1 //===-- RuntimeDyld.cpp - Run-time dynamic linker for MC-JIT ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Implementation of the MC-JIT runtime dynamic linker.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "dyld"
15 #include "llvm/ExecutionEngine/RuntimeDyld.h"
16 #include "JITRegistrar.h"
17 #include "ObjectImageCommon.h"
18 #include "RuntimeDyldELF.h"
19 #include "RuntimeDyldImpl.h"
20 #include "RuntimeDyldMachO.h"
21 #include "llvm/Object/ELF.h"
22 #include "llvm/Support/MathExtras.h"
23 #include "llvm/Support/MutexGuard.h"
26 using namespace llvm::object;
28 // Empty out-of-line virtual destructor as the key function.
29 RuntimeDyldImpl::~RuntimeDyldImpl() {}
31 // Pin the JITRegistrar's and ObjectImage*'s vtables to this file.
32 void JITRegistrar::anchor() {}
33 void ObjectImage::anchor() {}
34 void ObjectImageCommon::anchor() {}
38 void RuntimeDyldImpl::registerEHFrames() {}
40 void RuntimeDyldImpl::deregisterEHFrames() {}
42 // Resolve the relocations for all symbols we currently know about.
43 void RuntimeDyldImpl::resolveRelocations() {
44 MutexGuard locked(lock);
46 // First, resolve relocations associated with external symbols.
47 resolveExternalSymbols();
49 // Just iterate over the sections we have and resolve all the relocations
50 // in them. Gross overkill, but it gets the job done.
51 for (int i = 0, e = Sections.size(); i != e; ++i) {
52 // The Section here (Sections[i]) refers to the section in which the
53 // symbol for the relocation is located. The SectionID in the relocation
54 // entry provides the section to which the relocation will be applied.
55 uint64_t Addr = Sections[i].LoadAddress;
56 DEBUG(dbgs() << "Resolving relocations Section #" << i << "\t"
57 << format("%p", (uint8_t *)Addr) << "\n");
58 resolveRelocationList(Relocations[i], Addr);
63 void RuntimeDyldImpl::mapSectionAddress(const void *LocalAddress,
64 uint64_t TargetAddress) {
65 MutexGuard locked(lock);
66 for (unsigned i = 0, e = Sections.size(); i != e; ++i) {
67 if (Sections[i].Address == LocalAddress) {
68 reassignSectionAddress(i, TargetAddress);
72 llvm_unreachable("Attempting to remap address of unknown section!");
75 static error_code getOffset(const SymbolRef &Sym, uint64_t &Result) {
77 if (error_code EC = Sym.getAddress(Address))
80 if (Address == UnknownAddressOrSize) {
81 Result = UnknownAddressOrSize;
82 return object_error::success;
85 const ObjectFile *Obj = Sym.getObject();
86 section_iterator SecI(Obj->section_begin());
87 if (error_code EC = Sym.getSection(SecI))
90 if (SecI == Obj->section_end()) {
91 Result = UnknownAddressOrSize;
92 return object_error::success;
95 uint64_t SectionAddress;
96 if (error_code EC = SecI->getAddress(SectionAddress))
99 Result = Address - SectionAddress;
100 return object_error::success;
103 ObjectImage *RuntimeDyldImpl::loadObject(ObjectImage *InputObject) {
104 MutexGuard locked(lock);
106 std::unique_ptr<ObjectImage> Obj(InputObject);
110 // Save information about our target
111 Arch = (Triple::ArchType)Obj->getArch();
112 IsTargetLittleEndian = Obj->getObjectFile()->isLittleEndian();
114 // Compute the memory size required to load all sections to be loaded
115 // and pass this information to the memory manager
116 if (MemMgr->needsToReserveAllocationSpace()) {
117 uint64_t CodeSize = 0, DataSizeRO = 0, DataSizeRW = 0;
118 computeTotalAllocSize(*Obj, CodeSize, DataSizeRO, DataSizeRW);
119 MemMgr->reserveAllocationSpace(CodeSize, DataSizeRO, DataSizeRW);
122 // Symbols found in this object
123 StringMap<SymbolLoc> LocalSymbols;
124 // Used sections from the object file
125 ObjSectionToIDMap LocalSections;
127 // Common symbols requiring allocation, with their sizes and alignments
128 CommonSymbolMap CommonSymbols;
129 // Maximum required total memory to allocate all common symbols
130 uint64_t CommonSize = 0;
133 DEBUG(dbgs() << "Parse symbols:\n");
134 for (symbol_iterator I = Obj->begin_symbols(), E = Obj->end_symbols(); I != E;
136 object::SymbolRef::Type SymType;
138 Check(I->getType(SymType));
139 Check(I->getName(Name));
141 uint32_t Flags = I->getFlags();
143 bool IsCommon = Flags & SymbolRef::SF_Common;
145 // Add the common symbols to a list. We'll allocate them all below.
