llvm-rtdyld.cpp revision 309124 
1//===-- llvm-rtdyld.cpp - MCJIT Testing Tool ------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This is a testing tool for use with the MC-JIT LLVM components.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/ADT/StringMap.h"
15#include "llvm/DebugInfo/DIContext.h"
16#include "llvm/DebugInfo/DWARF/DWARFContext.h"
17#include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
18#include "llvm/ExecutionEngine/RuntimeDyld.h"
19#include "llvm/ExecutionEngine/RuntimeDyldChecker.h"
20#include "llvm/MC/MCAsmInfo.h"
21#include "llvm/MC/MCContext.h"
22#include "llvm/MC/MCDisassembler/MCDisassembler.h"
23#include "llvm/MC/MCInstPrinter.h"
24#include "llvm/MC/MCInstrInfo.h"
25#include "llvm/MC/MCRegisterInfo.h"
26#include "llvm/MC/MCSubtargetInfo.h"
27#include "llvm/Object/MachO.h"
28#include "llvm/Object/SymbolSize.h"
29#include "llvm/Support/CommandLine.h"
30#include "llvm/Support/DynamicLibrary.h"
31#include "llvm/Support/ManagedStatic.h"
32#include "llvm/Support/Memory.h"
33#include "llvm/Support/MemoryBuffer.h"
34#include "llvm/Support/PrettyStackTrace.h"
35#include "llvm/Support/Signals.h"
36#include "llvm/Support/TargetRegistry.h"
37#include "llvm/Support/TargetSelect.h"
38#include "llvm/Support/raw_ostream.h"
39#include <list>
40#include <system_error>
41
42using namespace llvm;
43using namespace llvm::object;
44
45static cl::list<std::string>
46InputFileList(cl::Positional, cl::ZeroOrMore,
47              cl::desc("<input file>"));
48
49enum ActionType {
50  AC_Execute,
51  AC_PrintObjectLineInfo,
52  AC_PrintLineInfo,
53  AC_PrintDebugLineInfo,
54  AC_Verify
55};
56
57static cl::opt<ActionType>
58Action(cl::desc("Action to perform:"),
59       cl::init(AC_Execute),
60       cl::values(clEnumValN(AC_Execute, "execute",
61                             "Load, link, and execute the inputs."),
62                  clEnumValN(AC_PrintLineInfo, "printline",
63                             "Load, link, and print line information for each function."),
64                  clEnumValN(AC_PrintDebugLineInfo, "printdebugline",
65                             "Load, link, and print line information for each function using the debug object"),
66                  clEnumValN(AC_PrintObjectLineInfo, "printobjline",
67                             "Like -printlineinfo but does not load the object first"),
68                  clEnumValN(AC_Verify, "verify",
69                             "Load, link and verify the resulting memory image."),
70                  clEnumValEnd));
71
72static cl::opt<std::string>
73EntryPoint("entry",
74           cl::desc("Function to call as entry point."),
75           cl::init("_main"));
76
77static cl::list<std::string>
78Dylibs("dylib",
79       cl::desc("Add library."),
80       cl::ZeroOrMore);
81
82static cl::opt<std::string>
83TripleName("triple", cl::desc("Target triple for disassembler"));
84
85static cl::opt<std::string>
86MCPU("mcpu",
87     cl::desc("Target a specific cpu type (-mcpu=help for details)"),
88     cl::value_desc("cpu-name"),
89     cl::init(""));
90
91static cl::list<std::string>
92CheckFiles("check",
93           cl::desc("File containing RuntimeDyld verifier checks."),
94           cl::ZeroOrMore);
95
96static cl::opt<uint64_t>
97PreallocMemory("preallocate",
98              cl::desc("Allocate memory upfront rather than on-demand"),
99              cl::init(0));
100
101static cl::opt<uint64_t>
102TargetAddrStart("target-addr-start",
103                cl::desc("For -verify only: start of phony target address "
104                         "range."),
105                cl::init(4096), // Start at "page 1" - no allocating at "null".
