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 #include "llvm/ExecutionEngine/RuntimeDyld.h"
15 #include "JITRegistrar.h"
16 #include "ObjectImageCommon.h"
17 #include "RuntimeDyldELF.h"
18 #include "RuntimeDyldImpl.h"
19 #include "RuntimeDyldMachO.h"
20 #include "llvm/Object/ELF.h"
21 #include "llvm/Support/MathExtras.h"
22 #include "llvm/Support/MutexGuard.h"
25 using namespace llvm::object;
26 using std::error_code;
28 #define DEBUG_TYPE "dyld"
30 // Empty out-of-line virtual destructor as the key function.
31 RuntimeDyldImpl::~RuntimeDyldImpl() {}
33 // Pin the JITRegistrar's and ObjectImage*'s vtables to this file.
34 void JITRegistrar::anchor() {}
35 void ObjectImage::anchor() {}
36 void ObjectImageCommon::anchor() {}
40 void RuntimeDyldImpl::registerEHFrames() {}
42 void RuntimeDyldImpl::deregisterEHFrames() {}
44 // Resolve the relocations for all symbols we currently know about.
45 void RuntimeDyldImpl::resolveRelocations() {
46 MutexGuard locked(lock);
48 // First, resolve relocations associated with external symbols.
49 resolveExternalSymbols();
51 // Just iterate over the sections we have and resolve all the relocations
52 // in them. Gross overkill, but it gets the job done.
53 for (int i = 0, e = Sections.size(); i != e; ++i) {
54 // The Section here (Sections[i]) refers to the section in which the
55 // symbol for the relocation is located. The SectionID in the relocation
56 // entry provides the section to which the relocation will be applied.
57 uint64_t Addr = Sections[i].LoadAddress;
58 DEBUG(dbgs() << "Resolving relocations Section #" << i << "\t"
59 << format("%p", (uint8_t *)Addr) << "\n");
60 resolveRelocationList(Relocations[i], Addr);
65 void RuntimeDyldImpl::mapSectionAddress(const void *LocalAddress,
66 uint64_t TargetAddress) {
67 MutexGuard locked(lock);
68 for (unsigned i = 0, e = Sections.size(); i != e; ++i) {
69 if (Sections[i].Address == LocalAddress) {
70 reassignSectionAddress(i, TargetAddress);
74 llvm_unreachable("Attempting to remap address of unknown section!");
77 static error_code getOffset(const SymbolRef &Sym, uint64_t &Result) {
79 if (error_code EC = Sym.getAddress(Address))
82 if (Address == UnknownAddressOrSize) {
83 Result = UnknownAddressOrSize;
84 return object_error::success;
87 const ObjectFile *Obj = Sym.getObject();
88 section_iterator SecI(Obj->section_begin());
89 if (error_code EC = Sym.getSection(SecI))
92 if (SecI == Obj->section_end()) {
93 Result = UnknownAddressOrSize;
94 return object_error::success;
97 uint64_t SectionAddress;
98 if (error_code EC = SecI->getAddress(SectionAddress))
101 Result = Address - SectionAddress;
102 return object_error::success;
105 ObjectImage *RuntimeDyldImpl::loadObject(ObjectImage *InputObject) {
106 MutexGuard locked(lock);
108 std::unique_ptr<ObjectImage> Obj(InputObject);
112 // Save information about our target
113 Arch = (Triple::ArchType)Obj->getArch();
114 IsTargetLittleEndian = Obj->getObjectFile()->isLittleEndian();
116 // Compute the memory size required to load all sections to be loaded
117 // and pass this information to the memory manager
118 if (MemMgr->needsToReserveAllocationSpace()) {
119 uint64_t CodeSize = 0, DataSizeRO = 0, DataSizeRW = 0;
120 computeTotalAllocSize(*Obj, CodeSize, DataSizeRO, DataSizeRW);
121 MemMgr->reserveAllocationSpace(CodeSize, DataSizeRO, DataSizeRW);
124 // Symbols found in this object
125 StringMap<SymbolLoc> LocalSymbols;
126 // Used sections from the object file
127 ObjSectionToIDMap LocalSections;
129 // Common symbols requiring allocation, with their sizes and alignments
130 CommonSymbolMap CommonSymbols;
131 // Maximum required total memory to allocate all common symbols
132 uint64_t CommonSize = 0;
135 DEBUG(dbgs() << "Parse symbols:\n");
136 for (symbol_iterator I = Obj->begin_symbols(), E = Obj->end_symbols(); I != E;
138 object::SymbolRef::Type SymType;
140 Check(I->getType(SymType));
141 Check(I->getName(Name));
143 uint32_t Flags = I->getFlags();
145 bool IsCommon = Flags & SymbolRef::SF_Common;
147 // Add the common symbols to a list. We'll allocate them all below.