147 Check(I->getAlignment(Align));
149 Check(I->getSize(Size));
150 CommonSize += Size + Align;
151 CommonSymbols[*I] = CommonSymbolInfo(Size, Align);
153 if (SymType == object::SymbolRef::ST_Function ||
154 SymType == object::SymbolRef::ST_Data ||
155 SymType == object::SymbolRef::ST_Unknown) {
157 StringRef SectionData;
159 section_iterator SI = Obj->end_sections();
160 Check(getOffset(*I, SectOffset));
161 Check(I->getSection(SI));
162 if (SI == Obj->end_sections())
164 Check(SI->getContents(SectionData));
165 Check(SI->isText(IsCode));
167 findOrEmitSection(*Obj, *SI, IsCode, LocalSections);
168 LocalSymbols[Name.data()] = SymbolLoc(SectionID, SectOffset);
169 DEBUG(dbgs() << "\tOffset: " << format("%p", (uintptr_t)SectOffset)
170 << " flags: " << Flags << " SID: " << SectionID);
171 GlobalSymbolTable[Name] = SymbolLoc(SectionID, SectOffset);
174 DEBUG(dbgs() << "\tType: " << SymType << " Name: " << Name << "\n");
177 // Allocate common symbols
179 emitCommonSymbols(*Obj, CommonSymbols, CommonSize, LocalSymbols);
181 // Parse and process relocations
182 DEBUG(dbgs() << "Parse relocations:\n");
183 for (section_iterator SI = Obj->begin_sections(), SE = Obj->end_sections();
185 unsigned SectionID = 0;
187 section_iterator RelocatedSection = SI->getRelocatedSection();
189 relocation_iterator I = SI->relocation_begin();
190 relocation_iterator E = SI->relocation_end();
192 if (I == E && !ProcessAllSections)
196 Check(RelocatedSection->isText(IsCode));
198 findOrEmitSection(*Obj, *RelocatedSection, IsCode, LocalSections);
199 DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n");
202 I = processRelocationRef(SectionID, I, *Obj, LocalSections, LocalSymbols,
206 // Give the subclasses a chance to tie-up any loose ends.
207 finalizeLoad(LocalSections);
209 return Obj.release();
212 // A helper method for computeTotalAllocSize.
213 // Computes the memory size required to allocate sections with the given sizes,
214 // assuming that all sections are allocated with the given alignment
216 computeAllocationSizeForSections(std::vector<uint64_t> &SectionSizes,
217 uint64_t Alignment) {
218 uint64_t TotalSize = 0;
219 for (size_t Idx = 0, Cnt = SectionSizes.size(); Idx < Cnt; Idx++) {
220 uint64_t AlignedSize =
221 (SectionSizes[Idx] + Alignment - 1) / Alignment * Alignment;
222 TotalSize += AlignedSize;
227 // Compute an upper bound of the memory size that is required to load all
229 void RuntimeDyldImpl::computeTotalAllocSize(ObjectImage &Obj,
231 uint64_t &DataSizeRO,
232 uint64_t &DataSizeRW) {
233 // Compute the size of all sections required for execution
234 std::vector<uint64_t> CodeSectionSizes;
235 std::vector<uint64_t> ROSectionSizes;
236 std::vector<uint64_t> RWSectionSizes;
237 uint64_t MaxAlignment = sizeof(void *);
239 // Collect sizes of all sections to be loaded;
240 // also determine the max alignment of all sections
241 for (section_iterator SI = Obj.begin_sections(), SE = Obj.end_sections();
243 const SectionRef &Section = *SI;
246 Check(Section.isRequiredForExecution(IsRequired));
248 // Consider only the sections that are required to be loaded for execution
250 uint64_t DataSize = 0;
251 uint64_t Alignment64 = 0;
253 bool IsReadOnly = false;
255 Check(Section.getSize(DataSize));
256 Check(Section.getAlignment(Alignment64));
257 Check(Section.isText(IsCode));
258 Check(Section.isReadOnlyData(IsReadOnly));
259 Check(Section.getName(Name));
260 unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
262 uint64_t StubBufSize = computeSectionStubBufSize(Obj, Section);
263 uint64_t SectionSize = DataSize + StubBufSize;
265 // The .eh_frame section (at least on Linux) needs an extra four bytes
