6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-08-05 13:26:55 +00:00
Code Issues Projects Releases Wiki Activity

Re-factored RuntimeDyld.

Browse Source 
Added ExecutionEngine/MCJIT tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153694 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Danil Malyshev
2012-03-29 21:46:18 +00:00
parent 6c31ee2b10
commit 4b0b8ef1b0
57 changed files with 1820 additions and 1065 deletions
Download Patch File Download Diff File Expand all files Collapse all files

295
lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
View File

@@ -26,45 +26,290 @@ RuntimeDyldImpl::~RuntimeDyldImpl() {}
namespace llvm {
void RuntimeDyldImpl::extractFunction(StringRef Name, uint8_t *StartAddress,
uint8_t *EndAddress) {
// FIXME: DEPRECATED in favor of by-section allocation.
// Allocate memory for the function via the memory manager.
uintptr_t Size = EndAddress - StartAddress + 1;
uintptr_t AllocSize = Size;
uint8_t *Mem = MemMgr->startFunctionBody(Name.data(), AllocSize);
assert(Size >= (uint64_t)(EndAddress - StartAddress + 1) &&
"Memory manager failed to allocate enough memory!");
// Copy the function payload into the memory block.
memcpy(Mem, StartAddress, Size);
MemMgr->endFunctionBody(Name.data(), Mem, Mem + Size);
// Remember where we put it.
unsigned SectionID = Sections.size();
Sections.push_back(sys::MemoryBlock(Mem, Size));
namespace {
// Helper for extensive error checking in debug builds.
error_code Check(error_code Err) {
if (Err) {
report_fatal_error(Err.message());
}
return Err;
}
} // end anonymous namespace
// Default the assigned address for this symbol to wherever this
// allocated it.
SymbolTable[Name] = SymbolLoc(SectionID, 0);
DEBUG(dbgs() << " allocated to [" << Mem << ", " << Mem + Size << "]\n");
}
// Resolve the relocations for all symbols we currently know about.
void RuntimeDyldImpl::resolveRelocations() {
// First, resolve relocations assotiated with external symbols.
resolveSymbols();
// Just iterate over the sections we have and resolve all the relocations
// in them. Gross overkill, but it gets the job done.
for (int i = 0, e = Sections.size(); i != e; ++i) {
reassignSectionAddress(i, SectionLoadAddress[i]);
reassignSectionAddress(i, Sections[i].LoadAddress);
}
}
void RuntimeDyldImpl::mapSectionAddress(void *LocalAddress,
uint64_t TargetAddress) {
assert(SectionLocalMemToID.count(LocalAddress) &&
"Attempting to remap address of unknown section!");
unsigned SectionID = SectionLocalMemToID[LocalAddress];
reassignSectionAddress(SectionID, TargetAddress);
for (unsigned i = 0, e = Sections.size(); i != e; ++i) {
if (Sections[i].Address == LocalAddress) {
reassignSectionAddress(i, TargetAddress);
return;
}
}
llvm_unreachable("Attempting to remap address of unknown section!");
}
bool RuntimeDyldImpl::loadObject(const MemoryBuffer *InputBuffer) {
// FIXME: ObjectFile don't modify MemoryBuffer.
// It should use const MemoryBuffer as parameter.
ObjectFile *obj
= ObjectFile::createObjectFile(const_cast<MemoryBuffer*>(InputBuffer));
Arch = (Triple::ArchType)obj->getArch();
LocalSymbolMap LocalSymbols; // Functions and data symbols from the
// object file.
ObjSectionToIDMap LocalSections; // Used sections from the object file
error_code err;
// Parse symbols
DEBUG(dbgs() << "Parse symbols:\n");
for (symbol_iterator i = obj->begin_symbols(), e = obj->end_symbols();
i != e; i.increment(err)) {
Check(err);
object::SymbolRef::Type SymType;
StringRef Name;
Check(i->getType(SymType));
Check(i->getName(Name));
if (SymType == object::SymbolRef::ST_Function ||
SymType == object::SymbolRef::ST_Data) {
uint64_t FileOffset;
uint32_t flags;
StringRef sData;
section_iterator si = obj->end_sections();
Check(i->getFileOffset(FileOffset));
Check(i->getFlags(flags));
Check(i->getSection(si));
if (si == obj->end_sections()) continue;
Check(si->getContents(sData));
const uint8_t* SymPtr = (const uint8_t*)InputBuffer->getBufferStart() +
(uintptr_t)FileOffset;
uintptr_t SectOffset = (uintptr_t)(SymPtr - (const uint8_t*)sData.begin());
unsigned SectionID
= findOrEmitSection(*si,
SymType == object::SymbolRef::ST_Function,
LocalSections);
bool isGlobal = flags & SymbolRef::SF_Global;
LocalSymbols[Name.data()] = SymbolLoc(SectionID, SectOffset);
DEBUG(dbgs() << "\tFileOffset: " << format("%p", (uintptr_t)FileOffset)
<< " flags: " << flags
<< " SID: " << SectionID
<< " Offset: " << format("%p", SectOffset));
if (isGlobal)
SymbolTable[Name] = SymbolLoc(SectionID, SectOffset);
}
DEBUG(dbgs() << "\tType: " << SymType << " Name: " << Name << "\n");
}
// Parse and proccess relocations
DEBUG(dbgs() << "Parse relocations:\n");
for (section_iterator si = obj->begin_sections(),
se = obj->end_sections(); si != se; si.increment(err)) {
Check(err);
bool isFirstRelocation = true;
unsigned SectionID = 0;
StubMap Stubs;
for (relocation_iterator i = si->begin_relocations(),
e = si->end_relocations(); i != e; i.increment(err)) {
Check(err);
// If it's first relocation in this section, find its SectionID
if (isFirstRelocation) {
SectionID = findOrEmitSection(*si, true, LocalSections);
DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n");
isFirstRelocation = false;
}
ObjRelocationInfo RI;
RI.SectionID = SectionID;
Check(i->getAdditionalInfo(RI.AdditionalInfo));
Check(i->getOffset(RI.Offset));
Check(i->getSymbol(RI.Symbol));
Check(i->getType(RI.Type));
DEBUG(dbgs() << "\t\tAddend: " << RI.AdditionalInfo
<< " Offset: " << format("%p", (uintptr_t)RI.Offset)
<< " Type: " << (uint32_t)(RI.Type & 0xffffffffL)
<< "\n");
processRelocationRef(RI, *obj, LocalSections, LocalSymbols, Stubs);
}
}
return false;
}
unsigned RuntimeDyldImpl::emitSection(const SectionRef &Section,
bool IsCode) {
unsigned StubBufSize = 0,
StubSize = getMaxStubSize();
error_code err;
if (StubSize > 0) {
for (relocation_iterator i = Section.begin_relocations(),
e = Section.end_relocations(); i != e; i.increment(err))
StubBufSize += StubSize;
}
StringRef data;
uint64_t Alignment64;
Check(Section.getContents(data));
Check(Section.getAlignment(Alignment64));
unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
unsigned DataSize = data.size();
unsigned Allocate = DataSize + StubBufSize;
unsigned SectionID = Sections.size();
const char *pData = data.data();
uint8_t *Addr = IsCode
? MemMgr->allocateCodeSection(Allocate, Alignment, SectionID)
: MemMgr->allocateDataSection(Allocate, Alignment, SectionID);
memcpy(Addr, pData, DataSize);
DEBUG(dbgs() << "emitSection SectionID: " << SectionID
<< " obj addr: " << format("%p", pData)
<< " new addr: " << format("%p", Addr)
<< " DataSize: " << DataSize
<< " StubBufSize: " << StubBufSize
<< " Allocate: " << Allocate
<< "\n");
Sections.push_back(SectionEntry(Addr, Allocate, DataSize,(uintptr_t)pData));
return SectionID;
}
unsigned RuntimeDyldImpl::findOrEmitSection(const SectionRef &Section,
bool IsCode,
ObjSectionToIDMap &LocalSections) {
unsigned SectionID = 0;
ObjSectionToIDMap::iterator i = LocalSections.find(Section);
if (i != LocalSections.end())
SectionID = i->second;
else {
SectionID = emitSection(Section, IsCode);
LocalSections[Section] = SectionID;
}
return SectionID;
}
void RuntimeDyldImpl::AddRelocation(const RelocationValueRef &Value,
unsigned SectionID, uintptr_t Offset,
uint32_t RelType) {
DEBUG(dbgs() << "AddRelocation SymNamePtr: " << format("%p", Value.SymbolName)
<< " SID: " << Value.SectionID
<< " Addend: " << format("%p", Value.Addend)
<< " Offset: " << format("%p", Offset)
<< " RelType: " << format("%x", RelType)
<< "\n");
if (Value.SymbolName == 0) {
Relocations[Value.SectionID].push_back(RelocationEntry(
SectionID,
Offset,
RelType,
Value.Addend));
} else
SymbolRelocations[Value.SymbolName].push_back(RelocationEntry(
SectionID,
Offset,
RelType,
Value.Addend));
}
uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr) {
// TODO: There is only ARM far stub now. We should add the Thumb stub,
// and stubs for branches Thumb - ARM and ARM - Thumb.
if (Arch == Triple::arm) {
uint32_t *StubAddr = (uint32_t*)Addr;
*StubAddr = 0xe51ff004; // ldr pc,<label>
return (uint8_t*)++StubAddr;
}
else
return Addr;
}
// Assign an address to a symbol name and resolve all the relocations
// associated with it.
void RuntimeDyldImpl::reassignSectionAddress(unsigned SectionID,
uint64_t Addr) {
// The address to use for relocation resolution is not
// the address of the local section buffer. We must be doing
// a remote execution environment of some sort. Re-apply any
// relocations referencing this section with the given address.
