<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Sounds like time to file a separate bug to track that issue down (particularly the bsd issue)<div>and move on with this one.</div><div><br></div><div>Thank you so much Dan for the history and details,</div><div>Karen</div><div><br><div><div>On Dec 19, 2012, at 11:30 AM, Daniel D. Daugherty wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
<meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type">
<div bgcolor="#FFFFFF" text="#000000">
<tt>Adding the other aliases back in...<br>
<br>
Harold,<br>
<br>
<tt>This question<tt>:<br>
<br>
<tt>> Another nit: Is it worth checking that all of<br>
<tt>> </tt>"/hotspot/libjvm.so"<tt> </tt><tt></tt>could
get copied to buf? (i.e.: that<br>
<tt>></tt> buflen-len > strlen("/hotspot/libjvm.so")<br>
<br>
<tt><tt>is straight forward and the short answer is<tt>:
yes, that<br>
<tt>code makes assumptions that "/hotspot/libjvm.so"
will<br>
<tt>fit in<tt>to 'buf'. It sho<tt>uld not do that.<br>
<br>
It is Ron's call<tt> </tt><tt>as to whether
he wants to fix this existing<br>
bug<tt> </tt>as part of this<tt> </tt><tt>work.
It is easy enough to fix the obvious<br>
<tt>part of the bug, but... as<tt> is
normal with HotS<tt>pot, there<br>
<tt>is more going on here than meets
the eye...</tt><br>
</tt></tt></tt></tt></tt></tt><br>
<tt>The slightly longer answer is that it pro<tt>bably
doesn't<br>
<tt>matter because the path being created
here is a fake.<br>
<tt>As long as the "<tt>/hotspot/l" part
gets copied, then the<br>
<tt>callers of os::jvm_path() will be
able to handle the<br>
<tt>fakery.</tt><br>
</tt></tt></tt><br>
<tt>Of course, there is an even longer
answer. Read on if<br>
<tt>you want go<tt>ry details<tt> (and a
history lesson).</tt></tt></tt><br>
</tt></tt></tt></tt></tt></tt></tt></tt><br>
</tt></tt></tt></tt></tt><tt><tt><tt><tt><tt><tt><tt><tt><tt><tt><tt><tt><tt><tt><tt><tt><tt><tt>This
gamma launcher stuff is giving
me an absolute headache.<br>
<tt>Unfortunately, there is a
lot of history involved
here...</tt><br>
<br>
<tt>Here are the variations:<br>
<br>
src/os/bsd/vm/os_bsd.cpp:<br>
<br>
<tt> 1715 if
(Arguments::created_by_gamma_launcher())
{<br>
1716 // Support for
the gamma launcher.
Typical value for buf is<br>
1717 //
"<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm".
If "/jre/lib/" appears at<br>
1718 // the right
place in the string, then
assume we are installed in
a JDK and<br>
1719 // we're
done. Otherwise, check
for a JAVA_HOME
environment variable and<br>
1720 // construct a
path to the JVM being
overridden.<br>
</tt><br>
<tt><snip></tt><br>
<br>
<tt> 1762 // If
the path exists within
JAVA_HOME, add the JVM
library name<br>
1763 // to
complete the path to JVM
being overridden.
Otherwise fallback<br>
1764 // to the
path to the current
library.<br>
1765 if (0 ==
access(buf, F_OK)) {<br>
1766 // Use
current module name
"libjvm"<br>
1767 len =
strlen(buf);<br>
1768
snprintf(buf + len,
buflen-len, "/libjvm%s",
JNI_LIB_SUFFIX);<br>
1769 } else {<br>
1770 // Fall
back to path of current
library<br>
1771 rp =
realpath(dli_fname, buf);<br>
1772 if (rp
== NULL)<br>
1773
return;<br>
1774 }<br>
</tt><br>
</tt>src/os/linux/vm/os_linux.cpp:<br>
<br>
<tt> 2206 if
(Arguments::created_by_gamma_launcher())
{<br>
2207 // Support for
the gamma launcher. Typical
value for buf is<br>
2208 //
"<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
If "/jre/lib/" appears at<br>
2209 // the right
place in the string, then
assume we are installed in a
JDK and<br>
2210 // we're done.
Otherwise, check for a
JAVA_HOME environment
variable and fix <br>
2211 // up the path
so it looks like libjvm.so
is installed there (append a<br>
2212 // fake suffix
hotspot/libjvm.so).<br>
<br>
<tt><snip><br>
<br>
</tt></tt><tt>
2243 if (0 ==
access(buf, F_OK)) {<br>
2244 // Use
current module name
"libjvm.so"<br>
2245 len =
strlen(buf);<br>
2246
snprintf(buf + len,
buflen-len,
"/hotspot/libjvm.so");<br>
2247 } else {<br>
2248 // Go back
to path of .so<br>
2249 rp =
realpath(dli_fname, buf);<br>
2250 if (rp ==
NULL)<br>
2251 return;<br>
2252 }<br>
</tt><br>
</tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt>src/os/solaris/vm/os_solaris.cpp:<br>
<br>
2496 if (Arguments::created_by_gamma_launcher())
{<br>
2497 // Support for the gamma launcher.
