补充
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138
lib/core/Handles/HandlesWith.py
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138
lib/core/Handles/HandlesWith.py
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from __future__ import annotations
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from typing import TYPE_CHECKING
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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 ast
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import llvmlite.ir as ir
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class WithHandle(BaseHandle):
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def _HandleWithLlvm(self, Node):
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Gen = self.Trans.LlvmGen
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for item in Node.items:
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context_expr = item.context_expr
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asname = None
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target = getattr(item, 'optional_vars', getattr(item, 'target', getattr(item, 'asname', None)))
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if target and isinstance(target, ast.Name):
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asname = target.id
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ClassName = None
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if isinstance(context_expr, ast.Call):
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if isinstance(context_expr.func, ast.Name):
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ClassName = context_expr.func.id
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elif isinstance(context_expr.func, ast.Attribute):
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ClassName = context_expr.func.attr
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if ClassName and ClassName not in Gen.structs:
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if ClassName in self.Trans.SymbolTable:
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SymInfo = self.Trans.SymbolTable[ClassName]
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if getattr(SymInfo, 'IsStruct', False) or getattr(SymInfo, 'IsRenum', False):
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pass
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else:
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ClassName = None
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else:
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ClassName = None
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elif isinstance(context_expr, ast.Name):
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VarName = context_expr.id
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if VarName in Gen.var_struct_class:
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ClassName = Gen.var_struct_class[VarName]
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ctx_val = self.HandleExprLlvm(context_expr)
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if not ctx_val:
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continue
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original_ctx_val = ctx_val
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if ClassName and isinstance(ctx_val.type, ir.PointerType):
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pointee = ctx_val.type.pointee
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if isinstance(pointee, (ir.LiteralStructType, ir.IdentifiedStructType)):
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found = Gen.find_struct_by_pointee(pointee)
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if found:
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CN, ST = found
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ClassName = CN
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StructPtrType = ir.PointerType(Gen.structs[ClassName]) if ClassName and ClassName in Gen.structs else None
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if StructPtrType and isinstance(ctx_val.type, ir.PointerType) and ctx_val.type.pointee != Gen.structs.get(ClassName):
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ctx_val = Gen.builder.bitcast(ctx_val, StructPtrType, name="cast_with_ctx")
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ctx_alloca = Gen._alloca_entry(ctx_val.type, name="__with_ctx")
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Gen._store(ctx_val, ctx_alloca)
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Gen._unregister_temp_ptr(ctx_val)
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if ClassName:
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Gen.var_struct_class['__with_ctx'] = ClassName
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Gen._var_to_heap_ptr['__with_ctx'] = ctx_val
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original_asname_heap_ptr = Gen._var_to_heap_ptr.get(asname) if asname else None
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ctx_is_var_ref = isinstance(context_expr, ast.Name)
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enter_result = None
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if ClassName:
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EnterFuncName = f'{ClassName}.__enter__'
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if EnterFuncName in Gen.functions:
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ctx_loaded = Gen._load(ctx_alloca, name="__with_ctx")
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enter_call = Gen.builder.call(Gen.functions[EnterFuncName], [ctx_loaded], name="call_enter")
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enter_result = enter_call
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if isinstance(enter_call.type, ir.PointerType):
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pointee = enter_call.type.pointee
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if isinstance(pointee, ir.PointerType) and isinstance(pointee.pointee, (ir.LiteralStructType, ir.IdentifiedStructType)):
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enter_result = Gen._load(enter_call, name="enter_deref")
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elif self._is_char_pointer(enter_call) and StructPtrType:
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enter_result = Gen.builder.bitcast(enter_call, StructPtrType, name="cast_enter")
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if asname and enter_result:
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if isinstance(enter_result.type, ir.PointerType) and isinstance(enter_result.type.pointee, (ir.LiteralStructType, ir.IdentifiedStructType)):
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found = Gen.find_struct_by_pointee(enter_result.type.pointee)
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if found:
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CN, ST = found
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Gen.var_struct_class[asname] = CN
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Gen._var_to_heap_ptr[asname] = enter_result
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Gen._register_local_heap_ptr(enter_result, VarName=asname)
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if asname in Gen._reg_values:
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OldVal = Gen._reg_values[asname]
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var = Gen._alloca_entry(OldVal.type, name=asname)
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Gen._store(OldVal, var)
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Gen.variables[asname] = var
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del Gen._reg_values[asname]
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if asname in Gen.variables and Gen.variables[asname] is not None:
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VarPtr = Gen.variables[asname]
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if VarPtr.type.pointee == enter_result.type:
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Gen._store(enter_result, VarPtr)
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elif isinstance(VarPtr.type.pointee, ir.PointerType) and isinstance(enter_result.type, ir.PointerType):
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CastedVal = Gen.builder.bitcast(enter_result, VarPtr.type.pointee, name=f"cast_{asname}")
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Gen._store(CastedVal, VarPtr)
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else:
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NewVar = Gen._alloca(enter_result.type, name=asname)
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Gen._store(enter_result, NewVar)
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Gen.variables[asname] = NewVar
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else:
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Gen._reg_values[asname] = enter_result
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Gen.variables[asname] = None
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self.Trans.VarScopes.append({})
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if asname:
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self.Trans.VarScopes[-1][asname] = True
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self.HandleBodyLlvm(Node.body)
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if self.Trans.VarScopes:
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self.Trans.VarScopes.pop()
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if ClassName:
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ExitFuncName = f'{ClassName}.__exit__'
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if ExitFuncName in Gen.functions:
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ctx_loaded = Gen._load(ctx_alloca, name="__with_ctx")
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Gen.builder.call(Gen.functions[ExitFuncName], [ctx_loaded], name="call_exit")
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Gen._unregister_local_heap_ptr(original_ctx_val)
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if ctx_val is not original_ctx_val:
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Gen._unregister_local_heap_ptr(ctx_val)
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if ctx_is_var_ref and original_asname_heap_ptr and original_asname_heap_ptr is not original_ctx_val and original_asname_heap_ptr is not ctx_val:
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Gen._unregister_local_heap_ptr(original_asname_heap_ptr)
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if '__with_ctx' in Gen._var_to_heap_ptr:
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del Gen._var_to_heap_ptr['__with_ctx']
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if asname and enter_result is not None and isinstance(ctx_val.type, ir.PointerType) and isinstance(enter_result.type, ir.PointerType):
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ctx_int = Gen.builder.ptrtoint(ctx_val, ir.IntType(64), name="ctx_int")
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enter_int = Gen.builder.ptrtoint(enter_result, ir.IntType(64), name="enter_int")
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same_ptr = Gen.builder.icmp_unsigned('==', ctx_int, enter_int, name="same_ptr_check")
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with_free_bb = Gen.func.append_basic_block("with_free_ctx")
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with_skip_bb = Gen.func.append_basic_block("with_skip_free")
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Gen.builder.cbranch(same_ptr, with_skip_bb, with_free_bb)
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Gen.builder.position_at_start(with_free_bb)
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raw = Gen.builder.bitcast(ctx_val, ir.PointerType(ir.IntType(8)), name="with_free_cast")
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free_func = Gen.get_or_declare_c_func('free', ir.FunctionType(ir.VoidType(), [ir.PointerType(ir.IntType(8))]))
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Gen.builder.call(free_func, [raw])
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Gen.builder.branch(with_skip_bb)
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Gen.builder.position_at_start(with_skip_bb)
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Gen._unregister_local_heap_ptr(enter_result)
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Gen._unregister_local_heap_ptr(original_ctx_val)
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elif isinstance(ctx_val.type, ir.PointerType):
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raw = Gen.builder.bitcast(ctx_val, ir.PointerType(ir.IntType(8)), name="with_free_cast")
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free_func = Gen.get_or_declare_c_func('free', ir.FunctionType(ir.VoidType(), [ir.PointerType(ir.IntType(8))]))
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Gen.builder.call(free_func, [raw])
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Gen._unregister_local_heap_ptr(original_ctx_val)
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