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639 lines
25 KiB
Python
639 lines
25 KiB
Python
"""
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Intermediate Language for 6502/6510 microprocessors
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Here are the symbol (name) operations such as lookups, datatype definitions.
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Written by Irmen de Jong (irmen@razorvine.net)
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License: GNU GPL 3.0, see LICENSE
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"""
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import inspect
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import math
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import enum
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import builtins
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from functools import total_ordering
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from typing import Optional, Set, Union, Tuple, Dict, Iterable, Sequence, Any, List
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PrimitiveType = Union[int, float, str]
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REGISTER_SYMBOLS = {"A", "X", "Y", "AX", "AY", "XY", "SC"}
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REGISTER_SYMBOLS_RETURNVALUES = REGISTER_SYMBOLS | {"SZ"}
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REGISTER_BYTES = {"A", "X", "Y", "SC"}
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REGISTER_WORDS = {"AX", "AY", "XY"}
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# 5-byte cbm MFLPT format limitations:
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FLOAT_MAX_POSITIVE = 1.7014118345e+38
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FLOAT_MAX_NEGATIVE = -1.7014118345e+38
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RESERVED_NAMES = {'true', 'false', 'var', 'memory', 'const', 'asm'}
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RESERVED_NAMES |= REGISTER_SYMBOLS
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MATH_SYMBOLS = {name for name in dir(math) if name[0].islower()}
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BUILTIN_SYMBOLS = {name for name in dir(builtins) if name[0].islower()}
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@total_ordering
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class DataType(enum.Enum):
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"""The possible data types of values"""
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BYTE = 1
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WORD = 2
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FLOAT = 3
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BYTEARRAY = 4
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WORDARRAY = 5
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MATRIX = 6
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STRING = 7
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STRING_P = 8
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STRING_S = 9
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STRING_PS = 10
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def assignable_from_value(self, value: PrimitiveType) -> bool:
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if isinstance(value, (int, float)):
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if self == DataType.BYTE:
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return 0 <= value < 0x100
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if self == DataType.WORD:
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return 0 <= value < 0x10000
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if self == DataType.FLOAT:
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return type(value) in (float, int)
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return False
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def __lt__(self, other):
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if self.__class__ == other.__class__:
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return self.value < other.value
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return NotImplemented
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STRING_DATATYPES = {DataType.STRING, DataType.STRING_P, DataType.STRING_S, DataType.STRING_PS}
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class SymbolError(Exception):
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pass
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_identifier_seq_nr = 0
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class SourceRef:
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__slots__ = ("file", "line", "column")
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def __init__(self, file: str, line: int, column: int=0) -> None:
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self.file = file
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self.line = line
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self.column = column
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def __str__(self) -> str:
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if self.column:
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return "{:s}:{:d}:{:d}".format(self.file, self.line, self.column)
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if self.line:
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return "{:s}:{:d}".format(self.file, self.line)
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return self.file
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def copy(self) -> 'SourceRef':
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return SourceRef(self.file, self.line, self.column)
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class SymbolDefinition:
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def __init__(self, blockname: str, name: str, sourceref: SourceRef, allocate: bool) -> None:
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self.blockname = blockname
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self.name = name
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self.sourceref = sourceref
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self.allocate = allocate # set to false if the variable is memory mapped (or a constant) instead of allocated
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global _identifier_seq_nr
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self.seq_nr = _identifier_seq_nr
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_identifier_seq_nr += 1
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def __lt__(self, other: 'SymbolDefinition') -> bool:
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if not isinstance(other, SymbolDefinition):
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return NotImplemented
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return (self.blockname, self.name, self.seq_nr) < (other.blockname, other.name, self.seq_nr)
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def __str__(self):
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return "<{:s} {:s}.{:s}>".format(self.__class__.__name__, self.blockname, self.name)
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class LabelDef(SymbolDefinition):
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pass
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class VariableDef(SymbolDefinition):
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# if address is None, it's a dynamically allocated variable.
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# if address is not None, it's a memory mapped variable (=memory address referenced by a name).
