629 lines
34 KiB
Python
629 lines
34 KiB
Python
from __future__ import annotations
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from typing import Any
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import re
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import ast
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import llvmlite.ir as ir
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from llvmlite.ir.values import _Undefined
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from lib.includes import t as _t
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class StructGenMixin:
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def _get_align(self, llvm_type: ir.Type) -> int:
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if isinstance(llvm_type, ir.IntType):
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return max(1, llvm_type.width // 8)
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if isinstance(llvm_type, ir.FloatType):
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return 4
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if isinstance(llvm_type, ir.DoubleType):
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return 8
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if isinstance(llvm_type, ir.PointerType):
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return self.ptr_size
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if isinstance(llvm_type, ir.ArrayType):
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return self._get_align(llvm_type.element)
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if isinstance(llvm_type, ir.LiteralStructType):
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return max((self._get_align(f) for f in llvm_type.elements), default=1)
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if isinstance(llvm_type, ir.IdentifiedStructType):
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if llvm_type.elements is None or len(llvm_type.elements) == 0:
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return self.ptr_size # opaque struct, assume pointer alignment
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return max((self._get_align(f) for f in llvm_type.elements), default=1)
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if isinstance(llvm_type, ir.VoidType):
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return 0
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return 4
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def _resolve_opaque_struct(self, llvm_type: ir.Type) -> ir.Type:
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"""尝试从 Gen.structs 中查找已解析的同名 struct，解决跨模块 struct 类型对象不一致的问题"""
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if not isinstance(llvm_type, ir.IdentifiedStructType):
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return llvm_type
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if llvm_type.elements is not None and len(llvm_type.elements) > 0:
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return llvm_type
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# opaque struct，尝试通过名称在 Gen.structs 中查找已解析的版本
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st_name: str
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try:
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st_name = llvm_type.name
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except Exception:
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return llvm_type
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if not st_name:
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return llvm_type
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# 提取短名称
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short_name: str = st_name
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if '.' in st_name:
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short_name = st_name.split('.', 1)[1]
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# 尝试短名称查找
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if short_name in self.structs:
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resolved: ir.IdentifiedStructType = self.structs[short_name]
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if isinstance(resolved, ir.IdentifiedStructType) and resolved.elements is not None and len(resolved.elements) > 0:
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return resolved
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# 尝试全名查找
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if st_name in self.structs:
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resolved: ir.IdentifiedStructType = self.structs[st_name]
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if isinstance(resolved, ir.IdentifiedStructType) and resolved.elements is not None and len(resolved.elements) > 0:
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return resolved
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# 尝试通过导入处理器从 stub 文件加载 struct 定义
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import_handler: Any = self._import_handler_ref
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if import_handler is not None:
