def xcompound_to_ast_expr(xc: X.XprCompound,
astree: AbstractSyntaxTree) -> AST.ASTExpr:
"""Convert a compound expression to an AST Expr node."""
op = xc.operator
operands = xc.operands
if len(operands) == 1:
op1 = xxpr_to_ast_expr(operands[0], astree)
return astree.mk_unary_op(op, op1)
elif len(operands) == 2:
if xc.is_stack_address:
stackoffset = xc.stack_address_offset()
rhslval = astree.mk_stack_variable_lval(stackoffset)
return astree.mk_address_of(rhslval)
else:
op1 = xxpr_to_ast_expr(operands[0], astree)
op2 = xxpr_to_ast_expr(operands[1], astree)
if op1.ctype is not None and op in ["plus", "minus"]:
return xtyped_expr_to_ast_expr(op, op1, op2, astree)
else:
return astree.mk_binary_op(op, op1, op2)
else:
raise UF.CHBError("AST conversion of compound expression " + str(xc) +
" not yet supported")
def ast_lvalue(
self, astree: AbstractSyntaxTree
) -> Tuple[AST.ASTLval, List[AST.ASTInstruction],
List[AST.ASTInstruction]]:
offset = self.memory_offset.ast_rvalue(astree)
if not self.is_add:
offset = astree.mk_unary_op("minus", offset)
xreg = astree.mk_register_variable_expr(self.register)
xindex = astree.mk_binary_op("plus", xreg, offset)
if self.is_write_back:
reglv = astree.mk_variable_lval(self.register)
assign = astree.mk_assign(reglv, xindex)
if self.is_index:
memexp = astree.mk_memref_lval(xindex)
return (memexp, [], [assign])
else:
memexp = astree.mk_memref_lval(xreg)
return (memexp, [], [assign])
else:
memexp = astree.mk_memref_lval(xindex)
return (memexp, [], [])