static ir_expr_t un_ex(tr_expr_t expr)
{
switch (expr->kind)
{
case TR_EX:
return expr->u.ex;
case TR_NX:
return ir_eseq_expr(expr->u.nx, ir_const_expr(0));
case TR_CX: {
temp_t tmp = temp();
tmp_label_t t = tmp_label();
tmp_label_t f = tmp_label();
fill_patch(expr->u.cx.trues, t);
fill_patch(expr->u.cx.falses, f);
return ir_eseq_expr(
ir_seq_stmt(vlist(
5,
ir_move_stmt(ir_tmp_expr(tmp),
ir_const_expr(1)),
expr->u.cx.stmt,
ir_label_stmt(f),
ir_move_stmt(ir_tmp_expr(tmp),
ir_const_expr(0)),
ir_label_stmt(t))),
ir_tmp_expr(tmp));
}
}
assert(0);
return NULL;
}
tr_expr_t tr_if_expr(tr_expr_t cond, tr_expr_t then, tr_expr_t else_)
{
tmp_label_t t = tmp_label();
tmp_label_t f = tmp_label();
tmp_label_t done = tmp_label();
cx_t cx = un_cx(cond);
ir_expr_t result = ir_tmp_expr(temp());
fill_patch(cx.trues, t);
fill_patch(cx.falses, f);
if (else_)
{
return tr_ex(ir_eseq_expr(ir_seq_stmt(vlist(
7,
cx.stmt,
ir_label_stmt(t),
ir_move_stmt(ir_mem_expr(result), un_ex(then)),
ir_jump_stmt(ir_name_expr(done), list(done, NULL)),
ir_label_stmt(f),
ir_move_stmt(ir_mem_expr(result), un_ex(else_)),
ir_label_stmt(done))),
result));
}
else
{
return tr_nx(ir_seq_stmt(vlist(
4,
cx.stmt,
ir_label_stmt(t),
un_nx(then),
ir_label_stmt(f))));
}
return NULL;
}
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));
}
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_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
}
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))));
}
