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ruby--ruby/eval.c
ko1 0fc7f4bb30 * eval.c, vm_eval.c: use TH_PUSH_TAG() instead of PUSH_TAG(). 
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37267 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2012-10-19 07:57:56 +00:00

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/**********************************************************************
eval.c -
$Author$
created at: Thu Jun 10 14:22:17 JST 1993
Copyright (C) 1993-2007 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#include "eval_intern.h"
#include "iseq.h"
#include "gc.h"
#include "ruby/vm.h"
#include "ruby/encoding.h"
#include "internal.h"
#include "vm_core.h"
#define numberof(array) (int)(sizeof(array) / sizeof((array)[0]))
NORETURN(void rb_raise_jump(VALUE));
NODE *rb_vm_get_cref(const rb_iseq_t *, const VALUE *);
VALUE rb_eLocalJumpError;
VALUE rb_eSysStackError;
#define exception_error GET_VM()->special_exceptions[ruby_error_reenter]
#include "eval_error.c"
#include "eval_jump.c"
/* Initializes the Ruby VM and builtin libraries.
* @retval 0 if succeeded.
* @retval non-zero an error occured.
*/
int
ruby_setup(void)
{
static int initialized = 0;
int state;
if (initialized)
return 0;
initialized = 1;
ruby_init_stack((void *)&state);
Init_BareVM();
Init_heap();
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
rb_call_inits();
ruby_prog_init();
GET_VM()->running = 1;
}
POP_TAG();
return state;
}
/* Calls ruby_setup() and check error.
*
* Prints errors and calls exit(3) if an error occured.
*/
void
ruby_init(void)
{
int state = ruby_setup();
if (state) {
error_print();
exit(EXIT_FAILURE);
}
}
/*! Processes command line arguments and compiles the Ruby source to execute.
*
* This function does:
* \li Processses the given command line flags and arguments for ruby(1)
* \li compiles the source code from the given argument, -e or stdin, and
* \li returns the compiled source as an opaque pointer to an internal data structure
*
* @return an opaque pointer to the compiled source or an internal special value.
* @sa ruby_executable_node().
*/
void *
ruby_options(int argc, char **argv)
{
int state;
void *volatile iseq = 0;
ruby_init_stack((void *)&iseq);
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
SAVE_ROOT_JMPBUF(GET_THREAD(), iseq = ruby_process_options(argc, argv));
}
else {
rb_clear_trace_func();
state = error_handle(state);
iseq = (void *)INT2FIX(state);
}
POP_TAG();
return iseq;
}
static void
ruby_finalize_0(void)
{
PUSH_TAG();
if (EXEC_TAG() == 0) {
rb_trap_exit();
}
POP_TAG();
rb_exec_end_proc();
rb_clear_trace_func();
}
static void
ruby_finalize_1(void)
{
ruby_sig_finalize();
GET_THREAD()->errinfo = Qnil;
rb_gc_call_finalizer_at_exit();
}
/** Runs the VM finalization processes.
*
* <code>END{}</code> and procs registered by <code>Kernel.#at_ext</code> are
* executed here. See the Ruby language spec for more details.
*
* @note This function is allowed to raise an exception if an error occurred.
*/
void
ruby_finalize(void)
{
ruby_finalize_0();
ruby_finalize_1();
}
/** Destructs the VM.
*
* Runs the VM finalization processes as well as ruby_finalize(), and frees
* resources used by the VM.
*
* @param ex Default value to the return value.
* @return If an error occured returns a non-zero. If otherwise, returns the
* given ex.
* @note This function does not raise any exception.
*/
int
ruby_cleanup(volatile int ex)
{
int state;
volatile VALUE errs[2];
rb_thread_t *th = GET_THREAD();
int nerr;
rb_threadptr_interrupt(th);
rb_threadptr_check_signal(th);
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
SAVE_ROOT_JMPBUF(th, { RUBY_VM_CHECK_INTS(th); });
}
POP_TAG();
errs[1] = th->errinfo;
th->safe_level = 0;
ruby_init_stack(&errs[STACK_UPPER(errs, 0, 1)]);
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
SAVE_ROOT_JMPBUF(th, ruby_finalize_0());
}
POP_TAG();
errs[0] = th->errinfo;
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
SAVE_ROOT_JMPBUF(th, rb_thread_terminate_all());
}
else if (ex == 0) {
ex = state;
}
th->errinfo = errs[1];
ex = error_handle(ex);
ruby_finalize_1();
/* unlock again if finalizer took mutexes. */
rb_threadptr_unlock_all_locking_mutexes(GET_THREAD());
POP_TAG();
rb_thread_stop_timer_thread(1);
#if EXIT_SUCCESS != 0 || EXIT_FAILURE != 1
switch (ex) {
#if EXIT_SUCCESS != 0
case 0: ex = EXIT_SUCCESS; break;
#endif
#if EXIT_FAILURE != 1
case 1: ex = EXIT_FAILURE; break;
#endif
}
#endif
state = 0;
for (nerr = 0; nerr < numberof(errs); ++nerr) {
VALUE err = errs[nerr];
if (!RTEST(err)) continue;
/* th->errinfo contains a NODE while break'ing */
if (RB_TYPE_P(err, T_NODE)) continue;
if (rb_obj_is_kind_of(err, rb_eSystemExit)) {
ex = sysexit_status(err);
break;
}
else if (rb_obj_is_kind_of(err, rb_eSignal)) {
VALUE sig = rb_iv_get(err, "signo");
state = NUM2INT(sig);
break;
}
else if (ex == EXIT_SUCCESS) {
ex = EXIT_FAILURE;
}
}
ruby_vm_destruct(GET_VM());
if (state) ruby_default_signal(state);
return ex;
}
static int
ruby_exec_internal(void *n)
{
volatile int state;
VALUE iseq = (VALUE)n;
rb_thread_t *th = GET_THREAD();
if (!n) return 0;
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
SAVE_ROOT_JMPBUF(th, {
th->base_block = 0;
rb_iseq_eval_main(iseq);
});
}
POP_TAG();
return state;
}
/*! Calls ruby_cleanup() and exits the process */
void
ruby_stop(int ex)
{
exit(ruby_cleanup(ex));
}
/*! Checks the return value of ruby_options().
