[LLVMdev] struct type parament

[Mehdi Amini]

Hi,

I think this is when a collision is found on the name.
I would be interesting to have the full test, it might be that the API is used in a way such that type is constantly re-created even if it already exists, which might be inefficient.

See in lib/IR/Type.cpp, StructType::setName(StringRef Name):

...
  // While we have a name collision, try a random rename.
  if (Entry->getValue()) {
    SmallString<64> TempStr(Name);
    TempStr.push_back('.');
    raw_svector_ostream TmpStream(TempStr);
    unsigned NameSize = Name.size();
   
    do {
      TempStr.resize(NameSize + 1);
      TmpStream.resync();
      TmpStream << getContext().pImpl->NamedStructTypesUniqueID++;
      
      Entry = &getContext().pImpl->
                 NamedStructTypes.GetOrCreateValue(TmpStream.str());
    } while (Entry->getValue());
  }


— 
Mehdi

> On Jun 2, 2015, at 11:23 AM, Haopeng Liu <hyliuhp at gmail.com> wrote:
> 
> Hi All,
> 
> I generated the following code with "clang -flto" command.
> 
> void test(struct StruTyName *a) {
>    ...
> }
> 
> Then the type of test function is "void (%struct.StruTyName.100*)" by calling function::getFunctionType API.
> 
> What's the meaning of number 100?
> 
> Best,
> Haopeng
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