Typical value for buf is<br>
2498 //
"<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
If "/jre/lib/" appears at<br>
2499 // the right place in the string, then
assume we are installed in a JDK and<br>
2500 // we're done. Otherwise, check for a
JAVA_HOME environment variable and fix<br>
2501 // up the path so it looks like libjvm.so
is installed there (append a<br>
2502 // fake suffix hotspot/libjvm.so).<br>
<br>
<tt><snip><br>
<br>
</tt><tt> 2539 if (0 == access(buf, F_OK)) {<br>
2540 // Use current module name
"libjvm.so"<br>
2541 len = strlen(buf);<br>
2542 snprintf(buf + len, buflen-len,
"/hotspot/libjvm.so");<br>
2543 } else {<br>
2544 // Go back to path of .so<br>
2545 realpath((char *)dlinfo.dli_fname,
buf);<br>
2546 }<br>
</tt><br>
<tt>src/os/windows/vm/os_windows.cpp<tt>:<br>
<br>
<tt> 1732 buf[0] = '\0';<br>
1733 if
(Arguments::created_by_gamma_launcher()) {<br>
1734 // Support for the gamma launcher.
Check for an<br>
1735 // JAVA_HOME environment variable<br>
1736 // and fix up the path so it looks
like<br>
1737 // libjvm.so is installed there
(append a fake suffix<br>
1738 // hotspot/libjvm.so).<br>
1739 char* java_home_var =
::getenv("JAVA_HOME");<br>
1740 if (java_home_var != NULL
&& java_home_var[0] != 0) {<br>
1741 <br>
1742 strncpy(buf, java_home_var,
buflen);<br>
1743 <br>
1744 // determine if this is a legacy
image or modules image<br>
1745 // modules image doesn't have
"jre" subdirectory<br>
1746 size_t len = strlen(buf);<br>
1747 char* jrebin_p = buf + len;<br>
1748 jio_snprintf(jrebin_p,
buflen-len, "<a href="smb://jre//bin//">\\jre\\bin\\</a>");<br>
1749 if (0 != _access(buf, 0)) {<br>
1750 jio_snprintf(jrebin_p,
buflen-len, "<a href="smb://bin//">\\bin\\</a>");<br>
1751 }<br>
1752 len = strlen(buf);<br>
1753 jio_snprintf(buf + len,
buflen-len, "hotspot\\jvm.dll");<br>
1754 }<br>
1755 }<br>
</tt><br>
<br>
<tt>Linux, Solaris and Windows all recog<tt>nize
that if they<br>
<tt>get to <tt>the point where they are
appending a "hotspot/..."<br>
<tt>path to the jvm_path value, the<tt>n
they are mak<tt>ing a fake<br>
<tt>path. Why are they making a fake
path? Well, the gamma<br>
<tt>la<tt>uncher let<tt>s <tt>someone
use a libjvm.so/jvm.dll <tt>that
is<br>
<tt>not located in the
usual place in a JDK.
And, you get<br>
<tt>to use that
libjvm.so/jvm.dll <tt>WITH
THAT JDK. <tt>Sounds<br>
<tt>pretty cool<tt>
and it is
pretty cool...
<tt>u</tt>ntil
you realize<br>
<tt>that there
is code in the
VM that tries
to find other<br>
<tt>libraries
_relative_ to
the
libjvm.so/jvm.dll
that is<br>
<tt>running.
Ouch! So enter
the above code<tt>
blocks that
fake<br>
<tt>a path to
the <tt>libjvm.so/jvm.dll
so that
callers to<br>
<tt>os::jvm_path()
don't get
confused.<br>
<br>
<tt>To make
matters more
conv<tt>oluted...
yes, I <tt>know
this is<br>
<tt>convoluted
<tt>enough...
The <tt>os_bsd.cpp
doesn't seem
to<br>
<tt>realize
that it is
creating a
fake path <tt>here.
