Add coverage

tools/telemetry/third_party/coverage/coverage/bytecode.py

Index: tools/telemetry/third_party/coverage/coverage/bytecode.py
diff --git a/third_party/pycoverage/coverage/bytecode.py b/tools/telemetry/third_party/coverage/coverage/bytecode.py
similarity index 77%
copy from third_party/pycoverage/coverage/bytecode.py
copy to tools/telemetry/third_party/coverage/coverage/bytecode.py
index 85360638528e6bece33b1f5a1e4dd08e5c2ac3d0..82929cef8a7b980a6d33512d83e67392fddac087 100644
--- a/third_party/pycoverage/coverage/bytecode.py
+++ b/tools/telemetry/third_party/coverage/coverage/bytecode.py
@@ -1,9 +1,14 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://bitbucket.org/ned/coveragepy/src/default/NOTICE.txt
+
 """Bytecode manipulation for coverage.py"""
 
-import opcode, types
+import opcode
+import types
 
 from coverage.backward import byte_to_int
 
+
 class ByteCode(object):
     """A single bytecode."""
     def __init__(self):
@@ -26,10 +31,12 @@ class ByteCode(object):
 class ByteCodes(object):
     """Iterator over byte codes in `code`.
 
+    This handles the logic of EXTENDED_ARG byte codes internally.  Those byte
+    codes are not returned by this iterator.
+
     Returns `ByteCode` objects.
 
     """
-    # pylint: disable=R0924
     def __init__(self, code):
         self.code = code
 
@@ -38,6 +45,7 @@ class ByteCodes(object):
 
     def __iter__(self):
         offset = 0
+        ext_arg = 0
         while offset < len(self.code):
             bc = ByteCode()
             bc.op = self[offset]
@@ -45,7 +53,7 @@ class ByteCodes(object):
 
             next_offset = offset+1
             if bc.op >= opcode.HAVE_ARGUMENT:
-                bc.arg = self[offset+1] + 256*self[offset+2]
+                bc.arg = ext_arg + self[offset+1] + 256*self[offset+2]
                 next_offset += 2
 
                 label = -1
@@ -56,7 +64,11 @@ class ByteCodes(object):
                 bc.jump_to = label
 
             bc.next_offset = offset = next_offset
-            yield bc
+            if bc.op == opcode.EXTENDED_ARG:
+                ext_arg = bc.arg * 256*256
+            else:
+                ext_arg = 0
+                yield bc
 
 
 class CodeObjects(object):