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 basevar_variable_to_ast_lval(basevar: "X.XVariable",
offset: "VMemoryOffset",
astree: AbstractSyntaxTree) -> AST.ASTLval:
if offset.is_constant_value_offset:
offsetvalue = offset.offsetvalue()
baselval = xvariable_to_ast_lval(basevar, astree)
basetype = baselval.ctype
if basetype is not None:
if basetype.is_array:
elttype = cast("BCTypArray", basetype).tgttyp
eltsize = elttype.byte_size()
index = offsetvalue // eltsize
indexoffset = astree.mk_scalar_index_offset(index)
return astree.mk_lval(baselval.lhost, indexoffset)
elif basetype.is_pointer:
tgttype = cast("BCTypPtr", basetype).tgttyp
basexpr = astree.mk_lval_expr(baselval)
if tgttype.is_scalar:
tgtsize = tgttype.byte_size()
index = offsetvalue // tgtsize
indexoffset = astree.mk_scalar_index_offset(index)
return astree.mk_lval(baselval.lhost, indexoffset)
elif tgttype.is_struct:
compinfo = cast("BCTypComp", tgttype).compinfo
fieldoffset = field_at_offset(compinfo, offsetvalue,
astree)
return astree.mk_memref_lval(basexpr, fieldoffset)
elif tgttype.is_void:
index = offsetvalue
indexoffset = astree.mk_scalar_index_offset(index)
return astree.mk_lval(baselval.lhost, indexoffset)
elif offsetvalue == 0:
return astree.mk_memref_lval(basexpr)
else:
print(" -> Basevar with basetype")
else:
index = offsetvalue
indexoffset = astree.mk_scalar_index_offset(index)
return astree.mk_lval(baselval.lhost, indexoffset)
print("Basevar_variable: " + str(basevar) + "; offset: " + str(offset))
return astree.mk_variable_lval(str(basevar) + str(offset))
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, [], [])
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)