.c
zzak 60272f90fd * vm_eval.c: [DOC] [Bug #9551] Improve clarity of Kernel::catch 
documentation, patch by Jesse Sielaff.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46985 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2014-07-27 21:35:47 +00:00

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/**********************************************************************
vm_eval.c -
$Author$
created at: Sat May 24 16:02:32 JST 2008
Copyright (C) 1993-2007 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
struct local_var_list {
VALUE tbl;
};
static inline VALUE method_missing(VALUE obj, ID id, int argc, const VALUE *argv, int call_status);
static inline VALUE vm_yield_with_cref(rb_thread_t *th, int argc, const VALUE *argv, const NODE *cref);
static inline VALUE vm_yield(rb_thread_t *th, int argc, const VALUE *argv);
static inline VALUE vm_yield_with_block(rb_thread_t *th, int argc, const VALUE *argv, const rb_block_t *blockargptr);
static NODE *vm_cref_push(rb_thread_t *th, VALUE klass, int noex, rb_block_t *blockptr);
static VALUE vm_exec(rb_thread_t *th);
static void vm_set_eval_stack(rb_thread_t * th, VALUE iseqval, const NODE *cref, rb_block_t *base_block);
static int vm_collect_local_variables_in_heap(rb_thread_t *th, const VALUE *dfp, const struct local_var_list *vars);
/* vm_backtrace.c */
VALUE rb_vm_backtrace_str_ary(rb_thread_t *th, int lev, int n);
typedef enum call_type {
CALL_PUBLIC,
CALL_FCALL,
CALL_VCALL,
CALL_TYPE_MAX
} call_type;
static VALUE send_internal(int argc, const VALUE *argv, VALUE recv, call_type scope);
static VALUE vm_call0_body(rb_thread_t* th, rb_call_info_t *ci, const VALUE *argv);
static VALUE
vm_call0(rb_thread_t* th, VALUE recv, ID id, int argc, const VALUE *argv,
const rb_method_entry_t *me, VALUE defined_class)
{
rb_call_info_t ci_entry, *ci = &ci_entry;
ci->flag = 0;
ci->mid = id;
ci->recv = recv;
ci->defined_class = defined_class;
ci->argc = argc;
ci->me = me;
return vm_call0_body(th, ci, argv);
}
#if OPT_CALL_CFUNC_WITHOUT_FRAME
static VALUE
vm_call0_cfunc(rb_thread_t* th, rb_call_info_t *ci, const VALUE *argv)
{
VALUE val;
RUBY_DTRACE_CMETHOD_ENTRY_HOOK(th, ci->defined_class, ci->mid);
EXEC_EVENT_HOOK(th, RUBY_EVENT_C_CALL, ci->recv, ci->mid, ci->defined_class, Qnil);
{
rb_control_frame_t *reg_cfp = th->cfp;
const rb_method_entry_t *me = ci->me;
const rb_method_cfunc_t *cfunc = &me->def->body.cfunc;
int len = cfunc->argc;
if (len >= 0) rb_check_arity(ci->argc, len, len);
th->passed_ci = ci;
ci->aux.inc_sp = 0;
VM_PROFILE_UP(2);
val = (*cfunc->invoker)(cfunc->func, ci, argv);
if (reg_cfp == th->cfp) {
if (UNLIKELY(th->passed_ci != ci)) {
rb_bug("vm_call0_cfunc: passed_ci error (ci: %p, passed_ci: %p)", ci, th->passed_ci);
}
th->passed_ci = 0;
}
else {
if (reg_cfp != th->cfp + 1) {
rb_bug("vm_call0_cfunc: cfp consistency error");
}
VM_PROFILE_UP(3);
vm_pop_frame(th);
}
}
EXEC_EVENT_HOOK(th, RUBY_EVENT_C_RETURN, ci->recv, ci->mid, ci->defined_class, val);
RUBY_DTRACE_CMETHOD_RETURN_HOOK(th, ci->defined_class, ci->mid);
return val;
}
#else
static VALUE
vm_call0_cfunc_with_frame(rb_thread_t* th, rb_call_info_t *ci, const VALUE *argv)
{
VALUE val;
const rb_method_entry_t *me = ci->me;
const rb_method_cfunc_t *cfunc = &me->def->body.cfunc;
int len = cfunc->argc;
VALUE recv = ci->recv;
VALUE defined_class = ci->defined_class;
int argc = ci->argc;
ID mid = ci->mid;
rb_block_t *blockptr = ci->blockptr;
RUBY_DTRACE_CMETHOD_ENTRY_HOOK(th, defined_class, mid);
EXEC_EVENT_HOOK(th, RUBY_EVENT_C_CALL, recv, mid, defined_class, Qnil);
{
rb_control_frame_t *reg_cfp = th->cfp;
vm_push_frame(th, 0, VM_FRAME_MAGIC_CFUNC, recv, defined_class,
VM_ENVVAL_BLOCK_PTR(blockptr), 0, reg_cfp->sp, 1, me, 0);
if (len >= 0) rb_check_arity(argc, len, len);
VM_PROFILE_UP(2);
val = (*cfunc->invoker)(cfunc->func, recv, argc, argv);
if (UNLIKELY(reg_cfp != th->cfp + 1)) {
rb_bug("vm_call0_cfunc_with_frame: cfp consistency error");
}
VM_PROFILE_UP(3);
vm_pop_frame(th);
}
EXEC_EVENT_HOOK(th, RUBY_EVENT_C_RETURN, recv, mid, defined_class, val);
RUBY_DTRACE_CMETHOD_RETURN_HOOK(th, defined_class, mid);
return val;
}
static VALUE
vm_call0_cfunc(rb_thread_t* th, rb_call_info_t *ci, const VALUE *argv)
{
return vm_call0_cfunc_with_frame(th, ci, argv);
}
#endif
/* `ci' should point temporal value (on stack value) */
static VALUE
vm_call0_body(rb_thread_t* th, rb_call_info_t *ci, const VALUE *argv)
{
VALUE ret;
if (!ci->me->def) return Qnil;
if (th->passed_block) {
ci->blockptr = (rb_block_t *)th->passed_block;
th->passed_block = 0;
}
else {
ci->blockptr = 0;
}
again:
switch (ci->me->def->type) {
case VM_METHOD_TYPE_ISEQ:
{
rb_control_frame_t *reg_cfp = th->cfp;
int i;
CHECK_VM_STACK_OVERFLOW(reg_cfp, ci->argc + 1);
*reg_cfp->sp++ = ci->recv;
for (i = 0; i < ci->argc; i++) {
*reg_cfp->sp++ = argv[i];
}
vm_call_iseq_setup(th, reg_cfp, ci);
th->cfp->flag |= VM_FRAME_FLAG_FINISH;
return vm_exec(th); /* CHECK_INTS in this function */
}
case VM_METHOD_TYPE_NOTIMPLEMENTED:
case VM_METHOD_TYPE_CFUNC:
ret = vm_call0_cfunc(th, ci, argv);
goto success;
case VM_METHOD_TYPE_ATTRSET:
rb_check_arity(ci->argc, 1, 1);
ret = rb_ivar_set(ci->recv, ci->me->def->body.attr.id, argv[0]);
goto success;
case VM_METHOD_TYPE_IVAR:
rb_check_arity(ci->argc, 0, 0);
ret = rb_attr_get(ci->recv, ci->me->def->body.attr.id);
goto success;
case VM_METHOD_TYPE_BMETHOD:
ret = vm_call_bmethod_body(th, ci, argv);
goto success;
case VM_METHOD_TYPE_ZSUPER:
case VM_METHOD_TYPE_REFINED:
{
const rb_method_type_t type = ci->me->def->type;
if (type == VM_METHOD_TYPE_REFINED &&
ci->me->def->body.orig_me) {
ci->me = ci->me->def->body.orig_me;
goto again;
}
ci->defined_class = RCLASS_SUPER(ci->defined_class);
if (!ci->defined_class || !(ci->me = rb_method_entry(ci->defined_class, ci->mid, &ci->defined_class))) {
int ex = type == VM_METHOD_TYPE_ZSUPER ? NOEX_SUPER : 0;
ret = method_missing(ci->recv, ci->mid, ci->argc, argv, ex);
goto success;
}
RUBY_VM_CHECK_INTS(th);
if (!ci->me->def) return Qnil;
goto again;
}
case VM_METHOD_TYPE_MISSING:
{
VALUE new_args = rb_ary_new4(ci->argc, argv);
rb_ary_unshift(new_args, ID2SYM(ci->mid));
th->passed_block = ci->blockptr;
ret = rb_funcall2(ci->recv, idMethodMissing, ci->argc+1,
RARRAY_CONST_PTR(new_args));
RB_GC_GUARD(new_args);
return ret;
}
case VM_METHOD_TYPE_OPTIMIZED:
switch (ci->me->def->body.optimize_type) {
case OPTIMIZED_METHOD_TYPE_SEND:
