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Support Constant Pool Sections

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Add section symbols to the symbol table


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74170 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bruno Cardoso Lopes
2009-06-25 07:36:24 +00:00
parent c9028e69f1
commit a5e0abd0d4
5 changed files with 111 additions and 11 deletions
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41
lib/CodeGen/ELFWriter.cpp
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@@ -389,6 +389,24 @@ bool ELFWriter::doFinalization(Module &M) {
if (TAI->getNonexecutableStackDirective())
getNonExecStackSection();
// Emit a symbol for each section created until now
for (std::map<std::string, ELFSection*>::iterator I = SectionLookup.begin(),
E = SectionLookup.end(); I != E; ++I) {
ELFSection *ES = I->second;
// Skip null section
if (ES->SectionIdx == 0) continue;
ELFSym SectionSym(0);
SectionSym.SectionIdx = ES->SectionIdx;
SectionSym.Size = 0;
SectionSym.setBind(ELFSym::STB_LOCAL);
SectionSym.setType(ELFSym::STT_SECTION);
// Local symbols go in the list front
SymbolList.push_front(SectionSym);
}
// Emit string table
EmitStringTable();
@@ -451,15 +469,25 @@ void ELFWriter::EmitRelocations() {
// Constant addend used to compute the value to be stored
// into the relocatable field
int64_t Addend = TEW->getAddendForRelTy(RelType);
int64_t Addend = 0;
// There are several machine relocations types, and each one of
// them needs a different approach to retrieve the symbol table index.
if (MR.isGlobalValue()) {
const GlobalValue *G = MR.getGlobalValue();
SymIdx = GblSymLookup[G];
Addend = TEW->getAddendForRelTy(RelType);
} else {
assert(0 && "dunno how to handle other relocation types");
unsigned SectionIdx = MR.getConstantVal();
// TODO: use a map for this.
for (std::list<ELFSym>::iterator I = SymbolList.begin(),
E = SymbolList.end(); I != E; ++I)
if ((SectionIdx == I->SectionIdx) &&
(I->getType() == ELFSym::STT_SECTION)) {
SymIdx = I->SymTabIdx;
break;
}
Addend = (uint64_t)MR.getResultPointer();
}
// Get the relocation entry and emit to the relocation section
@@ -540,7 +568,8 @@ void ELFWriter::EmitStringTable() {
E = SymbolList.end(); I != E; ++I) {
// Use the name mangler to uniquify the LLVM symbol.
std::string Name = Mang->getValueName(I->GV);
std::string Name;
if (I->GV) Name.append(Mang->getValueName(I->GV));
if (Name.empty()) {
I->NameIdx = 0;
@@ -589,7 +618,11 @@ void ELFWriter::EmitSymbolTable() {
EmitSymbol(SymTab, *I);
// Record the symbol table index for each global value
GblSymLookup[I->GV] = Index;
if (I->GV)
GblSymLookup[I->GV] = Index;
// Keep track on the symbol index into the symbol table
I->SymTabIdx = Index;
}
SymTab.Info = FirstNonLocalSymbol;