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.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
42 using namespace llvm;
43 using namespace llvm::object;
44
45 static cl::list<std::string>
46 InputFileList(cl::Positional, cl::ZeroOrMore,
47 cl::desc("<input file>"));
48
49 enum ActionType {
50 AC_Execute,
51 AC_PrintObjectLineInfo,
52 AC_PrintLineInfo,
53 AC_PrintDebugLineInfo,
54 AC_Verify
55 };
56
57 static cl::opt<ActionType>
58 Action(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
72 static cl::opt<std::string>
73 EntryPoint("entry",
74 cl::desc("Function to call as entry point."),
75 cl::init("_main"));
76
77 static cl::list<std::string>
78 Dylibs("dylib",
79 cl::desc("Add library."),
80 cl::ZeroOrMore);
81
82 static cl::opt<std::string>
83 TripleName("triple", cl::desc("Target triple for disassembler"));
84
85 static cl::opt<std::string>
86 MCPU("mcpu",
87 cl::desc("Target a specific cpu type (-mcpu=help for details)"),
88 cl::value_desc("cpu-name"),
89 cl::init(""));
90
91 static cl::list<std::string>
92 CheckFiles("check",
93 cl::desc("File containing RuntimeDyld verifier checks."),
94 cl::ZeroOrMore);
95
96 static cl::opt<uint64_t>
97 PreallocMemory("preallocate",
98 cl::desc("Allocate memory upfront rather than on-demand"),
99 cl::init(0));
100
101 static cl::opt<uint64_t>
102 TargetAddrStart("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
108 static cl::opt<uint64_t>
109 TargetAddrEnd("target-addr-end",
110 cl::desc("For -verify only: end of phony target address range."),
111 cl::init(~0ULL),
112 cl::Hidden);
113
114 static cl::opt<uint64_t>
115 TargetSectionSep("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
121 static cl::list<std::string>
122 SpecificSectionMappings("map-section",
123 cl::desc("For -verify only: Map a section to a "
124 "specific address."),
125 cl::ZeroOrMore,
126 cl::Hidden);
127
128 static cl::list<std::string>
129 DummySymbolMappings("dummy-extern",
130 cl::desc("For -verify only: Inject a symbol into the extern "
131 "symbol table."),
132 cl::ZeroOrMore,
133 cl::Hidden);
134
135 static cl::opt<bool>
136 PrintAllocationRequests("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.
145 class TrivialMemoryManager : public RTDyldMemoryManager {
146 public:
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
getPointerToNamedFunction(const std::string & Name,bool AbortOnFailure=true)157 void *getPointerToNamedFunction(const std::string &Name,
158 bool AbortOnFailure = true) override {
159 return nullptr;
160 }
161
finalizeMemory(std::string * ErrMsg)162 bool finalizeMemory(std::string *ErrMsg) override { return false; }
163
addDummySymbol(const std::string & Name,uint64_t Addr)164 void addDummySymbol(const std::string &Name, uint64_t Addr) {
165 DummyExterns[Name] = Addr;
166 }
167
findSymbol(const std::string & Name)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
registerEHFrames(uint8_t * Addr,uint64_t LoadAddr,size_t Size)177 void registerEHFrames(uint8_t *Addr, uint64_t LoadAddr,
178 size_t Size) override {}
deregisterEHFrames(uint8_t * Addr,uint64_t LoadAddr,size_t Size)179 void deregisterEHFrames(uint8_t *Addr, uint64_t LoadAddr,
180 size_t Size) override {}
181
preallocateSlab(uint64_t Size)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
allocateFromSlab(uintptr_t Size,unsigned Alignment,bool isCode)193 uint8_t *allocateFromSlab(uintptr_t Size, unsigned Alignment, bool isCode) {
194 Size = RoundUpToAlignment(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
208 private:
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
allocateCodeSection(uintptr_t Size,unsigned Alignment,unsigned SectionID,StringRef SectionName)216 uint8_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
allocateDataSection(uintptr_t Size,unsigned Alignment,unsigned SectionID,StringRef SectionName,bool IsReadOnly)235 uint8_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
255 static const char *ProgramName;
256
Error(const Twine & Msg)257 static int Error(const Twine &Msg) {
258 errs() << ProgramName << ": error: " << Msg << "\n";
259 return 1;
260 }
261
loadDylibs()262 static 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
printLineInfoForInput(bool LoadObjects,bool UseDebugObj)274 static 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 return Error("unable to read input: '" + EC.message() + "'");
294
295 ErrorOr<std::unique_ptr<ObjectFile>> MaybeObj(
296 ObjectFile::createObjectFile((*InputBuffer)->getMemBufferRef()));
297
298 if (std::error_code EC = MaybeObj.getError())
299 return Error("unable to create object file: '" + EC.message() + "'");
300
301 ObjectFile &Obj = **MaybeObj;
302
303 OwningBinary<ObjectFile> DebugObj;
304 std::unique_ptr<RuntimeDyld::LoadedObjectInfo> LoadedObjInfo = nullptr;
305 ObjectFile *SymbolObj = &Obj;
306 if (LoadObjects) {
307 // Load the object file
308 LoadedObjInfo =
309 Dyld.loadObject(Obj);
310
311 if (Dyld.hasError())
312 return Error(Dyld.getErrorString());
313
314 // Resolve all the relocations we can.
