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/**********************************************************************

proc.c - Proc, Binding, Env

$Author$
created at: Wed Jan 17 12:13:14 2007

Copyright (C) 2004-2007 Koichi Sasada

**********************************************************************/

#include "eval_intern.h"
#include "internal.h"
#include "gc.h"
#include "iseq.h"

struct METHOD {
    VALUE recv;
    VALUE rclass;
    VALUE defined_class;
    ID id;
    rb_method_entry_t *me;
    struct unlinked_method_entry_list_entry *ume;
};

VALUE rb_cUnboundMethod;
VALUE rb_cMethod;
VALUE rb_cBinding;
VALUE rb_cProc;

static VALUE bmcall(VALUE, VALUE);
static int method_arity(VALUE);
static ID attached;

/* Proc */

#define IS_METHOD_PROC_NODE(node) (nd_type(node) == NODE_IFUNC && (node)->nd_cfnc == bmcall)

static void
proc_free(void *ptr)
{
    RUBY_FREE_ENTER("proc");
    if (ptr) {
ruby_xfree(ptr);
    }
    RUBY_FREE_LEAVE("proc");
}

static void
proc_mark(void *ptr)
{
    rb_proc_t *proc;
    RUBY_MARK_ENTER("proc");
    if (ptr) {
proc = ptr;
RUBY_MARK_UNLESS_NULL(proc->envval);
RUBY_MARK_UNLESS_NULL(proc->blockprocval);
RUBY_MARK_UNLESS_NULL(proc->block.proc);
RUBY_MARK_UNLESS_NULL(proc->block.self);
if (proc->block.iseq && RUBY_VM_IFUNC_P(proc->block.iseq)) {
RUBY_MARK_UNLESS_NULL((VALUE)(proc->block.iseq));
}
    }
    RUBY_MARK_LEAVE("proc");
}

static size_t
proc_memsize(const void *ptr)
{
    return ptr ? sizeof(rb_proc_t) : 0;
}

static const rb_data_type_t proc_data_type = {
    "proc",
    {
proc_mark,
proc_free,
proc_memsize,
    },
};

VALUE
rb_proc_alloc(VALUE klass)
{
    rb_proc_t *proc;
    return TypedData_Make_Struct(klass, rb_proc_t, &proc_data_type, proc);
}

VALUE
rb_obj_is_proc(VALUE proc)
{
    if (rb_typeddata_is_kind_of(proc, &proc_data_type)) {
return Qtrue;
    }
    else {
return Qfalse;
    }
}

/* :nodoc: */
static VALUE
proc_dup(VALUE self)
{
    VALUE procval = rb_proc_alloc(rb_cProc);
    rb_proc_t *src, *dst;
    GetProcPtr(self, src);
    GetProcPtr(procval, dst);

    dst->block = src->block;
    dst->block.proc = procval;
    dst->blockprocval = src->blockprocval;
    dst->envval = src->envval;
    dst->safe_level = src->safe_level;
    dst->is_lambda = src->is_lambda;

    return procval;
}

/* :nodoc: */
static VALUE
proc_clone(VALUE self)
{
    VALUE procval = proc_dup(self);
    CLONESETUP(procval, self);
    return procval;
}

/*
* call-seq:
* prc.lambda? -> true or false
*
* Returns +true+ for a Proc object for which argument handling is rigid.
* Such procs are typically generated by +lambda+.
*
* A Proc object generated by +proc+ ignores extra arguments.
*
* proc {|a,b| [a,b] }.call(1,2,3) #=> [1,2]
*
* It provides +nil+ for missing arguments.
*
* proc {|a,b| [a,b] }.call(1) #=> [1,nil]
*
* It expands a single array argument.
*
* proc {|a,b| [a,b] }.call([1,2]) #=> [1,2]
*
* A Proc object generated by +lambda+ doesn't have such tricks.
*
* lambda {|a,b| [a,b] }.call(1,2,3) #=> ArgumentError
* lambda {|a,b| [a,b] }.call(1) #=> ArgumentError
* lambda {|a,b| [a,b] }.call([1,2]) #=> ArgumentError
*
* Proc#lambda? is a predicate for the tricks.
* It returns +true+ if no tricks apply.
*
* lambda {}.lambda? #=> true
* proc {}.lambda? #=> false
*
* Proc.new is the same as +proc+.
*
* Proc.new {}.lambda? #=> false
*
* +lambda+, +proc+ and Proc.new preserve the tricks of
* a Proc object given by <code>&</code> argument.
*
* lambda(&lambda {}).lambda? #=> true
* proc(&lambda {}).lambda? #=> true
* Proc.new(&lambda {}).lambda? #=> true
*
* lambda(&proc {}).lambda? #=> false
* proc(&proc {}).lambda? #=> false
* Proc.new(&proc {}).lambda? #=> false
*
* A Proc object generated by <code>&</code> argument has the tricks
*
* def n(&b) b.lambda? end
* n {} #=> false
*
* The <code>&</code> argument preserves the tricks if a Proc object
* is given by <code>&</code> argument.
*
* n(&lambda {}) #=> true
* n(&proc {}) #=> false
* n(&Proc.new {}) #=> false
*
* A Proc object converted from a method has no tricks.
*
* def m() end
* method(:m).to_proc.lambda? #=> true
*
* n(&method(:m)) #=> true
* n(&method(:m).to_proc) #=> true
*
* +define_method+ is treated the same as method definition.
* The defined method has no tricks.
*
* class C
* define_method(:d) {}
* end
* C.new.d(1,2) #=> ArgumentError
* C.new.method(:d).to_proc.lambda? #=> true
*
* +define_method+ always defines a method without the tricks,
* even if a non-lambda Proc object is given.
* This is the only exception for which the tricks are not preserved.
*
* class C
* define_method(:e, &proc {})
* end
* C.new.e(1,2) #=> ArgumentError
* C.new.method(:e).to_proc.lambda? #=> true
*
* This exception insures that methods never have tricks
* and makes it easy to have wrappers to define methods that behave as usual.
*
* class C
* def self.def2(name, &body)
* define_method(name, &body)
* end
*
* def2(:f) {}
* end
* C.new.f(1,2) #=> ArgumentError
*
* The wrapper <i>def2</i> defines a method which has no tricks.
*
*/

VALUE
rb_proc_lambda_p(VALUE procval)
{
    rb_proc_t *proc;
    GetProcPtr(procval, proc);

    return proc->is_lambda ? Qtrue : Qfalse;
}

/* Binding */

static void
binding_free(void *ptr)
{
    rb_binding_t *bind;
    RUBY_FREE_ENTER("binding");
    if (ptr) {
bind = ptr;
ruby_xfree(bind);
    }
    RUBY_FREE_LEAVE("binding");
}

static void
binding_mark(void *ptr)
{
    rb_binding_t *bind;
    RUBY_MARK_ENTER("binding");
    if (ptr) {
bind = ptr;
RUBY_MARK_UNLESS_NULL(bind->env);
RUBY_MARK_UNLESS_NULL(bind->path);
    }
    RUBY_MARK_LEAVE("binding");
}

static size_t
binding_memsize(const void *ptr)
{
    return ptr ? sizeof(rb_binding_t) : 0;
}

static const rb_data_type_t binding_data_type = {
    "binding",
    {
binding_mark,
binding_free,
binding_memsize,
    },
};

static VALUE
binding_alloc(VALUE klass)
{
    VALUE obj;
    rb_binding_t *bind;
    obj = TypedData_Make_Struct(klass, rb_binding_t, &binding_data_type, bind);
    return obj;
}

/* :nodoc: */
static VALUE
binding_dup(VALUE self)
{
    VALUE bindval = binding_alloc(rb_cBinding);
    rb_binding_t *src, *dst;
    GetBindingPtr(self, src);
    GetBindingPtr(bindval, dst);
    dst->env = src->env;
    dst->path = src->path;
    dst->first_lineno = src->first_lineno;
    return bindval;
}

/* :nodoc: */
static VALUE
binding_clone(VALUE self)
{
    VALUE bindval = binding_dup(self);
    CLONESETUP(bindval, self);
    return bindval;
}

VALUE
rb_binding_new_with_cfp(rb_thread_t *th, rb_control_frame_t *src_cfp)
{
    rb_control_frame_t *cfp = rb_vm_get_ruby_level_next_cfp(th, src_cfp);
    VALUE bindval = binding_alloc(rb_cBinding);
    rb_binding_t *bind;

    if (cfp == 0) {
rb_raise(rb_eRuntimeError, "Can't create Binding Object on top of Fiber.");
    }