148 if (!GlobalSymbolTable.count(Name)) {
150 Check(I->getAlignment(Align));
152 Check(I->getSize(Size));
153 CommonSize += Size + Align;
154 CommonSymbols[*I] = CommonSymbolInfo(Size, Align);
157 if (SymType == object::SymbolRef::ST_Function ||
158 SymType == object::SymbolRef::ST_Data ||
159 SymType == object::SymbolRef::ST_Unknown) {
161 StringRef SectionData;
163 section_iterator SI = Obj->end_sections();
164 Check(getOffset(*I, SectOffset));
165 Check(I->getSection(SI));
166 if (SI == Obj->end_sections())
168 Check(SI->getContents(SectionData));
169 Check(SI->isText(IsCode));
171 findOrEmitSection(*Obj, *SI, IsCode, LocalSections);
172 LocalSymbols[Name.data()] = SymbolLoc(SectionID, SectOffset);
173 DEBUG(dbgs() << "\tOffset: " << format("%p", (uintptr_t)SectOffset)
174 << " flags: " << Flags << " SID: " << SectionID);
175 GlobalSymbolTable[Name] = SymbolLoc(SectionID, SectOffset);
178 DEBUG(dbgs() << "\tType: " << SymType << " Name: " << Name << "\n");
181 // Allocate common symbols
183 emitCommonSymbols(*Obj, CommonSymbols, CommonSize, GlobalSymbolTable);
185 // Parse and process relocations
186 DEBUG(dbgs() << "Parse relocations:\n");
187 for (section_iterator SI = Obj->begin_sections(), SE = Obj->end_sections();
189 unsigned SectionID = 0;
191 section_iterator RelocatedSection = SI->getRelocatedSection();
193 relocation_iterator I = SI->relocation_begin();
194 relocation_iterator E = SI->relocation_end();
196 if (I == E && !ProcessAllSections)
200 Check(RelocatedSection->isText(IsCode));
202 findOrEmitSection(*Obj, *RelocatedSection, IsCode, LocalSections);
203 DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n");
206 I = processRelocationRef(SectionID, I, *Obj, LocalSections, LocalSymbols,
210 // Give the subclasses a chance to tie-up any loose ends.
211 finalizeLoad(*Obj, LocalSections);
213 return Obj.release();
216 // A helper method for computeTotalAllocSize.
217 // Computes the memory size required to allocate sections with the given sizes,
218 // assuming that all sections are allocated with the given alignment
220 computeAllocationSizeForSections(std::vector<uint64_t> &SectionSizes,
221 uint64_t Alignment) {
222 uint64_t TotalSize = 0;
223 for (size_t Idx = 0, Cnt = SectionSizes.size(); Idx < Cnt; Idx++) {
224 uint64_t AlignedSize =
225 (SectionSizes[Idx] + Alignment - 1) / Alignment * Alignment;
226 TotalSize += AlignedSize;
231 // Compute an upper bound of the memory size that is required to load all
233 void RuntimeDyldImpl::computeTotalAllocSize(ObjectImage &Obj,
235 uint64_t &DataSizeRO,
236 uint64_t &DataSizeRW) {
237 // Compute the size of all sections required for execution
238 std::vector<uint64_t> CodeSectionSizes;
239 std::vector<uint64_t> ROSectionSizes;
240 std::vector<uint64_t> RWSectionSizes;
241 uint64_t MaxAlignment = sizeof(void *);
243 // Collect sizes of all sections to be loaded;
244 // also determine the max alignment of all sections
245 for (section_iterator SI = Obj.begin_sections(), SE = Obj.end_sections();
247 const SectionRef &Section = *SI;
250 Check(Section.isRequiredForExecution(IsRequired));
252 // Consider only the sections that are required to be loaded for execution
254 uint64_t DataSize = 0;
255 uint64_t Alignment64 = 0;
257 bool IsReadOnly = false;
259 Check(Section.getSize(DataSize));
260 Check(Section.getAlignment(Alignment64));
261 Check(Section.isText(IsCode));
262 Check(Section.isReadOnlyData(IsReadOnly));
263 Check(Section.getName(Name));
264 unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
266 uint64_t StubBufSize = computeSectionStubBufSize(Obj, Section);
267 uint64_t SectionSize = DataSize + StubBufSize;
