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134 lines
4.0 KiB
C++
134 lines
4.0 KiB
C++
//===-- X86MCAsmInfo.cpp - X86 asm properties -----------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the declarations of the X86MCAsmInfo properties.
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//
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//===----------------------------------------------------------------------===//
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#include "X86MCAsmInfo.h"
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#include "X86TargetMachine.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCSectionELF.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ELF.h"
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using namespace llvm;
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enum AsmWriterFlavorTy {
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// Note: This numbering has to match the GCC assembler dialects for inline
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// asm alternatives to work right.
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ATT = 0, Intel = 1
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};
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static cl::opt<AsmWriterFlavorTy>
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AsmWriterFlavor("x86-asm-syntax", cl::init(ATT),
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cl::desc("Choose style of code to emit from X86 backend:"),
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cl::values(clEnumValN(ATT, "att", "Emit AT&T-style assembly"),
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clEnumValN(Intel, "intel", "Emit Intel-style assembly"),
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clEnumValEnd));
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static const char *const x86_asm_table[] = {
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"{si}", "S",
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"{di}", "D",
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"{ax}", "a",
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"{cx}", "c",
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"{memory}", "memory",
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"{flags}", "",
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"{dirflag}", "",
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"{fpsr}", "",
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"{cc}", "cc",
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0,0};
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X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &Triple) {
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AsmTransCBE = x86_asm_table;
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AssemblerDialect = AsmWriterFlavor;
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bool is64Bit = Triple.getArch() == Triple::x86_64;
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TextAlignFillValue = 0x90;
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if (!is64Bit)
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Data64bitsDirective = 0; // we can't emit a 64-bit unit
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// Use ## as a comment string so that .s files generated by llvm can go
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// through the GCC preprocessor without causing an error. This is needed
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// because "clang foo.s" runs the C preprocessor, which is usually reserved
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// for .S files on other systems. Perhaps this is because the file system
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// wasn't always case preserving or something.
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CommentString = "##";
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PCSymbol = ".";
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SupportsDebugInformation = true;
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DwarfUsesInlineInfoSection = true;
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// Exceptions handling
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ExceptionsType = ExceptionHandling::DwarfCFI;
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}
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const MCExpr *
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X86_64MCAsmInfoDarwin::getExprForPersonalitySymbol(const MCSymbol *Sym,
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unsigned Encoding,
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MCStreamer &Streamer) const {
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MCContext &Context = Streamer.getContext();
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const MCExpr *Res =
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MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_GOTPCREL, Context);
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const MCExpr *Four = MCConstantExpr::Create(4, Context);
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return MCBinaryExpr::CreateAdd(Res, Four, Context);
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}
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X86_64MCAsmInfoDarwin::X86_64MCAsmInfoDarwin(const Triple &Triple)
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: X86MCAsmInfoDarwin(Triple) {
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}
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X86ELFMCAsmInfo::X86ELFMCAsmInfo(const Triple &T) {
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AsmTransCBE = x86_asm_table;
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AssemblerDialect = AsmWriterFlavor;
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TextAlignFillValue = 0x90;
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PrivateGlobalPrefix = ".L";
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WeakRefDirective = "\t.weak\t";
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PCSymbol = ".";
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// Set up DWARF directives
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HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
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// Debug Information
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SupportsDebugInformation = true;
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// Exceptions handling
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ExceptionsType = ExceptionHandling::DwarfCFI;
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// OpenBSD has buggy support for .quad in 32-bit mode, just split into two
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// .words.
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if (T.getOS() == Triple::OpenBSD && T.getArch() == Triple::x86)
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Data64bitsDirective = 0;
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}
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const MCSection *X86ELFMCAsmInfo::
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getNonexecutableStackSection(MCContext &Ctx) const {
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return Ctx.getELFSection(".note.GNU-stack", ELF::SHT_PROGBITS,
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0, SectionKind::getMetadata());
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}
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X86MCAsmInfoCOFF::X86MCAsmInfoCOFF(const Triple &Triple) {
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if (Triple.getArch() == Triple::x86_64) {
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GlobalPrefix = "";
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PrivateGlobalPrefix = ".L";
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}
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AsmTransCBE = x86_asm_table;
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AssemblerDialect = AsmWriterFlavor;
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TextAlignFillValue = 0x90;
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}
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