//
// Addr is a uint64_t because we can't assume the pointer width
// of the target is the same as that of the host. Just use a generic
// "big enough" type.
Sections[SectionID].LoadAddress = Addr;
DEBUG(dbgs() << "Resolving relocations Section #" << SectionID
<< "\t" << format("%p", (uint8_t *)Addr)
<< "\n");
resolveRelocationList(Relocations[SectionID], Addr);
}
void RuntimeDyldImpl::resolveRelocationEntry(const RelocationEntry &RE,
uint64_t Value) {
uint8_t *Target = Sections[RE.SectionID].Address + RE.Offset;
DEBUG(dbgs() << "\tSectionID: " << RE.SectionID
<< " + " << RE.Offset << " (" << format("%p", Target) << ")"
<< " Data: " << RE.Data
<< " Addend: " << RE.Addend
<< "\n");
resolveRelocation(Target, Sections[RE.SectionID].LoadAddress + RE.Offset,
Value, RE.Data, RE.Addend);
}
void RuntimeDyldImpl::resolveRelocationList(const RelocationList &Relocs,
uint64_t Value) {
for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
resolveRelocationEntry(Relocs[i], Value);
}
}
// resolveSymbols - Resolve any relocations to the specified symbols if
// we know where it lives.
void RuntimeDyldImpl::resolveSymbols() {
StringMap<RelocationList>::iterator i = SymbolRelocations.begin(),
e = SymbolRelocations.end();
for (; i != e; i++) {
StringRef Name = i->first();
RelocationList &Relocs = i->second;
StringMap<SymbolLoc>::const_iterator Loc = SymbolTable.find(Name);
if (Loc == SymbolTable.end()) {
// This is an external symbol, try to get it address from
// MemoryManager.
uint8_t *Addr = (uint8_t*) MemMgr->getPointerToNamedFunction(Name.data(),
true);
DEBUG(dbgs() << "Resolving relocations Name: " << Name
<< "\t" << format("%p", Addr)
<< "\n");
resolveRelocationList(Relocs, (uintptr_t)Addr);
} else {
// Change the relocation to be section relative rather than symbol
// relative and move it to the resolved relocation list.
DEBUG(dbgs() << "Resolving symbol '" << Name << "'\n");
for (int i = 0, e = Relocs.size(); i != e; ++i) {
RelocationEntry Entry = Relocs[i];
Entry.Addend += Loc->second.second;
Relocations[Loc->second.first].push_back(Entry);
}
Relocs.clear();
}
}
}
//===----------------------------------------------------------------------===//
// RuntimeDyld class implementation
RuntimeDyld::RuntimeDyld(RTDyldMemoryManager *mm) {

405
lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
View File

@@ -25,222 +25,58 @@ using namespace llvm::object;
namespace llvm {
namespace {
// FIXME: this function should probably not live here...
//
// Returns the name and address of an unrelocated symbol in an ELF section
void getSymbolInfo(symbol_iterator Sym, uint64_t &Addr, StringRef &Name) {
//FIXME: error checking here required to catch corrupt ELF objects...
error_code Err = Sym->getName(Name);
uint64_t AddrInSection;
Err = Sym->getAddress(AddrInSection);
SectionRef empty_section;
section_iterator Section(empty_section);
Err = Sym->getSection(Section);
StringRef SectionContents;
Section->getContents(SectionContents);
Addr = reinterpret_cast<uint64_t>(SectionContents.data()) + AddrInSection;
}
}
bool RuntimeDyldELF::loadObject(MemoryBuffer *InputBuffer) {
if (!isCompatibleFormat(InputBuffer))
return true;
OwningPtr<ObjectFile> Obj(ObjectFile::createELFObjectFile(InputBuffer));
Arch = Obj->getArch();
// Map address in the Object file image to function names
IntervalMap<uint64_t, StringRef>::Allocator A;
IntervalMap<uint64_t, StringRef> FuncMap(A);
// This is a bit of a hack. The ObjectFile we've just loaded reports
// section addresses as 0 and doesn't provide access to the section
// offset (from which we could calculate the address. Instead,
// we're storing the address when it comes up in the ST_Debug case
// below.
//
StringMap<uint64_t> DebugSymbolMap;
symbol_iterator SymEnd = Obj->end_symbols();
error_code Err;
for (symbol_iterator Sym = Obj->begin_symbols();
Sym != SymEnd; Sym.increment(Err)) {
SymbolRef::Type Type;
Sym->getType(Type);
if (Type == SymbolRef::ST_Function) {
StringRef Name;
uint64_t Addr;
getSymbolInfo(Sym, Addr, Name);
uint64_t Size;
Err = Sym->getSize(Size);
uint8_t *Start;
uint8_t *End;
Start = reinterpret_cast<uint8_t*>(Addr);
End = reinterpret_cast<uint8_t*>(Addr + Size - 1);
extractFunction(Name, Start, End);
FuncMap.insert(Addr, Addr + Size - 1, Name);
} else if (Type == SymbolRef::ST_Debug) {
// This case helps us find section addresses
StringRef Name;
uint64_t Addr;
getSymbolInfo(Sym, Addr, Name);
DebugSymbolMap[Name] = Addr;
}
}
// Iterate through the relocations for this object
section_iterator SecEnd = Obj->end_sections();
for (section_iterator Sec = Obj->begin_sections();
Sec != SecEnd; Sec.increment(Err)) {
StringRef SecName;
uint64_t SecAddr;
Sec->getName(SecName);
// Ignore sections that aren't in our map
if (DebugSymbolMap.find(SecName) == DebugSymbolMap.end()) {
continue;
}
SecAddr = DebugSymbolMap[SecName];
relocation_iterator RelEnd = Sec->end_relocations();
for (relocation_iterator Rel = Sec->begin_relocations();
Rel != RelEnd; Rel.increment(Err)) {
uint64_t RelOffset;
uint64_t RelType;
int64_t RelAddend;
SymbolRef RelSym;
StringRef SymName;
uint64_t SymAddr;
uint64_t SymOffset;
Rel->getAddress(RelOffset);
Rel->getType(RelType);
Rel->getAdditionalInfo(RelAddend);
Rel->getSymbol(RelSym);
RelSym.getName(SymName);
RelSym.getAddress(SymAddr);
RelSym.getFileOffset(SymOffset);
// If this relocation is inside a function, we want to store the
// function name and a function-relative offset
IntervalMap<uint64_t, StringRef>::iterator ContainingFunc
= FuncMap.find(SecAddr + RelOffset);
if (ContainingFunc.valid()) {
// Re-base the relocation to make it relative to the target function
RelOffset = (SecAddr + RelOffset) - ContainingFunc.start();
Relocations[SymName].push_back(RelocationEntry(ContainingFunc.value(),
RelOffset,
RelType,
RelAddend,
true));
} else {
Relocations[SymName].push_back(RelocationEntry(SecName,
RelOffset,
RelType,
RelAddend,
false));
}
}
}
return false;
}
void RuntimeDyldELF::resolveRelocations() {
// FIXME: deprecated. should be changed to use the by-section
// allocation and relocation scheme.
// Just iterate over the symbols in our symbol table and assign their
// addresses.