ret = send_internal(ci->argc, argv, ci->recv, CALL_FCALL);
goto success;
case OPTIMIZED_METHOD_TYPE_CALL:
{
rb_proc_t *proc;
GetProcPtr(ci->recv, proc);
ret = rb_vm_invoke_proc(th, proc, ci->argc, argv, ci->blockptr);
goto success;
}
default:
rb_bug("vm_call0: unsupported optimized method type (%d)", ci->me->def->body.optimize_type);
}
break;
case VM_METHOD_TYPE_UNDEF:
break;
}
rb_bug("vm_call0: unsupported method type (%d)", ci->me->def->type);
return Qundef;
success:
RUBY_VM_CHECK_INTS(th);
return ret;
}
VALUE
rb_vm_call(rb_thread_t *th, VALUE recv, VALUE id, int argc, const VALUE *argv,
const rb_method_entry_t *me, VALUE defined_class)
{
return vm_call0(th, recv, id, argc, argv, me, defined_class);
}
static inline VALUE
vm_call_super(rb_thread_t *th, int argc, const VALUE *argv)
{
VALUE recv = th->cfp->self;
VALUE klass;
ID id;
rb_method_entry_t *me;
rb_control_frame_t *cfp = th->cfp;
if (cfp->iseq || NIL_P(cfp->klass)) {
rb_bug("vm_call_super: should not be reached");
}
klass = RCLASS_SUPER(cfp->klass);
id = cfp->me->def->original_id;
me = rb_method_entry(klass, id, &klass);
if (!me) {
return method_missing(recv, id, argc, argv, NOEX_SUPER);
}
return vm_call0(th, recv, id, argc, argv, me, klass);
}
VALUE
rb_call_super(int argc, const VALUE *argv)
{
PASS_PASSED_BLOCK();
return vm_call_super(GET_THREAD(), argc, argv);
}
static inline void
stack_check(void)
{
rb_thread_t *th = GET_THREAD();
if (!rb_thread_raised_p(th, RAISED_STACKOVERFLOW) && ruby_stack_check()) {
rb_thread_raised_set(th, RAISED_STACKOVERFLOW);
rb_exc_raise(sysstack_error);
}
}
static inline rb_method_entry_t *
rb_search_method_entry(VALUE recv, ID mid, VALUE *defined_class_ptr);
static inline int rb_method_call_status(rb_thread_t *th, const rb_method_entry_t *me, call_type scope, VALUE self);
#define NOEX_OK NOEX_NOSUPER
/*!
* \internal
* calls the specified method.
*
* This function is called by functions in rb_call* family.
* \param recv receiver of the method
* \param mid an ID that represents the name of the method
* \param argc the number of method arguments
* \param argv a pointer to an array of method arguments
* \param scope
* \param self self in the caller. Qundef means no self is considered and
* protected methods cannot be called
*
* \note \a self is used in order to controlling access to protected methods.
*/
static inline VALUE
rb_call0(VALUE recv, ID mid, int argc, const VALUE *argv,
call_type scope, VALUE self)
{
VALUE defined_class;
rb_method_entry_t *me =
rb_search_method_entry(recv, mid, &defined_class);
rb_thread_t *th = GET_THREAD();
int call_status = rb_method_call_status(th, me, scope, self);
if (call_status != NOEX_OK) {
return method_missing(recv, mid, argc, argv, call_status);
}
stack_check();
return vm_call0(th, recv, mid, argc, argv, me, defined_class);
}
struct rescue_funcall_args {
VALUE recv;
VALUE sym;
int argc;
const VALUE *argv;
};
static VALUE
check_funcall_exec(struct rescue_funcall_args *args)
{
VALUE new_args = rb_ary_new4(args->argc, args->argv);
VALUE ret;
rb_ary_unshift(new_args, args->sym);
ret = rb_funcall2(args->recv, idMethodMissing,
args->argc+1, RARRAY_CONST_PTR(new_args));
RB_GC_GUARD(new_args);
return ret;
}
static VALUE
check_funcall_failed(struct rescue_funcall_args *args, VALUE e)
{
if (rb_respond_to(args->recv, SYM2ID(args->sym))) {
rb_exc_raise(e);
}
return Qundef;
}
static int
check_funcall_respond_to(rb_thread_t *th, VALUE klass, VALUE recv, ID mid)
{
VALUE defined_class;
const rb_method_entry_t *me = rb_method_entry(klass, idRespond_to, &defined_class);
if (me && !(me->flag & NOEX_BASIC)) {
const rb_block_t *passed_block = th->passed_block;
VALUE args[2], result;
int arity = rb_method_entry_arity(me);
if (arity > 2)
rb_raise(rb_eArgError, "respond_to? must accept 1 or 2 arguments (requires %d)", arity);
if (arity < 1) arity = 2;
args[0] = ID2SYM(mid);
args[1] = Qtrue;
result = vm_call0(th, recv, idRespond_to, arity, args, me, defined_class);
th->passed_block = passed_block;
if (!RTEST(result)) {
return FALSE;
}
}
return TRUE;
}
static int
check_funcall_callable(rb_thread_t *th, const rb_method_entry_t *me)
{
return rb_method_call_status(th, me, CALL_FCALL, th->cfp->self) == NOEX_OK;
}
static VALUE
check_funcall_missing(rb_thread_t *th, VALUE klass, VALUE recv, ID mid, int argc, const VALUE *argv)
{
if (rb_method_basic_definition_p(klass, idMethodMissing)) {
return Qundef;
}
else {
struct rescue_funcall_args args;
th->method_missing_reason = 0;
args.recv = recv;
args.sym = ID2SYM(mid);
args.argc = argc;
args.argv = argv;
return rb_rescue2(check_funcall_exec, (VALUE)&args,
check_funcall_failed, (VALUE)&args,
rb_eNoMethodError, (VALUE)0);
}
}
VALUE
rb_check_funcall(VALUE recv, ID mid, int argc, const VALUE *argv)
{
VALUE klass = CLASS_OF(recv);
const rb_method_entry_t *me;
rb_thread_t *th = GET_THREAD();
VALUE defined_class;
if (!check_funcall_respond_to(th, klass, recv, mid))
return Qundef;
me = rb_search_method_entry(recv, mid, &defined_class);
if (check_funcall_callable(th, me) != NOEX_OK) {
return check_funcall_missing(th, klass, recv, mid, argc, argv);
}
stack_check();
return vm_call0(th, recv, mid, argc, argv, me, defined_class);
}
VALUE
rb_check_funcall_with_hook(VALUE recv, ID mid, int argc, const VALUE *argv,
rb_check_funcall_hook *hook, VALUE arg)
{
VALUE klass = CLASS_OF(recv);
const rb_method_entry_t *me;
rb_thread_t *th = GET_THREAD();
VALUE defined_class;
if (!check_funcall_respond_to(th, klass, recv, mid))
return Qundef;
me = rb_search_method_entry(recv, mid, &defined_class);
if (check_funcall_callable(th, me) != NOEX_OK) {
(*hook)(FALSE, recv, mid, argc, argv, arg);
return check_funcall_missing(th, klass, recv, mid, argc, argv);
}
stack_check();
(*hook)(TRUE, recv, mid, argc, argv, arg);
return vm_call0(th, recv, mid, argc, argv, me, defined_class);
}
static const char *
rb_type_str(enum ruby_value_type type)
{
#define type_case(t) case t: return #t;
switch (type) {
type_case(T_NONE)
type_case(T_OBJECT)
type_case(T_CLASS)
type_case(T_MODULE)
type_case(T_FLOAT)
type_case(T_STRING)
type_case(T_REGEXP)
type_case(T_ARRAY)
type_case(T_HASH)
type_case(T_STRUCT)
type_case(T_BIGNUM)
type_case(T_FILE)
type_case(T_DATA)
type_case(T_MATCH)
type_case(T_COMPLEX)
type_case(T_RATIONAL)
type_case(T_NIL)
type_case(T_TRUE)
type_case(T_FALSE)
type_case(T_SYMBOL)
type_case(T_FIXNUM)
type_case(T_UNDEF)
type_case(T_NODE)
type_case(T_ICLASS)
type_case(T_ZOMBIE)