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try:
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import_handler._TryLoadStructFromStub(short_name, self)
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except Exception:
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pass
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# 加载后再次查找
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if short_name in self.structs:
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resolved = self.structs[short_name]
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if isinstance(resolved, ir.IdentifiedStructType) and resolved.elements is not None and len(resolved.elements) > 0:
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return resolved
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if st_name in self.structs:
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resolved = self.structs[st_name]
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if isinstance(resolved, ir.IdentifiedStructType) and resolved.elements is not None and len(resolved.elements) > 0:
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return resolved
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return llvm_type
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def _get_struct_size(self, llvm_type: ir.Type) -> int:
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if isinstance(llvm_type, ir.IntType):
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return max(1, llvm_type.width // 8)
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if isinstance(llvm_type, ir.FloatType):
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return 4
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if isinstance(llvm_type, ir.DoubleType):
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return 8
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if isinstance(llvm_type, ir.PointerType):
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return self.ptr_size
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if isinstance(llvm_type, ir.ArrayType):
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return self._get_struct_size(llvm_type.element) * llvm_type.count
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if isinstance(llvm_type, ir.LiteralStructType):
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total: int = 0
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max_align: int = 1
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for f in llvm_type.fields:
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fa: int = self._get_align(f)
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fs: int = self._get_struct_size(f)
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max_align = max(max_align, fa)
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if fa > 1:
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total = (total + fa - 1) // fa * fa
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total += fs
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if max_align > 1:
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total = (total + max_align - 1) // max_align * max_align
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return total
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if isinstance(llvm_type, ir.IdentifiedStructType):
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# 尝试解析 opaque struct 为已注册的版本
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llvm_type = self._resolve_opaque_struct(llvm_type)
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if llvm_type.elements is None or len(llvm_type.elements) == 0:
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return self.ptr_size # opaque struct, assume pointer size
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total: int = 0
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max_align: int = 1
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for f in llvm_type.elements:
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fa: int = self._get_align(f)
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fs: int = self._get_struct_size(f)
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max_align = max(max_align, fa)
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if fa > 1:
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total = (total + fa - 1) // fa * fa
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total += fs
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if max_align > 1:
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total = (total + max_align - 1) // max_align * max_align
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return total
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return 4
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@staticmethod
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def _strip_unnecessary_quotes(ir_str: str) -> str:
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def _unquote(m: re.Match) -> str:
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prefix: str = m.group(1)
