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This mostly reverts commit r222062 and replaces it with a new enum. At some point this enum will grow at least for other MSVC EH personalities. Also beefs up the way we were sniffing the personality function. Previously we would emit the Itanium LSDA despite using __C_specific_handler. Reviewers: majnemer Differential Revision: http://reviews.llvm.org/D6987 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226920 91177308-0d34-0410-b5e6-96231b3b80d8
167 lines
5.3 KiB
C++
167 lines
5.3 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 "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 cl::opt<bool>
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MarkedJTDataRegions("mark-data-regions", cl::init(false),
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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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PointerSize = 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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PointerSize = (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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PointerSize = 8;
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WinEHEncodingType = WinEH::EncodingType::Itanium;
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ExceptionsType = ExceptionHandling::WinEH;
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}
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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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PointerSize = 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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