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"
20 using namespace llvm;
21
22 enum AsmWriterVariantTy {
23 Default = -1,
24 Generic = 0,
25 Apple = 1
26 };
27
28 static 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
AArch64MCAsmInfoDarwin()35 AArch64MCAsmInfoDarwin::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
getExprForPersonalitySymbol(const MCSymbol * Sym,unsigned Encoding,MCStreamer & Streamer) const53 const 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
AArch64MCAsmInfoELF(const Triple & T)68 AArch64MCAsmInfoELF::AArch64MCAsmInfoELF(const Triple &T) {
69 if (T.getArch() == Triple::aarch64_be)
70 IsLittleEndian = false;
71
72 // We prefer NEON instructions to be printed in the short form.
73 AssemblerDialect = AsmWriterVariant == Default ? 0 : AsmWriterVariant;
74
75 PointerSize = 8;
76
77 // ".comm align is in bytes but .align is pow-2."
78 AlignmentIsInBytes = false;
79
80 CommentString = "//";
81 PrivateGlobalPrefix = ".L";
82 PrivateLabelPrefix = ".L";
83 Code32Directive = ".code\t32";
84
85 Data16bitsDirective = "\t.hword\t";
86 Data32bitsDirective = "\t.word\t";
87 Data64bitsDirective = "\t.xword\t";
88
89 UseDataRegionDirectives = false;
90
91 WeakRefDirective = "\t.weak\t";
92
93 SupportsDebugInformation = true;
94
95 // Exceptions handling
96 ExceptionsType = ExceptionHandling::DwarfCFI;
97
98 UseIntegratedAssembler = true;
99
100 HasIdentDirective = true;
101 }
102