llvm.org GIT mirror llvm / release_34 tools / lli / lli.cpp
release_34

Tree @release_34 (Download .tar.gz)

lli.cpp @release_34raw · history · blame

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
//===- lli.cpp - LLVM Interpreter / Dynamic compiler ----------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This utility provides a simple wrapper around the LLVM Execution Engines,
// which allow the direct execution of LLVM programs through a Just-In-Time
// compiler, or through an interpreter if no JIT is available for this platform.
//
//===----------------------------------------------------------------------===//

#define DEBUG_TYPE "lli"
#include "llvm/IR/LLVMContext.h"
#include "RemoteMemoryManager.h"
#include "RemoteTarget.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/CodeGen/LinkAllCodegenComponents.h"
#include "llvm/ExecutionEngine/GenericValue.h"
#include "llvm/ExecutionEngine/Interpreter.h"
#include "llvm/ExecutionEngine/JIT.h"
#include "llvm/ExecutionEngine/JITEventListener.h"
#include "llvm/ExecutionEngine/JITMemoryManager.h"
#include "llvm/ExecutionEngine/MCJIT.h"
#include "llvm/ExecutionEngine/SectionMemoryManager.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/TypeBuilder.h"
#include "llvm/IRReader/IRReader.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/DynamicLibrary.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Memory.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PluginLoader.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/Instrumentation.h"
#include <cerrno>

#ifdef __CYGWIN__
#include <cygwin/version.h>
#if defined(CYGWIN_VERSION_DLL_MAJOR) && CYGWIN_VERSION_DLL_MAJOR<1007
#define DO_NOTHING_ATEXIT 1
#endif
#endif

using namespace llvm;

namespace {
  cl::opt<std::string>
  InputFile(cl::desc("<input bitcode>"), cl::Positional, cl::init("-"));

  cl::list<std::string>
  InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>..."));

  cl::opt<bool> ForceInterpreter("force-interpreter",
                                 cl::desc("Force interpretation: disable JIT"),
                                 cl::init(false));

  cl::opt<bool> UseMCJIT(
    "use-mcjit", cl::desc("Enable use of the MC-based JIT (if available)"),
    cl::init(false));

  cl::opt<bool> DebugIR(
    "debug-ir", cl::desc("Generate debug information to allow debugging IR."),
    cl::init(false));

  // The MCJIT supports building for a target address space separate from
  // the JIT compilation process. Use a forked process and a copying
  // memory manager with IPC to execute using this functionality.
  cl::opt<bool> RemoteMCJIT("remote-mcjit",
    cl::desc("Execute MCJIT'ed code in a separate process."),
    cl::init(false));

  // Manually specify the child process for remote execution. This overrides
  // the simulated remote execution that allocates address space for child
  // execution. The child process will be executed and will communicate with
  // lli via stdin/stdout pipes.
  cl::opt<std::string>
  MCJITRemoteProcess("mcjit-remote-process",
            cl::desc("Specify the filename of the process to launch "
                     "for remote MCJIT execution.  If none is specified,"
                     "\n\tremote execution will be simulated in-process."),
            cl::value_desc("filename"),
            cl::init(""));

  // Determine optimization level.
  cl::opt<char>
  OptLevel("O",
           cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
                    "(default = '-O2')"),
           cl::Prefix,
           cl::ZeroOrMore,
           cl::init(' '));

  cl::opt<std::string>
  TargetTriple("mtriple", cl::desc("Override target triple for module"));

  cl::opt<std::string>
  MArch("march",
        cl::desc("Architecture to generate assembly for (see --version)"));

  cl::opt<std::string>
  MCPU("mcpu",
       cl::desc("Target a specific cpu type (-mcpu=help for details)"),
       cl::value_desc("cpu-name"),
       cl::init(""));

  cl::list<std::string>
  MAttrs("mattr",
         cl::CommaSeparated,
         cl::desc("Target specific attributes (-mattr=help for details)"),
         cl::value_desc("a1,+a2,-a3,..."));