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def __init__(self, blockname: str, name: str, sourceref: SourceRef,
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datatype: DataType, allocate: bool, *,
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value: PrimitiveType, length: int, address: Optional[int]=None,
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register: str=None, matrixsize: Tuple[int, int]=None) -> None:
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super().__init__(blockname, name, sourceref, allocate)
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self.type = datatype
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self.address = address
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self.length = length
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self.value = value
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self.register = register
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self.matrixsize = matrixsize
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@property
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def is_memmap(self):
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return self.address is not None
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def __repr__(self):
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return "<Variable {:s}.{:s}, {:s}, addr {:s}, len {:s}, value {:s}>"\
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.format(self.blockname, self.name, self.type, str(self.address), str(self.length), str(self.value))
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def __lt__(self, other: 'SymbolDefinition') -> bool:
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if not isinstance(other, VariableDef):
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return NotImplemented
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v1 = (self.blockname, self.name or "", self.address or 0, self.seq_nr)
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v2 = (other.blockname, other.name or "", other.address or 0, self.seq_nr)
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return v1 < v2
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class ConstantDef(SymbolDefinition):
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def __init__(self, blockname: str, name: str, sourceref: SourceRef, datatype: DataType, *,
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value: PrimitiveType, length: int) -> None:
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super().__init__(blockname, name, sourceref, False)
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self.type = datatype
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self.length = length
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self.value = value
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def __repr__(self):
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return "<Constant {:s}.{:s}, {:s}, len {:s}, value {:s}>"\
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.format(self.blockname, self.name, self.type, str(self.length), str(self.value))
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def __lt__(self, other: 'SymbolDefinition') -> bool:
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if not isinstance(other, ConstantDef):
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return NotImplemented
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v1 = (str(self.value) or "", self.blockname, self.name or "", self.seq_nr)
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v2 = (str(other.value) or "", other.blockname, other.name or "", self.seq_nr)
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return v1 < v2
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class SubroutineDef(SymbolDefinition):
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def __init__(self, blockname: str, name: str, sourceref: SourceRef,
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parameters: Sequence[Tuple[str, str]], returnvalues: Set[str], address: Optional[int]=None) -> None:
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super().__init__(blockname, name, sourceref, False)
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self.address = address
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self.parameters = parameters
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self.input_registers = set() # type: Set[str]
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self.return_registers = set() # type: Set[str]
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self.clobbered_registers = set() # type: Set[str]
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for _, param in parameters:
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if param in REGISTER_BYTES:
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self.input_registers.add(param)
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elif param in REGISTER_WORDS:
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self.input_registers.add(param[0])
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self.input_registers.add(param[1])
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else:
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raise SymbolError("invalid parameter spec: " + param)
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for register in returnvalues:
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if register in REGISTER_SYMBOLS_RETURNVALUES:
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self.return_registers.add(register)
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elif register[-1] == "?":
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for r in register[:-1]:
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if r not in REGISTER_SYMBOLS_RETURNVALUES:
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raise SymbolError("invalid return value spec: " + r)
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self.clobbered_registers.add(r)
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else:
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raise SymbolError("invalid return value spec: " + register)
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class Zeropage:
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SCRATCH_B1 = 0x02
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SCRATCH_B2 = 0x03
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def __init__(self) -> None:
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self.unused_bytes = [] # type: List[int]
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self.unused_words = [] # type: List[int]
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def configure(self, clobber_zp: bool = False) -> None:
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if clobber_zp:
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self.unused_bytes = list(range(0x04, 0x80))
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self.unused_words = list(range(0x80, 0x100, 2))
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else:
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# these are valid for the C-64:
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# ($02 and $03 are reserved as scratch addresses for various routines)
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self.unused_bytes = [0x06, 0x0a, 0x2a, 0x52, 0x93] # 5 zp variables (8 bits each)
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self.unused_words = [0x04, 0xf7, 0xf9, 0xfb, 0xfd] # 5 zp variables (16 bits each)
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assert self.SCRATCH_B1 not in self.unused_bytes and self.SCRATCH_B1 not in self.unused_words
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assert self.SCRATCH_B2 not in self.unused_bytes and self.SCRATCH_B2 not in self.unused_words
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def get_unused_byte(self):
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return self.unused_bytes.pop()
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def get_unused_word(self):
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return self.unused_words.pop()
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@property
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def available_byte_vars(self) -> int:
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return len(self.unused_bytes)
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@property
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def available_word_vars(self) -> int:
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return len(self.unused_words)
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# the single, global Zeropage object
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zeropage = Zeropage()
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class SymbolTable:
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def __init__(self, name: str, parent: Optional['SymbolTable'], owning_block: Any) -> None:
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self.name = name
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self.symbols = {} # type: Dict[str, Union[SymbolDefinition, SymbolTable]]
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self.parent = parent
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self.owning_block = owning_block
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self.eval_dict = None
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def __iter__(self):
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yield from self.symbols.values()
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def __getitem__(self, symbolname: str) -> Union[SymbolDefinition, 'SymbolTable']:
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return self.symbols[symbolname]
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def __contains__(self, symbolname: str) -> bool:
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return symbolname in self.symbols
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def lookup(self, dottedname: str, include_builtin_names: bool=False) -> Tuple['SymbolTable', Union[SymbolDefinition, 'SymbolTable']]:
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nameparts = dottedname.split('.')
