diff options
Diffstat (limited to 'coverage/parser.py')
| -rw-r--r-- | coverage/parser.py | 15 |
1 files changed, 6 insertions, 9 deletions
diff --git a/coverage/parser.py b/coverage/parser.py index 44455054..bb6b6082 100644 --- a/coverage/parser.py +++ b/coverage/parser.py @@ -381,27 +381,25 @@ class ByteParser(object): """Map byte offsets to line numbers in `code`. Uses co_lnotab described in Python/compile.c to map byte offsets to - line numbers. Returns a list: [(b0, l0), (b1, l1), ...] + line numbers. Produces a sequence: (b0, l0), (b1, l1), ... """ # Adapted from dis.py in the standard library. byte_increments = self._lnotab_increments(self.code.co_lnotab[0::2]) line_increments = self._lnotab_increments(self.code.co_lnotab[1::2]) - bytes_lines = [] last_line_num = None line_num = self.code.co_firstlineno byte_num = 0 for byte_incr, line_incr in zip(byte_increments, line_increments): if byte_incr: if line_num != last_line_num: - bytes_lines.append((byte_num, line_num)) + yield (byte_num, line_num) last_line_num = line_num byte_num += byte_incr line_num += line_incr if line_num != last_line_num: - bytes_lines.append((byte_num, line_num)) - return bytes_lines + yield (byte_num, line_num) def _find_statements(self): """Find the statements in `self.code`. @@ -426,7 +424,6 @@ class ByteParser(object): Returns a list of `Chunk` objects. """ - # The list of chunks so far, and the one we're working on. chunks = [] chunk = None @@ -634,11 +631,11 @@ class ByteParser(object): class Chunk(object): - """A sequence of bytecodes with a single entrance. + """A sequence of byte codes with a single entrance. To analyze byte code, we have to divide it into chunks, sequences of byte - codes such that each basic block has only one entrance, the first - instruction in the block. + codes such that each chunk has only one entrance, the first instruction in + the block. This is almost the CS concept of `basic block`_, except that we're willing to have many exits from a chunk, and "basic block" is a more cumbersome |