TermiNexus
cc0615e519
- vast/Parser：语句位置识别裸 `fallthrough`（仅整条语句命中），脱糖为 c.NoBreak() 标记调用；作标识符的写法不受影响 - HandlesBody：`c.NoBreak()` 标记语句不产出 IR（语义由 HandlesMatch 消费） - HandlesMatch：新增 _HandleMatchCaseBody（case 内 break 目标 = match 的 AfterBB， 经 loop_break_targets 压栈/出栈，不影响外层循环）与 _FallThroughTarget； 9 处 fallthrough 由"只留无终结符块"改为显式 br 下一个 case body
539 lines
33 KiB
Python
539 lines
33 KiB
Python
from __future__ import annotations
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from typing import TYPE_CHECKING, Any
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if TYPE_CHECKING:
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from lib.core.translator import Translator
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from lib.core.Handles.HandlesBase import BaseHandle
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import vast as ast
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import llvmlite.ir as ir
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class MatchHandle(BaseHandle):
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@staticmethod
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def _PatternCaptureNames(Pattern: ast.AST) -> list[str]:
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"""模式中所有**捕获名**（递归 MatchOr/MatchClass/MatchSequence/MatchMapping）。
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用于判定"该 case 是否必须登记绑定"：有捕获却登记不上，case body 里的名字
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就会变成"未定义名称"，必须在**生成 body 之前**响亮失败，而不是留到取名时。
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"""
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Names: list[str] = []
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if isinstance(Pattern, ast.MatchAs):
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if Pattern.name:
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Names.append(Pattern.name)
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if Pattern.pattern is not None:
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Names.extend(MatchHandle._PatternCaptureNames(Pattern.pattern))
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elif isinstance(Pattern, ast.MatchStar):
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if Pattern.name:
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Names.append(Pattern.name)
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elif isinstance(Pattern, (ast.MatchOr, ast.MatchSequence, ast.MatchClass, ast.MatchMapping)):
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for p in (getattr(Pattern, 'patterns', None) or []):
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Names.extend(MatchHandle._PatternCaptureNames(p))
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for p in (getattr(Pattern, 'kwd_patterns', None) or []):
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Names.extend(MatchHandle._PatternCaptureNames(p))
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_rest: str | None = getattr(Pattern, 'rest', None)
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if _rest:
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Names.append(_rest)
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return Names
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def _HandleMatchLlvm(self, Node: ast.Match) -> None:
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Gen: "Translator.LlvmGen" = self.Trans.LlvmGen
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SubjectVal: ir.Value | None = self.HandleExprLlvm(Node.subject)
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if not SubjectVal:
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return
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IsRenumMatch: bool = False
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RenumName: str | None = None
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SubjectPtr: ir.Value | None = None
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if isinstance(Node.subject, ast.Name):
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VarName: str = Node.subject.id
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TypeInfo: "SymbolTable.SymbolInfo | None" = self.Trans.SymbolTable.lookup(VarName)
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if TypeInfo and TypeInfo.IsRenum:
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IsRenumMatch = True
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RenumName = TypeInfo.Name
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SubjectPtr = Gen._Load_var(VarName)
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if not IsRenumMatch:
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for case in Node.cases:
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if isinstance(case.pattern, ast.MatchClass):
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cls_node: ast.expr = case.pattern.cls
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VariantName: str | None = None
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QualifiedName: str | None = None
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if isinstance(cls_node, ast.Name):
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VariantName = cls_node.id
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elif isinstance(cls_node, ast.Attribute):
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VariantName = cls_node.attr
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# Extract enum name for qualified lookup to avoid collision
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# with same-name factory functions (e.g. def Ptr vs LLVMType.Ptr)
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if isinstance(cls_node.value, ast.Attribute):
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QualifiedName = f"{cls_node.value.attr}.{VariantName}"
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elif isinstance(cls_node.value, ast.Name):
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QualifiedName = f"{cls_node.value.id}.{VariantName}"
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if VariantName:
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# Try qualified name first (e.g., "LLVMType.Ptr") to avoid
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# collision with same-name functions (e.g., def Ptr(...))
