// Return the destination register of one instruction
xed_reg_enum_t DestRegister(xed_decoded_inst_t &xedd)
{
const xed_inst_t* inst = xed_decoded_inst_inst(&xedd);
unsigned int operandNum = xed_inst_noperands(inst); // get the number of the operands
// if the instruction has no operands, return invalid
if(operandNum == 0)
return XED_REG_INVALID;
const xed_operand_t* operand = xed_inst_operand(inst, 0); //the first operand is the destination.
xed_operand_enum_t oper_type = xed_operand_name(operand);
xed_uint_t mark = xed_operand_is_register(oper_type);
// check whether the operand is a register operand
if(mark == 1)
{
xed_reg_enum_t reg = xed_decoded_inst_get_reg(&xedd, oper_type);
ASSERT(reg != XED_REG_INVALID);
return reg;
}
return XED_REG_INVALID;
}
static void add_write_operands(xed_dot_graph_supp_t* gg,
xed_decoded_inst_t* xedd,
xed_dot_node_t* n)
{
xed_uint_t i, noperands;
xed_reg_enum_t r, r_enclosing;
const xed_inst_t* xi = 0;
xi = xed_decoded_inst_inst(xedd);
noperands = xed_inst_noperands(xi);
for( i=0; i < noperands ; i++) {
const xed_operand_t* op = xed_inst_operand(xi,i);
xed_operand_enum_t opname = xed_operand_name(op);
if (xed_operand_is_register(opname) ||
xed_operand_is_memory_addressing_register(opname)) {
if (xed_operand_written(op)) {
/* set n as the source of the value. */
/* ignoring partial writes */
r = xed_decoded_inst_get_reg(xedd, opname);
r_enclosing = xed_get_largest_enclosing_register(r);
gg->xed_reg_to_node[r_enclosing] = n;
}
}
} /* for */
}
static void add_read_operands(xed_dot_graph_supp_t* gg,
xed_decoded_inst_t* xedd,
xed_dot_node_t* n)
{
xed_uint_t i, noperands;
xed_reg_enum_t r;
const xed_inst_t* xi = 0;
xed_bool_t found = 0;
xi = xed_decoded_inst_inst(xedd);
noperands = xed_inst_noperands(xi);
for( i=0; i < noperands ; i++) {
int memop = -1;
const xed_operand_t* op = xed_inst_operand(xi,i);
xed_operand_enum_t opname = xed_operand_name(op);
if (xed_operand_is_register(opname) ||
xed_operand_is_memory_addressing_register(opname)) {
if (xed_operand_read(op)) {
/* add edge to n */
r = xed_decoded_inst_get_reg(xedd, opname);
found |= add_edge(gg, n, r);
}
continue;
}
if (opname == XED_OPERAND_MEM0)
memop = 0;
else if (opname == XED_OPERAND_MEM1 )
memop = 1;
if (memop != -1) {
/* get reads of base/index regs, if any */
xed_reg_enum_t base, indx;
base = xed_decoded_inst_get_base_reg(xedd,memop);
indx = xed_decoded_inst_get_index_reg(xedd,memop);
if (base != XED_REG_INVALID)
found |= add_edge(gg, n, base);
indx = xed_decoded_inst_get_index_reg(xedd,memop);
if (indx != XED_REG_INVALID)
found |= add_edge(gg, n, indx);
}
} /* for */
if (!found) {
/* add an edge from start */
xed_dot_edge(gg->g, gg->start, n);
}
}
void print_operands(xed_decoded_inst_t* xedd) {
unsigned int i = 0;
xed_inst_t const* const xi = xed_decoded_inst_inst(xedd);
const unsigned int noperands = xed_inst_noperands(xi);
for( i=0; i < noperands ; i++) {
xed_operand_t const* op = xed_inst_operand(xi,i);
xed_operand_enum_t op_name = xed_operand_name(op);
if (xed_operand_is_register(op_name)) {
xed_reg_enum_t reg = xed_decoded_inst_get_reg(xedd,op_name);
xed_operand_action_enum_t rw = xed_operand_rw(op);
printf("%2d: %5s %5s\n",
i,
xed_reg_enum_t2str(reg),
xed_operand_action_enum_t2str(rw));
}
}
}
