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require ../utils/misc.fs | |
require ./ir.fs | |
( Node basic pattern maching ) | |
: (match-start) 0 ; immediate | |
: (match-end) 0 ?do postpone then loop ; immediate | |
: (match-open) | |
>r ` dup ` 0<> ` if ` dup r> 1+ | |
; immediate | |
: (match-close) | |
>r ` if r> 1+ | |
; immediate | |
: (match-true) ` drop ` true ` exit ; immediate | |
: (match-false) ` drop ` false ; immediate | |
: match<< | |
` (match-start) | |
` (match-open) | |
; immediate | |
: followed-by | |
` (match-close) | |
` next-node | |
` (match-open) | |
; immediate | |
: >> | |
` (match-close) | |
` (match-true) | |
` (match-end) | |
` (match-false) | |
; immediate | |
( Basic tail-call optimization [TCO] | |
CALL xxx , RET | |
can be transformed in BRANCH xxx | |
) | |
: call? ir-node-type @ IR_NODE_CALL = ; | |
: ret? ir-node-type @ IR_NODE_RET = ; | |
: tail-call? ( ir-node -- true|false ) | |
match<< call? followed-by ret? >> ; | |
: optimize-tail-call ( ir -- ir ) | |
dup ir-entry | |
begin ?dup while | |
dup tail-call? if | |
dup next-node delete-node | |
IR_NODE_BRANCH ::type | |
over ir-node-value @ ::value | |
then | |
next-node | |
repeat ; | |
: optimize-ir | |
optimize-tail-call ; |