* eval.c (rb_eval): copy on write for argument local variable

  assignment.

* eval.c (assign): ditto.

* eval.c (rb_call0): update ruby_frame->argv with the default
  value used for the optional arguments.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@6706 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 4 deletions

diff --git a/eval.c b/eval.c
index d62f0f55d0..049b32fdc5 100644
--- a/eval.c
+++ b/eval.c
@@ -1240,8 +1240,6 @@ ruby_init()
     Init_stack((void*)&state);
     Init_heap();
     PUSH_SCOPE();
-    ruby_scope->local_vars = 0;
-    ruby_scope->local_tbl  = 0;
     top_scope = ruby_scope;
     /* default visibility is private at toplevel */
     SCOPE_SET(SCOPE_PRIVATE);
@@ -3425,6 +3423,7 @@ rb_eval(self, n)
 	if (ruby_scope->local_vars == 0)
 	    rb_bug("unexpected local variable assignment");
 	result = rb_eval(self, node->nd_value);
+	if (node->nd_cnt < ruby_frame->argc + 2) scope_dup(ruby_scope);
 	ruby_scope->local_vars[node->nd_cnt] = result;
 	break;
 
@@ -4963,6 +4962,7 @@ assign(self, lhs, val, pcall)
       case NODE_LASGN:
 	if (ruby_scope->local_vars == 0)
 	    rb_bug("unexpected local variable assignment");
+	if (lhs->nd_cnt < ruby_frame->argc + 2) scope_dup(ruby_scope);
 	ruby_scope->local_vars[lhs->nd_cnt] = val;
 	break;
 
@@ -5630,7 +5630,7 @@ rb_call0(klass, recv, id, oid, argc, argv, body, nosuper)
 		    if (local_vars) {
 			if (i > 0) {
 			    /* +2 for $_ and $~ */
-			    MEMCPY(local_vars+2, argv, VALUE, i);
+			    MEMCPY(local_vars+2, argv, VALUE, ruby_frame->argc);
 			}
 			argv += i; argc -= i;
 			if (node->nd_opt) {
@@ -5645,7 +5645,6 @@ rb_call0(klass, recv, id, oid, argc, argv, body, nosuper)
 				rb_eval(recv, opt);
 			    }
 			}
-			local_vars = ruby_scope->local_vars;
 			if ((int)node->nd_rest >= 0) {
 			    VALUE v;
 
@@ -5655,6 +5654,7 @@ rb_call0(klass, recv, id, oid, argc, argv, body, nosuper)
 				v = rb_ary_new2(0);
 			    ruby_scope->local_vars[node->nd_rest] = v;
 			}
+			ruby_frame->argv = ruby_scope->local_vars + 2;
 		    }
 		}