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() {
41 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
59 << "\t" << format("%p", (uint8_t *)Addr)
61 resolveRelocationList(Relocations[i], Addr);
66 void RuntimeDyldImpl::mapSectionAddress(const void *LocalAddress,
67 uint64_t TargetAddress) {
68 MutexGuard locked(lock);
69 for (unsigned i = 0, e = Sections.size(); i != e; ++i) {
70 if (Sections[i].Address == LocalAddress) {
71 reassignSectionAddress(i, TargetAddress);
75 llvm_unreachable("Attempting to remap address of unknown section!");
78 // Subclasses can implement this method to create specialized image instances.
79 // The caller owns the pointer that is returned.
80 ObjectImage *RuntimeDyldImpl::createObjectImage(ObjectBuffer *InputBuffer) {
81 return new ObjectImageCommon(InputBuffer);
84 ObjectImage *RuntimeDyldImpl::createObjectImageFromFile(ObjectFile *InputObject) {
85 return new ObjectImageCommon(InputObject);
88 ObjectImage *RuntimeDyldImpl::loadObject(ObjectFile *InputObject) {
89 return loadObject(createObjectImageFromFile(InputObject));
92 ObjectImage *RuntimeDyldImpl::loadObject(ObjectBuffer *InputBuffer) {
93 return loadObject(createObjectImage(InputBuffer));
96 ObjectImage *RuntimeDyldImpl::loadObject(ObjectImage *InputObject) {
97 MutexGuard locked(lock);
99 std::unique_ptr<ObjectImage> Obj(InputObject);
103 // Save information about our target
104 Arch = (Triple::ArchType)Obj->getArch();
105 IsTargetLittleEndian = Obj->getObjectFile()->isLittleEndian();
107 // Compute the memory size required to load all sections to be loaded
108 // and pass this information to the memory manager
109 if (MemMgr->needsToReserveAllocationSpace()) {
110 uint64_t CodeSize = 0, DataSizeRO = 0, DataSizeRW = 0;
111 computeTotalAllocSize(*Obj, CodeSize, DataSizeRO, DataSizeRW);
112 MemMgr->reserveAllocationSpace(CodeSize, DataSizeRO, DataSizeRW);
115 // Symbols found in this object
116 StringMap<SymbolLoc> LocalSymbols;
117 // Used sections from the object file
118 ObjSectionToIDMap LocalSections;
120 // Common symbols requiring allocation, with their sizes and alignments
121 CommonSymbolMap CommonSymbols;
122 // Maximum required total memory to allocate all common symbols
123 uint64_t CommonSize = 0;
126 DEBUG(dbgs() << "Parse symbols:\n");
127 for (symbol_iterator I = Obj->begin_symbols(), E = Obj->end_symbols(); I != E;
129 object::SymbolRef::Type SymType;
131 Check(I->getType(SymType));
132 Check(I->getName(Name));
134 uint32_t Flags = I->getFlags();
136 bool IsCommon = Flags & SymbolRef::SF_Common;
138 // Add the common symbols to a list. We'll allocate them all below.