106                cl::Hidden);
107
108static cl::opt<uint64_t>
109TargetAddrEnd("target-addr-end",
110              cl::desc("For -verify only: end of phony target address range."),
111              cl::init(~0ULL),
112              cl::Hidden);
113
114static cl::opt<uint64_t>
115TargetSectionSep("target-section-sep",
116                 cl::desc("For -verify only: Separation between sections in "
117                          "phony target address space."),
118                 cl::init(0),
119                 cl::Hidden);
120
121static cl::list<std::string>
122SpecificSectionMappings("map-section",
123                        cl::desc("For -verify only: Map a section to a "
124                                 "specific address."),
125                        cl::ZeroOrMore,
126                        cl::Hidden);
127
128static cl::list<std::string>
129DummySymbolMappings("dummy-extern",
130                    cl::desc("For -verify only: Inject a symbol into the extern "
131                             "symbol table."),
132                    cl::ZeroOrMore,
133                    cl::Hidden);
134
135static cl::opt<bool>
136PrintAllocationRequests("print-alloc-requests",
137                        cl::desc("Print allocation requests made to the memory "
138                                 "manager by RuntimeDyld"),
139                        cl::Hidden);
140
141/* *** */
142
143// A trivial memory manager that doesn't do anything fancy, just uses the
144// support library allocation routines directly.
145class TrivialMemoryManager : public RTDyldMemoryManager {
146public:
147  SmallVector<sys::MemoryBlock, 16> FunctionMemory;
148  SmallVector<sys::MemoryBlock, 16> DataMemory;
149
150  uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment,
151                               unsigned SectionID,
152                               StringRef SectionName) override;
153  uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment,
154                               unsigned SectionID, StringRef SectionName,
155                               bool IsReadOnly) override;
156
157  void *getPointerToNamedFunction(const std::string &Name,
158                                  bool AbortOnFailure = true) override {
159    return nullptr;
160  }
161
162  bool finalizeMemory(std::string *ErrMsg) override { return false; }
163
164  void addDummySymbol(const std::string &Name, uint64_t Addr) {
165    DummyExterns[Name] = Addr;
166  }
167
168  RuntimeDyld::SymbolInfo findSymbol(const std::string &Name) override {
169    auto I = DummyExterns.find(Name);
170
171    if (I != DummyExterns.end())
172      return RuntimeDyld::SymbolInfo(I->second, JITSymbolFlags::Exported);
173
174    return RTDyldMemoryManager::findSymbol(Name);
175  }
176
177  void registerEHFrames(uint8_t *Addr, uint64_t LoadAddr,
178                        size_t Size) override {}
179  void deregisterEHFrames(uint8_t *Addr, uint64_t LoadAddr,
180                          size_t Size) override {}
181
182  void preallocateSlab(uint64_t Size) {
183    std::string Err;
184    sys::MemoryBlock MB = sys::Memory::AllocateRWX(Size, nullptr, &Err);
185    if (!MB.base())
186      report_fatal_error("Can't allocate enough memory: " + Err);
187
188    PreallocSlab = MB;
189    UsePreallocation = true;
190    SlabSize = Size;
191  }
192
193  uint8_t *allocateFromSlab(uintptr_t Size, unsigned Alignment, bool isCode) {
194    Size = alignTo(Size, Alignment);
195    if (CurrentSlabOffset + Size > SlabSize)
196      report_fatal_error("Can't allocate enough memory. Tune --preallocate");
197
198    uintptr_t OldSlabOffset = CurrentSlabOffset;
199    sys::MemoryBlock MB((void *)OldSlabOffset, Size);
200    if (isCode)
201      FunctionMemory.push_back(MB);
202    else
203      DataMemory.push_back(MB);
204    CurrentSlabOffset += Size;
205    return (uint8_t*)OldSlabOffset;
206  }
207
208private:
209  std::map<std::string, uint64_t> DummyExterns;
210  sys::MemoryBlock PreallocSlab;
211  bool UsePreallocation = false;
212  uintptr_t SlabSize = 0;
213  uintptr_t CurrentSlabOffset = 0;
214};
215
216uint8_t *TrivialMemoryManager::allocateCodeSection(uintptr_t Size,
217                                                   unsigned Alignment,
218                                                   unsigned SectionID,
219                                                   StringRef SectionName) {