315 Dyld.resolveRelocations();
316
317 if (UseDebugObj) {
318 DebugObj = LoadedObjInfo->getObjectForDebug(Obj);
319 SymbolObj = DebugObj.getBinary();
320 LoadedObjInfo.reset();
321 }
322 }
323
324 std::unique_ptr<DIContext> Context(
325 new DWARFContextInMemory(*SymbolObj,LoadedObjInfo.get()));
326
327 std::vector<std::pair<SymbolRef, uint64_t>> SymAddr =
328 object::computeSymbolSizes(*SymbolObj);
329
330 // Use symbol info to iterate functions in the object.
331 for (const auto &P : SymAddr) {
332 object::SymbolRef Sym = P.first;
333 if (Sym.getType() == object::SymbolRef::ST_Function) {
334 ErrorOr<StringRef> Name = Sym.getName();
335 if (!Name)
336 continue;
337 ErrorOr<uint64_t> AddrOrErr = Sym.getAddress();
338 if (!AddrOrErr)
339 continue;
340 uint64_t Addr = *AddrOrErr;
341
342 uint64_t Size = P.second;
343 // If we're not using the debug object, compute the address of the
344 // symbol in memory (rather than that in the unrelocated object file)
345 // and use that to query the DWARFContext.
346 if (!UseDebugObj && LoadObjects) {
347 object::section_iterator Sec = *Sym.getSection();
348 StringRef SecName;
349 Sec->getName(SecName);
350 uint64_t SectionLoadAddress =
351 LoadedObjInfo->getSectionLoadAddress(*Sec);
352 if (SectionLoadAddress != 0)
353 Addr += SectionLoadAddress - Sec->getAddress();
354 }
355
356 outs() << "Function: " << *Name << ", Size = " << Size
357 << ", Addr = " << Addr << "\n";
358
359 DILineInfoTable Lines = Context->getLineInfoForAddressRange(Addr, Size);
360 for (auto &D : Lines) {
361 outs() << " Line info @ " << D.first - Addr << ": "
362 << D.second.FileName << ", line:" << D.second.Line << "\n";
363 }
364 }
365 }
366 }
367
368 return 0;
369 }
370
doPreallocation(TrivialMemoryManager & MemMgr)371 static void doPreallocation(TrivialMemoryManager &MemMgr) {
372 // Allocate a slab of memory upfront, if required. This is used if
373 // we want to test small code models.
374 if (static_cast<intptr_t>(PreallocMemory) < 0)
375 report_fatal_error("Pre-allocated bytes of memory must be a positive integer.");
376
377 // FIXME: Limit the amount of memory that can be preallocated?
378 if (PreallocMemory != 0)
379 MemMgr.preallocateSlab(PreallocMemory);
380 }
381
executeInput()382 static int executeInput() {
383 // Load any dylibs requested on the command line.
384 loadDylibs();
385
386 // Instantiate a dynamic linker.
387 TrivialMemoryManager MemMgr;
388 doPreallocation(MemMgr);
389 RuntimeDyld Dyld(MemMgr, MemMgr);
390
391 // If we don't have any input files, read from stdin.
392 if (!InputFileList.size())
393 InputFileList.push_back("-");
394 for (auto &File : InputFileList) {
395 // Load the input memory buffer.
396 ErrorOr<std::unique_ptr<MemoryBuffer>> InputBuffer =
397 MemoryBuffer::getFileOrSTDIN(File);
398 if (std::error_code EC = InputBuffer.getError())
399 return Error("unable to read input: '" + EC.message() + "'");
400 ErrorOr<std::unique_ptr<ObjectFile>> MaybeObj(
401 ObjectFile::createObjectFile((*InputBuffer)->getMemBufferRef()));
402
403 if (std::error_code EC = MaybeObj.getError())
404 return Error("unable to create object file: '" + EC.message() + "'");
405
406 ObjectFile &Obj = **MaybeObj;
407
408 // Load the object file
409 Dyld.loadObject(Obj);
410 if (Dyld.hasError()) {
411 return Error(Dyld.getErrorString());
412 }
413 }
414
415 // Resove all the relocations we can.