140 Check(I->getAlignment(Align));
142 Check(I->getSize(Size));
143 CommonSize += Size + Align;
144 CommonSymbols[*I] = CommonSymbolInfo(Size, Align);
146 if (SymType == object::SymbolRef::ST_Function ||
147 SymType == object::SymbolRef::ST_Data ||
148 SymType == object::SymbolRef::ST_Unknown) {
150 StringRef SectionData;
152 section_iterator SI = Obj->end_sections();
153 Check(I->getFileOffset(FileOffset));
154 Check(I->getSection(SI));
155 if (SI == Obj->end_sections()) continue;
156 Check(SI->getContents(SectionData));
157 Check(SI->isText(IsCode));
158 const uint8_t* SymPtr = (const uint8_t*)InputObject->getData().data() +
159 (uintptr_t)FileOffset;
160 uintptr_t SectOffset = (uintptr_t)(SymPtr -
161 (const uint8_t*)SectionData.begin());
162 unsigned SectionID = findOrEmitSection(*Obj, *SI, IsCode, LocalSections);
163 LocalSymbols[Name.data()] = SymbolLoc(SectionID, SectOffset);
164 DEBUG(dbgs() << "\tFileOffset: " << format("%p", (uintptr_t)FileOffset)
165 << " flags: " << Flags
166 << " SID: " << SectionID
167 << " Offset: " << format("%p", SectOffset));
168 GlobalSymbolTable[Name] = SymbolLoc(SectionID, SectOffset);
171 DEBUG(dbgs() << "\tType: " << SymType << " Name: " << Name << "\n");
174 // Allocate common symbols
176 emitCommonSymbols(*Obj, CommonSymbols, CommonSize, LocalSymbols);
178 // Parse and process relocations
179 DEBUG(dbgs() << "Parse relocations:\n");
180 for (section_iterator SI = Obj->begin_sections(), SE = Obj->end_sections();
182 bool IsFirstRelocation = true;
183 unsigned SectionID = 0;
185 section_iterator RelocatedSection = SI->getRelocatedSection();
187 for (relocation_iterator I = SI->relocation_begin(),
188 E = SI->relocation_end();
190 // If it's the first relocation in this section, find its SectionID
191 if (IsFirstRelocation) {
193 Check(RelocatedSection->isText(IsCode));
195 findOrEmitSection(*Obj, *RelocatedSection, IsCode, LocalSections);
196 DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n");
197 IsFirstRelocation = false;
200 processRelocationRef(SectionID, *I, *Obj, LocalSections, LocalSymbols,
205 // Give the subclasses a chance to tie-up any loose ends.
206 finalizeLoad(LocalSections);
208 return Obj.release();
211 // A helper method for computeTotalAllocSize.
212 // Computes the memory size required to allocate sections with the given sizes,
213 // assuming that all sections are allocated with the given alignment
214 static uint64_t computeAllocationSizeForSections(std::vector<uint64_t>& SectionSizes,
215 uint64_t Alignment) {
216 uint64_t TotalSize = 0;
217 for (size_t Idx = 0, Cnt = SectionSizes.size(); Idx < Cnt; Idx++) {
218 uint64_t AlignedSize = (SectionSizes[Idx] + Alignment - 1) /
219 Alignment * Alignment;
220 TotalSize += AlignedSize;
225 // Compute an upper bound of the memory size that is required to load all sections
226 void RuntimeDyldImpl::computeTotalAllocSize(ObjectImage &Obj,
227 uint64_t& CodeSize, uint64_t& DataSizeRO, uint64_t& DataSizeRW) {
228 // Compute the size of all sections required for execution
229 std::vector<uint64_t> CodeSectionSizes;
230 std::vector<uint64_t> ROSectionSizes;
231 std::vector<uint64_t> RWSectionSizes;
232 uint64_t MaxAlignment = sizeof(void*);
234 // Collect sizes of all sections to be loaded;
235 // also determine the max alignment of all sections
236 for (section_iterator SI = Obj.begin_sections(), SE = Obj.end_sections();
238 const SectionRef &Section = *SI;
241 Check(Section.isRequiredForExecution(IsRequired));
243 // Consider only the sections that are required to be loaded for execution
245 uint64_t DataSize = 0;
246 uint64_t Alignment64 = 0;
248 bool IsReadOnly = false;
250 Check(Section.getSize(DataSize));
251 Check(Section.getAlignment(Alignment64));
252 Check(Section.isText(IsCode));
253 Check(Section.isReadOnlyData(IsReadOnly));
254 Check(Section.getName(Name));
255 unsigned Alignment = (unsigned) Alignment64 & 0xffffffffL;
257 uint64_t StubBufSize = computeSectionStubBufSize(Obj, Section);
258 uint64_t SectionSize = DataSize + StubBufSize;
260 // The .eh_frame section (at least on Linux) needs an extra four bytes padded
261 // with zeroes added at the end. For MachO objects, this section has a
262 // slightly different name, so this won't have any effect for MachO objects.
263 if (Name == ".eh_frame")
266 if (SectionSize > 0) {
267 // save the total size of the section
269 CodeSectionSizes.push_back(SectionSize);
270 } else if (IsReadOnly) {
271 ROSectionSizes.push_back(SectionSize);
273 RWSectionSizes.push_back(SectionSize);
275 // update the max alignment
276 if (Alignment > MaxAlignment) {
277 MaxAlignment = Alignment;
283 // Compute the size of all common symbols
284 uint64_t CommonSize = 0;
285 for (symbol_iterator I = Obj.begin_symbols(), E = Obj.end_symbols();
287 uint32_t Flags = I->getFlags();
288 if (Flags & SymbolRef::SF_Common) {
289 // Add the common symbols to a list. We'll allocate them all below.