* @param n return value of ruby_options().
* @param status pointer to the exit status of this process.
*
* ruby_options() sometimes returns a special value to indicate this process
* should immediately exit. This function checks if the case. Also stores the
* exit status that the caller have to pass to exit(3) into
* <code>*status</code>.
*
* @retval non-zero if the given opaque pointer is actually a compiled source.
* @retval 0 if the given value is such a special value.
*/
int
ruby_executable_node(void *n, int *status)
{
VALUE v = (VALUE)n;
int s;
switch (v) {
case Qtrue: s = EXIT_SUCCESS; break;
case Qfalse: s = EXIT_FAILURE; break;
default:
if (!FIXNUM_P(v)) return TRUE;
s = FIX2INT(v);
}
if (status) *status = s;
return FALSE;
}
/*! Runs the given compiled source and exits this process.
* @retval 0 if successfully run thhe source
* @retval non-zero if an error occurred.
*/
int
ruby_run_node(void *n)
{
int status;
if (!ruby_executable_node(n, &status)) {
ruby_cleanup(0);
return status;
}
return ruby_cleanup(ruby_exec_node(n));
}
/*! Runs the given compiled source */
int
ruby_exec_node(void *n)
{
ruby_init_stack((void *)&n);
return ruby_exec_internal(n);
}
/*
* call-seq:
* Module.nesting -> array
*
* Returns the list of +Modules+ nested at the point of call.
*
* module M1
* module M2
* $a = Module.nesting
* end
* end
* $a #=> [M1::M2, M1]
* $a[0].name #=> "M1::M2"
*/
static VALUE
rb_mod_nesting(void)
{
VALUE ary = rb_ary_new();
const NODE *cref = rb_vm_cref();
while (cref && cref->nd_next) {
VALUE klass = cref->nd_clss;
if (!(cref->flags & NODE_FL_CREF_PUSHED_BY_EVAL) &&
!NIL_P(klass)) {
rb_ary_push(ary, klass);
}
cref = cref->nd_next;
}
return ary;
}
/*
* call-seq:
* Module.constants -> array
* Module.constants(inherited) -> array
*
* In the first form, returns an array of the names of all
* constants accessible from the point of call.
* This list includes the names of all modules and classes
* defined in the global scope.
*
* Module.constants.first(4)
* # => [:ARGF, :ARGV, :ArgumentError, :Array]
*
* Module.constants.include?(:SEEK_SET) # => false
*
* class IO
* Module.constants.include?(:SEEK_SET) # => true
* end
*
* The second form calls the instance method +constants+.
