/********************************************************************** 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, enum method_missing_reason call_status); static inline VALUE vm_yield_with_cref(rb_execution_context_t *ec, int argc, const VALUE *argv, const rb_cref_t *cref, int is_lambda); static inline VALUE vm_yield(rb_execution_context_t *ec, int argc, const VALUE *argv); static inline VALUE vm_yield_with_block(rb_execution_context_t *ec, int argc, const VALUE *argv, VALUE block_handler); static inline VALUE vm_yield_force_blockarg(rb_execution_context_t *ec, VALUE args); static VALUE vm_exec(rb_execution_context_t *ec); static void vm_set_eval_stack(rb_execution_context_t * th, const rb_iseq_t *iseq, const rb_cref_t *cref, const struct rb_block *base_block); static int vm_collect_local_variables_in_heap(const VALUE *dfp, const struct local_var_list *vars); static VALUE rb_eUncaughtThrow; static ID id_result, id_tag, id_value; #define id_mesg idMesg 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_execution_context_t* ec, struct rb_calling_info *calling, const struct rb_call_info *ci, struct rb_call_cache *cc, const VALUE *argv); static VALUE vm_call0(rb_execution_context_t *ec, VALUE recv, ID id, int argc, const VALUE *argv, const rb_callable_method_entry_t *me) { struct rb_calling_info calling_entry, *calling; struct rb_call_info ci_entry; struct rb_call_cache cc_entry; calling = &calling_entry; ci_entry.flag = 0; ci_entry.mid = id; cc_entry.me = me; calling->recv = recv; calling->argc = argc; return vm_call0_body(ec, calling, &ci_entry, &cc_entry, argv); } static VALUE vm_call0_cfunc_with_frame(rb_execution_context_t* ec, struct rb_calling_info *calling, const struct rb_call_info *ci, struct rb_call_cache *cc, const VALUE *argv) { VALUE val; const rb_callable_method_entry_t *me = cc->me; const rb_method_cfunc_t *cfunc = &me->def->body.cfunc; int len = cfunc->argc; VALUE recv = calling->recv; int argc = calling->argc; ID mid = ci->mid; VALUE block_handler = calling->block_handler; RUBY_DTRACE_CMETHOD_ENTRY_HOOK(rb_ec_thread_ptr(ec), me->owner, me->def->original_id); EXEC_EVENT_HOOK(ec, RUBY_EVENT_C_CALL, recv, me->def->original_id, mid, me->owner, Qnil); { rb_control_frame_t *reg_cfp = ec->cfp; vm_push_frame(ec, 0, VM_FRAME_MAGIC_CFUNC | VM_FRAME_FLAG_CFRAME | VM_ENV_FLAG_LOCAL, recv, block_handler, (VALUE)me, 0, reg_cfp->sp, 0, 0); if (len >= 0) rb_check_arity(argc, len, len); VM_PROFILE_UP(C2C_CALL); val = (*cfunc->invoker)(cfunc->func, recv, argc, argv); CHECK_CFP_CONSISTENCY("vm_call0_cfunc_with_frame"); VM_PROFILE_UP(C2C_POPF); rb_vm_pop_frame(ec); } EXEC_EVENT_HOOK(ec, RUBY_EVENT_C_RETURN, recv, me->def->original_id, mid, me->owner, val); RUBY_DTRACE_CMETHOD_RETURN_HOOK(rb_ec_thread_ptr(ec), me->owner, me->def->original_id); return val; } static VALUE vm_call0_cfunc(rb_execution_context_t *ec, struct rb_calling_info *calling, const struct rb_call_info *ci, struct rb_call_cache *cc, const VALUE *argv) { return vm_call0_cfunc_with_frame(ec, calling, ci, cc, argv); } /* `ci' should point temporal value (on stack value) */ static VALUE vm_call0_body(rb_execution_context_t *ec, struct rb_calling_info *calling, const struct rb_call_info *ci, struct rb_call_cache *cc, const VALUE *argv) { VALUE ret; calling->block_handler = vm_passed_block_handler(ec); again: switch (cc->me->def->type) { case VM_METHOD_TYPE_ISEQ: { rb_control_frame_t *reg_cfp = ec->cfp; int i; CHECK_VM_STACK_OVERFLOW(reg_cfp, calling->argc + 1); *reg_cfp->sp++ = calling->recv; for (i = 0; i < calling->argc; i++) { *reg_cfp->sp++ = argv[i]; } vm_call_iseq_setup(ec, reg_cfp, calling, ci, cc); VM_ENV_FLAGS_SET(ec->cfp->ep, VM_FRAME_FLAG_FINISH); return vm_exec(ec); /* CHECK_INTS in this function */ } case VM_METHOD_TYPE_NOTIMPLEMENTED: case VM_METHOD_TYPE_CFUNC: ret = vm_call0_cfunc(ec, calling, ci, cc, argv); goto success; case VM_METHOD_TYPE_ATTRSET: rb_check_arity(calling->argc, 1, 1); ret = rb_ivar_set(calling->recv, cc->me->def->body.attr.id, argv[0]); goto success; case VM_METHOD_TYPE_IVAR: rb_check_arity(calling->argc, 0, 0); ret = rb_attr_get(calling->recv, cc->me->def->body.attr.id); goto success; case VM_METHOD_TYPE_BMETHOD: ret = vm_call_bmethod_body(ec, calling, ci, cc, argv); goto success; case VM_METHOD_TYPE_ZSUPER: case VM_METHOD_TYPE_REFINED: { const rb_method_type_t type = cc->me->def->type; VALUE super_class = cc->me->defined_class; if (type == VM_METHOD_TYPE_ZSUPER) { super_class = RCLASS_ORIGIN(super_class); } else if (cc->me->def->body.refined.orig_me) { cc->me = refined_method_callable_without_refinement(cc->me); goto again; } super_class = RCLASS_SUPER(super_class); if (!super_class || !