#include "llvm/Support/Dwarf.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
+#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
void TargetLoweringObjectFile::Initialize(MCContext &ctx,
const TargetMachine &TM) {
Ctx = &ctx;
- DL = TM.getDataLayout();
- InitMCObjectFileInfo(TM.getTargetTriple(),
- TM.getRelocationModel(), TM.getCodeModel(), *Ctx);
+ InitMCObjectFileInfo(TM.getTargetTriple(), TM.getRelocationModel(),
+ TM.getCodeModel(), *Ctx);
}
-
+
TargetLoweringObjectFile::~TargetLoweringObjectFile() {
}
return false;
// If the global has an explicit section specified, don't put it in BSS.
- if (!GV->getSection().empty())
+ if (GV->hasSection())
return false;
// If -nozero-initialized-in-bss is specified, don't ever use BSS.
return false;
}
-/// Return the MCSymbol for the specified global value. This
-/// symbol is the main label that is the address of the global.
-MCSymbol *TargetLoweringObjectFile::getSymbol(Mangler &M,
- const GlobalValue *GV) const {
- SmallString<60> NameStr;
- M.getNameWithPrefix(NameStr, GV);
- return Ctx->GetOrCreateSymbol(NameStr.str());
-}
-
MCSymbol *TargetLoweringObjectFile::getSymbolWithGlobalValueBase(
- Mangler &M, const GlobalValue *GV, StringRef Suffix) const {
+ const GlobalValue *GV, StringRef Suffix, Mangler &Mang,
+ const TargetMachine &TM) const {
assert(!Suffix.empty());
SmallString<60> NameStr;
- NameStr += DL->getPrivateGlobalPrefix();
- M.getNameWithPrefix(NameStr, GV);
+ NameStr += GV->getParent()->getDataLayout().getPrivateGlobalPrefix();
+ TM.getNameWithPrefix(NameStr, GV, Mang);
NameStr.append(Suffix.begin(), Suffix.end());
- return Ctx->GetOrCreateSymbol(NameStr.str());
+ return Ctx->getOrCreateSymbol(NameStr);
}
-MCSymbol *TargetLoweringObjectFile::
-getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
- MachineModuleInfo *MMI) const {
- return getSymbol(*Mang, GV);
+MCSymbol *TargetLoweringObjectFile::getCFIPersonalitySymbol(
+ const GlobalValue *GV, Mangler &Mang, const TargetMachine &TM,
+ MachineModuleInfo *MMI) const {
+ return TM.getSymbol(GV, Mang);
}
void TargetLoweringObjectFile::emitPersonalityValue(MCStreamer &Streamer,
- const TargetMachine &TM,
+ const DataLayout &,
const MCSymbol *Sym) const {
}
// Early exit - functions should be always in text sections.
const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
- if (GVar == 0)
+ if (!GVar)
return SectionKind::getText();
// Handle thread-local data first.
// If the initializer for the global contains something that requires a
// relocation, then we may have to drop this into a writable data section
// even though it is marked const.
- switch (C->getRelocationInfo()) {
- case Constant::NoRelocation:
+ if (!C->needsRelocation()) {
// If the global is required to have a unique address, it can't be put
// into a mergable section: just drop it into the general read-only
// section instead.
if (!GVar->hasUnnamedAddr())
return SectionKind::getReadOnly();
-
+
// If initializer is a null-terminated string, put it in a "cstring"
// section of the right width.
if (ArrayType *ATy = dyn_cast<ArrayType>(C->getType())) {
// Otherwise, just drop it into a mergable constant section. If we have
// a section for this size, use it, otherwise use the arbitrary sized
// mergable section.
- switch (TM.getDataLayout()->getTypeAllocSize(C->getType())) {
+ switch (GV->getParent()->getDataLayout().getTypeAllocSize(C->getType())) {
case 4: return SectionKind::getMergeableConst4();
case 8: return SectionKind::getMergeableConst8();
case 16: return SectionKind::getMergeableConst16();
- default: return SectionKind::getMergeableConst();
- }
-
- case Constant::LocalRelocation:
- // In static relocation model, the linker will resolve all addresses, so
- // the relocation entries will actually be constants by the time the app
- // starts up. However, we can't put this into a mergable section, because
- // the linker doesn't take relocations into consideration when it tries to
- // merge entries in the section.
- if (ReloModel == Reloc::Static)
+ default:
return SectionKind::getReadOnly();
+ }
- // Otherwise, the dynamic linker needs to fix it up, put it in the
- // writable data.rel.local section.
- return SectionKind::getReadOnlyWithRelLocal();
-
- case Constant::GlobalRelocations:
+ } else {
// In static relocation model, the linker will resolve all addresses, so
// the relocation entries will actually be constants by the time the app
// starts up. However, we can't put this into a mergable section, because
// globals together onto fewer pages, improving the locality of the dynamic
// linker.
if (ReloModel == Reloc::Static)
- return SectionKind::getDataNoRel();
-
- switch (C->getRelocationInfo()) {
- case Constant::NoRelocation:
- return SectionKind::getDataNoRel();
- case Constant::LocalRelocation:
- return SectionKind::getDataRelLocal();
- case Constant::GlobalRelocations:
- return SectionKind::getDataRel();
- }
- llvm_unreachable("Invalid relocation");
+ return SectionKind::getData();
+
+ if (C->needsRelocation())
+ return SectionKind::getData();
+ return SectionKind::getData();
}
-/// SectionForGlobal - This method computes the appropriate section to emit
-/// the specified global variable or function definition. This should not
-/// be passed external (or available externally) globals.