default: return NULL;
}
#undef type_case
}
static inline rb_method_entry_t *
rb_search_method_entry(VALUE recv, ID mid, VALUE *defined_class_ptr)
{
VALUE klass = CLASS_OF(recv);
if (!klass) {
VALUE flags;
if (SPECIAL_CONST_P(recv)) {
rb_raise(rb_eNotImpError,
"method `%"PRIsVALUE"' called on unexpected immediate object (%p)",
rb_id2str(mid), (void *)recv);
}
flags = RBASIC(recv)->flags;
if (flags == 0) {
rb_raise(rb_eNotImpError,
"method `%"PRIsVALUE"' called on terminated object"
" (%p flags=0x%"PRIxVALUE")",
rb_id2str(mid), (void *)recv, flags);
}
else {
int type = BUILTIN_TYPE(recv);
const char *typestr = rb_type_str(type);
if (typestr && T_OBJECT <= type && type < T_NIL)
rb_raise(rb_eNotImpError,
"method `%"PRIsVALUE"' called on hidden %s object"
" (%p flags=0x%"PRIxVALUE")",
rb_id2str(mid), typestr, (void *)recv, flags);
if (typestr)
rb_raise(rb_eNotImpError,
"method `%"PRIsVALUE"' called on unexpected %s object"
" (%p flags=0x%"PRIxVALUE")",
rb_id2str(mid), typestr, (void *)recv, flags);
else
rb_raise(rb_eNotImpError,
"method `%"PRIsVALUE"' called on broken T_???" "(0x%02x) object"
" (%p flags=0x%"PRIxVALUE")",
rb_id2str(mid), type, (void *)recv, flags);
}
}
return rb_method_entry(klass, mid, defined_class_ptr);
}
static inline int
rb_method_call_status(rb_thread_t *th, const rb_method_entry_t *me, call_type scope, VALUE self)
{
VALUE klass;
ID oid;
int noex;
if (UNDEFINED_METHOD_ENTRY_P(me)) {
return scope == CALL_VCALL ? NOEX_VCALL : 0;
}
klass = me->klass;
oid = me->def->original_id;
noex = me->flag;
if (oid != idMethodMissing) {
/* receiver specified form for private method */
if (UNLIKELY(noex)) {
if (((noex & NOEX_MASK) & NOEX_PRIVATE) && scope == CALL_PUBLIC) {
return NOEX_PRIVATE;
}
/* self must be kind of a specified form for protected method */
if (((noex & NOEX_MASK) & NOEX_PROTECTED) && scope == CALL_PUBLIC) {
VALUE defined_class = klass;
if (RB_TYPE_P(defined_class, T_ICLASS)) {
defined_class = RBASIC(defined_class)->klass;
}
if (self == Qundef || !rb_obj_is_kind_of(self, defined_class)) {
return NOEX_PROTECTED;
}
}
if (NOEX_SAFE(noex) > th->safe_level) {
rb_raise(rb_eSecurityError, "calling insecure method: %s",
rb_id2name(me->called_id));
}
}
}
return NOEX_OK;
}
/*!
* \internal
* calls the specified method.
*
* This function is called by functions in rb_call* family.
* \param recv receiver
* \param mid an ID that represents the name of the method
* \param argc the number of method arguments
* \param argv a pointer to an array of method arguments
* \param scope
*/
static inline VALUE
rb_call(VALUE recv, ID mid, int argc, const VALUE *argv, call_type scope)
{
rb_thread_t *th = GET_THREAD();
return rb_call0(recv, mid, argc, argv, scope, th->cfp->self);
}
NORETURN(static void raise_method_missing(rb_thread_t *th, int argc, const VALUE *argv,
VALUE obj, int call_status));
/*
* call-seq:
* obj.method_missing(symbol [, *args] ) -> result
*
* Invoked by Ruby when <i>obj</i> is sent a message it cannot handle.
* <i>symbol</i> is the symbol for the method called, and <i>args</i>
* are any arguments that were passed to it. By default, the interpreter
* raises an error when this method is called. However, it is possible
* to override the method to provide more dynamic behavior.
* If it is decided that a particular method should not be handled, then
* <i>super</i> should be called, so that ancestors can pick up the
* missing method.
* The example below creates
* a class <code>Roman</code>, which responds to methods with names
* consisting of roman numerals, returning the corresponding integer
* values.
*
* class Roman
* def roman_to_int(str)
* # ...
* end
* def method_missing(methId)
* str = methId.id2name
* roman_to_int(str)
* end
* end
*
* r = Roman.new
* r.iv #=> 4
* r.xxiii #=> 23
* r.mm #=> 2000
*/
static VALUE
rb_method_missing(int argc, const VALUE *argv, VALUE obj)
{
rb_thread_t *th = GET_THREAD();
raise_method_missing(th, argc, argv, obj, th->method_missing_reason);
UNREACHABLE;
}
#define NOEX_MISSING 0x80
static VALUE
make_no_method_exception(VALUE exc, const char *format, VALUE obj, int argc, const VALUE *argv)
{
int n = 0;
VALUE mesg;
VALUE args[3];
if (!format) {
format = "undefined method `%s' for %s";
}
mesg = rb_const_get(exc, rb_intern("message"));
if (rb_method_basic_definition_p(CLASS_OF(mesg), '!')) {
args[n++] = rb_name_err_mesg_new(mesg, rb_str_new2(format), obj, argv[0]);
}
else {
args[n++] = rb_funcall(mesg, '!', 3, rb_str_new2(format), obj, argv[0]);
}
args[n++] = argv[0];
if (exc == rb_eNoMethodError) {
args[n++] = rb_ary_new4(argc - 1, argv + 1);
}
return rb_class_new_instance(n, args, exc);
}
static void
raise_method_missing(rb_thread_t *th, int argc, const VALUE *argv, VALUE obj,
int last_call_status)
{
VALUE exc = rb_eNoMethodError;
const char *format = 0;
if (argc == 0 || !SYMBOL_P(argv[0])) {
rb_raise(rb_eArgError, "no id given");
}
stack_check();
if (last_call_status & NOEX_PRIVATE) {
format = "private method `%s' called for %s";
}
else if (last_call_status & NOEX_PROTECTED) {
format = "protected method `%s' called for %s";
}
else if (last_call_status & NOEX_VCALL) {
format = "undefined local variable or method `%s' for %s";
exc = rb_eNameError;
}
else if (last_call_status & NOEX_SUPER) {
format = "super: no superclass method `%s' for %s";
}
{
exc = make_no_method_exception(exc, format, obj, argc, argv);
if (!(last_call_status & NOEX_MISSING)) {
rb_vm_pop_cfunc_frame();
}
rb_exc_raise(exc);
}
}
static inline VALUE
method_missing(VALUE obj, ID id, int argc, const VALUE *argv, int call_status)
{
VALUE *nargv, result, work;
rb_thread_t *th = GET_THREAD();
const rb_block_t *blockptr = th->passed_block;
th->method_missing_reason = call_status;
th->passed_block = 0;
if (id == idMethodMissing) {
raise_method_missing(th, argc, argv, obj, call_status | NOEX_MISSING);
}
nargv = ALLOCV_N(VALUE, work, argc + 1);
nargv[0] = ID2SYM(id);
MEMCPY(nargv + 1, argv, VALUE, argc);
if (rb_method_basic_definition_p(CLASS_OF(obj) , idMethodMissing)) {
raise_method_missing(th, argc+1, nargv, obj, call_status | NOEX_MISSING);
}
th->passed_block = blockptr;
result = rb_funcall2(obj, idMethodMissing, argc + 1, nargv);
if (work) ALLOCV_END(work);
return result;
}
void
rb_raise_method_missing(rb_thread_t *th, int argc, const VALUE *argv,
VALUE obj, int call_status)
{
th->passed_block = 0;
raise_method_missing(th, argc, argv, obj, call_status | NOEX_MISSING);
}
/*!
