-//===-- llvm/Target/X86/X86TargetObjectFile.cpp - X86 Object Info ---------===//
+//===-- X86TargetObjectFile.cpp - X86 Object Info -------------------------===//
//
// The LLVM Compiler Infrastructure
//
//
//===----------------------------------------------------------------------===//
-#include "X86MCTargetExpr.h"
#include "X86TargetObjectFile.h"
-#include "X86TargetMachine.h"
-#include "llvm/CodeGen/MachineModuleInfoImpls.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/IR/Mangler.h"
+#include "llvm/IR/Operator.h"
#include "llvm/MC/MCContext.h"
-#include "llvm/Target/Mangler.h"
-#include "llvm/ADT/SmallString.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCSectionCOFF.h"
+#include "llvm/MC/MCSectionELF.h"
+#include "llvm/MC/MCValue.h"
+#include "llvm/Support/COFF.h"
#include "llvm/Support/Dwarf.h"
+#include "llvm/Target/TargetLowering.h"
+
using namespace llvm;
using namespace dwarf;
-const MCExpr *X8664_MachoTargetObjectFile::
-getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
- MachineModuleInfo *MMI, unsigned Encoding) const {
+const MCExpr *X86_64MachoTargetObjectFile::getTTypeGlobalReference(
+ const GlobalValue *GV, unsigned Encoding, Mangler &Mang,
+ const TargetMachine &TM, MachineModuleInfo *MMI,
+ MCStreamer &Streamer) const {
// On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which
// is an indirect pc-relative reference.
- if (Encoding & (DW_EH_PE_indirect | DW_EH_PE_pcrel)) {
- SmallString<128> Name;
- Mang->getNameWithPrefix(Name, GV, false);
- const MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
+ if ((Encoding & DW_EH_PE_indirect) && (Encoding & DW_EH_PE_pcrel)) {
+ const MCSymbol *Sym = TM.getSymbol(GV, Mang);
const MCExpr *Res =
- X86MCTargetExpr::Create(Sym, X86MCTargetExpr::GOTPCREL, getContext());
- const MCExpr *Four = MCConstantExpr::Create(4, getContext());
- return MCBinaryExpr::CreateAdd(Res, Four, getContext());
+ MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOTPCREL, getContext());
+ const MCExpr *Four = MCConstantExpr::create(4, getContext());
+ return MCBinaryExpr::createAdd(Res, Four, getContext());
}
- return TargetLoweringObjectFileMachO::
- getSymbolForDwarfGlobalReference(GV, Mang, MMI, Encoding);
+ return TargetLoweringObjectFileMachO::getTTypeGlobalReference(
+ GV, Encoding, Mang, TM, MMI, Streamer);
}
-unsigned X8632_ELFTargetObjectFile::getPersonalityEncoding() const {
- if (TM.getRelocationModel() == Reloc::PIC_)
- return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
- else
- return DW_EH_PE_absptr;
+MCSymbol *X86_64MachoTargetObjectFile::getCFIPersonalitySymbol(
+ const GlobalValue *GV, Mangler &Mang, const TargetMachine &TM,
+ MachineModuleInfo *MMI) const {
+ return TM.getSymbol(GV, Mang);
}
-unsigned X8632_ELFTargetObjectFile::getLSDAEncoding() const {
- if (TM.getRelocationModel() == Reloc::PIC_)
- return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
- else
- return DW_EH_PE_absptr;
+const MCExpr *X86_64MachoTargetObjectFile::getIndirectSymViaGOTPCRel(
+ const MCSymbol *Sym, const MCValue &MV, int64_t Offset,
+ MachineModuleInfo *MMI, MCStreamer &Streamer) const {
+ // On Darwin/X86-64, we need to use foo@GOTPCREL+4 to access the got entry
+ // from a data section. In case there's an additional offset, then use
+ // foo@GOTPCREL+4+<offset>.