269 // The .eh_frame section (at least on Linux) needs an extra four bytes
271 // with zeroes added at the end. For MachO objects, this section has a
272 // slightly different name, so this won't have any effect for MachO
274 if (Name == ".eh_frame")
277 if (SectionSize > 0) {
278 // save the total size of the section
280 CodeSectionSizes.push_back(SectionSize);
281 } else if (IsReadOnly) {
282 ROSectionSizes.push_back(SectionSize);
284 RWSectionSizes.push_back(SectionSize);
286 // update the max alignment
287 if (Alignment > MaxAlignment) {
288 MaxAlignment = Alignment;
294 // Compute the size of all common symbols
295 uint64_t CommonSize = 0;
296 for (symbol_iterator I = Obj.begin_symbols(), E = Obj.end_symbols(); I != E;
298 uint32_t Flags = I->getFlags();
299 if (Flags & SymbolRef::SF_Common) {
300 // Add the common symbols to a list. We'll allocate them all below.
302 Check(I->getSize(Size));
306 if (CommonSize != 0) {
307 RWSectionSizes.push_back(CommonSize);
310 // Compute the required allocation space for each different type of sections
311 // (code, read-only data, read-write data) assuming that all sections are
312 // allocated with the max alignment. Note that we cannot compute with the
313 // individual alignments of the sections, because then the required size
314 // depends on the order, in which the sections are allocated.
315 CodeSize = computeAllocationSizeForSections(CodeSectionSizes, MaxAlignment);
316 DataSizeRO = computeAllocationSizeForSections(ROSectionSizes, MaxAlignment);
317 DataSizeRW = computeAllocationSizeForSections(RWSectionSizes, MaxAlignment);
320 // compute stub buffer size for the given section
321 unsigned RuntimeDyldImpl::computeSectionStubBufSize(ObjectImage &Obj,
322 const SectionRef &Section) {
323 unsigned StubSize = getMaxStubSize();
327 // FIXME: this is an inefficient way to handle this. We should computed the
328 // necessary section allocation size in loadObject by walking all the sections
330 unsigned StubBufSize = 0;
331 for (section_iterator SI = Obj.begin_sections(), SE = Obj.end_sections();
333 section_iterator RelSecI = SI->getRelocatedSection();
334 if (!(RelSecI == Section))
337 for (const RelocationRef &Reloc : SI->relocations()) {
339 StubBufSize += StubSize;
343 // Get section data size and alignment
344 uint64_t Alignment64;
346 Check(Section.getSize(DataSize));
347 Check(Section.getAlignment(Alignment64));
349 // Add stubbuf size alignment
350 unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
351 unsigned StubAlignment = getStubAlignment();
352 unsigned EndAlignment = (DataSize | Alignment) & -(DataSize | Alignment);
353 if (StubAlignment > EndAlignment)
354 StubBufSize += StubAlignment - EndAlignment;
358 void RuntimeDyldImpl::emitCommonSymbols(ObjectImage &Obj,
359 const CommonSymbolMap &CommonSymbols,
361 SymbolTableMap &SymbolTable) {
362 // Allocate memory for the section
363 unsigned SectionID = Sections.size();
364 uint8_t *Addr = MemMgr->allocateDataSection(TotalSize, sizeof(void *),
365 SectionID, StringRef(), false);
367 report_fatal_error("Unable to allocate memory for common symbols!");
369 Sections.push_back(SectionEntry(StringRef(), Addr, TotalSize, 0));
370 memset(Addr, 0, TotalSize);
372 DEBUG(dbgs() << "emitCommonSection SectionID: " << SectionID << " new addr: "
373 << format("%p", Addr) << " DataSize: " << TotalSize << "\n");
375 // Assign the address of each symbol
376 for (CommonSymbolMap::const_iterator it = CommonSymbols.begin(),
377 itEnd = CommonSymbols.end(); it != itEnd; ++it) {
378 uint64_t Size = it->second.first;
379 uint64_t Align = it->second.second;
381 it->first.getName(Name);
383 // This symbol has an alignment requirement.