    GetBindingPtr(bindval, bind);
    bind->env = rb_vm_make_env_object(th, cfp);
    bind->path = cfp->iseq->location.path;
    bind->first_lineno = rb_vm_get_sourceline(cfp);
    return bindval;
}

VALUE
rb_binding_new(void)
{
    rb_thread_t *th = GET_THREAD();
    return rb_binding_new_with_cfp(th, th->cfp);
}

/*
* call-seq:
* binding -> a_binding
*
* Returns a +Binding+ object, describing the variable and
* method bindings at the point of call. This object can be used when
* calling +eval+ to execute the evaluated command in this
* environment. See also the description of class +Binding+.
*
* def get_binding(param)
* return binding
* end
* b = get_binding("hello")
* eval("param", b) #=> "hello"
*/

static VALUE
rb_f_binding(VALUE self)
{
    return rb_binding_new();
}

/*
* call-seq:
* binding.eval(string [, filename [,lineno]]) -> obj
*
* Evaluates the Ruby expression(s) in <em>string</em>, in the
* <em>binding</em>'s context. If the optional <em>filename</em> and
* <em>lineno</em> parameters are present, they will be used when
* reporting syntax errors.
*
* def get_binding(param)
* return binding
* end
* b = get_binding("hello")
* b.eval("param") #=> "hello"
*/

static VALUE
bind_eval(int argc, VALUE *argv, VALUE bindval)
{
    VALUE args[4];

    rb_scan_args(argc, argv, "12", &args[0], &args[2], &args[3]);
    args[1] = bindval;
    return rb_f_eval(argc+1, args, Qnil /* self will be searched in eval */);
}

static VALUE
proc_new(VALUE klass, int is_lambda)
{
    VALUE procval = Qnil;
    rb_thread_t *th = GET_THREAD();
    rb_control_frame_t *cfp = th->cfp;
    rb_block_t *block;

    if ((block = rb_vm_control_frame_block_ptr(cfp)) != 0) {
/* block found */
    }
    else {
cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);

if ((block = rb_vm_control_frame_block_ptr(cfp)) != 0) {
if (is_lambda) {
rb_warn("tried to create Proc object without a block");
}
}
else {
rb_raise(rb_eArgError,
"tried to create Proc object without a block");
}
    }

    procval = block->proc;

    if (procval) {
if (RBASIC(procval)->klass == klass) {
return procval;
}
else {
VALUE newprocval = proc_dup(procval);
RBASIC(newprocval)->klass = klass;
return newprocval;
}
    }

    procval = rb_vm_make_proc(th, block, klass);
    rb_vm_rewrite_ep_in_errinfo(th, cfp);

    if (is_lambda) {
rb_proc_t *proc;
GetProcPtr(procval, proc);
proc->is_lambda = TRUE;
    }
    return procval;
}

/*
* call-seq:
* Proc.new {|...| block } -> a_proc
* Proc.new -> a_proc
*
* Creates a new <code>Proc</code> object, bound to the current
* context. <code>Proc::new</code> may be called without a block only
* within a method with an attached block, in which case that block is
* converted to the <code>Proc</code> object.
*
* def proc_from
* Proc.new
* end
* proc = proc_from { "hello" }
* proc.call #=> "hello"
*/

static VALUE
rb_proc_s_new(int argc, VALUE *argv, VALUE klass)
{
    VALUE block = proc_new(klass, FALSE);

    rb_obj_call_init(block, argc, argv);
    return block;
}

/*
* call-seq:
* proc { |...| block } -> a_proc
*
* Equivalent to <code>Proc.new</code>.
*/

VALUE
rb_block_proc(void)
{
    return proc_new(rb_cProc, FALSE);
}

VALUE
rb_block_lambda(void)
{
    return proc_new(rb_cProc, TRUE);
}

VALUE
rb_f_lambda(void)
{
    rb_warn("rb_f_lambda() is deprecated; use rb_block_proc() instead");
    return rb_block_lambda();
}

/*
* call-seq:
* lambda { |...| block } -> a_proc
*
* Equivalent to <code>Proc.new</code>, except the resulting Proc objects
* check the number of parameters passed when called.
*/

static VALUE
proc_lambda(void)
{
    return rb_block_lambda();
}

/* Document-method: ===
*
* call-seq:
* proc === obj -> result_of_proc
*
* Invokes the block with +obj+ as the proc's parameter like Proc#call. It
* is to allow a proc object to be a target of +when+ clause in a case
* statement.
*/

/* CHECKME: are the argument checking semantics correct? */

/*
* call-seq:
* prc.call(params,...) -> obj
* prc[params,...] -> obj
* prc.(params,...) -> obj
*
* Invokes the block, setting the block's parameters to the values in
* <i>params</i> using something close to method calling semantics.
* Generates a warning if multiple values are passed to a proc that
* expects just one (previously this silently converted the parameters
* to an array). Note that prc.() invokes prc.call() with the parameters
* given. It's a syntax sugar to hide "call".
*
* For procs created using <code>lambda</code> or <code>->()</code> an error
* is generated if the wrong number of parameters are passed to a Proc with
* multiple parameters. For procs created using <code>Proc.new</code> or
* <code>Kernel.proc</code>, extra parameters are silently discarded.
*
* Returns the value of the last expression evaluated in the block. See
* also <code>Proc#yield</code>.
*
* a_proc = Proc.new {|a, *b| b.collect {|i| i*a }}
* a_proc.call(9, 1, 2, 3) #=> [9, 18, 27]
* a_proc[9, 1, 2, 3] #=> [9, 18, 27]
* a_proc = lambda {|a,b| a}
* a_proc.call(1,2,3)
*
* <em>produces:</em>
*
* prog.rb:4:in `block in <main>': wrong number of arguments (3 for 2) (ArgumentError)
* from prog.rb:5:in `call'
* from prog.rb:5:in `<main>'
*
*/

static VALUE
proc_call(int argc, VALUE *argv, VALUE procval)
{
    VALUE vret;
    rb_proc_t *proc;
    rb_block_t *blockptr = 0;
    rb_iseq_t *iseq;
    VALUE passed_procval;
    GetProcPtr(procval, proc);

    iseq = proc->block.iseq;
    if (BUILTIN_TYPE(iseq) == T_NODE || iseq->arg_block != -1) {
if (rb_block_given_p()) {
rb_proc_t *passed_proc;
RB_GC_GUARD(passed_procval) = rb_block_proc();
GetProcPtr(passed_procval, passed_proc);
blockptr = &passed_proc->block;
}
    }

    vret = rb_vm_invoke_proc(GET_THREAD(), proc, argc, argv, blockptr);
    RB_GC_GUARD(procval);
    return vret;
}

#if SIZEOF_LONG > SIZEOF_INT
static inline int
check_argc(long argc)
{
    if (argc > INT_MAX || argc < 0) {
rb_raise(rb_eArgError, "too many arguments (%lu)",
(unsigned long)argc);
    }
    return (int)argc;
}
#else
#define check_argc(argc) (argc)
#endif

VALUE
rb_proc_call(VALUE self, VALUE args)
{
    VALUE vret;
    rb_proc_t *proc;
    GetProcPtr(self, proc);
    vret = rb_vm_invoke_proc(GET_THREAD(), proc,
check_argc(RARRAY_LEN(args)), RARRAY_PTR(args), 0);
    RB_GC_GUARD(self);
    RB_GC_GUARD(args);
    return vret;
}

VALUE
rb_proc_call_with_block(VALUE self, int argc, VALUE *argv, VALUE pass_procval)
{
    VALUE vret;
    rb_proc_t *proc;
    rb_block_t *block = 0;
    GetProcPtr(self, proc);

    if (!NIL_P(pass_procval)) {
rb_proc_t *pass_proc;
GetProcPtr(pass_procval, pass_proc);
block = &pass_proc->block;
    }

    vret = rb_vm_invoke_proc(GET_THREAD(), proc, argc, argv, block);
    RB_GC_GUARD(self);
    RB_GC_GUARD(pass_procval);
    return vret;
}

