<html><head><base href="x-msg://43/"></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 22 Nov 2009, at 19:29, 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; ">Maybe:<br> <br>RunThread:<br>if stack_grows_down<br> stackbase = ADR(self)<br>else<br> stackbase = ADR(self) + BYTESIZE(self)<br> <br>Do we know the backend won't introduce local temporaries on the stack that contain traced pointers?<br></div></span></blockquote><div><br></div><div>We don't know that...</div><div>In fact, we assume that the backend will have traced pointers in regs.</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; ">Or, like, if there are traced temporaries in registers..they could be spilled to the stack..and not within the bounds<br>described the above?<br> <br> - Jay<br> <br><hr id="stopSpelling">From:<span class="Apple-converted-space"> </span><a href="mailto:jay.krell@cornell.edu">jay.krell@cornell.edu</a><br>To:<span class="Apple-converted-space"> </span><a href="mailto:hosking@cs.purdue.edu">hosking@cs.purdue.edu</a><br>Date: Mon, 23 Nov 2009 00:19:36 +0000<br>CC:<span class="Apple-converted-space"> </span><a href="mailto:m3commit@elegosoft.com">m3commit@elegosoft.com</a><br>Subject: Re: [M3commit] CVS Update: cm3<br><br>You think I should just leave Win32 using the same method?<br>No point scanning past that?<br> <br>I think, as I was saying the other day, there is a slight danger in the current code.<br>Imagine an aggressive optimizer inlines RunThread into ThreadBase.<br>I think when I manually inlined it I caused just such breakage.<br> <br>We need <*NOINLINE*>?<br> <br> - Jay<br> <br><hr id="ecxstopSpelling">Subject: Re: [M3commit] CVS Update: cm3<br>From:<span class="Apple-converted-space"> </span><a href="mailto:hosking@cs.purdue.edu">hosking@cs.purdue.edu</a><br>Date: Sun, 22 Nov 2009 18:52:31 -0500<br>CC:<span class="Apple-converted-space"> </span><a href="mailto:jkrell@elego.de">jkrell@elego.de</a>;<span class="Apple-converted-space"> </span><a href="mailto:m3commit@elegosoft.com">m3commit@elegosoft.com</a><br>To:<span class="Apple-converted-space"> </span><a href="mailto:jay.krell@cornell.edu">jay.krell@cornell.edu</a><br><br><div><span class="ecxecxApple-style-span" style="text-transform: none; text-indent: 0px; border-collapse: separate; font: normal normal normal 12px/normal Helvetica; white-space: normal; letter-spacing: normal; color: rgb(0, 0, 0); word-spacing: 0px; "><span class="ecxecxApple-style-span" style="text-transform: none; text-indent: 0px; border-collapse: separate; font: normal normal normal 12px/normal Helvetica; white-space: normal; letter-spacing: normal; color: rgb(0, 0, 0); word-spacing: 0px; "><div style="word-wrap: break-word; "><span class="ecxecxApple-style-span" style="text-transform: none; text-indent: 0px; border-collapse: separate; font: normal normal normal 12px/normal Helvetica; white-space: normal; letter-spacing: normal; color: rgb(0, 0, 0); word-spacing: 0px; "><span class="ecxecxApple-style-span" style="text-transform: none; text-indent: 0px; border-collapse: separate; font: normal normal normal 12px/normal Helvetica; white-space: normal; letter-spacing: normal; color: rgb(0, 0, 0); word-spacing: 0px; "><span class="ecxecxApple-style-span" style="text-transform: none; text-indent: 0px; border-collapse: separate; font: normal normal normal 12px/normal Helvetica; white-space: normal; letter-spacing: normal; color: rgb(0, 0, 0); word-spacing: 0px; "><span class="ecxecxApple-style-span" style="text-transform: none; text-indent: 0px; border-collapse: separate; font: normal normal normal 12px/normal Helvetica; white-space: normal; letter-spacing: normal; color: rgb(0, 0, 0); word-spacing: 0px; "><span class="ecxecxApple-style-span" style="text-transform: none; text-indent: 0px; border-collapse: separate; font: normal normal normal 12px/normal Helvetica; white-space: normal; letter-spacing: normal; color: rgb(0, 0, 0); word-spacing: 0px; "><span class="ecxecxApple-style-span" style="text-transform: none; text-indent: 0px; border-collapse: separate; font: normal normal normal 12px/normal Helvetica; white-space: normal; letter-spacing: normal; color: rgb(0, 0, 0); word-spacing: 0px; "><span class="ecxecxApple-style-span" style="text-transform: none; text-indent: 0px; border-collapse: separate; font: normal normal normal 12px/normal Helvetica; white-space: normal; letter-spacing: normal; color: rgb(0, 0, 0); word-spacing: 0px; "><span class="ecxecxApple-style-span" style="text-transform: none; text-indent: 0px; border-collapse: separate; font: normal normal normal 12px/normal Helvetica; white-space: normal; letter-spacing: normal; color: rgb(0, 0, 0); word-spacing: 0px; "><div><span class="ecxecxApple-style-span" style="font-size: medium; "><font class="ecxecxApple-style-span" color="#0000ff" face="'Gill Sans'">It is precise re traced refs. That's the lowest frame that can hold a traced reference.</font></span></div></span></span></span></span></span></span></span></span></div></span></span></div><br><div><div>On 22 Nov 2009, at 16:53, Jay K wrote:</div><br class="ecxecxApple-interchange-newline"><blockquote><span class="ecxecxApple-style-span" style="text-transform: none; text-indent: 0px; border-collapse: separate; font: normal normal normal medium/normal Helvetica; white-space: normal; letter-spacing: normal; word-spacing: 0px; "><div class="ecxecxhmmessage" style="font-family: Verdana; font-size: 10pt; ">The end of the stack isn't precise:<br> <br>C:\dev2\cm3.release_branch_cm3_5_8\m3-libs\m3core\src\thread\POSIX\ThreadPosix.m3(1058): self.stackbase := ADR(xx);<br> <br>"stack" here:<br> <br>void<br>ProcessContext(Context *c, void *stack,<br> void (*p) (void *start, void *stop))<br>{<br> if (stack < c->uc.uc_stack.ss_sp)<br> p(stack, c->uc.uc_stack.ss_sp);<br> else<br> p(c->uc.uc_stack.ss_sp, stack);<br>#ifdef __APPLE__<br> p(&(c->uc.uc_mcontext[0]), &(c->uc.uc_mcontext[1]));<br>#else<br> p(&c[0], &c[1]);<br>#endif<br>}<br><br> - Jay<br><br> <br>> From:<span class="ecxecxApple-converted-space"> </span><a href="mailto:hosking@cs.purdue.edu">hosking@cs.purdue.edu</a><br>> Date: Sun, 22 Nov 2009 13:41:26 -0500<br>> To:<span class="ecxecxApple-converted-space"> </span><a href="mailto:jkrell@elego.de">jkrell@elego.de</a><br>> CC:<span class="ecxecxApple-converted-space"> </span><a href="mailto:m3commit@elegosoft.com">m3commit@elegosoft.com</a><br>> Subject: Re: [M3commit] CVS Update: cm3<br>><span class="ecxecxApple-converted-space"> </span><br>> > Note that ThreadPosix.m3 could also implement such precise stackbase.<br>><span class="ecxecxApple-converted-space"> </span><br>> ThreadPosix *does* implement a precise stack base. It's obtained from the ucontext set in the thread switch routine (swapcontext).<br>><span class="ecxecxApple-converted-space"> </span><br>> > ThreadPThread.m3 probably often could, like with the functions on OpenBSD (broken) and FreeBSD, etc.<br>><span class="ecxecxApple-converted-space"> </span><br></div></span></blockquote></div><br></div></span><br class="Apple-interchange-newline"></blockquote></div><br></body></html>