220  if (PrintAllocationRequests)
221    outs() << "allocateCodeSection(Size = " << Size << ", Alignment = "
222           << Alignment << ", SectionName = " << SectionName << ")\n";
223
224  if (UsePreallocation)
225    return allocateFromSlab(Size, Alignment, true /* isCode */);
226
227  std::string Err;
228  sys::MemoryBlock MB = sys::Memory::AllocateRWX(Size, nullptr, &Err);
229  if (!MB.base())
230    report_fatal_error("MemoryManager allocation failed: " + Err);
231  FunctionMemory.push_back(MB);
232  return (uint8_t*)MB.base();
233}
234
235uint8_t *TrivialMemoryManager::allocateDataSection(uintptr_t Size,
236                                                   unsigned Alignment,
237                                                   unsigned SectionID,
238                                                   StringRef SectionName,
239                                                   bool IsReadOnly) {
240  if (PrintAllocationRequests)
241    outs() << "allocateDataSection(Size = " << Size << ", Alignment = "
242           << Alignment << ", SectionName = " << SectionName << ")\n";
243
244  if (UsePreallocation)
245    return allocateFromSlab(Size, Alignment, false /* isCode */);
246
247  std::string Err;
248  sys::MemoryBlock MB = sys::Memory::AllocateRWX(Size, nullptr, &Err);
249  if (!MB.base())
250    report_fatal_error("MemoryManager allocation failed: " + Err);
251  DataMemory.push_back(MB);
252  return (uint8_t*)MB.base();
253}
254
255static const char *ProgramName;
256
257static void ErrorAndExit(const Twine &Msg) {
258  errs() << ProgramName << ": error: " << Msg << "\n";
259  exit(1);
260}
261
262static void loadDylibs() {
263  for (const std::string &Dylib : Dylibs) {
264    if (!sys::fs::is_regular_file(Dylib))
265      report_fatal_error("Dylib not found: '" + Dylib + "'.");
266    std::string ErrMsg;
267    if (sys::DynamicLibrary::LoadLibraryPermanently(Dylib.c_str(), &ErrMsg))
268      report_fatal_error("Error loading '" + Dylib + "': " + ErrMsg);
269  }
270}
271
272/* *** */
273
274static int printLineInfoForInput(bool LoadObjects, bool UseDebugObj) {
275  assert(LoadObjects || !UseDebugObj);
276
277  // Load any dylibs requested on the command line.
278  loadDylibs();
279
280  // If we don't have any input files, read from stdin.
281  if (!InputFileList.size())
282    InputFileList.push_back("-");
283  for (auto &File : InputFileList) {
284    // Instantiate a dynamic linker.
285    TrivialMemoryManager MemMgr;
286    RuntimeDyld Dyld(MemMgr, MemMgr);
287
288    // Load the input memory buffer.
289
290    ErrorOr<std::unique_ptr<MemoryBuffer>> InputBuffer =
291        MemoryBuffer::getFileOrSTDIN(File);
292    if (std::error_code EC = InputBuffer.getError())
293      ErrorAndExit("unable to read input: '" + EC.message() + "'");
294
295    Expected<std::unique_ptr<ObjectFile>> MaybeObj(
296      ObjectFile::createObjectFile((*InputBuffer)->getMemBufferRef()));
297
298    if (!MaybeObj) {
299      std::string Buf;
300      raw_string_ostream OS(Buf);
301      logAllUnhandledErrors(MaybeObj.takeError(), OS, "");
302      OS.flush();
303      ErrorAndExit("unable to create object file: '" + Buf + "'");
304    }
305
306    ObjectFile &Obj = **MaybeObj;
307
308    OwningBinary<ObjectFile> DebugObj;
309    std::unique_ptr<RuntimeDyld::LoadedObjectInfo> LoadedObjInfo = nullptr;
310    ObjectFile *SymbolObj = &Obj;
311    if (LoadObjects) {
312      // Load the object file
313      LoadedObjInfo =
314        Dyld.loadObject(Obj);
315
316      if (Dyld.hasError())
317        ErrorAndExit(Dyld.getErrorString());
318
319      // Resolve all the relocations we can.
320      Dyld.resolveRelocations();
321
322      if (UseDebugObj) {
323        DebugObj = LoadedObjInfo->getObjectForDebug(Obj);
324        SymbolObj = DebugObj.getBinary();
325        LoadedObjInfo.reset();
326      }
327    }
328
329    std::unique_ptr<DIContext> Context(
330      new DWARFContextInMemory(*SymbolObj,LoadedObjInfo.get()));
331
332    std::vector<std::pair<SymbolRef, uint64_t>> SymAddr =
333        object::computeSymbolSizes(*SymbolObj);
334
335    // Use symbol info to iterate functions in the object.
336    for (const auto &P : SymAddr) {
337      object::SymbolRef Sym = P.first;
338      Expected<SymbolRef::Type> TypeOrErr = Sym.getType();
339      if (!TypeOrErr) {
340        // TODO: Actually report errors helpfully.