416 // FIXME: Error out if there are unresolved relocations.
417 Dyld.resolveRelocations();
418
419 // Get the address of the entry point (_main by default).
420 void *MainAddress = Dyld.getSymbolLocalAddress(EntryPoint);
421 if (!MainAddress)
422 return Error("no definition for '" + EntryPoint + "'");
423
424 // Invalidate the instruction cache for each loaded function.
425 for (auto &FM : MemMgr.FunctionMemory) {
426
427 // Make sure the memory is executable.
428 // setExecutable will call InvalidateInstructionCache.
429 std::string ErrorStr;
430 if (!sys::Memory::setExecutable(FM, &ErrorStr))
431 return Error("unable to mark function executable: '" + ErrorStr + "'");
432 }
433
434 // Dispatch to _main().
435 errs() << "loaded '" << EntryPoint << "' at: " << (void*)MainAddress << "\n";
436
437 int (*Main)(int, const char**) =
438 (int(*)(int,const char**)) uintptr_t(MainAddress);
439 const char **Argv = new const char*[2];
440 // Use the name of the first input object module as argv[0] for the target.
441 Argv[0] = InputFileList[0].c_str();
442 Argv[1] = nullptr;
443 return Main(1, Argv);
444 }
445
checkAllExpressions(RuntimeDyldChecker & Checker)446 static int checkAllExpressions(RuntimeDyldChecker &Checker) {
447 for (const auto& CheckerFileName : CheckFiles) {
448 ErrorOr<std::unique_ptr<MemoryBuffer>> CheckerFileBuf =
449 MemoryBuffer::getFileOrSTDIN(CheckerFileName);
450 if (std::error_code EC = CheckerFileBuf.getError())
451 return Error("unable to read input '" + CheckerFileName + "': " +
452 EC.message());
453
454 if (!Checker.checkAllRulesInBuffer("# rtdyld-check:",
455 CheckerFileBuf.get().get()))
456 return Error("some checks in '" + CheckerFileName + "' failed");
457 }
458 return 0;
459 }
460
461 static std::map<void *, uint64_t>
applySpecificSectionMappings(RuntimeDyldChecker & Checker)462 applySpecificSectionMappings(RuntimeDyldChecker &Checker) {
463
464 std::map<void*, uint64_t> SpecificMappings;
465
466 for (StringRef Mapping : SpecificSectionMappings) {
467
468 size_t EqualsIdx = Mapping.find_first_of("=");
469 std::string SectionIDStr = Mapping.substr(0, EqualsIdx);
470 size_t ComaIdx = Mapping.find_first_of(",");
471
472 if (ComaIdx == StringRef::npos)
473 report_fatal_error("Invalid section specification '" + Mapping +
474 "'. Should be '<file name>,<section name>=<addr>'");
475
476 std::string FileName = SectionIDStr.substr(0, ComaIdx);
477 std::string SectionName = SectionIDStr.substr(ComaIdx + 1);
478
479 uint64_t OldAddrInt;
480 std::string ErrorMsg;
481 std::tie(OldAddrInt, ErrorMsg) =
482 Checker.getSectionAddr(FileName, SectionName, true);
483
484 if (ErrorMsg != "")
485 report_fatal_error(ErrorMsg);
486
487 void* OldAddr = reinterpret_cast<void*>(static_cast<uintptr_t>(OldAddrInt));
488
489 std::string NewAddrStr = Mapping.substr(EqualsIdx + 1);
490 uint64_t NewAddr;
491
492 if (StringRef(NewAddrStr).getAsInteger(0, NewAddr))
493 report_fatal_error("Invalid section address in mapping '" + Mapping +
494 "'.");
495
496 Checker.getRTDyld().mapSectionAddress(OldAddr, NewAddr);
497 SpecificMappings[OldAddr] = NewAddr;
498 }
499
500 return SpecificMappings;
501 }
502
503 // Scatter sections in all directions!
504 // Remaps section addresses for -verify mode. The following command line options
505 // can be used to customize the layout of the memory within the phony target's
506 // address space:
507 // -target-addr-start <s> -- Specify where the phony target addres range starts.
508 // -target-addr-end <e> -- Specify where the phony target address range ends.
509 // -target-section-sep <d> -- Specify how big a gap should be left between the
510 // end of one section and the start of the next.