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name: str = m.group(2)
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if '.' in name:
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return m.group(0)
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if re.match(r'^[a-zA-Z_$][a-zA-Z0-9_$]*$', name):
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return prefix + name
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return m.group(0)
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return re.sub(r'([@%])"([^"]+)"', _unquote, ir_str)
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def finalize(self) -> str:
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self._set_Vtable_initializers()
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self._fix_global_var_init()
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ir_text: str
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try:
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ir_text = str(self.module)
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except TypeError as e:
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for func in self.module.functions:
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for block in func.blocks:
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for instr in block.instructions:
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try:
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str(instr)
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except TypeError as te:
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pass
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raise
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ir_text = self._strip_unnecessary_quotes(ir_text)
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struct_defs: list[str] = []
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struct_names: set[str] = set()
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for ClassName, struct_type in self.structs.items():
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if isinstance(struct_type, ir.IdentifiedStructType):
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sname: str = struct_type.name
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sname_ir: str
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if sname[0].isdigit() or '.' in sname or not sname.replace('_', '').replace('.', '').isalnum():
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sname_ir = f'%"{sname}"'
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else:
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sname_ir = f'%{sname}'
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if struct_type.elements is None or len(struct_type.elements) == 0:
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if ClassName not in self.typedef_int_widths:
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struct_names.add(sname)
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struct_defs.append(f'{sname_ir} = type opaque')
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continue
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elems: str = ', '.join(str(e) for e in struct_type.elements)
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if struct_type.packed:
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struct_defs.append(f'{sname_ir} = type <{{ {elems} }}>')
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else:
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struct_defs.append(f'{sname_ir} = type {{ {elems} }}')
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struct_names.add(sname)
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if struct_defs:
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lines: list[str] = ir_text.split('\n')
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filtered: list[str] = []
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for line in lines:
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stripped: str = line.strip()
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skip: bool = False
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for name in struct_names:
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patterns: list[str]
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if name[0].isdigit() or '.' in name or not name.replace('_', '').replace('.', '').isalnum():
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patterns = [f'%"{name}" = type', f'%"{name}"=type', f'%{name} = type', f'%{name}=type']
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else:
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patterns = [f'%{name} = type', f'%{name}= type', f'%{name}=type']
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for p in patterns:
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if stripped.startswith(p):
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skip = True
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break
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if skip:
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break
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if not skip:
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filtered.append(line)
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ir_text = '\n'.join(filtered)
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header_end: int = ir_text.find('\ndefine')
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if header_end == -1:
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header_end = ir_text.find('\ndeclare')
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if header_end == -1:
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header_end = ir_text.find('\n@')
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if header_end == -1:
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header_end = len(ir_text)
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insert_pos: int = ir_text.rfind('\n', 0, header_end)
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if insert_pos == -1:
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insert_pos = header_end
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struct_block: str = '\n'.join(struct_defs) + '\n'
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ir_text = ir_text[:insert_pos + 1] + struct_block + ir_text[insert_pos + 1:]
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for name in struct_names:
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if name[0].isdigit() or '.' in name:
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ir_text = re.sub(
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r'%' + re.escape(name) + r'(?=[^a-zA-Z0-9_$\.]|$)',
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r'%"' + name + r'"',
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ir_text
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)
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return ir_text
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def _generate_structs(self) -> None:
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all_classes: set[str] = set(self.class_methods.keys()) | set(self.class_members.keys())
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preserved_structs: dict[str, ir.IdentifiedStructType] = {}
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for name, st in self.structs.items():
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if name not in all_classes:
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preserved_structs[name] = st
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elif isinstance(st, ir.IdentifiedStructType):
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preserved_structs[name] = st
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self.structs.clear()
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for name, st in preserved_structs.items():
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self.structs[name] = st
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# Step 1: 先为所有类创建空的 struct，确保后面可以正确引用
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all_classes = set(self.class_methods.keys()) | set(self.class_members.keys())
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for ClassName in all_classes:
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is_packed: bool = ClassName in self.class_packed
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if self.SymbolTable:
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Entry = self.SymbolTable.lookup(ClassName)
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if Entry and Entry.IsExceptionClass:
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continue
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# 注意：类名可能与 CEnum 成员名冲突（如 ASTKind.Module 枚举成员与 Module 类同名）
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# 如果 ClassName 在 class_methods 中，表明是 _EmitClassLlvm 显式处理的常规类，
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# 不应被 IsEnum/IsTypedef 检查跳过
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if Entry and Entry.IsEnum and ClassName not in self.class_methods:
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if not Entry.IsRenum:
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continue
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if Entry and Entry.IsTypedef and ClassName not in self.class_methods:
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if Entry.BaseType and not isinstance(Entry.BaseType, (type(None),)):
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if not isinstance(Entry.BaseType, (_t._CTypedef,)):
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continue
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if ClassName in self.structs:
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if is_packed:
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self.structs[ClassName].packed = True
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continue
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# 修复跨模块类型定义冲突：如果类是从其他模块导入的（已在 class_sha1_map 注册），
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# 必须使用导入的 source_sha1 作为前缀，而非本地模块的 sha1。
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# 否则会创建缺少基类字段（如 GSListNode.Next）的本地类型定义，
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# 导致字段索引错位 → 访问违规崩溃。