* Calls a method
* \param recv receiver of the method
* \param mid an ID that represents the name of the method
* \param args an Array object which contains method arguments
*
* \pre \a args must refer an Array object.
*/
VALUE
rb_apply(VALUE recv, ID mid, VALUE args)
{
int argc;
VALUE *argv, ret;
argc = RARRAY_LENINT(args);
if (argc >= 0x100) {
args = rb_ary_subseq(args, 0, argc);
RBASIC_CLEAR_CLASS(args);
OBJ_FREEZE(args);
ret = rb_call(recv, mid, argc, RARRAY_CONST_PTR(args), CALL_FCALL);
RB_GC_GUARD(args);
return ret;
}
argv = ALLOCA_N(VALUE, argc);
MEMCPY(argv, RARRAY_CONST_PTR(args), VALUE, argc);
return rb_call(recv, mid, argc, argv, CALL_FCALL);
}
/*!
* Calls a method
* \param recv receiver of the method
* \param mid an ID that represents the name of the method
* \param n the number of arguments
* \param ... arbitrary number of method arguments
*
* \pre each of arguments after \a n must be a VALUE.
*/
VALUE
rb_funcall(VALUE recv, ID mid, int n, ...)
{
VALUE *argv;
va_list ar;
if (n > 0) {
long i;
va_init_list(ar, n);
argv = ALLOCA_N(VALUE, n);
for (i = 0; i < n; i++) {
argv[i] = va_arg(ar, VALUE);
}
va_end(ar);
}
else {
argv = 0;
}
return rb_call(recv, mid, n, argv, CALL_FCALL);
}
/*!
* Calls a method
* \param recv receiver of the method
* \param mid an ID that represents the name of the method
* \param argc the number of arguments
* \param argv pointer to an array of method arguments
*/
VALUE
rb_funcallv(VALUE recv, ID mid, int argc, const VALUE *argv)
{
return rb_call(recv, mid, argc, argv, CALL_FCALL);
}
/*!
* Calls a method.
*
* Same as rb_funcall2 but this function can call only public methods.
* \param recv receiver of the method
* \param mid an ID that represents the name of the method
* \param argc the number of arguments
* \param argv pointer to an array of method arguments
*/
VALUE
rb_funcallv_public(VALUE recv, ID mid, int argc, const VALUE *argv)
{
return rb_call(recv, mid, argc, argv, CALL_PUBLIC);
}
VALUE
rb_funcall_passing_block(VALUE recv, ID mid, int argc, const VALUE *argv)
{
PASS_PASSED_BLOCK_TH(GET_THREAD());
return rb_call(recv, mid, argc, argv, CALL_PUBLIC);
}
VALUE
rb_funcall_with_block(VALUE recv, ID mid, int argc, const VALUE *argv, VALUE pass_procval)
{
if (!NIL_P(pass_procval)) {
rb_thread_t *th = GET_THREAD();
rb_block_t *block = 0;
rb_proc_t *pass_proc;
GetProcPtr(pass_procval, pass_proc);
block = &pass_proc->block;
th->passed_block = block;
}
return rb_call(recv, mid, argc, argv, CALL_PUBLIC);
}
static VALUE
send_internal(int argc, const VALUE *argv, VALUE recv, call_type scope)
{
ID id;
VALUE vid;
VALUE self;
rb_thread_t *th = GET_THREAD();
if (scope == CALL_PUBLIC) {
self = Qundef;
}
else {
self = RUBY_VM_PREVIOUS_CONTROL_FRAME(th->cfp)->self;
}
if (argc == 0) {
rb_raise(rb_eArgError, "no method name given");
}
vid = *argv++; argc--;
id = rb_check_id(&vid);
if (!id) {
if (rb_method_basic_definition_p(CLASS_OF(recv), idMethodMissing)) {
VALUE exc = make_no_method_exception(rb_eNoMethodError, NULL,
recv, ++argc, --argv);
rb_exc_raise(exc);
}
id = rb_to_id(vid);
}
PASS_PASSED_BLOCK_TH(th);
return rb_call0(recv, id, argc, argv, scope, self);
}
/*
* call-seq:
* foo.send(symbol [, args...]) -> obj
* foo.__send__(symbol [, args...]) -> obj
* foo.send(string [, args...]) -> obj
* foo.__send__(string [, args...]) -> obj
*
* Invokes the method identified by _symbol_, passing it any
* arguments specified. You can use <code>__send__</code> if the name
* +send+ clashes with an existing method in _obj_.
* When the method is identified by a string, the string is converted
* to a symbol.
*
* class Klass
* def hello(*args)
* "Hello " + args.join(' ')
* end
* end
* k = Klass.new
* k.send :hello, "gentle", "readers" #=> "Hello gentle readers"
*/
VALUE
rb_f_send(int argc, VALUE *argv, VALUE recv)
{
return send_internal(argc, argv, recv, CALL_FCALL);
}
/*
* call-seq:
* obj.public_send(symbol [, args...]) -> obj
* obj.public_send(string [, args...]) -> obj
*
* Invokes the method identified by _symbol_, passing it any
* arguments specified. Unlike send, public_send calls public
* methods only.
* When the method is identified by a string, the string is converted
* to a symbol.
*
* 1.public_send(:puts, "hello") # causes NoMethodError
*/
VALUE
rb_f_public_send(int argc, VALUE *argv, VALUE recv)
{
return send_internal(argc, argv, recv, CALL_PUBLIC);
}
/* yield */
static inline VALUE
rb_yield_0(int argc, const VALUE * argv)
{
return vm_yield(GET_THREAD(), argc, argv);
}
VALUE
rb_yield(VALUE val)
{
if (val == Qundef) {
return rb_yield_0(0, 0);
}
else {
return rb_yield_0(1, &val);
}
}
VALUE
rb_yield_values(int n, ...)
