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/MCSectionELF.h"
19 #include "llvm/Support/CommandLine.h"
20 #include "llvm/Support/ELF.h"
23 enum AsmWriterFlavorTy {
24 // Note: This numbering has to match the GCC assembler dialects for inline
25 // asm alternatives to work right.
29 static cl::opt<AsmWriterFlavorTy>
30 AsmWriterFlavor("x86-asm-syntax", cl::init(ATT),
31 cl::desc("Choose style of code to emit from X86 backend:"),
32 cl::values(clEnumValN(ATT, "att", "Emit AT&T-style assembly"),
33 clEnumValN(Intel, "intel", "Emit Intel-style assembly"),
37 static const char *const x86_asm_table[] = {
49 X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &Triple) {
50 AsmTransCBE = x86_asm_table;
51 AssemblerDialect = AsmWriterFlavor;
53 bool is64Bit = Triple.getArch() == Triple::x86_64;
55 TextAlignFillValue = 0x90;
58 Data64bitsDirective = 0; // we can't emit a 64-bit unit
60 // Use ## as a comment string so that .s files generated by llvm can go
61 // through the GCC preprocessor without causing an error. This is needed
62 // because "clang foo.s" runs the C preprocessor, which is usually reserved
63 // for .S files on other systems. Perhaps this is because the file system
64 // wasn't always case preserving or something.
68 SupportsDebugInformation = true;
69 DwarfUsesInlineInfoSection = true;
71 // Exceptions handling
72 ExceptionsType = ExceptionHandling::DwarfTable;
75 X86ELFMCAsmInfo::X86ELFMCAsmInfo(const Triple &T) {
76 AsmTransCBE = x86_asm_table;
77 AssemblerDialect = AsmWriterFlavor;
79 TextAlignFillValue = 0x90;
81 PrivateGlobalPrefix = ".L";
82 WeakRefDirective = "\t.weak\t";
85 // Set up DWARF directives
86 HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
89 SupportsDebugInformation = true;
91 // Exceptions handling
92 ExceptionsType = ExceptionHandling::DwarfCFI;
94 DwarfRequiresFrameSection = false;
96 // OpenBSD has buggy support for .quad in 32-bit mode, just split into two
98 if (T.getOS() == Triple::OpenBSD && T.getArch() == Triple::x86)
99 Data64bitsDirective = 0;
102 const MCSection *X86ELFMCAsmInfo::
103 getNonexecutableStackSection(MCContext &Ctx) const {
104 return Ctx.getELFSection(".note.GNU-stack", ELF::SHT_PROGBITS,
105 0, SectionKind::getMetadata());
108 X86MCAsmInfoCOFF::X86MCAsmInfoCOFF(const Triple &Triple) {
109 if (Triple.getArch() == Triple::x86_64) {
111 PrivateGlobalPrefix = ".L";
114 AsmTransCBE = x86_asm_table;
115 AssemblerDialect = AsmWriterFlavor;
117 TextAlignFillValue = 0x90;