* error.c: add Exception#backtrace_locations.

  Now, there are no setter and independent from Exception#backtrace.
  [Feature #8960]
* eval.c (setup_exception): set backtrace locations for `bt_location'
  special attribute.
* vm_backtrace.c (rb_backtrace_to_location_ary): added.
* internal.h: ditto.
* test/ruby/test_backtrace.rb: add a test for
  Exception#backtrace_locations.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44170 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 25 insertions, 0 deletions

diff --git a/error.c b/error.c
index ac7b632751..b9d8d52809 100644
--- a/error.c
+++ b/error.c
@@ -736,6 +736,30 @@ exc_backtrace(VALUE exc)
     return obj;
 }
 
+/*
+ *  call-seq:
+ *     exception.backtrace_locations    -> array
+ *
+ *  Returns any backtrace associated with the exception. This method is
+ *  similar to Exception#backtrace, but the backtrace is an array of
+ *   Thread::Backtrace::Location.
+ *
+ *  Now, this method is not affected by Exception#set_backtrace().
+ */
+static VALUE
+exc_backtrace_locations(VALUE exc)
+{
+    ID bt_locations;
+    VALUE obj;
+
+    CONST_ID(bt_locations, "bt_locations");
+    obj = rb_attr_get(exc, bt_locations);
+    if (!NIL_P(obj)) {
+	obj = rb_backtrace_to_location_ary(obj);
+    }
+    return obj;
+}
+
 VALUE
 rb_check_backtrace(VALUE bt)
 {
@@ -1749,6 +1773,7 @@ Init_Exception(void)
     rb_define_method(rb_eException, "message", exc_message, 0);
     rb_define_method(rb_eException, "inspect", exc_inspect, 0);
     rb_define_method(rb_eException, "backtrace", exc_backtrace, 0);
+    rb_define_method(rb_eException, "backtrace_locations", exc_backtrace_locations, 0);
     rb_define_method(rb_eException, "set_backtrace", exc_set_backtrace, 1);
     rb_define_method(rb_eException, "cause", exc_cause, 0);