291 Check(I->getSize(Size));
295 if (CommonSize != 0) {
296 RWSectionSizes.push_back(CommonSize);
299 // Compute the required allocation space for each different type of sections
300 // (code, read-only data, read-write data) assuming that all sections are
301 // allocated with the max alignment. Note that we cannot compute with the
302 // individual alignments of the sections, because then the required size
303 // depends on the order, in which the sections are allocated.
304 CodeSize = computeAllocationSizeForSections(CodeSectionSizes, MaxAlignment);
305 DataSizeRO = computeAllocationSizeForSections(ROSectionSizes, MaxAlignment);
306 DataSizeRW = computeAllocationSizeForSections(RWSectionSizes, MaxAlignment);
309 // compute stub buffer size for the given section
310 unsigned RuntimeDyldImpl::computeSectionStubBufSize(ObjectImage &Obj,
311 const SectionRef &Section) {
312 unsigned StubSize = getMaxStubSize();
316 // FIXME: this is an inefficient way to handle this. We should computed the
317 // necessary section allocation size in loadObject by walking all the sections
319 unsigned StubBufSize = 0;
320 for (section_iterator SI = Obj.begin_sections(),
321 SE = Obj.end_sections();
323 section_iterator RelSecI = SI->getRelocatedSection();
324 if (!(RelSecI == Section))
327 for (relocation_iterator I = SI->relocation_begin(),
328 E = SI->relocation_end();
330 StubBufSize += StubSize;
334 // Get section data size and alignment
335 uint64_t Alignment64;
337 Check(Section.getSize(DataSize));
338 Check(Section.getAlignment(Alignment64));
340 // Add stubbuf size alignment
341 unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
342 unsigned StubAlignment = getStubAlignment();
343 unsigned EndAlignment = (DataSize | Alignment) & -(DataSize | Alignment);
344 if (StubAlignment > EndAlignment)
345 StubBufSize += StubAlignment - EndAlignment;
349 void RuntimeDyldImpl::emitCommonSymbols(ObjectImage &Obj,
350 const CommonSymbolMap &CommonSymbols,
352 SymbolTableMap &SymbolTable) {
353 // Allocate memory for the section
354 unsigned SectionID = Sections.size();
355 uint8_t *Addr = MemMgr->allocateDataSection(
356 TotalSize, sizeof(void*), SectionID, StringRef(), false);
358 report_fatal_error("Unable to allocate memory for common symbols!");
360 Sections.push_back(SectionEntry(StringRef(), Addr, TotalSize, 0));
361 memset(Addr, 0, TotalSize);
363 DEBUG(dbgs() << "emitCommonSection SectionID: " << SectionID
364 << " new addr: " << format("%p", Addr)
365 << " DataSize: " << TotalSize
368 // Assign the address of each symbol
369 for (CommonSymbolMap::const_iterator it = CommonSymbols.begin(),
370 itEnd = CommonSymbols.end(); it != itEnd; it++) {
371 uint64_t Size = it->second.first;
372 uint64_t Align = it->second.second;
374 it->first.getName(Name);
376 // This symbol has an alignment requirement.
377 uint64_t AlignOffset = OffsetToAlignment((uint64_t)Addr, Align);
379 Offset += AlignOffset;
380 DEBUG(dbgs() << "Allocating common symbol " << Name << " address " <<
381 format("%p\n", Addr));
383 Obj.updateSymbolAddress(it->first, (uint64_t)Addr);
384 SymbolTable[Name.data()] = SymbolLoc(SectionID, Offset);
390 unsigned RuntimeDyldImpl::emitSection(ObjectImage &Obj,
391 const SectionRef &Section,
395 uint64_t Alignment64;
396 Check(Section.getContents(data));
397 Check(Section.getAlignment(Alignment64));
399 unsigned Alignment = (unsigned)Alignment64 & 0xffffffffL;
405 unsigned PaddingSize = 0;
406 unsigned StubBufSize = 0;
408 Check(Section.isRequiredForExecution(IsRequired));
409 Check(Section.isVirtual(IsVirtual));
410 Check(Section.isZeroInit(IsZeroInit));
411 Check(Section.isReadOnlyData(IsReadOnly));
412 Check(Section.getSize(DataSize));
413 Check(Section.getName(Name));
415 StubBufSize = computeSectionStubBufSize(Obj, Section);
417 // The .eh_frame section (at least on Linux) needs an extra four bytes padded
418 // with zeroes added at the end. For MachO objects, this section has a
419 // slightly different name, so this won't have any effect for MachO objects.