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SymInfo: "SymbolTable.SymbolInfo" = None
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if QualifiedName:
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SymInfo = self.Trans.SymbolTable.lookup(QualifiedName)
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if not (SymInfo and SymInfo.IsEnumMember):
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SymInfo = self.Trans.SymbolTable.lookup(VariantName)
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if SymInfo and SymInfo.IsEnumMember and SymInfo.EnumName:
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EnumName: str = SymInfo.EnumName
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EnumInfo: "SymbolTable.SymbolInfo" = self.Trans.SymbolTable.lookup(EnumName)
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if EnumInfo and EnumInfo.IsRenum:
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IsRenumMatch = True
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RenumName = EnumName
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if SubjectPtr is None:
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SubjectPtr = self.HandleExprLlvm(Node.subject)
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break
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if IsRenumMatch and SubjectPtr:
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self._HandleRenumMatchLlvm(Node, RenumName, SubjectPtr)
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return
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if not isinstance(SubjectVal.type, ir.IntType):
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try:
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SubjectVal = Gen.builder.ptrtoint(SubjectVal, ir.IntType(64), name="match_subj")
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SubjectVal = Gen.builder.trunc(SubjectVal, ir.IntType(32), name="match_subj_i32")
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except Exception: # 回退：ptrtoint 失败时直接返回
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return
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SwitchIntType: ir.IntType = SubjectVal.type
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DefaultBB: ir.Block = Gen.func.append_basic_block(name="match.default")
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AfterBB: ir.Block = Gen.func.append_basic_block(name="match.end")
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CaseBBs: list[ir.Block] = []
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CaseValues: list[ir.Value] = []
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HasDefault: bool = False
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HasNoBreak: list[bool] = []
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for i, case in enumerate(Node.cases):
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pattern: ast.pattern = case.pattern
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if isinstance(pattern, ast.MatchValue):
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Val: ir.Value | None = self.HandleExprLlvm(pattern.value)
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if Val:
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CaseVal: ir.Value
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if isinstance(Val.type, ir.IntType):
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if Val.type != SwitchIntType:
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if Val.type.width > SwitchIntType.width:
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CaseVal = ir.Constant(SwitchIntType, Val.constant & ((1 << SwitchIntType.width) - 1))
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else:
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CaseVal = ir.Constant(SwitchIntType, Val.constant)
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else:
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CaseVal = Val
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else:
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try:
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CaseVal = Gen.builder.ptrtoint(Val, SwitchIntType, name=f"case_val_{i}")
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except Exception: # 回退：ptrtoint 失败时设默认值 0
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CaseVal = ir.Constant(SwitchIntType, 0)
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CaseValues.append(CaseVal)
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CaseBBs.append(Gen.func.append_basic_block(name=f"match.case_{i}"))
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elif isinstance(pattern, ast.MatchOr):
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for j, SubPattern in enumerate(pattern.patterns):
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if isinstance(SubPattern, ast.MatchValue):
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Val: ir.Value | None = self.HandleExprLlvm(SubPattern.value)