StringMap<SymbolLoc>::iterator i = SymbolTable.begin();
StringMap<SymbolLoc>::iterator e = SymbolTable.end();
for (;i != e; ++i) {
assert (i->getValue().second == 0 && "non-zero offset in by-function sym!");
reassignSymbolAddress(i->getKey(),
(uint8_t*)Sections[i->getValue().first].base());
}
}
void RuntimeDyldELF::resolveX86_64Relocation(StringRef Name,
uint8_t *Addr,
const RelocationEntry &RE) {
uint8_t *TargetAddr;
if (RE.IsFunctionRelative) {
StringMap<SymbolLoc>::const_iterator Loc = SymbolTable.find(RE.Target);
assert(Loc != SymbolTable.end() && "Function for relocation not found");
TargetAddr =
reinterpret_cast<uint8_t*>(Sections[Loc->second.first].base()) +
Loc->second.second + RE.Offset;
} else {
// FIXME: Get the address of the target section and add that to RE.Offset
llvm_unreachable("Non-function relocation not implemented yet!");
}
switch (RE.Type) {
default: llvm_unreachable("Relocation type not implemented yet!");
void RuntimeDyldELF::resolveX86_64Relocation(uint8_t *LocalAddress,
uint64_t FinalAddress,
uint64_t Value,
uint32_t Type,
int64_t Addend) {
switch (Type) {
default:
llvm_unreachable("Relocation type not implemented yet!");
break;
case ELF::R_X86_64_64: {
uint8_t **Target = reinterpret_cast<uint8_t**>(TargetAddr);
*Target = Addr + RE.Addend;
uint64_t *Target = (uint64_t*)(LocalAddress);
*Target = Value + Addend;
break;
}
case ELF::R_X86_64_32:
case ELF::R_X86_64_32S: {
uint64_t Value = reinterpret_cast<uint64_t>(Addr) + RE.Addend;
Value += Addend;
// FIXME: Handle the possibility of this assertion failing
assert((RE.Type == ELF::R_X86_64_32 && !(Value & 0xFFFFFFFF00000000ULL)) ||
(RE.Type == ELF::R_X86_64_32S &&
assert((Type == ELF::R_X86_64_32 && !(Value & 0xFFFFFFFF00000000ULL)) ||
(Type == ELF::R_X86_64_32S &&
(Value & 0xFFFFFFFF00000000ULL) == 0xFFFFFFFF00000000ULL));
uint32_t TruncatedAddr = (Value & 0xFFFFFFFF);
uint32_t *Target = reinterpret_cast<uint32_t*>(TargetAddr);
uint32_t *Target = reinterpret_cast<uint32_t*>(LocalAddress);
*Target = TruncatedAddr;
break;
}
case ELF::R_X86_64_PC32: {
uint32_t *Placeholder = reinterpret_cast<uint32_t*>(TargetAddr);
uint64_t RealOffset = *Placeholder +
reinterpret_cast<uint64_t>(Addr) +
RE.Addend - reinterpret_cast<uint64_t>(TargetAddr);
assert((RealOffset & 0xFFFFFFFF) == RealOffset);
uint32_t TruncOffset = (RealOffset & 0xFFFFFFFF);
uint32_t *Placeholder = reinterpret_cast<uint32_t*>(LocalAddress);
int64_t RealOffset = *Placeholder + Value + Addend - FinalAddress;
assert(RealOffset <= 214783647 && RealOffset >= -214783648);
int32_t TruncOffset = (RealOffset & 0xFFFFFFFF);
*Placeholder = TruncOffset;
break;
}
}
}
void RuntimeDyldELF::resolveX86Relocation(StringRef Name,
uint8_t *Addr,
const RelocationEntry &RE) {
uint8_t *TargetAddr;
if (RE.IsFunctionRelative) {
StringMap<SymbolLoc>::const_iterator Loc = SymbolTable.find(RE.Target);
assert(Loc != SymbolTable.end() && "Function for relocation not found");
TargetAddr =
reinterpret_cast<uint8_t*>(Sections[Loc->second.first].base()) +
Loc->second.second + RE.Offset;
} else {
// FIXME: Get the address of the target section and add that to RE.Offset
llvm_unreachable("Non-function relocation not implemented yet!");
}
switch (RE.Type) {
void RuntimeDyldELF::resolveX86Relocation(uint8_t *LocalAddress,
uint32_t FinalAddress,
uint32_t Value,
uint32_t Type,
int32_t Addend) {
switch (Type) {
case ELF::R_386_32: {
uint8_t **Target = reinterpret_cast<uint8_t**>(TargetAddr);
*Target = Addr + RE.Addend;
uint32_t *Target = (uint32_t*)(LocalAddress);
*Target = Value + Addend;
break;
}
case ELF::R_386_PC32: {
uint32_t *Placeholder = reinterpret_cast<uint32_t*>(TargetAddr);
uint32_t RealOffset = *Placeholder + reinterpret_cast<uintptr_t>(Addr) +
RE.Addend - reinterpret_cast<uintptr_t>(TargetAddr);
uint32_t *Placeholder = reinterpret_cast<uint32_t*>(LocalAddress);
uint32_t RealOffset = *Placeholder + Value + Addend - FinalAddress;
*Placeholder = RealOffset;
break;
}
@@ -248,57 +84,174 @@ void RuntimeDyldELF::resolveX86Relocation(StringRef Name,
// There are other relocation types, but it appears these are the
// only ones currently used by the LLVM ELF object writer
llvm_unreachable("Relocation type not implemented yet!");
break;
}
}
void RuntimeDyldELF::resolveArmRelocation(StringRef Name,
uint8_t *Addr,
const RelocationEntry &RE) {
void RuntimeDyldELF::resolveARMRelocation(uint8_t *LocalAddress,
uint32_t FinalAddress,
uint32_t Value,
uint32_t Type,
int32_t Addend) {
// TODO: Add Thumb relocations.
uint32_t* TargetPtr = (uint32_t*)LocalAddress;
Value += Addend;
DEBUG(dbgs() << "resolveARMRelocation, LocalAddress: " << LocalAddress
<< " FinalAddress: " << format("%p",FinalAddress)
<< " Value: " << format("%x",Value)
<< " Type: " << format("%x",Type)
<< " Addend: " << format("%x",Addend)
<< "\n");
switch(Type) {
default:
llvm_unreachable("Not implemented relocation type!");
// Just write 32bit value to relocation address
case ELF::R_ARM_ABS32 :
*TargetPtr = Value;
break;
// Write first 16 bit of 32 bit value to the mov instruction.
// Last 4 bit should be shifted.
case ELF::R_ARM_MOVW_ABS_NC :
Value = Value & 0xFFFF;
*TargetPtr |= Value & 0xFFF;
*TargetPtr |= ((Value >> 12) & 0xF) << 16;
break;
// Write last 16 bit of 32 bit value to the mov instruction.
// Last 4 bit should be shifted.
case ELF::R_ARM_MOVT_ABS :
Value = (Value >> 16) & 0xFFFF;
*TargetPtr |= Value & 0xFFF;
*TargetPtr |= ((Value >> 12) & 0xF) << 16;
break;
// Write 24 bit relative value to the branch instruction.
case ELF::R_ARM_PC24 : // Fall through.
case ELF::R_ARM_CALL : // Fall through.
case ELF::R_ARM_JUMP24 :
int32_t RelValue = static_cast<int32_t>(Value - FinalAddress - 8);
RelValue = (RelValue & 0x03FFFFFC) >> 2;
*TargetPtr &= 0xFF000000;
*TargetPtr |= RelValue;
break;
}
}
void RuntimeDyldELF::resolveRelocation(StringRef Name,
uint8_t *Addr,
const RelocationEntry &RE) {
void RuntimeDyldELF::resolveRelocation(uint8_t *LocalAddress,
uint64_t FinalAddress,
uint64_t Value,
uint32_t Type,
int64_t Addend) {
switch (Arch) {
case Triple::x86_64:
resolveX86_64Relocation(Name, Addr, RE);
resolveX86_64Relocation(LocalAddress, FinalAddress, Value, Type, Addend);
break;
case Triple::x86:
resolveX86Relocation(Name, Addr, RE);
resolveX86Relocation(LocalAddress, (uint32_t)(FinalAddress & 0xffffffffL),
(uint32_t)(Value & 0xffffffffL), Type,
(uint32_t)(Addend & 0xffffffffL));
break;
case Triple::arm:
resolveArmRelocation(Name, Addr, RE);
case Triple::arm: // Fall through.
case Triple::thumb:
resolveARMRelocation(LocalAddress, (uint32_t)(FinalAddress & 0xffffffffL),
(uint32_t)(Value & 0xffffffffL), Type,
(uint32_t)(Addend & 0xffffffffL));
break;
default: llvm_unreachable("Unsupported CPU type!");
}
}
void RuntimeDyldELF::reassignSymbolAddress(StringRef Name, uint8_t *Addr) {
// FIXME: deprecated. switch to reassignSectionAddress() instead.
//
// Actually moving the symbol address requires by-section mapping.
assert(Sections[SymbolTable.lookup(Name).first].base() == (void*)Addr &&
"Unable to relocate section in by-function JIT allocation model!");
void RuntimeDyldELF::processRelocationRef(const ObjRelocationInfo &Rel,
const ObjectFile &Obj,
ObjSectionToIDMap &ObjSectionToID,
LocalSymbolMap &Symbols,
StubMap &Stubs) {
RelocationList &Relocs = Relocations[Name];
for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
RelocationEntry &RE = Relocs[i];
resolveRelocation(Name, Addr, RE);
uint32_t RelType = (uint32_t)(Rel.Type & 0xffffffffL);
intptr_t Addend = (intptr_t)Rel.AdditionalInfo;
RelocationValueRef Value;
StringRef TargetName;
const SymbolRef &Symbol = Rel.Symbol;
Symbol.getName(TargetName);
DEBUG(dbgs() << "\t\tRelType: " << RelType
<< " Addend: " << Addend
<< " TargetName: " << TargetName
<< "\n");
// First look the symbol in object file symbols.
LocalSymbolMap::iterator lsi = Symbols.find(TargetName.data());
if (lsi != Symbols.end()) {
Value.SectionID = lsi->second.first;
Value.Addend = lsi->second.second;
} else {
// Second look the symbol in global symbol table.
