lib/Target/DarwinTargetAsmInfo.cpp

//===-- DarwinTargetAsmInfo.cpp - Darwin asm properties ---------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines target asm properties related what form asm statements
// should take in general on Darwin-based targets
//
//===----------------------------------------------------------------------===//

#include "llvm/Target/DarwinTargetAsmInfo.h"
#include "llvm/ADT/Triple.h"
using namespace llvm;

DarwinTargetAsmInfo::DarwinTargetAsmInfo(const Triple &Triple) {
  // Common settings for all Darwin targets.
  // Syntax:
  GlobalPrefix = "_";
  PrivateGlobalPrefix = "L";
  LinkerPrivateGlobalPrefix = "l";  // Marker for some ObjC metadata
  NeedsSet = true;
  NeedsIndirectEncoding = true;
  AllowQuotesInName = true;
  HasSingleParameterDotFile = false;

  AlignmentIsInBytes = false;
  InlineAsmStart = " InlineAsm Start";
  InlineAsmEnd = " InlineAsm End";

  // In non-PIC modes, emit a special label before jump tables so that the
  // linker can perform more accurate dead code stripping.  We do not check the
  // relocation model here since it can be overridden later.
  JumpTableSpecialLabelPrefix = "l";
    
  // Directives:
  WeakDefDirective = "\t.weak_definition ";
  WeakRefDirective = "\t.weak_reference ";
  HiddenDirective = "\t.private_extern ";
  LCOMMDirective = "\t.lcomm\t";
  ZeroDirective = "\t.space\t";  // ".space N" emits N zeros.
  ZeroFillDirective = "\t.zerofill\t";  // Uses .zerofill
  SetDirective = "\t.set";
  ProtectedDirective = "\t.globl\t";
  HasDotTypeDotSizeDirective = false;
  UsedDirective = "\t.no_dead_strip\t";

  // On Leopard (10.5 aka darwin9) and earlier, _foo.eh symbols must be exported
  // so that the linker knows about them.  This is not necessary on 10.6 and
  // later, but it doesn't hurt anything.
  if (Triple.getDarwinMajorNumber() < 10)
    Is_EHSymbolPrivate = false;
  
  // Leopard (10.5 aka darwin9) and later support aligned common symbols.
  COMMDirectiveTakesAlignment = Triple.getDarwinMajorNumber() >= 9;
  
  GlobalEHDirective = "\t.globl\t";
  SupportsWeakOmittedEHFrame = false;
}