summaryrefslogtreecommitdiff
path: root/vm_eval.c
diff options
context:
space:
mode:
Diffstat (limited to 'vm_eval.c')
-rw-r--r--vm_eval.c2638
1 files changed, 1319 insertions, 1319 deletions
diff --git a/vm_eval.c b/vm_eval.c
index 77ecd01380..324e3cadc1 100644
--- a/vm_eval.c
+++ b/vm_eval.c
@@ -1,1319 +1,1319 @@
-/**********************************************************************
-
- vm_eval.c -
-
- $Author: ko1 $
- 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
-
-**********************************************************************/
-
-#include "ruby/ruby.h"
-#include "ruby/node.h"
-#include "ruby/st.h"
-
-#include "vm_method.c"
-
-static inline VALUE method_missing(VALUE obj, ID id, int argc, const VALUE *argv, int call_status);
-static inline VALUE rb_vm_set_finish_env(rb_thread_t * th);
-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_backtrace(rb_thread_t *th, int lev);
-static NODE *vm_cref_push(rb_thread_t *th, VALUE klass, int noex);
-static VALUE vm_eval_body(rb_thread_t *th);
-static void vm_set_eval_stack(rb_thread_t * th, VALUE iseqval, const NODE *cref);
-
-static inline VALUE
-vm_call0(rb_thread_t * th, VALUE klass, VALUE recv, VALUE id, ID oid,
- int argc, const VALUE *argv, const NODE *body, int nosuper)
-{
- VALUE val;
- rb_block_t *blockptr = 0;
-
- if (0) printf("id: %s, nd: %s, argc: %d, passed: %p\n",
- rb_id2name(id), ruby_node_name(nd_type(body)),
- argc, th->passed_block);
-
- if (th->passed_block) {
- blockptr = th->passed_block;
- th->passed_block = 0;
- }
- switch (nd_type(body)) {
- case RUBY_VM_METHOD_NODE:{
- rb_control_frame_t *reg_cfp;
- VALUE iseqval = (VALUE)body->nd_body;
- int i;
-
- rb_vm_set_finish_env(th);
- reg_cfp = th->cfp;
-
- CHECK_STACK_OVERFLOW(reg_cfp, argc + 1);
-
- *reg_cfp->sp++ = recv;
- for (i = 0; i < argc; i++) {
- *reg_cfp->sp++ = argv[i];
- }
-
- vm_setup_method(th, reg_cfp, argc, blockptr, 0, iseqval, recv, klass);
- val = vm_eval_body(th);
- break;
- }
- case NODE_CFUNC: {
- EXEC_EVENT_HOOK(th, RUBY_EVENT_C_CALL, recv, id, klass);
- {
- rb_control_frame_t *reg_cfp = th->cfp;
- rb_control_frame_t *cfp =
- vm_push_frame(th, 0, FRAME_MAGIC_CFUNC,
- recv, (VALUE)blockptr, 0, reg_cfp->sp, 0, 1);
-
- cfp->method_id = id;
- cfp->method_class = klass;
-
- val = call_cfunc(body->nd_cfnc, recv, body->nd_argc, argc, argv);
-
- if (reg_cfp != th->cfp + 1) {
- SDR2(reg_cfp);
- SDR2(th->cfp-5);
- rb_bug("cfp consistency error - call0");
- th->cfp = reg_cfp;
- }
- vm_pop_frame(th);
- }
- EXEC_EVENT_HOOK(th, RUBY_EVENT_C_RETURN, recv, id, klass);
- break;
- }
- case NODE_ATTRSET:{
- if (argc != 1) {
- rb_raise(rb_eArgError, "wrong number of arguments (%d for 1)", argc);
- }
- val = rb_ivar_set(recv, body->nd_vid, argv[0]);
- break;
- }
- case NODE_IVAR: {
- if (argc != 0) {
- rb_raise(rb_eArgError, "wrong number of arguments (%d for 0)",
- argc);
- }
- val = rb_attr_get(recv, body->nd_vid);
- break;
- }
- case NODE_BMETHOD:{
- val = vm_call_bmethod(th, id, body->nd_cval,
- recv, klass, argc, (VALUE *)argv, blockptr);
- break;
- }
- default:
- rb_bug("unsupported: vm_call0(%s)", ruby_node_name(nd_type(body)));
- }
- RUBY_VM_CHECK_INTS();
- return val;
-}
-
-VALUE
-rb_vm_call(rb_thread_t * th, VALUE klass, VALUE recv, VALUE id, ID oid,
- int argc, const VALUE *argv, const NODE *body, int nosuper)
-{
- return vm_call0(th, klass, recv, id, oid, argc, argv, body, nosuper);
-}
-
-static inline VALUE
-vm_call_super(rb_thread_t * const th, const int argc, const VALUE * const argv)
-{
- VALUE recv = th->cfp->self;
- VALUE klass;
- ID id;
- NODE *body;
- rb_control_frame_t *cfp = th->cfp;
-
- if (!cfp->iseq) {
- klass = cfp->method_class;
- klass = RCLASS_SUPER(klass);
-
- if (klass == 0) {
- klass = vm_search_normal_superclass(cfp->method_class, recv);
- }
-
- id = cfp->method_id;
- }
- else {
- rb_bug("vm_call_super: should not be reached");
- }
-
- body = rb_method_node(klass, id); /* this returns NODE_METHOD */
-
- if (body) {
- body = body->nd_body;
- }
- else {
- dp(recv);
- dp(klass);
- dpi(id);
- rb_bug("vm_call_super: not found");
- }
-
- return vm_call0(th, klass, recv, id, id, argc, argv, body, CALL_SUPER);
-}
-
-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 VALUE
-rb_call0(VALUE klass, VALUE recv, ID mid, int argc, const VALUE *argv,
- int scope, VALUE self)
-{
- NODE *body, *method;
- int noex;
- ID id = mid;
- struct cache_entry *ent;
- rb_thread_t *th = GET_THREAD();
-
- if (!klass) {
- rb_raise(rb_eNotImpError,
- "method `%s' called on terminated object (%p)",
- rb_id2name(mid), (void *)recv);
- }
- /* is it in the method cache? */
- ent = cache + EXPR1(klass, mid);
-
- if (ent->mid == mid && ent->klass == klass) {
- if (!ent->method)
- return method_missing(recv, mid, argc, argv,
- scope == 2 ? NOEX_VCALL : 0);
- id = ent->mid0;
- noex = ent->method->nd_noex;
- klass = ent->method->nd_clss;
- body = ent->method->nd_body;
- }
- else if ((method = rb_get_method_body(klass, id, &id)) != 0) {
- noex = method->nd_noex;
- klass = method->nd_clss;
- body = method->nd_body;
- }
- else {
- if (scope == 3) {
- return method_missing(recv, mid, argc, argv, NOEX_SUPER);
- }
- return method_missing(recv, mid, argc, argv,
- scope == 2 ? NOEX_VCALL : 0);
- }
-
-
- if (mid != missing) {
- /* receiver specified form for private method */
- if (UNLIKELY(noex)) {
- if (((noex & NOEX_MASK) & NOEX_PRIVATE) && scope == 0) {
- return method_missing(recv, mid, argc, argv, NOEX_PRIVATE);
- }
-
- /* self must be kind of a specified form for protected method */
- if (((noex & NOEX_MASK) & NOEX_PROTECTED) && scope == 0) {
- VALUE defined_class = klass;
-
- if (TYPE(defined_class) == T_ICLASS) {
- defined_class = RBASIC(defined_class)->klass;
- }
-
- if (self == Qundef) {
- self = th->cfp->self;
- }
- if (!rb_obj_is_kind_of(self, rb_class_real(defined_class))) {
- return method_missing(recv, mid, argc, argv, NOEX_PROTECTED);
- }
- }
-
- if (NOEX_SAFE(noex) > th->safe_level) {
- rb_raise(rb_eSecurityError, "calling insecure method: %s", rb_id2name(mid));
- }
- }
- }
-
- stack_check();
- return vm_call0(th, klass, recv, mid, id, argc, argv, body, noex & NOEX_NOSUPER);
-}
-
-static inline VALUE
-rb_call(VALUE klass, VALUE recv, ID mid, int argc, const VALUE *argv, int scope)
-{
- return rb_call0(klass, recv, mid, argc, argv, scope, Qundef);
-}
-
-/*
- * 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 romanToInt(str)
- * # ...
