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