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<p class="MsoNormal" style="margin-left:.5in"><b>From:</b> Vm-dev [mailto:vm-dev-bounces@lists.squeakfoundation.org]
<b>On Behalf Of </b>Ben Coman<br>
<b>Sent:</b> Thursday, April 19, 2018 19:00<br>
<b>To:</b> Open Smalltalk Virtual Machine Development Discussion <vm-dev@lists.squeakfoundation.org><br>
<b>Subject:</b> Re: [Vm-dev] VM debugging - breakpoint issue on Windows<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">On 20 April 2018 at 07:45, <Vincent.Blondeau@lamresearch.com> wrote:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> *From:* Vm-dev [mailto:vm-dev-bounces@lists.squeakfoundation.org] *On<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> Behalf Of *Eliot Miranda<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> *Sent:* Thursday, April 19, 2018 14:08<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> *To:* Open Smalltalk Virtual Machine Development Discussion <vm-dev@lists.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> squeakfoundation.org><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> *Subject:* Re: [Vm-dev] VM debugging - breakpoint issue on Windows<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> Hi Vincent,<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> > On Apr 19, 2018, at 1:49 PM, <Vincent.Blondeau@lamresearch.com> <<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> Vincent.Blondeau@lamresearch.com> wrote:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> ><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> > Hi all,<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> ><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> > So I tested an hello world project, by trying different compilation<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> options. Knowing that the ones that are in use to generate the .exe are:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> > -mwindows -m32 -mthreads -Wl,--large-address-aware,--<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> dynamicbase,--nxcompat,--export-all-symbols<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> ><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> ><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> > I identified that having all the options expect export-all-symbols,<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> works perfectly.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> > And having all the options except dynamicbase works too.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> Great, thanks!<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> ><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> > I suppose that the options of the linker dynamicbase and<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> export-all-symbols are conflicting and avoid to debug the app.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> ><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> > I will try to remove one and retry with the VM.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> ><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> > BTW, I have no idea of what these options do…<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> export-all-symbols tells the linker that all non-static symbols should be<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> made available to dlls. In Windows, exporting is by a funky mechanism, an<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> export table, instead of, as in Unix, by run-time/load-time linking. Using<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> export-all-symbols avoids us having to use a .def file to specify the<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> exports we need. So if you find out that things work properly without<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> export-all-symbols then we shall have to maintain a .def file.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> Bah...<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> I removed both options and recompiled, your breakpoint is reached in<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> parseVMArgs !<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">Did that the produce a DEF file? which gdb would have loaded symbols from?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Yes, it did. See attachment<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">With the original compile options, did you try...<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">$ gdb <executable><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">> dll-symbols <dllname.dll><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">per libin_v's answer here...<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">https://urldefense.proofpoint.com/v2/url?u=https-3A__www.experts-2Dexchange.com_questions_23792765_How-2Dto-2Ddebug-2Da-2DDLL-2Dusing-2DMinGW.html&d=DwIFaQ&c=RWI7EqL8K9lqtga8KxgfzvOYoob76EZWE0yAO85PVMQ&r=kIZIYXBAA3fhM7P5HOuTC5w6mnEApTfXPTq3lR34ZiY&m=VTBZ347Znkcb19dYAJpyGZbBH9kSN94xqgGbyASiY68&s=FMXQC5QfsEaoN2zTiVeKE1jgSwYDqtgbcOX9oiMQZkE&e=<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">(disclaimer, I'm not familiar with it. Its just interesting to search around learning more about it.)<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal">I did not export the plugin as a DLL, the function I added is in an internal plugin. So it is embedded in the Pharo.exe.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">-------------<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">Also, here is a suggestion that dynamicbase Address Space Layout<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">Randomization may cause a problem with gdb (maybe a gdb bug)<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.gnu.org_archive_html_qemu-2Ddiscuss_2016-2D04_msg00043.html&d=DwIFaQ&c=RWI7EqL8K9lqtga8KxgfzvOYoob76EZWE0yAO85PVMQ&r=kIZIYXBAA3fhM7P5HOuTC5w6mnEApTfXPTq3lR34ZiY&m=VTBZ347Znkcb19dYAJpyGZbBH9kSN94xqgGbyASiY68&s=-LGIXGLImWQUDpFZvMnBEr-3YP6qSZG0GCbckgRa0GA&e=<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal">Interesting! But, for the debug version, we may not need of these options, may we?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Also, I am successfully debugging the primitive I am writing.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Vincent<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">cheers -ben<o:p></o:p></p>
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