//===----------------------------------------------------------------------===//
#include "llvm/Target/TargetLoweringObjectFile.h"
-#include "llvm/Constants.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/Function.h"
-#include "llvm/GlobalVariable.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/GlobalVariable.h"
+#include "llvm/IR/Mangler.h"
+#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
-#include "llvm/Target/Mangler.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/ADT/SmallString.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
// Generic Code
//===----------------------------------------------------------------------===//
-TargetLoweringObjectFile::TargetLoweringObjectFile() : Ctx(0) {
- TextSection = 0;
- DataSection = 0;
- BSSSection = 0;
- ReadOnlySection = 0;
- StaticCtorSection = 0;
- StaticDtorSection = 0;
- LSDASection = 0;
-
- CommDirectiveSupportsAlignment = true;
- DwarfAbbrevSection = 0;
- DwarfInfoSection = 0;
- DwarfLineSection = 0;
- DwarfFrameSection = 0;
- DwarfPubNamesSection = 0;
- DwarfPubTypesSection = 0;
- DwarfDebugInlineSection = 0;
- DwarfStrSection = 0;
- DwarfLocSection = 0;
- DwarfARangesSection = 0;
- DwarfRangesSection = 0;
- DwarfMacroInfoSection = 0;
-
- IsFunctionEHFrameSymbolPrivate = true;
- SupportsWeakOmittedEHFrame = true;
+/// Initialize - this method must be called before any actual lowering is
+/// done. This specifies the current context for codegen, and gives the
+/// lowering implementations a chance to set up their default sections.
+void TargetLoweringObjectFile::Initialize(MCContext &ctx,
+ const TargetMachine &TM) {
+ Ctx = &ctx;
+ DL = TM.getDataLayout();
+ InitMCObjectFileInfo(TM.getTargetTriple(),
+ TM.getRelocationModel(), TM.getCodeModel(), *Ctx);
}
-
+
TargetLoweringObjectFile::~TargetLoweringObjectFile() {
}
-static bool isSuitableForBSS(const GlobalVariable *GV) {
- Constant *C = GV->getInitializer();
+static bool isSuitableForBSS(const GlobalVariable *GV, bool NoZerosInBSS) {
+ const Constant *C = GV->getInitializer();
// Must have zero initializer.
if (!C->isNullValue())
/// IsNullTerminatedString - Return true if the specified constant (which is
/// known to have a type that is an array of 1/2/4 byte elements) ends with a
-/// nul value and contains no other nuls in it.
+/// nul value and contains no other nuls in it. Note that this is more general
+/// than ConstantDataSequential::isString because we allow 2 & 4 byte strings.
static bool IsNullTerminatedString(const Constant *C) {
- const ArrayType *ATy = cast<ArrayType>(C->getType());
-
- // First check: is we have constant array of i8 terminated with zero
- if (const ConstantArray *CVA = dyn_cast<ConstantArray>(C)) {
- if (ATy->getNumElements() == 0) return false;
-
- ConstantInt *Null =
- dyn_cast<ConstantInt>(CVA->getOperand(ATy->getNumElements()-1));
- if (Null == 0 || !Null->isZero())
+ // First check: is we have constant array terminated with zero
+ if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(C)) {
+ unsigned NumElts = CDS->getNumElements();
+ assert(NumElts != 0 && "Can't have an empty CDS");
+
+ if (CDS->getElementAsInteger(NumElts-1) != 0)
return false; // Not null terminated.
-
+
// Verify that the null doesn't occur anywhere else in the string.
- for (unsigned i = 0, e = ATy->getNumElements()-1; i != e; ++i)
- // Reject constantexpr elements etc.
- if (!isa<ConstantInt>(CVA->getOperand(i)) ||
- CVA->getOperand(i) == Null)
+ for (unsigned i = 0; i != NumElts-1; ++i)
+ if (CDS->getElementAsInteger(i) == 0)
return false;
return true;
}
// Another possibility: [1 x i8] zeroinitializer
if (isa<ConstantAggregateZero>(C))
- return ATy->getNumElements() == 1;
+ return cast<ArrayType>(C->getType())->getNumElements() == 1;
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 {
+ assert(!Suffix.empty());
+
+ SmallString<60> NameStr;
+ NameStr += DL->getPrivateGlobalPrefix();
+ M.getNameWithPrefix(NameStr, GV);
+ NameStr.append(Suffix.begin(), Suffix.end());
+ return Ctx->GetOrCreateSymbol(NameStr.str());
+}
+
MCSymbol *TargetLoweringObjectFile::
getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
MachineModuleInfo *MMI) const {
- return Mang->getSymbol(GV);
+ return getSymbol(*Mang, GV);
}
void TargetLoweringObjectFile::emitPersonalityValue(MCStreamer &Streamer,
// Handle thread-local data first.
if (GVar->isThreadLocal()) {
- if (isSuitableForBSS(GVar))
+ if (isSuitableForBSS(GVar, TM.Options.NoZerosInBSS))
return SectionKind::getThreadBSS();
return SectionKind::getThreadData();
}
return SectionKind::getCommon();
// Variable can be easily put to BSS section.
