#include "llvm/PassManager.h"
#include "llvm/DerivedTypes.h"
#include "llvm/CodeGen/BinaryObject.h"
-#include "llvm/CodeGen/FileWriters.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/CodeGen/ObjectCodeEmitter.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCSectionELF.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/Target/Mangler.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetELFWriterInfo.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetMachine.h"
-#include "llvm/Support/Mangler.h"
-#include "llvm/Support/Streams.h"
-#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
-
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/ADT/SmallString.h"
using namespace llvm;
char ELFWriter::ID = 0;
-/// AddELFWriter - Add the ELF writer to the function pass manager
-ObjectCodeEmitter *llvm::AddELFWriter(PassManagerBase &PM,
- raw_ostream &O,
- TargetMachine &TM) {
- ELFWriter *EW = new ELFWriter(O, TM);
- PM.add(EW);
- return EW->getObjectCodeEmitter();
-}
-
//===----------------------------------------------------------------------===//
// ELFWriter Implementation
//===----------------------------------------------------------------------===//
ELFWriter::ELFWriter(raw_ostream &o, TargetMachine &tm)
- : MachineFunctionPass(&ID), O(o), TM(tm),
- OutContext(*new MCContext()),
+ : MachineFunctionPass(ID), O(o), TM(tm),
+ OutContext(*new MCContext(*TM.getMCAsmInfo(), new TargetAsmInfo(tm))),
TLOF(TM.getTargetLowering()->getObjFileLowering()),
is64Bit(TM.getTargetData()->getPointerSizeInBits() == 64),
isLittleEndian(TM.getTargetData()->isLittleEndian()),
ElfHdr(isLittleEndian, is64Bit) {
- TAI = TM.getTargetAsmInfo();
+ MAI = TM.getMCAsmInfo();
TEW = TM.getELFWriterInfo();
// Create the object code emitter object for this target.
ELFWriter::~ELFWriter() {
delete ElfCE;
delete &OutContext;
+
+ while(!SymbolList.empty()) {
+ delete SymbolList.back();
+ SymbolList.pop_back();
+ }
+
+ while(!PrivateSyms.empty()) {
+ delete PrivateSyms.back();
+ PrivateSyms.pop_back();
+ }
+
+ while(!SectionList.empty()) {
+ delete SectionList.back();
+ SectionList.pop_back();
+ }
+
+ // Release the name mangler object.
+ delete Mang; Mang = 0;
}
// doInitialization - Emit the file header and all of the global variables for
// Initialize TargetLoweringObjectFile.
const_cast<TargetLoweringObjectFile&>(TLOF).Initialize(OutContext, TM);
- Mang = new Mangler(M);
+ Mang = new Mangler(OutContext, *TM.getTargetData());
// ELF Header
// ----------
ElfHdr.emitByte(TEW->getEIClass()); // e_ident[EI_CLASS]
ElfHdr.emitByte(TEW->getEIData()); // e_ident[EI_DATA]
- ElfHdr.emitByte(EV_CURRENT); // e_ident[EI_VERSION]
+ ElfHdr.emitByte(ELF::EV_CURRENT); // e_ident[EI_VERSION]
ElfHdr.emitAlignment(16); // e_ident[EI_NIDENT-EI_PAD]
- ElfHdr.emitWord16(ET_REL); // e_type
+ ElfHdr.emitWord16(ELF::ET_REL); // e_type
ElfHdr.emitWord16(TEW->getEMachine()); // e_machine = target
- ElfHdr.emitWord32(EV_CURRENT); // e_version
+ ElfHdr.emitWord32(ELF::EV_CURRENT); // e_version
ElfHdr.emitWord(0); // e_entry, no entry point in .o file
ElfHdr.emitWord(0); // e_phoff, no program header for .o
ELFHdr_e_shoff_Offset = ElfHdr.size();
return false;
}
-// addGlobalSymbol - Add a global to be processed and to the global symbol
-// lookup, use a zero index because the table index will be determined later.
-void ELFWriter::addGlobalSymbol(const GlobalValue *GV,
- bool AddToLookup /* = false */) {
+// AddPendingGlobalSymbol - Add a global to be processed and to
+// the global symbol lookup, use a zero index because the table
+// index will be determined later.
