mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-08-05 13:26:55 +00:00
Re-factored RuntimeDyld.
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
@@ -26,45 +26,290 @@ RuntimeDyldImpl::~RuntimeDyldImpl() {}
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namespace llvm {
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void RuntimeDyldImpl::extractFunction(StringRef Name, uint8_t *StartAddress,
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uint8_t *EndAddress) {
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// FIXME: DEPRECATED in favor of by-section allocation.
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// Allocate memory for the function via the memory manager.
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uintptr_t Size = EndAddress - StartAddress + 1;
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uintptr_t AllocSize = Size;
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uint8_t *Mem = MemMgr->startFunctionBody(Name.data(), AllocSize);
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assert(Size >= (uint64_t)(EndAddress - StartAddress + 1) &&
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"Memory manager failed to allocate enough memory!");
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// Copy the function payload into the memory block.
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memcpy(Mem, StartAddress, Size);
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MemMgr->endFunctionBody(Name.data(), Mem, Mem + Size);
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// Remember where we put it.
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unsigned SectionID = Sections.size();
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Sections.push_back(sys::MemoryBlock(Mem, Size));
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namespace {
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// Helper for extensive error checking in debug builds.
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error_code Check(error_code Err) {
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if (Err) {
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report_fatal_error(Err.message());
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}
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return Err;
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}
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} // end anonymous namespace
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// Default the assigned address for this symbol to wherever this
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// allocated it.
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SymbolTable[Name] = SymbolLoc(SectionID, 0);
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DEBUG(dbgs() << " allocated to [" << Mem << ", " << Mem + Size << "]\n");
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}
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// Resolve the relocations for all symbols we currently know about.
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void RuntimeDyldImpl::resolveRelocations() {
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// First, resolve relocations assotiated with external symbols.
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resolveSymbols();
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// Just iterate over the sections we have and resolve all the relocations
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// in them. Gross overkill, but it gets the job done.
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for (int i = 0, e = Sections.size(); i != e; ++i) {
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reassignSectionAddress(i, SectionLoadAddress[i]);
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reassignSectionAddress(i, Sections[i].LoadAddress);
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}
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}
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void RuntimeDyldImpl::mapSectionAddress(void *LocalAddress,
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uint64_t TargetAddress) {
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assert(SectionLocalMemToID.count(LocalAddress) &&
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"Attempting to remap address of unknown section!");
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unsigned SectionID = SectionLocalMemToID[LocalAddress];
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reassignSectionAddress(SectionID, TargetAddress);
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for (unsigned i = 0, e = Sections.size(); i != e; ++i) {
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if (Sections[i].Address == LocalAddress) {
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reassignSectionAddress(i, TargetAddress);
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return;
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}
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}
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llvm_unreachable("Attempting to remap address of unknown section!");
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}
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bool RuntimeDyldImpl::loadObject(const MemoryBuffer *InputBuffer) {
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// FIXME: ObjectFile don't modify MemoryBuffer.
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// It should use const MemoryBuffer as parameter.
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ObjectFile *obj
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= ObjectFile::createObjectFile(const_cast<MemoryBuffer*>(InputBuffer));
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Arch = (Triple::ArchType)obj->getArch();
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LocalSymbolMap LocalSymbols; // Functions and data symbols from the
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// object file.