  cl::opt<std::string>
  EntryFunc("entry-function",
            cl::desc("Specify the entry function (default = 'main') "
                     "of the executable"),
            cl::value_desc("function"),
            cl::init("main"));

  cl::list<std::string>
  ExtraModules("extra-module",
         cl::desc("Extra modules to be loaded"),
         cl::value_desc("input bitcode"));

  cl::opt<std::string>
  FakeArgv0("fake-argv0",
            cl::desc("Override the 'argv[0]' value passed into the executing"
                     " program"), cl::value_desc("executable"));

  cl::opt<bool>
  DisableCoreFiles("disable-core-files", cl::Hidden,
                   cl::desc("Disable emission of core files if possible"));

  cl::opt<bool>
  NoLazyCompilation("disable-lazy-compilation",
                  cl::desc("Disable JIT lazy compilation"),
                  cl::init(false));

  cl::opt<Reloc::Model>
  RelocModel("relocation-model",
             cl::desc("Choose relocation model"),
             cl::init(Reloc::Default),
             cl::values(
            clEnumValN(Reloc::Default, "default",
                       "Target default relocation model"),
            clEnumValN(Reloc::Static, "static",
                       "Non-relocatable code"),
            clEnumValN(Reloc::PIC_, "pic",
                       "Fully relocatable, position independent code"),
            clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic",
                       "Relocatable external references, non-relocatable code"),
            clEnumValEnd));

  cl::opt<llvm::CodeModel::Model>
  CMModel("code-model",
          cl::desc("Choose code model"),
          cl::init(CodeModel::JITDefault),
          cl::values(clEnumValN(CodeModel::JITDefault, "default",
                                "Target default JIT code model"),
                     clEnumValN(CodeModel::Small, "small",
                                "Small code model"),
                     clEnumValN(CodeModel::Kernel, "kernel",
                                "Kernel code model"),
                     clEnumValN(CodeModel::Medium, "medium",
                                "Medium code model"),
                     clEnumValN(CodeModel::Large, "large",
                                "Large code model"),
                     clEnumValEnd));

  cl::opt<bool>
  GenerateSoftFloatCalls("soft-float",
    cl::desc("Generate software floating point library calls"),
    cl::init(false));

  cl::opt<llvm::FloatABI::ABIType>
  FloatABIForCalls("float-abi",
                   cl::desc("Choose float ABI type"),
                   cl::init(FloatABI::Default),
                   cl::values(
                     clEnumValN(FloatABI::Default, "default",
                                "Target default float ABI type"),
                     clEnumValN(FloatABI::Soft, "soft",
                                "Soft float ABI (implied by -soft-float)"),
                     clEnumValN(FloatABI::Hard, "hard",
                                "Hard float ABI (uses FP registers)"),
                     clEnumValEnd));
  cl::opt<bool>
// In debug builds, make this default to true.
#ifdef NDEBUG
#define EMIT_DEBUG false
#else
#define EMIT_DEBUG true
#endif
  EmitJitDebugInfo("jit-emit-debug",
    cl::desc("Emit debug information to debugger"),
    cl::init(EMIT_DEBUG));
#undef EMIT_DEBUG

  static cl::opt<bool>
  EmitJitDebugInfoToDisk("jit-emit-debug-to-disk",
    cl::Hidden,
    cl::desc("Emit debug info objfiles to disk"),
    cl::init(false));
}

static ExecutionEngine *EE = 0;

static void do_shutdown() {
  // Cygwin-1.5 invokes DLL's dtors before atexit handler.
#ifndef DO_NOTHING_ATEXIT
  delete EE;
  llvm_shutdown();
#endif
}

// On Mingw and Cygwin, an external symbol named '__main' is called from the
// generated 'main' function to allow static intialization.  To avoid linking
// problems with remote targets (because lli's remote target support does not
// currently handle external linking) we add a secondary module which defines
// an empty '__main' function.
static void addCygMingExtraModule(ExecutionEngine *EE,
                                  LLVMContext &Context,
                                  StringRef TargetTripleStr) {
  IRBuilder<> Builder(Context);
  Triple TargetTriple(TargetTripleStr);

