vm_method.c: add new ruby::method-cache-clear dtrace probe

* vm_method.c (rb_clear_method_cache_by_class): fire
  ruby::method-cache-clear probe on global or klass-level method cache
  clear [Bug #9190]
* probes.d (provider ruby): new dtrace probe
* doc/dtrace_probes.rdoc: docs for new probe
* test/dtrace/test_method_cache.rb: test for new probe

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44103 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 28 insertions, 0 deletions

diff --git a/test/dtrace/test_method_cache.rb b/test/dtrace/test_method_cache.rb
new file mode 100644
index 0000000000..d8ddf454f4
--- /dev/null
+++ b/test/dtrace/test_method_cache.rb
@@ -0,0 +1,28 @@
+require_relative 'helper'
+
+module DTrace
+  class TestMethodCacheClear < TestCase
+    def test_method_cache_clear
+      trap_probe(probe, <<-code) do |_,rbfile,lines|
+        class String; end
+        class String; def abc() end end
+        class Object; def abc() end end
+      code
+        assert_not_includes lines, "String #{rbfile} 1\n"
+        assert_includes     lines, "String #{rbfile} 2\n"
+        assert_includes     lines, "global #{rbfile} 3\n"
+      end
+    end
+
+    private
+    def probe
+      <<-eoprobe
+ruby$target:::method-cache-clear
+/arg1/
+{
+  printf("%s %s %d\\n", copyinstr(arg0), copyinstr(arg1), arg2);
+}
+      eoprobe
+    end
+  end
+end if defined?(DTrace::TestCase)