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ObjSectionToIDMap LocalSections; // Used sections from the object file
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error_code err;
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// Parse symbols
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DEBUG(dbgs() << "Parse symbols:\n");
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for (symbol_iterator i = obj->begin_symbols(), e = obj->end_symbols();
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i != e; i.increment(err)) {
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Check(err);
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object::SymbolRef::Type SymType;
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StringRef Name;
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Check(i->getType(SymType));
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Check(i->getName(Name));
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if (SymType == object::SymbolRef::ST_Function ||
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SymType == object::SymbolRef::ST_Data) {
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uint64_t FileOffset;
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uint32_t flags;
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StringRef sData;
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section_iterator si = obj->end_sections();
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Check(i->getFileOffset(FileOffset));
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Check(i->getFlags(flags));
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Check(i->getSection(si));
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if (si == obj->end_sections()) continue;
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Check(si->getContents(sData));
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const uint8_t* SymPtr = (const uint8_t*)InputBuffer->getBufferStart() +
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(uintptr_t)FileOffset;
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uintptr_t SectOffset = (uintptr_t)(SymPtr - (const uint8_t*)sData.begin());
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unsigned SectionID
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= findOrEmitSection(*si,
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SymType == object::SymbolRef::ST_Function,
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LocalSections);
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bool isGlobal = flags & SymbolRef::SF_Global;
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LocalSymbols[Name.data()] = SymbolLoc(SectionID, SectOffset);
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DEBUG(dbgs() << "\tFileOffset: " << format("%p", (uintptr_t)FileOffset)
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<< " flags: " << flags
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<< " SID: " << SectionID
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<< " Offset: " << format("%p", SectOffset));
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if (isGlobal)
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SymbolTable[Name] = SymbolLoc(SectionID, SectOffset);
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}
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DEBUG(dbgs() << "\tType: " << SymType << " Name: " << Name << "\n");
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}
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// Parse and proccess relocations
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DEBUG(dbgs() << "Parse relocations:\n");
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for (section_iterator si = obj->begin_sections(),
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se = obj->end_sections(); si != se; si.increment(err)) {
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Check(err);
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bool isFirstRelocation = true;
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unsigned SectionID = 0;
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StubMap Stubs;
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for (relocation_iterator i = si->begin_relocations(),
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e = si->end_relocations(); i != e; i.increment(err)) {
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Check(err);
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// If it's first relocation in this section, find its SectionID
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if (isFirstRelocation) {
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SectionID = findOrEmitSection(*si, true, LocalSections);
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DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n");
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isFirstRelocation = false;
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}
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ObjRelocationInfo RI;
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RI.SectionID = SectionID;
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Check(i->getAdditionalInfo(RI.AdditionalInfo));
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Check(i->getOffset(RI.Offset));
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Check(i->getSymbol(RI.Symbol));
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Check(i->getType(RI.Type));
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DEBUG(dbgs() << "\t\tAddend: " << RI.AdditionalInfo
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<< " Offset: " << format("%p", (uintptr_t)RI.Offset)
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<< " Type: " << (uint32_t)(RI.Type & 0xffffffffL)
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<< "\n");
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processRelocationRef(RI, *obj, LocalSections, LocalSymbols, Stubs);
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}
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}
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return false;
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}
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unsigned RuntimeDyldImpl::emitSection(const SectionRef &Section,
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bool IsCode) {
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unsigned StubBufSize = 0,
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StubSize = getMaxStubSize();
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error_code err;
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if (StubSize > 0) {
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for (relocation_iterator i = Section.begin_relocations(),
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e = Section.end_relocations(); i != e; i.increment(err))
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StubBufSize += StubSize;
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}
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StringRef data;
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uint64_t Alignment64;
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Check(Section.getContents(data));
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Check(Section.getAlignment(Alignment64));
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unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
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unsigned DataSize = data.size();
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unsigned Allocate = DataSize + StubBufSize;
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unsigned SectionID = Sections.size();
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const char *pData = data.data();
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uint8_t *Addr = IsCode
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? MemMgr->allocateCodeSection(Allocate, Alignment, SectionID)
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: MemMgr->allocateDataSection(Allocate, Alignment, SectionID);
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memcpy(Addr, pData, DataSize);
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DEBUG(dbgs() << "emitSection SectionID: " << SectionID
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<< " obj addr: " << format("%p", pData)
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<< " new addr: " << format("%p", Addr)
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<< " DataSize: " << DataSize
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<< " StubBufSize: " << StubBufSize
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<< " Allocate: " << Allocate
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<< "\n");
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Sections.push_back(SectionEntry(Addr, Allocate, DataSize,(uintptr_t)pData));
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return SectionID;
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}
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unsigned RuntimeDyldImpl::findOrEmitSection(const SectionRef &Section,
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bool IsCode,
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ObjSectionToIDMap &LocalSections) {
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unsigned SectionID = 0;
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ObjSectionToIDMap::iterator i = LocalSections.find(Section);
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if (i != LocalSections.end())
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SectionID = i->second;
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else {
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SectionID = emitSection(Section, IsCode);
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LocalSections[Section] = SectionID;
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}
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return SectionID;
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}
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void RuntimeDyldImpl::AddRelocation(const RelocationValueRef &Value,
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unsigned SectionID, uintptr_t Offset,
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uint32_t RelType) {
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DEBUG(dbgs() << "AddRelocation SymNamePtr: " << format("%p", Value.SymbolName)
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<< " SID: " << Value.SectionID
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<< " Addend: " << format("%p", Value.Addend)
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<< " Offset: " << format("%p", Offset)
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<< " RelType: " << format("%x", RelType)
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<< "\n");
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if (Value.SymbolName == 0) {
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Relocations[Value.SectionID].push_back(RelocationEntry(
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SectionID,
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Offset,
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RelType,
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Value.Addend));
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} else
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SymbolRelocations[Value.SymbolName].push_back(RelocationEntry(
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SectionID,
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Offset,
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RelType,
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Value.Addend));
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}
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uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr) {
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// TODO: There is only ARM far stub now. We should add the Thumb stub,
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// and stubs for branches Thumb - ARM and ARM - Thumb.