420 if (Name == ".eh_frame")
424 unsigned SectionID = Sections.size();
426 const char *pData = 0;
428 // Some sections, such as debug info, don't need to be loaded for execution.
429 // Leave those where they are.
431 Allocate = DataSize + PaddingSize + StubBufSize;
433 ? MemMgr->allocateCodeSection(Allocate, Alignment, SectionID, Name)
434 : MemMgr->allocateDataSection(Allocate, Alignment, SectionID, Name,
437 report_fatal_error("Unable to allocate section memory!");
439 // Virtual sections have no data in the object image, so leave pData = 0
443 // Zero-initialize or copy the data from the image
444 if (IsZeroInit || IsVirtual)
445 memset(Addr, 0, DataSize);
447 memcpy(Addr, pData, DataSize);
449 // Fill in any extra bytes we allocated for padding
450 if (PaddingSize != 0) {
451 memset(Addr + DataSize, 0, PaddingSize);
452 // Update the DataSize variable so that the stub offset is set correctly.
453 DataSize += PaddingSize;
456 DEBUG(dbgs() << "emitSection SectionID: " << SectionID
458 << " obj addr: " << format("%p", pData)
459 << " new addr: " << format("%p", Addr)
460 << " DataSize: " << DataSize
461 << " StubBufSize: " << StubBufSize
462 << " Allocate: " << Allocate
464 Obj.updateSectionAddress(Section, (uint64_t)Addr);
467 // Even if we didn't load the section, we need to record an entry for it
468 // to handle later processing (and by 'handle' I mean don't do anything
469 // with these sections).
472 DEBUG(dbgs() << "emitSection SectionID: " << SectionID
474 << " obj addr: " << format("%p", data.data())
476 << " DataSize: " << DataSize
477 << " StubBufSize: " << StubBufSize
478 << " Allocate: " << Allocate
482 Sections.push_back(SectionEntry(Name, Addr, DataSize, (uintptr_t)pData));
486 unsigned RuntimeDyldImpl::findOrEmitSection(ObjectImage &Obj,
487 const SectionRef &Section,
489 ObjSectionToIDMap &LocalSections) {
491 unsigned SectionID = 0;
492 ObjSectionToIDMap::iterator i = LocalSections.find(Section);
493 if (i != LocalSections.end())
494 SectionID = i->second;
496 SectionID = emitSection(Obj, Section, IsCode);
497 LocalSections[Section] = SectionID;
502 void RuntimeDyldImpl::addRelocationForSection(const RelocationEntry &RE,
503 unsigned SectionID) {
504 Relocations[SectionID].push_back(RE);
507 void RuntimeDyldImpl::addRelocationForSymbol(const RelocationEntry &RE,
508 StringRef SymbolName) {
509 // Relocation by symbol. If the symbol is found in the global symbol table,
510 // create an appropriate section relocation. Otherwise, add it to
511 // ExternalSymbolRelocations.
512 SymbolTableMap::const_iterator Loc =
513 GlobalSymbolTable.find(SymbolName);
514 if (Loc == GlobalSymbolTable.end()) {
515 ExternalSymbolRelocations[SymbolName].push_back(RE);
517 // Copy the RE since we want to modify its addend.
518 RelocationEntry RECopy = RE;
519 RECopy.Addend += Loc->second.second;
520 Relocations[Loc->second.first].push_back(RECopy);
524 uint8_t *RuntimeDyldImpl::createStubFunction(uint8_t *Addr) {
525 if (Arch == Triple::aarch64) {
526 // This stub has to be able to access the full address space,
527 // since symbol lookup won't necessarily find a handy, in-range,
528 // PLT stub for functions which could be anywhere.
