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* snapshot of project "lynx", label v2-8-8dev_6fThomas E. Dickey2010-12-091-10/+11
* snapshot of project "lynx", label v2-8-8dev_3cThomas E. Dickey2010-05-031-0/+191
* snapshot of project "lynx", label v2_8_8dev_6cThomas E. Dickey2010-04-291-191/+0
* snapshot of project "lynx", label v2-8-7dev_13dThomas E. Dickey2009-03-171-1/+2
* snapshot of project "lynx", label v2-8-7dev_12aThomas E. Dickey2009-01-021-13/+24
* snapshot of project "lynx", label v2-8-7dev_4cThomas E. Dickey2007-05-041-8/+11
* snapshot of project "lynx", label v2-8-6dev_12Thomas E. Dickey2005-06-021-0/+1
* snapshot of project "lynx", label v2-8-6dev_10Thomas E. Dickey2005-01-021-88/+90
* snapshot of project "lynx", label v2-8-6dev_9Thomas E. Dickey2004-12-301-1/+2
* snapshot of project "lynx", label v2-8-6dev_3Thomas E. Dickey2004-05-071-42/+41
* snapshot of project "lynx", label v2-8-6dev_2Thomas E. Dickey2004-04-271-2/+2
* snapshot of project "lynx", label v2-8-5dev_15Thomas E. Dickey2003-04-281-1/+1
* snapshot of project "lynx", label v2-8-5dev_11Thomas E. Dickey2002-12-021-3/+3
* snapshot of project "lynx", label v2-8-5dev_9Thomas E. Dickey2002-10-071-22/+16
* snapshot of project "lynx", label v2-8-5dev_6Thomas E. Dickey2002-01-021-11/+23
* snapshot of project "lynx", label v2-8-4dev_21Thomas E. Dickey2001-06-031-0/+49
* snapshot of project "lynx", label v2-8-4dev_20Thomas E. Dickey2001-04-021-20/+12
* snapshot of project "lynx", label v2-8-4dev_17Thomas E. Dickey2001-02-091-1/+1
* snapshot of project "lynx", label v2-8-4dev_4Thomas E. Dickey2000-06-231-0/+7
* snapshot of project "lynx", label v2-8-3dev_16Thomas E. Dickey1999-12-011-1/+0
* snapshot of project "lynx", label v2-8-3dev_15Thomas E. Dickey1999-11-181-0/+13
* snapshot of project "lynx", label v2-8-2dev_8Thomas E. Dickey1998-12-031-4/+0
* snapshot of project "lynx", label v2-8-2dev_2Thomas E. Dickey1998-11-101-4/+3
* snapshot of project "lynx", label v2-8-1dev_4Thomas E. Dickey1998-11-061-3/+4
* snapshot of project "lynx", label v2-8-1dev_22Thomas E. Dickey1998-08-211-4/+3
* snapshot of project "lynx", label v2-8-1dev_5Thomas E. Dickey1998-03-291-3/+3
* snapshot of project "lynx", label v2-7-1ac-0_111Thomas E. Dickey1998-01-281-16/+16
* snapshot of project "lynx", label v2-7-1ac_0-89Thomas E. Dickey1997-10-271-1/+1
* snapshot of project "lynx", label v2-7-1ac_0-36Thomas E. Dickey1997-07-181-3/+5
* snapshot of project "lynx", label v2-7-1ac_0-28Thomas E. Dickey1997-05-251-0/+15
* snapshot of project "lynx", label v2_6fm_970129Thomas E. Dickey1997-01-291-4/+11
* snapshot of project "lynx", label v2_6_961130Thomas E. Dickey1996-11-301-7/+2
* snapshot of project "lynx", label v2_6Thomas E. Dickey1996-09-021-0/+93
an> content="none"> <meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy="> <meta name="colorscheme" content="minimal-dark"> <style type="text/css"> <!-- pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #a8a8a8; } body { font-size:12pt; font-family: monospace; color: #000000; background-color: #a8a8a8; } a { color:inherit; } * { font-size:12pt; font-size: 1em; } .subxComment { color: #005faf; } .subxS1Comment { color: #0000af; } .LineNr { } .Constant { color: #008787; } .SpecialChar { color: #d70000; } .subxMinorFunction { color: #875f5f; } .CommentedCode { color: #8a8a8a; } --> </style> <script type='text/javascript'> <!-- /* function to open any folds containing a jumped-to line before jumping to it */ function JumpToLine() { var lineNum; lineNum = window.location.hash; lineNum = lineNum.substr(1); /* strip off '#' */ if (lineNum.indexOf('L') == -1) { lineNum = 'L'+lineNum; } var lineElem = document.getElementById(lineNum); /* Always jump to new location even if the line was hidden inside a fold, or * we corrected the raw number to a line ID. */ if (lineElem) { lineElem.scrollIntoView(true); } return true; } if ('onhashchange' in window) { window.onhashchange = JumpToLine; } --> </script> </head> <body onload='JumpToLine();'> <a href='https://github.com/akkartik/mu/blob/main/linux/313index-bounds-check.subx'>https://github.com/akkartik/mu/blob/main/linux/313index-bounds-check.subx</a> <pre id='vimCodeElement'> <span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Helper to check an array's bounds, and to abort if they're violated.