- if (isSuitableForBSS(GVar)) {
+ if (isSuitableForBSS(GVar, TM.Options.NoZerosInBSS)) {
if (GVar->hasLocalLinkage())
return SectionKind::getBSSLocal();
else if (GVar->hasExternalLinkage())
return SectionKind::getBSS();
}
- Constant *C = GVar->getInitializer();
+ const Constant *C = GVar->getInitializer();
// If the global is marked constant, we can put it into a mergable section,
// a mergable string section, or general .data if it contains relocations.
if (GVar->isConstant()) {
// If the initializer for the global contains something that requires a
- // relocation, then we may have to drop this into a wriable data section
+ // relocation, then we may have to drop this into a writable data section
// even though it is marked const.
switch (C->getRelocationInfo()) {
- default: assert(0 && "unknown relocation info kind");
case Constant::NoRelocation:
// 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
// If initializer is a null-terminated string, put it in a "cstring"
// section of the right width.
- if (
const ArrayType *ATy = dyn_cast<ArrayType>(C->getType())) {
- if (const IntegerType *ITy =
+ if (ArrayType *ATy = dyn_cast<ArrayType>(C->getType())) {
+ if (IntegerType *ITy =
dyn_cast<IntegerType>(ATy->getElementType())) {
if ((ITy->getBitWidth() == 8 || ITy->getBitWidth() == 16 ||
ITy->getBitWidth() == 32) &&
// 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.getTargetData()->getTypeAllocSize(C->getType())) {
+ switch (TM.getDataLayout()->getTypeAllocSize(C->getType())) {
case 4: return SectionKind::getMergeableConst4();
case 8: return SectionKind::getMergeableConst8();
case 16: return SectionKind::getMergeableConst16();
return SectionKind::getDataNoRel();
switch (C->getRelocationInfo()) {
- default: assert(0 && "unknown relocation info kind");
case Constant::NoRelocation:
return SectionKind::getDataNoRel();
case Constant::LocalRelocation:
case Constant::GlobalRelocations:
return SectionKind::getDataRel();
}
+ llvm_unreachable("Invalid relocation");
}
/// SectionForGlobal - This method computes the appropriate section to emit
return DataSection;
}
-/// getExprForDwarfGlobalReference - Return an MCExpr to use for a
+/// getTTypeGlobalReference - Return an MCExpr to use for a
/// reference to the specified global variable from exception
/// handling information.
const MCExpr *TargetLoweringObjectFile::
-getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
- MachineModuleInfo *MMI, unsigned Encoding,
- MCStreamer &Streamer) const {
- const MCSymbol *Sym = Mang->getSymbol(GV);
- return getExprForDwarfReference(Sym, Encoding, Streamer);
+getTTypeGlobalReference(const GlobalValue *GV, Mangler *Mang,
+ MachineModuleInfo *MMI, unsigned Encoding,
+ MCStreamer &Streamer) const {
+ const MCSymbolRefExpr *Ref =
+ MCSymbolRefExpr::Create(getSymbol(*Mang, GV), getContext());
+
+ return getTTypeReference(Ref, Encoding, Streamer);
}
const MCExpr *TargetLoweringObjectFile::
-getExprForDwarfReference(const MCSymbol *Sym, unsigned Encoding,
- MCStreamer &Streamer) const {
- const MCExpr *Res = MCSymbolRefExpr::Create(Sym, getContext());
-
+getTTypeReference(const MCSymbolRefExpr *Sym, unsigned Encoding,
+ MCStreamer &Streamer) const {
switch (Encoding & 0x70) {
default:
report_fatal_error("We do not support this DWARF encoding yet!");
case dwarf::DW_EH_PE_absptr:
// Do nothing special
- return Res;
+ return Sym;
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();
Streamer.EmitLabel(PCSym);
const MCExpr *PC = MCSymbolRefExpr::Create(PCSym, getContext());
- return MCBinaryExpr::CreateSub(Res, PC, getContext());
+ return MCBinaryExpr::CreateSub(Sym, PC, getContext());
}
}
}
-unsigned TargetLoweringObjectFile::getPersonalityEncoding() const {
- return dwarf::DW_EH_PE_absptr;
-}
-
-unsigned TargetLoweringObjectFile::getLSDAEncoding() const {
- return dwarf::DW_EH_PE_absptr;
-}
-
-unsigned TargetLoweringObjectFile::getFDEEncoding(bool CFI) const {
- return dwarf::DW_EH_PE_absptr;
+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);
}
-
-unsigned TargetLoweringObjectFile::getTTypeEncoding() const {
- return dwarf::DW_EH_PE_absptr;
-}
-
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