{
if (n == 0) {
return rb_yield_0(0, 0);
}
else {
int i;
VALUE *argv;
va_list args;
argv = ALLOCA_N(VALUE, n);
va_init_list(args, n);
for (i=0; i<n; i++) {
argv[i] = va_arg(args, VALUE);
}
va_end(args);
return rb_yield_0(n, argv);
}
}
VALUE
rb_yield_values2(int argc, const VALUE *argv)
{
return rb_yield_0(argc, argv);
}
VALUE
rb_yield_splat(VALUE values)
{
VALUE tmp = rb_check_array_type(values);
volatile VALUE v;
if (NIL_P(tmp)) {
rb_raise(rb_eArgError, "not an array");
}
v = rb_yield_0(RARRAY_LENINT(tmp), RARRAY_CONST_PTR(tmp));
return v;
}
VALUE
rb_yield_block(VALUE val, VALUE arg, int argc, const VALUE *argv, VALUE blockarg)
{
const rb_block_t *blockptr = 0;
if (!NIL_P(blockarg)) {
rb_proc_t *blockproc;
GetProcPtr(blockarg, blockproc);
blockptr = &blockproc->block;
}
return vm_yield_with_block(GET_THREAD(), argc, argv, blockptr);
}
static VALUE
loop_i(void)
{
for (;;) {
rb_yield_0(0, 0);
}
return Qnil;
}
static VALUE
rb_f_loop_size(VALUE self, VALUE args, VALUE eobj)
{
return DBL2NUM(INFINITY);
}
/*
* call-seq:
* loop { block }
* loop -> an_enumerator
*
* Repeatedly executes the block.
*
* If no block is given, an enumerator is returned instead.
*
* loop do
* print "Input: "
* line = gets
* break if !line or line =~ /^qQ/
* # ...
* end
*
* StopIteration raised in the block breaks the loop.
*/
static VALUE
rb_f_loop(VALUE self)
{
RETURN_SIZED_ENUMERATOR(self, 0, 0, rb_f_loop_size);
rb_rescue2(loop_i, (VALUE)0, 0, 0, rb_eStopIteration, (VALUE)0);
return Qnil; /* dummy */
}
#if VMDEBUG
static const char *
vm_frametype_name(const rb_control_frame_t *cfp);
#endif
VALUE
rb_iterate(VALUE (* it_proc) (VALUE), VALUE data1,
VALUE (* bl_proc) (ANYARGS), VALUE data2)
{
int state;
volatile VALUE retval = Qnil;
NODE *node = NEW_IFUNC(bl_proc, data2);
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *volatile cfp = th->cfp;
node->nd_aid = rb_frame_this_func();
TH_PUSH_TAG(th);
state = TH_EXEC_TAG();
if (state == 0) {
VAR_INITIALIZED(th);
VAR_INITIALIZED(node);
iter_retry:
{
rb_block_t *blockptr;
if (bl_proc) {
blockptr = RUBY_VM_GET_BLOCK_PTR_IN_CFP(th->cfp);
blockptr->iseq = (void *)node;
blockptr->proc = 0;
}
else {
blockptr = VM_CF_BLOCK_PTR(th->cfp);
}
th->passed_block = blockptr;
}
retval = (*it_proc) (data1);
}
else {
VALUE err = th->errinfo;
if (state == TAG_BREAK) {
VALUE *escape_ep = GET_THROWOBJ_CATCH_POINT(err);
VALUE *cep = cfp->ep;
if (cep == escape_ep) {
state = 0;
th->state = 0;
th->errinfo = Qnil;
retval = GET_THROWOBJ_VAL(err);
rb_vm_rewind_cfp(th, cfp);
}
else{
/* SDR(); printf("%p, %p\n", cdfp, escape_dfp); */
}
}
else if (state == TAG_RETRY) {
VALUE *escape_ep = GET_THROWOBJ_CATCH_POINT(err);
VALUE *cep = cfp->ep;
if (cep == escape_ep) {
rb_vm_rewind_cfp(th, cfp);
state = 0;
th->state = 0;
th->errinfo = Qnil;
goto iter_retry;
}
}
}
TH_POP_TAG();
switch (state) {
case 0:
break;
default:
TH_JUMP_TAG(th, state);
}
return retval;
}
struct iter_method_arg {
VALUE obj;
ID mid;
int argc;
const VALUE *argv;
};
static VALUE
iterate_method(VALUE obj)
{
const struct iter_method_arg * arg =
(struct iter_method_arg *) obj;
return rb_call(arg->obj, arg->mid, arg->argc, arg->argv, CALL_FCALL);
}
VALUE
rb_block_call(VALUE obj, ID mid, int argc, const VALUE * argv,
VALUE (*bl_proc) (ANYARGS), VALUE data2)
{
struct iter_method_arg arg;
arg.obj = obj;
arg.mid = mid;
arg.argc = argc;
arg.argv = argv;
return rb_iterate(iterate_method, (VALUE)&arg, bl_proc, data2);
}
static VALUE
iterate_check_method(VALUE obj)
{
const struct iter_method_arg * arg =
(struct iter_method_arg *) obj;
return rb_check_funcall(arg->obj, arg->mid, arg->argc, arg->argv);
}
VALUE
rb_check_block_call(VALUE obj, ID mid, int argc, const VALUE *argv,
VALUE (*bl_proc) (ANYARGS), VALUE data2)
{
struct iter_method_arg arg;
arg.obj = obj;
arg.mid = mid;
arg.argc = argc;
arg.argv = argv;
return rb_iterate(iterate_check_method, (VALUE)&arg, bl_proc, data2);
}
VALUE
rb_each(VALUE obj)
{
return rb_call(obj, idEach, 0, 0, CALL_FCALL);
}
static VALUE
eval_string_with_cref(VALUE self, VALUE src, VALUE scope, NODE *const cref_arg, volatile VALUE file, volatile int line)
{
int state;
VALUE result = Qundef;
VALUE envval;
rb_thread_t *th = GET_THREAD();
rb_env_t *env = NULL;
rb_block_t block, *base_block;
volatile int parse_in_eval;
volatile int mild_compile_error;
NODE *orig_cref;
VALUE crefval;
if (file == 0) {
file = rb_sourcefilename();
line = rb_sourceline();
}
parse_in_eval = th->parse_in_eval;
mild_compile_error = th->mild_compile_error;
TH_PUSH_TAG(th);
if ((state = TH_EXEC_TAG()) == 0) {
NODE *cref = cref_arg;
rb_binding_t *bind = 0;
rb_iseq_t *iseq;
volatile VALUE iseqval;
VALUE absolute_path = Qnil;
VALUE fname;
if (file != Qundef) {
absolute_path = file;
}
if (scope != Qnil) {
bind = Check_TypedStruct(scope, &ruby_binding_data_type);
{
envval = bind->env;
if (NIL_P(absolute_path) && !NIL_P(bind->path)) {
file = bind->path;
line = bind->first_lineno;
absolute_path = rb_current_realfilepath();
}
}
GetEnvPtr(envval, env);
base_block = &env->block;
}
else {
rb_control_frame_t *cfp = rb_vm_get_ruby_level_next_cfp(th, th->cfp);
if (cfp != 0) {
block = *RUBY_VM_GET_BLOCK_PTR_IN_CFP(cfp);
base_block = &block;
base_block->self = self;
base_block->iseq = cfp->iseq; /* TODO */
