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//===-- AArch64MCAsmInfo.cpp - AArch64 asm properties ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the declarations of the AArch64MCAsmInfo properties.
//
//===----------------------------------------------------------------------===//
#include "AArch64MCAsmInfo.h"
#include "llvm/ADT/Triple.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Support/CommandLine.h"
using namespace llvm;
enum AsmWriterVariantTy {
Default = -1,
Generic = 0,
Apple = 1
};
static cl::opt<AsmWriterVariantTy> AsmWriterVariant(
"aarch64-neon-syntax", cl::init(Default),
cl::desc("Choose style of NEON code to emit from AArch64 backend:"),
cl::values(clEnumValN(Generic, "generic", "Emit generic NEON assembly"),
clEnumValN(Apple, "apple", "Emit Apple-style NEON assembly"),
clEnumValEnd));
AArch64MCAsmInfoDarwin::AArch64MCAsmInfoDarwin() {
// We prefer NEON instructions to be printed in the short form.
AssemblerDialect = AsmWriterVariant == Default ? 1 : AsmWriterVariant;
PrivateGlobalPrefix = "L";
SeparatorString = "%%";
CommentString = ";";
PointerSize = CalleeSaveStackSlotSize = 8;
AlignmentIsInBytes = false;
UsesELFSectionDirectiveForBSS = true;
SupportsDebugInformation = true;
UseDataRegionDirectives = true;
ExceptionsType = ExceptionHandling::DwarfCFI;
}
const MCExpr *AArch64MCAsmInfoDarwin::getExprForPersonalitySymbol(
const MCSymbol *Sym, unsigned Encoding, MCStreamer &Streamer) const {
// On Darwin, we can reference dwarf symbols with foo@GOT-., which
// is an indirect pc-relative reference. The default implementation
// won't reference using the GOT, so we need this target-specific
// version.
MCContext &Context = Streamer.getContext();
const MCExpr *Res =
MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_GOT, Context);
MCSymbol *PCSym = Context.CreateTempSymbol();
Streamer.EmitLabel(PCSym);
const MCExpr *PC = MCSymbolRefExpr::Create(PCSym, Context);
return MCBinaryExpr::CreateSub(Res, PC, Context);
}
AArch64MCAsmInfoELF::AArch64MCAsmInfoELF(StringRef TT) {
Triple T(TT);
if (T.getArch() == Triple::arm64_be || T.getArch() == Triple::aarch64_be)
IsLittleEndian = false;
// We prefer NEON instructions to be printed in the short form.
AssemblerDialect = AsmWriterVariant == Default ? 0 : AsmWriterVariant;
PointerSize = 8;
// ".comm align is in bytes but .align is pow-2."
AlignmentIsInBytes = false;
CommentString = "//";
PrivateGlobalPrefix = ".L";
Code32Directive = ".code\t32";
Data16bitsDirective = "\t.hword\t";
Data32bitsDirective = "\t.word\t";
Data64bitsDirective = "\t.xword\t";
UseDataRegionDirectives = false;
WeakRefDirective = "\t.weak\t";
HasLEB128 = true;
SupportsDebugInformation = true;
// Exceptions handling
ExceptionsType = ExceptionHandling::DwarfCFI;
UseIntegratedAssembler = true;
}
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