511 // Defaults to zero. Set to something big
512 // (e.g. 1 << 32) to stress-test stubs, GOTs, etc.
513 //
remapSectionsAndSymbols(const llvm::Triple & TargetTriple,TrivialMemoryManager & MemMgr,RuntimeDyldChecker & Checker)514 static void remapSectionsAndSymbols(const llvm::Triple &TargetTriple,
515 TrivialMemoryManager &MemMgr,
516 RuntimeDyldChecker &Checker) {
517
518 // Set up a work list (section addr/size pairs).
519 typedef std::list<std::pair<void*, uint64_t>> WorklistT;
520 WorklistT Worklist;
521
522 for (const auto& CodeSection : MemMgr.FunctionMemory)
523 Worklist.push_back(std::make_pair(CodeSection.base(), CodeSection.size()));
524 for (const auto& DataSection : MemMgr.DataMemory)
525 Worklist.push_back(std::make_pair(DataSection.base(), DataSection.size()));
526
527 // Apply any section-specific mappings that were requested on the command
528 // line.
529 typedef std::map<void*, uint64_t> AppliedMappingsT;
530 AppliedMappingsT AppliedMappings = applySpecificSectionMappings(Checker);
531
532 // Keep an "already allocated" mapping of section target addresses to sizes.
533 // Sections whose address mappings aren't specified on the command line will
534 // allocated around the explicitly mapped sections while maintaining the
535 // minimum separation.
536 std::map<uint64_t, uint64_t> AlreadyAllocated;
537
538 // Move the previously applied mappings into the already-allocated map.
539 for (WorklistT::iterator I = Worklist.begin(), E = Worklist.end();
540 I != E;) {
541 WorklistT::iterator Tmp = I;
542 ++I;
543 AppliedMappingsT::iterator AI = AppliedMappings.find(Tmp->first);
544
545 if (AI != AppliedMappings.end()) {
546 AlreadyAllocated[AI->second] = Tmp->second;
547 Worklist.erase(Tmp);
548 }
549 }
550
551 // If the -target-addr-end option wasn't explicitly passed, then set it to a
552 // sensible default based on the target triple.
553 if (TargetAddrEnd.getNumOccurrences() == 0) {
554 if (TargetTriple.isArch16Bit())
555 TargetAddrEnd = (1ULL << 16) - 1;
556 else if (TargetTriple.isArch32Bit())
557 TargetAddrEnd = (1ULL << 32) - 1;
558 // TargetAddrEnd already has a sensible default for 64-bit systems, so
559 // there's nothing to do in the 64-bit case.
560 }
561
562 // Process any elements remaining in the worklist.
563 while (!Worklist.empty()) {
564 std::pair<void*, uint64_t> CurEntry = Worklist.front();
565 Worklist.pop_front();
566
567 uint64_t NextSectionAddr = TargetAddrStart;
568
569 for (const auto &Alloc : AlreadyAllocated)
570 if (NextSectionAddr + CurEntry.second + TargetSectionSep <= Alloc.first)
571 break;
572 else
573 NextSectionAddr = Alloc.first + Alloc.second + TargetSectionSep;
574
575 AlreadyAllocated[NextSectionAddr] = CurEntry.second;
576 Checker.getRTDyld().mapSectionAddress(CurEntry.first, NextSectionAddr);
577 }
578
579 // Add dummy symbols to the memory manager.
580 for (const auto &Mapping : DummySymbolMappings) {
581 size_t EqualsIdx = Mapping.find_first_of("=");
582
583 if (EqualsIdx == StringRef::npos)
584 report_fatal_error("Invalid dummy symbol specification '" + Mapping +
585 "'. Should be '<symbol name>=<addr>'");
586
587 std::string Symbol = Mapping.substr(0, EqualsIdx);
588 std::string AddrStr = Mapping.substr(EqualsIdx + 1);
589
590 uint64_t Addr;
591 if (StringRef(AddrStr).getAsInteger(0, Addr))
592 report_fatal_error("Invalid symbol mapping '" + Mapping + "'.");
593
594 MemMgr.addDummySymbol(Symbol, Addr);
595 }
596 }
597
598 // Load and link the objects specified on the command line, but do not execute
599 // anything. Instead, attach a RuntimeDyldChecker instance and call it to
600 // verify the correctness of the linked memory.
linkAndVerify()601 static int linkAndVerify() {
602
603 // Check for missing triple.
604 if (TripleName == "")
605 return Error("-triple required when running in -verify mode.");
606
607 // Look up the target and build the disassembler.
