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* nqasm: Rename arglist non-terminals to a_*Bobby Bingham2017-01-151-39/+46
| | | | | This will allow differentiation between pcoff (a single argument) and a_pcoff (an argument list consisting of only a pcoff argument).
* nqasm: Handle immediate argumentsBobby Bingham2017-01-152-6/+41
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* nqasm: Handle register and register indirect argumentsBobby Bingham2017-01-155-53/+76
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* nqasm: Improve parsing at end of fileBobby Bingham2017-01-152-4/+6
| | | | | | | | | Bison's implicit $accept rule ends with the END token. The fact that input could also end with END (via the line non-terminal) resulted in a shift reduce conflict. We resolve the conflict by modifying the lexer so that if it encounters end of file partway through a line, it produces a final EOL token before EOF.
* Add gitignoreBobby Bingham2017-01-151-0/+7
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* nqasm: Initial stab at a lexer and parserBobby Bingham2017-01-155-0/+278
| | | | | So far, this only understands instructions, but no operands or labels. It doesn't handle bad input gracefully. It's just enough to test the basics.
* Add table of instructions and their encodingsBobby Bingham2017-01-152-0/+104