341        consumeError(TypeOrErr.takeError());
342        continue;
343      }
344      SymbolRef::Type Type = *TypeOrErr;
345      if (Type == object::SymbolRef::ST_Function) {
346        Expected<StringRef> Name = Sym.getName();
347        if (!Name) {
348          // TODO: Actually report errors helpfully.
349          consumeError(Name.takeError());
350          continue;
351        }
352        Expected<uint64_t> AddrOrErr = Sym.getAddress();
353        if (!AddrOrErr) {
354          // TODO: Actually report errors helpfully.
355          consumeError(AddrOrErr.takeError());
356          continue;
357        }
358        uint64_t Addr = *AddrOrErr;
359
360        uint64_t Size = P.second;
361        // If we're not using the debug object, compute the address of the
362        // symbol in memory (rather than that in the unrelocated object file)
363        // and use that to query the DWARFContext.
364        if (!UseDebugObj && LoadObjects) {
365          auto SecOrErr = Sym.getSection();
366          if (!SecOrErr) {
367            // TODO: Actually report errors helpfully.
368            consumeError(SecOrErr.takeError());
369            continue;
370          }
371          object::section_iterator Sec = *SecOrErr;
372          StringRef SecName;
373          Sec->getName(SecName);
374          uint64_t SectionLoadAddress =
375            LoadedObjInfo->getSectionLoadAddress(*Sec);
376          if (SectionLoadAddress != 0)
377            Addr += SectionLoadAddress - Sec->getAddress();
378        }
379
380        outs() << "Function: " << *Name << ", Size = " << Size
381               << ", Addr = " << Addr << "\n";
382
383        DILineInfoTable Lines = Context->getLineInfoForAddressRange(Addr, Size);
384        for (auto &D : Lines) {
385          outs() << "  Line info @ " << D.first - Addr << ": "
386                 << D.second.FileName << ", line:" << D.second.Line << "\n";
387        }
388      }
389    }
390  }
391
392  return 0;
393}
394
395static void doPreallocation(TrivialMemoryManager &MemMgr) {
396  // Allocate a slab of memory upfront, if required. This is used if
397  // we want to test small code models.
398  if (static_cast<intptr_t>(PreallocMemory) < 0)
399    report_fatal_error("Pre-allocated bytes of memory must be a positive integer.");
400
401  // FIXME: Limit the amount of memory that can be preallocated?
402  if (PreallocMemory != 0)
403    MemMgr.preallocateSlab(PreallocMemory);
404}
405
406static int executeInput() {
407  // Load any dylibs requested on the command line.
408  loadDylibs();
409
410  // Instantiate a dynamic linker.
411  TrivialMemoryManager MemMgr;
412  doPreallocation(MemMgr);
413  RuntimeDyld Dyld(MemMgr, MemMgr);
414
415  // If we don't have any input files, read from stdin.
416  if (!InputFileList.size())
417    InputFileList.push_back("-");
418  for (auto &File : InputFileList) {
419    // Load the input memory buffer.
420    ErrorOr<std::unique_ptr<MemoryBuffer>> InputBuffer =
421        MemoryBuffer::getFileOrSTDIN(File);
422    if (std::error_code EC = InputBuffer.getError())
423      ErrorAndExit("unable to read input: '" + EC.message() + "'");
424    Expected<std::unique_ptr<ObjectFile>> MaybeObj(
425      ObjectFile::createObjectFile((*InputBuffer)->getMemBufferRef()));
426
427    if (!MaybeObj) {
428      std::string Buf;
429      raw_string_ostream OS(Buf);
430      logAllUnhandledErrors(MaybeObj.takeError(), OS, "");
431      OS.flush();
432      ErrorAndExit("unable to create object file: '" + Buf + "'");
433    }
434
435    ObjectFile &Obj = **MaybeObj;
436
437    // Load the object file
438    Dyld.loadObject(Obj);
439    if (Dyld.hasError()) {
440      ErrorAndExit(Dyld.getErrorString());
441    }
442  }
443
444  // Resove all the relocations we can.
445  // FIXME: Error out if there are unresolved relocations.
446  Dyld.resolveRelocations();
447
448  // Get the address of the entry point (_main by default).