  // Create a new module.
  Module *M = new Module("CygMingHelper", Context);
  M->setTargetTriple(TargetTripleStr);

  // Create an empty function named "__main".
  Function *Result;
  if (TargetTriple.isArch64Bit()) {
    Result = Function::Create(
      TypeBuilder<int64_t(void), false>::get(Context),
      GlobalValue::ExternalLinkage, "__main", M);
  } else {
    Result = Function::Create(
      TypeBuilder<int32_t(void), false>::get(Context),
      GlobalValue::ExternalLinkage, "__main", M);
  }
  BasicBlock *BB = BasicBlock::Create(Context, "__main", Result);
  Builder.SetInsertPoint(BB);
  Value *ReturnVal;
  if (TargetTriple.isArch64Bit())
    ReturnVal = ConstantInt::get(Context, APInt(64, 0));
  else
    ReturnVal = ConstantInt::get(Context, APInt(32, 0));
  Builder.CreateRet(ReturnVal);

  // Add this new module to the ExecutionEngine.
  EE->addModule(M);
}


//===----------------------------------------------------------------------===//
// main Driver function
//
int main(int argc, char **argv, char * const *envp) {
  sys::PrintStackTraceOnErrorSignal();
  PrettyStackTraceProgram X(argc, argv);

  LLVMContext &Context = getGlobalContext();
  atexit(do_shutdown);  // Call llvm_shutdown() on exit.

  // If we have a native target, initialize it to ensure it is linked in and
  // usable by the JIT.
  InitializeNativeTarget();
  InitializeNativeTargetAsmPrinter();
  InitializeNativeTargetAsmParser();

  cl::ParseCommandLineOptions(argc, argv,
                              "llvm interpreter & dynamic compiler\n");

  // If the user doesn't want core files, disable them.
  if (DisableCoreFiles)
    sys::Process::PreventCoreFiles();

  // Load the bitcode...
  SMDiagnostic Err;
  Module *Mod = ParseIRFile(InputFile, Err, Context);
  if (!Mod) {
    Err.print(argv[0], errs());
    return 1;
  }

  // If not jitting lazily, load the whole bitcode file eagerly too.
  std::string ErrorMsg;
  if (NoLazyCompilation) {
    if (Mod->MaterializeAllPermanently(&ErrorMsg)) {
      errs() << argv[0] << ": bitcode didn't read correctly.\n";
      errs() << "Reason: " << ErrorMsg << "\n";
      exit(1);
    }
  }

  if (DebugIR) {
    if (!UseMCJIT) {
      errs() << "warning: -debug-ir used without -use-mcjit. Only partial debug"
        << " information will be emitted by the non-MC JIT engine. To see full"
        << " source debug information, enable the flag '-use-mcjit'.\n";

    }
    ModulePass *DebugIRPass = createDebugIRPass();
    DebugIRPass->runOnModule(*Mod);
  }

  EngineBuilder builder(Mod);
  builder.setMArch(MArch);
  builder.setMCPU(MCPU);
  builder.setMAttrs(MAttrs);
  builder.setRelocationModel(RelocModel);
  builder.setCodeModel(CMModel);
  builder.setErrorStr(&ErrorMsg);
  builder.setEngineKind(ForceInterpreter
                        ? EngineKind::Interpreter
                        : EngineKind::JIT);

  // If we are supposed to override the target triple, do so now.
  if (!TargetTriple.empty())
    Mod->setTargetTriple(Triple::normalize(TargetTriple));

  // Enable MCJIT if desired.
  RTDyldMemoryManager *RTDyldMM = 0;
  if (UseMCJIT && !ForceInterpreter) {
    builder.setUseMCJIT(true);
    if (RemoteMCJIT)
      RTDyldMM = new RemoteMemoryManager();
    else
      RTDyldMM = new SectionMemoryManager();
    builder.setMCJITMemoryManager(RTDyldMM);
  } else {
    if (RemoteMCJIT) {
      errs() << "error: Remote process execution requires -use-mcjit\n";
      exit(1);
    }
    builder.setJITMemoryManager(ForceInterpreter ? 0 :
                                JITMemoryManager::CreateDefaultMemManager());
  }

