[LLVMdev] "UNREACHABLE executed!" error?

Alec Benzer alecbenzer at gmail.com
Sun Aug 15 14:04:31 PDT 2010


Tthe IRBuilder APIs for unions or unions in general? Either way, I was using
unions as a temporary solution for a problem I was too lazy to fully figure
out anyway.

On Sun, Aug 15, 2010 at 4:54 PM, Nick Lewycky <nicholas at mxc.ca> wrote:

> Alec Benzer wrote:
>
>> The dump from the function I'm running:
>>
>> define %object_structure @0() {
>> entry:
>>   ret %object_structure { i8 0, %object_union [double 5.000000e+00,
>> double false] }
>> }
>>
>
> Unions are almost entirely unimplemented. Sorry.
>
>  the only output I get after the runFunction() call is:
>>
>> UNREACHABLE executed!
>> Stack dump:
>> 0. Running pass 'X86 DAG->DAG Instruction Selection' on function '@0'
>>
>> I just noticed that my union seems to look like an array....is that
>> actually a union or do I have a problem somewhere? The code I use to
>> generate the union is:
>>
>> llvm::Constant* tempUnion =
>>
>> llvm::ConstantUnion::get(object_union_type,llvm::Constant::getNullValue(types[t]));
>>
>> llvm::Value* goodUnion =
>> builder.CreateInsertValue(tempUnion,data,t,"createuniontmp");
>>
>> object_union_type is union { double, i1 }, and (in this case) t is 0,
>> and types[t] is double
>>
>>
>> On Sun, Aug 15, 2010 at 4:13 PM, Eric Christopher <echristo at apple.com
>> <mailto:echristo at apple.com>> wrote:
>>
>>
>>    On Aug 15, 2010, at 1:06 PM, Alec Benzer wrote:
>>
>>     > What does this error mean? I'm getting it from an
>>    ExecutionEngine::runFunction() call. The function I'm passing it was
>>    run through verifyFunction() right before the runFunction() call. I
>>    can't seem to find anything that tells me what causes this, only
>>    specific (but seemingly unrelated to my problem) cases of it happening.
>>
>>    Which unreachable was it?  The basic idea is that whichever section
>>    of code gives that assertion shouldn't be executing.
>>
>>    Also, what was the .ll code that gave the assertion?
>>
>>    -eric
>>
>>
>>
>>
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>
>
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