(cc->me = rb_callable_method_entry(super_class, ci->mid))) { enum method_missing_reason ex = (type == VM_METHOD_TYPE_ZSUPER) ? MISSING_SUPER : 0; ret = method_missing(calling->recv, ci->mid, calling->argc, argv, ex); goto success; } RUBY_VM_CHECK_INTS(ec); goto again; } case VM_METHOD_TYPE_ALIAS: cc->me = aliased_callable_method_entry(cc->me); goto again; case VM_METHOD_TYPE_MISSING: { vm_passed_block_handler_set(ec, calling->block_handler); return method_missing(calling->recv, ci->mid, calling->argc, argv, MISSING_NOENTRY); } case VM_METHOD_TYPE_OPTIMIZED: switch (cc->me->def->body.optimize_type) { case OPTIMIZED_METHOD_TYPE_SEND: ret = send_internal(calling->argc, argv, calling->recv, CALL_FCALL); goto success; case OPTIMIZED_METHOD_TYPE_CALL: { rb_proc_t *proc; GetProcPtr(calling->recv, proc); ret = rb_vm_invoke_proc(ec, proc, calling->argc, argv, calling->block_handler); goto success; } default: rb_bug("vm_call0: unsupported optimized method type (%d)", cc->me->def->body.optimize_type); } break; case VM_METHOD_TYPE_UNDEF: break; } rb_bug("vm_call0: unsupported method type (%d)", cc->me->def->type); return Qundef; success: RUBY_VM_CHECK_INTS(ec); return ret; } VALUE rb_vm_call(rb_execution_context_t *ec, VALUE recv, VALUE id, int argc, const VALUE *argv, const rb_callable_method_entry_t *me) { return vm_call0(ec, recv, id, argc, argv, me); } static inline VALUE vm_call_super(rb_execution_context_t *ec, int argc, const VALUE *argv) { VALUE recv = ec->cfp->self; VALUE klass; ID id; rb_control_frame_t *cfp = ec->cfp; const rb_callable_method_entry_t *me = rb_vm_frame_method_entry(cfp); if (VM_FRAME_RUBYFRAME_P(cfp)) { rb_bug("vm_call_super: should not be reached"); } klass = RCLASS_ORIGIN(me->defined_class); klass = RCLASS_SUPER(klass); id = me->def->original_id; me = rb_callable_method_entry(klass, id); if (!me) { return method_missing(recv, id, argc, argv, MISSING_SUPER); } else { return vm_call0(ec, recv, id, argc, argv, me); } } VALUE rb_call_super(int argc, const VALUE *argv) { rb_execution_context_t *ec = GET_EC(); PASS_PASSED_BLOCK_HANDLER_EC(ec); return vm_call_super(ec, argc, argv); } VALUE rb_current_receiver(void) { const rb_execution_context_t *ec = GET_EC(); rb_control_frame_t *cfp; if (!ec || !(cfp = ec->cfp)) { rb_raise(rb_eRuntimeError, "no self, no life"); } return cfp->self; } static inline void stack_check(rb_execution_context_t *ec) { if (!rb_ec_raised_p(ec, RAISED_STACKOVERFLOW) && rb_ec_stack_check(ec)) { rb_ec_raised_set(ec, RAISED_STACKOVERFLOW); rb_ec_stack_overflow(ec, FALSE); } } static inline const rb_callable_method_entry_t *rb_search_method_entry(VALUE recv, ID mid); static inline enum method_missing_reason rb_method_call_status(rb_execution_context_t *ec, const rb_callable_method_entry_t *me, call_type scope, VALUE self); /*! * \internal * calls the specified method. * * This function is called by functions in rb_call* family. * \param ec current execution context * \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(rb_execution_context_t *ec, VALUE recv, ID mid, int argc, const VALUE *argv, call_type scope, VALUE self) { const rb_callable_method_entry_t *me = rb_search_method_entry(recv, mid); enum method_missing_reason call_status = rb_method_call_status(ec, me, scope, self); if (call_status != MISSING_NONE) { return method_missing(recv, mid, argc, argv, call_status); } stack_check(ec); return vm_call0(ec, recv, mid, argc, argv, me); } struct rescue_funcall_args { VALUE defined_class; VALUE recv; ID mid; rb_execution_context_t *ec; const rb_method_entry_t *me; unsigned int respond: 1; unsigned int respond_to_missing: 1; int argc; const VALUE *argv; }; static VALUE check_funcall_exec(struct rescue_funcall_args *args) { return call_method_entry(args->ec, args->defined_class, args->recv, idMethodMissing, args->me, args->argc, args->argv); } static VALUE check_funcall_failed(struct rescue_funcall_args *args, VALUE e) { int ret = args->respond; if (!ret) { switch (rb_method_boundp(args->defined_class, args->mid, BOUND_PRIVATE|BOUND_RESPONDS)) { case 2: ret = TRUE; break; case 0: ret = args->respond_to_missing; break; default: ret = FALSE; break; } } if (ret) { rb_exc_raise(e); } return Qundef; } static int check_funcall_respond_to(rb_execution_context_t *ec, VALUE klass, VALUE recv, ID mid) { return vm_respond_to(ec, klass, recv, mid, TRUE); } static int check_funcall_callable(rb_execution_context_t *ec, const rb_callable_method_entry_t *me) { return rb_method_call_status(ec, me, CALL_FCALL, ec->cfp->self) == MISSING_NONE; } static VALUE check_funcall_missing(rb_execution_context_t *ec, VALUE klass, VALUE recv, ID mid, int argc, const VALUE *argv, int respond, VALUE def) { struct rescue_funcall_args args; const rb_method_entry_t *me; VALUE ret = Qundef; ret = basic_obj_respond_to_missing(ec, klass, recv, ID2SYM(mid), Qtrue); if (!RTEST(ret)) return def; args.respond = respond > 0; args.respond_to_missing = (ret != Qundef); ret = def; me = method_entry_get(klass, idMethodMissing, &args.defined_class); if (me && !METHOD_ENTRY_BASIC(me)) { VALUE argbuf, *new_args = ALLOCV_N(VALUE, argbuf, argc+1); new_args[0] = ID2SYM(mid); MEMCPY(new_args+1, argv, VALUE, argc); ec->method_missing_reason = MISSING_NOENTRY; args.ec = ec; args.recv = recv; args.me = me; args.mid = mid; args.argc = argc + 1; args.argv = new_args; ret = rb_rescue2(check_funcall_exec, (VALUE)&args, check_funcall_failed, (VALUE)&args, rb_eNoMethodError, (VALUE)0); ALLOCV_END(argbuf); } return ret; } VALUE rb_check_funcall(VALUE recv, ID mid, int argc, const VALUE *argv) { return rb_check_funcall_default(recv, mid, argc, argv, Qundef); } VALUE rb_check_funcall_default(VALUE recv, ID mid, int argc, const VALUE *argv, VALUE def) { VALUE klass = CLASS_OF(recv); const rb_callable_method_entry_t *me; rb_execution_context_t *ec = GET_EC(); int respond = check_funcall_respond_to(ec, klass, recv, mid); if (!respond) return def; me = rb_search_method_entry(recv, mid); if (!check_funcall_callable(ec, me)) { VALUE ret = check_funcall_missing(ec, klass, recv, mid, argc, argv, respond, def); if (ret == Qundef) ret = def; return ret; } stack_check(ec); return vm_call0(ec, recv, mid, argc, argv, me); } 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_callable_method_entry_t *me; rb_execution_context_t *ec = GET_EC(); int respond = check_funcall_respond_to(ec, klass, recv, mid); if (!respond) { (*hook)(FALSE, recv, mid, argc, argv, arg); return Qundef; } me = rb_search_method_entry(recv, mid); if (!check_funcall_callable(ec, me)) { VALUE ret = check_funcall_missing(ec, klass, recv, mid, argc, argv, respond, Qundef); (*hook)(ret != Qundef, recv, mid, argc, argv, arg); return ret; } stack_check(ec); (*hook)(TRUE, recv, mid, argc, argv, arg); return vm_call0(ec, recv, mid, argc, argv, me); } 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_IMEMO) type_case(T_UNDEF) type_case(T_NODE) type_case(T_ICLASS) type_case(T_ZOMBIE) case T_MASK: break; } #undef type_case return NULL; } NORETURN(static void uncallable_object(VALUE recv, ID mid)); static void uncallable_object(VALUE recv, ID mid) { VALUE flags; int type; const char *typestr; VALUE mname = rb_id2str(mid); if (SPECIAL_CONST_P(recv)) { rb_raise(rb_eNotImpError, "method `%"PRIsVALUE"' called on unexpected immediate object (%p)", mname, (void *)recv); } else if ((flags = RBASIC(recv)->flags) == 0) { rb_raise(rb_eNotImpError, "method `%"PRIsVALUE"' called on terminated object (%p)", mname, (void *)recv); } else if (!(typestr = rb_type_str(type = BUILTIN_TYPE(recv)))) { rb_raise(rb_eNotImpError, "method `%"PRIsVALUE"' called on broken T_?""?""?(0x%02x) object" " (%p flags=0x%"PRIxVALUE")", mname, type, (void *)recv, flags); } else if (T_OBJECT <= type && type < T_NIL) { rb_raise(rb_eNotImpError, "method `%"PRIsVALUE"' called on hidden %s object" " (%p flags=0x%"PRIxVALUE")", mname, typestr, (void *)recv, flags); } else { rb_raise(rb_eNotImpError, "method `%"PRIsVALUE"' called on unexpected %s object" " (%p flags=0x%"PRIxVALUE")", mname, typestr, (void *)recv, flags); } } static inline const rb_callable_method_entry_t * rb_search_method_entry(VALUE recv, ID mid) { VALUE klass = CLASS_OF(recv); if (!klass) uncallable_object(recv, mid); return rb_callable_method_entry(klass, mid); } static inline enum method_missing_reason rb_method_call_status(rb_execution_context_t *ec, const rb_callable_method_entry_t *me, call_type scope, VALUE self) { VALUE klass; ID oid; rb_method_visibility_t visi; if (UNDEFINED_METHOD_ENTRY_P(me)) { undefined: return scope == CALL_VCALL ? MISSING_VCALL : MISSING_NOENTRY; } if (me->def->type == VM_METHOD_TYPE_REFINED) { me = rb_resolve_refined_method_callable(Qnil, me); if (UNDEFINED_METHOD_ENTRY_P(me)) goto undefined; } klass = me->owner; oid = me->def->original_id; visi = METHOD_ENTRY_VISI(me); if (oid != idMethodMissing) { /* receiver specified form for private method */ if (UNLIKELY(visi != METHOD_VISI_PUBLIC)) { if (visi == METHOD_VISI_PRIVATE && scope == CALL_PUBLIC) { return MISSING_PRIVATE; } /* self must be kind of a specified form for protected method */ if (visi == METHOD_VISI_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 MISSING_PROTECTED; } } } } return MISSING_NONE; } /*! * \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_execution_context_t *ec = GET_EC(); return rb_call0(ec, recv, mid, argc, argv, scope, ec->cfp->self); } NORETURN(static void raise_method_missing(rb_execution_context_t *ec, int argc, const VALUE *argv, VALUE obj, enum method_missing_reason call_status)); /* * call-seq: * obj.method_missing(symbol [, *args] ) -> result * * Invoked by Ruby when obj is sent a message it cannot handle. * symbol is the symbol for the method called, and args * 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 * super should be called, so that ancestors can pick up the * missing method. * The example below creates * a class Roman, 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_execution_context_t *ec = GET_EC(); raise_method_missing(ec, argc, argv, obj, ec->method_missing_reason); UNREACHABLE; } static VALUE make_no_method_exception(VALUE exc, VALUE format, VALUE obj, int argc, const VALUE *argv, int priv) { int n = 0; enum { arg_mesg, arg_name, arg_args, arg_priv, args_size }; VALUE args[args_size]; if (!format) { format = rb_fstring_cstr("undefined method `%s' for %s%s%s"); } args[n++] = rb_name_err_mesg_new(format, obj, argv[0]); args[n++] = argv[0]; if (exc == rb_eNoMethodError) { args[n++] = rb_ary_new4(argc - 1, argv + 1); args[n++] = priv ? Qtrue : Qfalse; } return rb_class_new_instance(n, args, exc); } static void raise_method_missing(rb_execution_context_t *ec, int argc, const VALUE *argv, VALUE obj, enum method_missing_reason last_call_status) { VALUE exc = rb_eNoMethodError; VALUE format = 0; if (UNLIKELY(argc == 0)) { rb_raise(rb_eArgError, "no method name given"); } else if (UNLIKELY(!SYMBOL_P(argv[0]))) { const VALUE e = rb_eArgError; /* TODO: TypeError? */ rb_raise(e, "method name must be a Symbol but %"PRIsVALUE" is given", rb_obj_class(argv[0])); } stack_check(ec); if (last_call_status & MISSING_PRIVATE) { format = rb_fstring_cstr("private method `%s' called for %s%s%s"); } else if (last_call_status & MISSING_PROTECTED) { format = rb_fstring_cstr("protected method `%s' called for %s%s%s"); } else if (last_call_status & MISSING_VCALL) { format = rb_fstring_cstr("undefined local variable or method `%s' for %s%s%s"); exc = rb_eNameError; } else if (last_call_status & MISSING_SUPER) { format = rb_fstring_cstr("super: no superclass method `%s' for %s%s%s"); } { exc = make_no_method_exception(exc, format, obj, argc, argv, last_call_status & (MISSING_FCALL|MISSING_VCALL)); if (!(last_call_status & MISSING_MISSING)) { rb_vm_pop_cfunc_frame(); } rb_exc_raise(exc); } } static inline VALUE method_missing(VALUE obj, ID id, int argc, const VALUE *argv, enum method_missing_reason call_status) { VALUE *nargv, result, work, klass; rb_execution_context_t *ec = GET_EC(); VALUE block_handler = vm_passed_block_handler(ec); const rb_callable_method_entry_t *me; ec->method_missing_reason = call_status; if (id == idMethodMissing) { missing: raise_method_missing(ec, argc, argv, obj, call_status | MISSING_MISSING); } nargv = ALLOCV_N(VALUE, work, argc + 1); nargv[0] = ID2SYM(id); MEMCPY(nargv + 1, argv, VALUE, argc); ++argc; argv = nargv; klass = CLASS_OF(obj); if (!klass) goto missing; me = rb_callable_method_entry(klass, idMethodMissing); if (!me || METHOD_ENTRY_BASIC(me)) goto missing; vm_passed_block_handler_set(ec, block_handler); result = vm_call0(ec, obj, idMethodMissing, argc, argv, me); if (work) ALLOCV_END(work); return result; } void rb_raise_method_missing(rb_execution_context_t *ec, int argc, const VALUE *argv, VALUE obj, int call_status) { vm_passed_block_handler_set(ec, VM_BLOCK_HANDLER_NONE); raise_method_missing(ec, argc, argv, obj, call_status | MISSING_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); } #undef rb_funcall /*! * 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_funcallv 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_HANDLER(); return rb_call(recv, mid, argc, argv, CALL_PUBLIC); } VALUE rb_funcall_with_block(VALUE recv, ID mid, int argc, const VALUE *argv, VALUE passed_procval) { if (!NIL_P(passed_procval)) { vm_passed_block_handler_set(GET_EC(), passed_procval); } return rb_call(recv, mid, argc, argv, CALL_PUBLIC); } static VALUE * current_vm_stack_arg(const rb_execution_context_t *ec, const VALUE *argv) { rb_control_frame_t *prev_cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(ec->cfp); if (RUBY_VM_CONTROL_FRAME_STACK_OVERFLOW_P(ec, prev_cfp)) return NULL; if (prev_cfp->sp + 1 != argv) return NULL; return prev_cfp->sp + 1; } static VALUE send_internal(int argc, const VALUE *argv, VALUE recv, call_type scope) { ID id; VALUE vid; VALUE self; VALUE ret, vargv = 0; rb_execution_context_t *ec = GET_EC(); if (scope == CALL_PUBLIC) { self = Qundef; } else { self = RUBY_VM_PREVIOUS_CONTROL_FRAME(ec->cfp)->self; } if (argc == 0) { rb_raise(rb_eArgError, "no method name given"); } vid = *argv; 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, 0, recv, argc, argv, scope != CALL_PUBLIC); rb_exc_raise(exc); } if (!SYMBOL_P(*argv)) { VALUE *tmp_argv = current_vm_stack_arg(ec, argv); vid = rb_str_intern(vid); if (tmp_argv) { tmp_argv[0] = vid; } else if (argc > 1) { tmp_argv = ALLOCV_N(VALUE, vargv, argc); tmp_argv[0] = vid; MEMCPY(tmp_argv+1, argv+1, VALUE, argc-1); argv = tmp_argv; } else { argv = &vid; } } id = idMethodMissing; ec->method_missing_reason = MISSING_NOENTRY; } else { argv++; argc--; } PASS_PASSED_BLOCK_HANDLER_EC(ec); ret = rb_call0(ec, recv, id, argc, argv, scope, self); ALLOCV_END(vargv); return ret; } /* * 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 __send__ 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_EC(), argc, argv); } VALUE rb_yield_1(VALUE val) { return rb_yield_0(1, &val); } VALUE rb_yield(VALUE val) { if (val == Qundef) { return rb_yield_0(0, 0); } else { return rb_yield_1(val); } } #undef rb_yield_values 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 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. In this case, * loop returns the "result" value stored in the exception. * * enum = Enumerator.new { |y| * y << "one" * y << "two" * :ok * } * * result = loop { * puts enum.next * } #=> :ok */ static VALUE rb_f_loop(VALUE self) { RETURN_SIZED_ENUMERATOR(self, 0, 0, rb_f_loop_size); return rb_rescue2(loop_i, (VALUE)0, loop_stop, (VALUE)0, rb_eStopIteration, (VALUE)0); } #if VMDEBUG static const char * vm_frametype_name(const rb_control_frame_t *cfp); #endif static VALUE rb_iterate0(VALUE (* it_proc) (VALUE), VALUE data1, const struct vm_ifunc *const ifunc, rb_execution_context_t *ec) { enum ruby_tag_type state; volatile VALUE retval = Qnil; rb_control_frame_t *const cfp = ec->cfp; EC_PUSH_TAG(ec); state = EC_EXEC_TAG(); if (state == 0) { iter_retry: { VALUE block_handler; if (ifunc) { struct rb_captured_block *captured = VM_CFP_TO_CAPTURED_BLOCK(cfp); captured->code.ifunc = ifunc; block_handler = VM_BH_FROM_IFUNC_BLOCK(captured); } else { block_handler = VM_CF_BLOCK_HANDLER(cfp); } vm_passed_block_handler_set(ec, block_handler); } retval = (*it_proc) (data1); } else if (state == TAG_BREAK || state == TAG_RETRY) { const struct vm_throw_data *const err = (struct vm_throw_data *)ec->errinfo; const rb_control_frame_t *const escape_cfp = THROW_DATA_CATCH_FRAME(err); if (cfp == escape_cfp) { rb_vm_rewind_cfp(ec, cfp); state = 0; ec->tag->state = TAG_NONE; ec->errinfo = Qnil; if (state == TAG_RETRY) goto iter_retry; retval = THROW_DATA_VAL(err); } else if (0) { SDR(); fprintf(stderr, "%p, %p\n", cfp, escape_cfp); } } EC_POP_TAG(); if (state) { EC_JUMP_TAG(ec, state); } return retval; } VALUE rb_iterate(VALUE (* it_proc)(VALUE), VALUE data1, VALUE (* bl_proc)(ANYARGS), VALUE data2) { return rb_iterate0(it_proc, data1, bl_proc ? rb_vm_ifunc_proc_new(bl_proc, (void *)data2) : 0, GET_EC()); } 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); } VALUE rb_lambda_call(VALUE obj, ID mid, int argc, const VALUE *argv, rb_block_call_func_t bl_proc, int min_argc, int max_argc, VALUE data2) { struct iter_method_arg arg; struct vm_ifunc *block; if (!bl_proc) rb_raise(rb_eArgError, "NULL lambda function"); arg.obj = obj; arg.mid = mid; arg.argc = argc; arg.argv = argv; block = rb_vm_ifunc_new(bl_proc, (void *)data2, min_argc, max_argc); return rb_iterate0(iterate_method, (VALUE)&arg, block, GET_EC()); } 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 adjust_backtrace_in_eval(const rb_execution_context_t *ec, VALUE errinfo) { VALUE errat = rb_get_backtrace(errinfo); VALUE mesg = rb_attr_get(errinfo, id_mesg); if (RB_TYPE_P(errat, T_ARRAY)) { VALUE bt2 = rb_ec_backtrace_str_ary(ec, 0, 0); if (RARRAY_LEN(bt2) > 0) { if (RB_TYPE_P(mesg, T_STRING) && !RSTRING_LEN(mesg)) { rb_ivar_set(errinfo, id_mesg, RARRAY_AREF(errat, 0)); } RARRAY_ASET(errat, 0, RARRAY_AREF(bt2, 0)); } } return errinfo; } static VALUE eval_string_with_cref(VALUE self, VALUE src, VALUE scope, rb_cref_t *const cref_arg, VALUE filename, int lineno) { int state; VALUE result = Qundef; rb_execution_context_t *ec = GET_EC(); struct rb_block block; const struct rb_block *base_block; volatile VALUE file; volatile int line; file = filename ? filename : rb_source_location(&lineno); line = lineno; { rb_cref_t *cref = cref_arg; rb_binding_t *bind = 0; const rb_iseq_t *iseq; VALUE realpath = Qnil; VALUE fname; if (file != Qundef) { realpath = file; } if (!NIL_P(scope)) { bind = Check_TypedStruct(scope, &ruby_binding_data_type); if (NIL_P(realpath)) { file = pathobj_path(bind->pathobj); realpath = pathobj_realpath(bind->pathobj); line = bind->first_lineno; } base_block = &bind->block; } else { rb_control_frame_t *cfp = rb_vm_get_ruby_level_next_cfp(ec, ec->cfp); if (cfp != 0) { block.as.captured = *VM_CFP_TO_CAPTURED_BLOCK(cfp); block.as.captured.self = self; block.as.captured.code.iseq = cfp->iseq; block.type = block_type_iseq; base_block = █ } 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)"); } /* make eval iseq */ iseq = rb_iseq_compile_with_option(src, fname, realpath, INT2FIX(line), base_block, Qnil); if (!iseq) { rb_exc_raise(adjust_backtrace_in_eval(ec, ec->errinfo)); } /* TODO: what the code checking? */ if (!cref && base_block->as.captured.code.val) { if (NIL_P(scope)) { rb_cref_t *orig_cref = rb_vm_get_cref(vm_block_ep(base_block)); cref = vm_cref_dup(orig_cref); } else { cref = NULL; /* use stacked CREF */ } } vm_set_eval_stack(ec, iseq, cref, base_block); if (0) { /* for debug */ VALUE disasm = rb_iseq_disasm(iseq); printf("%s\n", StringValuePtr(disasm)); } /* save new env */ if (bind && iseq->body->local_table_size > 0) { vm_bind_update_env(scope, bind, vm_make_env_object(ec, ec->cfp)); } } if (file != Qundef) { /* kick */ return vm_exec(ec); } EC_PUSH_TAG(ec); if ((state = EC_EXEC_TAG()) == TAG_NONE) { result = vm_exec(ec); } EC_POP_TAG(); if (state) { if (state == TAG_RAISE) { adjust_backtrace_in_eval(ec, ec->errinfo); } EC_JUMP_TAG(ec, 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 string. If * binding is given, which must be a Binding * object, the evaluation is performed in its context. If the * optional filename and lineno 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 *pstate) { return rb_protect((VALUE (*)(VALUE))rb_eval_string, (VALUE)str, pstate); } /** * Evaluates the given string under a module binding in an isolated binding. * This is same as the binding for loaded libraries on "load('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 *pstate) { int state; 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, &state); th->top_self = self; th->top_wrapper = wrapper; if (pstate) { *pstate = state; } else if (state != TAG_NONE) { EC_JUMP_TAG(th->ec, state); } return val; } VALUE rb_eval_cmd(VALUE cmd, VALUE arg, int level) { enum ruby_tag_type state; volatile VALUE val = Qnil; /* OK */ const int VAR_NOCLOBBERED(safe) = rb_safe_level(); rb_execution_context_t * volatile ec = GET_EC(); if (OBJ_TAINTED(cmd)) { level = RUBY_SAFE_LEVEL_MAX; } EC_PUSH_TAG(ec); rb_set_safe_level_force(level); if ((state = EC_EXEC_TAG()) == TAG_NONE) { if (!RB_TYPE_P(cmd, T_STRING)) { val = rb_funcallv(cmd, idCall, RARRAY_LENINT(arg), RARRAY_CONST_PTR(arg)); } else { val = eval_string(rb_vm_top_self(), cmd, Qnil, 0, 0); } } EC_POP_TAG(); rb_set_safe_level_force(safe); if (state) EC_JUMP_TAG(ec, state); return val; } /* block eval under the class/module context */ static VALUE yield_under(VALUE under, VALUE self, int argc, const VALUE *argv) { rb_execution_context_t *ec = GET_EC(); rb_control_frame_t *cfp = ec->cfp; VALUE block_handler = VM_CF_BLOCK_HANDLER(cfp); VALUE new_block_handler = 0; const struct rb_captured_block *captured = NULL; struct rb_captured_block new_captured; const VALUE *ep = NULL; rb_cref_t *cref; int is_lambda = FALSE; if (block_handler != VM_BLOCK_HANDLER_NONE) { again: switch (vm_block_handler_type(block_handler)) { case block_handler_type_iseq: captured = VM_BH_TO_CAPT_BLOCK(block_handler); new_captured = *captured; new_block_handler = VM_BH_FROM_ISEQ_BLOCK(&new_captured); break; case block_handler_type_ifunc: captured = VM_BH_TO_CAPT_BLOCK(block_handler); new_captured = *captured; new_block_handler = VM_BH_FROM_IFUNC_BLOCK(&new_captured); break; case block_handler_type_proc: is_lambda = rb_proc_lambda_p(block_handler) != Qfalse; block_handler = vm_proc_to_block_handler(VM_BH_TO_PROC(block_handler)); goto again; case block_handler_type_symbol: return rb_sym_proc_call(SYM2ID(VM_BH_TO_SYMBOL(block_handler)), argc, argv, VM_BLOCK_HANDLER_NONE); } new_captured.self = self; ep = captured->ep; VM_FORCE_WRITE_SPECIAL_CONST(&VM_CF_LEP(ec->cfp)[VM_ENV_DATA_INDEX_SPECVAL], new_block_handler); } cref = vm_cref_push(ec, under, ep, TRUE); return vm_yield_with_cref(ec, argc, argv, cref, is_lambda); } VALUE rb_yield_refine_block(VALUE refinement, VALUE refinements) { rb_execution_context_t *ec = GET_EC(); VALUE block_handler = VM_CF_BLOCK_HANDLER(ec->cfp); if (vm_block_handler_type(block_handler) != block_handler_type_iseq) { rb_bug("rb_yield_refine_block: an iseq block is required"); } else { const struct rb_captured_block *captured = VM_BH_TO_ISEQ_BLOCK(block_handler); struct rb_captured_block new_captured = *captured; VALUE new_block_handler = VM_BH_FROM_ISEQ_BLOCK(&new_captured); const VALUE *ep = captured->ep; rb_cref_t *cref = vm_cref_push(ec, refinement, ep, TRUE); CREF_REFINEMENTS_SET(cref, refinements); VM_FORCE_WRITE_SPECIAL_CONST(&VM_CF_LEP(ec->cfp)[VM_ENV_DATA_INDEX_SPECVAL], new_block_handler); new_captured.self = refinement; return vm_yield_with_cref(ec, 0, NULL, cref, FALSE); } } /* string eval under the class/module context */ static VALUE eval_under(VALUE under, VALUE self, VALUE src, VALUE file, int line) { rb_cref_t *cref = vm_cref_push(GET_EC(), under, NULL, SPECIAL_CONST_P(self) && !NIL_P(under)); 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, 1, &self); } 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); } } static VALUE singleton_class_for_eval(VALUE self) { if (SPECIAL_CONST_P(self)) { return rb_special_singleton_class(self); } switch (BUILTIN_TYPE(self)) { case T_FLOAT: case T_BIGNUM: case T_SYMBOL: return Qnil; case T_STRING: if (FL_TEST_RAW(self, RSTRING_FSTR)) return Qnil; default: return rb_singleton_class(self); } } /* * 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 instance_eval is given a block, _obj_ is also * passed in as the block's only argument. * * When instance_eval 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 = singleton_class_for_eval(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 = singleton_class_for_eval(self); return yield_under(klass, self, argc, argv); } /* * call-seq: * mod.class_eval(string [, filename [, lineno]]) -> obj * mod.class_eval {|mod| block } -> obj * mod.module_eval(string [, filename [, lineno]]) -> obj * mod.module_eval {|mod| 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. module_eval 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) * * produces: * * 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() * * produces: * * Hello there! */ VALUE rb_mod_module_exec(int argc, const VALUE *argv, VALUE mod) { return yield_under(mod, mod, argc, argv); } /* * Document-class: UncaughtThrowError * * Raised when +throw+ is called with a _tag_ which does not have * corresponding +catch+ block. * * throw "foo", "bar" * * raises the exception: * * UncaughtThrowError: uncaught throw "foo" */ static VALUE uncaught_throw_init(int argc, const VALUE *argv, VALUE exc) { rb_check_arity(argc, 2, UNLIMITED_ARGUMENTS); rb_call_super(argc - 2, argv + 2); rb_ivar_set(exc, id_tag, argv[0]); rb_ivar_set(exc, id_value, argv[1]); return exc; } /* * call-seq: * uncaught_throw.tag -> obj * * Return the tag object which was called for. */ static VALUE uncaught_throw_tag(VALUE exc) { return rb_ivar_get(exc, id_tag); } /* * call-seq: * uncaught_throw.value -> obj * * Return the return value which was