* vm.c (frame_info_to_str): add `break'.

* vm.c (backtrace_object): remove lev and n parameter.
  backtrace_object always returns all of backtrace information.
* vm.c (rb_backtrace_to_str_ary): fix to use backtrace_object().
  This change improve performance of caller(lev, n).
* benchmark/bm_vm3_backtrace.rb: added to check above improvement.
  FYI: measurement on my laptop, 1.9.3p229 needs 5.125 sec,
  and current trunk only needs 0.299sec.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35800 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 22 insertions, 0 deletions

diff --git a/benchmark/bm_vm3_backtrace.rb b/benchmark/bm_vm3_backtrace.rb
new file mode 100644
index 0000000000..0fbf73e1ca
--- /dev/null
+++ b/benchmark/bm_vm3_backtrace.rb
@@ -0,0 +1,22 @@
+# get last backtrace
+
+begin
+  caller(0, 0)
+rescue ArgumentError
+  alias caller_orig caller
+  def caller lev, n
+    caller_orig(lev)[0..n]
+  end
+end
+
+def rec n
+  if n < 0
+    100_000.times{
+      caller(0, 1)
+    }
+  else
+    rec(n-1)
+  end
+end
+
+rec 50