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if Val:
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CaseVal: ir.Value
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if isinstance(Val.type, ir.IntType):
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if Val.type != SwitchIntType:
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if Val.type.width > SwitchIntType.width:
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CaseVal = ir.Constant(SwitchIntType, Val.constant & ((1 << SwitchIntType.width) - 1))
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else:
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CaseVal = ir.Constant(SwitchIntType, Val.constant)
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else:
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CaseVal = Val
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else:
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try:
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CaseVal = Gen.builder.ptrtoint(Val, SwitchIntType, name=f"case_val_{i}_{j}")
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except Exception: # 回退：ptrtoint 失败时设默认值 0
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CaseVal = ir.Constant(SwitchIntType, 0)
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CaseValues.append(CaseVal)
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CaseBBs.append(Gen.func.append_basic_block(name=f"match.case_{i}_{j}"))
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elif isinstance(pattern, ast.MatchSingleton):
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if pattern.value is None:
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CaseValues.append(ir.Constant(SwitchIntType, 0))
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CaseBBs.append(Gen.func.append_basic_block(name=f"match.case_{i}"))
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elif isinstance(pattern, ast.MatchAs):
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if pattern.pattern is None:
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HasDefault = True
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CaseBBs.append(DefaultBB)
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elif isinstance(pattern, ast.MatchSequence):
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HasDefault = True
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CaseBBs.append(DefaultBB)
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elif isinstance(pattern, ast.MatchClass):
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# 兜底处理：REnum 检测失败但 case 是 MatchClass（REnum 变体模式）
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# 尝试从变体名查找 tag 值，按整数值处理
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cls_node_mc: ast.expr = pattern.cls
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VariantName_mc: str | None = None
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QualifiedName_mc: str | None = None
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if isinstance(cls_node_mc, ast.Name):
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VariantName_mc = cls_node_mc.id
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elif isinstance(cls_node_mc, ast.Attribute):
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VariantName_mc = cls_node_mc.attr
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if isinstance(cls_node_mc.value, ast.Attribute):
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QualifiedName_mc = f"{cls_node_mc.value.attr}.{VariantName_mc}"
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elif isinstance(cls_node_mc.value, ast.Name):
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QualifiedName_mc = f"{cls_node_mc.value.id}.{VariantName_mc}"
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TagValue_mc: int | None = None
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SymInfo_mc: "SymbolTable.SymbolInfo" = None
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if QualifiedName_mc:
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SymInfo_mc = self.Trans.SymbolTable.lookup(QualifiedName_mc)
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if not (SymInfo_mc and SymInfo_mc.IsEnumMember):
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SymInfo_mc = self.Trans.SymbolTable.lookup(VariantName_mc)
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if SymInfo_mc and SymInfo_mc.IsEnumMember:
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TagValue_mc = SymInfo_mc.value
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if TagValue_mc is not None:
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# 兜底分支**不登记捕获绑定**（它按整数 tag 处理，无变体载荷可 GEP）。
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# 因此只要该 case 有捕获，就必须在此 fail-fast —— 否则 case body 里的
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# 绑定名随后变成"未定义名称"（现场 VpiReader.vp:1521 pointee_cs），