}
else {
rb_raise(rb_eRuntimeError, "Can't eval on top of Fiber or Thread");
}
}
if ((fname = file) == Qundef) {
fname = rb_usascii_str_new_cstr("(eval)");
}
if (RTEST(fname))
fname = rb_fstring(fname);
if (RTEST(absolute_path))
absolute_path = rb_fstring(absolute_path);
/* make eval iseq */
th->parse_in_eval++;
th->mild_compile_error++;
iseqval = rb_iseq_compile_with_option(src, fname, absolute_path, INT2FIX(line), base_block, Qnil);
th->mild_compile_error--;
th->parse_in_eval--;
if (!cref && base_block->iseq) {
orig_cref = rb_vm_get_cref(base_block->iseq, base_block->ep);
cref = NEW_CREF(Qnil);
crefval = (VALUE) cref;
COPY_CREF(cref, orig_cref);
}
vm_set_eval_stack(th, iseqval, cref, base_block);
RB_GC_GUARD(crefval);
if (0) { /* for debug */
VALUE disasm = rb_iseq_disasm(iseqval);
printf("%s\n", StringValuePtr(disasm));
}
/* save new env */
GetISeqPtr(iseqval, iseq);
if (bind && iseq->local_table_size > 0) {
bind->env = rb_vm_make_env_object(th, th->cfp);
}
/* kick */
result = vm_exec(th);
}
TH_POP_TAG();
th->mild_compile_error = mild_compile_error;
th->parse_in_eval = parse_in_eval;
if (state) {
if (state == TAG_RAISE) {
VALUE errinfo = th->errinfo;
if (file == Qundef) {
VALUE mesg, errat, bt2;
ID id_mesg;
CONST_ID(id_mesg, "mesg");
errat = rb_get_backtrace(errinfo);
mesg = rb_attr_get(errinfo, id_mesg);
if (!NIL_P(errat) && RB_TYPE_P(errat, T_ARRAY) &&
(bt2 = rb_vm_backtrace_str_ary(th, 0, 0), RARRAY_LEN(bt2) > 0)) {
if (!NIL_P(mesg) && RB_TYPE_P(mesg, T_STRING) && !RSTRING_LEN(mesg)) {
if (OBJ_FROZEN(mesg)) {
VALUE m = rb_str_cat(rb_str_dup(RARRAY_AREF(errat, 0)), ": ", 2);
rb_ivar_set(errinfo, id_mesg, rb_str_append(m, mesg));
}
else {
rb_str_update(mesg, 0, 0, rb_str_new2(": "));
rb_str_update(mesg, 0, 0, RARRAY_AREF(errat, 0));
}
}
RARRAY_ASET(errat, 0, RARRAY_AREF(bt2, 0));
}
}
rb_exc_raise(errinfo);
}
JUMP_TAG(state);
}
return result;
}
static VALUE
eval_string(VALUE self, VALUE src, VALUE scope, VALUE file, int line)
{
return eval_string_with_cref(self, src, scope, 0, file, line);
}
/*
* call-seq:
* eval(string [, binding [, filename [,lineno]]]) -> obj
*
* Evaluates the Ruby expression(s) in <em>string</em>. If
* <em>binding</em> is given, which must be a <code>Binding</code>
* object, the evaluation is performed in its context. If the
* optional <em>filename</em> and <em>lineno</em> parameters are
* present, they will be used when reporting syntax errors.
*
* def get_binding(str)
* return binding
* end
* str = "hello"
* eval "str + ' Fred'" #=> "hello Fred"
* eval "str + ' Fred'", get_binding("bye") #=> "bye Fred"
*/
VALUE
rb_f_eval(int argc, const VALUE *argv, VALUE self)
{
VALUE src, scope, vfile, vline;
VALUE file = Qundef;
int line = 1;
rb_scan_args(argc, argv, "13", &src, &scope, &vfile, &vline);
SafeStringValue(src);
if (argc >= 3) {
StringValue(vfile);
}
if (argc >= 4) {
line = NUM2INT(vline);
}
if (!NIL_P(vfile))
file = vfile;
return eval_string(self, src, scope, file, line);
}
/** @note This function name is not stable. */
VALUE
ruby_eval_string_from_file(const char *str, const char *filename)
{
VALUE file = filename ? rb_str_new_cstr(filename) : 0;
return eval_string(rb_vm_top_self(), rb_str_new2(str), Qnil, file, 1);
}
struct eval_string_from_file_arg {
VALUE str;
VALUE filename;
};
static VALUE
eval_string_from_file_helper(VALUE data)
{
const struct eval_string_from_file_arg *const arg = (struct eval_string_from_file_arg*)data;
return eval_string(rb_vm_top_self(), arg->str, Qnil, arg->filename, 1);
}
VALUE
ruby_eval_string_from_file_protect(const char *str, const char *filename, int *state)
{
struct eval_string_from_file_arg arg;
arg.str = rb_str_new_cstr(str);
arg.filename = filename ? rb_str_new_cstr(filename) : 0;
return rb_protect(eval_string_from_file_helper, (VALUE)&arg, state);
}
/**
* Evaluates the given string in an isolated binding.
*
* Here "isolated" means the binding does not inherit any other binding. This
* behaves same as the binding for required libraries.
*
* __FILE__ will be "(eval)", and __LINE__ starts from 1 in the evaluation.
*
* @param str Ruby code to evaluate.
* @return The evaluated result.
* @throw Exception Raises an exception on error.
*/
VALUE
rb_eval_string(const char *str)
{
return ruby_eval_string_from_file(str, "eval");
}
/**
* Evaluates the given string in an isolated binding.
*
* __FILE__ will be "(eval)", and __LINE__ starts from 1 in the evaluation.
*
* @sa rb_eval_string
* @param str Ruby code to evaluate.
* @param state Being set to zero if succeeded. Nonzero if an error occurred.
* @return The evaluated result if succeeded, an undefined value if otherwise.
*/
VALUE
rb_eval_string_protect(const char *str, int *state)
{
return rb_protect((VALUE (*)(VALUE))rb_eval_string, (VALUE)str, state);
}
/**
* Evaluates the given string under a module binding in an isolated binding.
* This is same as the binding for required libraries on "require('foo', true)".
*
* __FILE__ will be "(eval)", and __LINE__ starts from 1 in the evaluation.
*
* @sa rb_eval_string
* @param str Ruby code to evaluate.
* @param state Being set to zero if succeeded. Nonzero if an error occurred.
* @return The evaluated result if succeeded, an undefined value if otherwise.
