merges r21651 from trunk into ruby_1_9_1.

* eval.c, vm_eval.c (rb_f_local_variables): move definition from eval.c
  to vm_eval.c because vm_collect_local_variables_in_heap() should
  be static function.
* vm.c (vm_collect_local_variables_in_heap): make it static.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@21846 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 58 insertions, 0 deletions

diff --git a/vm_eval.c b/vm_eval.c
index 851eaaf9ff..b0a9b29aee 100644
--- a/vm_eval.c
+++ b/vm_eval.c
@@ -19,6 +19,7 @@ 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_exec(rb_thread_t *th);
 static void vm_set_eval_stack(rb_thread_t * th, VALUE iseqval, const NODE *cref);
+static int vm_collect_local_variables_in_heap(rb_thread_t *th, VALUE *dfp, VALUE ary);
 
 static inline VALUE
 vm_call0(rb_thread_t * th, VALUE klass, VALUE recv, VALUE id, ID oid,
@@ -1321,10 +1322,67 @@ rb_make_backtrace(void)
     return vm_backtrace(GET_THREAD(), -1);
 }
 
+/*
+ *  call-seq:
+ *     local_variables    => array
+ *
+ *  Returns the names of the current local variables.
+ *
+ *     fred = 1
+ *     for i in 1..10
+ *        # ...
+ *     end
+ *     local_variables   #=> ["fred", "i"]
+ */
+
+static VALUE
+rb_f_local_variables(void)
+{
+    VALUE ary = rb_ary_new();
+    rb_thread_t *th = GET_THREAD();
+    rb_control_frame_t *cfp =
+	vm_get_ruby_level_caller_cfp(th, RUBY_VM_PREVIOUS_CONTROL_FRAME(th->cfp));
+    int i;
+
+    while (cfp) {
+	if (cfp->iseq) {
+	    for (i = 0; i < cfp->iseq->local_table_size; i++) {
+		ID lid = cfp->iseq->local_table[i];
+		if (lid) {
+		    const char *vname = rb_id2name(lid);
+		    /* should skip temporary variable */
+		    if (vname) {
+			rb_ary_push(ary, ID2SYM(lid));
+		    }
+		}
+	    }
+	}
+	if (cfp->lfp != cfp->dfp) {
+	    /* block */
+	    VALUE *dfp = GC_GUARDED_PTR_REF(cfp->dfp[0]);
+
+	    if (vm_collect_local_variables_in_heap(th, dfp, ary)) {
+		break;
+	    }
+	    else {
+		while (cfp->dfp != dfp) {
+		    cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
+		}
+	    }
+	}
+	else {
+	    break;
+	}
+    }
+    return ary;
+}
+
 void
 Init_vm_eval(void)
 {
     rb_define_global_function("eval", rb_f_eval, -1);
+    rb_define_global_function("local_variables", rb_f_local_variables, 0);
+
     rb_define_global_function("catch", rb_f_catch, -1);
     rb_define_global_function("throw", rb_f_throw, -1);