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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">Hi all,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">I am using LLVM C++ in my project. Everything is good except exception. (version 6.0.1 release)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">Version: 6.0.1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">PLATFORM: arm 32 little endian.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">A normal test case for try{}…. Catch(…) test case will crash. (RTTI, STL test cases work fine.)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">Compiler CLANG, with –frtti –fexpceptions options.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">Crashed Information:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span lang="EN-US" style="font-size:12.0pt"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:12.0pt">Crashed in ‘<span style="color:red">scan_eh_tab</span>’ function in `<span style="color:red">src/cxa_personality.cpp
</span>`.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:6.0pt"><span lang="EN-US" style="font-size:12.0pt">715 const __shim_type_info* catchType =<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">716 get_shim_type_info(static_cast<uint64_t>(ttypeIndex),<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">717 classInfo, ttypeEncoding,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">718 native_exception, unwind_exception); // get catchType by calling get_shim_type_info.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">……<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:6.0pt"><span lang="EN-US" style="font-size:12.0pt">760 printf(" => catchType->name()=%s\n", catchType->name()); //
<b><span style="color:red">visit catchType->name(); don’t crash</span></b>. But the name() is empty, I wonder if there is something wrong with RTTI??<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:6.0pt"><span lang="EN-US" style="font-size:12.0pt">761 printf("before can catch can catch => excpType=%p, adjustedPtr=%p, catchType=%s\n", excpType, adjustedPtr, typeid(*catchType).name()); //
<b><span style="color:red">if add a typeid(*catchType).name(), crashed here<o:p></o:p></span></b></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">762 if (catchType->can_catch(excpType, adjustedPtr)) ///<span style="color:red">
<b>normally crashed here.</b></span><b>. if remove this function call, the exception test could work fine for the basic test case.<o:p></o:p></b></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">763 {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:6.0pt"><span lang="EN-US" style="font-size:12.0pt">341 static const __shim_type_info*<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">342 get_shim_type_info(uint64_t ttypeIndex, const uint8_t* classInfo,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">343 uint8_t ttypeEncoding, bool native_exception,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">344 _Unwind_Exception* unwind_exception)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">345 {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">346 if (classInfo == 0)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">347 {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">348 // this should not happen. Indicates corrupted eh_table.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">349 call_terminate(native_exception, unwind_exception);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">350 }<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">351<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">352 assert(((ttypeEncoding == DW_EH_PE_absptr) || // LLVM or GCC 4.6<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">353 (ttypeEncoding == DW_EH_PE_pcrel) || // GCC 4.7 baremetal<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">354 (ttypeEncoding == (DW_EH_PE_pcrel | DW_EH_PE_indirect))) && // GCC 4.7 linux<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">355 "Unexpected TTypeEncoding");<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">356 (void)ttypeEncoding;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">357<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">358 const uint8_t* ttypePtr = classInfo - ttypeIndex * sizeof(uintptr_t);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">359 return reinterpret_cast<const __shim_type_info *>(<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">360 read_target2_value(ttypePtr));<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">361 }<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">I do not known c++ exception very well, If I am correct the function get_shim_type_info will get shim_type_info from LSDA in elf section right??<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">If so, I wonder where the __shim_type_info constructed ? I guess, forget me if not correct: here just covert a memory in elf to a class ptr, maybe the vtable is not created for the ptr???
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">Do you have any idea about my case??<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">Thanks a lot~~<o:p></o:p></span></p>
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