+ unsigned FinalOff = Offset+MV.getConstant()+4;
+ const MCExpr *Res =
+ MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOTPCREL, getContext());
+ const MCExpr *Off = MCConstantExpr::create(FinalOff, getContext());
+ return MCBinaryExpr::createAdd(Res, Off, getContext());
}
-unsigned X8632_ELFTargetObjectFile::getFDEEncoding() const {
- if (TM.getRelocationModel() == Reloc::PIC_)
- return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
- else
- return DW_EH_PE_absptr;
+const MCExpr *X86ELFTargetObjectFile::getDebugThreadLocalSymbol(
+ const MCSymbol *Sym) const {
+ return MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_DTPOFF, getContext());
}
-unsigned X8632_ELFTargetObjectFile::getTTypeEncoding() const {
- if (TM.getRelocationModel() == Reloc::PIC_)
- return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
- else
- return DW_EH_PE_absptr;
+void
+X86LinuxNaClTargetObjectFile::Initialize(MCContext &Ctx,
+ const TargetMachine &TM) {
+ TargetLoweringObjectFileELF::Initialize(Ctx, TM);
+ InitializeELF(TM.Options.UseInitArray);
}
-unsigned X8664_ELFTargetObjectFile::getPersonalityEncoding() const {
- CodeModel::Model Model = TM.getCodeModel();
- if (TM.getRelocationModel() == Reloc::PIC_)
- return DW_EH_PE_indirect | DW_EH_PE_pcrel | (Model == CodeModel::Small ||
- Model == CodeModel::Medium ?
- DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
-
- if (Model == CodeModel::Small || Model == CodeModel::Medium)
- return DW_EH_PE_udata4;
-
- return DW_EH_PE_absptr;
+const MCExpr *X86WindowsTargetObjectFile::getExecutableRelativeSymbol(
+ const ConstantExpr *CE, Mangler &Mang, const TargetMachine &TM) const {
+ // We are looking for the difference of two symbols, need a subtraction
+ // operation.
+ const SubOperator *Sub = dyn_cast<SubOperator>(CE);
+ if (!Sub)
+ return nullptr;
+
+ // Symbols must first be numbers before we can subtract them, we need to see a
+ // ptrtoint on both subtraction operands.
+ const PtrToIntOperator *SubLHS =
+ dyn_cast<PtrToIntOperator>(Sub->getOperand(0));
+ const PtrToIntOperator *SubRHS =
+ dyn_cast<PtrToIntOperator>(Sub->getOperand(1));
+ if (!SubLHS || !SubRHS)
+ return nullptr;
+
+ // Our symbols should exist in address space zero, cowardly no-op if
+ // otherwise.
+ if (SubLHS->getPointerAddressSpace() != 0 ||
+ SubRHS->getPointerAddressSpace() != 0)
+ return nullptr;
+
+ // Both ptrtoint instructions must wrap global objects:
+ // - Only global variables are eligible for image relative relocations.
+ // - The subtrahend refers to the special symbol __ImageBase, a GlobalVariable.
+ const auto *GOLHS = dyn_cast<GlobalObject>(SubLHS->getPointerOperand());
+ const auto *GVRHS = dyn_cast<GlobalVariable>(SubRHS->getPointerOperand());
+ if (!GOLHS || !GVRHS)
+ return nullptr;
+
+ // We expect __ImageBase to be a global variable without a section, externally
+ // defined.
+ //
+ // It should look something like this: @__ImageBase = external constant i8
+ if (GVRHS->isThreadLocal() || GVRHS->getName() != "__ImageBase" ||
+ !GVRHS->hasExternalLinkage() || GVRHS->hasInitializer() ||
+ GVRHS->hasSection())
+ return nullptr;
+
+ // An image-relative, thread-local, symbol makes no sense.