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if len(nameparts) == 1:
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try:
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return self, self.symbols[nameparts[0]]
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except LookupError:
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if include_builtin_names:
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if nameparts[0] in MATH_SYMBOLS:
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return self, getattr(math, nameparts[0])
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elif nameparts[0] in BUILTIN_SYMBOLS:
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return self, getattr(builtins, nameparts[0])
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raise SymbolError("undefined symbol '{:s}'".format(nameparts[0]))
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# start from toplevel namespace:
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scope = self
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while scope.parent:
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scope = scope.parent
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for namepart in nameparts[:-1]:
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try:
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scope = scope.symbols[namepart] # type: ignore
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assert scope.name == namepart
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except LookupError:
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raise SymbolError("undefined block '{:s}'".format(namepart))
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if isinstance(scope, SymbolTable):
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return scope.lookup(nameparts[-1])
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else:
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raise SymbolError("invalid block name '{:s}' in dotted name".format(namepart))
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def get_address(self, name: str) -> int:
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scope, symbol = self.lookup(name)
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if isinstance(symbol, ConstantDef):
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raise SymbolError("cannot take the address of a constant")
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if not symbol or not isinstance(symbol, VariableDef):
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raise SymbolError("no var or const defined by that name")
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if symbol.address is None:
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raise SymbolError("can only take address of memory mapped variables")
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return symbol.address
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def as_eval_dict(self) -> Dict[str, Any]:
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# return a dictionary suitable to be passed as locals or globals to eval()
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if self.eval_dict is None:
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d = Eval_symbol_dict(self)
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self.eval_dict = d # type: ignore
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return self.eval_dict
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def iter_variables(self) -> Iterable[VariableDef]:
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yield from sorted((v for v in self.symbols.values() if isinstance(v, VariableDef)))
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def iter_constants(self) -> Iterable[ConstantDef]:
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yield from sorted((v for v in self.symbols.values() if isinstance(v, ConstantDef)))
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def iter_subroutines(self) -> Iterable[SubroutineDef]:
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yield from sorted((v for v in self.symbols.values() if isinstance(v, SubroutineDef)))
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def iter_labels(self) -> Iterable[LabelDef]:
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yield from sorted((v for v in self.symbols.values() if isinstance(v, LabelDef)))
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def check_identifier_valid(self, name: str, sourceref: SourceRef) -> None:
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if not name.isidentifier():
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raise SymbolError("invalid identifier")
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identifier = self.symbols.get(name, None)
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if identifier:
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if isinstance(identifier, SymbolDefinition):
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raise SymbolError("identifier was already defined at " + str(identifier.sourceref))
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raise SymbolError("identifier already defined as " + str(type(identifier)))
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if name in MATH_SYMBOLS:
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print("warning: {}: identifier shadows a name from the math module".format(sourceref))
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elif name in BUILTIN_SYMBOLS:
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print("warning: {}: identifier shadows a builtin name".format(sourceref))
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def define_variable(self, name: str, sourceref: SourceRef, datatype: DataType, *,
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address: int=None, length: int=0, value: PrimitiveType=0,
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matrixsize: Tuple[int, int]=None, register: str=None) -> None:
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# this defines a new variable and also checks if the prefill value is allowed for the variable type.