*/
static VALUE
rb_mod_s_constants(int argc, VALUE *argv, VALUE mod)
{
const NODE *cref = rb_vm_cref();
VALUE klass;
VALUE cbase = 0;
void *data = 0;
if (argc > 0) {
return rb_mod_constants(argc, argv, rb_cModule);
}
while (cref) {
klass = cref->nd_clss;
if (!(cref->flags & NODE_FL_CREF_PUSHED_BY_EVAL) &&
!NIL_P(klass)) {
data = rb_mod_const_at(cref->nd_clss, data);
if (!cbase) {
cbase = klass;
}
}
cref = cref->nd_next;
}
if (cbase) {
data = rb_mod_const_of(cbase, data);
}
return rb_const_list(data);
}
void
rb_frozen_class_p(VALUE klass)
{
const char *desc = "something(?!)";
if (OBJ_FROZEN(klass)) {
if (FL_TEST(klass, FL_SINGLETON))
desc = "object";
else {
switch (TYPE(klass)) {
case T_MODULE:
case T_ICLASS:
desc = "module";
break;
case T_CLASS:
desc = "class";
break;
}
}
rb_error_frozen(desc);
}
}
NORETURN(static void rb_longjmp(int, volatile VALUE));
static void
setup_exception(rb_thread_t *th, int tag, volatile VALUE mesg)
{
VALUE at;
VALUE e;
const char *file;
volatile int line = 0;
if (NIL_P(mesg)) {
mesg = th->errinfo;
if (INTERNAL_EXCEPTION_P(mesg)) JUMP_TAG(TAG_FATAL);
}
if (NIL_P(mesg)) {
mesg = rb_exc_new(rb_eRuntimeError, 0, 0);
}
file = rb_sourcefile();
if (file) line = rb_sourceline();
if (file && !NIL_P(mesg)) {
if (mesg == sysstack_error) {
at = rb_enc_sprintf(rb_usascii_encoding(), "%s:%d", file, line);
at = rb_ary_new3(1, at);
rb_iv_set(mesg, "bt", at);
}
else {
at = get_backtrace(mesg);
if (NIL_P(at)) {
at = rb_vm_backtrace_object();
if (OBJ_FROZEN(mesg)) {
mesg = rb_obj_dup(mesg);
}
set_backtrace(mesg, at);
}
}
}
if (!NIL_P(mesg)) {
th->errinfo = mesg;
}
if (RTEST(ruby_debug) && !NIL_P(e = th->errinfo) &&
!rb_obj_is_kind_of(e, rb_eSystemExit)) {
int status;
PUSH_TAG();
if ((status = EXEC_TAG()) == 0) {
RB_GC_GUARD(e) = rb_obj_as_string(e);
if (file && line) {
warn_printf("Exception `%s' at %s:%d - %s\n",
rb_obj_classname(th->errinfo),
file, line, RSTRING_PTR(e));
}
else if (file) {
warn_printf("Exception `%s' at %s - %s\n",
rb_obj_classname(th->errinfo),
file, RSTRING_PTR(e));
}
else {
warn_printf("Exception `%s' - %s\n",
rb_obj_classname(th->errinfo),
RSTRING_PTR(e));
}
}
POP_TAG();
if (status == TAG_FATAL && th->errinfo == exception_error) {
th->errinfo = mesg;
}
else if (status) {
rb_threadptr_reset_raised(th);
JUMP_TAG(status);
}
}
if (rb_threadptr_set_raised(th)) {
th->errinfo = exception_error;
rb_threadptr_reset_raised(th);
JUMP_TAG(TAG_FATAL);
}
if (tag != TAG_FATAL) {
EXEC_EVENT_HOOK(th, RUBY_EVENT_RAISE, th->cfp->self, 0, 0);
}
}
static void
rb_longjmp(int tag, volatile VALUE mesg)
{
rb_thread_t *th = GET_THREAD();
setup_exception(th, tag, mesg);
rb_thread_raised_clear(th);
JUMP_TAG(tag);
}
static VALUE make_exception(int argc, VALUE *argv, int isstr);
void
rb_exc_raise(VALUE mesg)
{
if (!NIL_P(mesg)) {
mesg = make_exception(1, &mesg, FALSE);
}
rb_longjmp(TAG_RAISE, mesg);
}
void
rb_exc_fatal(VALUE mesg)
{
if (!NIL_P(mesg)) {
mesg = make_exception(1, &mesg, FALSE);
}
rb_longjmp(TAG_FATAL, mesg);
}
void
rb_interrupt(void)
{
rb_raise(rb_eInterrupt, "%s", "");
}
static VALUE get_errinfo(void);
/*
* call-seq:
* raise
* raise(string)
* raise(exception [, string [, array]])
* fail
* fail(string)
* fail(exception [, string [, array]])
*
* With no arguments, raises the exception in <code>$!</code> or raises
* a <code>RuntimeError</code> if <code>$!</code> is +nil+.
* With a single +String+ argument, raises a
* +RuntimeError+ with the string as a message. Otherwise,
* the first parameter should be the name of an +Exception+
* class (or an object that returns an +Exception+ object when sent
* an +exception+ message). The optional second parameter sets the
* message associated with the exception, and the third parameter is an
* array of callback information. Exceptions are caught by the
* +rescue+ clause of <code>begin...end</code> blocks.
