1156230Smux//===- MCAsmInfo.cpp - Asm Info -------------------------------------------===// 2156230Smux// 3156230Smux// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4156230Smux// See https://llvm.org/LICENSE.txt for license information. 5156230Smux// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6156230Smux// 7156230Smux//===----------------------------------------------------------------------===// 8156230Smux// 9156230Smux// This file defines target asm properties related what form asm statements 10156230Smux// should take. 11156230Smux// 12156230Smux//===----------------------------------------------------------------------===// 13156230Smux 14156230Smux#include "llvm/MC/MCAsmInfo.h" 15156230Smux#include "llvm/BinaryFormat/Dwarf.h" 16156230Smux#include "llvm/MC/MCContext.h" 17156230Smux#include "llvm/MC/MCExpr.h" 18156230Smux#include "llvm/MC/MCStreamer.h" 19156230Smux#include "llvm/Support/CommandLine.h" 20156230Smux 21156230Smuxusing namespace llvm; 22156230Smux 23156230Smuxenum DefaultOnOff { Default, Enable, Disable }; 24156230Smuxstatic cl::opt<DefaultOnOff> DwarfExtendedLoc( 25156230Smux "dwarf-extended-loc", cl::Hidden, 26156230Smux cl::desc("Disable emission of the extended flags in .loc directives."), 27156230Smux cl::values(clEnumVal(Default, "Default for platform"), 28156230Smux clEnumVal(Enable, "Enabled"), clEnumVal(Disable, "Disabled")), 29156230Smux cl::init(Default)); 30156230Smux 31156230SmuxMCAsmInfo::MCAsmInfo() { 32156230Smux SeparatorString = ";"; 33156230Smux CommentString = "#"; 34156230Smux LabelSuffix = ":"; 35156230Smux PrivateGlobalPrefix = "L"; 36156230Smux PrivateLabelPrefix = PrivateGlobalPrefix; 37186781Slulf LinkerPrivateGlobalPrefix = ""; 38186781Slulf InlineAsmStart = "APP"; 39156230Smux InlineAsmEnd = "NO_APP"; 40156230Smux Code16Directive = ".code16"; 41156230Smux Code32Directive = ".code32"; 42186781Slulf Code64Directive = ".code64"; 43156230Smux ZeroDirective = "\t.zero\t"; 44156230Smux AsciiDirective = "\t.ascii\t"; 45156230Smux AscizDirective = "\t.asciz\t"; 46156230Smux Data8bitsDirective = "\t.byte\t"; 47156230Smux Data16bitsDirective = "\t.short\t"; 48156230Smux Data32bitsDirective = "\t.long\t"; 49156230Smux Data64bitsDirective = "\t.quad\t"; 50156230Smux GlobalDirective = "\t.globl\t"; 51156230Smux WeakDirective = "\t.weak\t"; 52156230Smux if (DwarfExtendedLoc != Default) 53186781Slulf SupportsExtendedDwarfLocDirective = DwarfExtendedLoc == Enable; 54186781Slulf 55186781Slulf // FIXME: Clang's logic should be synced with the logic used to initialize 56186781Slulf // this member and the two implementations should be merged. 57186781Slulf // For reference: 58156230Smux // - Solaris always enables the integrated assembler by default 59156230Smux // - SparcELFMCAsmInfo and X86ELFMCAsmInfo are handling this case 60156230Smux // - Windows always enables the integrated assembler by default 61156230Smux // - MCAsmInfoCOFF is handling this case, should it be MCAsmInfoMicrosoft? 62186781Slulf // - MachO targets always enables the integrated assembler by default 63156230Smux // - MCAsmInfoDarwin is handling this case 64156230Smux // - Generic_GCC toolchains enable the integrated assembler on a per 65156230Smux // architecture basis. 66186781Slulf // - The target subclasses for AArch64, ARM, and X86 handle these cases 67156230Smux UseIntegratedAssembler = false; 68156230Smux PreserveAsmComments = true; 69156230Smux} 70156230Smux 71156230SmuxMCAsmInfo::~MCAsmInfo() = default; 72156230Smux 73156230Smuxvoid MCAsmInfo::addInitialFrameState(const MCCFIInstruction &Inst) { 74186781Slulf InitialFrameState.push_back(Inst); 75156230Smux} 76156230Smux 77156230Smuxbool MCAsmInfo::isSectionAtomizableBySymbols(const MCSection &Section) const { 78156230Smux return false; 79156230Smux} 80156230Smux 81156230Smuxconst MCExpr * 82186781SlulfMCAsmInfo::getExprForPersonalitySymbol(const MCSymbol *Sym, 83186781Slulf unsigned Encoding, 84156230Smux MCStreamer &Streamer) const { 85 return getExprForFDESymbol(Sym, Encoding, Streamer); 86} 87 88const MCExpr * 89MCAsmInfo::getExprForFDESymbol(const MCSymbol *Sym, 90 unsigned Encoding, 91 MCStreamer &Streamer) const { 92 if (!(Encoding & dwarf::DW_EH_PE_pcrel)) 93 return MCSymbolRefExpr::create(Sym, Streamer.getContext()); 94 95 MCContext &Context = Streamer.getContext(); 96 const MCExpr *Res = MCSymbolRefExpr::create(Sym, Context); 97 MCSymbol *PCSym = Context.createTempSymbol(); 98 Streamer.EmitLabel(PCSym); 99 const MCExpr *PC = MCSymbolRefExpr::create(PCSym, Context); 100 return MCBinaryExpr::createSub(Res, PC, Context); 101} 102 103bool MCAsmInfo::isAcceptableChar(char C) const { 104 return (C >= 'a' && C <= 'z') || (C >= 'A' && C <= 'Z') || 105 (C >= '0' && C <= '9') || C == '_' || C == '$' || C == '.' || C == '@'; 106} 107 108bool MCAsmInfo::isValidUnquotedName(StringRef Name) const { 109 if (Name.empty()) 110 return false; 111 112 // If any of the characters in the string is an unacceptable character, force 113 // quotes. 114 for (char C : Name) { 115 if (!isAcceptableChar(C)) 116 return false; 117 } 118 119 return true; 120} 121 122bool MCAsmInfo::shouldOmitSectionDirective(StringRef SectionName) const { 123 // FIXME: Does .section .bss/.data/.text work everywhere?? 124 return SectionName == ".text" || SectionName == ".data" || 125 (SectionName == ".bss" && !usesELFSectionDirectiveForBSS()); 126} 127