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assert value is not None
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self.check_identifier_valid(name, sourceref)
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range_error = check_value_in_range(datatype, register, length, value)
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if range_error:
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raise ValueError(range_error)
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if type(value) in (int, float):
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_, value = coerce_value(sourceref, datatype, value) # type: ignore
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allocate = address is None
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if datatype == DataType.BYTE:
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if allocate and self.name == "ZP":
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try:
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address = zeropage.get_unused_byte()
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except LookupError:
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raise SymbolError("too many global 8-bit variables in ZP")
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self.symbols[name] = VariableDef(self.name, name, sourceref, DataType.BYTE, allocate,
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value=value, length=1, address=address)
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elif datatype == DataType.WORD:
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if allocate and self.name == "ZP":
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try:
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address = zeropage.get_unused_word()
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except LookupError:
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raise SymbolError("too many global 16-bit variables in ZP")
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self.symbols[name] = VariableDef(self.name, name, sourceref, DataType.WORD, allocate,
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value=value, length=1, address=address)
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elif datatype == DataType.FLOAT:
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if allocate and self.name == "ZP":
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raise SymbolError("floats cannot be stored in the ZP")
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self.symbols[name] = VariableDef(self.name, name, sourceref, DataType.FLOAT, allocate,
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value=value, length=1, address=address)
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elif datatype == DataType.BYTEARRAY:
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self.symbols[name] = VariableDef(self.name, name, sourceref, DataType.BYTEARRAY, allocate,
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value=value, length=length, address=address)
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elif datatype == DataType.WORDARRAY:
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self.symbols[name] = VariableDef(self.name, name, sourceref, DataType.WORDARRAY, allocate,
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value=value, length=length, address=address)
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elif datatype in (DataType.STRING, DataType.STRING_P, DataType.STRING_S, DataType.STRING_PS):
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self.symbols[name] = VariableDef(self.name, name, sourceref, datatype, True,
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value=value, length=len(value)) # type: ignore
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elif datatype == DataType.MATRIX:
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assert isinstance(matrixsize, tuple)
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length = matrixsize[0] * matrixsize[1]
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self.symbols[name] = VariableDef(self.name, name, sourceref, DataType.MATRIX, allocate,
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value=value, length=length, address=address, matrixsize=matrixsize)
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else:
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raise ValueError("unknown type " + str(datatype))
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self.eval_dict = None
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def define_sub(self, name: str, sourceref: SourceRef,
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parameters: Sequence[Tuple[str, str]], returnvalues: Set[str], address: Optional[int]) -> None:
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self.check_identifier_valid(name, sourceref)
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self.symbols[name] = SubroutineDef(self.name, name, sourceref, parameters, returnvalues, address)
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def define_label(self, name: str, sourceref: SourceRef) -> None:
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self.check_identifier_valid(name, sourceref)
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self.symbols[name] = LabelDef(self.name, name, sourceref, False)
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def define_scope(self, scope: 'SymbolTable', sourceref: SourceRef) -> None:
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self.check_identifier_valid(scope.name, sourceref)
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self.symbols[scope.name] = scope
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def define_constant(self, name: str, sourceref: SourceRef, datatype: DataType, *,
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length: int=0, value: PrimitiveType=0) -> None:
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# this defines a new constant and also checks if the value is allowed for the data type.
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assert value is not None
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self.check_identifier_valid(name, sourceref)
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if type(value) in (int, float):
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_, value = coerce_value(sourceref, datatype, value) # type: ignore
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range_error = check_value_in_range(datatype, "", length, value)
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if range_error:
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raise ValueError(range_error)
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if datatype in (DataType.BYTE, DataType.WORD, DataType.FLOAT):
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self.symbols[name] = ConstantDef(self.name, name, sourceref, datatype, value=value, length=length or 1)
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elif datatype in STRING_DATATYPES:
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strlen = len(value) # type: ignore