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# 真因（外层 REnum 判定未成立）被掩盖。报文直接列出判据供定位。
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_caps_mc: list[str] = self._PatternCaptureNames(pattern)
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if _caps_mc:
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from lib.core.LLVMCG.FuncGen import FailFastError
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_en_mc: str | None = getattr(SymInfo_mc, 'EnumName', None)
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_sym_en: "SymbolTable.SymbolInfo" = (
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self.Trans.SymbolTable.lookup(_en_mc) if _en_mc else None)
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_sym_v: "SymbolTable.SymbolInfo" = (
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self.Trans.SymbolTable.lookup(VariantName_mc) if VariantName_mc else None)
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raise FailFastError(
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f"REnum 变体模式 '{QualifiedName_mc or VariantName_mc}' 含捕获 {_caps_mc}，"
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f"但外层 REnum 匹配判定未成立（IsRenumMatch=False）⇒ 兜底分支不登记捕获绑定，"
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f"case body 里这些名字必然成为'未定义名称'。判据："
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f"符号表['{QualifiedName_mc}'] => "
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f"IsEnumMember={getattr(SymInfo_mc, 'IsEnumMember', None)} "
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f"value={getattr(SymInfo_mc, 'value', None)} EnumName={_en_mc!r}；"
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f"符号表['{_en_mc}'] => IsRenum={getattr(_sym_en, 'IsRenum', None)} "
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f"IsStruct={getattr(_sym_en, 'IsStruct', None)} "
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f"IsEnum={getattr(_sym_en, 'IsEnum', None)}；"
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f"符号表['{VariantName_mc}'] => "
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f"IsEnumMember={getattr(_sym_v, 'IsEnumMember', None)} "
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f"EnumName={getattr(_sym_v, 'EnumName', None)!r}"
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)
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CaseValues.append(ir.Constant(SwitchIntType, TagValue_mc))
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CaseBBs.append(Gen.func.append_basic_block(name=f"match.case_{VariantName_mc}"))
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else:
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# 变体名未找到，跳过此 case（fast-fail 已在外层处理）
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pass
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def _HasNoBreak(stmts: list[ast.stmt]) -> bool:
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for stmt in stmts:
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if isinstance(stmt, ast.Expr) and isinstance(stmt.value, ast.Call):
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if isinstance(stmt.value.func, ast.Attribute):
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if (isinstance(stmt.value.func.value, ast.Name) and
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stmt.value.func.value.id == 'c' and
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stmt.value.func.attr == 'NoBreak'):
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return True
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if getattr(stmt, 'body', None) and isinstance(stmt.body, list):
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if _HasNoBreak(stmt.body):
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return True
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if getattr(stmt, 'orelse', None):
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if isinstance(stmt.orelse, list) and _HasNoBreak(stmt.orelse):
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return True
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return False
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HasNoBreak.append(_HasNoBreak(case.body) if case.body else False)
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if not HasDefault:
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CaseBBs.append(DefaultBB)
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SwitchCases: list[tuple[ir.Value, ir.Block]] = [(val, bb) for val, bb in zip(CaseValues, CaseBBs) if bb != DefaultBB]
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switch_instr: ir.SwitchInstr = Gen.builder.switch(SubjectVal, DefaultBB)
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for val, bb in SwitchCases:
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switch_instr.add_case(val, bb)
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CaseIdx: int = 0
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for i, case in enumerate(Node.cases):