At one<br>
<tt>point, the
os_bs<tt>d.<tt>cpp
code was a
copy of
os_linux.cpp<br>
<tt>code<tt>,
but it was ob<tt>viously
tweaked. It
will take more<br>
<tt>investigation
to figure out
the right
course of
action<br>
<tt>for
os_bsd.cpp<br>
<br>
<tt><tt>Dan<br>
<br>
</tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt></tt><br>
<br>
</tt></tt></tt>On 12/19/12 7:51 AM, harold seigel wrote:<br>
<blockquote cite="mid:50D1D461.50109@oracle.com" type="cite">
<meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type">
Hi Ron,<br>
<br>
I'm ok with using snprinft().<br>
<br>
Another nit: Is it worth checking that all of "/hotspot/libjvm.so"
could get copied to buf? (i.e.: that buflen-len >
strlen("/hotspot/libjvm.so")<br>
<br>
Thanks, Harold<br>
<br>
On 12/19/2012 9:17 AM, Ron Durbin wrote:
<blockquote cite="mid:955b2245-7480-4af0-bd88-16eb1dd5856a@default" type="cite">
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<div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Harold,<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Did
you have any more points or counter points to make on the
use of snprintf and strncpy ?<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Ron<o:p></o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
Ron Durbin <br>
<b>Sent:</b> Tuesday, December 18, 2012 4:50 PM<br>
<b>To:</b> Daniel Daugherty; <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:hotspot-runtime-dev@openjdk.java.net">hotspot-runtime-dev@openjdk.java.net</a>;
build-dev; <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:serviceability-dev@openjdk.java.net">serviceability-dev@openjdk.java.net</a><br>
<b>Subject:</b> RE: Code Review fix for 8005044 remove
crufty '_g' support from HS runtime code<o:p></o:p></span></p>
</div>
</div><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks
for the quick reviews by all.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I
will agree with Dan on this one, sprint will stay.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Ron<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
Daniel D. Daugherty <br>
<b>Sent:</b> Tuesday, December 18, 2012 4:03 PM<br>
<b>To:</b> <a moz-do-not-send="true" href="mailto:hotspot-runtime-dev@openjdk.java.net">hotspot-runtime-dev@openjdk.java.net</a>;
build-dev; <a moz-do-not-send="true" href="mailto:serviceability-dev@openjdk.java.net">serviceability-dev@openjdk.java.net</a><br>
<b>Subject:</b> Re: Code Review fix for 8005044 remove
crufty '_g' support from HS runtime code<o:p></o:p></span></p>
</div>
</div><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal" style="margin-bottom:12.0pt"><tt><span style="font-size:10.0pt">Sorry, I lost my manners
somewhere... :-(</span></tt><span style="font-size:10.0pt;font-family:"Courier
New""><br>
<br>
<tt>Thanks for the fast review!</tt><br>
<br>
<tt>Dan</tt></span><o:p></o:p></p>
<div><p class="MsoNormal">On 12/18/12 3:57 PM, Daniel D.
Daugherty wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"><p class="MsoNormal" style="margin-bottom:12.0pt"><tt><span style="font-size:10.0pt">Adding back in the other
aliases...</span></tt><span style="font-size:10.0pt;font-family:"Courier
New""><br>
<br>
<tt>Harold,</tt><br>
<br>
<tt>The equivalent of:</tt><br>
<br>
<tt> snprintf(buf, n, str);</tt><br>
<br>
<tt>is:</tt><br>
<br>
<tt> strncpy(buf, str, n - 1);</tt><br>
<tt> buf[n - 1] = '\0';</tt><br>
<br>
<tt>because snprintf() will only write out (n - 1) bytes
from</tt><br>
<tt>'str' to 'buf' and then write a NUL in the last
slot.</tt><br>
<tt>strncpy() copies up to 'n' bytes from 'str' to
'buf'.</tt><br>
<tt>strncpy() will not copy past a NUL character in
'str', but</tt><br>
<tt>it will also not NUL terminate 'buf' if a NUL is not
found</tt><br>
<tt>in 'str' before the limit 'n' is reached.</tt><br>
<br>
<tt>Dan</tt></span><o:p></o:p></p>
<div><p class="MsoNormal">On 12/18/12 2:48 PM, harold seigel
wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"><p class="MsoNormal">Hi Ron,<br>
<br>
I think these calls to snprintf() in os_solaris.cpp and
the other os_....cpp files could be replaced with calls
to strncpy(). It might be a little simpler.<br>
<br>
Otherwise, it looks good.<br>
<br>
Thanks, Harold<br>
<br>
2539 if (0 == access(buf, F_OK)) { <br>
<span class="changed">2540 // Use current module name
"libjvm.so"</span> <br>
2541 len = strlen(buf); <br>