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self.symbols[name] = ConstantDef(self.name, name, sourceref, datatype, value=value, length=strlen)
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else:
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raise ValueError("invalid data type for constant: " + str(datatype))
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self.eval_dict = None
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def merge_roots(self, other_root: 'SymbolTable') -> None:
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for name, thing in other_root.symbols.items():
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if isinstance(thing, SymbolTable):
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self.define_scope(thing, thing.owning_block.sourceref)
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def print_table(self, summary_only: bool=False) -> None:
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if summary_only:
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def count_symbols(symbols: 'SymbolTable') -> int:
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count = 0
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for s in symbols.symbols.values():
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if isinstance(s, SymbolTable):
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count += count_symbols(s)
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else:
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count += 1
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return count
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print("number of symbols:", count_symbols(self))
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else:
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def print_symbols(symbols: 'SymbolTable', level: int) -> None:
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indent = '\t' * level
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print("\n" + indent + "BLOCK:", symbols.name)
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for name, s in sorted(symbols.symbols.items(), key=lambda x: getattr(x[1], "sourceref", ("", 0))):
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if isinstance(s, SymbolTable):
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print_symbols(s, level + 1)
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elif isinstance(s, SubroutineDef):
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print(indent * 2 + "SUB: " + s.name, s.sourceref, sep="\t")
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elif isinstance(s, LabelDef):
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print(indent * 2 + "LABEL: " + s.name, s.sourceref, sep="\t")
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elif isinstance(s, VariableDef):
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print(indent * 2 + "VAR: " + s.name, s.sourceref, s.type, sep="\t")
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elif isinstance(s, ConstantDef):
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print(indent * 2 + "CONST: " + s.name, s.sourceref, s.type, sep="\t")
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else:
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raise TypeError("invalid symbol def type", s)
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print("\nSymbols defined in the symbol table:")
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print("------------------------------------")
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print_symbols(self, 0)
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print()
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class Eval_symbol_dict(dict):
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def __init__(self, symboltable: SymbolTable, constants: bool=True) -> None:
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super().__init__()
|
|
self._symboltable = symboltable
|
|
self._constants = constants
|
|
|
|
def __getattr__(self, name):
|
|
return self.__getitem__(name)
|
|
|
|
def __getitem__(self, name):
|
|
if name[0] != '_' and name in builtins.__dict__:
|
|
return builtins.__dict__[name]
|
|
try:
|
|
scope, symbol = self._symboltable.lookup(name)
|
|
except (LookupError, SymbolError):
|
|
# attempt lookup from global scope
|
|
global_scope = self._symboltable
|
|
while global_scope.parent:
|
|
global_scope = global_scope.parent
|
|
scope, symbol = global_scope.lookup(name, True)
|
|
if self._constants:
|
|
if isinstance(symbol, ConstantDef):
|
|
return symbol.value
|
|
elif isinstance(symbol, VariableDef):
|
|
return symbol.value
|
|
elif inspect.isbuiltin(symbol):
|
|
return symbol
|
|
elif isinstance(symbol, SymbolTable):
|
|
return symbol.as_eval_dict()
|
|
else:
|
|
raise SymbolError("invalid datatype referenced" + repr(symbol))
|
|
else:
|
|
raise SymbolError("no support for non-constant expression evaluation yet")
|
|
|
|
|
|
def coerce_value(sourceref: SourceRef, datatype: DataType, value: PrimitiveType) -> Tuple[bool, PrimitiveType]:
|
|
# if we're a BYTE type, and the value is a single character, convert it to the numeric value
|
|
if datatype in (DataType.BYTE, DataType.BYTEARRAY, DataType.MATRIX) and isinstance(value, str):
|
|
if len(value) == 1:
|
|
return True, char_to_bytevalue(value)
|
|
# if we're an integer value and the passed value is float, truncate it (and give a warning)
|
|
if datatype in (DataType.BYTE, DataType.WORD, DataType.MATRIX) and type(value) is float:
|
|
frac = math.modf(value) # type:ignore
|
|
if frac != 0:
|
|
print("warning: {}: Float value truncated.".format(sourceref))
|
|
return True, int(value)
|
|
return False, value
|
|
|
|
|
|
def check_value_in_range(datatype: DataType, register: str, length: int, value: PrimitiveType) -> Optional[str]:
|
|
if register:
|
|
if register in REGISTER_BYTES:
|
|
if value < 0 or value > 0xff: # type: ignore
|
|
return "value out of range, must be (unsigned) byte for a single register"
|
|
elif register in REGISTER_WORDS:
|
|
if value is None and datatype in (DataType.BYTE, DataType.WORD):
|
|
return None
|
|
if value < 0 or value > 0xffff: # type: ignore
|
|
return "value out of range, must be (unsigned) word for 2 combined registers"
|
|
else:
|
|
return "strange register"
|
|
elif datatype in (DataType.BYTE, DataType.BYTEARRAY, DataType.MATRIX):
|
|
if value is None and datatype == DataType.BYTE:
|
|
return None
|
|
if value < 0 or value > 0xff: # type: ignore
|
|
return "value out of range, must be (unsigned) byte"
|
|
elif datatype in (DataType.WORD, DataType.WORDARRAY):
|
|
if value is None and datatype in (DataType.BYTE, DataType.WORD):
|
|
return None
|
|
if value < 0 or value > 0xffff: # type: ignore
|
|
return "value out of range, must be (unsigned) word"
|
|
elif datatype in STRING_DATATYPES:
|
|
if type(value) is not str:
|
|
return "value must be a string"
|
|
elif datatype == DataType.FLOAT:
|
|
if type(value) not in (int, float):
|
|
return "value must be a number"
|
|
else:
|
|
raise SymbolError("missing value check for type", datatype, register, length, value)
|
|
return None # all ok !