called for. */ static VALUE uncaught_throw_value(VALUE exc) { return rb_ivar_get(exc, id_value); } /* * call-seq: * uncaught_throw.to_s -> string * * Returns formatted message with the inspected tag. */ static VALUE uncaught_throw_to_s(VALUE exc) { VALUE mesg = rb_attr_get(exc, id_mesg); VALUE tag = uncaught_throw_tag(exc); return rb_str_format(1, &tag, mesg); } /* * call-seq: * throw(tag [, obj]) * * Transfers control to the end of the active +catch+ block * waiting for _tag_. Raises +UncaughtThrowError+ 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 * Kernel::catch. */ 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_execution_context_t *ec = GET_EC(); struct rb_vm_tag *tt = ec->tag; while (tt) { if (tt->tag == tag) { tt->retval = value; break; } tt = tt->prev; } if (!tt) { VALUE desc[3]; desc[0] = tag; desc[1] = value; desc[2] = rb_str_new_cstr("uncaught throw %p"); rb_exc_raise(rb_class_new_instance(numberof(desc), desc, rb_eUncaughtThrow)); } ec->errinfo = (VALUE)THROW_DATA_NEW(tag, NULL, TAG_THROW); EC_JUMP_TAG(ec, TAG_THROW); } void rb_throw(const char *tag, VALUE val) { rb_throw_obj(rb_sym_intern_ascii_cstr(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_. When 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 ? rb_sym_intern_ascii_cstr(tag) : rb_obj_alloc(rb_cObject); return rb_catch_obj(vtag, func, data); } static VALUE vm_catch_protect(VALUE tag, rb_block_call_func *func, VALUE data, enum ruby_tag_type *stateptr, rb_execution_context_t *volatile ec) { enum ruby_tag_type state; VALUE val = Qnil; /* OK */ rb_control_frame_t *volatile saved_cfp = ec->cfp; EC_PUSH_TAG(ec); _tag.tag = tag; if ((state = EC_EXEC_TAG()) == TAG_NONE) { /* 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 && THROW_DATA_VAL((struct vm_throw_data *)ec->errinfo) == tag) { rb_vm_rewind_cfp(ec, saved_cfp); val = ec->tag->retval; ec->errinfo = Qnil; state = 0; } EC_POP_TAG(); if (stateptr) *stateptr = state; return val; } VALUE rb_catch_protect(VALUE t, rb_block_call_func *func, VALUE data, enum ruby_tag_type *stateptr) { return vm_catch_protect(t, func, data, stateptr, GET_EC()); } VALUE rb_catch_obj(VALUE t, VALUE (*func)(), VALUE data) { enum ruby_tag_type state; rb_execution_context_t *ec = GET_EC(); VALUE val = vm_catch_protect(t, (rb_block_call_func *)func, data, &state, ec); if (state) EC_JUMP_TAG(ec, 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_is_local_id(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_execution_context_t *ec = GET_EC(); rb_control_frame_t *cfp = vm_get_ruby_level_caller_cfp(ec, RUBY_VM_PREVIOUS_CONTROL_FRAME(ec->cfp)); unsigned int i; local_var_list_init(&vars); while (cfp) { if (cfp->iseq) { for (i = 0; i < cfp->iseq->body->local_table_size; i++) { local_var_list_add(&vars, cfp->iseq->body->local_table[i]); } } if (!VM_ENV_LOCAL_P(cfp->ep)) { /* block */ const VALUE *ep = VM_CF_PREV_EP(cfp); if (vm_collect_local_variables_in_heap(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 true if yield would execute a * block in the current context. The iterator? 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_execution_context_t *ec = GET_EC(); rb_control_frame_t *cfp = ec->cfp; cfp = vm_get_ruby_level_caller_cfp(ec, RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp)); if (cfp != NULL && VM_CF_BLOCK_HANDLER(cfp) != VM_BLOCK_HANDLER_NONE) { return Qtrue; } else { return Qfalse; } } VALUE rb_current_realfilepath(void) { const rb_execution_context_t *ec = GET_EC(); rb_control_frame_t *cfp = ec->cfp; cfp = vm_get_ruby_level_caller_cfp(ec, RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp)); if (cfp != 0) return rb_iseq_realpath(cfp->iseq); 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, METHOD_VISI_PUBLIC); rb_add_method(rb_mKernel, rb_intern("send"), VM_METHOD_TYPE_OPTIMIZED, (void *)OPTIMIZED_METHOD_TYPE_SEND, METHOD_VISI_PUBLIC); #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); rb_eUncaughtThrow = rb_define_class("UncaughtThrowError", rb_eArgError); rb_define_method(rb_eUncaughtThrow, "initialize", uncaught_throw_init, -1); rb_define_method(rb_eUncaughtThrow, "tag", uncaught_throw_tag, 0); rb_define_method(rb_eUncaughtThrow, "value", uncaught_throw_value, 0); rb_define_method(rb_eUncaughtThrow, "to_s", uncaught_throw_to_s, 0); id_result = rb_intern_const("result"); id_tag = rb_intern_const("tag"); id_value = rb_intern_const("value"); }