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pattern: ast.pattern = case.pattern
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if isinstance(pattern, ast.MatchOr):
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NumSubCases: int = len(pattern.patterns)
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for j in range(NumSubCases):
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if CaseIdx < len(CaseBBs) and CaseBBs[CaseIdx] != DefaultBB:
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Gen.builder.position_at_start(CaseBBs[CaseIdx])
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self._HandleMatchCaseBody(Gen, case.body, AfterBB)
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if not Gen.builder.block.is_terminated:
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if not HasNoBreak[i]:
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Gen.builder.branch(AfterBB)
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else:
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Gen.builder.branch(self._FallThroughTarget(CaseBBs, CaseIdx, AfterBB))
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CaseIdx += 1
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elif isinstance(pattern, (ast.MatchValue, ast.MatchSingleton)):
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if CaseIdx < len(CaseBBs) and CaseBBs[CaseIdx] != DefaultBB:
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Gen.builder.position_at_start(CaseBBs[CaseIdx])
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self._HandleMatchCaseBody(Gen, case.body, AfterBB)
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if not Gen.builder.block.is_terminated:
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if not HasNoBreak[i]:
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Gen.builder.branch(AfterBB)
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else:
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Gen.builder.branch(self._FallThroughTarget(CaseBBs, CaseIdx, AfterBB))
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CaseIdx += 1
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elif isinstance(pattern, ast.MatchAs):
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if pattern.pattern is None:
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Gen.builder.position_at_start(DefaultBB)
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self._HandleMatchCaseBody(Gen, case.body, AfterBB)
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if not Gen.builder.block.is_terminated:
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if not HasNoBreak[i]:
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Gen.builder.branch(AfterBB)
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else:
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Gen.builder.branch(self._FallThroughTarget(CaseBBs, CaseIdx, AfterBB))
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CaseIdx += 1
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elif isinstance(pattern, ast.MatchSequence):
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Gen.builder.position_at_start(DefaultBB)
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self._HandleMatchCaseBody(Gen, case.body, AfterBB)
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if not Gen.builder.block.is_terminated:
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if not HasNoBreak[i]:
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Gen.builder.branch(AfterBB)
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else:
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Gen.builder.branch(self._FallThroughTarget(CaseBBs, CaseIdx, AfterBB))
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CaseIdx += 1
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elif isinstance(pattern, ast.MatchClass):
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# 兜底处理：MatchClass 在非 REnum 路径的 case body 生成
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# case 收集阶段已创建 CaseBB，此处生成 body
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if CaseIdx < len(CaseBBs) and CaseBBs[CaseIdx] != DefaultBB:
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Gen.builder.position_at_start(CaseBBs[CaseIdx])
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self._HandleMatchCaseBody(Gen, case.body, AfterBB)
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if not Gen.builder.block.is_terminated:
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if not HasNoBreak[i]:
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Gen.builder.branch(AfterBB)
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else:
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Gen.builder.branch(self._FallThroughTarget(CaseBBs, CaseIdx, AfterBB))
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CaseIdx += 1
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if not HasDefault:
