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"""Bytecode manipulation for coverage.py"""
import opcode, types
from coverage.backward import byte_to_int
class ByteCode(object):
"""A single bytecode."""
def __init__(self):
# The offset of this bytecode in the code object.
self.offset = -1
# The opcode, defined in the `opcode` module.
self.op = -1
# The argument, a small integer, whose meaning depends on the opcode.
self.arg = -1
# The offset in the code object of the next bytecode.
self.next_offset = -1
# The offset to jump to.
self.jump_to = -1
class ByteCodes(object):
"""Iterator over byte codes in `code`.
Returns `ByteCode` objects.
"""
# pylint: disable=R0924
def __init__(self, code):
self.code = code
def __getitem__(self, i):
return byte_to_int(self.code[i])
def __iter__(self):
offset = 0
while offset < len(self.code):
bc = ByteCode()
bc.op = self[offset]
bc.offset = offset
next_offset = offset+1
if bc.op >= opcode.HAVE_ARGUMENT:
bc.arg = self[offset+1] + 256*self[offset+2]
next_offset += 2
label = -1
if bc.op in opcode.hasjrel:
label = next_offset + bc.arg
elif bc.op in opcode.hasjabs:
label = bc.arg
bc.jump_to = label
bc.next_offset = offset = next_offset
yield bc
class CodeObjects(object):
"""Iterate over all the code objects in `code`."""
def __init__(self, code):
self.stack = [code]
def __iter__(self):
while self.stack:
# We're going to return the code object on the stack, but first
# push its children for later returning.
code = self.stack.pop()
for c in code.co_consts:
if isinstance(c, types.CodeType):
self.stack.append(c)
yield code
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