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_imported_sha1: str = self.class_sha1_map.get(ClassName, '')
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if _imported_sha1:
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mangled_name: str = f"{_imported_sha1}.{ClassName}"
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else:
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mangled_name: str = self._mangle_name(ClassName)
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struct_type: ir.IdentifiedStructType = ir.IdentifiedStructType(self.module, mangled_name, packed=is_packed)
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self.structs[ClassName] = struct_type
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# Step 2: 解析跨模块的成员类型
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for ClassName, annotations in self.class_member_annotations.items():
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if ClassName not in self.class_members:
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continue
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for i, (member_name, member_type) in enumerate(self.class_members[ClassName]):
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if member_name in annotations:
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annotation: Any = annotations[member_name]
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ResolvedType: ir.Type | None = None
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if isinstance(annotation, ast.Attribute):
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ClassTypeName: str = annotation.attr
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if ClassTypeName in self.structs:
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ResolvedType = self.structs[ClassTypeName]
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elif isinstance(annotation, ast.BinOp) and isinstance(annotation.op, ast.BitOr):
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left: Any = annotation.left
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if isinstance(left, ast.Attribute):
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ClassTypeName: str = left.attr
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if ClassTypeName in self.structs:
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ResolvedType = self.structs[ClassTypeName]
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if ResolvedType:
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self.class_members[ClassName][i] = (member_name, ResolvedType)
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struct_name_map: dict[str, ir.IdentifiedStructType] = {}
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for struct_name, struct in self.structs.items():
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try:
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struct_name_map[struct.name] = struct
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except AssertionError:
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struct_name_map[struct_name] = struct
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orig: Any = getattr(struct, '_original_name', None)
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if orig:
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struct_name_map[orig] = struct
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# Step 3: 更新成员类型，确保使用正确的 mangled struct 引用
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for ClassName in all_classes:
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if ClassName not in self.class_members:
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continue
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for i, (member_name, member_type) in enumerate(self.class_members[ClassName]):
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if isinstance(member_type, ir.PointerType):
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pointee: ir.Type = member_type.pointee
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if isinstance(pointee, ir.IdentifiedStructType):
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pname: str | None
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try:
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pname = pointee.name
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except AssertionError:
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pname = None
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struct: ir.IdentifiedStructType | None = struct_name_map.get(pname) if pname else None
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if struct is None:
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orig: Any = getattr(pointee, '_original_name', None)
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struct = struct_name_map.get(orig) if orig else None
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if struct is not None:
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self.class_members[ClassName][i] = (member_name, ir.PointerType(struct))
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else:
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raw_name: str = pname or ''
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if raw_name.startswith('struct.'):
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raw_name = raw_name[7:]
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new_struct: ir.IdentifiedStructType = self._get_or_create_struct(raw_name)
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self.class_members[ClassName][i] = (member_name, ir.PointerType(new_struct))
|
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elif isinstance(member_type, ir.IdentifiedStructType):
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mname: str | None
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try:
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mname = member_type.name
|
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except AssertionError:
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||
mname = None
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struct: ir.IdentifiedStructType | None = struct_name_map.get(mname) if mname else None
|
||
if struct is None:
|
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orig: Any = getattr(member_type, '_original_name', None)
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struct = struct_name_map.get(orig) if orig else None
|
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if struct is not None:
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||
self.class_members[ClassName][i] = (member_name, struct)
|
||
else:
|
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raw_name: str = mname or ''
|
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if raw_name.startswith('struct.'):
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raw_name = raw_name[7:]
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new_struct: ir.IdentifiedStructType = self._get_or_create_struct(raw_name)
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self.class_members[ClassName][i] = (member_name, new_struct)
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||
|
||
# Step 4: 创建最终的 structs 并设置正确的成员类型
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for ClassName in all_classes:
|
||
if self.SymbolTable:
|
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Entry = self.SymbolTable.lookup(ClassName)
|
||
if Entry and Entry.IsExceptionClass:
|
||
continue
|
||
# 注意：类名可能与 CEnum 成员名冲突（如 ASTKind.Constant 枚举成员与 Constant 类同名）
|
||
# 如果 ClassName 在 class_methods 中，表明是 _EmitClassLlvm 显式处理的常规类，
|
||
# 不应被 IsEnum 检查跳过（与 Step 1 的守卫保持一致）
|
||
if Entry and Entry.IsEnum and ClassName not in self.class_methods:
|
||
if not Entry.IsRenum:
|
||
continue
|
||
existing_st: ir.IdentifiedStructType | None = self.structs.get(ClassName)
|
||
if isinstance(existing_st, ir.IdentifiedStructType) and existing_st.elements is not None and len(existing_st.elements) > 0:
|
||
# 治本修复：检查 struct body 是否不完整（元素数少于 class_members + vtable 预期）。
|
||
# 常见于跨模块继承：子类 struct 在父类 class_members 加载前从 stub 生成，
|
||
# stub 中的定义可能不完整或类型不正确（如 GSList* 代替 AST*、i8* 代替 i32）。
|
||
# 此处检测到不完整后清除 _elements 和 stub 缓存，让后续代码重新从 stub 加载。
|
||
_has_vtable_precheck: bool = ClassName in self.class_vtable or ClassName in self._cross_module_vtable_classes
|
||
if not _has_vtable_precheck:
|
||
_p_pre: str | None = self.class_parent.get(ClassName)
|
||
while _p_pre:
|
||
if _p_pre in self.class_vtable or _p_pre in self._cross_module_vtable_classes:
|
||
_has_vtable_precheck = True
|
||
break
|
||
_p_pre = self.class_parent.get(_p_pre)
|
||
_expected_count_pre: int = len(self.class_members.get(ClassName, [])) + (1 if _has_vtable_precheck else 0)
|
||
# has_vtable 时，首字段必须是 i8*（vtable 指针）。
|
||
# 若首字段非指针（如 i8 占位符），struct body 不完整，需清除重新加载。
|
||
_vtable_first_ok: bool = True
|
||
if _has_vtable_precheck and len(existing_st.elements) > 0:
|
||
_vtable_first_ok = isinstance(existing_st.elements[0], ir.PointerType)
|
||
# 检测 T* 占位类型（未特化的泛型类型参数）。
|
||
# 当 struct 包含 T* 字段时（如 BasicBlock 继承 GSListNode[BasicBlock] 但 stub 未特化），
|
||
# 说明 stub 使用了未特化的基类，需清除重新生成。
|
||
_has_t_placeholder_pre: bool = False
|
||
for _elem_pre in existing_st.elements:
|
||
if isinstance(_elem_pre, ir.PointerType) and isinstance(_elem_pre.pointee, ir.IdentifiedStructType):
|
||
_pname_pre: str = _elem_pre.pointee.name
|
||
_short_pre: str = _pname_pre.rsplit('.', 1)[-1] if '.' in _pname_pre else _pname_pre
|
||
if _short_pre == 'T':
|
||
_has_t_placeholder_pre = True
|
||
break
|
||
if len(existing_st.elements) >= _expected_count_pre and _vtable_first_ok and not _has_t_placeholder_pre:
|
||
if ClassName in self.class_packed and not existing_st.packed:
|
||
existing_st.packed = True
|
||
continue
|
||
# struct body 不完整，清除 _elements 和 stub 缓存以便重新加载
|
||
existing_st._elements = None
|
||
_import_handler_pre: Any = self._import_handler_ref
|
||
if _import_handler_pre is not None:
|
||
_cache_key_pre: tuple = (id(self), ClassName)
|
||
if _cache_key_pre in _import_handler_pre._struct_Load_cache:
|
||
del _import_handler_pre._struct_Load_cache[_cache_key_pre]
|
||
has_vtable: bool = ClassName in self.class_vtable or ClassName in self._cross_module_vtable_classes
|
||
if not has_vtable:
|
||