608 Triple TheTriple(Triple::normalize(TripleName));
609 std::string ErrorStr;
610 const Target *TheTarget =
611 TargetRegistry::lookupTarget("", TheTriple, ErrorStr);
612 if (!TheTarget)
613 return Error("Error accessing target '" + TripleName + "': " + ErrorStr);
614
615 TripleName = TheTriple.getTriple();
616
617 std::unique_ptr<MCSubtargetInfo> STI(
618 TheTarget->createMCSubtargetInfo(TripleName, MCPU, ""));
619 if (!STI)
620 return Error("Unable to create subtarget info!");
621
622 std::unique_ptr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
623 if (!MRI)
624 return Error("Unable to create target register info!");
625
626 std::unique_ptr<MCAsmInfo> MAI(TheTarget->createMCAsmInfo(*MRI, TripleName));
627 if (!MAI)
628 return Error("Unable to create target asm info!");
629
630 MCContext Ctx(MAI.get(), MRI.get(), nullptr);
631
632 std::unique_ptr<MCDisassembler> Disassembler(
633 TheTarget->createMCDisassembler(*STI, Ctx));
634 if (!Disassembler)
635 return Error("Unable to create disassembler!");
636
637 std::unique_ptr<MCInstrInfo> MII(TheTarget->createMCInstrInfo());
638
639 std::unique_ptr<MCInstPrinter> InstPrinter(
640 TheTarget->createMCInstPrinter(Triple(TripleName), 0, *MAI, *MII, *MRI));
641
642 // Load any dylibs requested on the command line.
643 loadDylibs();
644
645 // Instantiate a dynamic linker.
646 TrivialMemoryManager MemMgr;
647 doPreallocation(MemMgr);
648 RuntimeDyld Dyld(MemMgr, MemMgr);
649 Dyld.setProcessAllSections(true);
650 RuntimeDyldChecker Checker(Dyld, Disassembler.get(), InstPrinter.get(),
651 llvm::dbgs());
652
653 // If we don't have any input files, read from stdin.
654 if (!InputFileList.size())
655 InputFileList.push_back("-");
656 for (auto &Filename : InputFileList) {
657 // Load the input memory buffer.
658 ErrorOr<std::unique_ptr<MemoryBuffer>> InputBuffer =
659 MemoryBuffer::getFileOrSTDIN(Filename);
660
661 if (std::error_code EC = InputBuffer.getError())
662 return Error("unable to read input: '" + EC.message() + "'");
663
664 ErrorOr<std::unique_ptr<ObjectFile>> MaybeObj(
665 ObjectFile::createObjectFile((*InputBuffer)->getMemBufferRef()));
666
667 if (std::error_code EC = MaybeObj.getError())
668 return Error("unable to create object file: '" + EC.message() + "'");
669
670 ObjectFile &Obj = **MaybeObj;
671
672 // Load the object file
673 Dyld.loadObject(Obj);
674 if (Dyld.hasError()) {
675 return Error(Dyld.getErrorString());
676 }
677 }
678
679 // Re-map the section addresses into the phony target address space and add
680 // dummy symbols.
681 remapSectionsAndSymbols(TheTriple, MemMgr, Checker);
682
683 // Resolve all the relocations we can.
684 Dyld.resolveRelocations();
685
686 // Register EH frames.
687 Dyld.registerEHFrames();
688
689 int ErrorCode = checkAllExpressions(Checker);
690 if (Dyld.hasError())
691 return Error("RTDyld reported an error applying relocations:\n " +
692 Dyld.getErrorString());
693
694 return ErrorCode;
695 }
696
main(int argc,char ** argv)697 int main(int argc, char **argv) {
698 sys::PrintStackTraceOnErrorSignal();
699 PrettyStackTraceProgram X(argc, argv);
700
701 ProgramName = argv[0];
702 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
703
704 llvm::InitializeAllTargetInfos();
705 llvm::InitializeAllTargetMCs();
706 llvm::InitializeAllDisassemblers();
707
708 cl::ParseCommandLineOptions(argc, argv, "llvm MC-JIT tool\n");
709
710 switch (Action) {
711 case AC_Execute:
712 return executeInput();
713 case AC_PrintDebugLineInfo:
714 return printLineInfoForInput(/* LoadObjects */ true,/* UseDebugObj */ true);
715 case AC_PrintLineInfo:
716 return printLineInfoForInput(/* LoadObjects */ true,/* UseDebugObj */false);
717 case AC_PrintObjectLineInfo:
718 return printLineInfoForInput(/* LoadObjects */false,/* UseDebugObj */false);
719 case AC_Verify:
720 return linkAndVerify();
721 }
722 }
723