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88 lines
3.0 KiB
Python
88 lines
3.0 KiB
Python
"""
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Programming Language for 6502/6510 microprocessors, codename 'Sick'
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Shared logic for the code generators.
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Written by Irmen de Jong (irmen@razorvine.net) - license: GNU GPL 3.0
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"""
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import math
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from ..datatypes import FLOAT_MAX_POSITIVE, FLOAT_MAX_NEGATIVE
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from ..plyparse import Module, Label, Block, Directive, VarDef
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from ..plylex import print_bold
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class CodeGenerationError(Exception):
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pass
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def sanitycheck(module: Module) -> None:
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for label in module.all_nodes(Label):
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if label.name == "start" and label.my_scope().name == "main": # type: ignore
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break
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else:
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print_bold("ERROR: program entry point is missing ('start' label in 'main' block)\n")
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raise SystemExit(1)
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all_blocknames = [b.name for b in module.all_nodes(Block)] # type: ignore
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unique_blocknames = set(all_blocknames)
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if len(all_blocknames) != len(unique_blocknames):
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for name in unique_blocknames:
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all_blocknames.remove(name)
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raise CodeGenerationError("there are duplicate block names", all_blocknames)
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zpblock = module.zeropage()
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if zpblock:
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# ZP block contains no code?
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for stmt in zpblock.scope.nodes:
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if not isinstance(stmt, (Directive, VarDef)):
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raise CodeGenerationError("ZP block can only contain directive and var")
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def to_hex(number: int) -> str:
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# 0..15 -> "0".."15"
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# 16..255 -> "$10".."$ff"
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# 256..65536 -> "$0100".."$ffff"
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assert type(number) is int
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if number is None:
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raise ValueError("number")
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if 0 <= number < 16:
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return str(number)
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if 0 <= number < 0x100:
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return "${:02x}".format(number)
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if 0 <= number < 0x10000:
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return "${:04x}".format(number)
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raise OverflowError(number)
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def to_mflpt5(number: float) -> bytearray:
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# algorithm here https://sourceforge.net/p/acme-crossass/code-0/62/tree/trunk/ACME_Lib/cbm/mflpt.a
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number = float(number)
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if number < FLOAT_MAX_NEGATIVE or number > FLOAT_MAX_POSITIVE:
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raise OverflowError("floating point number out of 5-byte mflpt range", number)
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if number == 0.0:
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return bytearray([0, 0, 0, 0, 0])
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if number < 0.0:
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sign = 0x80000000
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number = -number
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else:
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sign = 0x00000000
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mant, exp = math.frexp(number)
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exp += 128
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if exp < 1:
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# underflow, use zero instead
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return bytearray([0, 0, 0, 0, 0])
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if exp > 255:
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raise OverflowError("floating point number out of 5-byte mflpt range", number)
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mant = sign | int(mant * 0x100000000) & 0x7fffffff
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return bytearray([exp]) + int.to_bytes(mant, 4, "big")
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def mflpt5_to_float(mflpt: bytearray) -> float:
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# algorithm here https://sourceforge.net/p/acme-crossass/code-0/62/tree/trunk/ACME_Lib/cbm/mflpt.a
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if mflpt == bytearray([0, 0, 0, 0, 0]):
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return 0.0
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exp = mflpt[0] - 128
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sign = mflpt[1] & 0x80
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number = 0x80000000 | int.from_bytes(mflpt[1:], "big")
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number = float(number) * 2**exp / 0x100000000
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return -number if sign else number
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