  CodeGenOpt::Level OLvl = CodeGenOpt::Default;
  switch (OptLevel) {
  default:
    errs() << argv[0] << ": invalid optimization level.\n";
    return 1;
  case ' ': break;
  case '0': OLvl = CodeGenOpt::None; break;
  case '1': OLvl = CodeGenOpt::Less; break;
  case '2': OLvl = CodeGenOpt::Default; break;
  case '3': OLvl = CodeGenOpt::Aggressive; break;
  }
  builder.setOptLevel(OLvl);

  TargetOptions Options;
  Options.UseSoftFloat = GenerateSoftFloatCalls;
  if (FloatABIForCalls != FloatABI::Default)
    Options.FloatABIType = FloatABIForCalls;
  if (GenerateSoftFloatCalls)
    FloatABIForCalls = FloatABI::Soft;

  // Remote target execution doesn't handle EH or debug registration.
  if (!RemoteMCJIT) {
    Options.JITEmitDebugInfo = EmitJitDebugInfo;
    Options.JITEmitDebugInfoToDisk = EmitJitDebugInfoToDisk;
  }

  builder.setTargetOptions(Options);

  EE = builder.create();
  if (!EE) {
    if (!ErrorMsg.empty())
      errs() << argv[0] << ": error creating EE: " << ErrorMsg << "\n";
    else
      errs() << argv[0] << ": unknown error creating EE!\n";
    exit(1);
  }

  // Load any additional modules specified on the command line.
  for (unsigned i = 0, e = ExtraModules.size(); i != e; ++i) {
    Module *XMod = ParseIRFile(ExtraModules[i], Err, Context);
    if (!XMod) {
      Err.print(argv[0], errs());
      return 1;
    }
    EE->addModule(XMod);
  }

  // If the target is Cygwin/MingW and we are generating remote code, we
  // need an extra module to help out with linking.
  if (RemoteMCJIT && Triple(Mod->getTargetTriple()).isOSCygMing()) {
    addCygMingExtraModule(EE, Context, Mod->getTargetTriple());
  }

  // The following functions have no effect if their respective profiling
  // support wasn't enabled in the build configuration.
  EE->RegisterJITEventListener(
                JITEventListener::createOProfileJITEventListener());
  EE->RegisterJITEventListener(
                JITEventListener::createIntelJITEventListener());

  if (!NoLazyCompilation && RemoteMCJIT) {
    errs() << "warning: remote mcjit does not support lazy compilation\n";
    NoLazyCompilation = true;
  }
  EE->DisableLazyCompilation(NoLazyCompilation);

  // If the user specifically requested an argv[0] to pass into the program,
  // do it now.
  if (!FakeArgv0.empty()) {
    InputFile = FakeArgv0;
  } else {
    // Otherwise, if there is a .bc suffix on the executable strip it off, it
    // might confuse the program.
    if (StringRef(InputFile).endswith(".bc"))
      InputFile.erase(InputFile.length() - 3);
  }

  // Add the module's name to the start of the vector of arguments to main().
  InputArgv.insert(InputArgv.begin(), InputFile);

  // Call the main function from M as if its signature were:
  //   int main (int argc, char **argv, const char **envp)
  // using the contents of Args to determine argc & argv, and the contents of
  // EnvVars to determine envp.
  //
  Function *EntryFn = Mod->getFunction(EntryFunc);
  if (!EntryFn) {
    errs() << '\'' << EntryFunc << "\' function not found in module.\n";
    return -1;
  }

  // Reset errno to zero on entry to main.
  errno = 0;

  int Result;

  if (!RemoteMCJIT) {
    // If the program doesn't explicitly call exit, we will need the Exit
    // function later on to make an explicit call, so get the function now.
    Constant *Exit = Mod->getOrInsertFunction("exit", Type::getVoidTy(Context),
                                                      Type::getInt32Ty(Context),
                                                      NULL);

