<html><head><base href="x-msg://543/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; 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letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div><span class="Apple-style-span" style="font-size: medium; ">On 15 Apr 2010, at 19:17, Jay K wrote:</span></div></span></span></span></span></span></span></span></span></div></span></span></div><div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div class="hmmessage" style="font-size: 10pt; font-family: Verdana; ">Rodney, right, I was wondering about traced vs. untraced also. I think having a traced pointer point outside the traced heap is ok though. The data will never be collected, the pointer never updated.</div></span></blockquote><div><br></div><div>There are assertions in the @M3paranoid collector that will complain if a reference outside the heap is not to a TEXT literal. Those should be the only ones we see. Correctness dictates that we use UNTRACED references (ADDRESS, UNTRACED REF...) here.</div><br><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div class="hmmessage" style="font-size: 10pt; font-family: Verdana; "> If the untraced data were ever freed (such as e.g. unloading the .dll! Which people usually forget about as a scenario..) then the traced pointers would go stale and there'd be a safety problem.<br> <br> <br>In either case I'm not "rewriting" it, because there is a "unified interface" between Posix and Win32, and I can't make it <*external*> in one but not the other, unless I fork the file, not particularly worthwhile.<br> <br> <br> - Jay<br> <br>> Date: Thu, 15 Apr 2010 17:44:07 -0500<br>> From:<span class="Apple-converted-space"> </span><a href="mailto:rodney_bates@lcwb.coop">rodney_bates@lcwb.coop</a><br>> To:<span class="Apple-converted-space"> </span><a href="mailto:m3devel@elegosoft.com">m3devel@elegosoft.com</a><br>> Subject: Re: [M3devel] Modula-3/C interop in Date/Time?<br>><span class="Apple-converted-space"> </span><br>> Since these pointer variables are initialized by<br>> C code and their referents are also provided by C code<br>> as global variables, shouldn't the type be untraced?<br>><span class="Apple-converted-space"> </span><br>> I suppose that, since they don't point into the traced<br>> heap, the collector implementation we have would quietly<br>> ignore them as roots. But that's relying on implementation-<br>> dependent information.<br>><span class="Apple-converted-space"> </span><br>> Also, if someone created a field of type Date.TimeZone,<br>> (or an array of them) in a traced-heap-allocated object,<br>> which is a perfectly legitimate thing to do, what would<br>> our collector do then?<br>><span class="Apple-converted-space"> </span><br>><span class="Apple-converted-space"> </span><br>><span class="Apple-converted-space"> </span><br>> Jay K wrote:<br>> > Is this legal/correct?<br>> ><span class="Apple-converted-space"> </span><br>> ><span class="Apple-converted-space"> </span><br>> > Date.i3:<br>> & gt; TYPE TimeZone <: REFANY;<br>> > VAR Local, UTC: TimeZone; (* granted, will maybe change these to extern *)<br>> ><span class="Apple-converted-space"> </span><br>> ><span class="Apple-converted-space"> </span><br>> > Date.m3: <br>> > REVEAL TimeZone = BRANDED "Date.TimeZone" REF INTEGER;<br>> > <br>> ><span class="Apple-converted-space"> </span><br>> > DatePosixC.c:<br>> > static const int Local = 0;<br>> > static const int UTC = 1;<br>> > extern const int const * const Date__Local = &Local;<br>> > extern const int const * const Date__UTC = &UTC;<br>> > <br>> ><span class="Apple-converted-space"> </span><br>> > - Jay<br></div></span></blockquote></div><br></body></html>