- * end
- * def method_missing(methId)
- * str = methId.id2name
- * romanToInt(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)
-{
- ID id;
- VALUE exc = rb_eNoMethodError;
- char *format = 0;
- rb_thread_t *th = GET_THREAD();
- int last_call_status = th->method_missing_reason;
- if (argc == 0 || !SYMBOL_P(argv[0])) {
- rb_raise(rb_eArgError, "no id given");
- }
-
- stack_check();
-
- id = SYM2ID(argv[0]);
-
- 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";
- }
- if (!format) {
- format = "undefined method `%s' for %s";
- }
-
- {
- int n = 0;
- VALUE args[3];
- args[n++] = rb_funcall(rb_const_get(exc, rb_intern("message")), '!',
- 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);
- }
- exc = rb_class_new_instance(n, args, exc);
-
- th->cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(th->cfp);
- rb_exc_raise(exc);
- }
-
- return Qnil; /* not reached */
-}
-
-static inline VALUE
-method_missing(VALUE obj, ID id, int argc, const VALUE *argv, int call_status)
-{
- VALUE *nargv;
- GET_THREAD()->method_missing_reason = call_status;
-
- if (id == missing) {
- rb_method_missing(argc, argv, obj);
- }
- else if (id == ID_ALLOCATOR) {
- rb_raise(rb_eTypeError, "allocator undefined for %s",
- rb_class2name(obj));
- }
-
- nargv = ALLOCA_N(VALUE, argc + 1);
- nargv[0] = ID2SYM(id);
- MEMCPY(nargv + 1, argv, VALUE, argc);
-
- return rb_funcall2(obj, missing, argc + 1, nargv);
-}
-
-VALUE
-rb_apply(VALUE recv, ID mid, VALUE args)
-{
- int argc;
- VALUE *argv;
-
- argc = RARRAY_LEN(args); /* Assigns LONG, but argc is INT */
- argv = ALLOCA_N(VALUE, argc);
- MEMCPY(argv, RARRAY_PTR(args), VALUE, argc);
- return rb_call(CLASS_OF(recv), recv, mid, argc, argv, CALL_FCALL);
-}
-
-VALUE
-rb_funcall(VALUE recv, ID mid, int n, ...)
-{
- VALUE *argv;
- va_list ar;
- va_init_list(ar, n);
-
- if (n > 0) {
- long i;
-
- 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(CLASS_OF(recv), recv, mid, n, argv, CALL_FCALL);
-}
-
-VALUE
-rb_funcall2(VALUE recv, ID mid, int argc, const VALUE *argv)
-{
- return rb_call(CLASS_OF(recv), recv, mid, argc, argv, CALL_FCALL);
-}
-
-VALUE
-rb_funcall3(VALUE recv, ID mid, int argc, const VALUE *argv)
-{
- return rb_call(CLASS_OF(recv), recv, mid, argc, argv, CALL_PUBLIC);
-}
-
-static VALUE
-send_internal(int argc, VALUE *argv, VALUE recv, int scope)
-{
- VALUE vid;
- VALUE self = RUBY_VM_PREVIOUS_CONTROL_FRAME(GET_THREAD()->cfp)->self;
-
- if (argc == 0) {
- rb_raise(rb_eArgError, "no method name given");
- }
-
- vid = *argv++; argc--;
- PASS_PASSED_BLOCK();
- return rb_call0(CLASS_OF(recv), recv, rb_to_id(vid), argc, argv, scope, self);
-}
-
-/*
- * call-seq:
- * obj.send(symbol [, args...]) => obj
- * obj.__send__(symbol [, 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_.
- *
- * 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, NOEX_NOSUPER | NOEX_PRIVATE);
-}
-
-/*
- * call-seq:
- * obj.public_send(symbol [, args...]) => obj
- *
- * Invokes the method identified by _symbol_, passing it any
- * arguments specified. Unlike send, public_send calls public
- * methods only.
- *
- * 1.public_send(:puts, "hello") # causes NoMethodError
- */
-
-VALUE
-rb_f_public_send(int argc, VALUE *argv, VALUE recv)
-{
- return send_internal(argc, argv, recv, NOEX_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_LEN(tmp), RARRAY_PTR(tmp));
- return v;
-}
-
-static VALUE
-loop_i(void)
-{
- for (;;) {
- rb_yield_0(0, 0);
- }
- return Qnil;
-}
-
-/*
- * call-seq:
- * loop {|| block }
- *
- * Repeatedly executes the block.
