diff options
Diffstat (limited to 'lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp')
| -rw-r--r-- | lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp | 295 |
1 files changed, 25 insertions, 270 deletions
diff --git a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp index 7a2b858611..2896c2d556 100644 --- a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp +++ b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp @@ -26,290 +26,45 @@ RuntimeDyldImpl::~RuntimeDyldImpl() {} namespace llvm { -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 +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)); + // 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, Sections[i].LoadAddress); + reassignSectionAddress(i, SectionLoadAddress[i]); } } void RuntimeDyldImpl::mapSectionAddress(void *LocalAddress, uint64_t 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; + assert(SectionLocalMemToID.count(LocalAddress) && + "Attempting to remap address of unknown section!"); + unsigned SectionID = SectionLocalMemToID[LocalAddress]; + reassignSectionAddress(SectionID, TargetAddress); } -// 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) { |