529 uint32_t *StubAddr = (uint32_t*)Addr;
531 // Stub can use ip0 (== x16) to calculate address
532 *StubAddr = 0xd2e00010; // movz ip0, #:abs_g3:<addr>
534 *StubAddr = 0xf2c00010; // movk ip0, #:abs_g2_nc:<addr>
536 *StubAddr = 0xf2a00010; // movk ip0, #:abs_g1_nc:<addr>
538 *StubAddr = 0xf2800010; // movk ip0, #:abs_g0_nc:<addr>
540 *StubAddr = 0xd61f0200; // br ip0
543 } else if (Arch == Triple::arm) {
544 // TODO: There is only ARM far stub now. We should add the Thumb stub,
545 // and stubs for branches Thumb - ARM and ARM - Thumb.
546 uint32_t *StubAddr = (uint32_t*)Addr;
547 *StubAddr = 0xe51ff004; // ldr pc,<label>
548 return (uint8_t*)++StubAddr;
549 } else if (Arch == Triple::mipsel || Arch == Triple::mips) {
550 uint32_t *StubAddr = (uint32_t*)Addr;
551 // 0: 3c190000 lui t9,%hi(addr).
552 // 4: 27390000 addiu t9,t9,%lo(addr).
553 // 8: 03200008 jr t9.
555 const unsigned LuiT9Instr = 0x3c190000, AdduiT9Instr = 0x27390000;
556 const unsigned JrT9Instr = 0x03200008, NopInstr = 0x0;
558 *StubAddr = LuiT9Instr;
560 *StubAddr = AdduiT9Instr;
562 *StubAddr = JrT9Instr;
564 *StubAddr = NopInstr;
566 } else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le) {
567 // PowerPC64 stub: the address points to a function descriptor
568 // instead of the function itself. Load the function address
569 // on r11 and sets it to control register. Also loads the function
570 // TOC in r2 and environment pointer to r11.
571 writeInt32BE(Addr, 0x3D800000); // lis r12, highest(addr)
572 writeInt32BE(Addr+4, 0x618C0000); // ori r12, higher(addr)
573 writeInt32BE(Addr+8, 0x798C07C6); // sldi r12, r12, 32
574 writeInt32BE(Addr+12, 0x658C0000); // oris r12, r12, h(addr)
575 writeInt32BE(Addr+16, 0x618C0000); // ori r12, r12, l(addr)
576 writeInt32BE(Addr+20, 0xF8410028); // std r2, 40(r1)
577 writeInt32BE(Addr+24, 0xE96C0000); // ld r11, 0(r12)
578 writeInt32BE(Addr+28, 0xE84C0008); // ld r2, 0(r12)
579 writeInt32BE(Addr+32, 0x7D6903A6); // mtctr r11
580 writeInt32BE(Addr+36, 0xE96C0010); // ld r11, 16(r2)
581 writeInt32BE(Addr+40, 0x4E800420); // bctr
584 } else if (Arch == Triple::systemz) {
585 writeInt16BE(Addr, 0xC418); // lgrl %r1,.+8
586 writeInt16BE(Addr+2, 0x0000);
587 writeInt16BE(Addr+4, 0x0004);
588 writeInt16BE(Addr+6, 0x07F1); // brc 15,%r1
589 // 8-byte address stored at Addr + 8
591 } else if (Arch == Triple::x86_64) {
593 *(Addr+1) = 0x25; // rip
594 // 32-bit PC-relative address of the GOT entry will be stored at Addr+2
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 == 0)
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." << "\n");
635 RelocationList &Relocs = i->second;
636 resolveRelocationList(Relocs, 0);
639 SymbolTableMap::const_iterator Loc = GlobalSymbolTable.find(Name);
640 if (Loc == GlobalSymbolTable.end()) {
641 // This is an external symbol, try to get its address from
643 Addr = MemMgr->getSymbolAddress(Name.data());
644 // The call to getSymbolAddress may have caused additional modules to
645 // be loaded, which may have added new entries to the
646 // ExternalSymbolRelocations map. Consquently, we need to update our
647 // iterator. This is also why retrieval of the relocation list
648 // associated with this symbol is deferred until below this point.
649 // New entries may have been added to the relocation list.
650 i = ExternalSymbolRelocations.find(Name);
652 // We found the symbol in our global table. It was probably in a
653 // Module that we loaded previously.