- *
- * 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(void)
-{
- rb_rescue2(loop_i, (VALUE)0, 0, 0, rb_eStopIteration, (VALUE)0);
- return Qnil; /* dummy */
-}
-
-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 *cfp = th->cfp;
-
- TH_PUSH_TAG(th);
- state = TH_EXEC_TAG();
- if (state == 0) {
- iter_retry:
- {
- rb_block_t *blockptr = RUBY_VM_GET_BLOCK_PTR_IN_CFP(th->cfp);
- blockptr->iseq = (void *)node;
- blockptr->proc = 0;
- th->passed_block = blockptr;
- }
- retval = (*it_proc) (data1);
- }
- else {
- VALUE err = th->errinfo;
- if (state == TAG_BREAK) {
- VALUE *escape_dfp = GET_THROWOBJ_CATCH_POINT(err);
- VALUE *cdfp = cfp->dfp;
-
- if (cdfp == escape_dfp) {
- state = 0;
- th->state = 0;
- th->errinfo = Qnil;
- th->cfp = cfp;
- }
- else{
- /* SDR(); printf("%p, %p\n", cdfp, escape_dfp); */
- }
- }
- else if (state == TAG_RETRY) {
- VALUE *escape_dfp = GET_THROWOBJ_CATCH_POINT(err);
- VALUE *cdfp = cfp->dfp;
-
- if (cdfp == escape_dfp) {
- state = 0;
- th->state = 0;
- th->errinfo = Qnil;
- th->cfp = cfp;
- 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;
- VALUE *argv;
-};
-
-static VALUE
-iterate_method(VALUE obj)
-{
- const struct iter_method_arg * arg =
- (struct iter_method_arg *) obj;
-
- return rb_call(CLASS_OF(arg->obj), arg->obj, arg->mid,
- arg->argc, arg->argv, CALL_FCALL);
-}
-
-VALUE
-rb_block_call(VALUE obj, ID mid, int argc, 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_each(VALUE obj)
-{
- return rb_call(CLASS_OF(obj), obj, idEach, 0, 0, CALL_FCALL);
-}
-
-static VALUE
-eval_string_with_cref(VALUE self, VALUE src, VALUE scope, NODE *cref, const char *file, int line)
-{
- int state;
- VALUE result = Qundef;
- VALUE envval;
- rb_binding_t *bind = 0;
- rb_thread_t *th = GET_THREAD();
- rb_env_t *env = NULL;
- rb_block_t block;
-
- if (file == 0) {
- file = rb_sourcefile();
- line = rb_sourceline();
- }
-
- PUSH_TAG();
- if ((state = EXEC_TAG()) == 0) {
- rb_iseq_t *iseq;
- volatile VALUE iseqval;
-
- if (scope != Qnil) {
- if (rb_obj_is_kind_of(scope, rb_cBinding)) {
- GetBindingPtr(scope, bind);
- envval = bind->env;
- }
- else {
- rb_raise(rb_eTypeError,
- "wrong argument type %s (expected Binding)",
- rb_obj_classname(scope));
- }
- GetEnvPtr(envval, env);
- th->base_block = &env->block;
- }
- else {
- rb_control_frame_t *cfp = vm_get_ruby_level_cfp(th, th->cfp);
- block = *RUBY_VM_GET_BLOCK_PTR_IN_CFP(cfp);
- th->base_block = &block;
- th->base_block->self = self;
- th->base_block->iseq = cfp->iseq; /* TODO */
- }
-
- /* make eval iseq */
- th->parse_in_eval++;
- iseqval = rb_iseq_compile(src, rb_str_new2(file), INT2FIX(line));
- th->parse_in_eval--;
-
- vm_set_eval_stack(th, iseqval, cref);
- th->base_block = 0;
-
- if (0) { /* for debug */
- extern VALUE ruby_iseq_disasm(VALUE);
- printf("%s\n", RSTRING_PTR(ruby_iseq_disasm(iseqval)));
- }
-
- /* save new env */
- GetISeqPtr(iseqval, iseq);
- if (bind && iseq->local_size > 0) {
- bind->env = vm_make_env_object(th, th->cfp);
- }
-
- /* kick */
- CHECK_STACK_OVERFLOW(th->cfp, iseq->stack_max);
- result = vm_eval_body(th);
- }
- POP_TAG();
-
- if (state) {
- if (state == TAG_RAISE) {
- VALUE errinfo = th->errinfo;
- if (strcmp(file, "(eval)") == 0) {
- VALUE mesg, errat, bt2;
- extern VALUE rb_get_backtrace(VALUE info);
-
- errat = rb_get_backtrace(errinfo);
- mesg = rb_attr_get(errinfo, rb_intern("mesg"));
- if (!NIL_P(errat) && TYPE(errat) == T_ARRAY &&
- (bt2 = vm_backtrace(th, -2), RARRAY_LEN(bt2) > 0)) {
- if (!NIL_P(mesg) && TYPE(mesg) == T_STRING && !RSTRING_LEN(mesg)) {
- rb_str_update(mesg, 0, 0, rb_str_new2(": "));
- rb_str_update(mesg, 0, 0, RARRAY_PTR(errat)[0]);
- }
- RARRAY_PTR(errat)[0] = RARRAY_PTR(bt2)[0];
- }
- }
- rb_exc_raise(errinfo);
- }
- JUMP_TAG(state);
- }
- return result;
-}
-
-static VALUE
-eval_string(VALUE self, VALUE src, VALUE scope, const char *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, the evaluation is performed in its
- * context. The binding may be a <code>Binding</code> object or a
- * <code>Proc</code> object. If the optional <em>filename</em> and
- * <em>lineno</em> parameters are present, they will be used when
- * reporting syntax errors.
- *
- * def getBinding(str)
- * return binding
- * end
- * str = "hello"
- * eval "str + ' Fred'" #=> "hello Fred"
- * eval "str + ' Fred'", getBinding("bye") #=> "bye Fred"
- */
-
-VALUE
-rb_f_eval(int argc, VALUE *argv, VALUE self)
-{
- VALUE src, scope, vfile, vline;
- char *file = "(eval)";
- int line = 1;
-
- rb_scan_args(argc, argv, "13", &src, &scope, &vfile, &vline);
- if (rb_safe_level() >= 4) {
- StringValue(src);
- if (!NIL_P(scope) && !OBJ_TAINTED(scope)) {
- rb_raise(rb_eSecurityError,
- "Insecure: can't modify trusted binding");
- }
- }
- else {
- SafeStringValue(src);
- }
- if (argc >= 3) {
- StringValue(vfile);
- }
- if (argc >= 4) {
- line = NUM2INT(vline);
- }
-
- if (!NIL_P(vfile))
- file = RSTRING_PTR(vfile);
- return eval_string(self, src, scope, file, line);
-}
-
-VALUE
-rb_eval_string(const char *str)
-{
- return eval_string(rb_vm_top_self(), rb_str_new2(str), Qnil, "(eval)", 1);
-}
-
-VALUE
-rb_eval_string_protect(const char *str, int *state)
-{
- return rb_protect((VALUE (*)(VALUE))rb_eval_string, (VALUE)str, state);
-}
-
-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;
- VALUE val = Qnil; /* OK */
- volatile int safe = rb_safe_level();
-
- if (OBJ_TAINTED(cmd)) {
- level = 4;
- }
-
- if (TYPE(cmd) != T_STRING) {
- PUSH_TAG();
- rb_set_safe_level_force(level);
- if ((state = EXEC_TAG()) == 0) {
- val = rb_funcall2(cmd, rb_intern("call"), RARRAY_LEN(arg),
- RARRAY_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) vm_jump_tag_but_local_jump(state, val);
- 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 = vm_cref_push(th, under, NOEX_PUBLIC);
-
- if ((blockptr = GC_GUARDED_PTR_REF(th->cfp->lfp[0])) != 0) {
- block = *blockptr;
- block.self = self;
- th->cfp->lfp[0] = GC_GUARDED_PTR(&block);
- }
-
- if (values == Qundef) {
- return vm_yield_with_cref(th, 0, 0, cref);
- }
- else {
- return vm_yield_with_cref(th, RARRAY_LEN(values), RARRAY_PTR(values), cref);
- }
-}
-
-/* string eval under the class/module context */
-static VALUE
-eval_under(VALUE under, VALUE self, VALUE src, const char *file, int line)
-{
- NODE *cref = vm_cref_push(GET_THREAD(), under, NOEX_PUBLIC);
-
- if (rb_safe_level() >= 4) {
- StringValue(src);
- }
- else {
- SafeStringValue(src);
- }
-
- return eval_string_with_cref(self, src, Qnil, cref, file, line);
-}
-
-static VALUE
-specific_eval(int argc, VALUE *argv, VALUE klass, VALUE self)
-{
- if (rb_block_given_p()) {
- if (argc > 0) {
- rb_raise(rb_eArgError, "wrong number of arguments (%d for 0)", argc);
- }
- return yield_under(klass, self, Qundef);
- }
- else {
- char *file = "(eval)";
- int line = 1;
-
- if (argc == 0) {
- rb_raise(rb_eArgError, "block not supplied");
- }
- else {
- if (rb_safe_level() >= 4) {
- StringValue(argv[0]);
- }
- else {
- SafeStringValue(argv[0]);
- }
- if (argc > 3) {
- const char *name = rb_id2name(rb_frame_callee());
- rb_raise(rb_eArgError,
- "wrong number of arguments: %s(src) or %s{..}",
- name, name);
- }
- if (argc > 2)
- line = NUM2INT(argv[2]);
- if (argc > 1) {
- file = StringValuePtr(argv[1]);
- }
- }
- return eval_under(klass, self, argv[0], file, line);
- }
-}
-
-/*
- * call-seq:
- * obj.instance_eval(string [, filename [, lineno]] ) => obj
- * obj.instance_eval {| | 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. In the version of <code>instance_eval</code>
- * that takes 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
- * end
- * k = KlassWithSecret.new
- * k.instance_eval { @secret } #=> 99
- */
-
-VALUE
-rb_obj_instance_eval(int argc, VALUE *argv, VALUE self)
-{
- VALUE klass;
-
- if (SPECIAL_CONST_P(self)) {
- klass = Qnil;
- }
- 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, VALUE *argv, VALUE self)
-{
- VALUE klass;
-
- if (SPECIAL_CONST_P(self)) {
- klass = Qnil;
- }
- 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_. 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, 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.