StringMap<SymbolLoc>::iterator gsi = SymbolTable.find(TargetName.data());
if (gsi != SymbolTable.end()) {
Value.SectionID = gsi->second.first;
Value.Addend = gsi->second.second;
} else {
SymbolRef::Type SymType;
Symbol.getType(SymType);
switch (SymType) {
case SymbolRef::ST_Debug: {
// TODO: Now ELF SymbolRef::ST_Debug = STT_SECTION, it's not obviously
// and can be changed by another developers. Maybe best way is add
// a new symbol type ST_Section to SymbolRef and use it.
section_iterator si = Obj.end_sections();
Symbol.getSection(si);
if (si == Obj.end_sections())
llvm_unreachable("Symbol section not found, bad object file format!");
DEBUG(dbgs() << "\t\tThis is section symbol\n");
Value.SectionID = findOrEmitSection((*si), true, ObjSectionToID);
Value.Addend = Addend;
break;
}
case SymbolRef::ST_Unknown: {
Value.SymbolName = TargetName.data();
Value.Addend = Addend;
break;
}
default:
llvm_unreachable("Unresolved symbol type!");
break;
}
}
}
}
DEBUG(dbgs() << "\t\tRel.SectionID: " << Rel.SectionID
<< " Rel.Offset: " << Rel.Offset
<< "\n");
if (Arch == Triple::arm &&
(RelType == ELF::R_ARM_PC24 ||
RelType == ELF::R_ARM_CALL ||
RelType == ELF::R_ARM_JUMP24)) {
// This is an ARM branch relocation, need to use a stub function.
DEBUG(dbgs() << "\t\tThis is an ARM branch relocation.");
SectionEntry &Section = Sections[Rel.SectionID];
uint8_t *Target = Section.Address + Rel.Offset;
// Assign an address to a symbol name and resolve all the relocations
// associated with it.
void RuntimeDyldELF::reassignSectionAddress(unsigned SectionID, uint64_t Addr) {
// The address to use for relocation resolution is not
// the address of the local section buffer. We must be doing
// a remote execution environment of some sort. Re-apply any
// relocations referencing this section with the given address.
//
// Addr is a uint64_t because we can't assume the pointer width
// of the target is the same as that of the host. Just use a generic
// "big enough" type.
assert(0);
// Look up for existing stub.
StubMap::const_iterator i = Stubs.find(Value);
if (i != Stubs.end()) {
resolveRelocation(Target, Section.LoadAddress, (uint64_t)Section.Address +
i->second, RelType, 0);
DEBUG(dbgs() << " Stub function found\n");
} else {
// Create a new stub function.
DEBUG(dbgs() << " Create a new stub function\n");
Stubs[Value] = Section.StubOffset;
uint8_t *StubTargetAddr = createStubFunction(Section.Address +
Section.StubOffset);
AddRelocation(Value, Rel.SectionID,
StubTargetAddr - Section.Address, ELF::R_ARM_ABS32);
resolveRelocation(Target, Section.LoadAddress, (uint64_t)Section.Address +
Section.StubOffset, RelType, 0);
Section.StubOffset += getMaxStubSize();
}
} else
AddRelocation(Value, Rel.SectionID, Rel.Offset, RelType);
}
bool RuntimeDyldELF::isCompatibleFormat(const MemoryBuffer *InputBuffer) const {

168
lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.h
View File

@@ -21,158 +21,42 @@ using namespace llvm;
namespace llvm {
class RuntimeDyldELF : public RuntimeDyldImpl {
// For each symbol, keep a list of relocations based on it. Anytime
// its address is reassigned (the JIT re-compiled the function, e.g.),
// the relocations get re-resolved.
struct RelocationEntry {
// Function or section this relocation is contained in.
std::string Target;
// Offset into the target function or section for the relocation.
uint32_t Offset;
// Relocation type
uint32_t Type;
// Addend encoded in the instruction itself, if any.
int32_t Addend;
// Has the relocation been recalcuated as an offset within a function?
bool IsFunctionRelative;
// Has this relocation been resolved previously?
bool isResolved;
protected:
void resolveX86_64Relocation(uint8_t *LocalAddress,
uint64_t FinalAddress,
uint64_t Value,
uint32_t Type,
int64_t Addend);
RelocationEntry(StringRef t,
uint32_t offset,
uint32_t type,
int32_t addend,
bool isFunctionRelative)
: Target(t)
, Offset(offset)
, Type(type)
, Addend(addend)
, IsFunctionRelative(isFunctionRelative)
, isResolved(false) { }
};
typedef SmallVector<RelocationEntry, 4> RelocationList;
StringMap<RelocationList> Relocations;
unsigned Arch;
void resolveX86Relocation(uint8_t *LocalAddress,
uint32_t FinalAddress,
uint32_t Value,
uint32_t Type,
int32_t Addend);
void resolveRelocations();
void resolveARMRelocation(uint8_t *LocalAddress,
uint32_t FinalAddress,
uint32_t Value,
uint32_t Type,
int32_t Addend);
void resolveX86_64Relocation(StringRef Name,
uint8_t *Addr,
const RelocationEntry &RE);
virtual void resolveRelocation(uint8_t *LocalAddress,
uint64_t FinalAddress,
uint64_t Value,
uint32_t Type,
int64_t Addend);
void resolveX86Relocation(StringRef Name,
uint8_t *Addr,
const RelocationEntry &RE);
void resolveArmRelocation(StringRef Name,
uint8_t *Addr,
const RelocationEntry &RE);
void resolveRelocation(StringRef Name,
uint8_t *Addr,
const RelocationEntry &RE);
virtual void processRelocationRef(const ObjRelocationInfo &Rel,
const ObjectFile &Obj,
ObjSectionToIDMap &ObjSectionToID,
LocalSymbolMap &Symbols, StubMap &Stubs);
public:
RuntimeDyldELF(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm) {}
bool loadObject(MemoryBuffer *InputBuffer);
void reassignSymbolAddress(StringRef Name, uint8_t *Addr);
void reassignSectionAddress(unsigned SectionID, uint64_t Addr);
bool isCompatibleFormat(const MemoryBuffer *InputBuffer) const;
};
} // end namespace llvm
#endif
//===-- RuntimeDyldELF.h - Run-time dynamic linker for MC-JIT ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// ELF support for MC-JIT runtime dynamic linker.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_RUNTIME_DYLD_ELF_H
#define LLVM_RUNTIME_DYLD_ELF_H
#include "RuntimeDyldImpl.h"
using namespace llvm;
namespace llvm {
class RuntimeDyldELF : public RuntimeDyldImpl {
// For each symbol, keep a list of relocations based on it. Anytime
// its address is reassigned (the JIT re-compiled the function, e.g.),
// the relocations get re-resolved.
struct RelocationEntry {
// Function or section this relocation is contained in.
std::string Target;
// Offset into the target function or section for the relocation.
uint32_t Offset;
// Relocation type
uint32_t Type;
// Addend encoded in the instruction itself, if any.
int32_t Addend;
// Has the relocation been recalcuated as an offset within a function?
bool IsFunctionRelative;
// Has this relocation been resolved previously?
bool isResolved;
RelocationEntry(StringRef t,
uint32_t offset,
uint32_t type,
int32_t addend,
bool isFunctionRelative)
: Target(t)
, Offset(offset)
, Type(type)
, Addend(addend)
, IsFunctionRelative(isFunctionRelative)
, isResolved(false) { }
};
typedef SmallVector<RelocationEntry, 4> RelocationList;
StringMap<RelocationList> Relocations;
unsigned Arch;
void resolveRelocations();
void resolveX86_64Relocation(StringRef Name,
uint8_t *Addr,
const RelocationEntry &RE);
void resolveX86Relocation(StringRef Name,
uint8_t *Addr,
const RelocationEntry &RE);
void resolveArmRelocation(StringRef Name,
uint8_t *Addr,
const RelocationEntry &RE);
void resolveRelocation(StringRef Name,
uint8_t *Addr,
const RelocationEntry &RE);
public:
RuntimeDyldELF(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm) {}
bool loadObject(MemoryBuffer *InputBuffer);
void reassignSymbolAddress(StringRef Name, uint8_t *Addr);
void reassignSectionAddress(unsigned SectionID, uint64_t Addr);
bool isCompatibleFormat(const MemoryBuffer *InputBuffer) const;
};
} // end namespace llvm
#endif
#endif

168
lib/ExecutionEngine/RuntimeDyld/RuntimeDyldImpl.h
View File

@@ -15,45 +15,125 @@
#define LLVM_RUNTIME_DYLD_IMPL_H
#include "llvm/ExecutionEngine/RuntimeDyld.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/Twine.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ExecutionEngine/ExecutionEngine.h"
#include "llvm/Support/Memory.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/system_error.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/ADT/Triple.h"
#include <map>
#include "llvm/Support/Format.h"
using namespace llvm;
using namespace llvm::object;
namespace llvm {
class SectionEntry {
public:
uint8_t* Address;
size_t Size;
uint64_t LoadAddress; // For each section, the address it will be
// considered to live at for relocations. The same
// as the pointer to the above memory block for
// hosted JITs.
uintptr_t StubOffset; // It's used for architecturies with stub
// functions for far relocations like ARM.
uintptr_t ObjAddress; // Section address in object file. It's use for
// calculate MachO relocation addend
SectionEntry(uint8_t* address, size_t size, uintptr_t stubOffset,
uintptr_t objAddress)
: Address(address), Size(size), LoadAddress((uintptr_t)address),
StubOffset(stubOffset), ObjAddress(objAddress) {}
};
class RelocationEntry {
public:
unsigned SectionID; // Section the relocation is contained in.
uintptr_t Offset; // Offset into the section for the relocation.
uint32_t Data; // Relocatino data. Including type of relocation
// and another flags and parameners from
intptr_t Addend; // Addend encoded in the instruction itself, if any,
// plus the offset into the source section for
// the symbol once the relocation is resolvable.