p: str | None = self.class_parent.get(ClassName)
|
||
while p:
|
||
if p in self.class_vtable or p in self._cross_module_vtable_classes:
|
||
has_vtable = True
|
||
self.class_vtable.add(ClassName)
|
||
break
|
||
p = self.class_parent.get(p)
|
||
has_bitfield: bool = ClassName in self.class_member_bitfields and any(
|
||
self.class_member_bitfields[ClassName].get(name, 0) > 0
|
||
for name, _ in self.class_members.get(ClassName, [])
|
||
)
|
||
all_members: list[tuple[str, ir.Type]] = self.class_members.get(ClassName, [])
|
||
# 跳过正在发射中且成员尚未填充的类（递归特化时避免过早设置空 body）
|
||
if not all_members and not has_vtable and ClassName in self._classes_in_progress:
|
||
continue
|
||
# 字段收集期间触发的嵌套 _generate_structs：class_members 可能不完整，
|
||
# set_body 只能调用一次，跳过等字段收集完成后再设置 body
|
||
if ClassName in self._collecting_members_set:
|
||
continue
|
||
all_bitfield: bool = all(
|
||
self.class_member_bitfields.get(ClassName, {}).get(name, 0) > 0
|
||
for name, _ in all_members
|
||
) if all_members else False
|
||
|
||
mangled_name: str = self._mangle_name(ClassName)
|
||
|
||
member_types: list[ir.Type]
|
||
if has_bitfield and all_bitfield:
|
||
total_bits: int = sum(self.class_member_bitfields.get(ClassName, {}).get(name, 0)
|
||
for name, _ in all_members)
|
||
storage_type: ir.IntType
|
||
if total_bits <= 8:
|
||
storage_type = ir.IntType(8)
|
||
elif total_bits <= 16:
|
||
storage_type = ir.IntType(16)
|
||
elif total_bits <= 32:
|
||
storage_type = ir.IntType(32)
|
||
else:
|
||
storage_type = ir.IntType(64)
|
||
member_types = [storage_type]
|
||
bitfield_offsets: dict[str, int] = {}
|
||
current_bit_offset: int = 0
|
||
for name, _ in all_members:
|
||
bit_width: int = self.class_member_bitfields.get(ClassName, {}).get(name, 0)
|
||
bitfield_offsets[name] = current_bit_offset
|
||
current_bit_offset += bit_width
|
||
self.class_member_bitoffsets[ClassName] = bitfield_offsets
|
||
else:
|
||
member_types = []
|
||
if has_vtable:
|
||
member_types.append(ir.PointerType(ir.IntType(8)))
|
||
if ClassName in self.class_members:
|
||
for _, member_type in self.class_members[ClassName]:
|
||
if member_type is None:
|
||
member_type = ir.IntType(32)
|
||
member_types.append(member_type)
|
||
else:
|
||
if has_vtable:
|
||
# has_vtable 但 class_members 为空（跨模块导入类）：
|
||
# 保持 member_types 为空（[i8*] 占位会导致 stub 加载跳过，
|
||
# 因为 set_body 后 is_opaque=False）。让 struct 保持 opaque，
|
||
# 由 _TryLoadStructFromStub 设置完整 body。
|
||
member_types = []
|
||
else:
|
||
# 无 vtable 且 class_members 为空：常见于 register_method 早期
|
||
# 调用 _generate_structs（此时 class_members[ClassName]=[] 但尚未
|
||
# 填充实际字段）。保持 opaque，避免 set_body(*[i8]) 永久损坏 struct
|
||
# （llvmlite 的 set_body 只能调用一次）。后续 _generate_structs 调用
|
||
# 会从 class_members 或 stub 设置正确 body。
|
||
member_types = []
|
||
|
||
# 获取之前创建的 struct 并设置成员
|
||
struct_type: ir.IdentifiedStructType = self.structs[ClassName]
|
||
if ClassName in self.class_packed:
|
||
struct_type.packed = True
|
||
# 只在未设置 body 时设置，避免重复定义错误
|
||
if struct_type.elements is None:
|
||
# 跨模块 struct 的 class_members 可能不完整（当前模块只解析了部分字段），
|
||
# 优先从 stub.ll 加载完整定义。set_body 只能对 opaque struct 调用一次，
|
||
# 若用不完整 class_members 设置 body，后续无法修正，会导致 GEP 越界。
|
||
# 但本地定义的类（_classes_in_progress）不从 stub 加载，因为 stub 可能
|
||
# 来自同名导入类，其 vtable 状态与本地定义不同（@t.NoVTable 冲突）
|
||
import_handler: Any = self._import_handler_ref
|
||
if import_handler is not None and ClassName not in self._classes_in_progress:
|
||
try:
|
||
# 传入 source_sha1 确保从正确的 stub 文件加载完整定义
|
||
_src_sha1: str = self.class_sha1_map.get(ClassName, '')
|
||
import_handler._TryLoadStructFromStub(ClassName, self, source_sha1=_src_sha1 or None)
|
||
except Exception:
|
||
pass
|
||
struct_type = self.structs.get(ClassName, struct_type)
|
||
# 检测 stub body 中的 T* 占位类型（未特化的泛型类型参数）。
|
||
# 若 stub 使用了未特化的基类（如 GSListNode 而非 GSListNode[BasicBlock]），
|
||
# 清除 _elements 让 set_body 用正确的 class_members 重新设置。
|
||
if struct_type.elements is not None and member_types:
|
||
_has_t_placeholder_post: bool = False
|
||
for _elem_post in struct_type.elements:
|
||
if isinstance(_elem_post, ir.PointerType) and isinstance(_elem_post.pointee, ir.IdentifiedStructType):
|
||
_pname_post: str = _elem_post.pointee.name
|
||
_short_post: str = _pname_post.rsplit('.', 1)[-1] if '.' in _pname_post else _pname_post
|
||
if _short_post == 'T':
|
||
_has_t_placeholder_post = True
|
||
break
|
||
if _has_t_placeholder_post:
|
||
struct_type._elements = None
|
||
if struct_type.elements is None:
|
||
# 防御性检查：member_types 为空时不调用 set_body。
|
||
# set_body(*[]) 会设置 elements=() 使 is_opaque=False，
|
||
# 后续无法再次 set_body（llvmlite 限制），导致跨模块类型永久损坏。
|
||
# 根因：register_method 在 class_members[ClassName]=[] 时立即调用
|
||
# _generate_structs，此时 member_types 为空。保持 opaque 状态，
|
||
# 让后续 _TryLoadStructFromStub 能正确设置 body。
|
||
if member_types:
|
||
struct_type.set_body(*member_types)
|
||
|
||
def _create_Vtable_globals(self) -> None:
|
||
for ClassName, methods in self.class_methods.items():
|
||
if ClassName in self.Vtables:
|
||
continue
|
||
if not methods:
|
||
continue
|
||
if ClassName not in self.class_vtable and ClassName not in self._cross_module_vtable_classes:
|
||
continue
|
||
# 跳过正在发射中的类：它们的方法列表可能还不完整（如继承方法已添加但自有方法未添加），
|