*
* raise "Failed to create socket"
* raise ArgumentError, "No parameters", caller
*/
static VALUE
rb_f_raise(int argc, VALUE *argv)
{
VALUE err;
if (argc == 0) {
err = get_errinfo();
if (!NIL_P(err)) {
argc = 1;
argv = &err;
}
}
rb_raise_jump(rb_make_exception(argc, argv));
UNREACHABLE;
}
static VALUE
make_exception(int argc, VALUE *argv, int isstr)
{
VALUE mesg;
ID exception;
int n;
mesg = Qnil;
switch (argc) {
case 0:
break;
case 1:
if (NIL_P(argv[0]))
break;
if (isstr) {
mesg = rb_check_string_type(argv[0]);
if (!NIL_P(mesg)) {
mesg = rb_exc_new3(rb_eRuntimeError, mesg);
break;
}
}
n = 0;
goto exception_call;
case 2:
case 3:
n = 1;
exception_call:
if (argv[0] == sysstack_error) return argv[0];
CONST_ID(exception, "exception");
mesg = rb_check_funcall(argv[0], exception, n, argv+1);
if (mesg == Qundef) {
rb_raise(rb_eTypeError, "exception class/object expected");
}
break;
default:
rb_check_arity(argc, 0, 3);
break;
}
if (argc > 0) {
if (!rb_obj_is_kind_of(mesg, rb_eException))
rb_raise(rb_eTypeError, "exception object expected");
if (argc > 2)
set_backtrace(mesg, argv[2]);
}
return mesg;
}
VALUE
rb_make_exception(int argc, VALUE *argv)
{
return make_exception(argc, argv, TRUE);
}
void
rb_raise_jump(VALUE mesg)
{
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *cfp = th->cfp;
VALUE klass = cfp->me->klass;
VALUE self = cfp->self;
ID mid = cfp->me->called_id;
th->cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(th->cfp);
setup_exception(th, TAG_RAISE, mesg);
EXEC_EVENT_HOOK(th, RUBY_EVENT_C_RETURN, self, mid, klass);
rb_thread_raised_clear(th);
JUMP_TAG(TAG_RAISE);
}
void
rb_jump_tag(int tag)
{
JUMP_TAG(tag);
}
int
rb_block_given_p(void)
{
rb_thread_t *th = GET_THREAD();
if (rb_vm_control_frame_block_ptr(th->cfp)) {
return TRUE;
}
else {
return FALSE;
}
}
int
rb_iterator_p(void)
{
return rb_block_given_p();
}
VALUE rb_eThreadError;
void
rb_need_block(void)
{
if (!rb_block_given_p()) {
rb_vm_localjump_error("no block given", Qnil, 0);
}
}
VALUE
rb_rescue2(VALUE (* b_proc) (ANYARGS), VALUE data1,
VALUE (* r_proc) (ANYARGS), VALUE data2, ...)
{
int state;
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *cfp = th->cfp;
volatile VALUE result;
volatile VALUE e_info = th->errinfo;
va_list args;
TH_PUSH_TAG(th);
if ((state = TH_EXEC_TAG()) == 0) {
retry_entry:
result = (*b_proc) (data1);
}
else {
th->cfp = cfp; /* restore */
if (state == TAG_RAISE) {
int handle = FALSE;
VALUE eclass;
va_init_list(args, data2);
while ((eclass = va_arg(args, VALUE)) != 0) {
if (rb_obj_is_kind_of(th->errinfo, eclass)) {
handle = TRUE;
break;
}
}
va_end(args);
if (handle) {
if (r_proc) {
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
result = (*r_proc) (data2, th->errinfo);
}
POP_TAG();
if (state == TAG_RETRY) {
state = 0;
th->errinfo = Qnil;
goto retry_entry;
}
}
else {
result = Qnil;
state = 0;
}
if (state == 0) {
th->errinfo = e_info;
}
}
}
}
TH_POP_TAG();
if (state)
JUMP_TAG(state);
return result;
}
VALUE
rb_rescue(VALUE (* b_proc)(ANYARGS), VALUE data1,
VALUE (* r_proc)(ANYARGS), VALUE data2)
{
return rb_rescue2(b_proc, data1, r_proc, data2, rb_eStandardError,
(VALUE)0);
}
VALUE
rb_protect(VALUE (* proc) (VALUE), VALUE data, int * state)
{
volatile VALUE result = Qnil;
int status;
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *cfp = th->cfp;
struct rb_vm_protect_tag protect_tag;
rb_jmpbuf_t org_jmpbuf;
protect_tag.prev = th->protect_tag;
TH_PUSH_TAG(th);
th->protect_tag = &protect_tag;
MEMCPY(&org_jmpbuf, &(th)->root_jmpbuf, rb_jmpbuf_t, 1);
if ((status = TH_EXEC_TAG()) == 0) {
SAVE_ROOT_JMPBUF(th, result = (*proc) (data));
}
MEMCPY(&(th)->root_jmpbuf, &org_jmpbuf, rb_jmpbuf_t, 1);
th->protect_tag = protect_tag.prev;
TH_POP_TAG();
if (state) {
*state = status;
}
if (status != 0) {
th->cfp = cfp;
return Qnil;
}
return result;
}
VALUE
rb_ensure(VALUE (*b_proc)(ANYARGS), VALUE data1, VALUE (*e_proc)(ANYARGS), VALUE data2)
{
int state;
volatile VALUE result = Qnil;
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
result = (*b_proc) (data1);
}
POP_TAG();
/* TODO: fix me */
/* retval = prot_tag ? prot_tag->retval : Qnil; */ /* save retval */
(*e_proc) (data2);
if (state)
JUMP_TAG(state);
return result;
}
static const rb_method_entry_t *