- *
- * 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, VALUE *argv, VALUE mod)
-{
- return yield_under(mod, mod, rb_ary_new4(argc, argv));
-}
-
-NORETURN(static VALUE rb_f_throw _((int, VALUE *)));
-
-/*
- * call-seq:
- * throw(symbol [, obj])
- *
- * Transfers control to the end of the active +catch+ block
- * waiting for _symbol_. Raises +NameError+ if there
- * is no +catch+ block for the symbol. 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_thread_t *th = GET_THREAD();
- struct rb_vm_tag *tt = th->tag;
-
- rb_scan_args(argc, argv, "11", &tag, &value);
- 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 %s", RSTRING_PTR(desc));
- }
- rb_trap_restore_mask();
- th->errinfo = NEW_THROW_OBJECT(tag, 0, TAG_THROW);
-
- JUMP_TAG(TAG_THROW);
-#ifndef __GNUC__
- return Qnil; /* not reached */
-#endif
-}
-
-void
-rb_throw(const char *tag, VALUE val)
-{
- VALUE argv[2];
-
- argv[0] = ID2SYM(rb_intern(tag));
- argv[1] = val;
- rb_f_throw(2, argv);
-}
-
-void
-rb_throw_obj(VALUE tag, VALUE val)
-{
- VALUE argv[2];
-
- argv[0] = tag;
- argv[1] = val;
- rb_f_throw(2, argv);
-}
-
-/*
- * call-seq:
- * catch(symbol) {| | block } > obj
- *
- * +catch+ executes its block. If a +throw+ is
- * executed, Ruby searches up its stack for a +catch+ block
- * with a tag corresponding to the +throw+'s
- * _symbol_. If found, that block is terminated, and
- * +catch+ returns the value given to +throw+. If
- * +throw+ is not called, the block terminates normally, and
- * the value of +catch+ is the value of the last expression
- * evaluated. +catch+ expressions may be nested, and the
- * +throw+ call need not be in lexical scope.
- *
- * def routine(n)
- * puts n
- * throw :done if n <= 0
- * routine(n-1)
- * end
- *
- *
- * catch(:done) { routine(3) }
- *
- * <em>produces:</em>
- *
- * 3
- * 2
- * 1
- * 0
- */
-
-static VALUE
-rb_f_catch(int argc, VALUE *argv)
-{
- VALUE tag;
- int state;
- VALUE val = Qnil; /* OK */
- rb_thread_t *th = GET_THREAD();
- rb_control_frame_t *saved_cfp = th->cfp;
-
- if (argc == 0) {
- tag = rb_obj_alloc(rb_cObject);
- }
- else {
- rb_scan_args(argc, argv, "01", &tag);
- }
- PUSH_TAG();
-
- th->tag->tag = tag;
-
- if ((state = EXEC_TAG()) == 0) {
- val = rb_yield_0(1, &tag);
- }
- else if (state == TAG_THROW && RNODE(th->errinfo)->u1.value == tag) {
- th->cfp = saved_cfp;
- val = th->tag->retval;
- th->errinfo = Qnil;
- state = 0;
- }
- POP_TAG();
- if (state)
- JUMP_TAG(state);
-
- return val;
-}
-
-static VALUE
-catch_null_i(VALUE dmy)
-{
- return rb_funcall(Qnil, rb_intern("catch"), 0, 0);
-}
-
-static VALUE
-catch_i(VALUE tag)
-{
- return rb_funcall(Qnil, rb_intern("catch"), 1, tag);
-}
-
-VALUE
-rb_catch(const char *tag, VALUE (*func)(), VALUE data)
-{
- if (!tag) {
- return rb_iterate(catch_null_i, 0, func, data);
- }
- return rb_iterate(catch_i, ID2SYM(rb_intern(tag)), func, data);
-}
-
-VALUE
-rb_catch_obj(VALUE tag, VALUE (*func)(), VALUE data)
-{
- return rb_iterate((VALUE (*)_((VALUE)))catch_i, tag, func, data);
-}
-
-/*
- * call-seq:
- * caller(start=1) => array
- *
- * Returns the current execution stack---an array containing strings in
- * the form ``<em>file:line</em>'' or ``<em>file:line: in
- * `method'</em>''. The optional _start_ parameter
- * determines the number of initial stack entries to omit from the
- * result.
- *
- * def a(skip)
- * caller(skip)
- * end
- * def b(skip)
- * a(skip)
- * end
- * def c(skip)
- * b(skip)
- * end
- * c(0) #=> ["prog:2:in `a'", "prog:5:in `b'", "prog:8:in `c'", "prog:10"]
- * c(1) #=> ["prog:5:in `b'", "prog:8:in `c'", "prog:11"]
- * c(2) #=> ["prog:8:in `c'", "prog:12"]
- * c(3) #=> ["prog:13"]
- */
-
-static VALUE
-rb_f_caller(int argc, VALUE *argv)
-{
- VALUE level;
- int lev;
-
- rb_scan_args(argc, argv, "01", &level);
-
- if (NIL_P(level))
- lev = 1;
- else
- lev = NUM2INT(level);
- if (lev < 0)
- rb_raise(rb_eArgError, "negative level (%d)", lev);
-
- return vm_backtrace(GET_THREAD(), lev);
-}
-
-void
-rb_backtrace(void)
-{
- long i;
- VALUE ary;
-
- ary = vm_backtrace(GET_THREAD(), -1);
- for (i = 0; i < RARRAY_LEN(ary); i++) {
- printf("\tfrom %s\n", RSTRING_PTR(RARRAY_PTR(ary)[i]));
- }
-}
-
-VALUE
-rb_make_backtrace(void)
-{
- return vm_backtrace(GET_THREAD(), -1);
-}
-
-void
-Init_vm_eval(void)
-{
- 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);
-
- rb_define_method(rb_cBasicObject, "__send__", rb_f_send, -1);
- rb_define_method(rb_mKernel, "send", rb_f_send, -1);
- 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_global_function("caller", rb_f_caller, -1);
-}
-
+/**********************************************************************
+
+ 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
+
+**********************************************************************/
+
+#include "ruby/ruby.h"
+#include "ruby/node.h"
+#include "ruby/st.h"
+
+#include "vm_method.c"
+
+static inline VALUE method_missing(VALUE obj, ID id, int argc, const VALUE *argv, int call_status);
+static inline VALUE rb_vm_set_finish_env(rb_thread_t * th);
+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_backtrace(rb_thread_t *th, int lev);
+static NODE *vm_cref_push(rb_thread_t *th, VALUE klass, int noex);
+static VALUE vm_eval_body(rb_thread_t *th);
+static void vm_set_eval_stack(rb_thread_t * th, VALUE iseqval, const NODE *cref);
