mu - Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

	Commit message (Expand)	Author	Age	Files	Lines
*	.	Kartik K. Agaram	2021-07-16	1	-108/+116
*	html: better highlighting for int registers	Kartik Agaram	2021-06-26	1	-43/+42
*	.	Kartik Agaram	2021-06-26	1	-6/+6
*	.	Kartik Agaram	2021-06-24	1	-3/+3
*	.	Kartik Agaram	2021-06-23	1	-64/+65
*	.	Kartik Agaram	2021-06-15	1	-106/+111
*	.	Kartik Agaram	2021-05-31	1	-67/+74
*	.	Kartik Agaram	2021-05-18	1	-99/+101
*	.	Kartik Agaram	2021-05-01	1	-92/+93
*	.	Kartik Agaram	2021-04-22	1	-65/+69
*	.	Kartik Agaram	2021-04-21	1	-69/+74
*	.	Kartik Agaram	2021-04-13	1	-4/+4
*	.	Kartik Agaram	2021-03-23	1	-74/+77
*	.	Kartik Agaram	2021-03-23	1	-197/+88
*	7476	Kartik Agaram	2020-12-30	1	-1/+1
*	7335	Kartik Agaram	2020-12-04	1	-93/+99
*	7311	Kartik Agaram	2020-12-01	1	-2/+2
*	7306	Kartik Agaram	2020-11-29	1	-2/+4
*	7249	Kartik Agaram	2020-11-15	1	-56/+56
*	7227	Kartik Agaram	2020-11-11	1	-2/+4
*	7162	Kartik Agaram	2020-11-02	1	-44/+48
*	6958	Kartik Agaram	2020-10-05	1	-135/+148
*	6774	Kartik Agaram	2020-09-11	1	-8/+10
*	6746	Kartik Agaram	2020-09-07	1	-112/+115
*	6724	Kartik Agaram	2020-08-22	1	-18/+19
*	6716	Kartik Agaram	2020-08-15	1	-16/+16
*	6693	Kartik Agaram	2020-07-31	1	-0/+3
*	6685	Kartik Agaram	2020-07-29	1	-13/+13
*	6673	Kartik Agaram	2020-07-25	1	-15/+15
*	6632	Kartik Agaram	2020-07-11	1	-3/+3
*	6631	Kartik Agaram	2020-07-11	1	-0/+218

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<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Mu - 112read-byte.subx</title> <meta name="Generator" content="Vim/8.2"> <meta name="plugin-version" content="vim8.1_v2"> <meta name="syntax" content="none"> <meta name="settings" content="number_lines,use_css,no_foldcolumn,expand_tabs,line_ids,prevent_copy=,use_input_for_pc=fallback"> <meta name="colorscheme" content="minimal-light"> <style>  </style> <script>  </script> </head> <body onload='JumpToLine();'> <a href='https://github.com/akkartik/mu/blob/main/112read-byte.subx'>https://github.com/akkartik/mu/blob/main/112read-byte.subx</a> <pre id='vimCodeElement'> 1 # Read a single byte from a stream. 2 # 3 # We need to do this in machine code because streams need to be opaque types, 4 # and we don't yet support opaque types in Mu. 5 6 == code 7 # instruction effective address register displacement immediate 8 # . op subop mod rm32 base index scale r32 9 # . 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes 10 11 # Return next byte value in eax, with top 3 bytes cleared. 12 # Abort on reaching end of stream. 13 read-byte: # s: (addr stream byte) -> result/eax: byte 14 # . prologue 15 55/push-ebp 16 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp 17 # . save registers 18 51/push-ecx 19 56/push-esi 20 # esi = s 21 8b/copy 1/mod/*+disp8 5/rm32/ebp . . . 6/r32/esi 8/disp8 . # copy *(ebp+8) to esi 22 # ecx = s->read 23 8b/copy 1/mod/*+disp8 6/rm32/esi . . . 1/r32/ecx 4/disp8 . # copy *(esi+4) to ecx 24 # if (f->read >= f->write) abort 25 3b/compare 0/mod/indirect 6/rm32/esi . . . 1/r32/ecx . . # compare ecx with *esi 26 0f 8d/jump-if->= $read-byte:<a href='317abort.subx.html#L5'>abort</a>/disp32 27 # result = f->data[f->read] 28 31/xor 3/mod/direct 0/rm32/eax . . . 0/r32/eax . . # clear eax 29 8a/copy-byte 1/mod/*+disp8 4/rm32/sib 6/base/esi 1/index/ecx . 0/r32/AL 0xc/disp8 . # copy byte at *(esi+ecx+12) to AL 30 # ++f->read 31 ff 0/subop/increment 1/mod/*+disp8 6/rm32/esi . . . . 4/disp8 . # increment *(esi+4) 32 $read-byte:end: 33 # . restore registers 34 5e/pop-to-esi 35 59/pop-to-ecx 36 # . epilogue 37 89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp 38 5d/pop-to-ebp 39 c3/return 40 41 $read-byte:<a href='317abort.subx.html#L5'>abort</a>: 42 (<a href='317abort.subx.html#L5'>abort</a> "read-byte: empty stream") 43 # never gets here 44 45 == data 46 47 _test-input-stream: # (stream byte) 48 # current write index 49 0/imm32 50 $_test-input-stream->read: 51 # current read index 52 0/imm32 53 # size 54 0x400/imm32 # 1024 bytes 55 # data (64 lines x 16 bytes/line) 56 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 57 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 58 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 59 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 60 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 62 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 63 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 64 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 65 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 66 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 67 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 68 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 69 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 70 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 71 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 73 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 74 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 75 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 76 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 77 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 78 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 79 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 81 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 82 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 83 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 84 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 85 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 86 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 87 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 88 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 89 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 90 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 91 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 92 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 93 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 94 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 95 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 96 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 97 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 98 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 99 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 100 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 101 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 102 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 103 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 104 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 105 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 106 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 107 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 108 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 109 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 110 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 111 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 112 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 113 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 114 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 115 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 116 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 117 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 118 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 119 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 120 121 # . . vim:nowrap:textwidth=0 </pre> </body> </html>