method_entry_of_iseq(rb_control_frame_t *cfp, rb_iseq_t *iseq)
{
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *cfp_limit;
cfp_limit = (rb_control_frame_t *)(th->stack + th->stack_size);
while (cfp_limit > cfp) {
if (cfp->iseq == iseq)
return cfp->me;
cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
}
return 0;
}
static ID
frame_func_id(rb_control_frame_t *cfp)
{
const rb_method_entry_t *me_local;
rb_iseq_t *iseq = cfp->iseq;
if (cfp->me) {
return cfp->me->def->original_id;
}
while (iseq) {
if (RUBY_VM_IFUNC_P(iseq)) {
NODE *ifunc = (NODE *)iseq;
if (ifunc->nd_aid) return ifunc->nd_aid;
return rb_intern("<ifunc>");
}
me_local = method_entry_of_iseq(cfp, iseq);
if (me_local) {
cfp->me = me_local;
return me_local->def->original_id;
}
if (iseq->defined_method_id) {
return iseq->defined_method_id;
}
if (iseq->local_iseq == iseq) {
break;
}
iseq = iseq->parent_iseq;
}
return 0;
}
static ID
frame_called_id(rb_control_frame_t *cfp)
{
const rb_method_entry_t *me_local;
rb_iseq_t *iseq = cfp->iseq;
if (cfp->me) {
return cfp->me->called_id;
}
while (iseq) {
if (RUBY_VM_IFUNC_P(iseq)) {
NODE *ifunc = (NODE *)iseq;
if (ifunc->nd_aid) return ifunc->nd_aid;
return rb_intern("<ifunc>");
}
me_local = method_entry_of_iseq(cfp, iseq);
if (me_local) {
cfp->me = me_local;
return me_local->called_id;
}
if (iseq->defined_method_id) {
return iseq->defined_method_id;
}
if (iseq->local_iseq == iseq) {
break;
}
iseq = iseq->parent_iseq;
}
return 0;
}
ID
rb_frame_this_func(void)
{
return frame_func_id(GET_THREAD()->cfp);
}
static rb_control_frame_t *
previous_frame(rb_thread_t *th)
{
rb_control_frame_t *prev_cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(th->cfp);
/* check if prev_cfp can be accessible */
if ((void *)(th->stack + th->stack_size) == (void *)(prev_cfp)) {
return 0;
}
return prev_cfp;
}
ID
rb_frame_callee(void)
{
rb_control_frame_t *prev_cfp = previous_frame(GET_THREAD());
if (!prev_cfp) return 0;
return frame_called_id(prev_cfp);
}
static ID
rb_frame_caller(void)
{
rb_control_frame_t *prev_cfp = previous_frame(GET_THREAD());
if (!prev_cfp) return 0;
return frame_func_id(prev_cfp);
}
void
rb_frame_pop(void)
{
rb_thread_t *th = GET_THREAD();
th->cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(th->cfp);
}
/*
* call-seq:
* append_features(mod) -> mod
*
* When this module is included in another, Ruby calls
* <code>append_features</code> in this module, passing it the
* receiving module in _mod_. Ruby's default implementation is
* to add the constants, methods, and module variables of this module
* to _mod_ if this module has not already been added to
* _mod_ or one of its ancestors. See also <code>Module#include</code>.
*/
static VALUE
rb_mod_append_features(VALUE module, VALUE include)
{
switch (TYPE(include)) {
case T_CLASS:
case T_MODULE:
break;
default:
Check_Type(include, T_CLASS);
break;
}
rb_include_module(include, module);
return module;
}
/*
* call-seq:
* include(module, ...) -> self
*
* Invokes <code>Module.append_features</code> on each parameter in reverse order.
*/
static VALUE
rb_mod_include(int argc, VALUE *argv, VALUE module)
{
int i;
ID id_append_features, id_included;
CONST_ID(id_append_features, "append_features");
CONST_ID(id_included, "included");
for (i = 0; i < argc; i++)
Check_Type(argv[i], T_MODULE);
while (argc--) {
rb_funcall(argv[argc], id_append_features, 1, module);
rb_funcall(argv[argc], id_included, 1, module);
}
return module;
}
/*
* call-seq:
* prepend_features(mod) -> mod
*
* When this module is prepended in another, Ruby calls
* <code>prepend_features</code> in this module, passing it the
* receiving module in _mod_. Ruby's default implementation is
* to overlay the constants, methods, and module variables of this module
* to _mod_ if this module has not already been added to
* _mod_ or one of its ancestors. See also <code>Module#prepend</code>.
*/
static VALUE
rb_mod_prepend_features(VALUE module, VALUE prepend)
{
switch (TYPE(prepend)) {
case T_CLASS:
case T_MODULE:
break;
default:
Check_Type(prepend, T_CLASS);
break;
}
rb_prepend_module(prepend, module);
return module;
}
/*
* call-seq:
* prepend(module, ...) -> self
*
* Invokes <code>Module.prepend_features</code> on each parameter in reverse order.