/*
* call-seq:
* prc.arity -> fixnum
*
* Returns the number of arguments that would not be ignored. If the block
* is declared to take no arguments, returns 0. If the block is known
* to take exactly n arguments, returns n. If the block has optional
* arguments, return -n-1, where n is the number of mandatory
* arguments. A <code>proc</code> with no argument declarations
* is the same a block declaring <code>||</code> as its arguments.
*
* proc {}.arity #=> 0
* proc {||}.arity #=> 0
* proc {|a|}.arity #=> 1
* proc {|a,b|}.arity #=> 2
* proc {|a,b,c|}.arity #=> 3
* proc {|*a|}.arity #=> -1
* proc {|a,*b|}.arity #=> -2
* proc {|a,*b, c|}.arity #=> -3
*
* proc { |x = 0| }.arity #=> 0
* lambda { |a = 0| }.arity #=> -1
* proc { |x=0, y| }.arity #=> 0
* lambda { |x=0, y| }.arity #=> -2
* proc { |x=0, y=0| }.arity #=> 0
* lambda { |x=0, y=0| }.arity #=> -1
* proc { |x, y=0| }.arity #=> 1
* lambda { |x, y=0| }.arity #=> -2
* proc { |(x, y), z=0| }.arity #=> 1
* lambda { |(x, y), z=0| }.arity #=> -2
*/

static VALUE
proc_arity(VALUE self)
{
    int arity = rb_proc_arity(self);
    return INT2FIX(arity);
}

int
rb_proc_arity(VALUE self)
{
    rb_proc_t *proc;
    rb_iseq_t *iseq;
    GetProcPtr(self, proc);
    iseq = proc->block.iseq;
    if (iseq) {
if (BUILTIN_TYPE(iseq) != T_NODE) {
if (iseq->arg_rest < 0 && (!proc->is_lambda || iseq->arg_opts == 0)) {
return iseq->argc;
}
else {
return -(iseq->argc + 1 + iseq->arg_post_len);
}
}
else {
NODE *node = (NODE *)iseq;
if (IS_METHOD_PROC_NODE(node)) {
/* method(:foo).to_proc.arity */
return method_arity(node->nd_tval);
}
}
    }
    return -1;
}

#define get_proc_iseq rb_proc_get_iseq

rb_iseq_t *
rb_proc_get_iseq(VALUE self, int *is_proc)
{
    rb_proc_t *proc;
    rb_iseq_t *iseq;

    GetProcPtr(self, proc);
    iseq = proc->block.iseq;
    if (is_proc) *is_proc = !proc->is_lambda;
    if (!RUBY_VM_NORMAL_ISEQ_P(iseq)) {
NODE *node = (NODE *)iseq;
iseq = 0;
if (IS_METHOD_PROC_NODE(node)) {
/* method(:foo).to_proc */
iseq = rb_method_get_iseq(node->nd_tval);
if (is_proc) *is_proc = 0;
}
    }
    return iseq;
}

static VALUE
iseq_location(rb_iseq_t *iseq)
{
    VALUE loc[2];

    if (!iseq) return Qnil;
    loc[0] = iseq->location.path;
    if (iseq->line_info_table) {
loc[1] = INT2FIX(rb_iseq_first_lineno(iseq));
    }
    else {
loc[1] = Qnil;
    }
    return rb_ary_new4(2, loc);
}

/*
* call-seq:
* prc.source_location -> [String, Fixnum]
*
* Returns the Ruby source filename and line number containing this proc
* or +nil+ if this proc was not defined in Ruby (i.e. native)
*/

VALUE
rb_proc_location(VALUE self)
{
    return iseq_location(get_proc_iseq(self, 0));
}

static VALUE
unnamed_parameters(int arity)
{
    VALUE a, param = rb_ary_new2((arity < 0) ? -arity : arity);
    int n = (arity < 0) ? ~arity : arity;
    ID req, rest;
    CONST_ID(req, "req");
    a = rb_ary_new3(1, ID2SYM(req));
    OBJ_FREEZE(a);
    for (; n; --n) {
rb_ary_push(param, a);
    }
    if (arity < 0) {
CONST_ID(rest, "rest");
rb_ary_store(param, ~arity, rb_ary_new3(1, ID2SYM(rest)));
    }
    return param;
}

/*
* call-seq:
* prc.parameters -> array
*
* Returns the parameter information of this proc.
*
* prc = lambda{|x, y=42, *other|}
* prc.parameters #=> [[:req, :x], [:opt, :y], [:rest, :other]]
*/

static VALUE
rb_proc_parameters(VALUE self)
{
    int is_proc;
    rb_iseq_t *iseq = get_proc_iseq(self, &is_proc);
    if (!iseq) {
return unnamed_parameters(rb_proc_arity(self));
    }
    return rb_iseq_parameters(iseq, is_proc);
}

/*
* call-seq:
* prc == other_proc -> true or false
*
* Returns <code>true</code> if <i>prc</i> is the same object as
* <i>other_proc</i>, or if they are both procs with the same body.
*/

static VALUE
proc_eq(VALUE self, VALUE other)
{
    if (self == other) {
return Qtrue;
    }
    else {
if (rb_obj_is_proc(other)) {
rb_proc_t *p1, *p2;
GetProcPtr(self, p1);
GetProcPtr(other, p2);
if (p1->envval == p2->envval &&
p1->block.iseq->iseq_size == p2->block.iseq->iseq_size &&
p1->block.iseq->local_size == p2->block.iseq->local_size &&
MEMCMP(p1->block.iseq->iseq, p2->block.iseq->iseq, VALUE,
p1->block.iseq->iseq_size) == 0) {
return Qtrue;
}
}
    }
    return Qfalse;
}

st_index_t
rb_hash_proc(st_index_t hash, VALUE prc)
{
    rb_proc_t *proc;
    GetProcPtr(prc, proc);
    hash = rb_hash_uint(hash, (st_index_t)proc->block.iseq);
    hash = rb_hash_uint(hash, (st_index_t)proc->envval);
    return rb_hash_uint(hash, (st_index_t)proc->block.ep >> 16);
}

/*
* call-seq:
* prc.hash -> integer
*
* Returns a hash value corresponding to proc body.
*/

static VALUE
proc_hash(VALUE self)
{
    st_index_t hash;
    hash = rb_hash_start(0);
    hash = rb_hash_proc(hash, self);
    hash = rb_hash_end(hash);
    return LONG2FIX(hash);
}

/*
* call-seq:
* prc.to_s -> string
*
* Returns the unique identifier for this proc, along with
* an indication of where the proc was defined.
*/

static VALUE
proc_to_s(VALUE self)
{
    VALUE str = 0;
    rb_proc_t *proc;
    const char *cname = rb_obj_classname(self);
    rb_iseq_t *iseq;
    const char *is_lambda;

    GetProcPtr(self, proc);
    iseq = proc->block.iseq;
    is_lambda = proc->is_lambda ? " (lambda)" : "";

    if (RUBY_VM_NORMAL_ISEQ_P(iseq)) {
int first_lineno = 0;

if (iseq->line_info_table) {
first_lineno = rb_iseq_first_lineno(iseq);
}
str = rb_sprintf("#<%s:%p@%s:%d%s>", cname, (void *)self,
RSTRING_PTR(iseq->location.path),
first_lineno, is_lambda);
    }
    else {
str = rb_sprintf("#<%s:%p%s>", cname, (void *)proc->block.iseq,
is_lambda);
    }

    if (OBJ_TAINTED(self)) {
OBJ_TAINT(str);
    }
    return str;
}

/*
* call-seq:
* prc.to_proc -> prc
*
* Part of the protocol for converting objects to <code>Proc</code>
* objects. Instances of class <code>Proc</code> simply return
* themselves.
*/

static VALUE
proc_to_proc(VALUE self)
{
    return self;
}

static void
bm_mark(void *ptr)
{
    struct METHOD *data = ptr;
    rb_gc_mark(data->defined_class);
    rb_gc_mark(data->rclass);
    rb_gc_mark(data->recv);
    if (data->me) rb_mark_method_entry(data->me);
}

static void
bm_free(void *ptr)
{
    struct METHOD *data = ptr;
    struct unlinked_method_entry_list_entry *ume = data->ume;
    ume->me = data->me;
    ume->next = GET_VM()->unlinked_method_entry_list;
    GET_VM()->unlinked_method_entry_list = ume;
    xfree(ptr);
}

static size_t
bm_memsize(const void *ptr)
{
    return ptr ? sizeof(struct METHOD) : 0;
}

static const rb_data_type_t method_data_type = {
    "method",
    {
bm_mark,
bm_free,
bm_memsize,
    },
};