||
# 此时创建 vtable 会导致大小不匹配。这些类的 vtable 会在其 _EmitClassLlvm 完成后
|
||
# 由 _create_vtable_for_class 显式创建，或在模块级 _create_Vtable_globals 调用中创建。
|
||
if ClassName in self._classes_in_progress:
|
||
continue
|
||
# 跨模块虚表过滤：_precollect_vtable_state 会将所有 includes 的有方法类同时加入
|
||
# _shared_class_vtable 和 _shared_cross_module_vtable，导致 class_vtable 与
|
||
# _cross_module_vtable_classes 内容相同，无法用以区分本模块类与跨模块类。
|
||
# _generate_structs 会为所有 class_methods 的类创建空 struct type，导致 self.structs
|
||
# 也包含所有类。过滤条件是 self.functions：只考虑本模块定义的函数（define，有函数体），
|
||
# 跳过跨模块的 declare（无函数体）。跨模块类的 declare 通过 HandlesImports 加入
|
||
# self.functions（短名如 "MemManager.alloc"），但其 is_declaration=True。
|
||
# 若只存在 declare 而无 define，说明本模块未定义该类，虚表应由定义模块创建。
|
||
# vtable linkage='internal'，跨模块调用通过对象的 vtable 指针（首字段）完成分派，
|
||
# 不依赖本模块的 vtable 全局变量。
|
||
has_local_method: bool = False
|
||
prefix: str = f"{ClassName}."
|
||
for func_name, func_obj in self.functions.items():
|
||
if func_name.startswith(prefix):
|
||
# 跳过跨模块的 declare（无函数体），只考虑本模块定义的函数
|
||
if not getattr(func_obj, 'is_declaration', False):
|
||
has_local_method = True
|
||
break
|
||
if not has_local_method:
|
||
continue
|
||
VtableType: ir.ArrayType = ir.ArrayType(ir.PointerType(ir.IntType(8)), len(methods))
|
||
Vtable: ir.GlobalVariable = ir.GlobalVariable(self.module, VtableType, name=self._mangle_name(f"{ClassName}_Vtable"))
|
||
Vtable.initializer = ir.Constant(VtableType, [ir.Constant(ir.PointerType(ir.IntType(8)), None)] * len(methods))
|
||
Vtable.linkage = 'internal'
|
||
self.Vtables[ClassName] = Vtable
|
||
|
||
def _create_vtable_for_class(self, ClassName: str) -> None:
|
||
"""为单个类创建 vtable（用于 _EmitClassLlvm 中当前类的方法已全部注册后）。"""
|
||
methods: list = self.class_methods.get(ClassName, [])
|
||
if not methods:
|
||
return
|
||
if ClassName not in self.class_vtable and ClassName not in self._cross_module_vtable_classes:
|
||
return
|
||
_vtable_name: str = self._mangle_name(f"{ClassName}_Vtable")
|
||
# 如果虚表已在导入阶段创建（方法列表不完整，缺少继承方法），删除旧虚表
|
||
if ClassName in self.Vtables:
|
||
_old_vtable = self.Vtables[ClassName]
|
||
_old_name = _old_vtable.name
|
||
if _old_name in self.module.globals:
|
||
del self.module.globals[_old_name]
|
||
# llvmlite 的 NameScope._useset 追踪所有已使用的名字，
|
||
# del module.globals[name] 不会从 _useset 移除，
|
||
# 导致再次创建同名 GlobalVariable 时 scope.register() 报 DuplicatedNameError
|
||
self.module.scope._useset.discard(_old_name)
|
||
del self.Vtables[ClassName]
|
||
# 防御性：如果全局变量已存在但不在 Vtables 字典中，也删除
|
||
if _vtable_name in self.module.globals:
|
||
del self.module.globals[_vtable_name]
|
||
self.module.scope._useset.discard(_vtable_name)
|
||
VtableType: ir.ArrayType = ir.ArrayType(ir.PointerType(ir.IntType(8)), len(methods))
|
||
Vtable: ir.GlobalVariable = ir.GlobalVariable(self.module, VtableType, name=_vtable_name)
|
||
Vtable.initializer = ir.Constant(VtableType, [ir.Constant(ir.PointerType(ir.IntType(8)), None)] * len(methods))
|
||
Vtable.linkage = 'internal'
|
||
self.Vtables[ClassName] = Vtable
|
||
|
||
def _fix_global_var_init(self) -> None:
|
||
for gv_name, gv in list(self.module.globals.items()):
|
||
if not isinstance(gv, ir.GlobalVariable):
|
||
continue
|
||
if gv.linkage in ('external', 'extern_weak'):
|
||
continue
|
||
needs_fix: bool = False
|
||
if gv.initializer is None:
|
||
needs_fix = True
|
||
elif hasattr(gv.initializer, 'constant') and isinstance(gv.initializer.constant, _Undefined):
|
||
needs_fix = True
|
||
elif isinstance(gv.initializer, ir.Constant):
|
||
if isinstance(gv.initializer.constant, list):
|
||
if any(hasattr(c, 'constant') and isinstance(c.constant, _Undefined) for c in gv.initializer.constant):
|
||
needs_fix = True
|
||
if not needs_fix:
|
||
continue
|
||
gv.initializer = ir.Constant(gv.value_type, None)
|
||
if gv_name.startswith('str_const_') or gv_name.endswith('_Vtable') or gv_name.endswith('_str'):
|
||
gv.linkage = 'internal'
|
||
|
||
def _set_Vtable_initializers(self) -> None:
|
||
for ClassName, methods in self.class_methods.items():
|
||
if ClassName not in self.Vtables:
|
||
continue
|
||
if not methods:
|
||
continue
|
||
struct_type: ir.IdentifiedStructType | None = self.structs.get(ClassName)
|
||
if struct_type is None:
|
||
continue
|
||
Vtable: ir.GlobalVariable = self.Vtables[ClassName]
|
||
Vtable_entries: list[ir.Constant] = []
|
||
for MethodName in methods:
|
||
short_name: str = MethodName.split('.')[-1] if '.' in MethodName else MethodName
|
||
full_MethodName: str = f"{ClassName}.{short_name}"
|
||
func: ir.Function | None = None
|
||
if full_MethodName in self.functions:
|
||
func = self.functions[full_MethodName]
|
||
if func is None:
|
||
parent_cls: str | None = self.class_parent.get(ClassName)
|
||
while parent_cls:
|
||
parent_full: str = f"{parent_cls}.{short_name}"
|
||
if parent_full in self.functions:
|
||
func = self.functions[parent_full]
|
||
break
|
||
parent_cls = self.class_parent.get(parent_cls)
|
||
if func is None:
|
||
Vtable_entries.append(ir.Constant(ir.PointerType(ir.IntType(8)), None))
|
||
continue
|
||
Vtable_entries.append(func.bitcast(ir.PointerType(ir.IntType(8))))
|
||
Vtable.initializer = ir.Constant(Vtable.type.pointee, Vtable_entries) |