+void ELFWriter::AddPendingGlobalSymbol(const GlobalValue *GV,
+ bool AddToLookup /* = false */) {
PendingGlobals.insert(GV);
if (AddToLookup)
GblSymLookup[GV] = 0;
}
-// addExternalSymbol - Add the external to be processed and to the
-// external symbol lookup, use a zero index because the symbol
-// table index will be determined later
-void ELFWriter::addExternalSymbol(const char *External) {
+// AddPendingExternalSymbol - Add the external to be processed
+// and to the external symbol lookup, use a zero index because
+// the symbol table index will be determined later.
+void ELFWriter::AddPendingExternalSymbol(const char *External) {
PendingExternals.insert(External);
ExtSymLookup[External] = 0;
}
+ELFSection &ELFWriter::getDataSection() {
+ const MCSectionELF *Data = (const MCSectionELF *)TLOF.getDataSection();
+ return getSection(Data->getSectionName(), Data->getType(),
+ Data->getFlags(), 4);
+}
+
+ELFSection &ELFWriter::getBSSSection() {
+ const MCSectionELF *BSS = (const MCSectionELF *)TLOF.getBSSSection();
+ return getSection(BSS->getSectionName(), BSS->getType(), BSS->getFlags(), 4);
+}
+
// getCtorSection - Get the static constructor section
ELFSection &ELFWriter::getCtorSection() {
- const MCSection *Ctor = TLOF.getStaticCtorSection();
- return getSection(((MCSectionELF*)Ctor)->getName(), ELFSection::SHT_PROGBITS,
- getElfSectionFlags(Ctor->getKind()));
+ const MCSectionELF *Ctor = (const MCSectionELF *)TLOF.getStaticCtorSection();
+ return getSection(Ctor->getSectionName(), Ctor->getType(), Ctor->getFlags());
}
// getDtorSection - Get the static destructor section
ELFSection &ELFWriter::getDtorSection() {
- const MCSection *Dtor = TLOF.getStaticDtorSection();
- return getSection(((MCSectionELF*)Dtor)->getName(), ELFSection::SHT_PROGBITS,
- getElfSectionFlags(Dtor->getKind()));
+ const MCSectionELF *Dtor = (const MCSectionELF *)TLOF.getStaticDtorSection();
+ return getSection(Dtor->getSectionName(), Dtor->getType(), Dtor->getFlags());
}
// getTextSection - Get the text section for the specified function
-ELFSection &ELFWriter::getTextSection(Function *F) {
- const MCSection *Text = TLOF.SectionForGlobal(F, Mang, TM);
- return getSection(((MCSectionELF*)Text)->getName(), ELFSection::SHT_PROGBITS,
- getElfSectionFlags(Text->getKind()));
+ELFSection &ELFWriter::getTextSection(const Function *F) {
+ const MCSectionELF *Text =
+ (const MCSectionELF *)TLOF.SectionForGlobal(F, Mang, TM);
+ return getSection(Text->getSectionName(), Text->getType(), Text->getFlags());
}
// getJumpTableSection - Get a read only section for constants when
// emitting jump tables. TODO: add PIC support
ELFSection &ELFWriter::getJumpTableSection() {
- const MCSection *JT = TLOF.getSectionForConstant(SectionKind::getReadOnly());
- return getSection(((MCSectionELF*)JT)->getName(),
- ELFSection::SHT_PROGBITS,
- getElfSectionFlags(JT->getKind()),
+ const MCSectionELF *JT =
+ (const MCSectionELF *)TLOF.getSectionForConstant(SectionKind::getReadOnly());
+ return getSection(JT->getSectionName(), JT->getType(), JT->getFlags(),
TM.getTargetData()->getPointerABIAlignment());
}
}
}
- const MCSection *CPSect = TLOF.getSectionForConstant(Kind);
- return getSection(((MCSectionELF*)CPSect)->getName(),
- ELFSection::SHT_PROGBITS,
- getElfSectionFlags(Kind),
- CPE.getAlignment());
+ const MCSectionELF *CPSect =
+ (const MCSectionELF *)TLOF.getSectionForConstant(Kind);
+ return getSection(CPSect->getSectionName(), CPSect->getType(),
+ CPSect->getFlags(), CPE.getAlignment());
}
// getRelocSection - Return the relocation section of section 'S'. 'RelA'
// is true if the relocation section contains entries with addends.
ELFSection &ELFWriter::getRelocSection(ELFSection &S) {
- unsigned SectionHeaderTy = TEW->hasRelocationAddend() ?
- ELFSection::SHT_RELA : ELFSection::SHT_REL;
- std::string RelSName(".rel");
+ unsigned SectionType = TEW->hasRelocationAddend() ?