VALUE
rb_obj_is_method(VALUE m)
{
    if (rb_typeddata_is_kind_of(m, &method_data_type)) {
return Qtrue;
    }
    else {
return Qfalse;
    }
}

static VALUE
mnew(VALUE klass, VALUE obj, ID id, VALUE mclass, int scope)
{
    VALUE method;
    VALUE rclass = klass, defined_class;
    ID rid = id;
    struct METHOD *data;
    rb_method_entry_t *me, meb;
    rb_method_definition_t *def = 0;
    rb_method_flag_t flag = NOEX_UNDEF;

  again:
    me = rb_method_entry(klass, id, &defined_class);
    if (UNDEFINED_METHOD_ENTRY_P(me)) {
ID rmiss = rb_intern("respond_to_missing?");
VALUE sym = ID2SYM(id);

if (obj != Qundef && !rb_method_basic_definition_p(klass, rmiss)) {
if (RTEST(rb_funcall(obj, rmiss, 2, sym, scope ? Qfalse : Qtrue))) {
def = ALLOC(rb_method_definition_t);
def->type = VM_METHOD_TYPE_MISSING;
def->original_id = id;
def->alias_count = 0;

meb.flag = 0;
meb.mark = 0;
meb.called_id = id;
meb.klass = klass;
meb.def = def;
me = &meb;
def = 0;

goto gen_method;
}
}
rb_print_undef(klass, id, 0);
    }
    def = me->def;
    if (flag == NOEX_UNDEF) {
flag = me->flag;
if (scope && (flag & NOEX_MASK) != NOEX_PUBLIC) {
const char *v = "";
switch (flag & NOEX_MASK) {
case NOEX_PRIVATE: v = "private"; break;
case NOEX_PROTECTED: v = "protected"; break;
}
rb_name_error(id, "method `%s' for %s `%s' is %s",
rb_id2name(id),
(RB_TYPE_P(klass, T_MODULE)) ? "module" : "class",
rb_class2name(klass),
v);
}
    }
    if (def && def->type == VM_METHOD_TYPE_ZSUPER) {
klass = RCLASS_SUPER(defined_class);
id = def->original_id;
goto again;
    }

    klass = defined_class;

    while (rclass != klass &&
(FL_TEST(rclass, FL_SINGLETON) || RB_TYPE_P(rclass, T_ICLASS))) {
rclass = RCLASS_SUPER(rclass);
    }

    if (RB_TYPE_P(klass, T_ICLASS)) {
klass = RBASIC(klass)->klass;
    }

  gen_method:
    method = TypedData_Make_Struct(mclass, struct METHOD, &method_data_type, data);

    data->recv = obj;
    data->rclass = rclass;
    data->defined_class = defined_class;
    data->id = rid;
    data->me = ALLOC(rb_method_entry_t);
    *data->me = *me;
    data->me->def->alias_count++;
    data->ume = ALLOC(struct unlinked_method_entry_list_entry);

    OBJ_INFECT(method, klass);

    return method;
}


/**********************************************************************
*
* Document-class : Method
*
* Method objects are created by <code>Object#method</code>, and are
* associated with a particular object (not just with a class). They
* may be used to invoke the method within the object, and as a block
* associated with an iterator. They may also be unbound from one
* object (creating an <code>UnboundMethod</code>) and bound to
* another.
*
* class Thing
* def square(n)
* n*n
* end
* end
* thing = Thing.new
* meth = thing.method(:square)
*
* meth.call(9) #=> 81
* [ 1, 2, 3 ].collect(&meth) #=> [1, 4, 9]
*
*/

/*
* call-seq:
* meth == other_meth -> true or false
*
* Two method objects are equal if they are bound to the same
* object and refer to the same method definition.
*/

static VALUE
method_eq(VALUE method, VALUE other)
{
    struct METHOD *m1, *m2;

    if (!rb_obj_is_method(other))
return Qfalse;
    if (CLASS_OF(method) != CLASS_OF(other))
return Qfalse;

    Check_TypedStruct(method, &method_data_type);
    m1 = (struct METHOD *)DATA_PTR(method);
    m2 = (struct METHOD *)DATA_PTR(other);

    if (!rb_method_entry_eq(m1->me, m2->me) ||
m1->rclass != m2->rclass ||
m1->recv != m2->recv) {
return Qfalse;
    }

    return Qtrue;
}

/*
* call-seq:
* meth.hash -> integer
*
* Returns a hash value corresponding to the method object.
*/

static VALUE
method_hash(VALUE method)
{
    struct METHOD *m;
    st_index_t hash;

    TypedData_Get_Struct(method, struct METHOD, &method_data_type, m);
    hash = rb_hash_start((st_index_t)m->rclass);
    hash = rb_hash_uint(hash, (st_index_t)m->recv);
    hash = rb_hash_method_entry(hash, m->me);
    hash = rb_hash_end(hash);

    return INT2FIX(hash);
}

/*
* call-seq:
* meth.unbind -> unbound_method
*
* Dissociates <i>meth</i> from its current receiver. The resulting
* <code>UnboundMethod</code> can subsequently be bound to a new object
* of the same class (see <code>UnboundMethod</code>).
*/

static VALUE
method_unbind(VALUE obj)
{
    VALUE method;
    struct METHOD *orig, *data;

    TypedData_Get_Struct(obj, struct METHOD, &method_data_type, orig);
    method = TypedData_Make_Struct(rb_cUnboundMethod, struct METHOD,
&method_data_type, data);
    data->recv = Qundef;
    data->id = orig->id;
    data->me = ALLOC(rb_method_entry_t);
    *data->me = *orig->me;
    if (orig->me->def) orig->me->def->alias_count++;
    data->rclass = orig->rclass;
    data->defined_class = orig->defined_class;
    data->ume = ALLOC(struct unlinked_method_entry_list_entry);
    OBJ_INFECT(method, obj);

    return method;
}

/*
* call-seq:
* meth.receiver -> object
*
* Returns the bound receiver of the method object.
*/

static VALUE
method_receiver(VALUE obj)
{
    struct METHOD *data;

    TypedData_Get_Struct(obj, struct METHOD, &method_data_type, data);
    return data->recv;
}

/*
* call-seq:
* meth.name -> symbol
*
* Returns the name of the method.
*/

static VALUE
method_name(VALUE obj)
{
    struct METHOD *data;

    TypedData_Get_Struct(obj, struct METHOD, &method_data_type, data);
    return ID2SYM(data->id);
}

/*
* call-seq:
* meth.owner -> class_or_module
*
* Returns the class or module that defines the method.
*/

static VALUE
method_owner(VALUE obj)
{
    struct METHOD *data;

    TypedData_Get_Struct(obj, struct METHOD, &method_data_type, data);
    return data->me->klass;
}

void
rb_method_name_error(VALUE klass, VALUE str)
{
    const char *s0 = " class";
    VALUE c = klass;

    if (FL_TEST(c, FL_SINGLETON)) {
VALUE obj = rb_ivar_get(klass, attached);

switch (TYPE(obj)) {
case T_MODULE:
case T_CLASS:
c = obj;
s0 = "";
}
    }
    else if (RB_TYPE_P(c, T_MODULE)) {
s0 = " module";
    }
    rb_name_error_str(str, "undefined method `%s' for%s `%s'",
RSTRING_PTR(str), s0, rb_class2name(c));
}

/*
* call-seq:
* obj.method(sym) -> method
*
* Looks up the named method as a receiver in <i>obj</i>, returning a
* <code>Method</code> object (or raising <code>NameError</code>). The
* <code>Method</code> object acts as a closure in <i>obj</i>'s object
* instance, so instance variables and the value of <code>self</code>
* remain available.
*
* class Demo
* def initialize(n)
* @iv = n
* end
* def hello()
* "Hello, @iv = #{@iv}"
* end
* end
*
* k = Demo.new(99)
* m = k.method(:hello)
* m.call #=> "Hello, @iv = 99"
*
* l = Demo.new('Fred')
* m = l.method("hello")
* m.call #=> "Hello, @iv = Fred"
*/

VALUE
rb_obj_method(VALUE obj, VALUE vid)
{
    ID id = rb_check_id(&vid);
    if (!id) {
rb_method_name_error(CLASS_OF(obj), vid);
    }
    return mnew(CLASS_OF(obj), obj, id, rb_cMethod, FALSE);
}

/*
* call-seq:
* obj.public_method(sym) -> method
*
* Similar to _method_, searches public method only.
*/