RelocationEntry(unsigned id, uint64_t offset, uint32_t data, int64_t addend)
: SectionID(id), Offset(offset), Data(data), Addend(addend) {}
};
// Raw relocation data from object file
class ObjRelocationInfo {
public:
unsigned SectionID;
uint64_t Offset;
SymbolRef Symbol;
uint64_t Type;
int64_t AdditionalInfo;
};
class RelocationValueRef {
public:
unsigned SectionID;
intptr_t Addend;
const char *SymbolName;
RelocationValueRef(): SectionID(0), Addend(0), SymbolName(0) {}
inline bool operator==(const RelocationValueRef &Other) const {
return std::memcmp(this, &Other, sizeof(RelocationValueRef)) == 0;
}
inline bool operator <(const RelocationValueRef &Other) const {
return std::memcmp(this, &Other, sizeof(RelocationValueRef)) < 0;
}
};
class RuntimeDyldImpl {
protected:
unsigned CPUType;
unsigned CPUSubtype;
// The MemoryManager to load objects into.
RTDyldMemoryManager *MemMgr;
// For each section, we have a MemoryBlock of it's data.
// Indexed by SectionID.
SmallVector<sys::MemoryBlock, 32> Sections;
// For each section, the address it will be considered to live at for
// relocations. The same as the pointer to the above memory block for hosted
// JITs. Indexed by SectionID.
SmallVector<uint64_t, 32> SectionLoadAddress;
// A list of emmitted sections.
typedef SmallVector<SectionEntry, 64> SectionList;
SectionList Sections;
// Keep a map of starting local address to the SectionID which references it.
// Lookup function for when we assign virtual addresses.
DenseMap<void *, unsigned> SectionLocalMemToID;
// Keep a map of sections from object file to the SectionID which
// references it.
typedef std::map<SectionRef, unsigned> ObjSectionToIDMap;
// Master symbol table. As modules are loaded and external symbols are
// resolved, their addresses are stored here as a SectionID/Offset pair.
typedef std::pair<unsigned, uint64_t> SymbolLoc;
typedef std::pair<unsigned, uintptr_t> SymbolLoc;
StringMap<SymbolLoc> SymbolTable;
typedef DenseMap<const char*, SymbolLoc> LocalSymbolMap;
// For each symbol, keep a list of relocations based on it. Anytime
// its address is reassigned (the JIT re-compiled the function, e.g.),
// the relocations get re-resolved.
// The symbol (or section) the relocation is sourced from is the Key
// in the relocation list where it's stored.
typedef SmallVector<RelocationEntry, 64> RelocationList;
// Relocations to sections already loaded. Indexed by SectionID which is the
// source of the address. The target where the address will be writen is
// SectionID/Offset in the relocation itself.
DenseMap<unsigned, RelocationList> Relocations;
// Relocations to external symbols that are not yet resolved.
// Indexed by symbol name.
StringMap<RelocationList> SymbolRelocations;
typedef std::map<RelocationValueRef, uintptr_t> StubMap;
Triple::ArchType Arch;
inline unsigned getMaxStubSize() {
if (Arch == Triple::arm || Arch == Triple::thumb)
return 8; // 32-bit instruction and 32-bit address
else
return 0;
}
bool HasError;
std::string ErrorStr;
@@ -66,17 +146,62 @@ protected:
}
uint8_t *getSectionAddress(unsigned SectionID) {
return (uint8_t*)Sections[SectionID].base();
return (uint8_t*)Sections[SectionID].Address;
}
void extractFunction(StringRef Name, uint8_t *StartAddress,
uint8_t *EndAddress);
/// \brief Emits section data from the object file to the MemoryManager.
/// \param IsCode if it's true then allocateCodeSection() will be
/// used for emmits, else allocateDataSection() will be used.
/// \return SectionID.
unsigned emitSection(const SectionRef &Section, bool IsCode);
/// \brief Find Section in LocalSections. If the secton is not found - emit
/// it and store in LocalSections.
/// \param IsCode if it's true then allocateCodeSection() will be
/// used for emmits, else allocateDataSection() will be used.
/// \return SectionID.
unsigned findOrEmitSection(const SectionRef &Section, bool IsCode,
ObjSectionToIDMap &LocalSections);
/// \brief If Value.SymbolName is NULL then store relocation to the
/// Relocations, else store it in the SymbolRelocations.
void AddRelocation(const RelocationValueRef &Value, unsigned SectionID,
uintptr_t Offset, uint32_t RelType);
/// \brief Emits long jump instruction to Addr.
/// \return Pointer to the memory area for emitting target address.
uint8_t* createStubFunction(uint8_t *Addr);
/// \brief Resolves relocations from Relocs list with address from Value.
void resolveRelocationList(const RelocationList &Relocs, uint64_t Value);
void resolveRelocationEntry(const RelocationEntry &RE, uint64_t Value);
/// \brief A object file specific relocation resolver
/// \param Address Address to apply the relocation action
/// \param Value Target symbol address to apply the relocation action
/// \param Type object file specific relocation type
/// \param Addend A constant addend used to compute the value to be stored
/// into the relocatable field
virtual void resolveRelocation(uint8_t *LocalAddress,
uint64_t FinalAddress,
uint64_t Value,
uint32_t Type,
int64_t Addend) = 0;
/// \brief Parses the object file relocation and store it to Relocations
/// or SymbolRelocations. Its depend from object file type.
virtual void processRelocationRef(const ObjRelocationInfo &Rel,
const ObjectFile &Obj,
ObjSectionToIDMap &ObjSectionToID,
LocalSymbolMap &Symbols, StubMap &Stubs) = 0;
void resolveSymbols();
public:
RuntimeDyldImpl(RTDyldMemoryManager *mm) : MemMgr(mm), HasError(false) {}
virtual ~RuntimeDyldImpl();
virtual bool loadObject(MemoryBuffer *InputBuffer) = 0;
bool loadObject(const MemoryBuffer *InputBuffer);
void *getSymbolAddress(StringRef Name) {
// FIXME: Just look up as a function for now. Overly simple of course.
@@ -87,9 +212,9 @@ public:
return getSectionAddress(Loc.first) + Loc.second;
}
virtual void resolveRelocations();
void resolveRelocations();
virtual void reassignSectionAddress(unsigned SectionID, uint64_t Addr) = 0;
void reassignSectionAddress(unsigned SectionID, uint64_t Addr);
void mapSectionAddress(void *LocalAddress, uint64_t TargetAddress);
@@ -103,6 +228,7 @@ public:
StringRef getErrorString() { return ErrorStr; }
virtual bool isCompatibleFormat(const MemoryBuffer *InputBuffer) const = 0;
};
} // end namespace llvm

623
lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp
View File

@@ -21,41 +21,55 @@ using namespace llvm::object;
namespace llvm {
bool RuntimeDyldMachO::
resolveRelocation(uint8_t *LocalAddress,
uint64_t FinalAddress,
uint64_t Value,
bool isPCRel,
unsigned Type,
unsigned Size,
int64_t Addend) {
void RuntimeDyldMachO::resolveRelocation(uint8_t *LocalAddress,
uint64_t FinalAddress,
uint64_t Value,
uint32_t Type,
int64_t Addend) {
bool isPCRel = (Type >> 24) & 1;
unsigned MachoType = (Type >> 28) & 0xf;
unsigned Size = 1 << ((Type >> 25) & 3);
DEBUG(dbgs() << "resolveRelocation LocalAddress: " << format("%p", LocalAddress)
<< " FinalAddress: " << format("%p", FinalAddress)
<< " Value: " << format("%p", Value)
<< " Addend: " << Addend
<< " isPCRel: " << isPCRel
<< " MachoType: " << MachoType
<< " Size: " << Size
<< "\n");
// This just dispatches to the proper target specific routine.
switch (CPUType) {
switch (Arch) {
default: llvm_unreachable("Unsupported CPU type!");
case mach::CTM_i386:
return resolveI386Relocation(LocalAddress,
case Triple::x86_64:
resolveX86_64Relocation(LocalAddress,
FinalAddress,
(uintptr_t)Value,
isPCRel,
MachoType,
Size,
Addend);
break;
case Triple::x86:
resolveI386Relocation(LocalAddress,
FinalAddress,
(uintptr_t)Value,
isPCRel,
Type,
Size,
Addend);
case mach::CTM_x86_64:
return resolveX86_64Relocation(LocalAddress,
FinalAddress,
(uintptr_t)Value,
isPCRel,
Type,
Size,
Addend);
case mach::CTM_ARM:
return resolveARMRelocation(LocalAddress,
FinalAddress,
(uintptr_t)Value,
isPCRel,
Type,
Size,
Addend);
break;
case Triple::arm: // Fall through.
case Triple::thumb:
resolveARMRelocation(LocalAddress,
FinalAddress,
(uintptr_t)Value,
isPCRel,
MachoType,
Size,
Addend);
break;
}
}
@@ -190,503 +204,84 @@ resolveARMRelocation(uint8_t *LocalAddress,
return false;
}
bool RuntimeDyldMachO::
loadSegment32(const MachOObject *Obj,
const MachOObject::LoadCommandInfo *SegmentLCI,
const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC) {
// FIXME: This should really be combined w/ loadSegment64. Templatized
// function on the 32/64 datatypes maybe?