</span> <span id="L2" class="LineNr"> 2 </span><span class="subxComment"># Really only intended to be called from code generated by mu.subx.</span> <span id="L3" class="LineNr"> 3 </span> <span id="L4" class="LineNr"> 4 </span>== code <span id="L5" class="LineNr"> 5 </span> <span id="L6" class="LineNr"> 6 </span><span class="subxMinorFunction">__check-mu-array-bounds</span>: <span class="subxComment"># index: int, elem-size: int, arr-size: int, function-name: (addr array byte), array-name: (addr array byte)</span> <span id="L7" class="LineNr"> 7 </span> <span class="subxS1Comment"># . prologue</span> <span id="L8" class="LineNr"> 8 </span> 55/push-ebp <span id="L9" class="LineNr"> 9 </span> 89/&lt;- %ebp 4/r32/esp <span id="L10" class="LineNr"> 10 </span> <span class="subxS1Comment"># . save registers</span> <span id="L11" class="LineNr"> 11 </span> 50/push-eax <span id="L12" class="LineNr"> 12 </span> 51/push-ecx <span id="L13" class="LineNr"> 13 </span> 52/push-edx <span id="L14" class="LineNr"> 14 </span> <span class="subxS1Comment"># . not bothering saving ebx; it's only clobbered if we're going to abort</span> <span id="L15" class="LineNr"> 15 </span> <span class="subxComment"># ecx = arr-size</span> <span id="L16" class="LineNr"> 16 </span> 8b/-&gt; *(ebp+0x10) 1/r32/ecx <span id="L17" class="LineNr"> 17 </span> <span class="subxComment"># var overflow/edx: int = 0</span> <span id="L18" class="LineNr"> 18 </span> ba/copy-to-edx 0/imm32 <span id="L19" class="LineNr"> 19 </span> <span class="subxComment"># var offset/eax: int = index * elem-size</span> <span id="L20" class="LineNr"> 20 </span> 8b/-&gt; *(ebp+8) 0/r32/eax <span id="L21" class="LineNr"> 21 </span> f7 4/subop/multiply-eax-with *(ebp+0xc) <span id="L22" class="LineNr"> 22 </span> <span class="subxComment"># check for overflow</span> <span id="L23" class="LineNr"> 23 </span> 81 7/subop/compare %edx 0/imm32 <span id="L24" class="LineNr"> 24 </span> 0f 85/jump-if-!= <a href='313index-bounds-check.subx.html#L6'>__check-mu-array-bounds</a>:overflow/disp32 <span id="L25" class="LineNr"> 25 </span> <span class="subxComment"># check bounds</span> <span id="L26" class="LineNr"> 26 </span> 39/compare %eax 1/r32/ecx <span id="L27" class="LineNr"> 27 </span> 0f 82/jump-if-unsigned&lt; $__check-mu-array-bounds:end/disp32 <span class="subxComment"># negative index should always abort</span> <span id="L28" class="LineNr"> 28 </span> <span class="subxComment"># abort if necessary</span> <span id="L29" class="LineNr"> 29 </span> (<a href='116write-buffered.subx.html#L8'>write-buffered</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span> <span class="Constant">&quot;fn &quot;</span>) <span id="L30" class="LineNr"> 30 </span> (<a href='116write-buffered.subx.html#L8'>write-buffered</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span> *(ebp+0x14)) <span id="L31" class="LineNr"> 31 </span> (<a href='116write-buffered.subx.html#L8'>write-buffered</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span> <span class="Constant">&quot;: offset &quot;</span>) <span id="L32" class="LineNr"> 32 </span> (<a href='117write-int-hex.subx.html#L288'>write-int32-hex-buffered</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span> %eax) <span id="L33" class="LineNr"> 33 </span> (<a href='116write-buffered.subx.html#L8'>write-buffered</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span> <span class="Constant">&quot; is too large for array '&quot;</span>) <span id="L34" class="LineNr"> 34 </span> (<a href='116write-buffered.subx.html#L8'>write-buffered</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span> *(ebp+0x18)) <span