267 // with zeroes added at the end. For MachO objects, this section has a
268 // slightly different name, so this won't have any effect for MachO
270 if (Name == ".eh_frame")
273 if (SectionSize > 0) {
274 // save the total size of the section
276 CodeSectionSizes.push_back(SectionSize);
277 } else if (IsReadOnly) {
278 ROSectionSizes.push_back(SectionSize);
280 RWSectionSizes.push_back(SectionSize);
282 // update the max alignment
283 if (Alignment > MaxAlignment) {
284 MaxAlignment = Alignment;
290 // Compute the size of all common symbols
291 uint64_t CommonSize = 0;
292 for (symbol_iterator I = Obj.begin_symbols(), E = Obj.end_symbols(); I != E;
294 uint32_t Flags = I->getFlags();
295 if (Flags & SymbolRef::SF_Common) {
296 // Add the common symbols to a list. We'll allocate them all below.
298 Check(I->getSize(Size));
302 if (CommonSize != 0) {
303 RWSectionSizes.push_back(CommonSize);
306 // Compute the required allocation space for each different type of sections
307 // (code, read-only data, read-write data) assuming that all sections are
308 // allocated with the max alignment. Note that we cannot compute with the
309 // individual alignments of the sections, because then the required size
310 // depends on the order, in which the sections are allocated.
311 CodeSize = computeAllocationSizeForSections(CodeSectionSizes, MaxAlignment);
312 DataSizeRO = computeAllocationSizeForSections(ROSectionSizes, MaxAlignment);
313 DataSizeRW = computeAllocationSizeForSections(RWSectionSizes, MaxAlignment);
316 // compute stub buffer size for the given section
317 unsigned RuntimeDyldImpl::computeSectionStubBufSize(ObjectImage &Obj,
318 const SectionRef &Section) {
319 unsigned StubSize = getMaxStubSize();
323 // FIXME: this is an inefficient way to handle this. We should computed the
324 // necessary section allocation size in loadObject by walking all the sections
326 unsigned StubBufSize = 0;
327 for (section_iterator SI = Obj.begin_sections(), SE = Obj.end_sections();
329 section_iterator RelSecI = SI->getRelocatedSection();
330 if (!(RelSecI == Section))
333 for (const RelocationRef &Reloc : SI->relocations()) {
335 StubBufSize += StubSize;
339 // Get section data size and alignment
340 uint64_t Alignment64;
342 Check(Section.getSize(DataSize));
343 Check(Section.getAlignment(Alignment64));
345 // Add stubbuf size alignment
346 unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
347 unsigned StubAlignment = getStubAlignment();
348 unsigned EndAlignment = (DataSize | Alignment) & -(DataSize | Alignment);
349 if (StubAlignment > EndAlignment)
350 StubBufSize += StubAlignment - EndAlignment;
354 void RuntimeDyldImpl::emitCommonSymbols(ObjectImage &Obj,
355 const CommonSymbolMap &CommonSymbols,
357 SymbolTableMap &SymbolTable) {
358 // Allocate memory for the section
359 unsigned SectionID = Sections.size();
360 uint8_t *Addr = MemMgr->allocateDataSection(TotalSize, sizeof(void *),
361 SectionID, StringRef(), false);
363 report_fatal_error("Unable to allocate memory for common symbols!");
365 Sections.push_back(SectionEntry(StringRef(), Addr, TotalSize, 0));
366 memset(Addr, 0, TotalSize);
368 DEBUG(dbgs() << "emitCommonSection SectionID: " << SectionID << " new addr: "
369 << format("%p", Addr) << " DataSize: " << TotalSize << "\n");
371 // Assign the address of each symbol
372 for (CommonSymbolMap::const_iterator it = CommonSymbols.begin(),
373 itEnd = CommonSymbols.end(); it != itEnd; ++it) {
374 uint64_t Size = it->second.first;
375 uint64_t Align = it->second.second;
377 it->first.getName(Name);
379 // This symbol has an alignment requirement.