VALUE
rb_obj_public_method(VALUE obj, VALUE vid)
{
    ID id = rb_check_id(&vid);
    if (!id) {
rb_method_name_error(CLASS_OF(obj), vid);
    }
    return mnew(CLASS_OF(obj), obj, id, rb_cMethod, TRUE);
}

/*
* call-seq:
* mod.instance_method(symbol) -> unbound_method
*
* Returns an +UnboundMethod+ representing the given
* instance method in _mod_.
*
* class Interpreter
* def do_a() print "there, "; end
* def do_d() print "Hello "; end
* def do_e() print "!\n"; end
* def do_v() print "Dave"; end
* Dispatcher = {
* "a" => instance_method(:do_a),
* "d" => instance_method(:do_d),
* "e" => instance_method(:do_e),
* "v" => instance_method(:do_v)
* }
* def interpret(string)
* string.each_char {|b| Dispatcher[b].bind(self).call }
* end
* end
*
* interpreter = Interpreter.new
* interpreter.interpret('dave')
*
* <em>produces:</em>
*
* Hello there, Dave!
*/

static VALUE
rb_mod_instance_method(VALUE mod, VALUE vid)
{
    ID id = rb_check_id(&vid);
    if (!id) {
rb_method_name_error(mod, vid);
    }
    return mnew(mod, Qundef, id, rb_cUnboundMethod, FALSE);
}

/*
* call-seq:
* mod.public_instance_method(symbol) -> unbound_method
*
* Similar to _instance_method_, searches public method only.
*/

static VALUE
rb_mod_public_instance_method(VALUE mod, VALUE vid)
{
    ID id = rb_check_id(&vid);
    if (!id) {
rb_method_name_error(mod, vid);
    }
    return mnew(mod, Qundef, id, rb_cUnboundMethod, TRUE);
}

/*
* call-seq:
* define_method(symbol, method) -> new_method
* define_method(symbol) { block } -> proc
*
* Defines an instance method in the receiver. The _method_
* parameter can be a +Proc+, a +Method+ or an +UnboundMethod+ object.
* If a block is specified, it is used as the method body. This block
* is evaluated using <code>instance_eval</code>, a point that is
* tricky to demonstrate because <code>define_method</code> is private.
* (This is why we resort to the +send+ hack in this example.)
*
* class A
* def fred
* puts "In Fred"
* end
* def create_method(name, &block)
* self.class.send(:define_method, name, &block)
* end
* define_method(:wilma) { puts "Charge it!" }
* end
* class B < A
* define_method(:barney, instance_method(:fred))
* end
* a = B.new
* a.barney
* a.wilma
* a.create_method(:betty) { p self }
* a.betty
*
* <em>produces:</em>
*
* In Fred
* Charge it!
* #<B:0x401b39e8>
*/

static VALUE
rb_mod_define_method(int argc, VALUE *argv, VALUE mod)
{
    ID id;
    VALUE body;
    int noex = NOEX_PUBLIC;

    if (argc == 1) {
id = rb_to_id(argv[0]);
body = rb_block_lambda();
    }
    else {
rb_check_arity(argc, 1, 2);
id = rb_to_id(argv[0]);
body = argv[1];
if (!rb_obj_is_method(body) && !rb_obj_is_proc(body)) {
rb_raise(rb_eTypeError,
"wrong argument type %s (expected Proc/Method)",
rb_obj_classname(body));
}
    }

    if (rb_obj_is_method(body)) {
struct METHOD *method = (struct METHOD *)DATA_PTR(body);
VALUE rclass = method->rclass;
if (rclass != mod && !RB_TYPE_P(rclass, T_MODULE) &&
!RTEST(rb_class_inherited_p(mod, rclass))) {
if (FL_TEST(rclass, FL_SINGLETON)) {
rb_raise(rb_eTypeError,
"can't bind singleton method to a different class");
}
else {
rb_raise(rb_eTypeError,
"bind argument must be a subclass of %s",
rb_class2name(rclass));
}
}
rb_method_entry_set(mod, id, method->me, noex);
    }
    else if (rb_obj_is_proc(body)) {
rb_proc_t *proc;
body = proc_dup(body);
GetProcPtr(body, proc);
if (BUILTIN_TYPE(proc->block.iseq) != T_NODE) {
proc->block.iseq->defined_method_id = id;
proc->block.iseq->klass = mod;
proc->is_lambda = TRUE;
proc->is_from_method = TRUE;
proc->block.klass = mod;
}
rb_add_method(mod, id, VM_METHOD_TYPE_BMETHOD, (void *)body, noex);
    }
    else {
/* type error */
rb_raise(rb_eTypeError, "wrong argument type (expected Proc/Method)");
    }

    return body;
}

/*
* call-seq:
* define_singleton_method(symbol, method) -> new_method
* define_singleton_method(symbol) { block } -> proc
*
* Defines a singleton method in the receiver. The _method_
* parameter can be a +Proc+, a +Method+ or an +UnboundMethod+ object.
* If a block is specified, it is used as the method body.
*
* class A
* class << self
* def class_name
* to_s
* end
* end
* end
* A.define_singleton_method(:who_am_i) do
* "I am: #{class_name}"
* end
* A.who_am_i # ==> "I am: A"
*
* guy = "Bob"
* guy.define_singleton_method(:hello) { "#{self}: Hello there!" }
* guy.hello #=> "Bob: Hello there!"
*/

static VALUE
rb_obj_define_method(int argc, VALUE *argv, VALUE obj)
{
    VALUE klass = rb_singleton_class(obj);

    return rb_mod_define_method(argc, argv, klass);
}

/*
* call-seq:
* method.clone -> new_method
*
* Returns a clone of this method.
*
* class A
* def foo
* return "bar"
* end
* end
*
* m = A.new.method(:foo)
* m.call # => "bar"
* n = m.clone.call # => "bar"
*/

static VALUE
method_clone(VALUE self)
{
    VALUE clone;
    struct METHOD *orig, *data;

    TypedData_Get_Struct(self, struct METHOD, &method_data_type, orig);
    clone = TypedData_Make_Struct(CLASS_OF(self), struct METHOD, &method_data_type, data);
    CLONESETUP(clone, self);
    *data = *orig;
    data->me = ALLOC(rb_method_entry_t);
    *data->me = *orig->me;
    if (data->me->def) data->me->def->alias_count++;
    data->ume = ALLOC(struct unlinked_method_entry_list_entry);

    return clone;
}

/*
* call-seq:
* meth.call(args, ...) -> obj
* meth[args, ...] -> obj
*
* Invokes the <i>meth</i> with the specified arguments, returning the
* method's return value.
*
* m = 12.method("+")
* m.call(3) #=> 15
* m.call(20) #=> 32
*/

VALUE
rb_method_call(int argc, VALUE *argv, VALUE method)
{
    VALUE result = Qnil; /* OK */
    struct METHOD *data;
    int state;
    volatile int safe = -1;

    TypedData_Get_Struct(method, struct METHOD, &method_data_type, data);
    if (data->recv == Qundef) {
rb_raise(rb_eTypeError, "can't call unbound method; bind first");
    }
    PUSH_TAG();
    if (OBJ_TAINTED(method)) {
safe = rb_safe_level();
if (rb_safe_level() < 4) {
rb_set_safe_level_force(4);
}
    }
    if ((state = EXEC_TAG()) == 0) {
rb_thread_t *th = GET_THREAD();

PASS_PASSED_BLOCK_TH(th);
result = rb_vm_call(th, data->recv, data->id, argc, argv, data->me, data->defined_class);
    }
    POP_TAG();
    if (safe >= 0)
rb_set_safe_level_force(safe);
    if (state)
JUMP_TAG(state);
    return result;
}

/**********************************************************************
*
* Document-class: UnboundMethod
*
* Ruby supports two forms of objectified methods. Class
* <code>Method</code> is used to represent methods that are associated
* with a particular object: these method objects are bound to that
* object. Bound method objects for an object can be created using
* <code>Object#method</code>.
*
* Ruby also supports unbound methods; methods objects that are not
* associated with a particular object. These can be created either by
* calling <code>Module#instance_method</code> or by calling
* <code>unbind</code> on a bound method object. The result of both of
* these is an <code>UnboundMethod</code> object.
*
* Unbound methods can only be called after they are bound to an
* object. That object must be be a kind_of? the method's original
* class.
*
* class Square
* def area
* @side * @side
* end
* def initialize(side)
* @side = side
* end
* end
*
* area_un = Square.instance_method(:area)
*
* s = Square.new(12)
* area = area_un.bind(s)
* area.call #=> 144
*
* Unbound methods are a reference to the method at the time it was
* objectified: subsequent changes to the underlying class will not
* affect the unbound method.
*
* class Test
* def test
* :original
* end
* end
* um = Test.instance_method(:test)
* class Test
* def test
* :modified
* end
* end
* t = Test.new
* t.test #=> :modified
* um.bind(t).call #=> :original
*
*/

