-//===-- llvm/Target/X86/X86TargetObjectFile.cpp - X86 Object Info ---------===//
+//===-- X86TargetObjectFile.cpp - X86 Object Info -------------------------===//
//
// The LLVM Compiler Infrastructure
//
//===----------------------------------------------------------------------===//
#include "X86TargetObjectFile.h"
-#include "X86TargetMachine.h"
-#include "llvm/CodeGen/MachineModuleInfoImpls.h"
+#include "llvm/IR/Mangler.h"
+#include "llvm/IR/Operator.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
-#include "llvm/MC/MCSectionMachO.h"
-#include "llvm/Target/Mangler.h"
-#include "llvm/ADT/SmallString.h"
+#include "llvm/MC/MCSectionELF.h"
#include "llvm/Support/Dwarf.h"
+#include "llvm/Target/TargetLowering.h"
+
using namespace llvm;
using namespace dwarf;
-const MCExpr *X8664_MachoTargetObjectFile::
-getExprForDwarfGlobalReference(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 = Mang->getSymbol(GV);
+ 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::
- getExprForDwarfGlobalReference(GV, Mang, MMI, Encoding, 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;
-}
-
-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;
+ return TargetLoweringObjectFileMachO::getTTypeGlobalReference(
+ GV, Encoding, Mang, TM, MMI, Streamer);
}
-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;
+MCSymbol *X86_64MachoTargetObjectFile::getCFIPersonalitySymbol(
+ const GlobalValue *GV, Mangler &Mang, const TargetMachine &TM,
+ MachineModuleInfo *MMI) const {
+ return TM.getSymbol(GV, Mang);
}
-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
+X86LinuxTargetObjectFile::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 *
+X86LinuxTargetObjectFile::getDebugThreadLocalSymbol(
+ const MCSymbol *Sym) const {
+ return MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_DTPOFF, 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);
-
- if (Model == CodeModel::Small)
- return DW_EH_PE_udata4;
-
- return DW_EH_PE_absptr;
-}
-
-unsigned X8664_ELFTargetObjectFile::getFDEEncoding() const {
- return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
-}
-
-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;
-
- 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 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());
}
projects / oota-llvm.git / blobdiff