id="L35" class="LineNr"> 35 </span> (<a href='116write-buffered.subx.html#L8'>write-buffered</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span> <span class="Constant">&quot;'\n&quot;</span>) <span id="L36" class="LineNr"> 36 </span> (<a href='115write-byte.subx.html#L81'>flush</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span>) <span id="L37" class="LineNr"> 37 </span> <span class="subxComment"># exit(1)</span> <span id="L38" class="LineNr"> 38 </span> bb/copy-to-ebx 1/imm32 <span id="L39" class="LineNr"> 39 </span> e8/call <a href='000init.subx.html#L18'>syscall_exit</a>/disp32 <span id="L40" class="LineNr"> 40 </span> <span class="subxComment"># never gets here</span> <span id="L41" class="LineNr"> 41 </span><span class="Constant">$__check-mu-array-bounds:end</span>: <span id="L42" class="LineNr"> 42 </span> <span class="subxS1Comment"># . restore registers</span> <span id="L43" class="LineNr"> 43 </span> 5a/pop-to-edx <span id="L44" class="LineNr"> 44 </span> 59/pop-to-ecx <span id="L45" class="LineNr"> 45 </span> 58/pop-to-eax <span id="L46" class="LineNr"> 46 </span> <span class="subxS1Comment"># . epilogue</span> <span id="L47" class="LineNr"> 47 </span> 89/&lt;- %esp 5/r32/ebp <span id="L48" class="LineNr"> 48 </span> 5d/pop-to-ebp <span id="L49" class="LineNr"> 49 </span> c3/return <span id="L50" class="LineNr"> 50 </span> <span id="L51" class="LineNr"> 51 </span><span class="subxMinorFunction">__check-mu-array-bounds:overflow</span>: <span id="L52" class="LineNr"> 52 </span> <span class="subxComment"># &quot;fn &quot; function-name &quot;: offset to array '&quot; array-name &quot;' overflowed 32 bits\n&quot;</span> <span id="L53" class="LineNr"> 53 </span> (<a href='116write-buffered.subx.html#L8'>write-buffered</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span> <span class="Constant">&quot;fn &quot;</span>) <span id="L54" class="LineNr"> 54 </span> (<a href='116write-buffered.subx.html#L8'>write-buffered</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span> *(ebp+0x14)) <span id="L55" class="LineNr"> 55 </span> (<a href='116write-buffered.subx.html#L8'>write-buffered</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span> <span class="Constant">&quot;: offset to array '&quot;</span>) <span id="L56" class="LineNr"> 56 </span> (<a href='116write-buffered.subx.html#L8'>write-buffered</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span> *(ebp+0x18)) <span id="L57" class="LineNr"> 57 </span> (<a href='116write-buffered.subx.html#L8'>write-buffered</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span> <span class="Constant">&quot;' overflowed 32 bits\n&quot;</span>) <span id="L58" class="LineNr"> 58 </span> (<a href='115write-byte.subx.html#L81'>flush</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span>) <span id="L59" class="LineNr"> 59 </span> <span class="subxComment"># exit(1)</span> <span id="L60" class="LineNr"> 60 </span> bb/copy-to-ebx 1/imm32 <span id="L61" class="LineNr"> 61 </span> e8/call <a href='000init.subx.html#L18'>syscall_exit</a>/disp32 <span id="L62" class="LineNr"> 62 </span> <span class="subxComment"># never gets here</span> <span id="L63" class="LineNr"> 63 </span> <span id="L64" class="LineNr"> 64 </span><span class="subxComment"># potential alternative</span> <span id="L65" class="LineNr"> 65 </span> <span id="L66" class="LineNr"> 66 </span><span class="CommentedCode">#? __bounds-check: # msg: (addr array byte)</span> <span id="L67" class="LineNr"> 67 </span><span class="CommentedCode">#? (write-buffered Stderr &quot;abort: array bounds exceeded in fn &quot;)</span> <span id="L68" class="LineNr"> 68 </span><span class="CommentedCode">#? 