/*
* call-seq:
* umeth.bind(obj) -> method
*
* Bind <i>umeth</i> to <i>obj</i>. If <code>Klass</code> was the class
* from which <i>umeth</i> was obtained,
* <code>obj.kind_of?(Klass)</code> must be true.
*
* class A
* def test
* puts "In test, class = #{self.class}"
* end
* end
* class B < A
* end
* class C < B
* end
*
*
* um = B.instance_method(:test)
* bm = um.bind(C.new)
* bm.call
* bm = um.bind(B.new)
* bm.call
* bm = um.bind(A.new)
* bm.call
*
* <em>produces:</em>
*
* In test, class = C
* In test, class = B
* prog.rb:16:in `bind': bind argument must be an instance of B (TypeError)
* from prog.rb:16
*/

static VALUE
umethod_bind(VALUE method, VALUE recv)
{
    struct METHOD *data, *bound;

    TypedData_Get_Struct(method, struct METHOD, &method_data_type, data);

    if (data->rclass != CLASS_OF(recv) && !rb_obj_is_kind_of(recv, data->rclass)) {
if (FL_TEST(data->rclass, FL_SINGLETON)) {
rb_raise(rb_eTypeError,
"singleton method called for a different object");
}
else {
rb_raise(rb_eTypeError, "bind argument must be an instance of %s",
rb_class2name(data->rclass));
}
    }

    method = TypedData_Make_Struct(rb_cMethod, struct METHOD, &method_data_type, bound);
    *bound = *data;
    bound->me = ALLOC(rb_method_entry_t);
    *bound->me = *data->me;
    if (bound->me->def) bound->me->def->alias_count++;
    bound->recv = recv;
    bound->rclass = CLASS_OF(recv);
    data->ume = ALLOC(struct unlinked_method_entry_list_entry);

    return method;
}

int
rb_method_entry_arity(const rb_method_entry_t *me)
{
    const rb_method_definition_t *def = me->def;
    if (!def) return 0;
    switch (def->type) {
      case VM_METHOD_TYPE_CFUNC:
if (def->body.cfunc.argc < 0)
return -1;
return check_argc(def->body.cfunc.argc);
      case VM_METHOD_TYPE_ZSUPER:
return -1;
      case VM_METHOD_TYPE_ATTRSET:
return 1;
      case VM_METHOD_TYPE_IVAR:
return 0;
      case VM_METHOD_TYPE_BMETHOD:
return rb_proc_arity(def->body.proc);
      case VM_METHOD_TYPE_ISEQ: {
rb_iseq_t *iseq = def->body.iseq;
if (iseq->arg_rest == -1 && iseq->arg_opts == 0) {
return iseq->argc;
}
else {
return -(iseq->argc + 1 + iseq->arg_post_len);
}
      }
      case VM_METHOD_TYPE_UNDEF:
      case VM_METHOD_TYPE_NOTIMPLEMENTED:
return 0;
      case VM_METHOD_TYPE_MISSING:
return -1;
      case VM_METHOD_TYPE_OPTIMIZED: {
switch (def->body.optimize_type) {
case OPTIMIZED_METHOD_TYPE_SEND:
return -1;
default:
break;
}
      }
    }
    rb_bug("rb_method_entry_arity: invalid method entry type (%d)", def->type);

    UNREACHABLE;
}

/*
* call-seq:
* meth.arity -> fixnum
*
* Returns an indication of the number of arguments accepted by a
* method. Returns a nonnegative integer for methods that take a fixed
* number of arguments. For Ruby methods that take a variable number of
* arguments, returns -n-1, where n is the number of required
* arguments. For methods written in C, returns -1 if the call takes a
* variable number of arguments.
*
* class C
* def one; end
* def two(a); end
* def three(*a); end
* def four(a, b); end
* def five(a, b, *c); end
* def six(a, b, *c, &d); end
* end
* c = C.new
* c.method(:one).arity #=> 0
* c.method(:two).arity #=> 1
* c.method(:three).arity #=> -1
* c.method(:four).arity #=> 2
* c.method(:five).arity #=> -3
* c.method(:six).arity #=> -3
*
* "cat".method(:size).arity #=> 0
* "cat".method(:replace).arity #=> 1
* "cat".method(:squeeze).arity #=> -1
* "cat".method(:count).arity #=> -1
*/

static VALUE
method_arity_m(VALUE method)
{
    int n = method_arity(method);
    return INT2FIX(n);
}

static int
method_arity(VALUE method)
{
    struct METHOD *data;

    TypedData_Get_Struct(method, struct METHOD, &method_data_type, data);
    return rb_method_entry_arity(data->me);
}

int
rb_mod_method_arity(VALUE mod, ID id)
{
    rb_method_entry_t *me = rb_method_entry(mod, id, 0);
    return rb_method_entry_arity(me);
}

int
rb_obj_method_arity(VALUE obj, ID id)
{
    return rb_mod_method_arity(CLASS_OF(obj), id);
}

static inline rb_method_definition_t *
method_get_def(VALUE method)
{
    struct METHOD *data;

    TypedData_Get_Struct(method, struct METHOD, &method_data_type, data);
    return data->me->def;
}

static rb_iseq_t *
method_get_iseq(rb_method_definition_t *def)
{
    switch (def->type) {
      case VM_METHOD_TYPE_BMETHOD:
return get_proc_iseq(def->body.proc, 0);
      case VM_METHOD_TYPE_ISEQ:
return def->body.iseq;
      default:
return 0;
    }
}

rb_iseq_t *
rb_method_get_iseq(VALUE method)
{
    return method_get_iseq(method_get_def(method));
}

/*
* call-seq:
* meth.source_location -> [String, Fixnum]
*
* Returns the Ruby source filename and line number containing this method
* or nil if this method was not defined in Ruby (i.e. native)
*/

VALUE
rb_method_location(VALUE method)
{
    rb_method_definition_t *def = method_get_def(method);
    if (def->type == VM_METHOD_TYPE_ATTRSET || def->type == VM_METHOD_TYPE_IVAR) {
if (!def->body.attr.location)
return Qnil;
return rb_ary_dup(def->body.attr.location);
    }
    return iseq_location(method_get_iseq(def));
}

/*
* call-seq:
* meth.parameters -> array
*
* Returns the parameter information of this method.
*/

static VALUE
rb_method_parameters(VALUE method)
{
    rb_iseq_t *iseq = rb_method_get_iseq(method);
    if (!iseq) {
return unnamed_parameters(method_arity(method));
    }
    return rb_iseq_parameters(iseq, 0);
}

/*
* call-seq:
* meth.to_s -> string
* meth.inspect -> string
*
* Returns the name of the underlying method.
*
* "cat".method(:count).inspect #=> "#<Method: String#count>"
*/

static VALUE
method_inspect(VALUE method)
{
    struct METHOD *data;
    VALUE str;
    const char *s;
    const char *sharp = "#";

    TypedData_Get_Struct(method, struct METHOD, &method_data_type, data);
    str = rb_str_buf_new2("#<");
    s = rb_obj_classname(method);
    rb_str_buf_cat2(str, s);
    rb_str_buf_cat2(str, ": ");

    if (FL_TEST(data->me->klass, FL_SINGLETON)) {
VALUE v = rb_ivar_get(data->me->klass, attached);

if (data->recv == Qundef) {
rb_str_buf_append(str, rb_inspect(data->me->klass));
}
else if (data->recv == v) {
rb_str_buf_append(str, rb_inspect(v));
sharp = ".";
}
else {
rb_str_buf_append(str, rb_inspect(data->recv));
rb_str_buf_cat2(str, "(");
rb_str_buf_append(str, rb_inspect(v));
rb_str_buf_cat2(str, ")");
sharp = ".";
}
    }
    else {
rb_str_buf_cat2(str, rb_class2name(data->rclass));
if (data->rclass != data->me->klass) {
rb_str_buf_cat2(str, "(");
rb_str_buf_cat2(str, rb_class2name(data->me->klass));
rb_str_buf_cat2(str, ")");
}
    }
    rb_str_buf_cat2(str, sharp);
    rb_str_append(str, rb_id2str(data->me->def->original_id));
    if (data->me->def->type == VM_METHOD_TYPE_NOTIMPLEMENTED) {
        rb_str_buf_cat2(str, " (not-implemented)");
    }
    rb_str_buf_cat2(str, ">");

    return str;
}

static VALUE
mproc(VALUE method)
{
    return rb_funcall(Qnil, rb_intern("proc"), 0);
}

static VALUE
mlambda(VALUE method)
{
    return rb_funcall(Qnil, rb_intern("lambda"), 0);
}

static VALUE
bmcall(VALUE args, VALUE method)
{
    volatile VALUE a;
    VALUE ret;
    int argc;

    if (CLASS_OF(args) != rb_cArray) {
args = rb_ary_new3(1, args);
argc = 1;
    }
    else {
argc = check_argc(RARRAY_LEN(args));
    }
    ret = rb_method_call(argc, RARRAY_PTR(args), method);
    RB_GC_GUARD(a) = args;
    return ret;
}