+
+static inline VALUE
+vm_call0(rb_thread_t * th, VALUE klass, VALUE recv, VALUE id, ID oid,
+ int argc, const VALUE *argv, const NODE *body, int nosuper)
+{
+ VALUE val;
+ rb_block_t *blockptr = 0;
+
+ if (0) printf("id: %s, nd: %s, argc: %d, passed: %p\n",
+ rb_id2name(id), ruby_node_name(nd_type(body)),
+ argc, th->passed_block);
+
+ if (th->passed_block) {
+ blockptr = th->passed_block;
+ th->passed_block = 0;
+ }
+ switch (nd_type(body)) {
+ case RUBY_VM_METHOD_NODE:{
+ rb_control_frame_t *reg_cfp;
+ VALUE iseqval = (VALUE)body->nd_body;
+ int i;
+
+ rb_vm_set_finish_env(th);
+ reg_cfp = th->cfp;
+
+ CHECK_STACK_OVERFLOW(reg_cfp, argc + 1);
+
+ *reg_cfp->sp++ = recv;
+ for (i = 0; i < argc; i++) {
+ *reg_cfp->sp++ = argv[i];
+ }
+
+ vm_setup_method(th, reg_cfp, argc, blockptr, 0, iseqval, recv, klass);
+ val = vm_eval_body(th);
+ break;
+ }
+ case NODE_CFUNC: {
+ EXEC_EVENT_HOOK(th, RUBY_EVENT_C_CALL, recv, id, klass);
+ {
+ rb_control_frame_t *reg_cfp = th->cfp;
+ rb_control_frame_t *cfp =
+ vm_push_frame(th, 0, FRAME_MAGIC_CFUNC,
+ recv, (VALUE)blockptr, 0, reg_cfp->sp, 0, 1);
+
+ cfp->method_id = id;
+ cfp->method_class = klass;
+
+ val = call_cfunc(body->nd_cfnc, recv, body->nd_argc, argc, argv);
+
+ if (reg_cfp != th->cfp + 1) {
+ SDR2(reg_cfp);
+ SDR2(th->cfp-5);
+ rb_bug("cfp consistency error - call0");
+ th->cfp = reg_cfp;
+ }
+ vm_pop_frame(th);
+ }
+ EXEC_EVENT_HOOK(th, RUBY_EVENT_C_RETURN, recv, id, klass);
+ break;
+ }
+ case NODE_ATTRSET:{
+ if (argc != 1) {
+ rb_raise(rb_eArgError, "wrong number of arguments (%d for 1)", argc);
+ }
+ val = rb_ivar_set(recv, body->nd_vid, argv[0]);
+ break;
+ }
+ case NODE_IVAR: {
+ if (argc != 0) {
+ rb_raise(rb_eArgError, "wrong number of arguments (%d for 0)",
+ argc);
+ }
+ val = rb_attr_get(recv, body->nd_vid);
+ break;
+ }
+ case NODE_BMETHOD:{
+ val = vm_call_bmethod(th, id, body->nd_cval,
+ recv, klass, argc, (VALUE *)argv, blockptr);
+ break;
+ }
+ default:
+ rb_bug("unsupported: vm_call0(%s)", ruby_node_name(nd_type(body)));
+ }
+ RUBY_VM_CHECK_INTS();
+ return val;
+}
+
+VALUE
+rb_vm_call(rb_thread_t * th, VALUE klass, VALUE recv, VALUE id, ID oid,
+ int argc, const VALUE *argv, const NODE *body, int nosuper)
+{
+ return vm_call0(th, klass, recv, id, oid, argc, argv, body, nosuper);
+}
+
+static inline VALUE
+vm_call_super(rb_thread_t * const th, const int argc, const VALUE * const argv)
+{
+ VALUE recv = th->cfp->self;
+ VALUE klass;
+ ID id;
+ NODE *body;
+ rb_control_frame_t *cfp = th->cfp;
+
+ if (!cfp->iseq) {
+ klass = cfp->method_class;
+ klass = RCLASS_SUPER(klass);
+
+ if (klass == 0) {
+ klass = vm_search_normal_superclass(cfp->method_class, recv);
+ }
+
+ id = cfp->method_id;
+ }
+ else {
+ rb_bug("vm_call_super: should not be reached");
+ }
+
+ body = rb_method_node(klass, id); /* this returns NODE_METHOD */
+
+ if (body) {
+ body = body->nd_body;
+ }
+ else {
+ dp(recv);
+ dp(klass);
+ dpi(id);
+ rb_bug("vm_call_super: not found");
+ }
+
+ return vm_call0(th, klass, recv, id, id, argc, argv, body, CALL_SUPER);
+}
+
+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 VALUE
+rb_call0(VALUE klass, VALUE recv, ID mid, int argc, const VALUE *argv,
+ int scope, VALUE self)
+{
+ NODE *body, *method;
+ int noex;
+ ID id = mid;
+ struct cache_entry *ent;
+ rb_thread_t *th = GET_THREAD();
+
+ if (!klass) {
+ rb_raise(rb_eNotImpError,
+ "method `%s' called on terminated object (%p)",
+ rb_id2name(mid), (void *)recv);
+ }
+ /* is it in the method cache? */
+ ent = cache + EXPR1(klass, mid);
+
+ if (ent->mid == mid && ent->klass == klass) {
+ if (!ent->method)
+ return method_missing(recv, mid, argc, argv,
+ scope == 2 ? NOEX_VCALL : 0);
+ id = ent->mid0;
+ noex = ent->method->nd_noex;
+ klass = ent->method->nd_clss;
+ body = ent->method->nd_body;
+ }
+ else if ((method = rb_get_method_body(klass, id, &id)) != 0) {
+ noex = method->nd_noex;
+ klass = method->nd_clss;
+ body = method->nd_body;
+ }
+ else {
+ if (scope == 3) {
+ return method_missing(recv, mid, argc, argv, NOEX_SUPER);
+ }
+ return method_missing(recv, mid, argc, argv,
+ scope == 2 ? NOEX_VCALL : 0);
+ }
+
+
+ if (mid != missing) {
+ /* receiver specified form for private method */
+ if (UNLIKELY(noex)) {
+ if (((noex & NOEX_MASK) & NOEX_PRIVATE) && scope == 0) {
+ return method_missing(recv, mid, argc, argv, NOEX_PRIVATE);
+ }
+
+ /* self must be kind of a specified form for protected method */
+ if (((noex & NOEX_MASK) & NOEX_PROTECTED) && scope == 0) {
+ VALUE defined_class = klass;
+
+ if (TYPE(defined_class) == T_ICLASS) {
+ defined_class = RBASIC(defined_class)->klass;
+ }
+
+ if (self == Qundef) {
+ self = th->cfp->self;
+ }
+ if (!rb_obj_is_kind_of(self, rb_class_real(defined_class))) {
+ return method_missing(recv, mid, argc, argv, NOEX_PROTECTED);
+ }
+ }
+
+ if (NOEX_SAFE(noex) > th->safe_level) {
+ rb_raise(rb_eSecurityError, "calling insecure method: %s", rb_id2name(mid));
+ }
+ }
+ }
+
+ stack_check();
+ return vm_call0(th, klass, recv, mid, id, argc, argv, body, noex & NOEX_NOSUPER);
+}
+
+static inline VALUE
+rb_call(VALUE klass, VALUE recv, ID mid, int argc, const VALUE *argv, int scope)
+{
+ return rb_call0(klass, recv, mid, argc, argv, scope, Qundef);
+}
+
+/*
+ * 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 romanToInt(str)
+ * # ...