InMemoryStruct<macho::SegmentLoadCommand> SegmentLC;
Obj->ReadSegmentLoadCommand(*SegmentLCI, SegmentLC);
if (!SegmentLC)
return Error("unable to load segment load command");
void RuntimeDyldMachO::processRelocationRef(const ObjRelocationInfo &Rel,
const ObjectFile &Obj,
ObjSectionToIDMap &ObjSectionToID,
LocalSymbolMap &Symbols,
StubMap &Stubs) {
uint32_t RelType = (uint32_t) (Rel.Type & 0xffffffffL);
RelocationValueRef Value;
SectionEntry &Section = Sections[Rel.SectionID];
uint8_t *Target = Section.Address + Rel.Offset;
SmallVector<unsigned, 16> SectionMap;
for (unsigned SectNum = 0; SectNum != SegmentLC->NumSections; ++SectNum) {
InMemoryStruct<macho::Section> Sect;
Obj->ReadSection(*SegmentLCI, SectNum, Sect);
if (!Sect)
return Error("unable to load section: '" + Twine(SectNum) + "'");
// Allocate memory via the MM for the section.
uint8_t *Buffer;
uint32_t SectionID = Sections.size();
if (Sect->Flags == 0x80000400)
Buffer = MemMgr->allocateCodeSection(Sect->Size, Sect->Align, SectionID);
else
Buffer = MemMgr->allocateDataSection(Sect->Size, Sect->Align, SectionID);
DEBUG(dbgs() << "Loading "
<< ((Sect->Flags == 0x80000400) ? "text" : "data")
<< " (ID #" << SectionID << ")"
<< " '" << Sect->SegmentName << ","
<< Sect->Name << "' of size " << Sect->Size
<< " to address " << Buffer << ".\n");
// Copy the payload from the object file into the allocated buffer.
uint8_t *Base = (uint8_t*)Obj->getData(SegmentLC->FileOffset,
SegmentLC->FileSize).data();
memcpy(Buffer, Base + Sect->Address, Sect->Size);
// Remember what got allocated for this SectionID.
Sections.push_back(sys::MemoryBlock(Buffer, Sect->Size));
SectionLocalMemToID[Buffer] = SectionID;
// By default, the load address of a section is its memory buffer.
SectionLoadAddress.push_back((uint64_t)Buffer);
// Keep a map of object file section numbers to corresponding SectionIDs
// while processing the file.
SectionMap.push_back(SectionID);
}
// Process the symbol table.
SmallVector<StringRef, 64> SymbolNames;
processSymbols32(Obj, SectionMap, SymbolNames, SymtabLC);
// Process the relocations for each section we're loading.
Relocations.grow(Relocations.size() + SegmentLC->NumSections);
Referrers.grow(Referrers.size() + SegmentLC->NumSections);
for (unsigned SectNum = 0; SectNum != SegmentLC->NumSections; ++SectNum) {
InMemoryStruct<macho::Section> Sect;
Obj->ReadSection(*SegmentLCI, SectNum, Sect);
if (!Sect)
return Error("unable to load section: '" + Twine(SectNum) + "'");
for (unsigned j = 0; j != Sect->NumRelocationTableEntries; ++j) {
InMemoryStruct<macho::RelocationEntry> RE;
Obj->ReadRelocationEntry(Sect->RelocationTableOffset, j, RE);
if (RE->Word0 & macho::RF_Scattered)
return Error("NOT YET IMPLEMENTED: scattered relocations.");
// Word0 of the relocation is the offset into the section where the
// relocation should be applied. We need to translate that into an
// offset into a function since that's our atom.
uint32_t Offset = RE->Word0;
bool isExtern = (RE->Word1 >> 27) & 1;
// FIXME: Get the relocation addend from the target address.
// FIXME: VERY imporant for internal relocations.
// Figure out the source symbol of the relocation. If isExtern is true,
// this relocation references the symbol table, otherwise it references
// a section in the same object, numbered from 1 through NumSections
// (SectionBases is [0, NumSections-1]).
uint32_t SourceNum = RE->Word1 & 0xffffff; // 24-bit value
if (!isExtern) {
assert(SourceNum > 0 && "Invalid relocation section number!");
unsigned SectionID = SectionMap[SourceNum - 1];
unsigned TargetID = SectionMap[SectNum];
DEBUG(dbgs() << "Internal relocation at Section #"
<< TargetID << " + " << Offset
<< " from Section #"
<< SectionID << " (Word1: "
<< format("0x%x", RE->Word1) << ")\n");
// Store the relocation information. It will get resolved when
// the section addresses are assigned.
uint32_t RelocationIndex = Relocations[SectionID].size();
Relocations[SectionID].push_back(RelocationEntry(TargetID,
Offset,
RE->Word1,
0 /*Addend*/));
Referrers[TargetID].push_back(Referrer(SectionID, RelocationIndex));
} else {
StringRef SourceName = SymbolNames[SourceNum];
// Now store the relocation information. Associate it with the source
// symbol. Just add it to the unresolved list and let the general
// path post-load resolve it if we know where the symbol is.
UnresolvedRelocations[SourceName].push_back(RelocationEntry(SectNum,
Offset,
RE->Word1,
0 /*Addend*/));
DEBUG(dbgs() << "Relocation at Section #" << SectNum << " + " << Offset
<< " from '" << SourceName << "(Word1: "
<< format("0x%x", RE->Word1) << ")\n");
}
bool isExtern = (RelType >> 27) & 1;
if (isExtern) {
StringRef TargetName;
const SymbolRef &Symbol = Rel.Symbol;
Symbol.getName(TargetName);
// First look the symbol in object file symbols.
LocalSymbolMap::iterator lsi = Symbols.find(TargetName.data());
if (lsi != Symbols.end()) {
Value.SectionID = lsi->second.first;
Value.Addend = lsi->second.second;
} else {
// Second look the symbol in global symbol table.
StringMap<SymbolLoc>::iterator gsi = SymbolTable.find(TargetName.data());
if (gsi != SymbolTable.end()) {
Value.SectionID = gsi->second.first;
Value.Addend = gsi->second.second;
} else
Value.SymbolName = TargetName.data();
}
}
// Resolve the addresses of any symbols that were defined in this segment.
for (int i = 0, e = SymbolNames.size(); i != e; ++i)
resolveSymbol(SymbolNames[i]);
return false;
}
bool RuntimeDyldMachO::
loadSegment64(const MachOObject *Obj,
const MachOObject::LoadCommandInfo *SegmentLCI,
const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC) {
InMemoryStruct<macho::Segment64LoadCommand> Segment64LC;
Obj->ReadSegment64LoadCommand(*SegmentLCI, Segment64LC);
if (!Segment64LC)
return Error("unable to load segment load command");
SmallVector<unsigned, 16> SectionMap;
for (unsigned SectNum = 0; SectNum != Segment64LC->NumSections; ++SectNum) {
InMemoryStruct<macho::Section64> Sect;
Obj->ReadSection64(*SegmentLCI, SectNum, Sect);
if (!Sect)
return Error("unable to load section: '" + Twine(SectNum) + "'");
// Allocate memory via the MM for the section.
uint8_t *Buffer;
uint32_t SectionID = Sections.size();
unsigned Align = 1 << Sect->Align; // .o file has log2 alignment.
if (Sect->Flags == 0x80000400)
Buffer = MemMgr->allocateCodeSection(Sect->Size, Align, SectionID);
else
Buffer = MemMgr->allocateDataSection(Sect->Size, Align, SectionID);
DEBUG(dbgs() << "Loading "
<< ((Sect->Flags == 0x80000400) ? "text" : "data")
<< " (ID #" << SectionID << ")"
<< " '" << Sect->SegmentName << ","
<< Sect->Name << "' of size " << Sect->Size
<< " (align " << Align << ")"
<< " to address " << Buffer << ".\n");
// Copy the payload from the object file into the allocated buffer.
uint8_t *Base = (uint8_t*)Obj->getData(Segment64LC->FileOffset,
Segment64LC->FileSize).data();
memcpy(Buffer, Base + Sect->Address, Sect->Size);
// Remember what got allocated for this SectionID.
Sections.push_back(sys::MemoryBlock(Buffer, Sect->Size));
SectionLocalMemToID[Buffer] = SectionID;
// By default, the load address of a section is its memory buffer.
SectionLoadAddress.push_back((uint64_t)Buffer);
// Keep a map of object file section numbers to corresponding SectionIDs
// while processing the file.
SectionMap.push_back(SectionID);
}
// Process the symbol table.
SmallVector<StringRef, 64> SymbolNames;
processSymbols64(Obj, SectionMap, SymbolNames, SymtabLC);
// Process the relocations for each section we're loading.