-const MCSection *TargetLoweringObjectFile::
-SectionForGlobal(const GlobalValue *GV, SectionKind Kind, Mangler *Mang,
- const TargetMachine &TM) const {
+/// This method computes the appropriate section to emit the specified global
+/// variable or function definition. This should not be passed external (or
+/// available externally) globals.
+MCSection *
+TargetLoweringObjectFile::SectionForGlobal(const GlobalValue *GV,
+ SectionKind Kind, Mangler &Mang,
+ const TargetMachine &TM) const {
// Select section name.
if (GV->hasSection())
return getExplicitSectionGlobal(GV, Kind, Mang, TM);
return SelectSectionForGlobal(GV, Kind, Mang, TM);
}
+MCSection *TargetLoweringObjectFile::getSectionForJumpTable(
+ const Function &F, Mangler &Mang, const TargetMachine &TM) const {
+ return getSectionForConstant(F.getParent()->getDataLayout(),
+ SectionKind::getReadOnly(), /*C=*/nullptr);
+}
-// Lame default implementation. Calculate the section name for global.
-const MCSection *
-TargetLoweringObjectFile::SelectSectionForGlobal(const GlobalValue *GV,
- SectionKind Kind,
- Mangler *Mang,
- const TargetMachine &TM) const{
- assert(!Kind.isThreadLocal() && "Doesn't support TLS");
-
- if (Kind.isText())
- return getTextSection();
-
- if (Kind.isBSS() && BSSSection != 0)
- return BSSSection;
+bool TargetLoweringObjectFile::shouldPutJumpTableInFunctionSection(
+ bool UsesLabelDifference, const Function &F) const {
+ // In PIC mode, we need to emit the jump table to the same section as the
+ // function body itself, otherwise the label differences won't make sense.
+ // FIXME: Need a better predicate for this: what about custom entries?
+ if (UsesLabelDifference)
+ return true;
- if (Kind.isReadOnly() && ReadOnlySection != 0)
- return ReadOnlySection;
+ // We should also do if the section name is NULL or function is declared
+ // in discardable section
+ // FIXME: this isn't the right predicate, should be based on the MCSection
+ // for the function.
+ if (F.isWeakForLinker())
+ return true;
- return getDataSection();
+ return false;
}
-/// getSectionForConstant - Given a mergable constant with the
-/// specified size and relocation information, return a section that it
-/// should be placed in.
-const MCSection *
-TargetLoweringObjectFile::getSectionForConstant(SectionKind Kind) const {
- if (Kind.isReadOnly() && ReadOnlySection != 0)
+/// Given a mergable constant with the specified size and relocation
+/// information, return a section that it should be placed in.
+MCSection *TargetLoweringObjectFile::getSectionForConstant(
+ const DataLayout &DL, SectionKind Kind, const Constant *C) const {
+ if (Kind.isReadOnly() && ReadOnlySection != nullptr)
return ReadOnlySection;
return DataSection;
/// getTTypeGlobalReference - Return an MCExpr to use for a
/// reference to the specified global variable from exception
/// handling information.
-const MCExpr *TargetLoweringObjectFile::
-getTTypeGlobalReference(const GlobalValue *GV, Mangler *Mang,
- MachineModuleInfo *MMI, unsigned Encoding,
- MCStreamer &Streamer) const {
+const MCExpr *TargetLoweringObjectFile::getTTypeGlobalReference(
+ const GlobalValue *GV, unsigned Encoding, Mangler &Mang,
+ const TargetMachine &TM, MachineModuleInfo *MMI,
+ MCStreamer &Streamer) const {
const MCSymbolRefExpr *Ref =
- MCSymbolRefExpr::Create(getSymbol(*Mang, GV), getContext());
+ MCSymbolRefExpr::create(TM.getSymbol(GV, Mang), getContext());
return getTTypeReference(Ref, Encoding, Streamer);
}
case dwarf::DW_EH_PE_pcrel: {
// Emit a label to the streamer for the current position. This gives us
// .-foo addressing.
- MCSymbol *PCSym = getContext().CreateTempSymbol();
+ MCSymbol *PCSym = getContext().createTempSymbol();
Streamer.EmitLabel(PCSym);
- const MCExpr *PC = MCSymbolRefExpr::Create(PCSym, getContext());
- return MCBinaryExpr::CreateSub(Sym, PC, getContext());
+ const MCExpr *PC = MCSymbolRefExpr::create(PCSym, getContext());
+ return MCBinaryExpr::createSub(Sym, PC, getContext());
}
}
}
const MCExpr *TargetLoweringObjectFile::getDebugThreadLocalSymbol(const MCSymbol *Sym) const {
// FIXME: It's not clear what, if any, default this should have - perhaps a
// null return could mean 'no location' & we should just do that here.
- return MCSymbolRefExpr::Create(Sym, *Ctx);
+ return MCSymbolRefExpr::create(Sym, *Ctx);
+}
+
+void TargetLoweringObjectFile::getNameWithPrefix(
+ SmallVectorImpl<char> &OutName, const GlobalValue *GV, Mangler &Mang,
+ const TargetMachine &TM) const {
+ Mang.getNameWithPrefix(OutName, GV, /*CannotUsePrivateLabel=*/false);
}
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