384 uint64_t AlignOffset = OffsetToAlignment((uint64_t)Addr, Align);
386 Offset += AlignOffset;
387 DEBUG(dbgs() << "Allocating common symbol " << Name << " address "
388 << format("%p\n", Addr));
390 Obj.updateSymbolAddress(it->first, (uint64_t)Addr);
391 SymbolTable[Name.data()] = SymbolLoc(SectionID, Offset);
397 unsigned RuntimeDyldImpl::emitSection(ObjectImage &Obj,
398 const SectionRef &Section, bool IsCode) {
401 uint64_t Alignment64;
402 Check(Section.getContents(data));
403 Check(Section.getAlignment(Alignment64));
405 unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
411 unsigned PaddingSize = 0;
412 unsigned StubBufSize = 0;
414 Check(Section.isRequiredForExecution(IsRequired));
415 Check(Section.isVirtual(IsVirtual));
416 Check(Section.isZeroInit(IsZeroInit));
417 Check(Section.isReadOnlyData(IsReadOnly));
418 Check(Section.getSize(DataSize));
419 Check(Section.getName(Name));
421 StubBufSize = computeSectionStubBufSize(Obj, Section);
423 // The .eh_frame section (at least on Linux) needs an extra four bytes padded
424 // with zeroes added at the end. For MachO objects, this section has a
425 // slightly different name, so this won't have any effect for MachO objects.
426 if (Name == ".eh_frame")
430 unsigned SectionID = Sections.size();
432 const char *pData = nullptr;
434 // Some sections, such as debug info, don't need to be loaded for execution.
435 // Leave those where they are.
437 Allocate = DataSize + PaddingSize + StubBufSize;
438 Addr = IsCode ? MemMgr->allocateCodeSection(Allocate, Alignment, SectionID,
440 : MemMgr->allocateDataSection(Allocate, Alignment, SectionID,
443 report_fatal_error("Unable to allocate section memory!");
445 // Virtual sections have no data in the object image, so leave pData = 0
449 // Zero-initialize or copy the data from the image
450 if (IsZeroInit || IsVirtual)
451 memset(Addr, 0, DataSize);
453 memcpy(Addr, pData, DataSize);
455 // Fill in any extra bytes we allocated for padding
456 if (PaddingSize != 0) {
457 memset(Addr + DataSize, 0, PaddingSize);
458 // Update the DataSize variable so that the stub offset is set correctly.
459 DataSize += PaddingSize;
462 DEBUG(dbgs() << "emitSection SectionID: " << SectionID << " Name: " << Name
463 << " obj addr: " << format("%p", pData)
464 << " new addr: " << format("%p", Addr)
465 << " DataSize: " << DataSize << " StubBufSize: " << StubBufSize
466 << " Allocate: " << Allocate << "\n");
467 Obj.updateSectionAddress(Section, (uint64_t)Addr);
469 // Even if we didn't load the section, we need to record an entry for it
470 // to handle later processing (and by 'handle' I mean don't do anything
471 // with these sections).
474 DEBUG(dbgs() << "emitSection SectionID: " << SectionID << " Name: " << Name
475 << " obj addr: " << format("%p", data.data()) << " new addr: 0"
476 << " DataSize: " << DataSize << " StubBufSize: " << StubBufSize
477 << " Allocate: " << Allocate << "\n");
480 Sections.push_back(SectionEntry(Name, Addr, DataSize, (uintptr_t)pData));
484 unsigned RuntimeDyldImpl::findOrEmitSection(ObjectImage &Obj,
485 const SectionRef &Section,
487 ObjSectionToIDMap &LocalSections) {
489 unsigned SectionID = 0;
490 ObjSectionToIDMap::iterator i = LocalSections.find(Section);
491 if (i != LocalSections.end())
492 SectionID = i->second;
494 SectionID = emitSection(Obj, Section, IsCode);
495 LocalSections[Section] = SectionID;
500 void RuntimeDyldImpl::addRelocationForSection(const RelocationEntry &RE,
501 unsigned SectionID) {
502 Relocations[SectionID].push_back(RE);
505 void RuntimeDyldImpl::addRelocationForSymbol(const RelocationEntry &RE,
506 StringRef SymbolName) {
507 // Relocation by symbol. If the symbol is found in the global symbol table,
508 // create an appropriate section relocation. Otherwise, add it to
509 // ExternalSymbolRelocations.