380 uint64_t AlignOffset = OffsetToAlignment((uint64_t)Addr, Align);
382 Offset += AlignOffset;
383 DEBUG(dbgs() << "Allocating common symbol " << Name << " address "
384 << format("%p\n", Addr));
386 Obj.updateSymbolAddress(it->first, (uint64_t)Addr);
387 SymbolTable[Name.data()] = SymbolLoc(SectionID, Offset);
393 unsigned RuntimeDyldImpl::emitSection(ObjectImage &Obj,
394 const SectionRef &Section, bool IsCode) {
397 uint64_t Alignment64;
398 Check(Section.getContents(data));
399 Check(Section.getAlignment(Alignment64));
401 unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
407 unsigned PaddingSize = 0;
408 unsigned StubBufSize = 0;
410 Check(Section.isRequiredForExecution(IsRequired));
411 Check(Section.isVirtual(IsVirtual));
412 Check(Section.isZeroInit(IsZeroInit));
413 Check(Section.isReadOnlyData(IsReadOnly));
414 Check(Section.getSize(DataSize));
415 Check(Section.getName(Name));
417 StubBufSize = computeSectionStubBufSize(Obj, Section);
419 // The .eh_frame section (at least on Linux) needs an extra four bytes padded
420 // with zeroes added at the end. For MachO objects, this section has a
421 // slightly different name, so this won't have any effect for MachO objects.
422 if (Name == ".eh_frame")
426 unsigned SectionID = Sections.size();
428 const char *pData = 0;
430 // Some sections, such as debug info, don't need to be loaded for execution.
431 // Leave those where they are.
433 Allocate = DataSize + PaddingSize + StubBufSize;
434 Addr = IsCode ? MemMgr->allocateCodeSection(Allocate, Alignment, SectionID,
436 : MemMgr->allocateDataSection(Allocate, Alignment, SectionID,
439 report_fatal_error("Unable to allocate section memory!");
441 // Virtual sections have no data in the object image, so leave pData = 0
445 // Zero-initialize or copy the data from the image
446 if (IsZeroInit || IsVirtual)
447 memset(Addr, 0, DataSize);
449 memcpy(Addr, pData, DataSize);
451 // Fill in any extra bytes we allocated for padding
452 if (PaddingSize != 0) {
453 memset(Addr + DataSize, 0, PaddingSize);
454 // Update the DataSize variable so that the stub offset is set correctly.
455 DataSize += PaddingSize;
458 DEBUG(dbgs() << "emitSection SectionID: " << SectionID << " Name: " << Name
459 << " obj addr: " << format("%p", pData)
460 << " new addr: " << format("%p", Addr)
461 << " DataSize: " << DataSize << " StubBufSize: " << StubBufSize
462 << " Allocate: " << Allocate << "\n");
463 Obj.updateSectionAddress(Section, (uint64_t)Addr);
465 // Even if we didn't load the section, we need to record an entry for it
466 // to handle later processing (and by 'handle' I mean don't do anything
467 // with these sections).
470 DEBUG(dbgs() << "emitSection SectionID: " << SectionID << " Name: " << Name
471 << " obj addr: " << format("%p", data.data()) << " new addr: 0"
472 << " DataSize: " << DataSize << " StubBufSize: " << StubBufSize
473 << " Allocate: " << Allocate << "\n");
476 Sections.push_back(SectionEntry(Name, Addr, DataSize, (uintptr_t)pData));
480 unsigned RuntimeDyldImpl::findOrEmitSection(ObjectImage &Obj,
481 const SectionRef &Section,
483 ObjSectionToIDMap &LocalSections) {
485 unsigned SectionID = 0;
486 ObjSectionToIDMap::iterator i = LocalSections.find(Section);
487 if (i != LocalSections.end())
488 SectionID = i->second;
490 SectionID = emitSection(Obj, Section, IsCode);
491 LocalSections[Section] = SectionID;
496 void RuntimeDyldImpl::addRelocationForSection(const RelocationEntry &RE,
497 unsigned SectionID) {
498 Relocations[SectionID].push_back(RE);
501 void RuntimeDyldImpl::addRelocationForSymbol(const RelocationEntry &RE,
502 StringRef SymbolName) {
503 // Relocation by symbol. If the symbol is found in the global symbol table,
504 // create an appropriate section relocation. Otherwise, add it to
505 // ExternalSymbolRelocations.
