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Imported Upstream version 5.18.0.167
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//===-- 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 "llvm/ADT/Triple.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Support/CommandLine.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> AsmWriterFlavor(
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"x86-asm-syntax", cl::init(ATT), cl::Hidden,
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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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static cl::opt<bool>
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MarkedJTDataRegions("mark-data-regions", cl::init(true),
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cl::desc("Mark code section jump table data regions."),
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cl::Hidden);
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void X86MCAsmInfoDarwin::anchor() { }
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X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &T) {
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bool is64Bit = T.getArch() == Triple::x86_64;
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if (is64Bit)
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CodePointerSize = CalleeSaveStackSlotSize = 8;
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AssemblerDialect = AsmWriterFlavor;
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TextAlignFillValue = 0x90;
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if (!is64Bit)
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Data64bitsDirective = nullptr; // 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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SupportsDebugInformation = true;
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UseDataRegionDirectives = MarkedJTDataRegions;
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// Exceptions handling
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ExceptionsType = ExceptionHandling::DwarfCFI;
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// old assembler lacks some directives
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// FIXME: this should really be a check on the assembler characteristics
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// rather than OS version
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if (T.isMacOSX() && T.isMacOSXVersionLT(10, 6))
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HasWeakDefCanBeHiddenDirective = false;
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// Assume ld64 is new enough that the abs-ified FDE relocs may be used
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// (actually, must, since otherwise the non-extern relocations we produce
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// overwhelm ld64's tiny little mind and it fails).
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DwarfFDESymbolsUseAbsDiff = true;
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UseIntegratedAssembler = true;
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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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void X86ELFMCAsmInfo::anchor() { }
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X86ELFMCAsmInfo::X86ELFMCAsmInfo(const Triple &T) {
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bool is64Bit = T.getArch() == Triple::x86_64;
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bool isX32 = T.getEnvironment() == Triple::GNUX32;
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// For ELF, x86-64 pointer size depends on the ABI.
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// For x86-64 without the x32 ABI, pointer size is 8. For x86 and for x86-64
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// with the x32 ABI, pointer size remains the default 4.
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CodePointerSize = (is64Bit && !isX32) ? 8 : 4;
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// OTOH, stack slot size is always 8 for x86-64, even with the x32 ABI.
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CalleeSaveStackSlotSize = is64Bit ? 8 : 4;
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AssemblerDialect = AsmWriterFlavor;
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TextAlignFillValue = 0x90;
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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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// Always enable the integrated assembler by default.
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// Clang also enabled it when the OS is Solaris but that is redundant here.
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UseIntegratedAssembler = true;
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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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void X86MCAsmInfoMicrosoft::anchor() { }
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X86MCAsmInfoMicrosoft::X86MCAsmInfoMicrosoft(const Triple &Triple) {
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if (Triple.getArch() == Triple::x86_64) {
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PrivateGlobalPrefix = ".L";
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PrivateLabelPrefix = ".L";
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CodePointerSize = 8;
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WinEHEncodingType = WinEH::EncodingType::Itanium;
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} else {
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// 32-bit X86 doesn't use CFI, so this isn't a real encoding type. It's just
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// a place holder that the Windows EHStreamer looks for to suppress CFI
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// output. In particular, usesWindowsCFI() returns false.
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WinEHEncodingType = WinEH::EncodingType::X86;
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}
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ExceptionsType = ExceptionHandling::WinEH;
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AssemblerDialect = AsmWriterFlavor;
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TextAlignFillValue = 0x90;
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AllowAtInName = true;
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UseIntegratedAssembler = true;
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}
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void X86MCAsmInfoGNUCOFF::anchor() { }
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X86MCAsmInfoGNUCOFF::X86MCAsmInfoGNUCOFF(const Triple &Triple) {
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assert(Triple.isOSWindows() && "Windows is the only supported COFF target");
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if (Triple.getArch() == Triple::x86_64) {
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PrivateGlobalPrefix = ".L";
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PrivateLabelPrefix = ".L";
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CodePointerSize = 8;
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WinEHEncodingType = WinEH::EncodingType::Itanium;
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ExceptionsType = ExceptionHandling::WinEH;
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} else {
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ExceptionsType = ExceptionHandling::DwarfCFI;
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}
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AssemblerDialect = AsmWriterFlavor;
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TextAlignFillValue = 0x90;
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UseIntegratedAssembler = true;
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}
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