510 SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(SymbolName);
511 if (Loc == GlobalSymbolTable.end()) {
512 ExternalSymbolRelocations[SymbolName].push_back(RE);
514 // Copy the RE since we want to modify its addend.
515 RelocationEntry RECopy = RE;
516 RECopy.Addend += Loc->second.second;
517 Relocations[Loc->second.first].push_back(RECopy);
521 uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr) {
522 if (Arch == Triple::aarch64 || Arch == Triple::aarch64_be ||
523 Arch == Triple::arm64 || Arch == Triple::arm64_be) {
524 // This stub has to be able to access the full address space,
525 // since symbol lookup won't necessarily find a handy, in-range,
526 // PLT stub for functions which could be anywhere.
527 uint32_t *StubAddr = (uint32_t *)Addr;
529 // Stub can use ip0 (== x16) to calculate address
530 *StubAddr = 0xd2e00010; // movz ip0, #:abs_g3:<addr>
532 *StubAddr = 0xf2c00010; // movk ip0, #:abs_g2_nc:<addr>
534 *StubAddr = 0xf2a00010; // movk ip0, #:abs_g1_nc:<addr>
536 *StubAddr = 0xf2800010; // movk ip0, #:abs_g0_nc:<addr>
538 *StubAddr = 0xd61f0200; // br ip0
541 } else if (Arch == Triple::arm || Arch == Triple::armeb) {
542 // TODO: There is only ARM far stub now. We should add the Thumb stub,
543 // and stubs for branches Thumb - ARM and ARM - Thumb.
544 uint32_t *StubAddr = (uint32_t *)Addr;
545 *StubAddr = 0xe51ff004; // ldr pc,<label>
546 return (uint8_t *)++StubAddr;
547 } else if (Arch == Triple::mipsel || Arch == Triple::mips) {
548 uint32_t *StubAddr = (uint32_t *)Addr;
549 // 0: 3c190000 lui t9,%hi(addr).
550 // 4: 27390000 addiu t9,t9,%lo(addr).
551 // 8: 03200008 jr t9.
553 const unsigned LuiT9Instr = 0x3c190000, AdduiT9Instr = 0x27390000;
554 const unsigned JrT9Instr = 0x03200008, NopInstr = 0x0;
556 *StubAddr = LuiT9Instr;
558 *StubAddr = AdduiT9Instr;
560 *StubAddr = JrT9Instr;
562 *StubAddr = NopInstr;
564 } else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) {
565 // PowerPC64 stub: the address points to a function descriptor
566 // instead of the function itself. Load the function address
567 // on r11 and sets it to control register. Also loads the function
568 // TOC in r2 and environment pointer to r11.
569 writeInt32BE(Addr, 0x3D800000); // lis r12, highest(addr)
570 writeInt32BE(Addr+4, 0x618C0000); // ori r12, higher(addr)
571 writeInt32BE(Addr+8, 0x798C07C6); // sldi r12, r12, 32
572 writeInt32BE(Addr+12, 0x658C0000); // oris r12, r12, h(addr)
573 writeInt32BE(Addr+16, 0x618C0000); // ori r12, r12, l(addr)
574 writeInt32BE(Addr+20, 0xF8410028); // std r2, 40(r1)
575 writeInt32BE(Addr+24, 0xE96C0000); // ld r11, 0(r12)
576 writeInt32BE(Addr+28, 0xE84C0008); // ld r2, 0(r12)
577 writeInt32BE(Addr+32, 0x7D6903A6); // mtctr r11
578 writeInt32BE(Addr+36, 0xE96C0010); // ld r11, 16(r2)
579 writeInt32BE(Addr+40, 0x4E800420); // bctr
582 } else if (Arch == Triple::systemz) {
583 writeInt16BE(Addr, 0xC418); // lgrl %r1,.+8
584 writeInt16BE(Addr+2, 0x0000);
585 writeInt16BE(Addr+4, 0x0004);
586 writeInt16BE(Addr+6, 0x07F1); // brc 15,%r1
587 // 8-byte address stored at Addr + 8
589 } else if (Arch == Triple::x86_64) {
591 *(Addr+1) = 0x25; // rip
592 // 32-bit PC-relative address of the GOT entry will be stored at Addr+2
593 } else if (Arch == Triple::x86) {
594 *Addr = 0xE9; // 32-bit pc-relative jump.