+ * end
+ * def method_missing(methId)
+ * str = methId.id2name
+ * romanToInt(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)
+{
+ ID id;
+ VALUE exc = rb_eNoMethodError;
+ char *format = 0;
+ rb_thread_t *th = GET_THREAD();
+ int last_call_status = th->method_missing_reason;
+ if (argc == 0 || !SYMBOL_P(argv[0])) {
+ rb_raise(rb_eArgError, "no id given");
+ }
+
+ stack_check();
+
+ id = SYM2ID(argv[0]);
+
+ 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";
+ }
+ if (!format) {
+ format = "undefined method `%s' for %s";
+ }
+
+ {
+ int n = 0;
+ VALUE args[3];
+ args[n++] = rb_funcall(rb_const_get(exc, rb_intern("message")), '!',
+ 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);
+ }
+ exc = rb_class_new_instance(n, args, exc);
+
+ th->cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(th->cfp);
+ rb_exc_raise(exc);
+ }
+
+ return Qnil; /* not reached */
+}
+
+static inline VALUE
+method_missing(VALUE obj, ID id, int argc, const VALUE *argv, int call_status)
+{
+ VALUE *nargv;
+ GET_THREAD()->method_missing_reason = call_status;
+
+ if (id == missing) {
+ rb_method_missing(argc, argv, obj);
+ }
+ else if (id == ID_ALLOCATOR) {
+ rb_raise(rb_eTypeError, "allocator undefined for %s",
+ rb_class2name(obj));
+ }
+
+ nargv = ALLOCA_N(VALUE, argc + 1);
+ nargv[0] = ID2SYM(id);
+ MEMCPY(nargv + 1, argv, VALUE, argc);
+
+ return rb_funcall2(obj, missing, argc + 1, nargv);
+}
+
+VALUE
+rb_apply(VALUE recv, ID mid, VALUE args)
+{
+ int argc;
+ VALUE *argv;
+
+ argc = RARRAY_LEN(args); /* Assigns LONG, but argc is INT */
+ argv = ALLOCA_N(VALUE, argc);
+ MEMCPY(argv, RARRAY_PTR(args), VALUE, argc);
+ return rb_call(CLASS_OF(recv), recv, mid, argc, argv, CALL_FCALL);
+}
+
+VALUE
+rb_funcall(VALUE recv, ID mid, int n, ...)
+{
+ VALUE *argv;
+ va_list ar;
+ va_init_list(ar, n);
+
+ if (n > 0) {
+ long i;
+
+ 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(CLASS_OF(recv), recv, mid, n, argv, CALL_FCALL);
+}
+
+VALUE
+rb_funcall2(VALUE recv, ID mid, int argc, const VALUE *argv)
+{
+ return rb_call(CLASS_OF(recv), recv, mid, argc, argv, CALL_FCALL);
+}
+
+VALUE
+rb_funcall3(VALUE recv, ID mid, int argc, const VALUE *argv)
+{
+ return rb_call(CLASS_OF(recv), recv, mid, argc, argv, CALL_PUBLIC);
+}
+
+static VALUE
+send_internal(int argc, VALUE *argv, VALUE recv, int scope)
+{
+ VALUE vid;
+ VALUE self = RUBY_VM_PREVIOUS_CONTROL_FRAME(GET_THREAD()->cfp)->self;
+
+ if (argc == 0) {
+ rb_raise(rb_eArgError, "no method name given");
+ }
+
+ vid = *argv++; argc--;
+ PASS_PASSED_BLOCK();
+ return rb_call0(CLASS_OF(recv), recv, rb_to_id(vid), argc, argv, scope, self);
+}
+
+/*
+ * call-seq:
+ * obj.send(symbol [, args...]) => obj
+ * obj.__send__(symbol [, 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_.
+ *
+ * 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, NOEX_NOSUPER | NOEX_PRIVATE);
+}
+
+/*
+ * call-seq:
+ * obj.public_send(symbol [, args...]) => obj
+ *
+ * Invokes the method identified by _symbol_, passing it any
+ * arguments specified. Unlike send, public_send calls public
+ * methods only.
+ *
+ * 1.public_send(:puts, "hello") # causes NoMethodError
+ */
+
+VALUE
+rb_f_public_send(int argc, VALUE *argv, VALUE recv)
+{
+ return send_internal(argc, argv, recv, NOEX_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_LEN(tmp), RARRAY_PTR(tmp));
+ return v;
+}
+
+static VALUE
+loop_i(void)
+{
+ for (;;) {
+ rb_yield_0(0, 0);
+ }
+ return Qnil;
+}
+
+/*
+ * call-seq:
+ * loop {|| block }
+ *
+ * Repeatedly executes the block.
+ *
+ * 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(void)
+{
+ rb_rescue2(loop_i, (VALUE)0, 0, 0, rb_eStopIteration, (VALUE)0);
+ return Qnil; /* dummy */
+}
+
+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 *cfp = th->cfp;
+
+ TH_PUSH_TAG(th);
+ state = TH_EXEC_TAG();
+ if (state == 0) {
+ iter_retry:
+ {
+ rb_block_t *blockptr = RUBY_VM_GET_BLOCK_PTR_IN_CFP(th->cfp);
+ blockptr->iseq = (void *)node;
+ blockptr->proc = 0;
+ th->passed_block = blockptr;
+ }
+ retval = (*it_proc) (data1);
+ }
+ else {
+ VALUE err = th->errinfo;
+ if (state == TAG_BREAK) {
+ VALUE *escape_dfp = GET_THROWOBJ_CATCH_POINT(err);
+ VALUE *cdfp = cfp->dfp;
+
+ if (cdfp == escape_dfp) {
+ state = 0;
+ th->state = 0;
+ th->errinfo = Qnil;
+ th->cfp = cfp;
+ }
+ else{
+ /* SDR(); printf("%p, %p\n", cdfp, escape_dfp); */
+ }
+ }
+ else if (state == TAG_RETRY) {
+ VALUE *escape_dfp = GET_THROWOBJ_CATCH_POINT(err);
+ VALUE *cdfp = cfp->dfp;
+
+ if (cdfp == escape_dfp) {
+ state = 0;
+ th->state = 0;
+ th->errinfo = Qnil;
+ th->cfp = cfp;
+ 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;
+ VALUE *argv;
+};
+
+static VALUE
+iterate_method(VALUE obj)
+{
+ const struct iter_method_arg * arg =
+ (struct iter_method_arg *) obj;
+
+ return rb_call(CLASS_OF(arg->obj), arg->obj, arg->mid,
+ arg->argc, arg->argv, CALL_FCALL);
+}
+
+VALUE
+rb_block_call(VALUE obj, ID mid, int argc, 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_each(VALUE obj)
+{
+ return rb_call(CLASS_OF(obj), obj, idEach, 0, 0, CALL_FCALL);
+}
+
+static VALUE
+eval_string_with_cref(VALUE self, VALUE src, VALUE scope, NODE *cref, const char *file, int line)
+{
+ int state;
+ VALUE result = Qundef;
+ VALUE envval;
+ rb_binding_t *bind = 0;
+ rb_thread_t *th = GET_THREAD();
+ rb_env_t *env = NULL;
+ rb_block_t block;
+
+ if (file == 0) {
+ file = rb_sourcefile();
+ line = rb_sourceline();
+ }
+
+ PUSH_TAG();
+ if ((state = EXEC_TAG()) == 0) {
+ rb_iseq_t *iseq;
+ volatile VALUE iseqval;
+
+ if (scope != Qnil) {
+ if (rb_obj_is_kind_of(scope, rb_cBinding)) {
+ GetBindingPtr(scope, bind);
+ envval = bind->env;
+ }
+ else {
+ rb_raise(rb_eTypeError,
+ "wrong argument type %s (expected Binding)",
+ rb_obj_classname(scope));
+ }
+ GetEnvPtr(envval, env);
+ th->base_block = &env->block;
+ }
+ else {
