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"
22 enum AsmWriterFlavorTy {
23 // Note: This numbering has to match the GCC assembler dialects for inline
24 // asm alternatives to work right.
28 static cl::opt<AsmWriterFlavorTy>
29 AsmWriterFlavor("x86-asm-syntax", cl::init(ATT),
30 cl::desc("Choose style of code to emit from X86 backend:"),
31 cl::values(clEnumValN(ATT, "att", "Emit AT&T-style assembly"),
32 clEnumValN(Intel, "intel", "Emit Intel-style assembly"),
36 static const char *const x86_asm_table[] = {
48 X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &Triple) {
49 AsmTransCBE = x86_asm_table;
50 AssemblerDialect = AsmWriterFlavor;
52 bool is64Bit = Triple.getArch() == Triple::x86_64;
54 TextAlignFillValue = 0x90;
57 Data64bitsDirective = 0; // we can't emit a 64-bit unit
59 // Use ## as a comment string so that .s files generated by llvm can go
60 // through the GCC preprocessor without causing an error. This is needed
61 // because "clang foo.s" runs the C preprocessor, which is usually reserved
62 // for .S files on other systems. Perhaps this is because the file system
63 // wasn't always case preserving or something.
67 SupportsDebugInformation = true;
68 DwarfUsesInlineInfoSection = true;
70 // Exceptions handling
71 ExceptionsType = ExceptionHandling::Dwarf;
74 X86ELFMCAsmInfo::X86ELFMCAsmInfo(const Triple &T) {
75 AsmTransCBE = x86_asm_table;
76 AssemblerDialect = AsmWriterFlavor;
78 TextAlignFillValue = 0x90;
80 PrivateGlobalPrefix = ".L";
81 WeakRefDirective = "\t.weak\t";
84 // Set up DWARF directives
85 HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
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 const MCSection *X86ELFMCAsmInfo::
100 getNonexecutableStackSection(MCContext &Ctx) const {
101 return Ctx.getELFSection(".note.GNU-stack", MCSectionELF::SHT_PROGBITS,
102 0, SectionKind::getMetadata());
105 X86MCAsmInfoCOFF::X86MCAsmInfoCOFF(const Triple &Triple) {
106 if (Triple.getArch() == Triple::x86_64) {
108 PrivateGlobalPrefix = ".L";
111 AsmTransCBE = x86_asm_table;
112 AssemblerDialect = AsmWriterFlavor;
114 TextAlignFillValue = 0x90;