+ ELF::SHT_RELA : ELF::SHT_REL;
+
+ std::string SectionName(".rel");
if (TEW->hasRelocationAddend())
- RelSName.append("a");
- RelSName.append(S.getName());
+ SectionName.append("a");
+ SectionName.append(S.getName());
- return getSection(RelSName, SectionHeaderTy, 0, TEW->getPrefELFAlignment());
+ return getSection(SectionName, SectionType, 0, TEW->getPrefELFAlignment());
}
// getGlobalELFVisibility - Returns the ELF specific visibility type
default:
llvm_unreachable("unknown visibility type");
case GlobalValue::DefaultVisibility:
- return ELFSym::STV_DEFAULT;
+ return ELF::STV_DEFAULT;
case GlobalValue::HiddenVisibility:
- return ELFSym::STV_HIDDEN;
+ return ELF::STV_HIDDEN;
case GlobalValue::ProtectedVisibility:
- return ELFSym::STV_PROTECTED;
+ return ELF::STV_PROTECTED;
}
return 0;
}
// getGlobalELFBinding - Returns the ELF specific binding type
unsigned ELFWriter::getGlobalELFBinding(const GlobalValue *GV) {
if (GV->hasInternalLinkage())
- return ELFSym::STB_LOCAL;
+ return ELF::STB_LOCAL;
if (GV->isWeakForLinker() && !GV->hasCommonLinkage())
- return ELFSym::STB_WEAK;
+ return ELF::STB_WEAK;
- return ELFSym::STB_GLOBAL;
+ return ELF::STB_GLOBAL;
}
// getGlobalELFType - Returns the ELF specific type for a global
unsigned ELFWriter::getGlobalELFType(const GlobalValue *GV) {
if (GV->isDeclaration())
- return ELFSym::STT_NOTYPE;
+ return ELF::STT_NOTYPE;
if (isa<Function>(GV))
- return ELFSym::STT_FUNC;
+ return ELF::STT_FUNC;
- return ELFSym::STT_OBJECT;
+ return ELF::STT_OBJECT;
}
-// getElfSectionFlags - Get the ELF Section Header flags based
-// on the flags defined in SectionKind.h.
-unsigned ELFWriter::getElfSectionFlags(SectionKind Kind, bool IsAlloc) {
- unsigned ElfSectionFlags = 0;
-
- if (IsAlloc)
- ElfSectionFlags |= ELFSection::SHF_ALLOC;
- if (Kind.isText())
- ElfSectionFlags |= ELFSection::SHF_EXECINSTR;
- if (Kind.isWriteable())
- ElfSectionFlags |= ELFSection::SHF_WRITE;
- if (Kind.isMergeableConst() || Kind.isMergeableCString())
- ElfSectionFlags |= ELFSection::SHF_MERGE;
- if (Kind.isThreadLocal())
- ElfSectionFlags |= ELFSection::SHF_TLS;
- if (Kind.isMergeableCString())
- ElfSectionFlags |= ELFSection::SHF_STRINGS;
-
- return ElfSectionFlags;
+// IsELFUndefSym - True if the global value must be marked as a symbol
+// which points to a SHN_UNDEF section. This means that the symbol has
+// no definition on the module.
+static bool IsELFUndefSym(const GlobalValue *GV) {
+ return GV->isDeclaration() || (isa<Function>(GV));
}
-// isUndefOrNull - The constant is either a null initialized value or an
-// undefined one.
-static bool isUndefOrNull(const Constant *CV) {
- return (CV->isNullValue() || isa<UndefValue>(CV));
-}
+// AddToSymbolList - Update the symbol lookup and If the symbol is
+// private add it to PrivateSyms list, otherwise to SymbolList.
+void ELFWriter::AddToSymbolList(ELFSym *GblSym) {
+ assert(GblSym->isGlobalValue() && "Symbol must be a global value");
-// isELFUndefSym - the symbol has no section and must be placed in
-// the symbol table with a reference to the null section.
-static bool isELFUndefSym(const GlobalValue *GV) {
- // Functions which make up until this point references are an undef symbol
- return GV->isDeclaration() || (isa<Function>(GV));
+ const GlobalValue *GV = GblSym->getGlobalValue();
+ if (GV->hasPrivateLinkage()) {
+ // For a private symbols, keep track of the index inside
+ // the private list since it will never go to the symbol
+ // table and won't be patched up later.
+ PrivateSyms.push_back(GblSym);
+ GblSymLookup[GV] = PrivateSyms.size()-1;
+ } else {
+ // Non private symbol are left with zero indices until
+ // they are patched up during the symbol table emition
+ // (where the indicies are created).