+ rb_control_frame_t *cfp = vm_get_ruby_level_cfp(th, th->cfp);
+ block = *RUBY_VM_GET_BLOCK_PTR_IN_CFP(cfp);
+ th->base_block = &block;
+ th->base_block->self = self;
+ th->base_block->iseq = cfp->iseq; /* TODO */
+ }
+
+ /* make eval iseq */
+ th->parse_in_eval++;
+ iseqval = rb_iseq_compile(src, rb_str_new2(file), INT2FIX(line));
+ th->parse_in_eval--;
+
+ vm_set_eval_stack(th, iseqval, cref);
+ th->base_block = 0;
+
+ if (0) { /* for debug */
+ extern VALUE ruby_iseq_disasm(VALUE);
+ printf("%s\n", RSTRING_PTR(ruby_iseq_disasm(iseqval)));
+ }
+
+ /* save new env */
+ GetISeqPtr(iseqval, iseq);
+ if (bind && iseq->local_size > 0) {
+ bind->env = vm_make_env_object(th, th->cfp);
+ }
+
+ /* kick */
+ CHECK_STACK_OVERFLOW(th->cfp, iseq->stack_max);
+ result = vm_eval_body(th);
+ }
+ POP_TAG();
+
+ if (state) {
+ if (state == TAG_RAISE) {
+ VALUE errinfo = th->errinfo;
+ if (strcmp(file, "(eval)") == 0) {
+ VALUE mesg, errat, bt2;
+ extern VALUE rb_get_backtrace(VALUE info);
+
+ errat = rb_get_backtrace(errinfo);
+ mesg = rb_attr_get(errinfo, rb_intern("mesg"));
+ if (!NIL_P(errat) && TYPE(errat) == T_ARRAY &&
+ (bt2 = vm_backtrace(th, -2), RARRAY_LEN(bt2) > 0)) {
+ if (!NIL_P(mesg) && TYPE(mesg) == T_STRING && !RSTRING_LEN(mesg)) {
+ rb_str_update(mesg, 0, 0, rb_str_new2(": "));
+ rb_str_update(mesg, 0, 0, RARRAY_PTR(errat)[0]);
+ }
+ RARRAY_PTR(errat)[0] = RARRAY_PTR(bt2)[0];
+ }
+ }
+ rb_exc_raise(errinfo);
+ }
+ JUMP_TAG(state);
+ }
+ return result;
+}
+
+static VALUE
+eval_string(VALUE self, VALUE src, VALUE scope, const char *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, the evaluation is performed in its
+ * context. The binding may be a <code>Binding</code> object or a
+ * <code>Proc</code> object. If the optional <em>filename</em> and
+ * <em>lineno</em> parameters are present, they will be used when
+ * reporting syntax errors.
+ *
+ * def getBinding(str)
+ * return binding
+ * end
+ * str = "hello"
+ * eval "str + ' Fred'" #=> "hello Fred"
+ * eval "str + ' Fred'", getBinding("bye") #=> "bye Fred"
+ */
+
+VALUE
+rb_f_eval(int argc, VALUE *argv, VALUE self)
+{
+ VALUE src, scope, vfile, vline;
+ char *file = "(eval)";
+ int line = 1;
+
+ rb_scan_args(argc, argv, "13", &src, &scope, &vfile, &vline);
+ if (rb_safe_level() >= 4) {
+ StringValue(src);
+ if (!NIL_P(scope) && !OBJ_TAINTED(scope)) {
+ rb_raise(rb_eSecurityError,
+ "Insecure: can't modify trusted binding");
+ }
+ }
+ else {
+ SafeStringValue(src);
+ }
+ if (argc >= 3) {
+ StringValue(vfile);
+ }
+ if (argc >= 4) {
+ line = NUM2INT(vline);
+ }
+
+ if (!NIL_P(vfile))
+ file = RSTRING_PTR(vfile);
+ return eval_string(self, src, scope, file, line);
+}
+
+VALUE
+rb_eval_string(const char *str)
+{
+ return eval_string(rb_vm_top_self(), rb_str_new2(str), Qnil, "(eval)", 1);
+}
+
+VALUE
+rb_eval_string_protect(const char *str, int *state)
+{
+ return rb_protect((VALUE (*)(VALUE))rb_eval_string, (VALUE)str, state);
+}
+
+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;
+ VALUE val = Qnil; /* OK */
+ volatile int safe = rb_safe_level();
+
+ if (OBJ_TAINTED(cmd)) {
+ level = 4;
+ }
+
+ if (TYPE(cmd) != T_STRING) {
+ PUSH_TAG();
+ rb_set_safe_level_force(level);
+ if ((state = EXEC_TAG()) == 0) {
+ val = rb_funcall2(cmd, rb_intern("call"), RARRAY_LEN(arg),
+ RARRAY_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) vm_jump_tag_but_local_jump(state, val);
+ 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 = vm_cref_push(th, under, NOEX_PUBLIC);
+
+ if ((blockptr = GC_GUARDED_PTR_REF(th->cfp->lfp[0])) != 0) {
+ block = *blockptr;
+ block.self = self;
+ th->cfp->lfp[0] = GC_GUARDED_PTR(&block);
+ }
+
+ if (values == Qundef) {
+ return vm_yield_with_cref(th, 0, 0, cref);
+ }
+ else {
+ return vm_yield_with_cref(th, RARRAY_LEN(values), RARRAY_PTR(values), cref);
+ }
+}
+
+/* string eval under the class/module context */
+static VALUE
+eval_under(VALUE under, VALUE self, VALUE src, const char *file, int line)
+{
+ NODE *cref = vm_cref_push(GET_THREAD(), under, NOEX_PUBLIC);
+
+ if (rb_safe_level() >= 4) {
+ StringValue(src);
+ }
+ else {
+ SafeStringValue(src);
+ }
+
+ return eval_string_with_cref(self, src, Qnil, cref, file, line);
+}
+
+static VALUE
+specific_eval(int argc, VALUE *argv, VALUE klass, VALUE self)
+{
+ if (rb_block_given_p()) {
+ if (argc > 0) {
+ rb_raise(rb_eArgError, "wrong number of arguments (%d for 0)", argc);
+ }
+ return yield_under(klass, self, Qundef);
+ }
+ else {
+ char *file = "(eval)";
+ int line = 1;
+
+ if (argc == 0) {
+ rb_raise(rb_eArgError, "block not supplied");
+ }
+ else {
+ if (rb_safe_level() >= 4) {
+ StringValue(argv[0]);
+ }
+ else {
+ SafeStringValue(argv[0]);
+ }
+ if (argc > 3) {
+ const char *name = rb_id2name(rb_frame_callee());
+ rb_raise(rb_eArgError,
+ "wrong number of arguments: %s(src) or %s{..}",
+ name, name);
+ }
+ if (argc > 2)
+ line = NUM2INT(argv[2]);
+ if (argc > 1) {
+ file = StringValuePtr(argv[1]);
+ }
+ }
+ return eval_under(klass, self, argv[0], file, line);
+ }
+}
+
+/*
+ * call-seq:
+ * obj.instance_eval(string [, filename [, lineno]] ) => obj
+ * obj.instance_eval {| | 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. In the version of <code>instance_eval</code>
+ * that takes 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
+ * end
+ * k = KlassWithSecret.new
+ * k.instance_eval { @secret } #=> 99
+ */
+
+VALUE
+rb_obj_instance_eval(int argc, VALUE *argv, VALUE self)
+{
+ VALUE klass;
+
+ if (SPECIAL_CONST_P(self)) {
+ klass = Qnil;
+ }
+ 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, VALUE *argv, VALUE self)
+{
+ VALUE klass;
+
+ if (SPECIAL_CONST_P(self)) {
+ klass = Qnil;
+ }
+ 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_. 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, 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.