VALUE
rb_proc_new(
    VALUE (*func)(ANYARGS), /* VALUE yieldarg[, VALUE procarg] */
    VALUE val)
{
    VALUE procval = rb_iterate(mproc, 0, func, val);
    return procval;
}

/*
* call-seq:
* meth.to_proc -> prc
*
* Returns a <code>Proc</code> object corresponding to this method.
*/

static VALUE
method_proc(VALUE method)
{
    VALUE procval;
    rb_proc_t *proc;
    /*
* class Method
* def to_proc
* proc{|*args|
* self.call(*args)
* }
* end
* end
*/
    procval = rb_iterate(mlambda, 0, bmcall, method);
    GetProcPtr(procval, proc);
    proc->is_from_method = 1;
    return procval;
}

/*
* call_seq:
* local_jump_error.exit_value -> obj
*
* Returns the exit value associated with this +LocalJumpError+.
*/
static VALUE
localjump_xvalue(VALUE exc)
{
    return rb_iv_get(exc, "@exit_value");
}

/*
* call-seq:
* local_jump_error.reason -> symbol
*
* The reason this block was terminated:
* :break, :redo, :retry, :next, :return, or :noreason.
*/

static VALUE
localjump_reason(VALUE exc)
{
    return rb_iv_get(exc, "@reason");
}

/*
* call-seq:
* prc.binding -> binding
*
* Returns the binding associated with <i>prc</i>. Note that
* <code>Kernel#eval</code> accepts either a <code>Proc</code> or a
* <code>Binding</code> object as its second parameter.
*
* def fred(param)
* proc {}
* end
*
* b = fred(99)
* eval("param", b.binding) #=> 99
*/
static VALUE
proc_binding(VALUE self)
{
    rb_proc_t *proc;
    VALUE bindval;
    rb_binding_t *bind;

    GetProcPtr(self, proc);
    if (RB_TYPE_P((VALUE)proc->block.iseq, T_NODE)) {
if (!IS_METHOD_PROC_NODE((NODE *)proc->block.iseq)) {
rb_raise(rb_eArgError, "Can't create Binding from C level Proc");
}
    }

    bindval = binding_alloc(rb_cBinding);
    GetBindingPtr(bindval, bind);
    bind->env = proc->envval;
    if (RUBY_VM_NORMAL_ISEQ_P(proc->block.iseq)) {
bind->path = proc->block.iseq->location.path;
bind->first_lineno = rb_iseq_first_lineno(proc->block.iseq);
    }
    else {
bind->path = Qnil;
bind->first_lineno = 0;
    }
    return bindval;
}

static VALUE curry(VALUE dummy, VALUE args, int argc, VALUE *argv, VALUE passed_proc);

static VALUE
make_curry_proc(VALUE proc, VALUE passed, VALUE arity)
{
    VALUE args = rb_ary_new3(3, proc, passed, arity);
    rb_proc_t *procp;
    int is_lambda;

    GetProcPtr(proc, procp);
    is_lambda = procp->is_lambda;
    rb_ary_freeze(passed);
    rb_ary_freeze(args);
    proc = rb_proc_new(curry, args);
    GetProcPtr(proc, procp);
    procp->is_lambda = is_lambda;
    return proc;
}

static VALUE
curry(VALUE dummy, VALUE args, int argc, VALUE *argv, VALUE passed_proc)
{
    VALUE proc, passed, arity;
    proc = RARRAY_PTR(args)[0];
    passed = RARRAY_PTR(args)[1];
    arity = RARRAY_PTR(args)[2];

    passed = rb_ary_plus(passed, rb_ary_new4(argc, argv));
    rb_ary_freeze(passed);

    if (RARRAY_LEN(passed) < FIX2INT(arity)) {
if (!NIL_P(passed_proc)) {
rb_warn("given block not used");
}
arity = make_curry_proc(proc, passed, arity);
return arity;
    }
    else {
return rb_proc_call_with_block(proc, check_argc(RARRAY_LEN(passed)),
RARRAY_PTR(passed), passed_proc);
    }
}

 /*
* call-seq:
* prc.curry -> a_proc
* prc.curry(arity) -> a_proc
*
* Returns a curried proc. If the optional <i>arity</i> argument is given,
* it determines the number of arguments.
* A curried proc receives some arguments. If a sufficient number of
* arguments are supplied, it passes the supplied arguments to the original
* proc and returns the result. Otherwise, returns another curried proc that
* takes the rest of arguments.
*
* b = proc {|x, y, z| (x||0) + (y||0) + (z||0) }
* p b.curry[1][2][3] #=> 6
* p b.curry[1, 2][3, 4] #=> 6
* p b.curry(5)[1][2][3][4][5] #=> 6
* p b.curry(5)[1, 2][3, 4][5] #=> 6
* p b.curry(1)[1] #=> 1
*
* b = proc {|x, y, z, *w| (x||0) + (y||0) + (z||0) + w.inject(0, &:+) }
* p b.curry[1][2][3] #=> 6
* p b.curry[1, 2][3, 4] #=> 10
* p b.curry(5)[1][2][3][4][5] #=> 15
* p b.curry(5)[1, 2][3, 4][5] #=> 15
* p b.curry(1)[1] #=> 1
*
* b = lambda {|x, y, z| (x||0) + (y||0) + (z||0) }
* p b.curry[1][2][3] #=> 6
* p b.curry[1, 2][3, 4] #=> wrong number of arguments (4 for 3)
* p b.curry(5) #=> wrong number of arguments (5 for 3)
* p b.curry(1) #=> wrong number of arguments (1 for 3)
*
* b = lambda {|x, y, z, *w| (x||0) + (y||0) + (z||0) + w.inject(0, &:+) }
* p b.curry[1][2][3] #=> 6
* p b.curry[1, 2][3, 4] #=> 10
* p b.curry(5)[1][2][3][4][5] #=> 15
* p b.curry(5)[1, 2][3, 4][5] #=> 15
* p b.curry(1) #=> wrong number of arguments (1 for 3)
*
* b = proc { :foo }
* p b.curry[] #=> :foo
*/
static VALUE
proc_curry(int argc, VALUE *argv, VALUE self)
{
    int sarity, marity = rb_proc_arity(self);
    VALUE arity, opt = Qfalse;

    if (marity < 0) {
marity = -marity - 1;
opt = Qtrue;
    }

    rb_scan_args(argc, argv, "01", &arity);
    if (NIL_P(arity)) {
arity = INT2FIX(marity);
    }
    else {
sarity = FIX2INT(arity);
if (rb_proc_lambda_p(self) && (sarity < marity || (sarity > marity && !opt))) {
rb_raise(rb_eArgError, "wrong number of arguments (%d for %d)", sarity, marity);
}
    }

    return make_curry_proc(self, rb_ary_new(), arity);
}

/*
* Document-class: LocalJumpError
*
* Raised when Ruby can't yield as requested.
*
* A typical scenario is attempting to yield when no block is given:
*
* def call_block
* yield 42
* end
* call_block
*
* <em>raises the exception:</em>
*
* LocalJumpError: no block given (yield)
*
* A more subtle example:
*
* def get_me_a_return
* Proc.new { return 42 }
* end
* get_me_a_return.call
*
* <em>raises the exception:</em>
*
* LocalJumpError: unexpected return
*/

/*
* Document-class: SystemStackError
*
* Raised in case of a stack overflow.
*
* def me_myself_and_i
* me_myself_and_i
* end
* me_myself_and_i
*
* <em>raises the exception:</em>
*
* SystemStackError: stack level too deep
*/

