//===----------------------------------------------------------------------===//
#include "X86TargetObjectFile.h"
+#include "llvm/ADT/StringExtras.h"
#include "llvm/IR/Mangler.h"
+#include "llvm/IR/Operator.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCSectionCOFF.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/Support/Dwarf.h"
+#include "llvm/Target/TargetLowering.h"
using namespace llvm;
using namespace dwarf;
-const MCExpr *X86_64MachoTargetObjectFile::
-getTTypeGlobalReference(const GlobalValue *GV, Mangler *Mang,
- MachineModuleInfo *MMI, unsigned Encoding,
- MCStreamer &Streamer) 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)) {
- const MCSymbol *Sym = getSymbol(*Mang, GV);
+ if ((Encoding & DW_EH_PE_indirect) && (Encoding & DW_EH_PE_pcrel)) {
+ const MCSymbol *Sym = TM.getSymbol(GV, Mang);
const MCExpr *Res =
MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_GOTPCREL, getContext());
const MCExpr *Four = MCConstantExpr::Create(4, getContext());
return MCBinaryExpr::CreateAdd(Res, Four, getContext());
}
- return TargetLoweringObjectFileMachO::
- getTTypeGlobalReference(GV, Mang, MMI, Encoding, Streamer);
+ return TargetLoweringObjectFileMachO::getTTypeGlobalReference(
+ GV, Encoding, Mang, TM, MMI, Streamer);
}
-MCSymbol *X86_64MachoTargetObjectFile::
-getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
- MachineModuleInfo *MMI) const {
- return getSymbol(*Mang, GV);
+MCSymbol *X86_64MachoTargetObjectFile::getCFIPersonalitySymbol(
+ const GlobalValue *GV, Mangler &Mang, const TargetMachine &TM,
+ MachineModuleInfo *MMI) const {
+ return TM.getSymbol(GV, Mang);
}
void
const MCSymbol *Sym) const {
return MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_DTPOFF, getContext());
}
+
+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 variables:
+ // - Only global variables are eligible for image relative relocations.
+ // - The subtrahend refers to the special symbol __ImageBase, a global.
+ const GlobalVariable *GVLHS =
+ dyn_cast<GlobalVariable>(SubLHS->getPointerOperand());
+ const GlobalVariable *GVRHS =
+ dyn_cast<GlobalVariable>(SubRHS->getPointerOperand());
+ if (!GVLHS || !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 (GVLHS->isThreadLocal())
+ return nullptr;
+
+ return MCSymbolRefExpr::Create(TM.getSymbol(GVLHS, Mang),
+ MCSymbolRefExpr::VK_COFF_IMGREL32,
+ getContext());
+}
+
+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');
+
+ return HexString;
+}
+
+
+static std::string scalarConstantToHexString(const Constant *C) {
+ Type *Ty = C->getType();
+ APInt AI;
+ if (isa<UndefValue>(C)) {
+ AI = APInt(Ty->getPrimitiveSizeInBits(), /*val=*/0);
+ } else if (Ty->isFloatTy() || Ty->isDoubleTy()) {
+ const auto *CFP = cast<ConstantFP>(C);
+ AI = CFP->getValueAPF().bitcastToAPInt();
+ } else if (Ty->isIntegerTy()) {
+ const auto *CI = cast<ConstantInt>(C);
+ AI = CI->getValue();
+ } else {
+ llvm_unreachable("unexpected constant pool element type!");
+ }
+ return APIntToHexString(AI);
+}
+
+const MCSection *
+X86WindowsTargetObjectFile::getSectionForConstant(SectionKind Kind,
+ const Constant *C) const {
+ if (Kind.isReadOnly()) {
+ if (C) {
+ Type *Ty = C->getType();
+ SmallString<32> COMDATSymName;
+ if (Ty->isFloatTy() || Ty->isDoubleTy()) {
+ COMDATSymName = "__real@";
+ COMDATSymName += scalarConstantToHexString(C);
+ } else if (const auto *VTy = dyn_cast<VectorType>(Ty)) {
+ uint64_t NumBits = VTy->getBitWidth();
+ if (NumBits == 128 || NumBits == 256) {
+ COMDATSymName = NumBits == 128 ? "__xmm@" : "__ymm@";
+ for (int I = VTy->getNumElements() - 1, E = -1; I != E; --I)
+ COMDATSymName +=
+ scalarConstantToHexString(C->getAggregateElement(I));
+ }
+ }
+ if (!COMDATSymName.empty()) {
+ unsigned Characteristics = COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
+ COFF::IMAGE_SCN_MEM_READ |
+ COFF::IMAGE_SCN_LNK_COMDAT;
+ return getContext().getCOFFSection(".rdata", Characteristics, Kind,
+ COMDATSymName,
+ COFF::IMAGE_COMDAT_SELECT_ANY);
+ }
+ }
+ }
+
+ return TargetLoweringObjectFile::getSectionForConstant(Kind, C);
+}
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