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Handle external symbols for ELF and add some static methods to ELFSym

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77232 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bruno Cardoso Lopes
2009-07-27 18:54:47 +00:00
parent e0f21bd47f
commit 746e3bb354
4 changed files with 155 additions and 46 deletions
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76
lib/CodeGen/ELFWriter.cpp
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@@ -144,6 +144,21 @@ bool ELFWriter::doInitialization(Module &M) {
return false;
}
// addGlobalSymbol - Add a global to be processed and to the
// global symbol lookup, use a zero index for non private symbols
// because the table index will be determined later.
void ELFWriter::addGlobalSymbol(const GlobalValue *GV) {
PendingGlobals.insert(GV);
}
// 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) {
PendingExternals.insert(External);
ExtSymLookup[External] = 0;
}
// Get jump table section on the section name returned by TAI
ELFSection &ELFWriter::getJumpTableSection() {
unsigned Align = TM.getTargetData()->getPointerABIAlignment();
@@ -169,7 +184,7 @@ ELFSection &ELFWriter::getConstantPoolSection(MachineConstantPoolEntry &CPE) {
default: Kind = SectionKind::get(SectionKind::MergeableConst,false); break;
}
}
return getSection(TAI->getSectionForMergeableConstant(Kind)->getName(),
ELFSection::SHT_PROGBITS,
ELFSection::SHF_MERGE | ELFSection::SHF_ALLOC,
@@ -278,12 +293,18 @@ void ELFWriter::EmitGlobal(const GlobalValue *GV) {
if (GblSymLookup.find(GV) != GblSymLookup.end())
return;
// If the global is a function already emited in the text section
// just add it to the global symbol lookup with a zero index to be
// patched up later.
if (isa<Function>(GV) && !GV->isDeclaration()) {
GblSymLookup[GV] = 0;
return;
}
// Handle ELF Bind, Visibility and Type for the current symbol
unsigned SymBind = getGlobalELFBinding(GV);
ELFSym *GblSym = new ELFSym(GV);
GblSym->setBind(SymBind);
GblSym->setVisibility(getGlobalELFVisibility(GV));
GblSym->setType(getGlobalELFType(GV));
ELFSym *GblSym = ELFSym::getGV(GV, SymBind, getGlobalELFType(GV),
getGlobalELFVisibility(GV));
if (isELFUndefSym(GV)) {
GblSym->SectionIdx = ELFSection::SHN_UNDEF;
@@ -341,16 +362,18 @@ void ELFWriter::EmitGlobal(const GlobalValue *GV) {
}
}
// Private symbols must never go to the symbol table.
unsigned SymIdx = 0;
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);
SymIdx = PrivateSyms.size()-1;
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;
}
setGlobalSymLookup(GV, SymIdx);
}
void ELFWriter::EmitGlobalConstantStruct(const ConstantStruct *CVS,
@@ -478,10 +501,15 @@ bool ELFWriter::doFinalization(Module &M) {
EmitGlobal(I);
// Emit all pending globals
for (SetVector<GlobalValue*>::const_iterator I = PendingGlobals.begin(),
E = PendingGlobals.end(); I != E; ++I)
for (PendingGblsIter I = PendingGlobals.begin(), E = PendingGlobals.end();
I != E; ++I)
EmitGlobal(*I);
// Emit all pending externals
for (PendingExtsIter I = PendingExternals.begin(), E = PendingExternals.end();
I != E; ++I)
SymbolList.push_back(ELFSym::getExtSym(*I));
// Emit non-executable stack note
if (TAI->getNonexecutableStackDirective())
getNonExecStackSection();
@@ -489,12 +517,8 @@ bool ELFWriter::doFinalization(Module &M) {
// 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];
ELFSym *SectionSym = new ELFSym(0);
ELFSym *SectionSym = ELFSym::getSectionSym();
SectionSym->SectionIdx = ES.SectionIdx;
SectionSym->Size = 0;
SectionSym->setBind(ELFSym::STB_LOCAL);
SectionSym->setType(ELFSym::STT_SECTION);
SectionSym->setVisibility(ELFSym::STV_DEFAULT);
SymbolList.push_back(SectionSym);
ES.Sym = SymbolList.back();
}
@@ -589,6 +613,10 @@ void ELFWriter::EmitRelocations() {
} else {
Addend = TEW->getDefaultAddendForRelTy(RelType);
}
} else if (MR.isExternalSymbol()) {
const char *ExtSym = MR.getExternalSymbol();
SymIdx = ExtSymLookup[ExtSym];
Addend = TEW->getDefaultAddendForRelTy(RelType);
} else {
// Get the symbol index for the section symbol
unsigned SectionIdx = MR.getConstantVal();
@@ -695,7 +723,10 @@ void ELFWriter::EmitStringTable() {
// Use the name mangler to uniquify the LLVM symbol.
std::string Name;
if (Sym.GV) Name.append(Mang->getMangledName(Sym.GV));
if (Sym.isGlobalValue())
Name.append(Mang->getMangledName(Sym.getGlobalValue()));
else if (Sym.isExternalSym())
Name.append(Sym.getExternalSymbol());
if (Name.empty()) {
Sym.NameIdx = 0;
@@ -755,7 +786,7 @@ void ELFWriter::EmitSymbolTable() {
SymTab.EntSize = TEW->getSymTabEntrySize();
// The first entry in the symtab is the null symbol
SymbolList.insert(SymbolList.begin(), new ELFSym(0));
SymbolList.insert(SymbolList.begin(), new ELFSym());
// Reorder the symbol table with local symbols first!
unsigned FirstNonLocalSymbol = SortSymbols();
@@ -767,8 +798,11 @@ void ELFWriter::EmitSymbolTable() {
// Emit symbol to the symbol table
EmitSymbol(SymTab, Sym);
// Record the symbol table index for each global value
if (Sym.GV) setGlobalSymLookup(Sym.GV, i);
// Record the symbol table index for each symbol
if (Sym.isGlobalValue())
GblSymLookup[Sym.getGlobalValue()] = i;
else if (Sym.isExternalSym())
ExtSymLookup[Sym.getExternalSymbol()] = i;
// Keep track on the symbol index into the symbol table
Sym.SymTabIdx = i;