method

binding

v2_2_9 - Show latest stable - 0 notes - Class: Proc

binding() public

Returns the binding associated with prc. Note that Kernel#eval accepts either a Proc or a Binding object as its second parameter.

def fred(param)
  proc {}
end

b = fred(99)
eval("param", b.binding)   #=> 99

Show source

static VALUE
proc_binding(VALUE self)
{
    rb_proc_t *proc;
    VALUE bindval, envval;
    rb_binding_t *bind;
    rb_iseq_t *iseq;

    GetProcPtr(self, proc);
    envval = proc->envval;
    iseq = proc->block.iseq;
    if (RUBY_VM_IFUNC_P(iseq)) {
        rb_env_t *env;
        if (!IS_METHOD_PROC_NODE((NODE *)iseq)) {
            rb_raise(rb_eArgError, "Can't create Binding from C level Proc");
        }
        iseq = rb_method_get_iseq(RNODE(iseq)->u2.value);
        GetEnvPtr(envval, env);
        if (iseq && env->local_size < iseq->local_size) {
            int prev_local_size = env->local_size;
            int local_size = iseq->local_size;
            VALUE newenvval = TypedData_Wrap_Struct(RBASIC_CLASS(envval), RTYPEDDATA_TYPE(envval), 0);
            rb_env_t *newenv = xmalloc(sizeof(rb_env_t) + ((local_size + 1) * sizeof(VALUE)));
            RTYPEDDATA_DATA(newenvval) = newenv;
            newenv->env_size = local_size + 2;
            newenv->local_size = local_size;
            newenv->prev_envval = env->prev_envval;
            newenv->block = env->block;
            MEMCPY(newenv->env, env->env, VALUE, prev_local_size + 1);
            rb_mem_clear(newenv->env + prev_local_size + 1, local_size - prev_local_size);
            newenv->env[local_size + 1] = newenvval;
            envval = newenvval;
        }
    }

    bindval = rb_binding_alloc(rb_cBinding);
    GetBindingPtr(bindval, bind);
    bind->env = envval;
    bind->blockprocval = proc->blockprocval;
    if (RUBY_VM_NORMAL_ISEQ_P(iseq)) {
        bind->path = iseq->location.path;
        bind->first_lineno = FIX2INT(rb_iseq_first_lineno(iseq->self));
    }
    else {
        bind->path = Qnil;
        bind->first_lineno = 0;
    }
    return bindval;
}

binding

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