+ SymbolList.push_back(GblSym);
+ GblSymLookup[GV] = 0;
+ }
}
-// isELFBssSym - for an undef or null value, the symbol must go to a bss
-// section if it's not weak for linker, otherwise it's a common sym.
-static bool isELFBssSym(const GlobalVariable *GV, SectionKind Kind) {
- const Constant *CV = GV->getInitializer();
+/// HasCommonSymbols - True if this section holds common symbols, this is
+/// indicated on the ELF object file by a symbol with SHN_COMMON section
+/// header index.
+static bool HasCommonSymbols(const MCSectionELF &S) {
+ // FIXME: this is wrong, a common symbol can be in .data for example.
+ if (StringRef(S.getSectionName()).startswith(".gnu.linkonce."))
+ return true;
- return (!Kind.isMergeableCString() &&
- isUndefOrNull(CV) &&
- !GV->isWeakForLinker());
+ return false;
}
-// isELFCommonSym - for an undef or null value, the symbol must go to a
-// common section if it's weak for linker, otherwise bss.
-static bool isELFCommonSym(const GlobalVariable *GV) {
- return (isUndefOrNull(GV->getInitializer()) && GV->isWeakForLinker());
-}
// EmitGlobal - Choose the right section for global and emit it
void ELFWriter::EmitGlobal(const GlobalValue *GV) {
// Handle ELF Bind, Visibility and Type for the current symbol
unsigned SymBind = getGlobalELFBinding(GV);
unsigned SymType = getGlobalELFType(GV);
+ bool IsUndefSym = IsELFUndefSym(GV);
- // All undef symbols have the same binding, type and visibily and
- // are classified regardless of their type.
- ELFSym *GblSym = isELFUndefSym(GV) ? ELFSym::getUndefGV(GV, SymBind)
+ ELFSym *GblSym = IsUndefSym ? ELFSym::getUndefGV(GV, SymBind)
: ELFSym::getGV(GV, SymBind, SymType, getGlobalELFVisibility(GV));
- if (!isELFUndefSym(GV)) {
+ if (!IsUndefSym) {
assert(isa<GlobalVariable>(GV) && "GV not a global variable!");
const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
return;
// Get the ELF section where this global belongs from TLOF
- const MCSection *S = TLOF.SectionForGlobal(GV, Mang, TM);
- SectionKind Kind = ((MCSectionELF*)S)->getKind();
- unsigned SectionFlags = getElfSectionFlags(Kind);
+ const MCSectionELF *S =
+ (const MCSectionELF *)TLOF.SectionForGlobal(GV, Mang, TM);
+ ELFSection &ES =
+ getSection(S->getSectionName(), S->getType(), S->getFlags());
+ SectionKind Kind = S->getKind();
// The symbol align should update the section alignment if needed
const TargetData *TD = TM.getTargetData();
unsigned Size = TD->getTypeAllocSize(GVar->getInitializer()->getType());
GblSym->Size = Size;
- if (isELFCommonSym(GVar)) {
- GblSym->SectionIdx = ELFSection::SHN_COMMON;
- getSection(((MCSectionELF*)S)->getName(),
- ELFSection::SHT_NOBITS, SectionFlags, 1);
+ if (HasCommonSymbols(*S)) { // Symbol must go to a common section
+ GblSym->SectionIdx = ELF::SHN_COMMON;
// A new linkonce section is created for each global in the
// common section, the default alignment is 1 and the symbol
// value contains its alignment.
+ ES.Align = 1;
GblSym->Value = Align;
- } else if (isELFBssSym(GVar, Kind)) {
- ELFSection &ES =
- getSection(((MCSectionELF*)S)->getName(), ELFSection::SHT_NOBITS,
- SectionFlags);
+ } else if (Kind.isBSS() || Kind.isThreadBSS()) { // Symbol goes to BSS.
GblSym->SectionIdx = ES.SectionIdx;
// Update the size with alignment and the next object can
ES.Size += Size;
} else { // The symbol must go to some kind of data section
- ELFSection &ES =
- getSection(((MCSectionELF*)S)->getName(), ELFSection::SHT_PROGBITS,
- SectionFlags);
GblSym->SectionIdx = ES.SectionIdx;
// GblSym->Value should contain the symbol offset inside the section,
}
}
- if (GV->hasPrivateLinkage()) {
- // For a private symbols, keep track of the index inside the
- // private list since it will never go to the symbol table and
- // won't be patched up later.