|
|
|
|
|
|
def char_to_bytevalue(character: str, petscii: bool=True) -> int:
|
|
assert len(character) == 1
|
|
if petscii:
|
|
return ord(character.translate(ascii_to_petscii_trans))
|
|
else:
|
|
raise NotImplementedError("screencode conversion not yet implemented for chars")
|
|
|
|
|
|
# ASCII/UNICODE-to-PETSCII translation table
|
|
# Unicode symbols supported that map to a PETSCII character: £ ↑ ← ♠ ♥ ♦ ♣ π ● ○ and various others
|
|
ascii_to_petscii_trans = str.maketrans({
|
|
'\f': 147, # form feed becomes ClearScreen
|
|
'\n': 13, # line feed becomes a RETURN
|
|
'\r': 17, # CR becomes CursorDown
|
|
'a': 65,
|
|
'b': 66,
|
|
'c': 67,
|
|
'd': 68,
|
|
'e': 69,
|
|
'f': 70,
|
|
'g': 71,
|
|
'h': 72,
|
|
'i': 73,
|
|
'j': 74,
|
|
'k': 75,
|
|
'l': 76,
|
|
'm': 77,
|
|
'n': 78,
|
|
'o': 79,
|
|
'p': 80,
|
|
'q': 81,
|
|
'r': 82,
|
|
's': 83,
|
|
't': 84,
|
|
'u': 85,
|
|
'v': 86,
|
|
'w': 87,
|
|
'x': 88,
|
|
'y': 89,
|
|
'z': 90,
|
|
'A': 97,
|
|
'B': 98,
|
|
'C': 99,
|
|
'D': 100,
|
|
'E': 101,
|
|
'F': 102,
|
|
'G': 103,
|
|
'H': 104,
|
|
'I': 105,
|
|
'J': 106,
|
|
'K': 107,
|
|
'L': 108,
|
|
'M': 109,
|
|
'N': 110,
|
|
'O': 111,
|
|
'P': 112,
|
|
'Q': 113,
|
|
'R': 114,
|
|
'S': 115,
|
|
'T': 116,
|
|
'U': 117,
|
|
'V': 118,
|
|
'W': 119,
|
|
'X': 120,
|
|
'Y': 121,
|
|
'Z': 122,
|
|
'{': 179, # left squiggle
|
|
'}': 235, # right squiggle
|
|
'£': 92, # pound currency sign
|
|
'^': 94, # up arrow
|
|
'~': 126, # pi math symbol
|
|
'π': 126, # pi symbol
|
|
'`': 39, # single quote
|
|
'✓': 250, # check mark
|
|
|
|
'|': 221, # vertical bar
|
|
'│': 221, # vertical bar
|
|
'─': 96, # horizontal bar
|
|
'┼': 123, # vertical and horizontal bar
|
|
|
|
'↑': 94, # up arrow
|
|
'←': 95, # left arrow
|
|
|
|
'▔': 163, # upper bar
|
|
'_': 164, # lower bar (underscore)
|
|
'▁': 164, # lower bar
|
|
'▎': 165, # left bar
|
|
|
|
'♠': 97, # spades
|
|
'●': 113, # circle
|
|
'♥': 115, # hearts
|
|
'○': 119, # open circle
|
|
'♣': 120, # clubs
|
|
'♦': 122, # diamonds
|
|
|
|
'├': 171, # vertical and right
|
|
'┤': 179, # vertical and left
|
|
'┴': 177, # horiz and up
|
|
'┬': 178, # horiz and down
|
|
'└': 173, # up right
|
|
'┐': 174, # down left
|
|
'┌': 175, # down right
|
|
'┘': 189, # up left
|
|
'▗': 172, # block lr
|
|
'▖': 187, # block ll
|
|
'▝': 188, # block ur
|
|
'▘': 190, # block ul
|
|
'▚': 191, # block ul and lr
|
|
'▌': 161, # left half
|
|
'▄': 162, # lower half
|
|
'▒': 230, # raster
|
|
})
|