<span class="changed">2542 <b>snprintf(buf + len,
buflen-len, "/hotspot/libjvm.so");</b></span> <br>
2543 } else { <br>
2544 // Go back to path of .so <br>
2545 realpath((char *)dlinfo.dli_fname, buf); 2546 } <br>
<br>
On 12/18/2012 3:46 PM, Daniel D. Daugherty wrote: <o:p></o:p></p><p class="MsoNormal" style="margin-bottom:12.0pt"><tt><span style="font-size:11.0pt">Greetings,</span></tt><span style="font-size:11.0pt;font-family:"Courier
New""><br>
<br>
</span><tt><span style="font-size:10.0pt">I'm sponsoring
this code review request from Ron Durbin. This
change</span></tt><span style="font-size:11.0pt;font-family:"Courier
New""><br>
</span><tt><span style="font-size:10.0pt">is targeted at
JDK8/HSX-25 in the RT_Baseline repo.</span></tt><span style="font-size:11.0pt;font-family:"Courier
New""><br>
<br>
</span><tt><span style="font-size:10.0pt">Dan</span></tt><span style="font-size:11.0pt;font-family:"Courier
New""><br>
<br>
</span><tt><span style="font-size:10.0pt">Sending again
with correct subject line, bug URLs and webrev URL.</span></tt><span style="font-size:11.0pt;font-family:"Courier
New""><br>
<br>
</span><span style="font-size:10.0pt;font-family:"Courier
New""><br>
<tt>Intro:</tt><br>
<tt> </tt><br>
<tt>This set of changes removes the runtime support
for generation of debug versions that follow _g
semantics.</tt><br>
<tt> </tt><br>
<tt>Defect:</tt><br>
</span><tt><span style="font-size:9.0pt">JDK-8005044
remove crufty '_g' support from HS runtime code</span></tt><span style="font-size:10.0pt;font-family:"Courier
New""><br>
<tt><a moz-do-not-send="true" href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8005044">http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8005044</a></tt><br>
<tt><a moz-do-not-send="true" href="https://jbs.oracle.com/bugs/browse/JDK-8005044">https://jbs.oracle.com/bugs/browse/JDK-8005044</a></tt><br>
<br>
<br>
<tt>Webrev</tt><br>
<tt><a moz-do-not-send="true" href="http://cr.openjdk.java.net/%7Edcubed/for_rdurbin/8005044-webrev/0">http://cr.openjdk.java.net/~dcubed/for_rdurbin/8005044-webrev/0</a>
</tt><br>
<br>
<tt> </tt><br>
<tt>Details:</tt><br>
</span><tt><span style="font-size:11.0pt">Files </span></tt><tt><span style="font-size:10.0pt">have been modified to
remove all reference and support for debug versions
that follow _g semantics.</span></tt><span style="font-size:10.0pt;font-family:"Courier
New""><br>
</span><tt><span style="font-size:11.0pt"> </span></tt><span style="font-size:10.0pt;font-family:"Courier
New""><br>
</span><tt><span style="font-size:11.0pt">Testing:</span></tt><span style="font-size:10.0pt;font-family:"Courier
New""><br>
</span><tt><span style="font-size:11.0pt"> </span></tt><span style="font-size:10.0pt;font-family:"Courier
New""><br>
</span><tt><span style="font-size:11.0pt">Passed JPRT
last night:</span></tt><span style="font-size:10.0pt;font-family:"Courier
New""><br>
</span><tt><span style="font-size:11.0pt"> </span></tt><span style="font-size:10.0pt;font-family:"Courier
New""><br>
</span><tt><span style="font-size:11.0pt">Additional
Testing In process: (suggested by Dan)</span></tt><tt><span style="font-size:10.0pt">:</span></tt><span style="font-size:10.0pt;font-family:"Courier
New""><br>
<br>
<tt>src/share/vm/runtime/arguments.cpp</tt><br>
<tt> - test with shared archive creation and use;
see the e-mail</tt><br>
<tt> from Coleen</tt><br>
<br>
<tt>src/share/tools/ProjectCreator/ProjectCreator.java</tt><br>
<tt> - just a usage message; visual inspection of
the code</tt><br>
<br>
<tt>src/os/windows/vm/os_windows.cpp</tt><br>
<tt> - comments only; no testing needed</tt><br>
<br>
<tt>src/os/{bsd,linux,solaris}/vm/os_{bsd,linux,solaris}.cpp</tt><br>
<tt> - the only code changes come into play when
the "gamma"</tt><br>
<tt> launcher is used</tt><br>
<tt> - and when JAVA_HOME refers to a valid JDK,
the function</tt><br>
<tt> fakes up a JVM path so that callers using
the JVM path</tt><br>
<tt> to find other things in the JDK will work.</tt><br>
<tt> - I can't find any way that the actual JVM
path value</tt><br>
<tt> that is returned is exposed</tt><br>
<tt> - I don't see a way to test this other than
have a debug</tt><br>
<tt> printf() or manual code inspection.</tt></span><o:p></o:p></p>
</blockquote><p class="MsoNormal"><o:p> </o:p></p>
</blockquote><p class="MsoNormal"><o:p> </o:p></p>
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