506 SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(SymbolName);
507 if (Loc == GlobalSymbolTable.end()) {
508 ExternalSymbolRelocations[SymbolName].push_back(RE);
510 // Copy the RE since we want to modify its addend.
511 RelocationEntry RECopy = RE;
512 RECopy.Addend += Loc->second.second;
513 Relocations[Loc->second.first].push_back(RECopy);
517 uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr) {
518 if (Arch == Triple::aarch64 || Arch == Triple::aarch64_be) {
519 // This stub has to be able to access the full address space,
520 // since symbol lookup won't necessarily find a handy, in-range,
521 // PLT stub for functions which could be anywhere.
522 uint32_t *StubAddr = (uint32_t *)Addr;
524 // Stub can use ip0 (== x16) to calculate address
525 *StubAddr = 0xd2e00010; // movz ip0, #:abs_g3:<addr>
527 *StubAddr = 0xf2c00010; // movk ip0, #:abs_g2_nc:<addr>
529 *StubAddr = 0xf2a00010; // movk ip0, #:abs_g1_nc:<addr>
531 *StubAddr = 0xf2800010; // movk ip0, #:abs_g0_nc:<addr>
533 *StubAddr = 0xd61f0200; // br ip0
536 } else if (Arch == Triple::arm || Arch == Triple::armeb) {
537 // TODO: There is only ARM far stub now. We should add the Thumb stub,
538 // and stubs for branches Thumb - ARM and ARM - Thumb.
539 uint32_t *StubAddr = (uint32_t *)Addr;
540 *StubAddr = 0xe51ff004; // ldr pc,<label>
541 return (uint8_t *)++StubAddr;
542 } else if (Arch == Triple::mipsel || Arch == Triple::mips) {
543 uint32_t *StubAddr = (uint32_t *)Addr;
544 // 0: 3c190000 lui t9,%hi(addr).
545 // 4: 27390000 addiu t9,t9,%lo(addr).
546 // 8: 03200008 jr t9.
548 const unsigned LuiT9Instr = 0x3c190000, AdduiT9Instr = 0x27390000;
549 const unsigned JrT9Instr = 0x03200008, NopInstr = 0x0;
551 *StubAddr = LuiT9Instr;
553 *StubAddr = AdduiT9Instr;
555 *StubAddr = JrT9Instr;
557 *StubAddr = NopInstr;
559 } else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) {
560 // PowerPC64 stub: the address points to a function descriptor
561 // instead of the function itself. Load the function address
562 // on r11 and sets it to control register. Also loads the function
563 // TOC in r2 and environment pointer to r11.
564 writeInt32BE(Addr, 0x3D800000); // lis r12, highest(addr)
565 writeInt32BE(Addr+4, 0x618C0000); // ori r12, higher(addr)
566 writeInt32BE(Addr+8, 0x798C07C6); // sldi r12, r12, 32
567 writeInt32BE(Addr+12, 0x658C0000); // oris r12, r12, h(addr)
568 writeInt32BE(Addr+16, 0x618C0000); // ori r12, r12, l(addr)
569 writeInt32BE(Addr+20, 0xF8410028); // std r2, 40(r1)
570 writeInt32BE(Addr+24, 0xE96C0000); // ld r11, 0(r12)
571 writeInt32BE(Addr+28, 0xE84C0008); // ld r2, 0(r12)
572 writeInt32BE(Addr+32, 0x7D6903A6); // mtctr r11
573 writeInt32BE(Addr+36, 0xE96C0010); // ld r11, 16(r2)
574 writeInt32BE(Addr+40, 0x4E800420); // bctr
577 } else if (Arch == Triple::systemz) {
578 writeInt16BE(Addr, 0xC418); // lgrl %r1,.+8
579 writeInt16BE(Addr+2, 0x0000);
580 writeInt16BE(Addr+4, 0x0004);
581 writeInt16BE(Addr+6, 0x07F1); // brc 15,%r1
582 // 8-byte address stored at Addr + 8
584 } else if (Arch == Triple::x86_64) {
586 *(Addr+1) = 0x25; // rip
587 // 32-bit PC-relative address of the GOT entry will be stored at Addr+2
592 // Assign an address to a symbol name and resolve all the relocations
593 // associated with it.