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Gen.builder.position_at_start(DefaultBB)
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Gen.builder.branch(AfterBB)
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elif not any(isinstance(c.pattern, ast.MatchAs) and c.pattern.pattern is None for c in Node.cases) and not any(isinstance(c.pattern, ast.MatchSequence) for c in Node.cases):
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Gen.builder.position_at_start(DefaultBB)
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Gen.builder.branch(AfterBB)
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Gen.builder.position_at_start(AfterBB)
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def _HandleMatchCaseBody(self, Gen: "Translator.LlvmGen",
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Body: list[ast.stmt], AfterBB: ir.Block) -> None:
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"""翻译 match case 体：case 体内的 break 目标是 match 的 AfterBB
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C switch 语义——case 内 break 跳出 **match**（而非外层循环）。故翻译前把
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AfterBB 压入 loop_break_targets，翻译完弹出（外层循环目标不受影响）。
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"""
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Targets: list = Gen.loop_break_targets
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Targets.append(AfterBB)
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try:
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self.HandleBodyLlvm(Body)
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finally:
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Targets.pop()
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@staticmethod
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def _FallThroughTarget(CaseBBs: list[ir.Block], CaseIdx: int, AfterBB: ir.Block) -> ir.Block:
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"""fallthrough 的落点：下一个 case 的 body（无后继槽位时落到 AfterBB）
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`fallthrough`（vast 软关键字，脱糖为 c.NoBreak()）表示"本 case 不自动
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break"，直接落到下一个 case 的 body（对齐 C 的 [[fallthrough]]）。
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"""
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NextIdx: int = CaseIdx + 1
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if 0 <= NextIdx < len(CaseBBs):
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return CaseBBs[NextIdx]
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return AfterBB
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def _HandleRenumMatchLlvm(self, Node: ast.Match, RenumName: str, SubjectPtr: ir.Value) -> None:
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Gen: "Translator.LlvmGen" = self.Trans.LlvmGen
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if isinstance(SubjectPtr.type, ir.PointerType) and isinstance(SubjectPtr.type.pointee, ir.PointerType):
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SubjectPtr = Gen._load(SubjectPtr, name="Load_match_subj")
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# Bug fix: HandleExprLlvm 可能对 REnum 字段执行了 load，返回值而非指针。
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# 情况1: SubjectPtr 不是指针类型（如 IntType）→ alloca REnum 结构体 + store
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# 情况2: SubjectPtr 是指针但 pointee 不是结构体（如 i32* 指向 __tag）→ bitcast
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NeedAlloca: bool = not isinstance(SubjectPtr.type, ir.PointerType)
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NeedBitcast: bool = (isinstance(SubjectPtr.type, ir.PointerType) and
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not isinstance(SubjectPtr.type.pointee, (ir.IdentifiedStructType, ir.LiteralStructType)))
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if NeedAlloca or NeedBitcast:
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RenumStructType: Any = Gen.structs.get(RenumName)
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if RenumStructType is None:
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# 跨模块编译时 REnum 结构体可能尚未在 Gen.structs 中注册
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# （如 import llvmlite 后 LLVMType 仅在符号表，Gen.structs 无条目）。
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# 使用 _get_or_create_struct 按需创建（可能为 opaque）。
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RenumStructType = Gen._get_or_create_struct(RenumName)
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if NeedAlloca:
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AllocaPtr: ir.Value = Gen._allocaEntry(RenumStructType, name="match_subj_alloca")
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CastedPtr: ir.Value = Gen.builder.bitcast(AllocaPtr, ir.PointerType(SubjectPtr.type), name="match_subj_cast")
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Gen._store(SubjectPtr, CastedPtr)