    // Run static constructors.
    if (UseMCJIT && !ForceInterpreter) {
      // Give MCJIT a chance to apply relocations and set page permissions.
      EE->finalizeObject();
    }
    EE->runStaticConstructorsDestructors(false);

    if (!UseMCJIT && NoLazyCompilation) {
      for (Module::iterator I = Mod->begin(), E = Mod->end(); I != E; ++I) {
        Function *Fn = &*I;
        if (Fn != EntryFn && !Fn->isDeclaration())
          EE->getPointerToFunction(Fn);
      }
    }

    // Trigger compilation separately so code regions that need to be 
    // invalidated will be known.
    (void)EE->getPointerToFunction(EntryFn);
    // Clear instruction cache before code will be executed.
    if (RTDyldMM)
      static_cast<SectionMemoryManager*>(RTDyldMM)->invalidateInstructionCache();

    // Run main.
    Result = EE->runFunctionAsMain(EntryFn, InputArgv, envp);

    // Run static destructors.
    EE->runStaticConstructorsDestructors(true);

    // If the program didn't call exit explicitly, we should call it now.
    // This ensures that any atexit handlers get called correctly.
    if (Function *ExitF = dyn_cast<Function>(Exit)) {
      std::vector<GenericValue> Args;
      GenericValue ResultGV;
      ResultGV.IntVal = APInt(32, Result);
      Args.push_back(ResultGV);
      EE->runFunction(ExitF, Args);
      errs() << "ERROR: exit(" << Result << ") returned!\n";
      abort();
    } else {
      errs() << "ERROR: exit defined with wrong prototype!\n";
      abort();
    }
  } else {
    // else == "if (RemoteMCJIT)"

    // Remote target MCJIT doesn't (yet) support static constructors. No reason
    // it couldn't. This is a limitation of the LLI implemantation, not the
    // MCJIT itself. FIXME.
    //
    RemoteMemoryManager *MM = static_cast<RemoteMemoryManager*>(RTDyldMM);
    // Everything is prepared now, so lay out our program for the target
    // address space, assign the section addresses to resolve any relocations,
    // and send it to the target.

    OwningPtr<RemoteTarget> Target;
    if (!MCJITRemoteProcess.empty()) { // Remote execution on a child process
      if (!RemoteTarget::hostSupportsExternalRemoteTarget()) {
        errs() << "Warning: host does not support external remote targets.\n"
               << "  Defaulting to simulated remote execution\n";
        Target.reset(RemoteTarget::createRemoteTarget());
      } else {
        std::string ChildEXE = sys::FindProgramByName(MCJITRemoteProcess);
        if (ChildEXE == "") {
          errs() << "Unable to find child target: '\''" << MCJITRemoteProcess << "\'\n";
          return -1;
        }
        Target.reset(RemoteTarget::createExternalRemoteTarget(ChildEXE));
      }
    } else {
      // No child process name provided, use simulated remote execution.
      Target.reset(RemoteTarget::createRemoteTarget());
    }

    // Give the memory manager a pointer to our remote target interface object.
    MM->setRemoteTarget(Target.get());

    // Create the remote target.
    Target->create();

    // Since we're executing in a (at least simulated) remote address space,
    // we can't use the ExecutionEngine::runFunctionAsMain(). We have to
    // grab the function address directly here and tell the remote target
    // to execute the function.
    //
    // Our memory manager will map generated code into the remote address
    // space as it is loaded and copy the bits over during the finalizeMemory
    // operation.
    //
    // FIXME: argv and envp handling.
    uint64_t Entry = EE->getFunctionAddress(EntryFn->getName().str());

    DEBUG(dbgs() << "Executing '" << EntryFn->getName() << "' at 0x"
                 << format("%llx", Entry) << "\n");

    if (Target->executeCode(Entry, Result))
      errs() << "ERROR: " << Target->getErrorMsg() << "\n";

    // Like static constructors, the remote target MCJIT support doesn't handle
    // this yet. It could. FIXME.

    // Stop the remote target
    Target->stop();
  }

  return Result;
}