1 //===-- X86MCAsmInfo.cpp - X86 asm properties -----------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the declarations of the X86MCAsmInfo properties.
12 //===----------------------------------------------------------------------===//
14 #include "X86MCAsmInfo.h"
15 #include "llvm/ADT/Triple.h"
16 #include "llvm/MC/MCContext.h"
17 #include "llvm/MC/MCExpr.h"
18 #include "llvm/MC/MCSectionELF.h"
19 #include "llvm/MC/MCStreamer.h"
20 #include "llvm/Support/CommandLine.h"
21 #include "llvm/Support/ELF.h"
24 enum AsmWriterFlavorTy {
25 // Note: This numbering has to match the GCC assembler dialects for inline
26 // asm alternatives to work right.
30 static cl::opt<AsmWriterFlavorTy>
31 AsmWriterFlavor("x86-asm-syntax", cl::init(ATT),
32 cl::desc("Choose style of code to emit from X86 backend:"),
33 cl::values(clEnumValN(ATT, "att", "Emit AT&T-style assembly"),
34 clEnumValN(Intel, "intel", "Emit Intel-style assembly"),
38 static const char *const x86_asm_table[] = {
51 void X86MCAsmInfoDarwin::anchor() { }
53 X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &T) {
54 bool is64Bit = T.getArch() == Triple::x86_64;
58 AsmTransCBE = x86_asm_table;
59 AssemblerDialect = AsmWriterFlavor;
61 TextAlignFillValue = 0x90;
64 Data64bitsDirective = 0; // we can't emit a 64-bit unit
66 // Use ## as a comment string so that .s files generated by llvm can go
67 // through the GCC preprocessor without causing an error. This is needed
68 // because "clang foo.s" runs the C preprocessor, which is usually reserved
69 // for .S files on other systems. Perhaps this is because the file system
70 // wasn't always case preserving or something.
74 SupportsDebugInformation = true;
75 DwarfUsesInlineInfoSection = true;
77 // Exceptions handling
78 ExceptionsType = ExceptionHandling::DwarfCFI;
81 X86_64MCAsmInfoDarwin::X86_64MCAsmInfoDarwin(const Triple &Triple)
82 : X86MCAsmInfoDarwin(Triple) {
85 void X86ELFMCAsmInfo::anchor() { }
87 X86ELFMCAsmInfo::X86ELFMCAsmInfo(const Triple &T) {
88 if (T.getArch() == Triple::x86_64)
91 AsmTransCBE = x86_asm_table;
92 AssemblerDialect = AsmWriterFlavor;
94 TextAlignFillValue = 0x90;
96 PrivateGlobalPrefix = ".L";
97 WeakRefDirective = "\t.weak\t";
100 // Set up DWARF directives
101 HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
104 SupportsDebugInformation = true;
106 // Exceptions handling
107 ExceptionsType = ExceptionHandling::DwarfCFI;
109 // OpenBSD has buggy support for .quad in 32-bit mode, just split into two
111 if (T.getOS() == Triple::OpenBSD && T.getArch() == Triple::x86)
112 Data64bitsDirective = 0;
116 X86_64MCAsmInfoDarwin::getExprForPersonalitySymbol(const MCSymbol *Sym,
118 MCStreamer &Streamer) const {
119 MCContext &Context = Streamer.getContext();
121 MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_GOTPCREL, Context);
122 const MCExpr *Four = MCConstantExpr::Create(4, Context);
123 return MCBinaryExpr::CreateAdd(Res, Four, Context);
126 const MCSection *X86ELFMCAsmInfo::
127 getNonexecutableStackSection(MCContext &Ctx) const {
128 return Ctx.getELFSection(".note.GNU-stack", ELF::SHT_PROGBITS,
129 0, SectionKind::getMetadata());
132 void X86MCAsmInfoMicrosoft::anchor() { }
134 X86MCAsmInfoMicrosoft::X86MCAsmInfoMicrosoft(const Triple &Triple) {
135 if (Triple.getArch() == Triple::x86_64) {
137 PrivateGlobalPrefix = ".L";
140 AsmTransCBE = x86_asm_table;
141 AssemblerDialect = AsmWriterFlavor;
143 TextAlignFillValue = 0x90;
146 void X86MCAsmInfoGNUCOFF::anchor() { }
148 X86MCAsmInfoGNUCOFF::X86MCAsmInfoGNUCOFF(const Triple &Triple) {
149 if (Triple.getArch() == Triple::x86_64) {
151 PrivateGlobalPrefix = ".L";
154 AsmTransCBE = x86_asm_table;
155 AssemblerDialect = AsmWriterFlavor;
157 TextAlignFillValue = 0x90;