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400835ea16
Introducing a new file, stacking.py, that takes over several responsibilities related to symbolic evaluation of push/pop operations, with more generality.
102 lines
3.2 KiB
Python
102 lines
3.2 KiB
Python
import dataclasses
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from formatting import Formatter
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import lexer as lx
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import parsing
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@dataclasses.dataclass
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class InstructionFlags:
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"""Construct and manipulate instruction flags"""
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HAS_ARG_FLAG: bool
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HAS_CONST_FLAG: bool
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HAS_NAME_FLAG: bool
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HAS_JUMP_FLAG: bool
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HAS_FREE_FLAG: bool
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HAS_LOCAL_FLAG: bool
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def __post_init__(self):
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self.bitmask = {name: (1 << i) for i, name in enumerate(self.names())}
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@staticmethod
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def fromInstruction(instr: parsing.Node):
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has_free = (
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variable_used(instr, "PyCell_New")
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or variable_used(instr, "PyCell_GET")
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or variable_used(instr, "PyCell_SET")
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)
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return InstructionFlags(
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HAS_ARG_FLAG=variable_used(instr, "oparg"),
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HAS_CONST_FLAG=variable_used(instr, "FRAME_CO_CONSTS"),
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HAS_NAME_FLAG=variable_used(instr, "FRAME_CO_NAMES"),
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HAS_JUMP_FLAG=variable_used(instr, "JUMPBY"),
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HAS_FREE_FLAG=has_free,
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HAS_LOCAL_FLAG=(
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variable_used(instr, "GETLOCAL") or variable_used(instr, "SETLOCAL")
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)
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and not has_free,
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)
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@staticmethod
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def newEmpty():
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return InstructionFlags(False, False, False, False, False, False)
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def add(self, other: "InstructionFlags") -> None:
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for name, value in dataclasses.asdict(other).items():
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if value:
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setattr(self, name, value)
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def names(self, value=None) -> list[str]:
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if value is None:
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return list(dataclasses.asdict(self).keys())
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return [n for n, v in dataclasses.asdict(self).items() if v == value]
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def bitmap(self) -> int:
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flags = 0
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for name in self.names():
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if getattr(self, name):
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flags |= self.bitmask[name]
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return flags
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@classmethod
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def emit_macros(cls, out: Formatter):
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flags = cls.newEmpty()
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for name, value in flags.bitmask.items():
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out.emit(f"#define {name} ({value})")
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for name, value in flags.bitmask.items():
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out.emit(
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f"#define OPCODE_{name[:-len('_FLAG')]}(OP) "
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f"(_PyOpcode_opcode_metadata[OP].flags & ({name}))"
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)
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def variable_used(node: parsing.Node, name: str) -> bool:
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"""Determine whether a variable with a given name is used in a node."""
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return any(
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token.kind == "IDENTIFIER" and token.text == name for token in node.tokens
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)
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def variable_used_unspecialized(node: parsing.Node, name: str) -> bool:
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"""Like variable_used(), but skips #if ENABLE_SPECIALIZATION blocks."""
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tokens: list[lx.Token] = []
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skipping = False
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for i, token in enumerate(node.tokens):
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if token.kind == "MACRO":
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text = "".join(token.text.split())
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# TODO: Handle nested #if
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if text == "#if":
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if (
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i + 1 < len(node.tokens)
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and node.tokens[i + 1].text == "ENABLE_SPECIALIZATION"
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):
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skipping = True
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elif text in ("#else", "#endif"):
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skipping = False
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if not skipping:
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tokens.append(token)
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return any(token.kind == "IDENTIFIER" and token.text == name for token in tokens)
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