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Tim Northover3b0846e2014-05-24 12:50:23 +00001//===-- 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"
Daniel Sanders50f17232015-09-15 16:17:27 +000015#include "llvm/ADT/Triple.h"
Tim Northover3b0846e2014-05-24 12:50:23 +000016#include "llvm/MC/MCContext.h"
Benjamin Kramer1f8930e2014-07-25 11:42:14 +000017#include "llvm/MC/MCExpr.h"
Tim Northover3b0846e2014-05-24 12:50:23 +000018#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"),
Mehdi Amini732afdd2016-10-08 19:41:06 +000032 clEnumValN(Apple, "apple", "Emit Apple-style NEON assembly")));
Tim Northover3b0846e2014-05-24 12:50:23 +000033
34AArch64MCAsmInfoDarwin::AArch64MCAsmInfoDarwin() {
35 // We prefer NEON instructions to be printed in the short form.
36 AssemblerDialect = AsmWriterVariant == Default ? 1 : AsmWriterVariant;
37
38 PrivateGlobalPrefix = "L";
Matt Arsenault4e273432014-12-04 00:06:57 +000039 PrivateLabelPrefix = "L";
Tim Northover3b0846e2014-05-24 12:50:23 +000040 SeparatorString = "%%";
41 CommentString = ";";
42 PointerSize = CalleeSaveStackSlotSize = 8;
43
44 AlignmentIsInBytes = false;
45 UsesELFSectionDirectiveForBSS = true;
46 SupportsDebugInformation = true;
47 UseDataRegionDirectives = true;
48
49 ExceptionsType = ExceptionHandling::DwarfCFI;
50}
51
52const MCExpr *AArch64MCAsmInfoDarwin::getExprForPersonalitySymbol(
53 const MCSymbol *Sym, unsigned Encoding, MCStreamer &Streamer) const {
54 // On Darwin, we can reference dwarf symbols with foo@GOT-., which
55 // is an indirect pc-relative reference. The default implementation
56 // won't reference using the GOT, so we need this target-specific
57 // version.
58 MCContext &Context = Streamer.getContext();
59 const MCExpr *Res =
Jim Grosbach13760bd2015-05-30 01:25:56 +000060 MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOT, Context);
Jim Grosbach6f482002015-05-18 18:43:14 +000061 MCSymbol *PCSym = Context.createTempSymbol();
Tim Northover3b0846e2014-05-24 12:50:23 +000062 Streamer.EmitLabel(PCSym);
Jim Grosbach13760bd2015-05-30 01:25:56 +000063 const MCExpr *PC = MCSymbolRefExpr::create(PCSym, Context);
64 return MCBinaryExpr::createSub(Res, PC, Context);
Tim Northover3b0846e2014-05-24 12:50:23 +000065}
66
Daniel Sanders50f17232015-09-15 16:17:27 +000067AArch64MCAsmInfoELF::AArch64MCAsmInfoELF(const Triple &T) {
68 if (T.getArch() == Triple::aarch64_be)
Tim Northover3b0846e2014-05-24 12:50:23 +000069 IsLittleEndian = false;
70
71 // We prefer NEON instructions to be printed in the short form.
72 AssemblerDialect = AsmWriterVariant == Default ? 0 : AsmWriterVariant;
73
74 PointerSize = 8;
75
76 // ".comm align is in bytes but .align is pow-2."
77 AlignmentIsInBytes = false;
78
79 CommentString = "//";
80 PrivateGlobalPrefix = ".L";
Matt Arsenault4e273432014-12-04 00:06:57 +000081 PrivateLabelPrefix = ".L";
Tim Northover3b0846e2014-05-24 12:50:23 +000082 Code32Directive = ".code\t32";
83
84 Data16bitsDirective = "\t.hword\t";
85 Data32bitsDirective = "\t.word\t";
86 Data64bitsDirective = "\t.xword\t";
87
88 UseDataRegionDirectives = false;
89
90 WeakRefDirective = "\t.weak\t";
91
Tim Northover3b0846e2014-05-24 12:50:23 +000092 SupportsDebugInformation = true;
93
94 // Exceptions handling
95 ExceptionsType = ExceptionHandling::DwarfCFI;
96
97 UseIntegratedAssembler = true;
Chad Rosierd863ae32014-06-10 14:32:08 +000098
99 HasIdentDirective = true;
Tim Northover3b0846e2014-05-24 12:50:23 +0000100}