599 // Assign an address to a symbol name and resolve all the relocations
600 // associated with it.
601 void RuntimeDyldImpl::reassignSectionAddress(unsigned SectionID,
603 // The address to use for relocation resolution is not
604 // the address of the local section buffer. We must be doing
605 // a remote execution environment of some sort. Relocations can't
606 // be applied until all the sections have been moved. The client must
607 // trigger this with a call to MCJIT::finalize() or
608 // RuntimeDyld::resolveRelocations().
610 // Addr is a uint64_t because we can't assume the pointer width
611 // of the target is the same as that of the host. Just use a generic
612 // "big enough" type.
613 Sections[SectionID].LoadAddress = Addr;
616 void RuntimeDyldImpl::resolveRelocationList(const RelocationList &Relocs,
618 for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
619 const RelocationEntry &RE = Relocs[i];
620 // Ignore relocations for sections that were not loaded
621 if (Sections[RE.SectionID].Address == nullptr)
623 resolveRelocation(RE, Value);
627 void RuntimeDyldImpl::resolveExternalSymbols() {
628 while (!ExternalSymbolRelocations.empty()) {
629 StringMap<RelocationList>::iterator i = ExternalSymbolRelocations.begin();
631 StringRef Name = i->first();
632 if (Name.size() == 0) {
633 // This is an absolute symbol, use an address of zero.
634 DEBUG(dbgs() << "Resolving absolute relocations."
636 RelocationList &Relocs = i->second;
637 resolveRelocationList(Relocs, 0);
640 SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(Name);
641 if (Loc == GlobalSymbolTable.end()) {
642 // This is an external symbol, try to get its address from
644 Addr = MemMgr->getSymbolAddress(Name.data());
645 // The call to getSymbolAddress may have caused additional modules to
646 // be loaded, which may have added new entries to the
647 // ExternalSymbolRelocations map. Consquently, we need to update our
648 // iterator. This is also why retrieval of the relocation list
649 // associated with this symbol is deferred until below this point.
650 // New entries may have been added to the relocation list.
651 i = ExternalSymbolRelocations.find(Name);
653 // We found the symbol in our global table. It was probably in a
654 // Module that we loaded previously.
655 SymbolLoc SymLoc = Loc->second;
656 Addr = getSectionLoadAddress(SymLoc.first) + SymLoc.second;
659 // FIXME: Implement error handling that doesn't kill the host program!
661 report_fatal_error("Program used external function '" + Name +
662 "' which could not be resolved!");
664 updateGOTEntries(Name, Addr);
665 DEBUG(dbgs() << "Resolving relocations Name: " << Name << "\t"
666 << format("0x%lx", Addr) << "\n");
667 // This list may have been updated when we called getSymbolAddress, so
668 // don't change this code to get the list earlier.
669 RelocationList &Relocs = i->second;
670 resolveRelocationList(Relocs, Addr);
673 ExternalSymbolRelocations.erase(i);
677 //===----------------------------------------------------------------------===//
678 // RuntimeDyld class implementation
679 RuntimeDyld::RuntimeDyld(RTDyldMemoryManager *mm) {
680 // FIXME: There's a potential issue lurking here if a single instance of
681 // RuntimeDyld is used to load multiple objects. The current implementation
682 // associates a single memory manager with a RuntimeDyld instance. Even
683 // though the public class spawns a new 'impl' instance for each load,
684 // they share a single memory manager. This can become a problem when page
685 // permissions are applied.
