lib/Target/ARM/MCTargetDesc/ARMMCAsmInfo.cpp

   1 //===-- ARMMCAsmInfo.cpp - ARM asm properties -----------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file contains the declarations of the ARMMCAsmInfo properties.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "ARMMCAsmInfo.h"
  14 #include "llvm/ADT/Triple.h"
  15
  16 using namespace llvm;
  17
  18 void ARMMCAsmInfoDarwin::anchor() { }
  19
  20 ARMMCAsmInfoDarwin::ARMMCAsmInfoDarwin(const Triple &TheTriple) {
  21   if ((TheTriple.getArch() == Triple::armeb) ||
  22       (TheTriple.getArch() == Triple::thumbeb))
  23     IsLittleEndian = false;
  24
  25   Data64bitsDirective = nullptr;
  26   CommentString = "@";
  27   Code16Directive = ".code\t16";
  28   Code32Directive = ".code\t32";
  29   UseDataRegionDirectives = true;
  30
  31   SupportsDebugInformation = true;
  32
  33   // Conditional Thumb 4-byte instructions can have an implicit IT.
  34   MaxInstLength = 6;
  35
  36   // Exceptions handling
  37   ExceptionsType = (TheTriple.isOSDarwin() && !TheTriple.isWatchABI())
  38                        ? ExceptionHandling::SjLj
  39                        : ExceptionHandling::DwarfCFI;
  40
  41   UseIntegratedAssembler = true;
  42 }
  43
  44 void ARMELFMCAsmInfo::anchor() { }
  45
  46 ARMELFMCAsmInfo::ARMELFMCAsmInfo(const Triple &TheTriple) {
  47   if ((TheTriple.getArch() == Triple::armeb) ||
  48       (TheTriple.getArch() == Triple::thumbeb))
  49     IsLittleEndian = false;
  50
  51   // ".comm align is in bytes but .align is pow-2."
  52   AlignmentIsInBytes = false;
  53
  54   Data64bitsDirective = nullptr;
  55   CommentString = "@";
  56   Code16Directive = ".code\t16";
  57   Code32Directive = ".code\t32";
  58
  59   SupportsDebugInformation = true;
  60
  61   // Conditional Thumb 4-byte instructions can have an implicit IT.
  62   MaxInstLength = 6;
  63
  64   // Exceptions handling
  65   switch (TheTriple.getOS()) {
  66   case Triple::NetBSD:
  67     ExceptionsType = ExceptionHandling::DwarfCFI;
  68     break;
  69   default:
  70     ExceptionsType = ExceptionHandling::ARM;
  71     break;
  72   }
  73
  74   // foo(plt) instead of foo@plt
  75   UseParensForSymbolVariant = true;
  76
  77   UseIntegratedAssembler = true;
  78 }
  79
  80 void ARMELFMCAsmInfo::setUseIntegratedAssembler(bool Value) {
  81   UseIntegratedAssembler = Value;
  82   if (!UseIntegratedAssembler) {
  83     // gas doesn't handle VFP register names in cfi directives,
  84     // so don't use register names with external assembler.
  85     // See https://sourceware.org/bugzilla/show_bug.cgi?id=16694
  86     DwarfRegNumForCFI = true;
  87   }
  88 }
  89
  90 void ARMCOFFMCAsmInfoMicrosoft::anchor() { }
  91
  92 ARMCOFFMCAsmInfoMicrosoft::ARMCOFFMCAsmInfoMicrosoft() {
  93   AlignmentIsInBytes = false;
  94   ExceptionsType = ExceptionHandling::WinEH;
  95   PrivateGlobalPrefix = "$M";
  96   PrivateLabelPrefix = "$M";
  97   CommentString = ";";
  98
  99   // Conditional Thumb 4-byte instructions can have an implicit IT.
 100   MaxInstLength = 6;
 101 }
 102
 103 void ARMCOFFMCAsmInfoGNU::anchor() { }
 104
 105 ARMCOFFMCAsmInfoGNU::ARMCOFFMCAsmInfoGNU() {
 106   AlignmentIsInBytes = false;
 107   HasSingleParameterDotFile = true;
 108
 109   CommentString = "@";
 110   Code16Directive = ".code\t16";
 111   Code32Directive = ".code\t32";
 112   PrivateGlobalPrefix = ".L";
 113   PrivateLabelPrefix = ".L";
 114
 115   SupportsDebugInformation = true;
 116   ExceptionsType = ExceptionHandling::DwarfCFI;
 117   UseParensForSymbolVariant = true;
 118
 119   UseIntegratedAssembler = true;
 120   DwarfRegNumForCFI = false;
 121
 122   // Conditional Thumb 4-byte instructions can have an implicit IT.
 123   MaxInstLength = 6;
 124 }