- PrivateSyms.push_back(GblSym);
- GblSymLookup[GV] = PrivateSyms.size()-1;
- } else {
- // Non private symbol are left with zero indices until they are patched
- // up during the symbol table emition (where the indicies are created).
- SymbolList.push_back(GblSym);
- GblSymLookup[GV] = 0;
- }
+ AddToSymbolList(GblSym);
}
void ELFWriter::EmitGlobalConstantStruct(const ConstantStruct *CVS,
return;
} else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
APInt Val = CFP->getValueAPF().bitcastToAPInt();
- if (CFP->getType() == Type::DoubleTy)
+ if (CFP->getType()->isDoubleTy())
GblS.emitWord64(Val.getZExtValue());
- else if (CFP->getType() == Type::FloatTy)
+ else if (CFP->getType()->isFloatTy())
GblS.emitWord32(Val.getZExtValue());
- else if (CFP->getType() == Type::X86_FP80Ty) {
- unsigned PadSize = TD->getTypeAllocSize(Type::X86_FP80Ty)-
- TD->getTypeStoreSize(Type::X86_FP80Ty);
+ else if (CFP->getType()->isX86_FP80Ty()) {
+ unsigned PadSize = TD->getTypeAllocSize(CFP->getType())-
+ TD->getTypeStoreSize(CFP->getType());
GblS.emitWordFP80(Val.getRawData(), PadSize);
- } else if (CFP->getType() == Type::PPC_FP128Ty)
+ } else if (CFP->getType()->isPPC_FP128Ty())
llvm_unreachable("PPC_FP128Ty global emission not implemented");
return;
} else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
std::string msg;
raw_string_ostream ErrorMsg(msg);
ErrorMsg << "Constant unimp for type: " << *CV->getType();
- llvm_report_error(ErrorMsg.str());
+ report_fatal_error(ErrorMsg.str());
}
// ResolveConstantExpr - Resolve the constant expression until it stop
}
case Instruction::IntToPtr: {
Constant *Op = CE->getOperand(0);
- Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/);
+ Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(CV->getContext()),
+ false/*ZExt*/);
return ResolveConstantExpr(Op);
}
case Instruction::PtrToInt: {
}
}
- std::string msg(CE->getOpcodeName());
- raw_string_ostream ErrorMsg(msg);
- ErrorMsg << ": Unsupported ConstantExpr type";
- llvm_report_error(ErrorMsg.str());
+ report_fatal_error(CE->getOpcodeName() +
+ StringRef(": Unsupported ConstantExpr type"));
return std::make_pair(CV, 0); // silence warning
}
I != E; ++I)
SymbolList.push_back(ELFSym::getExtSym(*I));
- // Emit non-executable stack note
- if (TAI->getNonexecutableStackDirective())
- getNonExecStackSection();
-
// Emit a symbol for each section created until now, skip null section
for (unsigned i = 1, e = SectionList.size(); i < e; ++i) {
ELFSection &ES = *SectionList[i];
// Dump the sections and section table to the .o file.
OutputSectionsAndSectionTable();
- // We are done with the abstract symbols.
- SymbolList.clear();
- SectionList.clear();
- NumSections = 0;
-
- // Release the name mangler object.
- delete Mang; Mang = 0;
return false;
}
ELFSym &Sym = *(*I);
std::string Name;
- if (Sym.isGlobalValue())
- Name.append(Mang->getMangledName(Sym.getGlobalValue()));
- else if (Sym.isExternalSym())
+ if (Sym.isGlobalValue()) {
+ SmallString<40> NameStr;
+ Mang->getNameWithPrefix(NameStr, Sym.getGlobalValue(), false);
+ Name.append(NameStr.begin(), NameStr.end());
+ } else if (Sym.isExternalSym())
Name.append(Sym.getExternalSymbol());
else if (Sym.isFileType())
Name.append(ModuleName);
// Emit all of sections to the file and build the section header table.
for (ELFSectionIter I=SectionList.begin(), E=SectionList.end(); I != E; ++I) {
ELFSection &S = *(*I);
- DOUT << "SectionIdx: " << S.SectionIdx << ", Name: " << S.getName()
- << ", Size: " << S.Size << ", Offset: " << S.Offset
- << ", SectionData Size: " << S.size() << "\n";
+ DEBUG(dbgs() << "SectionIdx: " << S.SectionIdx << ", Name: " << S.getName()
+ << ", Size: " << S.Size << ", Offset: " << S.Offset
+ << ", SectionData Size: " << S.size() << "\n");
// Align FileOff to whatever the alignment restrictions of the section are.
if (S.size()) {
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