449  void *MainAddress = Dyld.getSymbolLocalAddress(EntryPoint);
450  if (!MainAddress)
451    ErrorAndExit("no definition for '" + EntryPoint + "'");
452
453  // Invalidate the instruction cache for each loaded function.
454  for (auto &FM : MemMgr.FunctionMemory) {
455
456    // Make sure the memory is executable.
457    // setExecutable will call InvalidateInstructionCache.
458    std::string ErrorStr;
459    if (!sys::Memory::setExecutable(FM, &ErrorStr))
460      ErrorAndExit("unable to mark function executable: '" + ErrorStr + "'");
461  }
462
463  // Dispatch to _main().
464  errs() << "loaded '" << EntryPoint << "' at: " << (void*)MainAddress << "\n";
465
466  int (*Main)(int, const char**) =
467    (int(*)(int,const char**)) uintptr_t(MainAddress);
468  const char **Argv = new const char*[2];
469  // Use the name of the first input object module as argv[0] for the target.
470  Argv[0] = InputFileList[0].c_str();
471  Argv[1] = nullptr;
472  return Main(1, Argv);
473}
474
475static int checkAllExpressions(RuntimeDyldChecker &Checker) {
476  for (const auto& CheckerFileName : CheckFiles) {
477    ErrorOr<std::unique_ptr<MemoryBuffer>> CheckerFileBuf =
478        MemoryBuffer::getFileOrSTDIN(CheckerFileName);
479    if (std::error_code EC = CheckerFileBuf.getError())
480      ErrorAndExit("unable to read input '" + CheckerFileName + "': " +
481                   EC.message());
482
483    if (!Checker.checkAllRulesInBuffer("# rtdyld-check:",
484                                       CheckerFileBuf.get().get()))
485      ErrorAndExit("some checks in '" + CheckerFileName + "' failed");
486  }
487  return 0;
488}
489
490static std::map<void *, uint64_t>
491applySpecificSectionMappings(RuntimeDyldChecker &Checker) {
492
493  std::map<void*, uint64_t> SpecificMappings;
494
495  for (StringRef Mapping : SpecificSectionMappings) {
496
497    size_t EqualsIdx = Mapping.find_first_of("=");
498    std::string SectionIDStr = Mapping.substr(0, EqualsIdx);
499    size_t ComaIdx = Mapping.find_first_of(",");
500
501    if (ComaIdx == StringRef::npos)
502      report_fatal_error("Invalid section specification '" + Mapping +
503                         "'. Should be '<file name>,<section name>=<addr>'");
504
505    std::string FileName = SectionIDStr.substr(0, ComaIdx);
506    std::string SectionName = SectionIDStr.substr(ComaIdx + 1);
507
508    uint64_t OldAddrInt;
509    std::string ErrorMsg;
510    std::tie(OldAddrInt, ErrorMsg) =
511      Checker.getSectionAddr(FileName, SectionName, true);
512
513    if (ErrorMsg != "")
514      report_fatal_error(ErrorMsg);
515
516    void* OldAddr = reinterpret_cast<void*>(static_cast<uintptr_t>(OldAddrInt));
517
518    std::string NewAddrStr = Mapping.substr(EqualsIdx + 1);
519    uint64_t NewAddr;
520
521    if (StringRef(NewAddrStr).getAsInteger(0, NewAddr))
522      report_fatal_error("Invalid section address in mapping '" + Mapping +
523                         "'.");
524
525    Checker.getRTDyld().mapSectionAddress(OldAddr, NewAddr);
526    SpecificMappings[OldAddr] = NewAddr;
527  }
528
529  return SpecificMappings;
530}
531
532// Scatter sections in all directions!
533// Remaps section addresses for -verify mode. The following command line options
534// can be used to customize the layout of the memory within the phony target's
535// address space:
536// -target-addr-start <s> -- Specify where the phony target addres range starts.
537// -target-addr-end   <e> -- Specify where the phony target address range ends.
538// -target-section-sep <d> -- Specify how big a gap should be left between the
539//                            end of one section and the start of the next.
540//                            Defaults to zero. Set to something big
541//                            (e.g. 1 << 32) to stress-test stubs, GOTs, etc.
542//
543static void remapSectionsAndSymbols(const llvm::Triple &TargetTriple,
544                                    TrivialMemoryManager &MemMgr,
545                                    RuntimeDyldChecker &Checker) {
546
547  // Set up a work list (section addr/size pairs).