688 ProcessAllSections = false;
691 RuntimeDyld::~RuntimeDyld() { delete Dyld; }
693 static std::unique_ptr<RuntimeDyldELF>
694 createRuntimeDyldELF(RTDyldMemoryManager *MM, bool ProcessAllSections) {
695 std::unique_ptr<RuntimeDyldELF> Dyld(new RuntimeDyldELF(MM));
696 Dyld->setProcessAllSections(ProcessAllSections);
700 static std::unique_ptr<RuntimeDyldMachO>
701 createRuntimeDyldMachO(RTDyldMemoryManager *MM, bool ProcessAllSections) {
702 std::unique_ptr<RuntimeDyldMachO> Dyld(new RuntimeDyldMachO(MM));
703 Dyld->setProcessAllSections(ProcessAllSections);
707 ObjectImage *RuntimeDyld::loadObject(std::unique_ptr<ObjectFile> InputObject) {
708 std::unique_ptr<ObjectImage> InputImage;
710 ObjectFile &Obj = *InputObject;
712 if (InputObject->isELF()) {
713 InputImage.reset(RuntimeDyldELF::createObjectImageFromFile(std::move(InputObject)));
715 Dyld = createRuntimeDyldELF(MM, ProcessAllSections).release();
716 } else if (InputObject->isMachO()) {
717 InputImage.reset(RuntimeDyldMachO::createObjectImageFromFile(std::move(InputObject)));
719 Dyld = createRuntimeDyldMachO(MM, ProcessAllSections).release();
721 report_fatal_error("Incompatible object format!");
723 if (!Dyld->isCompatibleFile(&Obj))
724 report_fatal_error("Incompatible object format!");
726 Dyld->loadObject(InputImage.get());
727 return InputImage.release();
730 ObjectImage *RuntimeDyld::loadObject(ObjectBuffer *InputBuffer) {
731 std::unique_ptr<ObjectImage> InputImage;
732 sys::fs::file_magic Type = sys::fs::identify_magic(InputBuffer->getBuffer());
735 case sys::fs::file_magic::elf_relocatable:
736 case sys::fs::file_magic::elf_executable:
737 case sys::fs::file_magic::elf_shared_object:
738 case sys::fs::file_magic::elf_core:
739 InputImage.reset(RuntimeDyldELF::createObjectImage(InputBuffer));
741 Dyld = createRuntimeDyldELF(MM, ProcessAllSections).release();
743 case sys::fs::file_magic::macho_object:
744 case sys::fs::file_magic::macho_executable:
745 case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
746 case sys::fs::file_magic::macho_core:
747 case sys::fs::file_magic::macho_preload_executable:
748 case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
749 case sys::fs::file_magic::macho_dynamic_linker:
750 case sys::fs::file_magic::macho_bundle:
751 case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
752 case sys::fs::file_magic::macho_dsym_companion:
753 InputImage.reset(RuntimeDyldMachO::createObjectImage(InputBuffer));
755 Dyld = createRuntimeDyldMachO(MM, ProcessAllSections).release();
757 case sys::fs::file_magic::unknown:
758 case sys::fs::file_magic::bitcode:
759 case sys::fs::file_magic::archive:
760 case sys::fs::file_magic::coff_object:
761 case sys::fs::file_magic::coff_import_library:
762 case sys::fs::file_magic::pecoff_executable:
763 case sys::fs::file_magic::macho_universal_binary:
764 case sys::fs::file_magic::windows_resource:
765 report_fatal_error("Incompatible object format!");
768 if (!Dyld->isCompatibleFormat(InputBuffer))
769 report_fatal_error("Incompatible object format!");
771 Dyld->loadObject(InputImage.get());
772 return InputImage.release();
775 void *RuntimeDyld::getSymbolAddress(StringRef Name) {
778 return Dyld->getSymbolAddress(Name);
781 uint64_t RuntimeDyld::getSymbolLoadAddress(StringRef Name) {
784 return Dyld->getSymbolLoadAddress(Name);
787 void RuntimeDyld::resolveRelocations() { Dyld->resolveRelocations(); }
789 void RuntimeDyld::reassignSectionAddress(unsigned SectionID, uint64_t Addr) {
790 Dyld->reassignSectionAddress(SectionID, Addr);
793 void RuntimeDyld::mapSectionAddress(const void *LocalAddress,
794 uint64_t TargetAddress) {
795 Dyld->mapSectionAddress(LocalAddress, TargetAddress);
798 bool RuntimeDyld::hasError() { return Dyld->hasError(); }
800 StringRef RuntimeDyld::getErrorString() { return Dyld->getErrorString(); }
802 void RuntimeDyld::registerEHFrames() {
804 Dyld->registerEHFrames();
807 void RuntimeDyld::deregisterEHFrames() {
809 Dyld->deregisterEHFrames();
812 } // end namespace llvm