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SubjectPtr = AllocaPtr
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else:
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SubjectPtr = Gen.builder.bitcast(SubjectPtr, ir.PointerType(RenumStructType), name="match_subj_recast")
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# REnum 布局为 { i32 __tag, <payload> }，tag 在偏移 0。
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# 使用 bitcast 到 i32* 替代 gep [0,0]，兼容 opaque 结构体
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# （跨模块编译时 REnum 结构体可能未 set_body，gep 会失败）。
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tag_ptr: ir.Value = Gen.builder.bitcast(SubjectPtr, ir.PointerType(ir.IntType(32)), name="match_tag_ptr")
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TagVal: ir.Value = Gen._load(tag_ptr, name="match_tag_val")
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DefaultBB: ir.Block = Gen.func.append_basic_block(name="match.default")
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AfterBB: ir.Block = Gen.func.append_basic_block(name="match.end")
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CaseBBs: list[ir.Block] = []
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CaseValues: list[ir.Value] = []
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CaseBindings: list[list[tuple[str, str, ir.Type, int]]] = []
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HasDefault: bool = False
|
||
HasNoBreak: list[bool] = []
|
||
for i, case in enumerate(Node.cases):
|
||
pattern: ast.pattern = case.pattern
|
||
bindings: list[tuple[str, str, ir.Type, int]] = []
|
||
if isinstance(pattern, ast.MatchClass):
|
||
cls_node: ast.expr = pattern.cls
|
||
VariantName: str | None = None
|
||
QualifiedName: str | None = None
|
||
if isinstance(cls_node, ast.Name):
|
||
VariantName = cls_node.id
|
||
elif isinstance(cls_node, ast.Attribute):
|
||
VariantName = cls_node.attr
|
||
if isinstance(cls_node.value, ast.Attribute):
|
||
QualifiedName = f"{cls_node.value.attr}.{VariantName}"
|
||
elif isinstance(cls_node.value, ast.Name):
|
||
QualifiedName = f"{cls_node.value.id}.{VariantName}"
|
||
if VariantName:
|
||
TagValue: int | None = None
|
||
SymInfo: "SymbolTable.SymbolInfo" = None
|
||
if QualifiedName:
|
||
SymInfo = self.Trans.SymbolTable.lookup(QualifiedName)
|
||
if not (SymInfo and SymInfo.IsEnumMember):
|
||
SymInfo = self.Trans.SymbolTable.lookup(VariantName)
|
||
if SymInfo and SymInfo.IsEnumMember:
|
||
TagValue = SymInfo.value
|
||
if TagValue is not None:
|
||
CaseValues.append(ir.Constant(ir.IntType(32), TagValue))
|
||
CaseBB: ir.Block = Gen.func.append_basic_block(name=f"match.case_{VariantName}")
|
||
CaseBBs.append(CaseBB)
|
||
# 变体嵌套结构体按需补发：导入模块侧 stub 只声明主 REnum，
|
||
# 不含 `<REnum>_<Variant>` 声明（见 _EnsureRenumVariantStruct）。
|
||
NestedStructName: str = self._EnsureRenumVariantStruct(Gen, RenumName, VariantName)
|
||
members: list[tuple[str, ir.Type]] = Gen.class_members.get(NestedStructName, [])
|
||
payLoad_members: list[tuple[str, ir.Type]] = [(n, t) for n, t in members if n != '__tag']
|
||
# 模式捕获必须能全部绑定：绑不上就在此 fail-fast，绝不让 case body
|
||
# 里的绑定名留到后面变成"未定义名称"（现场 VpiReader.vp:1521 pointee_cs）。
|
||
_captures: list[str] = [p.name for p in pattern.patterns
|
||
if isinstance(p, ast.MatchAs) and p.name]
|
||
if _captures and len(payLoad_members) < len(_captures):
|
||
from lib.core.LLVMCG.FuncGen import FailFastError
|
||
raise FailFastError(
|
||
f"REnum 变体模式 '{RenumName}.{VariantName}' 的载荷成员不足，"
|
||
f"无法绑定模式捕获 {_captures}："
|
||
f"class_members['{NestedStructName}']={len(members)} 项"
|
||
f"（去 __tag 后载荷 {len(payLoad_members)} 项）；"
|
||
f"structs 命中={'有' if NestedStructName in Gen.structs else '无'}；"
|
||
f"同前缀 structs 键="
|
||
f"{[k for k in Gen.structs if k.startswith(RenumName + '_')][:8]}"
|
||
)
|
||
for j, sub_pat in enumerate(pattern.patterns):
|
||
if isinstance(sub_pat, ast.MatchAs) and sub_pat.name and j < len(payLoad_members):
|
||
bindings.append((sub_pat.name, payLoad_members[j][0], payLoad_members[j][1], j))
|
||
CaseBindings.append(bindings)
|
||
else:
|
||
CaseValues.append(ir.Constant(ir.IntType(32), 0))
|
||
CaseBBs.append(Gen.func.append_basic_block(name=f"match.case_{i}"))
|
||
CaseBindings.append([])
|
||
elif isinstance(pattern, ast.MatchValue):
|
||
Val: ir.Value | None = self.HandleExprLlvm(pattern.value)
|
||
if Val:
|
||
CaseVal: ir.Value
|
||
if isinstance(Val.type, ir.IntType):
|
||
CaseVal = Val
|
||
else:
|
||
try:
|
||
CaseVal = Gen.builder.ptrtoint(Val, ir.IntType(32), name=f"case_val_{i}")
|
||
except Exception: # 回退：ptrtoint 失败时设默认值 0
|
||
CaseVal = ir.Constant(ir.IntType(32), 0)
|
||
CaseValues.append(CaseVal)
|
||
CaseBBs.append(Gen.func.append_basic_block(name=f"match.case_{i}"))
|
||
CaseBindings.append([])
|
||
elif isinstance(pattern, ast.MatchAs):
|
||
if pattern.pattern is None:
|
||
HasDefault = True
|
||
CaseBBs.append(DefaultBB)
|
||
CaseBindings.append([])
|
||
elif isinstance(pattern, ast.MatchSequence):