548  typedef std::list<std::pair<void*, uint64_t>> WorklistT;
549  WorklistT Worklist;
550
551  for (const auto& CodeSection : MemMgr.FunctionMemory)
552    Worklist.push_back(std::make_pair(CodeSection.base(), CodeSection.size()));
553  for (const auto& DataSection : MemMgr.DataMemory)
554    Worklist.push_back(std::make_pair(DataSection.base(), DataSection.size()));
555
556  // Apply any section-specific mappings that were requested on the command
557  // line.
558  typedef std::map<void*, uint64_t> AppliedMappingsT;
559  AppliedMappingsT AppliedMappings = applySpecificSectionMappings(Checker);
560
561  // Keep an "already allocated" mapping of section target addresses to sizes.
562  // Sections whose address mappings aren't specified on the command line will
563  // allocated around the explicitly mapped sections while maintaining the
564  // minimum separation.
565  std::map<uint64_t, uint64_t> AlreadyAllocated;
566
567  // Move the previously applied mappings into the already-allocated map.
568  for (WorklistT::iterator I = Worklist.begin(), E = Worklist.end();
569       I != E;) {
570    WorklistT::iterator Tmp = I;
571    ++I;
572    AppliedMappingsT::iterator AI = AppliedMappings.find(Tmp->first);
573
574    if (AI != AppliedMappings.end()) {
575      AlreadyAllocated[AI->second] = Tmp->second;
576      Worklist.erase(Tmp);
577    }
578  }
579
580  // If the -target-addr-end option wasn't explicitly passed, then set it to a
581  // sensible default based on the target triple.
582  if (TargetAddrEnd.getNumOccurrences() == 0) {
583    if (TargetTriple.isArch16Bit())
584      TargetAddrEnd = (1ULL << 16) - 1;
585    else if (TargetTriple.isArch32Bit())
586      TargetAddrEnd = (1ULL << 32) - 1;
587    // TargetAddrEnd already has a sensible default for 64-bit systems, so
588    // there's nothing to do in the 64-bit case.
589  }
590
591  // Process any elements remaining in the worklist.
592  while (!Worklist.empty()) {
593    std::pair<void*, uint64_t> CurEntry = Worklist.front();
594    Worklist.pop_front();
595
596    uint64_t NextSectionAddr = TargetAddrStart;
597
598    for (const auto &Alloc : AlreadyAllocated)
599      if (NextSectionAddr + CurEntry.second + TargetSectionSep <= Alloc.first)
600        break;
601      else
602        NextSectionAddr = Alloc.first + Alloc.second + TargetSectionSep;
603
604    AlreadyAllocated[NextSectionAddr] = CurEntry.second;
605    Checker.getRTDyld().mapSectionAddress(CurEntry.first, NextSectionAddr);
606  }
607
608  // Add dummy symbols to the memory manager.
609  for (const auto &Mapping : DummySymbolMappings) {
610    size_t EqualsIdx = Mapping.find_first_of("=");
611
612    if (EqualsIdx == StringRef::npos)
613      report_fatal_error("Invalid dummy symbol specification '" + Mapping +
614                         "'. Should be '<symbol name>=<addr>'");
615
616    std::string Symbol = Mapping.substr(0, EqualsIdx);
617    std::string AddrStr = Mapping.substr(EqualsIdx + 1);
618
619    uint64_t Addr;
620    if (StringRef(AddrStr).getAsInteger(0, Addr))
621      report_fatal_error("Invalid symbol mapping '" + Mapping + "'.");
622
623    MemMgr.addDummySymbol(Symbol, Addr);
624  }
625}
626
627// Load and link the objects specified on the command line, but do not execute
628// anything. Instead, attach a RuntimeDyldChecker instance and call it to
629// verify the correctness of the linked memory.
630static int linkAndVerify() {
631
632  // Check for missing triple.
633  if (TripleName == "")
634    ErrorAndExit("-triple required when running in -verify mode.");
635
636  // Look up the target and build the disassembler.