/*
* <code>Proc</code> objects are blocks of code that have been bound to
* a set of local variables. Once bound, the code may be called in
* different contexts and still access those variables.
*
* def gen_times(factor)
* return Proc.new {|n| n*factor }
* end
*
* times3 = gen_times(3)
* times5 = gen_times(5)
*
* times3.call(12) #=> 36
* times5.call(5) #=> 25
* times3.call(times5.call(4)) #=> 60
*
*/

void
Init_Proc(void)
{
    /* Proc */
    rb_cProc = rb_define_class("Proc", rb_cObject);
    rb_undef_alloc_func(rb_cProc);
    rb_define_singleton_method(rb_cProc, "new", rb_proc_s_new, -1);

#if 0 /* incomplete. */
    rb_add_method(rb_cProc, rb_intern("call"), VM_METHOD_TYPE_OPTIMIZED,
(void *)OPTIMIZED_METHOD_TYPE_CALL, 0);
    rb_add_method(rb_cProc, rb_intern("[]"), VM_METHOD_TYPE_OPTIMIZED,
(void *)OPTIMIZED_METHOD_TYPE_CALL, 0);
    rb_add_method(rb_cProc, rb_intern("==="), VM_METHOD_TYPE_OPTIMIZED,
(void *)OPTIMIZED_METHOD_TYPE_CALL, 0);
    rb_add_method(rb_cProc, rb_intern("yield"), VM_METHOD_TYPE_OPTIMIZED,
(void *)OPTIMIZED_METHOD_TYPE_CALL, 0);
#else
    rb_define_method(rb_cProc, "call", proc_call, -1);
    rb_define_method(rb_cProc, "[]", proc_call, -1);
    rb_define_method(rb_cProc, "===", proc_call, -1);
    rb_define_method(rb_cProc, "yield", proc_call, -1);
#endif
    rb_define_method(rb_cProc, "to_proc", proc_to_proc, 0);
    rb_define_method(rb_cProc, "arity", proc_arity, 0);
    rb_define_method(rb_cProc, "clone", proc_clone, 0);
    rb_define_method(rb_cProc, "dup", proc_dup, 0);
    rb_define_method(rb_cProc, "==", proc_eq, 1);
    rb_define_method(rb_cProc, "eql?", proc_eq, 1);
    rb_define_method(rb_cProc, "hash", proc_hash, 0);
    rb_define_method(rb_cProc, "to_s", proc_to_s, 0);
    rb_define_alias(rb_cProc, "inspect", "to_s");
    rb_define_method(rb_cProc, "lambda?", rb_proc_lambda_p, 0);
    rb_define_method(rb_cProc, "binding", proc_binding, 0);
    rb_define_method(rb_cProc, "curry", proc_curry, -1);
    rb_define_method(rb_cProc, "source_location", rb_proc_location, 0);
    rb_define_method(rb_cProc, "parameters", rb_proc_parameters, 0);

    /* Exceptions */
    rb_eLocalJumpError = rb_define_class("LocalJumpError", rb_eStandardError);
    rb_define_method(rb_eLocalJumpError, "exit_value", localjump_xvalue, 0);
    rb_define_method(rb_eLocalJumpError, "reason", localjump_reason, 0);

    rb_eSysStackError = rb_define_class("SystemStackError", rb_eException);
    sysstack_error = rb_exc_new3(rb_eSysStackError,
rb_obj_freeze(rb_str_new2("stack level too deep")));
    OBJ_TAINT(sysstack_error);

    /* utility functions */
    rb_define_global_function("proc", rb_block_proc, 0);
    rb_define_global_function("lambda", proc_lambda, 0);

    /* Method */
    rb_cMethod = rb_define_class("Method", rb_cObject);
    rb_undef_alloc_func(rb_cMethod);
    rb_undef_method(CLASS_OF(rb_cMethod), "new");
    rb_define_method(rb_cMethod, "==", method_eq, 1);
    rb_define_method(rb_cMethod, "eql?", method_eq, 1);
    rb_define_method(rb_cMethod, "hash", method_hash, 0);
    rb_define_method(rb_cMethod, "clone", method_clone, 0);
    rb_define_method(rb_cMethod, "call", rb_method_call, -1);
    rb_define_method(rb_cMethod, "[]", rb_method_call, -1);
    rb_define_method(rb_cMethod, "arity", method_arity_m, 0);
    rb_define_method(rb_cMethod, "inspect", method_inspect, 0);
    rb_define_method(rb_cMethod, "to_s", method_inspect, 0);
    rb_define_method(rb_cMethod, "to_proc", method_proc, 0);
    rb_define_method(rb_cMethod, "receiver", method_receiver, 0);
    rb_define_method(rb_cMethod, "name", method_name, 0);
    rb_define_method(rb_cMethod, "owner", method_owner, 0);
    rb_define_method(rb_cMethod, "unbind", method_unbind, 0);
    rb_define_method(rb_cMethod, "source_location", rb_method_location, 0);
    rb_define_method(rb_cMethod, "parameters", rb_method_parameters, 0);
    rb_define_method(rb_mKernel, "method", rb_obj_method, 1);
    rb_define_method(rb_mKernel, "public_method", rb_obj_public_method, 1);

    /* UnboundMethod */
    rb_cUnboundMethod = rb_define_class("UnboundMethod", rb_cObject);
    rb_undef_alloc_func(rb_cUnboundMethod);
    rb_undef_method(CLASS_OF(rb_cUnboundMethod), "new");
    rb_define_method(rb_cUnboundMethod, "==", method_eq, 1);
    rb_define_method(rb_cUnboundMethod, "eql?", method_eq, 1);
    rb_define_method(rb_cUnboundMethod, "hash", method_hash, 0);
    rb_define_method(rb_cUnboundMethod, "clone", method_clone, 0);
    rb_define_method(rb_cUnboundMethod, "arity", method_arity_m, 0);
    rb_define_method(rb_cUnboundMethod, "inspect", method_inspect, 0);
    rb_define_method(rb_cUnboundMethod, "to_s", method_inspect, 0);
    rb_define_method(rb_cUnboundMethod, "name", method_name, 0);
    rb_define_method(rb_cUnboundMethod, "owner", method_owner, 0);
    rb_define_method(rb_cUnboundMethod, "bind", umethod_bind, 1);
    rb_define_method(rb_cUnboundMethod, "source_location", rb_method_location, 0);
    rb_define_method(rb_cUnboundMethod, "parameters", rb_method_parameters, 0);

    /* Module#*_method */
    rb_define_method(rb_cModule, "instance_method", rb_mod_instance_method, 1);
    rb_define_method(rb_cModule, "public_instance_method", rb_mod_public_instance_method, 1);
    rb_define_private_method(rb_cModule, "define_method", rb_mod_define_method, -1);

    /* Kernel */
    rb_define_method(rb_mKernel, "define_singleton_method", rb_obj_define_method, -1);
}

/*
* Objects of class <code>Binding</code> encapsulate the execution
* context at some particular place in the code and retain this context
* for future use. The variables, methods, value of <code>self</code>,
* and possibly an iterator block that can be accessed in this context
* are all retained. Binding objects can be created using
* <code>Kernel#binding</code>, and are made available to the callback
* of <code>Kernel#set_trace_func</code>.
*
* These binding objects can be passed as the second argument of the
* <code>Kernel#eval</code> method, establishing an environment for the
* evaluation.
*
* class Demo
* def initialize(n)
* @secret = n
* end
* def get_binding
* return binding()
* end
* end
*
* k1 = Demo.new(99)
* b1 = k1.get_binding
* k2 = Demo.new(-3)
* b2 = k2.get_binding
*
* eval("@secret", b1) #=> 99
* eval("@secret", b2) #=> -3
* eval("@secret") #=> nil
*
* Binding objects have no class-specific methods.
*
*/

void
Init_Binding(void)
{
    rb_cBinding = rb_define_class("Binding", rb_cObject);
    rb_undef_alloc_func(rb_cBinding);
    rb_undef_method(CLASS_OF(rb_cBinding), "new");
    rb_define_method(rb_cBinding, "clone", binding_clone, 0);
    rb_define_method(rb_cBinding, "dup", binding_dup, 0);
    rb_define_method(rb_cBinding, "eval", bind_eval, -1);
    rb_define_global_function("binding", rb_f_binding, 0);
    attached = rb_intern("__attached__");
}

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