*/
VALUE
rb_eval_string_wrap(const char *str, int *state)
{
int status;
rb_thread_t *th = GET_THREAD();
VALUE self = th->top_self;
VALUE wrapper = th->top_wrapper;
VALUE val;
th->top_wrapper = rb_module_new();
th->top_self = rb_obj_clone(rb_vm_top_self());
rb_extend_object(th->top_self, th->top_wrapper);
val = rb_eval_string_protect(str, &status);
th->top_self = self;
th->top_wrapper = wrapper;
if (state) {
*state = status;
}
else if (status) {
JUMP_TAG(status);
}
return val;
}
VALUE
rb_eval_cmd(VALUE cmd, VALUE arg, int level)
{
int state;
volatile VALUE val = Qnil; /* OK */
volatile int safe = rb_safe_level();
if (OBJ_TAINTED(cmd)) {
level = 4;
}
if (!RB_TYPE_P(cmd, T_STRING)) {
PUSH_TAG();
rb_set_safe_level_force(level);
if ((state = EXEC_TAG()) == 0) {
val = rb_funcall2(cmd, rb_intern("call"), RARRAY_LENINT(arg),
RARRAY_CONST_PTR(arg));
}
POP_TAG();
rb_set_safe_level_force(safe);
if (state)
JUMP_TAG(state);
return val;
}
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
val = eval_string(rb_vm_top_self(), cmd, Qnil, 0, 0);
}
POP_TAG();
rb_set_safe_level_force(safe);
if (state) JUMP_TAG(state);
return val;
}
/* block eval under the class/module context */
static VALUE
yield_under(VALUE under, VALUE self, VALUE values)
{
rb_thread_t *th = GET_THREAD();
rb_block_t block, *blockptr;
NODE *cref;
if ((blockptr = VM_CF_BLOCK_PTR(th->cfp)) != 0) {
block = *blockptr;
block.self = self;
VM_CF_LEP(th->cfp)[0] = VM_ENVVAL_BLOCK_PTR(&block);
}
cref = vm_cref_push(th, under, NOEX_PUBLIC, blockptr);
cref->flags |= NODE_FL_CREF_PUSHED_BY_EVAL;
if (values == Qundef) {
return vm_yield_with_cref(th, 1, &self, cref);
}
else {
return vm_yield_with_cref(th, RARRAY_LENINT(values), RARRAY_CONST_PTR(values), cref);
}
}
VALUE
rb_yield_refine_block(VALUE refinement, VALUE refinements)
{
rb_thread_t *th = GET_THREAD();
rb_block_t block, *blockptr;
NODE *cref;
if ((blockptr = VM_CF_BLOCK_PTR(th->cfp)) != 0) {
block = *blockptr;
block.self = refinement;
VM_CF_LEP(th->cfp)[0] = VM_ENVVAL_BLOCK_PTR(&block);
}
cref = vm_cref_push(th, refinement, NOEX_PUBLIC, blockptr);
cref->flags |= NODE_FL_CREF_PUSHED_BY_EVAL;
RB_OBJ_WRITE(cref, &cref->nd_refinements, refinements);
return vm_yield_with_cref(th, 0, NULL, cref);
}
/* string eval under the class/module context */
static VALUE
eval_under(VALUE under, VALUE self, VALUE src, VALUE file, int line)
{
NODE *cref = vm_cref_push(GET_THREAD(), under, NOEX_PUBLIC, NULL);
if (SPECIAL_CONST_P(self) && !NIL_P(under)) {
cref->flags |= NODE_FL_CREF_PUSHED_BY_EVAL;
}
SafeStringValue(src);
return eval_string_with_cref(self, src, Qnil, cref, file, line);
}
static VALUE
specific_eval(int argc, const VALUE *argv, VALUE klass, VALUE self)
{
if (rb_block_given_p()) {
rb_check_arity(argc, 0, 0);
return yield_under(klass, self, Qundef);
}
else {
VALUE file = Qundef;
int line = 1;
VALUE code;
rb_check_arity(argc, 1, 3);
code = argv[0];
SafeStringValue(code);
if (argc > 2)
line = NUM2INT(argv[2]);
if (argc > 1) {
file = argv[1];
if (!NIL_P(file)) StringValue(file);
}
return eval_under(klass, self, code, file, line);
}
}
/*
* call-seq:
* obj.instance_eval(string [, filename [, lineno]] ) -> obj
* obj.instance_eval {|obj| block } -> obj
*
* Evaluates a string containing Ruby source code, or the given block,
* within the context of the receiver (_obj_). In order to set the
* context, the variable +self+ is set to _obj_ while
* the code is executing, giving the code access to _obj_'s
* instance variables and private methods.
*
* When <code>instance_eval</code> is given a block, _obj_ is also
* passed in as the block's only argument.
*
* When <code>instance_eval</code> is given a +String+, the optional
* second and third parameters supply a filename and starting line number
* that are used when reporting compilation errors.
*
* class KlassWithSecret
* def initialize
* @secret = 99
* end
* private
* def the_secret
* "Ssssh! The secret is #{@secret}."
* end
* end
* k = KlassWithSecret.new
* k.instance_eval { @secret } #=> 99
* k.instance_eval { the_secret } #=> "Ssssh! The secret is 99."
* k.instance_eval {|obj| obj == self } #=> true
*/
VALUE
rb_obj_instance_eval(int argc, const VALUE *argv, VALUE self)
{
VALUE klass;
if (SPECIAL_CONST_P(self)) {
klass = rb_special_singleton_class(self);
}
else {
klass = rb_singleton_class(self);
}
return specific_eval(argc, argv, klass, self);
}
/*
* call-seq:
* obj.instance_exec(arg...) {|var...| block } -> obj
*
* Executes the given block within the context of the receiver
* (_obj_). In order to set the context, the variable +self+ is set
* to _obj_ while the code is executing, giving the code access to
* _obj_'s instance variables. Arguments are passed as block parameters.
*
* class KlassWithSecret
* def initialize
* @secret = 99
* end
* end
* k = KlassWithSecret.new
* k.instance_exec(5) {|x| @secret+x } #=> 104
*/
VALUE
rb_obj_instance_exec(int argc, const VALUE *argv, VALUE self)
{
VALUE klass;
if (SPECIAL_CONST_P(self)) {
klass = rb_special_singleton_class(self);
}
else {
klass = rb_singleton_class(self);
}
return yield_under(klass, self, rb_ary_new4(argc, argv));
}
/*
* call-seq:
* mod.class_eval(string [, filename [, lineno]]) -> obj
* mod.module_eval {|| block } -> obj
*
* Evaluates the string or block in the context of _mod_, except that when
* a block is given, constant/class variable lookup is not affected. This
* can be used to add methods to a class. <code>module_eval</code> returns
* the result of evaluating its argument. The optional _filename_ and
* _lineno_ parameters set the text for error messages.
*
* class Thing
* end
* a = %q{def hello() "Hello there!" end}
* Thing.module_eval(a)
* puts Thing.new.hello()
* Thing.module_eval("invalid code", "dummy", 123)
*
* <em>produces:</em>
*
* Hello there!
* dummy:123:in `module_eval': undefined local variable
* or method `code' for Thing:Class
*/
VALUE
rb_mod_module_eval(int argc, const VALUE *argv, VALUE mod)
{
return specific_eval(argc, argv, mod, mod);
}
/*
* call-seq:
* mod.module_exec(arg...) {|var...| block } -> obj
* mod.class_exec(arg...) {|var...| block } -> obj
*
* Evaluates the given block in the context of the class/module.
* The method defined in the block will belong to the receiver.
* Any arguments passed to the method will be passed to the block.
* This can be used if the block needs to access instance variables.
*
* class Thing
* end
* Thing.class_exec{
* def hello() "Hello there!" end
* }
* puts Thing.new.hello()
*
* <em>produces:</em>
*
* Hello there!
*/
VALUE
rb_mod_module_exec(int argc, const VALUE *argv, VALUE mod)
{
return yield_under(mod, mod, rb_ary_new4(argc, argv));
}
/*
* call-seq:
* throw(tag [, obj])
*
* Transfers control to the end of the active +catch+ block
* waiting for _tag_. Raises +ArgumentError+ if there
* is no +catch+ block for the _tag_. The optional second
* parameter supplies a return value for the +catch+ block,
* which otherwise defaults to +nil+. For examples, see
* <code>Kernel::catch</code>.
*/
static VALUE
rb_f_throw(int argc, VALUE *argv)
{
VALUE tag, value;
rb_scan_args(argc, argv, "11", &tag, &value);
rb_throw_obj(tag, value);
UNREACHABLE;
}
void
rb_throw_obj(VALUE tag, VALUE value)
{
rb_thread_t *th = GET_THREAD();
struct rb_vm_tag *tt = th->tag;
while (tt) {
if (tt->tag == tag) {
tt->retval = value;
break;
}
tt = tt->prev;
}
if (!tt) {
VALUE desc = rb_inspect(tag);
rb_raise(rb_eArgError, "uncaught throw %"PRIsVALUE, desc);
}
th->errinfo = NEW_THROW_OBJECT(tag, 0, TAG_THROW);
JUMP_TAG(TAG_THROW);
}
void
rb_throw(const char *tag, VALUE val)
{
rb_throw_obj(ID2SYM(rb_intern(tag)), val);
}
static VALUE
catch_i(VALUE tag, VALUE data)
{
return rb_yield_0(1, &tag);
}
/*
* call-seq:
* catch([tag]) {|tag| block } -> obj
*
* +catch+ executes its block. If +throw+ is not called,
* the block executes normally, and +catch+ returns the
* value of the last expression evaluated.
