1//===-- AArch64MCAsmInfo.cpp - AArch64 asm properties ---------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file contains the declarations of the AArch64MCAsmInfo properties. 11// 12//===----------------------------------------------------------------------===// 13 14#include "AArch64MCAsmInfo.h" 15#include "llvm/ADT/Triple.h" 16#include "llvm/MC/MCContext.h" 17#include "llvm/MC/MCExpr.h" 18#include "llvm/MC/MCStreamer.h" 19#include "llvm/Support/CommandLine.h" 20using namespace llvm; 21 22enum AsmWriterVariantTy { 23 Default = -1, 24 Generic = 0, 25 Apple = 1 26}; 27 28static cl::opt<AsmWriterVariantTy> AsmWriterVariant( 29 "aarch64-neon-syntax", cl::init(Default), 30 cl::desc("Choose style of NEON code to emit from AArch64 backend:"), 31 cl::values(clEnumValN(Generic, "generic", "Emit generic NEON assembly"), 32 clEnumValN(Apple, "apple", "Emit Apple-style NEON assembly"), 33 clEnumValEnd)); 34 35AArch64MCAsmInfoDarwin::AArch64MCAsmInfoDarwin() { 36 // We prefer NEON instructions to be printed in the short form. 37 AssemblerDialect = AsmWriterVariant == Default ? 1 : AsmWriterVariant; 38 39 PrivateGlobalPrefix = "L"; 40 PrivateLabelPrefix = "L"; 41 SeparatorString = "%%"; 42 CommentString = ";"; 43 PointerSize = CalleeSaveStackSlotSize = 8; 44 45 AlignmentIsInBytes = false; 46 UsesELFSectionDirectiveForBSS = true; 47 SupportsDebugInformation = true; 48 UseDataRegionDirectives = true; 49 50 ExceptionsType = ExceptionHandling::DwarfCFI; 51} 52 53const MCExpr *AArch64MCAsmInfoDarwin::getExprForPersonalitySymbol( 54 const MCSymbol *Sym, unsigned Encoding, MCStreamer &Streamer) const { 55 // On Darwin, we can reference dwarf symbols with foo@GOT-., which 56 // is an indirect pc-relative reference. The default implementation 57 // won't reference using the GOT, so we need this target-specific 58 // version. 59 MCContext &Context = Streamer.getContext(); 60 const MCExpr *Res = 61 MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_GOT, Context); 62 MCSymbol *PCSym = Context.CreateTempSymbol(); 63 Streamer.EmitLabel(PCSym); 64 const MCExpr *PC = MCSymbolRefExpr::Create(PCSym, Context); 65 return MCBinaryExpr::CreateSub(Res, PC, Context); 66} 67 68AArch64MCAsmInfoELF::AArch64MCAsmInfoELF(StringRef TT) { 69 Triple T(TT); 70 if (T.getArch() == Triple::aarch64_be) 71 IsLittleEndian = false; 72 73 // We prefer NEON instructions to be printed in the short form. 74 AssemblerDialect = AsmWriterVariant == Default ? 0 : AsmWriterVariant; 75 76 PointerSize = 8; 77 78 // ".comm align is in bytes but .align is pow-2." 79 AlignmentIsInBytes = false; 80 81 CommentString = "//"; 82 PrivateGlobalPrefix = ".L"; 83 PrivateLabelPrefix = ".L"; 84 Code32Directive = ".code\t32"; 85 86 Data16bitsDirective = "\t.hword\t"; 87 Data32bitsDirective = "\t.word\t"; 88 Data64bitsDirective = "\t.xword\t"; 89 90 UseDataRegionDirectives = false; 91 92 WeakRefDirective = "\t.weak\t"; 93 94 SupportsDebugInformation = true; 95 96 // Exceptions handling 97 ExceptionsType = ExceptionHandling::DwarfCFI; 98 99 UseIntegratedAssembler = true; 100 101 HasIdentDirective = true; 102} 103