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The Structure of I-Code
The Structure of I-Code
The 'I' in I-Code stands for Intermediate. Intermediate code is code that is a step between interpreted source statements and fully compiled machine code. Typically, intermediate code uses tokens to represent the instructions to be executed. Basic09 I-Code goes a step further by re-arranging the source code instructions in post-fix notation (also known as Reverse Polish Notation) order.
The tokens used by Basic09 are a single byte ranging from $00 to $FF. The table below defines the tokens.
| 00 | 01 | READ | 02 | WRITE | 03 | UPDATE | 04 | DATA | 05 | STOP | 06 | BYE | 07 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 08 | 09 | 0A | DEG | 0B | RAD | 0C | RETURN | 0D | LET | 0E | 0F | POKE | |||
| 10 | IF | 11 | ELSE | 12 | ENDIF | 13 | FOR | 14 | NEXT | 15 | WHILE | 16 | ENDWHILE | 17 | REPEAT |
| 18 | UNTIL | 19 | LOOP | 1A | ENDLOOP | 1B | EXITIF | 1C | ENDEXIT | 1D | ON | 1E | ERROR | 1F | GOTO |
| 20 | GOTO | 21 | GOSUB | 22 | GOSUB | 23 | RUN | 24 | KILL | 25 | INPUT | 26 | 27 | CHD | |
| 28 | CHX | 29 | CREATE | 2A | OPEN | 2B | SEEK | 2C | READ | 2D | WRITE | 2E | GET | 2F | PUT |
| 30 | CLOSE | 31 | RESTORE | 32 | DELETE | 33 | CHAIN | 34 | SHELL | 35 | BASE 0 | 36 | BASE 1 | 37 | REM |
| 38 | (* | 39 | END | 3A | 3B | igt2 | 3C | 3D | 3E | \ | 3F | eol | |||
| 40 | 41 | 42 | 43 | 44 | 45 | THEN | 46 | TO | 47 | STEP | |||||
| 48 | DO | 49 | USING | 4A | : | 4B | , | 4C | 4D | ( | 4E | ) | 4F | ||
| 50 | 51 | ; | 52 | := | 53 | = | 54 | # | 55 | igt1 | 56 | 57 | |||
| 58 | 59 | 5A | 5B | 5C | 5D | 5E | 5F | ||||||||
| 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | ||||||||
| 68 | 69 | 6A | 6B | 6C | 6D | 6E | 6F | ||||||||
| 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | ||||||||
| 78 | 79 | 7A | 7B | 7C | 7D | 7E | 7F | ||||||||
| 80 | BYTE | 81 | INTEGER | 82 | REAL | 83 | BOOLEAN | 84 | STRING | 85 | udv | 86 | 1dim | 87 | 2dim |
| 88 | 3dim | 89 | udtv | 8A | 8B | 8C | 8D | bc | 8E | ic | 8F | rc | |||
| 90 | " | 91 | $ | 92 | ADDR() | 93 | 94 | SIZE() | 95 | SIZE() | 96 | POS() | 97 | ERR | |
| 98 | MOD(,) | 99 | MOD(,) | 9A | RND() | 9B | PI | 9C | SUBSTR(,) | 9D | SGN() | 9E | SGN() | 9F | SIN() |
| A0 | COS() | A1 | TAN() | A2 | ASN() | A3 | ACS() | A4 | ATN() | A5 | EXP() | A6 | ABS() | A7 | ABS() |
| A8 | LOG() | A9 | LOG10() | AA | SQRT() | AB | AC | INT() | AD | INT() | AE | FIX() | AF | FIX() | |
| B0 | FLOAT() | B1 | FLOAT() | B2 | SQ() | B3 | SQ() | B4 | PEEK() | B5 | LNOT() | B6 | VAL() | B7 | LEN() |
| B8 | ASC() | B9 | LAND(,) | BA | LOR(,) | BB | LXOR(,) | BC | TRUE | BD | FALSE | BE | EOF() | BF | TRIM$() |
| C0 | MID$(,,) | C1 | LEFT$(,) | C2 | RIGHT$(,) | C3 | CHR$() | C4 | STR$() | C5 | STR$() | C6 | DATE$ | C7 | TAB |
| C8 | ritc | C9 | CA | CB | irtc | CC | CD | NOT() | CE | CF | |||||
| D0 | AND | D1 | OR | D2 | XOR | D3 | > | D4 | > | D5 | > | D6 | < | D7 | < |
| D8 | < | D9 | <> | DA | <> | DB | <> | DC | <> | DD | = | DE | = | DF | = |
| E0 | = | E1 | >= | E2 | >= | E3 | >= | E4 | <= | E5 | <= | E6 | <= | E7 | + |
| E8 | + | E9 | + | EA | - | EB | - | EC | * | ED | * | EE | / | EF | / |
| F0 | ^ | F1 | ** | F2 | avt | F3 | 1dim | F4 | 2dim | F5 | 3dim | F6 | udtv | F7 | UPDATE |
| F8 | EXEC | F9 | DIR | FA | FB | FC | FD | FE | FF | " | |||||
| 00 | 01 | PARAM | 02 | TYPE | 03 | DIM | 04 | READ+EXEC | 05 | WRITE+EXEC | 06 | UPDATE+EXEC | |||
| 3D | PROCEDURE | 81 | READ+DIR | 82 | WRITE+DIR | 83 | UPDATE+DIR |