637  Triple TheTriple(Triple::normalize(TripleName));
638  std::string ErrorStr;
639  const Target *TheTarget =
640    TargetRegistry::lookupTarget("", TheTriple, ErrorStr);
641  if (!TheTarget)
642    ErrorAndExit("Error accessing target '" + TripleName + "': " + ErrorStr);
643
644  TripleName = TheTriple.getTriple();
645
646  std::unique_ptr<MCSubtargetInfo> STI(
647    TheTarget->createMCSubtargetInfo(TripleName, MCPU, ""));
648  if (!STI)
649    ErrorAndExit("Unable to create subtarget info!");
650
651  std::unique_ptr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
652  if (!MRI)
653    ErrorAndExit("Unable to create target register info!");
654
655  std::unique_ptr<MCAsmInfo> MAI(TheTarget->createMCAsmInfo(*MRI, TripleName));
656  if (!MAI)
657    ErrorAndExit("Unable to create target asm info!");
658
659  MCContext Ctx(MAI.get(), MRI.get(), nullptr);
660
661  std::unique_ptr<MCDisassembler> Disassembler(
662    TheTarget->createMCDisassembler(*STI, Ctx));
663  if (!Disassembler)
664    ErrorAndExit("Unable to create disassembler!");
665
666  std::unique_ptr<MCInstrInfo> MII(TheTarget->createMCInstrInfo());
667
668  std::unique_ptr<MCInstPrinter> InstPrinter(
669      TheTarget->createMCInstPrinter(Triple(TripleName), 0, *MAI, *MII, *MRI));
670
671  // Load any dylibs requested on the command line.
672  loadDylibs();
673
674  // Instantiate a dynamic linker.
675  TrivialMemoryManager MemMgr;
676  doPreallocation(MemMgr);
677  RuntimeDyld Dyld(MemMgr, MemMgr);
678  Dyld.setProcessAllSections(true);
679  RuntimeDyldChecker Checker(Dyld, Disassembler.get(), InstPrinter.get(),
680                             llvm::dbgs());
681
682  // If we don't have any input files, read from stdin.
683  if (!InputFileList.size())
684    InputFileList.push_back("-");
685  for (auto &Filename : InputFileList) {
686    // Load the input memory buffer.
687    ErrorOr<std::unique_ptr<MemoryBuffer>> InputBuffer =
688        MemoryBuffer::getFileOrSTDIN(Filename);
689
690    if (std::error_code EC = InputBuffer.getError())
691      ErrorAndExit("unable to read input: '" + EC.message() + "'");
692
693    Expected<std::unique_ptr<ObjectFile>> MaybeObj(
694      ObjectFile::createObjectFile((*InputBuffer)->getMemBufferRef()));
695
696    if (!MaybeObj) {
697      std::string Buf;
698      raw_string_ostream OS(Buf);
699      logAllUnhandledErrors(MaybeObj.takeError(), OS, "");
700      OS.flush();
701      ErrorAndExit("unable to create object file: '" + Buf + "'");
702    }
703
704    ObjectFile &Obj = **MaybeObj;
705
706    // Load the object file
707    Dyld.loadObject(Obj);
708    if (Dyld.hasError()) {
709      ErrorAndExit(Dyld.getErrorString());
710    }
711  }
712
713  // Re-map the section addresses into the phony target address space and add
714  // dummy symbols.
715  remapSectionsAndSymbols(TheTriple, MemMgr, Checker);
716
717  // Resolve all the relocations we can.
718  Dyld.resolveRelocations();
719
720  // Register EH frames.
721  Dyld.registerEHFrames();
722
723  int ErrorCode = checkAllExpressions(Checker);
724  if (Dyld.hasError())
725    ErrorAndExit("RTDyld reported an error applying relocations:\n  " +
726                 Dyld.getErrorString());
727
728  return ErrorCode;
729}
730
731int main(int argc, char **argv) {
732  sys::PrintStackTraceOnErrorSignal(argv[0]);
733  PrettyStackTraceProgram X(argc, argv);
734
735  ProgramName = argv[0];
736  llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
737
738  llvm::InitializeAllTargetInfos();
739  llvm::InitializeAllTargetMCs();
740  llvm::InitializeAllDisassemblers();
741
742  cl::ParseCommandLineOptions(argc, argv, "llvm MC-JIT tool\n");
743
744  switch (Action) {
745  case AC_Execute:
746    return executeInput();
747  case AC_PrintDebugLineInfo:
748    return printLineInfoForInput(/* LoadObjects */ true,/* UseDebugObj */ true);
749  case AC_PrintLineInfo:
750    return printLineInfoForInput(/* LoadObjects */ true,/* UseDebugObj */false);
751  case AC_PrintObjectLineInfo:
752    return printLineInfoForInput(/* LoadObjects */false,/* UseDebugObj */false);
753  case AC_Verify:
754    return linkAndVerify();
755  }
756}
757