*/
static VALUE
rb_mod_prepend(int argc, VALUE *argv, VALUE module)
{
int i;
ID id_prepend_features, id_prepended;
CONST_ID(id_prepend_features, "prepend_features");
CONST_ID(id_prepended, "prepended");
for (i = 0; i < argc; i++)
Check_Type(argv[i], T_MODULE);
while (argc--) {
rb_funcall(argv[argc], id_prepend_features, 1, module);
rb_funcall(argv[argc], id_prepended, 1, module);
}
return module;
}
static
void check_class_or_module(VALUE obj)
{
if (!RB_TYPE_P(obj, T_CLASS) && !RB_TYPE_P(obj, T_MODULE)) {
VALUE str = rb_inspect(obj);
rb_raise(rb_eTypeError, "%s is not a class/module",
StringValuePtr(str));
}
}
static VALUE
hidden_identity_hash_new()
{
VALUE hash = rb_hash_new();
rb_funcall(hash, rb_intern("compare_by_identity"), 0);
RBASIC(hash)->klass = 0; /* hide from ObjectSpace */
return hash;
}
void
rb_using_refinement(NODE *cref, VALUE klass, VALUE module)
{
VALUE iclass, c, superclass = klass;
check_class_or_module(klass);
Check_Type(module, T_MODULE);
if (NIL_P(cref->nd_refinements)) {
cref->nd_refinements = hidden_identity_hash_new();
}
else {
if (cref->flags & NODE_FL_CREF_OMOD_SHARED) {
cref->nd_refinements = rb_hash_dup(cref->nd_refinements);
cref->flags &= ~NODE_FL_CREF_OMOD_SHARED;
}
if (!NIL_P(c = rb_hash_lookup(cref->nd_refinements, klass))) {
superclass = c;
while (c && TYPE(c) == T_ICLASS) {
if (RBASIC(c)->klass == module) {
/* already used refinement */
return;
}
c = RCLASS_SUPER(c);
}
}
}
FL_SET(module, RMODULE_IS_OVERLAID);
c = iclass = rb_include_class_new(module, superclass);
RCLASS_REFINED_CLASS(c) = klass;
module = RCLASS_SUPER(module);
while (module) {
FL_SET(module, RMODULE_IS_OVERLAID);
c = RCLASS_SUPER(c) = rb_include_class_new(module, RCLASS_SUPER(c));
RCLASS_REFINED_CLASS(c) = klass;
module = RCLASS_SUPER(module);
}
rb_hash_aset(cref->nd_refinements, klass, iclass);
rb_clear_cache_by_class(klass);
}
static int
using_module_i(VALUE klass, VALUE module, VALUE arg)
{
NODE *cref = (NODE *) arg;
rb_using_refinement(cref, klass, module);
return ST_CONTINUE;
}
void
rb_using_module(NODE *cref, VALUE module)
{
ID id_refinements;
VALUE refinements;
check_class_or_module(module);
CONST_ID(id_refinements, "__refinements__");
refinements = rb_attr_get(module, id_refinements);
if (NIL_P(refinements)) return;
rb_hash_foreach(refinements, using_module_i, (VALUE) cref);
}
/*
* call-seq:
* using(module) -> self
*
* Import class refinements from <i>module</i> into the receiver.
*/
static VALUE
rb_mod_using(VALUE self, VALUE module)
{
NODE *cref = rb_vm_cref();
ID id_using_modules;
VALUE using_modules;
Check_Type(module, T_MODULE);
CONST_ID(id_using_modules, "__using_modules__");
using_modules = rb_attr_get(self, id_using_modules);
if (NIL_P(using_modules)) {
using_modules = hidden_identity_hash_new();
rb_ivar_set(self, id_using_modules, using_modules);
}
rb_hash_aset(using_modules, module, Qtrue);
rb_using_module(cref, module);
rb_funcall(module, rb_intern("used"), 1, self);
return self;
}
void rb_redefine_opt_method(VALUE, ID);
static VALUE
refinement_module_method_added(VALUE mod, VALUE mid)
{
ID id = SYM2ID(mid);
ID id_refined_class;
VALUE klass;
CONST_ID(id_refined_class, "__refined_class__");
klass = rb_ivar_get(mod, id_refined_class);
rb_redefine_opt_method(klass, id);
return Qnil;
}
static VALUE
refinement_module_include(int argc, VALUE *argv, VALUE module)
{
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *cfp = th->cfp;
rb_control_frame_t *end_cfp = RUBY_VM_END_CONTROL_FRAME(th);
VALUE result = rb_mod_include(argc, argv, module);
NODE *cref;
ID id_refined_class;
VALUE klass, c;
CONST_ID(id_refined_class, "__refined_class__");
klass = rb_attr_get(module, id_refined_class);
while (RUBY_VM_VALID_CONTROL_FRAME_P(cfp, end_cfp)) {
if (RUBY_VM_NORMAL_ISEQ_P(cfp->iseq) &&
(cref = rb_vm_get_cref(cfp->iseq, cfp->ep)) &&
!NIL_P(cref->nd_refinements) &&
!NIL_P(c = rb_hash_lookup(cref->nd_refinements, klass))) {
while (argc--) {
VALUE mod = argv[argc];
if (rb_class_inherited_p(module, mod)) {
RCLASS_SUPER(c) =
rb_include_class_new(mod, RCLASS_SUPER(c));
}
}
break;
}
cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
}
return result;
}
/*
* call-seq:
* refine(klass) { block } -> module
*
* Refine <i>klass</i> in the receiver.