+ if (GOLHS->isThreadLocal())
+ return nullptr;
+
+ return MCSymbolRefExpr::create(TM.getSymbol(GOLHS, Mang),
+ MCSymbolRefExpr::VK_COFF_IMGREL32,
+ getContext());
}
-unsigned X8664_ELFTargetObjectFile::getLSDAEncoding() const {
- CodeModel::Model Model = TM.getCodeModel();
- if (TM.getRelocationModel() == Reloc::PIC_)
- return DW_EH_PE_pcrel | (Model == CodeModel::Small ?
- DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
+static std::string APIntToHexString(const APInt &AI) {
+ unsigned Width = (AI.getBitWidth() / 8) * 2;
+ std::string HexString = utohexstr(AI.getLimitedValue(), /*LowerCase=*/true);
+ unsigned Size = HexString.size();
+ assert(Width >= Size && "hex string is too large!");
+ HexString.insert(HexString.begin(), Width - Size, '0');
- if (Model == CodeModel::Small)
- return DW_EH_PE_udata4;
-
- return DW_EH_PE_absptr;
+ return HexString;
}
-unsigned X8664_ELFTargetObjectFile::getFDEEncoding() const {
- CodeModel::Model Model = TM.getCodeModel();
- if (TM.getRelocationModel() == Reloc::PIC_)
- return DW_EH_PE_pcrel | (Model == CodeModel::Small ||
- Model == CodeModel::Medium ?
- DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
-
- if (Model == CodeModel::Small || Model == CodeModel::Medium)
- return DW_EH_PE_udata4;
-
- return DW_EH_PE_absptr;
+static std::string scalarConstantToHexString(const Constant *C) {
+ Type *Ty = C->getType();
+ if (isa<UndefValue>(C)) {
+ return APIntToHexString(APInt::getNullValue(Ty->getPrimitiveSizeInBits()));
+ } else if (const auto *CFP = dyn_cast<ConstantFP>(C)) {
+ return APIntToHexString(CFP->getValueAPF().bitcastToAPInt());
+ } else if (const auto *CI = dyn_cast<ConstantInt>(C)) {
+ return APIntToHexString(CI->getValue());
+ } else {
+ unsigned NumElements;
+ if (isa<VectorType>(Ty))
+ NumElements = Ty->getVectorNumElements();
+ else
+ NumElements = Ty->getArrayNumElements();
+ std::string HexString;
+ for (int I = NumElements - 1, E = -1; I != E; --I)
+ HexString += scalarConstantToHexString(C->getAggregateElement(I));
+ return HexString;
+ }
}
-unsigned X8664_ELFTargetObjectFile::getTTypeEncoding() const {
- CodeModel::Model Model = TM.getCodeModel();
- if (TM.getRelocationModel() == Reloc::PIC_)
- return DW_EH_PE_indirect | DW_EH_PE_pcrel | (Model == CodeModel::Small ||
- Model == CodeModel::Medium ?
- DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
-
- if (Model == CodeModel::Small)
- return DW_EH_PE_udata4;
+MCSection *X86WindowsTargetObjectFile::getSectionForConstant(
+ const DataLayout &DL, SectionKind Kind, const Constant *C) const {
+ if (Kind.isMergeableConst() && C) {
+ const unsigned Characteristics = COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
+ COFF::IMAGE_SCN_MEM_READ |
+ COFF::IMAGE_SCN_LNK_COMDAT;
+ std::string COMDATSymName;
+ if (Kind.isMergeableConst4() || Kind.isMergeableConst8())
+ COMDATSymName = "__real@" + scalarConstantToHexString(C);
+ else if (Kind.isMergeableConst16())
+ COMDATSymName = "__xmm@" + scalarConstantToHexString(C);
+
+ if (!COMDATSymName.empty())
+ return getContext().getCOFFSection(".rdata", Characteristics, Kind,
+ COMDATSymName,
+ COFF::IMAGE_COMDAT_SELECT_ANY);
+ }
- return DW_EH_PE_absptr;
+ return TargetLoweringObjectFile::getSectionForConstant(DL, Kind, C);
}
projects / oota-llvm.git / blobdiff