From 4b0a168d7b82d7b9e50f61fe8d7a336dc8d84316 Mon Sep 17 00:00:00 2001
From: nagachika <nagachika@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 21 Jan 2015 16:09:59 +0000
Subject: merge revision(s) r48744,r48752: [Backport #10579]

	* eval.c (rb_frame_last_func): return the most recent frame method
	  name.

	* thread.c (recursive_list_access): use the last method name,
	  instead of the current method name which can be unset in some
	  cases, not to use a symbol by the invalid ID.
	  [ruby-core:66742] [Bug #10579]

	* thread.c (exec_recursive): use the same last method name as
	  recursive_push in the error message when recursive_pop failed.
	  [ruby-core:66742] [Bug #10579]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@49369 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 thread.c | 30 ++++++++++++++++++------------
 1 file changed, 18 insertions(+), 12 deletions(-)

(limited to 'thread.c')

diff --git a/thread.c b/thread.c
index d9df90272e..b24d29e087 100644
--- a/thread.c
+++ b/thread.c
@@ -4763,6 +4763,8 @@ ident_hash_new(void)
     return hash;
 }
 
+ID rb_frame_last_func(void);
+
 /*
  * Returns the current "recursive list" used to detect recursion.
  * This list is a hash table, unique for the current thread and for
@@ -4770,10 +4772,9 @@ ident_hash_new(void)
  */
 
 static VALUE
-recursive_list_access(void)
+recursive_list_access(VALUE sym)
 {
     volatile VALUE hash = rb_thread_local_aref(rb_thread_current(), recursive_key);
-    VALUE sym = ID2SYM(rb_frame_this_func());
     VALUE list;
     if (NIL_P(hash) || !RB_TYPE_P(hash, T_HASH)) {
 	hash = ident_hash_new();
@@ -4875,25 +4876,23 @@ recursive_push(VALUE list, VALUE obj, VALUE paired_obj)
  * Assumes the recursion list is valid.
  */
 
-static void
+static int
 recursive_pop(VALUE list, VALUE obj, VALUE paired_obj)
 {
     if (paired_obj) {
 	VALUE pair_list = rb_hash_lookup2(list, obj, Qundef);
 	if (pair_list == Qundef) {
-	    VALUE symname = rb_inspect(ID2SYM(rb_frame_this_func()));
-	    VALUE thrname = rb_inspect(rb_thread_current());
-	    rb_raise(rb_eTypeError, "invalid inspect_tbl pair_list for %s in %s",
-		     StringValuePtr(symname), StringValuePtr(thrname));
+	    return 0;
 	}
 	if (RB_TYPE_P(pair_list, T_HASH)) {
 	    rb_hash_delete(pair_list, paired_obj);
 	    if (!RHASH_EMPTY_P(pair_list)) {
-		return; /* keep hash until is empty */
+		return 1; /* keep hash until is empty */
 	    }
 	}
     }
     rb_hash_delete(list, obj);
+    return 1;
 }
 
 struct exec_recursive_params {
@@ -4927,9 +4926,11 @@ static VALUE
 exec_recursive(VALUE (*func) (VALUE, VALUE, int), VALUE obj, VALUE pairid, VALUE arg, int outer)
 {
     VALUE result = Qundef;
+    const ID mid = rb_frame_last_func();
+    const VALUE sym = mid ? ID2SYM(mid) : ID2SYM(idNULL);
     struct exec_recursive_params p;
     int outermost;
-    p.list = recursive_list_access();
+    p.list = recursive_list_access(sym);
     p.objid = rb_obj_id(obj);
     p.obj = obj;
     p.pairid = pairid;
@@ -4951,8 +4952,8 @@ exec_recursive(VALUE (*func) (VALUE, VALUE, int), VALUE obj, VALUE pairid, VALUE
 	    recursive_push(p.list, ID2SYM(recursive_key), 0);
 	    recursive_push(p.list, p.objid, p.pairid);
 	    result = rb_catch_protect(p.list, exec_recursive_i, (VALUE)&p, &state);
-	    recursive_pop(p.list, p.objid, p.pairid);
-	    recursive_pop(p.list, ID2SYM(recursive_key), 0);
+	    if (!recursive_pop(p.list, p.objid, p.pairid)) goto invalid;
+	    if (!recursive_pop(p.list, ID2SYM(recursive_key), 0)) goto invalid;
 	    if (state) JUMP_TAG(state);
 	    if (result == p.list) {
 		result = (*func)(obj, arg, TRUE);
@@ -4965,7 +4966,12 @@ exec_recursive(VALUE (*func) (VALUE, VALUE, int), VALUE obj, VALUE pairid, VALUE
 		result = (*func)(obj, arg, FALSE);
 	    }
 	    POP_TAG();
-	    recursive_pop(p.list, p.objid, p.pairid);
+	    if (!recursive_pop(p.list, p.objid, p.pairid)) {
+	      invalid:
+		rb_raise(rb_eTypeError, "invalid inspect_tbl pair_list "
+			 "for %+"PRIsVALUE" in %+"PRIsVALUE,
+			 sym, rb_thread_current());
+	    }
 	    if (state) JUMP_TAG(state);
 	}
     }
-- 
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