*
* Returns an overlaid module.
*/
static VALUE
rb_mod_refine(VALUE module, VALUE klass)
{
NODE *cref = rb_vm_cref();
VALUE mod;
ID id_refinements, id_refined_class;
VALUE refinements;
check_class_or_module(klass);
CONST_ID(id_refinements, "__refinements__");
refinements = rb_attr_get(module, id_refinements);
if (NIL_P(refinements)) {
refinements = hidden_identity_hash_new();
rb_ivar_set(module, id_refinements, refinements);
}
mod = rb_hash_lookup(refinements, klass);
if (NIL_P(mod)) {
mod = rb_module_new();
CONST_ID(id_refined_class, "__refined_class__");
rb_ivar_set(mod, id_refined_class, klass);
rb_define_singleton_method(mod, "method_added",
refinement_module_method_added, 1);
rb_define_singleton_method(mod, "include",
refinement_module_include, -1);
rb_using_refinement(cref, klass, mod);
rb_hash_aset(refinements, klass, mod);
}
rb_mod_module_eval(0, NULL, mod);
return mod;
}
static int
refinements_i(VALUE key, VALUE value, VALUE arg)
{
rb_hash_aset(arg, key, value);
return ST_CONTINUE;
}
/*
* call-seq:
* refinements -> hash
*
* Returns refinements in the receiver as a hash table, whose key is a
* refined class and whose value is a refinement module.
*/
static VALUE
rb_mod_refinements(VALUE module)
{
ID id_refinements;
VALUE refinements, result;
CONST_ID(id_refinements, "__refinements__");
refinements = rb_attr_get(module, id_refinements);
if (NIL_P(refinements)) {
return rb_hash_new();
}
result = rb_hash_new();
rb_hash_foreach(refinements, refinements_i, result);
return result;
}
void
rb_obj_call_init(VALUE obj, int argc, VALUE *argv)
{
PASS_PASSED_BLOCK();
rb_funcall2(obj, idInitialize, argc, argv);
}
void
rb_extend_object(VALUE obj, VALUE module)
{
rb_include_module(rb_singleton_class(obj), module);
}
/*
* call-seq:
* extend_object(obj) -> obj
*
* Extends the specified object by adding this module's constants and
* methods (which are added as singleton methods). This is the callback
* method used by <code>Object#extend</code>.
*
* module Picky
* def Picky.extend_object(o)
* if String === o
* puts "Can't add Picky to a String"
* else
* puts "Picky added to #{o.class}"
* super
* end
* end
* end
* (s = Array.new).extend Picky # Call Object.extend
* (s = "quick brown fox").extend Picky
*
* <em>produces:</em>
*
* Picky added to Array
* Can't add Picky to a String
*/
static VALUE
rb_mod_extend_object(VALUE mod, VALUE obj)
{
rb_extend_object(obj, mod);
return obj;
}
/*
* call-seq:
* obj.extend(module, ...) -> obj
*
* Adds to _obj_ the instance methods from each module given as a
* parameter.
*
* module Mod
* def hello
* "Hello from Mod.\n"
* end
* end
*
* class Klass
* def hello
* "Hello from Klass.\n"
* end
* end
*
* k = Klass.new
* k.hello #=> "Hello from Klass.\n"
* k.extend(Mod) #=> #<Klass:0x401b3bc8>
* k.hello #=> "Hello from Mod.\n"
*/
static VALUE
rb_obj_extend(int argc, VALUE *argv, VALUE obj)
{
int i;
ID id_extend_object, id_extended;
CONST_ID(id_extend_object, "extend_object");
CONST_ID(id_extended, "extended");
rb_check_arity(argc, 1, UNLIMITED_ARGUMENTS);
for (i = 0; i < argc; i++)
Check_Type(argv[i], T_MODULE);
while (argc--) {
rb_funcall(argv[argc], id_extend_object, 1, obj);
rb_funcall(argv[argc], id_extended, 1, obj);
}
return obj;
}
/*
* call-seq:
* include(module, ...) -> self
*
* Invokes <code>Module.append_features</code>
* on each parameter in turn. Effectively adds the methods and constants
* in each module to the receiver.
*/
static VALUE
top_include(int argc, VALUE *argv, VALUE self)
{
rb_thread_t *th = GET_THREAD();
rb_secure(4);
if (th->top_wrapper) {
rb_warning
("main#include in the wrapped load is effective only in wrapper module");
return rb_mod_include(argc, argv, th->top_wrapper);
}
return rb_mod_include(argc, argv, rb_cObject);
}
/*
* call-seq:
* using(module) -> self
*
* Import class refinements from <i>module</i> into the scope where
* <code>using</code> is called.