*
* catch(1) { 123 } # => 123
*
* If +throw(tag2, val)+ is called, Ruby searches up its
* stack for a +catch+ block whose _tag_ has the same
* +object_id+ as _tag2_. If found, the block stops
* executing and returns _val_ (or +nil+ if no second
* argument was given to +throw+).
*
* catch(1) { throw(1, 456) } # => 456
* catch(1) { throw(1) } # => nil
*
* When _tag_ is passed as the first argument, +catch+
* yields it as the parameter of the block.
*
* catch(1) {|x| x + 2 } # => 3
*
* When no _tag_ is given, +catch+ yields a new unique
* object (as from +Object.new+) as the block parameter.
* This object can then be used as the argument to
* +throw+, and will match the correct +catch+ block.
*
* catch do |obj_A|
* catch do |obj_B|
* throw(obj_B, 123)
* puts "This puts is not reached"
* end
*
* puts "This puts is displayed"
* 456
* end
*
* # => 456
*
* catch do |obj_A|
* catch do |obj_B|
* throw(obj_A, 123)
* puts "This puts is still not reached"
* end
*
* puts "Now this puts is also not reached"
* 456
* end
*
* # => 123
*/
static VALUE
rb_f_catch(int argc, VALUE *argv)
{
VALUE tag;
if (argc == 0) {
tag = rb_obj_alloc(rb_cObject);
}
else {
rb_scan_args(argc, argv, "01", &tag);
}
return rb_catch_obj(tag, catch_i, 0);
}
VALUE
rb_catch(const char *tag, VALUE (*func)(), VALUE data)
{
VALUE vtag = tag ? ID2SYM(rb_intern(tag)) : rb_obj_alloc(rb_cObject);
return rb_catch_obj(vtag, func, data);
}
VALUE
rb_catch_obj(VALUE t, VALUE (*func)(), VALUE data)
{
int state;
VALUE val = rb_catch_protect(t, (rb_block_call_func *)func, data, &state);
if (state)
JUMP_TAG(state);
return val;
}
VALUE
rb_catch_protect(VALUE t, rb_block_call_func *func, VALUE data, int *stateptr)
{
int state;
volatile VALUE val = Qnil; /* OK */
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *saved_cfp = th->cfp;
volatile VALUE tag = t;
TH_PUSH_TAG(th);
_tag.tag = tag;
if ((state = TH_EXEC_TAG()) == 0) {
/* call with argc=1, argv = [tag], block = Qnil to insure compatibility */
val = (*func)(tag, data, 1, (const VALUE *)&tag, Qnil);
}
else if (state == TAG_THROW && RNODE(th->errinfo)->u1.value == tag) {
rb_vm_rewind_cfp(th, saved_cfp);
val = th->tag->retval;
th->errinfo = Qnil;
state = 0;
}
TH_POP_TAG();
if (stateptr)
*stateptr = state;
return val;
}
static void
local_var_list_init(struct local_var_list *vars)
{
vars->tbl = rb_hash_new();
RHASH(vars->tbl)->ntbl = st_init_numtable(); /* compare_by_identity */
RBASIC_CLEAR_CLASS(vars->tbl);
}
static VALUE
local_var_list_finish(struct local_var_list *vars)
{
/* TODO: not to depend on the order of st_table */
VALUE ary = rb_hash_keys(vars->tbl);
rb_hash_clear(vars->tbl);
vars->tbl = 0;
return ary;
}
static int
local_var_list_update(st_data_t *key, st_data_t *value, st_data_t arg, int existing)
{
if (existing) return ST_STOP;
*value = (st_data_t)Qtrue; /* INT2FIX(arg) */
return ST_CONTINUE;
}
static void
local_var_list_add(const struct local_var_list *vars, ID lid)
{
if (lid && rb_id2str(lid)) {
/* should skip temporary variable */
st_table *tbl = RHASH_TBL_RAW(vars->tbl);
st_data_t idx = 0; /* tbl->num_entries */
st_update(tbl, ID2SYM(lid), local_var_list_update, idx);
}
}
/*
* call-seq:
* local_variables -> array
*
* Returns the names of the current local variables.
*
* fred = 1
* for i in 1..10
* # ...
* end
* local_variables #=> [:fred, :i]
*/
static VALUE
rb_f_local_variables(void)
{
struct local_var_list vars;
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *cfp =
vm_get_ruby_level_caller_cfp(th, RUBY_VM_PREVIOUS_CONTROL_FRAME(th->cfp));
int i;
local_var_list_init(&vars);
while (cfp) {
if (cfp->iseq) {
for (i = 0; i < cfp->iseq->local_table_size; i++) {
local_var_list_add(&vars, cfp->iseq->local_table[i]);
}
}
if (!VM_EP_LEP_P(cfp->ep)) {
/* block */
VALUE *ep = VM_CF_PREV_EP(cfp);
if (vm_collect_local_variables_in_heap(th, ep, &vars)) {
break;
}
else {
while (cfp->ep != ep) {
cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
}
}
}
else {
break;
}
}
return local_var_list_finish(&vars);
}
/*
* call-seq:
* block_given? -> true or false
* iterator? -> true or false
*
* Returns <code>true</code> if <code>yield</code> would execute a
* block in the current context. The <code>iterator?</code> form
* is mildly deprecated.
*
* def try
* if block_given?
* yield
* else
* "no block"
* end
* end
* try #=> "no block"
* try { "hello" } #=> "hello"
* try do "hello" end #=> "hello"
*/
VALUE
rb_f_block_given_p(void)
{
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *cfp = th->cfp;
cfp = vm_get_ruby_level_caller_cfp(th, RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp));
if (cfp != 0 && VM_CF_BLOCK_PTR(cfp)) {
return Qtrue;
}
else {
return Qfalse;
}
}
VALUE
rb_current_realfilepath(void)
{
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *cfp = th->cfp;
cfp = vm_get_ruby_level_caller_cfp(th, RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp));
if (cfp != 0) return cfp->iseq->location.absolute_path;
return Qnil;
}
void
Init_vm_eval(void)
{
rb_define_global_function("eval", rb_f_eval, -1);
rb_define_global_function("local_variables", rb_f_local_variables, 0);
rb_define_global_function("iterator?", rb_f_block_given_p, 0);
rb_define_global_function("block_given?", rb_f_block_given_p, 0);
rb_define_global_function("catch", rb_f_catch, -1);
rb_define_global_function("throw", rb_f_throw, -1);
rb_define_global_function("loop", rb_f_loop, 0);
rb_define_method(rb_cBasicObject, "instance_eval", rb_obj_instance_eval, -1);
rb_define_method(rb_cBasicObject, "instance_exec", rb_obj_instance_exec, -1);
rb_define_private_method(rb_cBasicObject, "method_missing", rb_method_missing, -1);
#if 1
rb_add_method(rb_cBasicObject, rb_intern("__send__"),
VM_METHOD_TYPE_OPTIMIZED, (void *)OPTIMIZED_METHOD_TYPE_SEND, 0);
rb_add_method(rb_mKernel, rb_intern("send"),
VM_METHOD_TYPE_OPTIMIZED, (void *)OPTIMIZED_METHOD_TYPE_SEND, 0);
#else
rb_define_method(rb_cBasicObject, "__send__", rb_f_send, -1);
rb_define_method(rb_mKernel, "send", rb_f_send, -1);
#endif
rb_define_method(rb_mKernel, "public_send", rb_f_public_send, -1);
rb_define_method(rb_cModule, "module_exec", rb_mod_module_exec, -1);
rb_define_method(rb_cModule, "class_exec", rb_mod_module_exec, -1);
rb_define_method(rb_cModule, "module_eval", rb_mod_module_eval, -1);
rb_define_method(rb_cModule, "class_eval", rb_mod_module_eval, -1);
}
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