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/MCSectionELF.h"
18 #include "llvm/Support/CommandLine.h"
21 enum AsmWriterFlavorTy {
22 // Note: This numbering has to match the GCC assembler dialects for inline
23 // asm alternatives to work right.
27 static cl::opt<AsmWriterFlavorTy>
28 AsmWriterFlavor("x86-asm-syntax", cl::init(ATT),
29 cl::desc("Choose style of code to emit from X86 backend:"),
30 cl::values(clEnumValN(ATT, "att", "Emit AT&T-style assembly"),
31 clEnumValN(Intel, "intel", "Emit Intel-style assembly"),
35 static const char *const x86_asm_table[] = {
47 X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &Triple) {
48 AsmTransCBE = x86_asm_table;
49 AssemblerDialect = AsmWriterFlavor;
51 bool is64Bit = Triple.getArch() == Triple::x86_64;
53 TextAlignFillValue = 0x90;
56 Data64bitsDirective = 0; // we can't emit a 64-bit unit
58 // Use ## as a comment string so that .s files generated by llvm can go
59 // through the GCC preprocessor without causing an error. This is needed
60 // because "clang foo.s" runs the C preprocessor, which is usually reserved
61 // for .S files on other systems. Perhaps this is because the file system
62 // wasn't always case preserving or something.
66 SupportsDebugInformation = true;
67 DwarfUsesInlineInfoSection = true;
69 // Exceptions handling
70 ExceptionsType = ExceptionHandling::Dwarf;
73 X86ELFMCAsmInfo::X86ELFMCAsmInfo(const Triple &T) {
74 AsmTransCBE = x86_asm_table;
75 AssemblerDialect = AsmWriterFlavor;
77 TextAlignFillValue = 0x90;
79 PrivateGlobalPrefix = ".L";
80 WeakRefDirective = "\t.weak\t";
83 // Set up DWARF directives
84 HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
87 AbsoluteDebugSectionOffsets = true;
88 SupportsDebugInformation = true;
90 // Exceptions handling
91 ExceptionsType = ExceptionHandling::Dwarf;
93 // OpenBSD has buggy support for .quad in 32-bit mode, just split into two
95 if (T.getOS() == Triple::OpenBSD && T.getArch() == Triple::x86)
96 Data64bitsDirective = 0;
99 MCSection *X86ELFMCAsmInfo::getNonexecutableStackSection(MCContext &Ctx) const {
100 return MCSectionELF::Create(".note.GNU-stack", MCSectionELF::SHT_PROGBITS,
101 0, SectionKind::getMetadata(), false, Ctx);
104 X86MCAsmInfoCOFF::X86MCAsmInfoCOFF(const Triple &Triple) {
105 AsmTransCBE = x86_asm_table;
106 AssemblerDialect = AsmWriterFlavor;
108 TextAlignFillValue = 0x90;