[EXPERIMENTAL]

* iseq.c: add following two methods.
* ISeq#line_trace_all returns all line traces (line numbers)
* ISeq#line_trace_specify(pos, set) set `pos'th line event to
  specified_line event (if set is true).
  These features are introduced for debuggers (mainly to make
  breakpoint).
* iseq.h: add decl. of C APIs.
* test/ruby/test_iseq.rb: add tests.
* vm_trace.c: add `specified_line' event.
* include/ruby/ruby.h: ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38076 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_iseq.rb

@@ -25,4 +25,28 @@ class TestISeq < Test::Unit::TestCase
   ensure
     Encoding.default_internal = enc
   end
+
+  def test_line_trace
+    iseq = ISeq.compile \
+  %q{ a = 1
+      b = 2
+      c = 3
+      # d = 4
+      e = 5
+      # f = 6
+      g = 7
+
+    }
+    assert_equal([1, 2, 3, 5, 7], iseq.line_trace_all)
+    iseq.line_trace_specify(1, true) # line 2
+    iseq.line_trace_specify(3, true) # line 5
+
+    result = []
+    TracePoint.new(:specified_line){|tp|
+      result << tp.lineno
+    }.enable{
+      iseq.eval
+    }
+    assert_equal([2, 5], result)
+  end
 end