Relocations.grow(Relocations.size() + Segment64LC->NumSections);
Referrers.grow(Referrers.size() + Segment64LC->NumSections);
for (unsigned SectNum = 0; SectNum != Segment64LC->NumSections; ++SectNum) {
InMemoryStruct<macho::Section64> Sect;
Obj->ReadSection64(*SegmentLCI, SectNum, Sect);
if (!Sect)
return Error("unable to load section: '" + Twine(SectNum) + "'");
for (unsigned j = 0; j != Sect->NumRelocationTableEntries; ++j) {
InMemoryStruct<macho::RelocationEntry> RE;
Obj->ReadRelocationEntry(Sect->RelocationTableOffset, j, RE);
if (RE->Word0 & macho::RF_Scattered)
return Error("NOT YET IMPLEMENTED: scattered relocations.");
// Word0 of the relocation is the offset into the section where the
// relocation should be applied. We need to translate that into an
// offset into a function since that's our atom.
uint32_t Offset = RE->Word0;
bool isExtern = (RE->Word1 >> 27) & 1;
// FIXME: Get the relocation addend from the target address.
// FIXME: VERY imporant for internal relocations.
// Figure out the source symbol of the relocation. If isExtern is true,
// this relocation references the symbol table, otherwise it references
// a section in the same object, numbered from 1 through NumSections
// (SectionBases is [0, NumSections-1]).
uint32_t SourceNum = RE->Word1 & 0xffffff; // 24-bit value
if (!isExtern) {
assert(SourceNum > 0 && "Invalid relocation section number!");
unsigned SectionID = SectionMap[SourceNum - 1];
unsigned TargetID = SectionMap[SectNum];
DEBUG(dbgs() << "Internal relocation at Section #"
<< TargetID << " + " << Offset
<< " from Section #"
<< SectionID << " (Word1: "
<< format("0x%x", RE->Word1) << ")\n");
// Store the relocation information. It will get resolved when
// the section addresses are assigned.
uint32_t RelocationIndex = Relocations[SectionID].size();
Relocations[SectionID].push_back(RelocationEntry(TargetID,
Offset,
RE->Word1,
0 /*Addend*/));
Referrers[TargetID].push_back(Referrer(SectionID, RelocationIndex));
} else {
StringRef SourceName = SymbolNames[SourceNum];
// Now store the relocation information. Associate it with the source
// symbol. Just add it to the unresolved list and let the general
// path post-load resolve it if we know where the symbol is.
UnresolvedRelocations[SourceName].push_back(RelocationEntry(SectNum,
Offset,
RE->Word1,
0 /*Addend*/));
DEBUG(dbgs() << "Relocation at Section #" << SectNum << " + " << Offset
<< " from '" << SourceName << "(Word1: "
<< format("0x%x", RE->Word1) << ")\n");
}
}
}
// Resolve the addresses of any symbols that were defined in this segment.
for (int i = 0, e = SymbolNames.size(); i != e; ++i)
resolveSymbol(SymbolNames[i]);
return false;
}
bool RuntimeDyldMachO::
processSymbols32(const MachOObject *Obj,
SmallVectorImpl<unsigned> &SectionMap,
SmallVectorImpl<StringRef> &SymbolNames,
const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC) {
// FIXME: Combine w/ processSymbols64. Factor 64/32 datatype and such.
for (unsigned i = 0; i != SymtabLC->NumSymbolTableEntries; ++i) {
InMemoryStruct<macho::SymbolTableEntry> STE;
Obj->ReadSymbolTableEntry(SymtabLC->SymbolTableOffset, i, STE);
if (!STE)
return Error("unable to read symbol: '" + Twine(i) + "'");
// Get the symbol name.
StringRef Name = Obj->getStringAtIndex(STE->StringIndex);
SymbolNames.push_back(Name);
// FIXME: Check the symbol type and flags.
if (STE->Type != 0xF) // external, defined in this segment.
continue;
// Flags in the upper nibble we don't care about.
if ((STE->Flags & 0xf) != 0x0)
continue;
// Remember the symbol.
uint32_t SectionID = SectionMap[STE->SectionIndex - 1];
SymbolTable[Name] = SymbolLoc(SectionID, STE->Value);
DEBUG(dbgs() << "Symbol: '" << Name << "' @ "
<< (getSectionAddress(SectionID) + STE->Value)
<< "\n");
}
return false;
}
bool RuntimeDyldMachO::
processSymbols64(const MachOObject *Obj,
SmallVectorImpl<unsigned> &SectionMap,
SmallVectorImpl<StringRef> &SymbolNames,
const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC) {
for (unsigned i = 0; i != SymtabLC->NumSymbolTableEntries; ++i) {
InMemoryStruct<macho::Symbol64TableEntry> STE;
Obj->ReadSymbol64TableEntry(SymtabLC->SymbolTableOffset, i, STE);
if (!STE)
return Error("unable to read symbol: '" + Twine(i) + "'");
// Get the symbol name.
StringRef Name = Obj->getStringAtIndex(STE->StringIndex);
SymbolNames.push_back(Name);
// FIXME: Check the symbol type and flags.
if (STE->Type != 0xF) // external, defined in this segment.
continue;
// Flags in the upper nibble we don't care about.
if ((STE->Flags & 0xf) != 0x0)
continue;
// Remember the symbol.
uint32_t SectionID = SectionMap[STE->SectionIndex - 1];
SymbolTable[Name] = SymbolLoc(SectionID, STE->Value);
DEBUG(dbgs() << "Symbol: '" << Name << "' @ "
<< (getSectionAddress(SectionID) + STE->Value)
<< "\n");
}
return false;
}
// resolveSymbol - Resolve any relocations to the specified symbol if
// we know where it lives.
void RuntimeDyldMachO::resolveSymbol(StringRef Name) {
StringMap<SymbolLoc>::const_iterator Loc = SymbolTable.find(Name);
if (Loc == SymbolTable.end())
return;
RelocationList &Relocs = UnresolvedRelocations[Name];
DEBUG(dbgs() << "Resolving symbol '" << Name << "'\n");
for (int i = 0, e = Relocs.size(); i != e; ++i) {
// Change the relocation to be section relative rather than symbol
// relative and move it to the resolved relocation list.
RelocationEntry Entry = Relocs[i];
Entry.Addend += Loc->second.second;
uint32_t RelocationIndex = Relocations[Loc->second.first].size();
Relocations[Loc->second.first].push_back(Entry);
Referrers[Entry.SectionID].push_back(Referrer(Loc->second.first, RelocationIndex));
}
// FIXME: Keep a worklist of the relocations we've added so that we can
// resolve more selectively later.
Relocs.clear();
}
bool RuntimeDyldMachO::loadObject(MemoryBuffer *InputBuffer) {
// If the linker is in an error state, don't do anything.
if (hasError())
return true;
// Load the Mach-O wrapper object.
std::string ErrorStr;
OwningPtr<MachOObject> Obj(
MachOObject::LoadFromBuffer(InputBuffer, &ErrorStr));
if (!Obj)
return Error("unable to load object: '" + ErrorStr + "'");
// Get the CPU type information from the header.
const macho::Header &Header = Obj->getHeader();
// FIXME: Error checking that the loaded object is compatible with
// the system we're running on.
CPUType = Header.CPUType;
CPUSubtype = Header.CPUSubtype;
// Validate that the load commands match what we expect.
const MachOObject::LoadCommandInfo *SegmentLCI = 0, *SymtabLCI = 0,
*DysymtabLCI = 0;
for (unsigned i = 0; i != Header.NumLoadCommands; ++i) {
const MachOObject::LoadCommandInfo &LCI = Obj->getLoadCommandInfo(i);
switch (LCI.Command.Type) {
case macho::LCT_Segment:
case macho::LCT_Segment64:
if (SegmentLCI)
return Error("unexpected input object (multiple segments)");
SegmentLCI = &LCI;
break;
case macho::LCT_Symtab:
if (SymtabLCI)
return Error("unexpected input object (multiple symbol tables)");
SymtabLCI = &LCI;
break;
case macho::LCT_Dysymtab:
if (DysymtabLCI)
return Error("unexpected input object (multiple symbol tables)");
DysymtabLCI = &LCI;
break;
default:
return Error("unexpected input object (unexpected load command");
}
}
if (!SymtabLCI)
return Error("no symbol table found in object");
if (!SegmentLCI)
return Error("no segments found in object");
// Read and register the symbol table data.
InMemoryStruct<macho::SymtabLoadCommand> SymtabLC;
Obj->ReadSymtabLoadCommand(*SymtabLCI, SymtabLC);
if (!SymtabLC)
return Error("unable to load symbol table load command");
Obj->RegisterStringTable(*SymtabLC);
// Read the dynamic link-edit information, if present (not present in static
// objects).
if (DysymtabLCI) {
InMemoryStruct<macho::DysymtabLoadCommand> DysymtabLC;
Obj->ReadDysymtabLoadCommand(*DysymtabLCI, DysymtabLC);
if (!DysymtabLC)
return Error("unable to load dynamic link-exit load command");
// FIXME: We don't support anything interesting yet.
