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30 lines
1.2 KiB
Python
30 lines
1.2 KiB
Python
"""Here we have "scanners" for the different Python versions.
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"scanner" is a compiler-centric term, but it is really a bit different from
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a traditional compiler scanner/lexer.
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Here we start out with text disasembly and change that to be more
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ameanable to parsing in which we look only at the opcode name, and not
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and instruction's operand.
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In some cases this is done by changing the opcode name. For example
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"LOAD_CONST" it customized based on the type of its operand into
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"LOAD_ASSERT", "LOAD_CODE", "LOAD_STR".
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instructions that take a variable number of arguments will have the argument count
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suffixed to the opcode name. "CALL", "MAKE_FUNCTION", "BUILD_TUPLE", "BUILD_LIST",
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work this way for example
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We also add pseudo instructions like "COME_FROM" which have an operand
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Instead of full grammars, we have full grammars for certain Python versions
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and the others indicate differences between a neighboring version.
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For example Python 2.6, 2.7, 3.2, and 3.7 are largely "base" versions
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which work off of scanner2.py, scanner3.py, and scanner37base.py.
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Some examples:
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Python 3.3 diffs off of 3.2; 3.1 and 3.0 diff off of 3.2; Python 1.0..Python 2.5 diff off of
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Python 2.6 and Python 3.8 diff off of 3.7
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"""
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