*/
static VALUE
f_using(VALUE self, VALUE module)
{
NODE *cref = rb_vm_cref();
Check_Type(module, T_MODULE);
rb_using_module(cref, module);
return self;
}
static VALUE *
errinfo_place(rb_thread_t *th)
{
rb_control_frame_t *cfp = th->cfp;
rb_control_frame_t *end_cfp = RUBY_VM_END_CONTROL_FRAME(th);
while (RUBY_VM_VALID_CONTROL_FRAME_P(cfp, end_cfp)) {
if (RUBY_VM_NORMAL_ISEQ_P(cfp->iseq)) {
if (cfp->iseq->type == ISEQ_TYPE_RESCUE) {
return &cfp->ep[-2];
}
else if (cfp->iseq->type == ISEQ_TYPE_ENSURE &&
!RB_TYPE_P(cfp->ep[-2], T_NODE) &&
!FIXNUM_P(cfp->ep[-2])) {
return &cfp->ep[-2];
}
}
cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
}
return 0;
}
static VALUE
get_thread_errinfo(rb_thread_t *th)
{
VALUE *ptr = errinfo_place(th);
if (ptr) {
return *ptr;
}
else {
return th->errinfo;
}
}
static VALUE
get_errinfo(void)
{
return get_thread_errinfo(GET_THREAD());
}
static VALUE
errinfo_getter(ID id)
{
return get_errinfo();
}
#if 0
static void
errinfo_setter(VALUE val, ID id, VALUE *var)
{
if (!NIL_P(val) && !rb_obj_is_kind_of(val, rb_eException)) {
rb_raise(rb_eTypeError, "assigning non-exception to $!");
}
else {
VALUE *ptr = errinfo_place(GET_THREAD());
if (ptr) {
*ptr = val;
}
else {
rb_raise(rb_eRuntimeError, "errinfo_setter: not in rescue clause.");
}
}
}
#endif
VALUE
rb_errinfo(void)
{
rb_thread_t *th = GET_THREAD();
return th->errinfo;
}
void
rb_set_errinfo(VALUE err)
{
if (!NIL_P(err) && !rb_obj_is_kind_of(err, rb_eException)) {
rb_raise(rb_eTypeError, "assigning non-exception to $!");
}
GET_THREAD()->errinfo = err;
}
VALUE
rb_rubylevel_errinfo(void)
{
return get_errinfo();
}
static VALUE
errat_getter(ID id)
{
VALUE err = get_errinfo();
if (!NIL_P(err)) {
return get_backtrace(err);
}
else {
return Qnil;
}
}
static void
errat_setter(VALUE val, ID id, VALUE *var)
{
VALUE err = get_errinfo();
if (NIL_P(err)) {
rb_raise(rb_eArgError, "$! not set");
}
set_backtrace(err, val);
}
/*
* call-seq:
* __method__ -> symbol
* __callee__ -> symbol
*
* Returns the name of the current method as a Symbol.
* If called outside of a method, it returns <code>nil</code>.
*
*/
static VALUE
rb_f_method_name(void)
{
ID fname = rb_frame_caller(); /* need *caller* ID */
if (fname) {
return ID2SYM(fname);
}
else {
return Qnil;
}
}
static VALUE
rb_f_callee_name(void)
{
ID fname = rb_frame_callee(); /* need *callee* ID */
if (fname) {
return ID2SYM(fname);
}
else {
return Qnil;
}
}
void
Init_eval(void)
{
rb_define_virtual_variable("$@", errat_getter, errat_setter);
rb_define_virtual_variable("$!", errinfo_getter, 0);
rb_define_global_function("raise", rb_f_raise, -1);
rb_define_global_function("fail", rb_f_raise, -1);
rb_define_global_function("global_variables", rb_f_global_variables, 0); /* in variable.c */
rb_define_global_function("__method__", rb_f_method_name, 0);
rb_define_global_function("__callee__", rb_f_callee_name, 0);
rb_define_private_method(rb_cModule, "append_features", rb_mod_append_features, 1);
rb_define_private_method(rb_cModule, "extend_object", rb_mod_extend_object, 1);
rb_define_private_method(rb_cModule, "include", rb_mod_include, -1);
rb_define_private_method(rb_cModule, "prepend_features", rb_mod_prepend_features, 1);
rb_define_private_method(rb_cModule, "prepend", rb_mod_prepend, -1);
rb_define_private_method(rb_cModule, "using", rb_mod_using, 1);
rb_define_private_method(rb_cModule, "refine", rb_mod_refine, 1);
rb_define_method(rb_cModule, "refinements", rb_mod_refinements, 0);
rb_undef_method(rb_cClass, "module_function");
Init_vm_eval();
Init_eval_method();
rb_define_singleton_method(rb_cModule, "nesting", rb_mod_nesting, 0);
rb_define_singleton_method(rb_cModule, "constants", rb_mod_s_constants, -1);
rb_define_singleton_method(rb_vm_top_self(), "include", top_include, -1);
rb_define_global_function("using", f_using, 1);
rb_define_method(rb_mKernel, "extend", rb_obj_extend, -1);
rb_define_global_function("trace_var", rb_f_trace_var, -1); /* in variable.c */
rb_define_global_function("untrace_var", rb_f_untrace_var, -1); /* in variable.c */
exception_error = rb_exc_new3(rb_eFatal,
rb_obj_freeze(rb_str_new2("exception reentered")));
OBJ_TAINT(exception_error);
OBJ_FREEZE(exception_error);
}
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