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Is this expected to work? Attempt at minimal reproducer #18

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jjwilke opened this issue Jan 31, 2020 · 0 comments
Open

Is this expected to work? Attempt at minimal reproducer #18

jjwilke opened this issue Jan 31, 2020 · 0 comments

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@jjwilke
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jjwilke commented Jan 31, 2020

I know there are limitations currently. The code:

#include <string>
#include <iostream>

std::string name;

template <int x>
[[clang::jit]] void run(const char* str){
  name = std::string(str);
  std::cout << name << std::endl;
}

int main(int argc, char** argv)
{
  run<0>("hi there");
  return 0;
}

yields the following error:

include/c++/v1/string:2314:5: error: no
      matching member function for call to '__move_assign'
    __move_assign(__str, integral_constant<bool,
    ^~~~~~~~~~~~~
build/break.cc:8:8: note: in
      instantiation of member function 'std::__1::basic_string<char,
      std::__1::char_traits<char>, std::__1::allocator<char> >::operator=' requested here
  name = std::string(str);
       ^
build/break.cc:14:3: note: in
      instantiation of function template specialization 'run<0>' requested here
  run<0>("hi there");  
  ^
clang-jit/build/break.cc:14:3: note: in
      instantiation of function template specialization 'run<0>' requested here
include/c++/v1/string:1615:10: note: 
      candidate function not viable: no known conversion from 'integral_constant<[...],
      __alloc_traits::propagate_on_container_move_assignment::value aka true>' to
      'integral_constant<[...], (false) aka false>' for 2nd argument
    void __move_assign(basic_string& __str, false_type)
         ^
include/c++/v1/string:1618:10: note: 
      candidate function not viable: no known conversion from 'integral_constant<...>' to
      'integral_constant<...>' for 2nd argument
    void __move_assign(basic_string& __str, true_type)
         ^
LLVM ERROR: Clang JIT failed!
dutiona pushed a commit to dutiona/llvm-project-cxxjit that referenced this issue Dec 21, 2023
When `Target::GetEntryPointAddress()` calls `exe_module->GetObjectFile()->GetEntryPointAddress()`, and the returned
`entry_addr` is valid, it can immediately be returned.

However, just before that, an `llvm::Error` value has been setup, but in this case it is not consumed before returning, like is done further below in the function.

In https://bugs.freebsd.org/248745 we got a bug report for this, where a very simple test case aborts and dumps core:

```
* thread hfinkel#1, name = 'testcase', stop reason = breakpoint 1.1
    frame #0: 0x00000000002018d4 testcase`main(argc=1, argv=0x00007fffffffea18) at testcase.c:3:5
   1	int main(int argc, char *argv[])
   2	{
-> 3	    return 0;
   4	}
(lldb) p argc
Program aborted due to an unhandled Error:
Error value was Success. (Note: Success values must still be checked prior to being destroyed).

Thread 1 received signal SIGABRT, Aborted.
thr_kill () at thr_kill.S:3
3	thr_kill.S: No such file or directory.
(gdb) bt
#0  thr_kill () at thr_kill.S:3
hfinkel#1  0x00000008049a0004 in __raise (s=6) at /usr/src/lib/libc/gen/raise.c:52
hfinkel#2  0x0000000804916229 in abort () at /usr/src/lib/libc/stdlib/abort.c:67
hfinkel#3  0x000000000451b5f5 in fatalUncheckedError () at /usr/src/contrib/llvm-project/llvm/lib/Support/Error.cpp:112
hfinkel#4  0x00000000019cf008 in GetEntryPointAddress () at /usr/src/contrib/llvm-project/llvm/include/llvm/Support/Error.h:267
hfinkel#5  0x0000000001bccbd8 in ConstructorSetup () at /usr/src/contrib/llvm-project/lldb/source/Target/ThreadPlanCallFunction.cpp:67
hfinkel#6  0x0000000001bcd2c0 in ThreadPlanCallFunction () at /usr/src/contrib/llvm-project/lldb/source/Target/ThreadPlanCallFunction.cpp:114
hfinkel#7  0x00000000020076d4 in InferiorCallMmap () at /usr/src/contrib/llvm-project/lldb/source/Plugins/Process/Utility/InferiorCallPOSIX.cpp:97
hfinkel#8  0x0000000001f4be33 in DoAllocateMemory () at /usr/src/contrib/llvm-project/lldb/source/Plugins/Process/FreeBSD/ProcessFreeBSD.cpp:604
hfinkel#9  0x0000000001fe51b9 in AllocatePage () at /usr/src/contrib/llvm-project/lldb/source/Target/Memory.cpp:347
hfinkel#10 0x0000000001fe5385 in AllocateMemory () at /usr/src/contrib/llvm-project/lldb/source/Target/Memory.cpp:383
hfinkel#11 0x0000000001974da2 in AllocateMemory () at /usr/src/contrib/llvm-project/lldb/source/Target/Process.cpp:2301
hfinkel#12 CanJIT () at /usr/src/contrib/llvm-project/lldb/source/Target/Process.cpp:2331
hfinkel#13 0x0000000001a1bf3d in Evaluate () at /usr/src/contrib/llvm-project/lldb/source/Expression/UserExpression.cpp:190
hfinkel#14 0x00000000019ce7a2 in EvaluateExpression () at /usr/src/contrib/llvm-project/lldb/source/Target/Target.cpp:2372
hfinkel#15 0x0000000001ad784c in EvaluateExpression () at /usr/src/contrib/llvm-project/lldb/source/Commands/CommandObjectExpression.cpp:414
hfinkel#16 0x0000000001ad86ae in DoExecute () at /usr/src/contrib/llvm-project/lldb/source/Commands/CommandObjectExpression.cpp:646
hfinkel#17 0x0000000001a5e3ed in Execute () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandObject.cpp:1003
hfinkel#18 0x0000000001a6c4a3 in HandleCommand () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:1762
hfinkel#19 0x0000000001a6f98c in IOHandlerInputComplete () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:2760
hfinkel#20 0x0000000001a90b08 in Run () at /usr/src/contrib/llvm-project/lldb/source/Core/IOHandler.cpp:548
hfinkel#21 0x00000000019a6c6a in ExecuteIOHandlers () at /usr/src/contrib/llvm-project/lldb/source/Core/Debugger.cpp:903
hfinkel#22 0x0000000001a70337 in RunCommandInterpreter () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:2946
hfinkel#23 0x0000000001d9d812 in RunCommandInterpreter () at /usr/src/contrib/llvm-project/lldb/source/API/SBDebugger.cpp:1169
hfinkel#24 0x0000000001918be8 in MainLoop () at /usr/src/contrib/llvm-project/lldb/tools/driver/Driver.cpp:675
hfinkel#25 0x000000000191a114 in main () at /usr/src/contrib/llvm-project/lldb/tools/driver/Driver.cpp:890```

Fix the incorrect error catch by only instantiating an `Error` object if it is necessary.

Reviewed By: JDevlieghere

Differential Revision: https://reviews.llvm.org/D86355

(cherry picked from commit 1ce07cd)
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