594 void RuntimeDyldImpl::reassignSectionAddress(unsigned SectionID,
596 // The address to use for relocation resolution is not
597 // the address of the local section buffer. We must be doing
598 // a remote execution environment of some sort. Relocations can't
599 // be applied until all the sections have been moved. The client must
600 // trigger this with a call to MCJIT::finalize() or
601 // RuntimeDyld::resolveRelocations().
603 // Addr is a uint64_t because we can't assume the pointer width
604 // of the target is the same as that of the host. Just use a generic
605 // "big enough" type.
606 Sections[SectionID].LoadAddress = Addr;
609 void RuntimeDyldImpl::resolveRelocationList(const RelocationList &Relocs,
611 for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
612 const RelocationEntry &RE = Relocs[i];
613 // Ignore relocations for sections that were not loaded
614 if (Sections[RE.SectionID].Address == 0)
616 resolveRelocation(RE, Value);
620 void RuntimeDyldImpl::resolveExternalSymbols() {
621 while (!ExternalSymbolRelocations.empty()) {
622 StringMap<RelocationList>::iterator i = ExternalSymbolRelocations.begin();
624 StringRef Name = i->first();
625 if (Name.size() == 0) {
626 // This is an absolute symbol, use an address of zero.
627 DEBUG(dbgs() << "Resolving absolute relocations."
629 RelocationList &Relocs = i->second;
630 resolveRelocationList(Relocs, 0);
633 SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(Name);
634 if (Loc == GlobalSymbolTable.end()) {
635 // This is an external symbol, try to get its address from
637 Addr = MemMgr->getSymbolAddress(Name.data());
638 // The call to getSymbolAddress may have caused additional modules to
639 // be loaded, which may have added new entries to the
640 // ExternalSymbolRelocations map. Consquently, we need to update our
641 // iterator. This is also why retrieval of the relocation list
642 // associated with this symbol is deferred until below this point.
643 // New entries may have been added to the relocation list.
644 i = ExternalSymbolRelocations.find(Name);
646 // We found the symbol in our global table. It was probably in a
647 // Module that we loaded previously.
648 SymbolLoc SymLoc = Loc->second;
649 Addr = getSectionLoadAddress(SymLoc.first) + SymLoc.second;
652 // FIXME: Implement error handling that doesn't kill the host program!
654 report_fatal_error("Program used external function '" + Name +
655 "' which could not be resolved!");
657 updateGOTEntries(Name, Addr);
658 DEBUG(dbgs() << "Resolving relocations Name: " << Name << "\t"
659 << format("0x%lx", Addr) << "\n");
660 // This list may have been updated when we called getSymbolAddress, so
661 // don't change this code to get the list earlier.
662 RelocationList &Relocs = i->second;
663 resolveRelocationList(Relocs, Addr);
666 ExternalSymbolRelocations.erase(i);
670 //===----------------------------------------------------------------------===//
671 // RuntimeDyld class implementation
672 RuntimeDyld::RuntimeDyld(RTDyldMemoryManager *mm) {
673 // FIXME: There's a potential issue lurking here if a single instance of
674 // RuntimeDyld is used to load multiple objects. The current implementation
675 // associates a single memory manager with a RuntimeDyld instance. Even
676 // though the public class spawns a new 'impl' instance for each load,
677 // they share a single memory manager. This can become a problem when page
678 // permissions are applied.
