[LLVMdev] Contants generation - proposal

[Demikhovsky, Elena]

All compilers do this, gcc, for example
#include <stdio.h>

const char A[] = {"Hello, world"};

int main() {
  printf("%s\n", A);
  return 0;
}

gcc hello.c -o hello

objdump --all hello | grep -w A
00000000004005d8 g     O .rodata        000000000000000d              A

-  Elena


-----Original Message-----
From: Tim Northover [mailto:t.p.northover at gmail.com] 
Sent: Wednesday, June 26, 2013 14:23
To: Demikhovsky, Elena
Cc: llvmdev at cs.uiuc.edu
Subject: Re: [LLVMdev] Contants generation - proposal

>> I think that the improved behavior for consts should be acceptable in the large model. But that's just me.

> By default, all constants should be in a special read-only section, and this section may be far from the text section.

Why should they? The only reason I can think of is to support execute-only pages, but isn't that the less common use-case? From what I could tell from a quick search (very non-thorough), none of the mainstream x86 operating systems enable it by default.

Cheers.

Tim.
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