654 SymbolLoc SymLoc = Loc->second;
655 Addr = getSectionLoadAddress(SymLoc.first) + SymLoc.second;
658 // FIXME: Implement error handling that doesn't kill the host program!
660 report_fatal_error("Program used external function '" + Name +
661 "' which could not be resolved!");
663 updateGOTEntries(Name, Addr);
664 DEBUG(dbgs() << "Resolving relocations Name: " << Name
665 << "\t" << format("0x%lx", Addr)
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);
678 //===----------------------------------------------------------------------===//
679 // RuntimeDyld class implementation
680 RuntimeDyld::RuntimeDyld(RTDyldMemoryManager *mm) {
681 // FIXME: There's a potential issue lurking here if a single instance of
682 // RuntimeDyld is used to load multiple objects. The current implementation
683 // associates a single memory manager with a RuntimeDyld instance. Even
684 // though the public class spawns a new 'impl' instance for each load,
685 // they share a single memory manager. This can become a problem when page
686 // permissions are applied.
691 RuntimeDyld::~RuntimeDyld() {
695 ObjectImage *RuntimeDyld::loadObject(ObjectFile *InputObject) {
697 if (InputObject->isELF())
698 Dyld = new RuntimeDyldELF(MM);
699 else if (InputObject->isMachO())
700 Dyld = new RuntimeDyldMachO(MM);
702 report_fatal_error("Incompatible object format!");
704 if (!Dyld->isCompatibleFile(InputObject))
705 report_fatal_error("Incompatible object format!");
708 return Dyld->loadObject(InputObject);
711 ObjectImage *RuntimeDyld::loadObject(ObjectBuffer *InputBuffer) {
713 sys::fs::file_magic Type =
714 sys::fs::identify_magic(InputBuffer->getBuffer());
716 case sys::fs::file_magic::elf_relocatable:
717 case sys::fs::file_magic::elf_executable:
718 case sys::fs::file_magic::elf_shared_object:
719 case sys::fs::file_magic::elf_core:
720 Dyld = new RuntimeDyldELF(MM);
722 case sys::fs::file_magic::macho_object:
723 case sys::fs::file_magic::macho_executable:
724 case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
725 case sys::fs::file_magic::macho_core:
726 case sys::fs::file_magic::macho_preload_executable:
727 case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
728 case sys::fs::file_magic::macho_dynamic_linker:
729 case sys::fs::file_magic::macho_bundle:
730 case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
731 case sys::fs::file_magic::macho_dsym_companion:
732 Dyld = new RuntimeDyldMachO(MM);
734 case sys::fs::file_magic::unknown:
735 case sys::fs::file_magic::bitcode:
736 case sys::fs::file_magic::archive:
737 case sys::fs::file_magic::coff_object:
738 case sys::fs::file_magic::coff_import_library:
739 case sys::fs::file_magic::pecoff_executable:
740 case sys::fs::file_magic::macho_universal_binary:
741 case sys::fs::file_magic::windows_resource:
742 report_fatal_error("Incompatible object format!");
745 if (!Dyld->isCompatibleFormat(InputBuffer))
746 report_fatal_error("Incompatible object format!");
749 return Dyld->loadObject(InputBuffer);
752 void *RuntimeDyld::getSymbolAddress(StringRef Name) {
755 return Dyld->getSymbolAddress(Name);
758 uint64_t RuntimeDyld::getSymbolLoadAddress(StringRef Name) {
761 return Dyld->getSymbolLoadAddress(Name);
764 void RuntimeDyld::resolveRelocations() {
765 Dyld->resolveRelocations();
768 void RuntimeDyld::reassignSectionAddress(unsigned SectionID,
770 Dyld->reassignSectionAddress(SectionID, Addr);
773 void RuntimeDyld::mapSectionAddress(const void *LocalAddress,
774 uint64_t TargetAddress) {
775 Dyld->mapSectionAddress(LocalAddress, TargetAddress);
778 StringRef RuntimeDyld::getErrorString() {
779 return Dyld->getErrorString();
782 void RuntimeDyld::registerEHFrames() {
784 Dyld->registerEHFrames();
787 void RuntimeDyld::deregisterEHFrames() {
789 Dyld->deregisterEHFrames();
792 } // end namespace llvm