Lajos Vétek via llvm-dev
2018-Jun-10 07:01 UTC
[llvm-dev] Kaleidoscope Tutorial Chapter #4: externs crash REPL
Hi,
I am working myself through the LLVM Kaleidoscope tutorials, with a current
(git master) llvm build on a Mac OS X 10.13.5. I must say the tutorial is
realy a good read, and it is great fun to work through the examples...
Up until Chapter 4 everything was working as expected, but in Chapter 4 I
ran into some issues. I cannot get the extern (dlsym-d) function to work in
another function.
Declaring the external prototype and using it as a top level expression
works:
ready> extern sin(a);
ready> Read extern:
declare double @sin(double)
ready> sin(1);
ready> Evaluated to 0.841471
Unfortunatly as soon as the external function is used in another def-d
function body, the REPL crashes:
ready> def test(b) sin(b);
ready> Read function definition:
define double @test(double %b) {
entry:
%calltmp = call double @sin(double %b)
ret double %calltmp
}
ready> test(1);
ready> Failure value returned from cantFail wrapped call
UNREACHABLE executed at
/Users/lui/Work/llvm/include/llvm/Support/Error.h:716!
Process 46951 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = signal
SIGABRT
frame #0: 0x00007fff5d3bab6e libsystem_kernel.dylib`__pthread_kill + 10
libsystem_kernel.dylib`__pthread_kill:
-> 0x7fff5d3bab6e <+10>: jae 0x7fff5d3bab78 ;
<+20>
0x7fff5d3bab70 <+12>: movq %rax, %rdi
0x7fff5d3bab73 <+15>: jmp 0x7fff5d3b1b00 ;
cerror_nocancel
0x7fff5d3bab78 <+20>: retq
Target 0: (Kaleidoscope-Ch4) stopped.
(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = signal
SIGABRT
* frame #0: 0x00007fff5d3bab6e libsystem_kernel.dylib`__pthread_kill + 10
frame #1: 0x00007fff5d585080 libsystem_pthread.dylib`pthread_kill + 333
frame #2: 0x00007fff5d3161ae libsystem_c.dylib`abort + 127
frame #3: 0x0000000100c28ee0
Kaleidoscope-Ch4`llvm::llvm_unreachable_internal(msg="Failure value
returned from cantFail wrapped call",
file="/Users/lui/Work/llvm/include/llvm/Support/Error.h", line=716) at
ErrorHandling.cpp:222
frame #4: 0x0000000100031967 Kaleidoscope-Ch4`unsigned long long
llvm::cantFail<unsigned long long>(ValOrErr=<unavailable>,
Msg="Failure
value returned from cantFail wrapped call") at Error.h:716
frame #5: 0x0000000100008e5d
Kaleidoscope-Ch4`HandleTopLevelExpression() at toy.cpp:615
frame #6: 0x0000000100003b73 Kaleidoscope-Ch4`MainLoop() at toy.cpp:644
frame #7: 0x0000000100002ee5 Kaleidoscope-Ch4`main at toy.cpp:697
frame #8: 0x00007fff5d26a015 libdyld.dylib`start + 1
frame #9: 0x00007fff5d26a015 libdyld.dylib`start + 1
(lldb)
Is it something related to OS X? Or is there something known in git master
that temporary disabled the dynamic loading of extern functions?
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Lajos Vétek via llvm-dev
2018-Jun-12 17:58 UTC
[llvm-dev] Kaleidoscope Tutorial Chapter #4: externs crash REPL
This seems to be a regression. With the release_60 branch, the extern functions work just fine. With the master, it still crashes... Is it a known bug? Is it worth to file a bugreport.. Cheers, Lajos Lajos Vétek <lajos.vetek at gmail.com> ezt írta (időpont: 2018. jún. 10., V, 9:01):> Hi, > > I am working myself through the LLVM Kaleidoscope tutorials, with a > current (git master) llvm build on a Mac OS X 10.13.5. I must say the > tutorial is realy a good read, and it is great fun to work through the > examples... > Up until Chapter 4 everything was working as expected, but in Chapter 4 I > ran into some issues. I cannot get the extern (dlsym-d) function to work in > another function. > Declaring the external prototype and using it as a top level expression > works: > > ready> extern sin(a); > > ready> Read extern: > > declare double @sin(double) > > > ready> sin(1); > > ready> Evaluated to 0.841471 > > Unfortunatly as soon as the external function is used in another def-d > function body, the REPL crashes: > > ready> def test(b) sin(b); > > ready> Read function definition: > > define double @test(double %b) { > > entry: > > %calltmp = call double @sin(double %b) > > ret double %calltmp > > } > > > ready> test(1); > > ready> Failure value returned from cantFail wrapped call > > UNREACHABLE executed at > /Users/lui/Work/llvm/include/llvm/Support/Error.h:716! > > Process 46951 stopped > > * thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT > > frame #0: 0x00007fff5d3bab6e libsystem_kernel.dylib`__pthread_kill + 10 > > libsystem_kernel.dylib`__pthread_kill: > > -> 0x7fff5d3bab6e <+10>: jae 0x7fff5d3bab78 ; <+20> > > 0x7fff5d3bab70 <+12>: movq %rax, %rdi > > 0x7fff5d3bab73 <+15>: jmp 0x7fff5d3b1b00 ; > cerror_nocancel > > 0x7fff5d3bab78 <+20>: retq > > Target 0: (Kaleidoscope-Ch4) stopped. > > (lldb) bt > > * thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT > > * frame #0: 0x00007fff5d3bab6e libsystem_kernel.dylib`__pthread_kill + 10 > > frame #1: 0x00007fff5d585080 libsystem_pthread.dylib`pthread_kill + 333 > > frame #2: 0x00007fff5d3161ae libsystem_c.dylib`abort + 127 > > frame #3: 0x0000000100c28ee0 > Kaleidoscope-Ch4`llvm::llvm_unreachable_internal(msg="Failure value > returned from cantFail wrapped call", > file="/Users/lui/Work/llvm/include/llvm/Support/Error.h", line=716) at > ErrorHandling.cpp:222 > > frame #4: 0x0000000100031967 Kaleidoscope-Ch4`unsigned long long > llvm::cantFail<unsigned long long>(ValOrErr=<unavailable>, Msg="Failure > value returned from cantFail wrapped call") at Error.h:716 > > frame #5: 0x0000000100008e5d > Kaleidoscope-Ch4`HandleTopLevelExpression() at toy.cpp:615 > > frame #6: 0x0000000100003b73 Kaleidoscope-Ch4`MainLoop() at toy.cpp:644 > > frame #7: 0x0000000100002ee5 Kaleidoscope-Ch4`main at toy.cpp:697 > > frame #8: 0x00007fff5d26a015 libdyld.dylib`start + 1 > > frame #9: 0x00007fff5d26a015 libdyld.dylib`start + 1 > > (lldb) > > Is it something related to OS X? Or is there something known in git master > that temporary disabled the dynamic loading of extern functions? >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20180612/7e07aa69/attachment.html>