[LLVMdev] Regarding anonymous types

[Pankaj Gode]

Thanks for sharing the link. 
I had a similar link by chris, but it was a small text document. 
This link was helpful in understanding how the anonymous types, and specially the numbered types, are so represented.
 
Thanks & Regards,
Pankaj
 
 


________________________________
From: Devang Patel <dpatel at apple.com>
To: Pankaj Gode <godepankaj at yahoo.com> 
Cc: llvm Developers <llvmdev at cs.uiuc.edu> 
Sent: Wednesday, December 7, 2011 12:06 AM
Subject: Re: [LLVMdev] Regarding anonymous types


Pankaj, 

I encourage you to read Chris's excellent blog entry on type system @ http://blog.llvm.org/2011/11/llvm-30-type-system-rewrite.html
-
Devang


On Dec 6, 2011, at 3:54 AM, Pankaj Gode wrote:

Hi All,
> 
>While collecting type information for "anonymous types", I had below observation.
>
>For the example with anonymous types, given below
>struct test 
>{
>  struct {
>    union {
>      Char a[4];
>    };
>  };
>  struct {
>    int b;
>    char c;
>  };
>};
>
>LLVM 2.6 defines the types as 
>%struct.anon1 = type { %union.anon0}
>%struct.anon2 = type { i32, i8}
>%struct.test = type { %struct.anon1, %struct.anon2}
>%union.anon0 = type {[4 x i8]}
>
>Whereas, LLVM 2.9 defines the types as
>%0 = type { i32, i8}
>%anonanonct. = type {%anonanonn.}
>%anonanonn.  = type { [ 4x i8] }
>%struct.test = type { %anonanonct., %0}
>
>In case of LLVM2.9, "%0" is interesting case.  
>When I try to extract types using " Module_Ptr->getTypeSymbolTable()".
>for(TypeSymbolTable::const_iterator I = M->getTypeSymbolTable().begin(),
>      E = M->getTypeSymbolTable().end(); I != E; ++I) {
>   if( I->second->isStructTy() )
>   {
>     //code to collect type names
>   }      
>}
>
>I don't get this type in TypeSymbolTable.  :( 
>
>Though 
>struct{
> union {
>   char a[4];
> };
>};
>too is anonymous, but a name is given to it, i.e anonanonct. 
>
>I need this information as I want to collect all type-names. 
>
>
>Thanks & Regards,
>Pankaj
>
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