def assembly_ast(self, astree: AbstractSyntaxTree, iaddr: str, bytestring: str, xdata: InstrXData) -> List[AST.ASTInstruction]: regsop = self.operands[1] if not regsop.is_register_list: raise UF.CHBError("Argument to push is not a register list") (splval, _, _) = self.operands[0].ast_lvalue(astree) (sprval, _, _) = self.operands[0].ast_rvalue(astree) instrs: List[AST.ASTInstruction] = [] registers = regsop.registers sp_decr = 4 * len(registers) sp_offset = sp_decr for r in registers: sp_offset_c = astree.mk_integer_constant(sp_offset) addr = astree.mk_binary_op("minus", sprval, sp_offset_c) lhs = astree.mk_memref_lval(addr) rhs = astree.mk_register_variable_expr(r) instrs.append(astree.mk_assign(lhs, rhs)) sp_offset -= 4 sp_decr_c = astree.mk_integer_constant(sp_decr) sp_rhs = astree.mk_binary_op("minus", sprval, sp_decr_c) instrs.append(astree.mk_assign(splval, sp_rhs)) astree.add_instruction_span(instrs[0].id, iaddr, bytestring) return instrs
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 assembly_ast(self, astree: AbstractSyntaxTree, iaddr: str, bytestring: str, xdata: InstrXData) -> List[AST.ASTInstruction]: (rhs1, preinstrs1, postinstrs1) = self.operands[1].ast_rvalue(astree) (rhs2, preinstrs2, postinstrs2) = self.operands[2].ast_rvalue(astree) (lhs, _, _) = self.operands[0].ast_lvalue(astree) binop = astree.mk_binary_op("band", rhs1, rhs2) assign = astree.mk_assign(lhs, binop) astree.add_instruction_span(assign.id, iaddr, bytestring) return preinstrs1 + preinstrs2 + [assign] + postinstrs1 + postinstrs2
def assembly_ast(self, astree: AbstractSyntaxTree, iaddr: str, bytestring: str, xdata: InstrXData) -> List[ASTInstruction]: (lhs, _, _) = self.operands[0].ast_lvalue(astree) (op1, _, _) = self.operands[1].ast_rvalue(astree) (op2, _, _) = self.operands[2].ast_rvalue(astree) binop = astree.mk_binary_op("minus", op1, op2) result = astree.mk_assign(lhs, binop) astree.add_instruction_span(result.id, iaddr, bytestring) return [result]
def xtyped_expr_to_ast_expr(op: str, op1: AST.ASTExpr, op2: AST.ASTExpr, astree: AbstractSyntaxTree) -> AST.ASTExpr: """Determine if expression needs different representation based on type.""" if op1.ctype is None: raise UF.CHBError("Expression is not typed: " + str(op1)) if op1.ctype.is_pointer and op2.is_integer_constant: op2 = cast(AST.ASTIntegerConstant, op2) tgttype = cast("BCTypPtr", op1.ctype).tgttyp if tgttype.is_struct: compinfo = cast("BCTypComp", tgttype).compinfo fieldoffset = field_at_offset(compinfo, op2.cvalue, astree) lval = astree.mk_memref_lval(op1, fieldoffset) return astree.mk_address_of(lval) return astree.mk_binary_op(op, op1, op2)
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, [], [])