+ *
+ * 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, VALUE *argv, VALUE mod)
+{
+ return yield_under(mod, mod, rb_ary_new4(argc, argv));
+}
+
+NORETURN(static VALUE rb_f_throw _((int, VALUE *)));
+
+/*
+ * call-seq:
+ * throw(symbol [, obj])
+ *
+ * Transfers control to the end of the active +catch+ block
+ * waiting for _symbol_. Raises +NameError+ if there
+ * is no +catch+ block for the symbol. 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_thread_t *th = GET_THREAD();
+ struct rb_vm_tag *tt = th->tag;
+
+ rb_scan_args(argc, argv, "11", &tag, &value);
+ 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 %s", RSTRING_PTR(desc));
+ }
+ rb_trap_restore_mask();
+ th->errinfo = NEW_THROW_OBJECT(tag, 0, TAG_THROW);
+
+ JUMP_TAG(TAG_THROW);
+#ifndef __GNUC__
+ return Qnil; /* not reached */
+#endif
+}
+
+void
+rb_throw(const char *tag, VALUE val)
+{
+ VALUE argv[2];
+
+ argv[0] = ID2SYM(rb_intern(tag));
+ argv[1] = val;
+ rb_f_throw(2, argv);
+}
+
+void
+rb_throw_obj(VALUE tag, VALUE val)
+{
+ VALUE argv[2];
+
+ argv[0] = tag;
+ argv[1] = val;
+ rb_f_throw(2, argv);
+}
+
+/*
+ * call-seq:
+ * catch(symbol) {| | block } > obj
+ *
+ * +catch+ executes its block. If a +throw+ is
+ * executed, Ruby searches up its stack for a +catch+ block
+ * with a tag corresponding to the +throw+'s
+ * _symbol_. If found, that block is terminated, and
+ * +catch+ returns the value given to +throw+. If
+ * +throw+ is not called, the block terminates normally, and
+ * the value of +catch+ is the value of the last expression
+ * evaluated. +catch+ expressions may be nested, and the
+ * +throw+ call need not be in lexical scope.
+ *
+ * def routine(n)
+ * puts n
+ * throw :done if n <= 0
+ * routine(n-1)
+ * end
+ *
+ *
+ * catch(:done) { routine(3) }
+ *
+ * <em>produces:</em>
+ *
+ * 3
+ * 2
+ * 1
+ * 0
+ */
+
+static VALUE
+rb_f_catch(int argc, VALUE *argv)
+{
+ VALUE tag;
+ int state;
+ VALUE val = Qnil; /* OK */
+ rb_thread_t *th = GET_THREAD();
+ rb_control_frame_t *saved_cfp = th->cfp;
+
+ if (argc == 0) {
+ tag = rb_obj_alloc(rb_cObject);
+ }
+ else {
+ rb_scan_args(argc, argv, "01", &tag);
+ }
+ PUSH_TAG();
+
+ th->tag->tag = tag;
+
+ if ((state = EXEC_TAG()) == 0) {
+ val = rb_yield_0(1, &tag);
+ }
+ else if (state == TAG_THROW && RNODE(th->errinfo)->u1.value == tag) {
+ th->cfp = saved_cfp;
+ val = th->tag->retval;
+ th->errinfo = Qnil;
+ state = 0;
+ }
+ POP_TAG();
+ if (state)
+ JUMP_TAG(state);
+
+ return val;
+}
+
+static VALUE
+catch_null_i(VALUE dmy)
+{
+ return rb_funcall(Qnil, rb_intern("catch"), 0, 0);
+}
+
+static VALUE
+catch_i(VALUE tag)
+{
+ return rb_funcall(Qnil, rb_intern("catch"), 1, tag);
+}
+
+VALUE
+rb_catch(const char *tag, VALUE (*func)(), VALUE data)
+{
+ if (!tag) {
+ return rb_iterate(catch_null_i, 0, func, data);
+ }
+ return rb_iterate(catch_i, ID2SYM(rb_intern(tag)), func, data);
+}
+
+VALUE
+rb_catch_obj(VALUE tag, VALUE (*func)(), VALUE data)
+{
+ return rb_iterate((VALUE (*)_((VALUE)))catch_i, tag, func, data);
+}
+
+/*
+ * call-seq:
+ * caller(start=1) => array
+ *
+ * Returns the current execution stack---an array containing strings in
+ * the form ``<em>file:line</em>'' or ``<em>file:line: in
+ * `method'</em>''. The optional _start_ parameter
+ * determines the number of initial stack entries to omit from the
+ * result.
+ *
+ * def a(skip)
+ * caller(skip)
+ * end
+ * def b(skip)
+ * a(skip)
+ * end
+ * def c(skip)
+ * b(skip)
+ * end
+ * c(0) #=> ["prog:2:in `a'", "prog:5:in `b'", "prog:8:in `c'", "prog:10"]
+ * c(1) #=> ["prog:5:in `b'", "prog:8:in `c'", "prog:11"]
+ * c(2) #=> ["prog:8:in `c'", "prog:12"]
+ * c(3) #=> ["prog:13"]
+ */
+
+static VALUE
+rb_f_caller(int argc, VALUE *argv)
+{
+ VALUE level;
+ int lev;
+
+ rb_scan_args(argc, argv, "01", &level);
+
+ if (NIL_P(level))
+ lev = 1;
+ else
+ lev = NUM2INT(level);
+ if (lev < 0)
+ rb_raise(rb_eArgError, "negative level (%d)", lev);
+
+ return vm_backtrace(GET_THREAD(), lev);
+}
+
+void
+rb_backtrace(void)
+{
+ long i;
+ VALUE ary;
+
+ ary = vm_backtrace(GET_THREAD(), -1);
+ for (i = 0; i < RARRAY_LEN(ary); i++) {
+ printf("\tfrom %s\n", RSTRING_PTR(RARRAY_PTR(ary)[i]));
+ }
+}
+
+VALUE
+rb_make_backtrace(void)
+{
+ return vm_backtrace(GET_THREAD(), -1);
+}
+
+void
+Init_vm_eval(void)
+{
+ 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);
+
+ rb_define_method(rb_cBasicObject, "__send__", rb_f_send, -1);
+ rb_define_method(rb_mKernel, "send", rb_f_send, -1);
+ 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_global_function("caller", rb_f_caller, -1);
+}
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 18:02:55 +0000