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if (Arch == Triple::arm) {
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uint32_t *StubAddr = (uint32_t*)Addr;
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*StubAddr = 0xe51ff004; // ldr pc,<label>
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return (uint8_t*)++StubAddr;
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}
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else
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return Addr;
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}
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// Assign an address to a symbol name and resolve all the relocations
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// associated with it.
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void RuntimeDyldImpl::reassignSectionAddress(unsigned SectionID,
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uint64_t Addr) {
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// The address to use for relocation resolution is not
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// the address of the local section buffer. We must be doing
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// a remote execution environment of some sort. Re-apply any
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// relocations referencing this section with the given address.
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//
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// Addr is a uint64_t because we can't assume the pointer width
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// of the target is the same as that of the host. Just use a generic
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// "big enough" type.
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Sections[SectionID].LoadAddress = Addr;
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DEBUG(dbgs() << "Resolving relocations Section #" << SectionID
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<< "\t" << format("%p", (uint8_t *)Addr)
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<< "\n");
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resolveRelocationList(Relocations[SectionID], Addr);
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}
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void RuntimeDyldImpl::resolveRelocationEntry(const RelocationEntry &RE,
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uint64_t Value) {
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uint8_t *Target = Sections[RE.SectionID].Address + RE.Offset;
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DEBUG(dbgs() << "\tSectionID: " << RE.SectionID
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<< " + " << RE.Offset << " (" << format("%p", Target) << ")"
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<< " Data: " << RE.Data
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<< " Addend: " << RE.Addend
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<< "\n");
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resolveRelocation(Target, Sections[RE.SectionID].LoadAddress + RE.Offset,
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Value, RE.Data, RE.Addend);
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}
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void RuntimeDyldImpl::resolveRelocationList(const RelocationList &Relocs,
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uint64_t Value) {
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for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
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resolveRelocationEntry(Relocs[i], Value);
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}
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}
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// resolveSymbols - Resolve any relocations to the specified symbols if
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// we know where it lives.
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void RuntimeDyldImpl::resolveSymbols() {
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StringMap<RelocationList>::iterator i = SymbolRelocations.begin(),
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e = SymbolRelocations.end();
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for (; i != e; i++) {
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StringRef Name = i->first();
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RelocationList &Relocs = i->second;
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StringMap<SymbolLoc>::const_iterator Loc = SymbolTable.find(Name);
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if (Loc == SymbolTable.end()) {
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// This is an external symbol, try to get it address from
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// MemoryManager.
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uint8_t *Addr = (uint8_t*) MemMgr->getPointerToNamedFunction(Name.data(),
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true);
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DEBUG(dbgs() << "Resolving relocations Name: " << Name
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<< "\t" << format("%p", Addr)
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<< "\n");
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resolveRelocationList(Relocs, (uintptr_t)Addr);
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} else {
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// Change the relocation to be section relative rather than symbol
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// relative and move it to the resolved relocation list.
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DEBUG(dbgs() << "Resolving symbol '" << Name << "'\n");
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for (int i = 0, e = Relocs.size(); i != e; ++i) {
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RelocationEntry Entry = Relocs[i];
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Entry.Addend += Loc->second.second;
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Relocations[Loc->second.first].push_back(Entry);
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}
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Relocs.clear();
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}
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}
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}
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//===----------------------------------------------------------------------===//
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// RuntimeDyld class implementation
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RuntimeDyld::RuntimeDyld(RTDyldMemoryManager *mm) {
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