681 ProcessAllSections = false;
684 RuntimeDyld::~RuntimeDyld() { delete Dyld; }
686 static std::unique_ptr<RuntimeDyldELF>
687 createRuntimeDyldELF(RTDyldMemoryManager *MM, bool ProcessAllSections) {
688 std::unique_ptr<RuntimeDyldELF> Dyld(new RuntimeDyldELF(MM));
689 Dyld->setProcessAllSections(ProcessAllSections);
693 static std::unique_ptr<RuntimeDyldMachO>
694 createRuntimeDyldMachO(RTDyldMemoryManager *MM, bool ProcessAllSections) {
695 std::unique_ptr<RuntimeDyldMachO> Dyld(new RuntimeDyldMachO(MM));
696 Dyld->setProcessAllSections(ProcessAllSections);
700 ObjectImage *RuntimeDyld::loadObject(ObjectFile *InputObject) {
701 std::unique_ptr<ObjectImage> InputImage;
703 if (InputObject->isELF()) {
704 InputImage.reset(RuntimeDyldELF::createObjectImageFromFile(InputObject));
706 Dyld = createRuntimeDyldELF(MM, ProcessAllSections).release();
707 } else if (InputObject->isMachO()) {
708 InputImage.reset(RuntimeDyldMachO::createObjectImageFromFile(InputObject));
710 Dyld = createRuntimeDyldMachO(MM, ProcessAllSections).release();
712 report_fatal_error("Incompatible object format!");
714 if (!Dyld->isCompatibleFile(InputObject))
715 report_fatal_error("Incompatible object format!");
717 Dyld->loadObject(InputImage.get());
718 return InputImage.release();
721 ObjectImage *RuntimeDyld::loadObject(ObjectBuffer *InputBuffer) {
722 std::unique_ptr<ObjectImage> InputImage;
723 sys::fs::file_magic Type = sys::fs::identify_magic(InputBuffer->getBuffer());
726 case sys::fs::file_magic::elf_relocatable:
727 case sys::fs::file_magic::elf_executable:
728 case sys::fs::file_magic::elf_shared_object:
729 case sys::fs::file_magic::elf_core:
730 InputImage.reset(RuntimeDyldELF::createObjectImage(InputBuffer));
732 Dyld = createRuntimeDyldELF(MM, ProcessAllSections).release();
734 case sys::fs::file_magic::macho_object:
735 case sys::fs::file_magic::macho_executable:
736 case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
737 case sys::fs::file_magic::macho_core:
738 case sys::fs::file_magic::macho_preload_executable:
739 case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
740 case sys::fs::file_magic::macho_dynamic_linker:
741 case sys::fs::file_magic::macho_bundle:
742 case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
743 case sys::fs::file_magic::macho_dsym_companion:
744 InputImage.reset(RuntimeDyldMachO::createObjectImage(InputBuffer));
746 Dyld = createRuntimeDyldMachO(MM, ProcessAllSections).release();
748 case sys::fs::file_magic::unknown:
749 case sys::fs::file_magic::bitcode:
750 case sys::fs::file_magic::archive:
751 case sys::fs::file_magic::coff_object:
752 case sys::fs::file_magic::coff_import_library:
753 case sys::fs::file_magic::pecoff_executable:
754 case sys::fs::file_magic::macho_universal_binary:
755 case sys::fs::file_magic::windows_resource:
756 report_fatal_error("Incompatible object format!");
759 if (!Dyld->isCompatibleFormat(InputBuffer))
760 report_fatal_error("Incompatible object format!");
762 Dyld->loadObject(InputImage.get());
763 return InputImage.release();
766 void *RuntimeDyld::getSymbolAddress(StringRef Name) {
769 return Dyld->getSymbolAddress(Name);
772 uint64_t RuntimeDyld::getSymbolLoadAddress(StringRef Name) {
775 return Dyld->getSymbolLoadAddress(Name);
778 void RuntimeDyld::resolveRelocations() { Dyld->resolveRelocations(); }
780 void RuntimeDyld::reassignSectionAddress(unsigned SectionID, uint64_t Addr) {
781 Dyld->reassignSectionAddress(SectionID, Addr);
784 void RuntimeDyld::mapSectionAddress(const void *LocalAddress,
785 uint64_t TargetAddress) {
786 Dyld->mapSectionAddress(LocalAddress, TargetAddress);
789 bool RuntimeDyld::hasError() { return Dyld->hasError(); }
791 StringRef RuntimeDyld::getErrorString() { return Dyld->getErrorString(); }
793 void RuntimeDyld::registerEHFrames() {
795 Dyld->registerEHFrames();
798 void RuntimeDyld::deregisterEHFrames() {
800 Dyld->deregisterEHFrames();
803 } // end namespace llvm