8b/-&gt; *(esp+4) 0/r32/eax # we're going to abort, so just clobber away</span> <span id="L69" class="LineNr"> 69 </span><span class="CommentedCode">#? (write-buffered Stderr %eax)</span> <span id="L70" class="LineNr"> 70 </span><span class="CommentedCode">#? (write-buffered Stderr Newline)</span> <span id="L71" class="LineNr"> 71 </span><span class="CommentedCode">#? # exit(1)</span> <span id="L72" class="LineNr"> 72 </span><span class="CommentedCode">#? bb/copy-to-ebx 1/imm32</span> <span id="L73" class="LineNr"> 73 </span><span class="CommentedCode">#? e8/call syscall_exit/disp32</span> <span id="L74" class="LineNr"> 74 </span> <span id="L75" class="LineNr"> 75 </span><span class="subxComment"># to be called as follows:</span> <span id="L76" class="LineNr"> 76 </span><span class="subxComment"># var/reg &lt;- index arr/rega: (addr array T), idx/regi: int</span> <span id="L77" class="LineNr"> 77 </span><span class="subxComment"># | if size-of(T) is 1, 2, 4 or 8</span> <span id="L78" class="LineNr"> 78 </span><span class="subxComment"># =&gt; # temporarily save array size to reg to check bounds</span> <span id="L79" class="LineNr"> 79 </span><span class="subxComment"># &quot;8b/-&gt; *&quot; rega &quot; &quot; reg &quot;/r32&quot;</span> <span id="L80" class="LineNr"> 80 </span><span class="subxComment"># &quot;c1/shift 5/subop/right %&quot; reg &quot; &quot; log2(size-of(T)) &quot;/imm32&quot;</span> <span id="L81" class="LineNr"> 81 </span><span class="subxComment"># &quot;3b/compare &quot; reg &quot;/r32 *&quot; rega</span> <span id="L82" class="LineNr"> 82 </span><span class="subxComment"># &quot;68/push \&quot;&quot; function &quot;\&quot;/imm32&quot; # pass function name to error message</span> <span id="L83" class="LineNr"> 83 </span><span class="subxComment"># &quot;0f 8d/jump-if-&gt;= __bounds_check/disp32&quot;</span> <span id="L84" class="LineNr"> 84 </span><span class="subxComment"># &quot;81 0/subop/add %esp 4/imm32&quot; # drop function name</span> <span id="L85" class="LineNr"> 85 </span><span class="subxComment"># # actually save the index addr in reg</span> <span id="L86" class="LineNr"> 86 </span><span class="subxComment"># &quot;8d/copy-address *(&quot; rega &quot;+&quot; regi &quot;&lt;&lt;&quot; log2(size-of(T)) &quot;+4) &quot; reg &quot;/r32&quot;</span> <span id="L87" class="LineNr"> 87 </span> <span id="L88" class="LineNr"> 88 </span><span class="subxMinorFunction">__mu-abort-null-index-base-address</span>: <span id="L89" class="LineNr"> 89 </span> (<a href='116write-buffered.subx.html#L8'>write-buffered</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span> <span class="Constant">&quot;null address in 'index'\n&quot;</span>) <span id="L90" class="LineNr"> 90 </span> (<a href='115write-byte.subx.html#L81'>flush</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span>) <span id="L91" class="LineNr"> 91 </span> <span class="subxComment"># exit(1)</span> <span id="L92" class="LineNr"> 92 </span> bb/copy-to-ebx 1/imm32 <span id="L93" class="LineNr"> 93 </span> e8/call <a href='000init.subx.html#L18'>syscall_exit</a>/disp32 <span id="L94" class="LineNr"> 94 </span> <span class="subxComment"># never gets here</span> <span id="L95" class="LineNr"> 95 </span> <span id="L96" class="LineNr"> 96 </span><span class="subxMinorFunction">__mu-abort-null-get-base-address</span>: <span id="L97" class="LineNr"> 97 </span> (<a href='116write-buffered.subx.html#L8'>write-buffered</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span> <span class="Constant">&quot;null address in 'get'\n&quot;</span>) <span id="L98" class="LineNr"> 98 </span> (<a href='115write-byte.subx.html#L81'>flush</a> <span class="SpecialChar"><a href='116write-buffered.subx.html#L209'>Stderr</a></span>) <span id="L99" class="LineNr"> 99 </span> <span class="subxComment"># exit(1)</span> <span id="L100" class="LineNr">100 </span> bb/copy-to-ebx 1/imm32 <span id="L101" class="LineNr">101 </span> e8/call <a href='000init.subx.html#L18'>syscall_exit</a>/disp32 <span id="L102" class="LineNr">102 </span> <span class="subxComment"># never gets here</span> </pre> </body> </html> <!-- vim: set foldmethod=manual : -->