// if (DysymtabLC->LocalSymbolsIndex != 0)
// return Error("NOT YET IMPLEMENTED: local symbol entries");
// if (DysymtabLC->ExternalSymbolsIndex != 0)
// return Error("NOT YET IMPLEMENTED: non-external symbol entries");
// if (DysymtabLC->UndefinedSymbolsIndex != SymtabLC->NumSymbolTableEntries)
// return Error("NOT YET IMPLEMENTED: undefined symbol entries");
}
// Load the segment load command.
if (SegmentLCI->Command.Type == macho::LCT_Segment) {
if (loadSegment32(Obj.get(), SegmentLCI, SymtabLC))
return true;
} else {
if (loadSegment64(Obj.get(), SegmentLCI, SymtabLC))
return true;
error_code err;
uint8_t sectionIndex = static_cast<uint8_t>(RelType & 0xFF);
section_iterator si = Obj.begin_sections(),
se = Obj.end_sections();
for (uint8_t i = 1; i < sectionIndex; i++) {
error_code err;
si.increment(err);
if (si == se)
break;
}
assert(si != se && "No section containing relocation!");
Value.SectionID = findOrEmitSection(*si, true, ObjSectionToID);
Value.Addend = *(const intptr_t *)Target;
if (Value.Addend) {
// The MachO addend is offset from the current section, we need set it
// as offset from destination section
Value.Addend += Section.ObjAddress - Sections[Value.SectionID].ObjAddress;
}
}
// Assign the addresses of the sections from the object so that any
// relocations to them get set properly.
// FIXME: This is done directly from the client at the moment. We should
// default the values to the local storage, at least when the target arch
// is the same as the host arch.
if (Arch == Triple::arm && RelType == macho::RIT_ARM_Branch24Bit) {
// This is an ARM branch relocation, need to use a stub function.
return false;
// Look up for existing stub.
StubMap::const_iterator i = Stubs.find(Value);
if (i != Stubs.end())
resolveRelocation(Target, (uint64_t)Target,
(uint64_t)Section.Address + i->second,
RelType, 0);
else {
// Create a new stub function.
Stubs[Value] = Section.StubOffset;
uint8_t *StubTargetAddr = createStubFunction(Section.Address +
Section.StubOffset);
AddRelocation(Value, Rel.SectionID, StubTargetAddr - Section.Address,
macho::RIT_Vanilla);
resolveRelocation(Target, (uint64_t)Target,
(uint64_t)Section.Address + Section.StubOffset,
RelType, 0);
Section.StubOffset += getMaxStubSize();
}
} else
AddRelocation(Value, Rel.SectionID, Rel.Offset, RelType);
}
// Assign an address to a symbol name and resolve all the relocations
// associated with it.
void RuntimeDyldMachO::reassignSectionAddress(unsigned SectionID,
uint64_t Addr) {
// The address to use for relocation resolution is not
// the address of the local section buffer. We must be doing
// a remote execution environment of some sort. Re-apply any
// relocations referencing this section with the given address.
//
// Addr is a uint64_t because we can't assume the pointer width
// of the target is the same as that of the host. Just use a generic
// "big enough" type.
SectionLoadAddress[SectionID] = Addr;
RelocationList &Relocs = Relocations[SectionID];
for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
RelocationEntry &RE = Relocs[i];
uint8_t *Target = (uint8_t*)Sections[RE.SectionID].base() + RE.Offset;
uint64_t FinalTarget = (uint64_t)SectionLoadAddress[RE.SectionID] + RE.Offset;
bool isPCRel = (RE.Data >> 24) & 1;
unsigned Type = (RE.Data >> 28) & 0xf;
unsigned Size = 1 << ((RE.Data >> 25) & 3);
DEBUG(dbgs() << "Resolving relocation at Section #" << RE.SectionID
<< " + " << RE.Offset << " (" << format("%p", Target) << ")"
<< " from Section #" << SectionID << " (" << format("%p", Addr) << ")"
<< "(" << (isPCRel ? "pcrel" : "absolute")
<< ", type: " << Type << ", Size: " << Size << ", Addend: "
<< RE.Addend << ").\n");
resolveRelocation(Target,
FinalTarget,
Addr,
isPCRel,
Type,
Size,
RE.Addend);
}
ReferrerList &Refers = Referrers[SectionID];
for (unsigned i = 0, e = Refers.size(); i != e; ++i) {
Referrer &R = Refers[i];
RelocationEntry &RE = Relocations[R.SectionID][R.Index];
uint8_t *Target = (uint8_t*)Sections[RE.SectionID].base() + RE.Offset;
uint64_t FinalTarget = (uint64_t)SectionLoadAddress[RE.SectionID] + RE.Offset;
bool isPCRel = (RE.Data >> 24) & 1;
unsigned Type = (RE.Data >> 28) & 0xf;
unsigned Size = 1 << ((RE.Data >> 25) & 3);
DEBUG(dbgs() << "Resolving relocation at Section #" << RE.SectionID
<< " + " << RE.Offset << " (" << format("%p", Target) << ")"
<< " from Section #" << SectionID << " (" << format("%p", Addr) << ")"
<< "(" << (isPCRel ? "pcrel" : "absolute")
<< ", type: " << Type << ", Size: " << Size << ", Addend: "
<< RE.Addend << ").\n");
resolveRelocation(Target,
FinalTarget,
Addr,
isPCRel,
Type,
Size,
RE.Addend);
}
}
bool RuntimeDyldMachO::isKnownFormat(const MemoryBuffer *InputBuffer) {
bool RuntimeDyldMachO::isCompatibleFormat(const MemoryBuffer *InputBuffer) const {
StringRef Magic = InputBuffer->getBuffer().slice(0, 4);
if (Magic == "\xFE\xED\xFA\xCE") return true;
if (Magic == "\xCE\xFA\xED\xFE") return true;

86
lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.h
View File

@@ -25,55 +25,7 @@ using namespace llvm::object;
namespace llvm {
class RuntimeDyldMachO : public RuntimeDyldImpl {
// For each symbol, keep a list of relocations based on it. Anytime
// its address is reassigned (the JIT re-compiled the function, e.g.),
// the relocations get re-resolved.
// The symbol (or section) the relocation is sourced from is the Key
// in the relocation list where it's stored.
struct RelocationEntry {
unsigned SectionID; // Section the relocation is contained in.
uint64_t Offset; // Offset into the section for the relocation.
uint32_t Data; // Second word of the raw macho relocation entry.
int64_t Addend; // Addend encoded in the instruction itself, if any,
// plus the offset into the source section for
// the symbol once the relocation is resolvable.
RelocationEntry(unsigned id, uint64_t offset, uint32_t data, int64_t addend)
: SectionID(id), Offset(offset), Data(data), Addend(addend) {}
};
typedef SmallVector<RelocationEntry, 4> RelocationList;
// For each section, keep a list of referrers in that section that are clients
// of relocations in other sections. Whenever a relocation gets created,
// create a corresponding referrer. Whenever relocations are re-resolved,
// re-resolve the referrers' relocations as well.
struct Referrer {
unsigned SectionID; // Section whose RelocationList contains the relocation.
uint32_t Index; // Index of the RelocatonEntry in that RelocationList.
Referrer(unsigned id, uint32_t index)
: SectionID(id), Index(index) {}
};
typedef SmallVector<Referrer, 4> ReferrerList;
// Relocations to sections already loaded. Indexed by SectionID which is the
// source of the address. The target where the address will be writen is
// SectionID/Offset in the relocation itself.
IndexedMap<RelocationList> Relocations;
// Referrers corresponding to Relocations.
IndexedMap<ReferrerList> Referrers;
// Relocations to symbols that are not yet resolved. Must be external
// relocations by definition. Indexed by symbol name.
StringMap<RelocationList> UnresolvedRelocations;
bool resolveRelocation(uint8_t *LocalAddress,
uint64_t FinalAddress,
uint64_t Value,
bool isPCRel,
unsigned Type,
unsigned Size,
int64_t Addend);
protected:
bool resolveI386Relocation(uint8_t *LocalAddress,
uint64_t FinalAddress,
uint64_t Value,
@@ -96,35 +48,21 @@ class RuntimeDyldMachO : public RuntimeDyldImpl {
unsigned Size,
int64_t Addend);
bool loadSegment32(const MachOObject *Obj,
const MachOObject::LoadCommandInfo *SegmentLCI,
const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC);
bool loadSegment64(const MachOObject *Obj,
const MachOObject::LoadCommandInfo *SegmentLCI,
const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC);
bool processSymbols32(const MachOObject *Obj,
SmallVectorImpl<unsigned> &SectionMap,
SmallVectorImpl<StringRef> &SymbolNames,
const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC);
bool processSymbols64(const MachOObject *Obj,
SmallVectorImpl<unsigned> &SectionMap,
SmallVectorImpl<StringRef> &SymbolNames,
const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC);
void resolveSymbol(StringRef Name);
virtual void processRelocationRef(const ObjRelocationInfo &Rel,
const ObjectFile &Obj,
ObjSectionToIDMap &ObjSectionToID,
LocalSymbolMap &Symbols, StubMap &Stubs);
public:
virtual void resolveRelocation(uint8_t *LocalAddress,
uint64_t FinalAddress,
uint64_t Value,
uint32_t Type,
int64_t Addend);
RuntimeDyldMachO(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm) {}
bool loadObject(MemoryBuffer *InputBuffer);
void reassignSectionAddress(unsigned SectionID, uint64_t Addr);
static bool isKnownFormat(const MemoryBuffer *InputBuffer);
bool isCompatibleFormat(const MemoryBuffer *InputBuffer) const {
return isKnownFormat(InputBuffer);
}
bool isCompatibleFormat(const MemoryBuffer *InputBuffer) const;
};
} // end namespace llvm