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 ast(self,
astree: AbstractSyntaxTree,
iaddr: str,
bytestring: str,
xdata: InstrXData) -> List[ASTInstruction]:
lhs = xdata.vars[0]
rhs1 = str(xdata.xprs[0])
rhs2 = xdata.xprs[1]
rhs3 = xdata.xprs[3]
if lhs == "SP" and rhs1 == "SP" and rhs2.is_constant:
return []
lhsast = XU.xvariable_to_ast_lval(lhs, astree)
if rhs1 == "SP" and rhs3.is_stack_address:
rhs3 = cast("XprCompound", rhs3)
stackoffset = rhs3.stack_address_offset()
rhslval = astree.mk_stack_variable_lval(stackoffset)
rhsast: ASTExpr = astree.mk_address_of(rhslval)
elif rhs1 == "PC" or str(rhs2) == "PC":
if rhs3.is_int_constant:
rhsval = cast("XprConstant", rhs3).intvalue
rhsast = astree.mk_integer_constant(rhsval)
else:
rhsast = XU.xxpr_to_ast_expr(rhs3, astree)
else:
rhsast = XU.xxpr_to_ast_expr(rhs3, astree)
result = astree.mk_assign(lhsast, rhsast)
astree.add_instruction_span(result.id, iaddr, bytestring)
return [result]
def xconstant_to_ast_expr(xc: X.XprConstant,
astree: AbstractSyntaxTree) -> AST.ASTExpr:
"""Convert a constant value to an AST Expr node."""
if xc.is_int_constant:
return astree.mk_integer_constant(xc.intvalue)
else:
raise UF.CHBError("AST conversion of xconstant " + str(xc) +
" not yet supported")
def ast_rvalue(self, astree: AbstractSyntaxTree) -> AST.ASTExpr:
return astree.mk_integer_constant(self.immediate)
def ast_rvalue(
self, astree: AbstractSyntaxTree
) -> Tuple[AST.ASTExpr, List[AST.ASTInstruction],
List[AST.ASTInstruction]]:
return (astree.mk_integer_constant(self.value), [], [])