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 "X86TargetMachine.h"
16 #include "llvm/ADT/Triple.h"
17 #include "llvm/MC/MCContext.h"
18 #include "llvm/MC/MCExpr.h"
19 #include "llvm/MC/MCSectionELF.h"
20 #include "llvm/MC/MCStreamer.h"
21 #include "llvm/Support/CommandLine.h"
22 #include "llvm/Support/ELF.h"
25 enum AsmWriterFlavorTy {
26 // Note: This numbering has to match the GCC assembler dialects for inline
27 // asm alternatives to work right.
31 static cl::opt<AsmWriterFlavorTy>
32 AsmWriterFlavor("x86-asm-syntax", cl::init(ATT),
33 cl::desc("Choose style of code to emit from X86 backend:"),
34 cl::values(clEnumValN(ATT, "att", "Emit AT&T-style assembly"),
35 clEnumValN(Intel, "intel", "Emit Intel-style assembly"),
39 static const char *const x86_asm_table[] = {
51 X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &Triple) {
52 AsmTransCBE = x86_asm_table;
53 AssemblerDialect = AsmWriterFlavor;
55 bool is64Bit = Triple.getArch() == Triple::x86_64;
57 TextAlignFillValue = 0x90;
60 Data64bitsDirective = 0; // we can't emit a 64-bit unit
62 // Use ## as a comment string so that .s files generated by llvm can go
63 // through the GCC preprocessor without causing an error. This is needed
64 // because "clang foo.s" runs the C preprocessor, which is usually reserved
65 // for .S files on other systems. Perhaps this is because the file system
66 // wasn't always case preserving or something.
70 SupportsDebugInformation = true;
71 DwarfUsesInlineInfoSection = true;
73 // Exceptions handling
74 ExceptionsType = ExceptionHandling::DwarfCFI;
78 X86_64MCAsmInfoDarwin::getExprForPersonalitySymbol(const MCSymbol *Sym,
80 MCStreamer &Streamer) const {
81 MCContext &Context = Streamer.getContext();
83 MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_GOTPCREL, Context);
84 const MCExpr *Four = MCConstantExpr::Create(4, Context);
85 return MCBinaryExpr::CreateAdd(Res, Four, Context);
88 X86_64MCAsmInfoDarwin::X86_64MCAsmInfoDarwin(const Triple &Triple)
89 : X86MCAsmInfoDarwin(Triple) {
92 X86ELFMCAsmInfo::X86ELFMCAsmInfo(const Triple &T) {
93 AsmTransCBE = x86_asm_table;
94 AssemblerDialect = AsmWriterFlavor;
96 TextAlignFillValue = 0x90;
98 PrivateGlobalPrefix = ".L";
99 WeakRefDirective = "\t.weak\t";
102 // Set up DWARF directives
103 HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
106 SupportsDebugInformation = true;
108 // Exceptions handling
109 ExceptionsType = ExceptionHandling::DwarfCFI;
111 // OpenBSD has buggy support for .quad in 32-bit mode, just split into two
113 if (T.getOS() == Triple::OpenBSD && T.getArch() == Triple::x86)
114 Data64bitsDirective = 0;
117 const MCSection *X86ELFMCAsmInfo::
118 getNonexecutableStackSection(MCContext &Ctx) const {
119 return Ctx.getELFSection(".note.GNU-stack", ELF::SHT_PROGBITS,
120 0, SectionKind::getMetadata());
123 X86MCAsmInfoCOFF::X86MCAsmInfoCOFF(const Triple &Triple) {
124 if (Triple.getArch() == Triple::x86_64) {
126 PrivateGlobalPrefix = ".L";
129 AsmTransCBE = x86_asm_table;
130 AssemblerDialect = AsmWriterFlavor;
132 TextAlignFillValue = 0x90;