std::pair<unsigned, unsigned>
RuntimeDyldImpl::loadObjectImpl(const object::ObjectFile &Obj) {
MutexGuard locked(lock);
// Grab the first Section ID. We'll use this later to construct the underlying
// range for the returned LoadedObjectInfo.
unsigned SectionsAddedBeginIdx = Sections.size();
// Save information about our target
Arch = (Triple::ArchType)Obj.getArch();
IsTargetLittleEndian = Obj.isLittleEndian();
// Compute the memory size required to load all sections to be loaded
// and pass this information to the memory manager
if (MemMgr->needsToReserveAllocationSpace()) {
uint64_t CodeSize = 0, DataSizeRO = 0, DataSizeRW = 0;
computeTotalAllocSize(Obj, CodeSize, DataSizeRO, DataSizeRW);
MemMgr->reserveAllocationSpace(CodeSize, DataSizeRO, DataSizeRW);
}
// Used sections from the object file
ObjSectionToIDMap LocalSections;
// Common symbols requiring allocation, with their sizes and alignments
CommonSymbolMap CommonSymbols;
// Maximum required total memory to allocate all common symbols
uint64_t CommonSize = 0;
// Parse symbols
DEBUG(dbgs() << "Parse symbols:\n");
for (symbol_iterator I = Obj.symbol_begin(), E = Obj.symbol_end(); I != E;
++I) {
object::SymbolRef::Type SymType;
StringRef Name;
Check(I->getType(SymType));
Check(I->getName(Name));
uint32_t Flags = I->getFlags();
bool IsCommon = Flags & SymbolRef::SF_Common;
if (IsCommon) {
// Add the common symbols to a list. We'll allocate them all below.
if (!GlobalSymbolTable.count(Name)) {
uint32_t Align;
Check(I->getAlignment(Align));
uint64_t Size = 0;
Check(I->getSize(Size));
CommonSize += Size + Align;
CommonSymbols[*I] = CommonSymbolInfo(Size, Align);
}
} else {
if (SymType == object::SymbolRef::ST_Function ||
SymType == object::SymbolRef::ST_Data ||
SymType == object::SymbolRef::ST_Unknown) {
uint64_t SectOffset;
StringRef SectionData;
section_iterator SI = Obj.section_end();
Check(getOffset(*I, SectOffset));
Check(I->getSection(SI));
if (SI == Obj.section_end())
continue;
Check(SI->getContents(SectionData));
bool IsCode = SI->isText();
unsigned SectionID =
findOrEmitSection(Obj, *SI, IsCode, LocalSections);
DEBUG(dbgs() << "\tOffset: " << format("%p", (uintptr_t)SectOffset)
<< " flags: " << Flags << " SID: " << SectionID);
GlobalSymbolTable[Name] = SymbolLoc(SectionID, SectOffset);
}
}
DEBUG(dbgs() << "\tType: " << SymType << " Name: " << Name << "\n");
}
// Allocate common symbols
if (CommonSize != 0)
emitCommonSymbols(Obj, CommonSymbols, CommonSize, GlobalSymbolTable);
// Parse and process relocations
DEBUG(dbgs() << "Parse relocations:\n");
for (section_iterator SI = Obj.section_begin(), SE = Obj.section_end();
SI != SE; ++SI) {
unsigned SectionID = 0;
StubMap Stubs;
section_iterator RelocatedSection = SI->getRelocatedSection();
relocation_iterator I = SI->relocation_begin();
relocation_iterator E = SI->relocation_end();
if (I == E && !ProcessAllSections)
continue;
bool IsCode = RelocatedSection->isText();
SectionID =
findOrEmitSection(Obj, *RelocatedSection, IsCode, LocalSections);
DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n");
for (; I != E;)
I = processRelocationRef(SectionID, I, Obj, LocalSections, Stubs);
// If there is an attached checker, notify it about the stubs for this
// section so that they can be verified.
if (Checker)
Checker->registerStubMap(Obj.getFileName(), SectionID, Stubs);
}
// Give the subclasses a chance to tie-up any loose ends.
finalizeLoad(Obj, LocalSections);
unsigned SectionsAddedEndIdx = Sections.size();
return std::make_pair(SectionsAddedBeginIdx, SectionsAddedEndIdx);
}
std::pair<unsigned, unsigned>
RuntimeDyldImpl::loadObjectImpl(const object::ObjectFile &Obj) {
MutexGuard locked(lock);
// Grab the first Section ID. We'll use this later to construct the underlying
// range for the returned LoadedObjectInfo.
