tr_expr_t tr_field_var(tr_expr_t record, int index)
{
return tr_ex(ir_mem_expr(ir_binop_expr(
IR_PLUS,
un_ex(record),
ir_binop_expr(IR_MUL,
ir_const_expr(index),
ir_const_expr(FR_WORD_SIZE)))));
}
tr_expr_t tr_record_expr(list_t fields, int size)
{
ir_expr_t addr = ir_tmp_expr(temp());
ir_expr_t alloc = fr_external_call(
"_Alloc", list(ir_const_expr(size * FR_WORD_SIZE), NULL));
list_t p, q = NULL, r = NULL;
int i;
for (p = fields, i = 0; p; p = p->next, i++)
{
tr_expr_t field = p->data;
ir_expr_t offset = ir_binop_expr(IR_PLUS, addr,
ir_const_expr(FR_WORD_SIZE * i));
ir_stmt_t stmt = ir_move_stmt(ir_mem_expr(offset), un_ex(field));
list_t next = list(stmt, NULL);
if (q)
{
r->next = next;
r = next;
}
else
q = r = next;
}
return tr_ex(
ir_eseq_expr(
ir_seq_stmt(list(ir_move_stmt(addr, alloc), q)),
addr));
}
tr_expr_t tr_simple_var(tr_access_t access, tr_level_t level)
{
ir_expr_t fp = ir_tmp_expr(fr_fp());
return tr_ex(fr_expr(access->access, fp));
#if 0
while (level != access->level)
{
fr_access_t fr_access = tr_static_link(level)->access;
fp = ir_mem_expr(ir_binop_expr(
IR_PLUS, fp,
ir_const_expr(fr_offset(fr_access))));
level = level->parent;
}
return tr_ex(ir_mem_expr(ir_binop_expr(
IR_PLUS, fp,
ir_const_expr(fr_offset(access->access)))));
#endif
}
ir_expr_t fr_expr(fr_access_t access, ir_expr_t frame_ptr)
{
switch (access->kind)
{
case FR_IN_FRAME:
return ir_mem_expr(ir_binop_expr(
IR_PLUS,
ir_const_expr(access->u.offset),
frame_ptr));
case FR_IN_REG:
return ir_tmp_expr(access->u.reg);
default:
assert(0);
}
}
tr_expr_t tr_for_expr(tr_access_t access,
tr_expr_t low,
tr_expr_t high,
tr_expr_t body)
{
ir_expr_t var = fr_expr(access->access, ir_tmp_expr(fr_fp()));
tmp_label_t start = tmp_label();
tmp_label_t loop = tmp_label();
tmp_label_t done = tmp_label();
ir_stmt_t cond = ir_cjump_stmt(IR_LE, var, un_ex(high), loop, done);
return tr_nx(ir_seq_stmt(vlist(
7,
ir_move_stmt(var, un_ex(low)),
ir_label_stmt(start),
cond,
ir_label_stmt(loop),
un_nx(body),
ir_move_stmt(var, ir_binop_expr(IR_PLUS, var, ir_const_expr(1))),
ir_label_stmt(done))));
}
tr_expr_t tr_op_expr(int op, tr_expr_t left, tr_expr_t right)
{
ir_expr_t l = un_ex(left);
ir_expr_t r = un_ex(right);
return tr_ex(ir_binop_expr(op, l, r));
}