|
||
HasDefault = True
|
||
CaseBBs.append(DefaultBB)
|
||
CaseBindings.append([])
|
||
def _HasNoBreak(stmts: list[ast.stmt]) -> bool:
|
||
for stmt in stmts:
|
||
if isinstance(stmt, ast.Expr) and isinstance(stmt.value, ast.Call):
|
||
if isinstance(stmt.value.func, ast.Attribute):
|
||
if (isinstance(stmt.value.func.value, ast.Name) and
|
||
stmt.value.func.value.id == 'c' and
|
||
stmt.value.func.attr == 'NoBreak'):
|
||
return True
|
||
if getattr(stmt, 'body', None) and isinstance(stmt.body, list):
|
||
if _HasNoBreak(stmt.body):
|
||
return True
|
||
if getattr(stmt, 'orelse', None):
|
||
if isinstance(stmt.orelse, list) and _HasNoBreak(stmt.orelse):
|
||
return True
|
||
return False
|
||
HasNoBreak.append(_HasNoBreak(case.body) if case.body else False)
|
||
if not HasDefault:
|
||
CaseBBs.append(DefaultBB)
|
||
SwitchCases: list[tuple[ir.Value, ir.Block]] = [(val, bb) for val, bb in zip(CaseValues, CaseBBs) if bb != DefaultBB]
|
||
switch_instr: ir.SwitchInstr = Gen.builder.switch(TagVal, DefaultBB)
|
||
for val, bb in SwitchCases:
|
||
switch_instr.add_case(val, bb)
|
||
CaseIdx: int = 0
|
||
for i, case in enumerate(Node.cases):
|
||
pattern: ast.pattern = case.pattern
|
||
if isinstance(pattern, ast.MatchClass):
|
||
if CaseIdx < len(CaseBBs) and CaseBBs[CaseIdx] != DefaultBB:
|
||
Gen.builder.position_at_start(CaseBBs[CaseIdx])
|
||
bindings: list[tuple[str, str, ir.Type, int]] = CaseBindings[CaseIdx] if CaseIdx < len(CaseBindings) else []
|
||
cls_node: ast.expr = pattern.cls
|
||
VariantName: str | None = None
|
||
if isinstance(cls_node, ast.Name):
|
||
VariantName = cls_node.id
|
||
elif isinstance(cls_node, ast.Attribute):
|
||
VariantName = cls_node.attr
|
||
if VariantName:
|
||
NestedStructName: str = f"{RenumName}_{VariantName}"
|
||
if NestedStructName in Gen.structs:
|
||
NestedStructType: ir.Type = Gen.structs[NestedStructName]
|
||
# 变体 struct 可能仍是 opaque（body 未 set_body / 同名两份实例）
|
||
# ⇒ 先取已具化实例，否则 GEP 在编译期算不出元素类型（判据见
|
||
# ExprAttrHandle._ConcretePointeeFor）。
|
||
_TwV: Any = self.Trans.ExprAttrHandle._ConcretePointeeFor(
|
||
Gen, NestedStructName, NestedStructType)
|
||
if isinstance(_TwV, ir.IdentifiedStructType):
|
||
NestedStructType = _TwV
|
||
NestedStructPtrType: ir.PointerType = ir.PointerType(NestedStructType)
|
||
variant_ptr: ir.Value = Gen.builder.bitcast(SubjectPtr, NestedStructPtrType, name=f"match_cast_{VariantName}")
|
||
for bind_name, member_name, member_type, member_idx in bindings:
|
||
elem_ptr: ir.Value = Gen.builder.gep(variant_ptr, [ir.Constant(ir.IntType(32), 0), ir.Constant(ir.IntType(32), member_idx + 1)], name=f"match_{bind_name}")
|
||
# REnum 嵌套结构体共享 max_variant_struct 布局，成员类型可能与
|
||
# 结构体字段类型不一致。bitcast 到成员类型以确保后续 load 得到正确类型。
|
||
if isinstance(elem_ptr.type, ir.PointerType) and elem_ptr.type.pointee != member_type:
|
||
elem_ptr = Gen.builder.bitcast(elem_ptr, ir.PointerType(member_type), name=f"match_{bind_name}_cast")
|
||
Gen.variables[bind_name] = elem_ptr
|
||
self._HandleMatchCaseBody(Gen, case.body, AfterBB)
|
||
for bind_name, _, _, _ in bindings:
|
||
if bind_name in Gen.variables:
|
||
del Gen.variables[bind_name]
|
||
if not Gen.builder.block.is_terminated:
|
||
if not HasNoBreak[i]:
|
||
Gen.builder.branch(AfterBB)
|
||
else:
|
||
Gen.builder.branch(self._FallThroughTarget(CaseBBs, CaseIdx, AfterBB))
|
||
CaseIdx += 1
|
||
elif isinstance(pattern, ast.MatchValue):
|
||
if CaseIdx < len(CaseBBs) and CaseBBs[CaseIdx] != DefaultBB:
|
||
Gen.builder.position_at_start(CaseBBs[CaseIdx])
|
||
self._HandleMatchCaseBody(Gen, case.body, AfterBB)
|
||
if not Gen.builder.block.is_terminated:
|
||
if not HasNoBreak[i]:
|
||
Gen.builder.branch(AfterBB)
|
||
else:
|
||
Gen.builder.branch(self._FallThroughTarget(CaseBBs, CaseIdx, AfterBB))
|
||
CaseIdx += 1
|
||
elif isinstance(pattern, ast.MatchAs):
|
||
if pattern.pattern is None:
|
||
Gen.builder.position_at_start(DefaultBB)
|
||
self._HandleMatchCaseBody(Gen, case.body, AfterBB)
|
||
if not Gen.builder.block.is_terminated:
|
||
if not HasNoBreak[i]:
|
||
Gen.builder.branch(AfterBB)
|
||
else:
|
||
Gen.builder.branch(self._FallThroughTarget(CaseBBs, CaseIdx, AfterBB))
|
||
CaseIdx += 1
|
||
elif isinstance(pattern, ast.MatchSequence):
|
||
Gen.builder.position_at_start(DefaultBB)
|
||
self._HandleMatchCaseBody(Gen, case.body, AfterBB)
|
||
if not Gen.builder.block.is_terminated:
|
||
if not HasNoBreak[i]:
|
||
Gen.builder.branch(AfterBB)
|
||
else:
|
||
Gen.builder.branch(self._FallThroughTarget(CaseBBs, CaseIdx, AfterBB))
|
||
CaseIdx += 1
|
||
if not HasDefault:
|
||
Gen.builder.position_at_start(DefaultBB)
|
||
Gen.builder.branch(AfterBB)
|
||
elif not any(isinstance(c.pattern, ast.MatchAs) and c.pattern.pattern is None for c in Node.cases) and not any(isinstance(c.pattern, ast.MatchSequence) for c in Node.cases):
|
||
Gen.builder.position_at_start(DefaultBB)
|
||
Gen.builder.branch(AfterBB)
|
||
Gen.builder.position_at_start(AfterBB) |