unsigned SectionsAddedBeginIdx = Sections.size();
// Save information about our target
Arch = (Triple::ArchType)Obj.getArch();
IsTargetLittleEndian = Obj.isLittleEndian();
// Compute the memory size required to load all sections to be loaded
// and pass this information to the memory manager
if (MemMgr->needsToReserveAllocationSpace()) {
uint64_t CodeSize = 0, DataSizeRO = 0, DataSizeRW = 0;
computeTotalAllocSize(Obj, CodeSize, DataSizeRO, DataSizeRW);
MemMgr->reserveAllocationSpace(CodeSize, DataSizeRO, DataSizeRW);
}
// Used sections from the object file
ObjSectionToIDMap LocalSections;
// Common symbols requiring allocation, with their sizes and alignments
CommonSymbolList CommonSymbols;
// Parse symbols
DEBUG(dbgs() << "Parse symbols:\n");
for (symbol_iterator I = Obj.symbol_begin(), E = Obj.symbol_end(); I != E;
++I) {
uint32_t Flags = I->getFlags();
bool IsCommon = Flags & SymbolRef::SF_Common;
bool IsWeak = Flags & SymbolRef::SF_Weak;
if (IsCommon) {
CommonSymbols.push_back(*I);
} else {
object::SymbolRef::Type SymType;
Check(I->getType(SymType));
if (SymType == object::SymbolRef::ST_Function ||
SymType == object::SymbolRef::ST_Data ||
SymType == object::SymbolRef::ST_Unknown) {
StringRef Name;
uint64_t SectOffset;
Check(I->getName(Name));
Check(getOffset(*I, SectOffset));
section_iterator SI = Obj.section_end();
Check(I->getSection(SI));
if (SI == Obj.section_end())
continue;
StringRef SectionData;
Check(SI->getContents(SectionData));
// TODO: It make make sense to delay emitting the section for weak
// symbols until they are actually required, but that's not possible
// currently, because we only know whether we will need the symbol
// in resolveRelocations, which happens after we have already finalized
// the Load.
bool IsCode = SI->isText();
unsigned SectionID =
findOrEmitSection(Obj, *SI, IsCode, LocalSections);
DEBUG(dbgs() << "\tType: " << SymType << " Name: " << Name
<< " SID: " << SectionID << " Offset: "
<< format("%p", (uintptr_t)SectOffset)
<< " flags: " << Flags << "\n");
SymbolInfo::Visibility Vis =
(Flags & SymbolRef::SF_Exported) ?
SymbolInfo::Default : SymbolInfo::Hidden;
if (!IsWeak)
{
GlobalSymbolTable[Name] = SymbolInfo(SectionID, SectOffset, Vis);
} else {
WeakSymbolTable[Name] = SymbolInfo(SectionID, SectOffset, Vis);
}
}
}
}
// Allocate common symbols
emitCommonSymbols(Obj, CommonSymbols);
// Parse and process relocations
DEBUG(dbgs() << "Parse relocations:\n");
for (section_iterator SI = Obj.section_begin(), SE = Obj.section_end();
SI != SE; ++SI) {
unsigned SectionID = 0;
StubMap Stubs;
section_iterator RelocatedSection = SI->getRelocatedSection();
relocation_iterator I = SI->relocation_begin();
relocation_iterator E = SI->relocation_end();
if (I == E && !ProcessAllSections)
continue;
bool IsCode = RelocatedSection->isText();
SectionID =
findOrEmitSection(Obj, *RelocatedSection, IsCode, LocalSections);
DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n");
for (; I != E;)
I = processRelocationRef(SectionID, I, Obj, LocalSections, Stubs);
// If there is an attached checker, notify it about the stubs for this
// section so that they can be verified.
if (Checker)
Checker->registerStubMap(Obj.getFileName(), SectionID, Stubs);
}
// Give the subclasses a chance to tie-up any loose ends.
finalizeLoad(Obj, LocalSections);
unsigned SectionsAddedEndIdx = Sections.size();
return std::make_pair(SectionsAddedBeginIdx, SectionsAddedEndIdx);
}