mono/mini/mini-llvm-cpp.cpp

   1 //
   2 // mini-llvm-cpp.cpp: C++ support classes for the mono LLVM integration
   3 //
   4 // (C) 2009-2011 Novell, Inc.
   5 // Copyright 2011 Xamarin, Inc (http://www.xamarin.com)
   6 //
   7
   8 //
   9 // We need to override some stuff in LLVM, but this cannot be done using the C
  10 // interface, so we have to use some C++ code here.
  11 // The things which we override are:
  12 // - the default JIT code manager used by LLVM doesn't allocate memory using
  13 //   MAP_32BIT, we require it.
  14 // - add some callbacks so we can obtain the size of methods and their exception
  15 //   tables.
  16 //
  17
  18 //
  19 // Mono's internal header files are not C++ clean, so avoid including them if
  20 // possible
  21 //
  22
  23 #include "config.h"
  24 //undef those as llvm defines them on its own config.h as well.
  25 #undef PACKAGE_BUGREPORT
  26 #undef PACKAGE_NAME
  27 #undef PACKAGE_STRING
  28 #undef PACKAGE_TARNAME
  29 #undef PACKAGE_VERSION
  30
  31 #include <stdint.h>
  32
  33 #include <llvm/Support/raw_ostream.h>
  34 #include <llvm/PassManager.h>
  35 #include <llvm/ExecutionEngine/ExecutionEngine.h>
  36 #include <llvm/ExecutionEngine/JITMemoryManager.h>
  37 #include <llvm/ExecutionEngine/JITEventListener.h>
  38 #include <llvm/Target/TargetOptions.h>
  39 #include <llvm/Target/TargetData.h>
  40 #include <llvm/Target/TargetRegisterInfo.h>
  41 #include <llvm/Analysis/Verifier.h>
  42 #include <llvm/Analysis/Passes.h>
  43 #include <llvm/Transforms/Scalar.h>
  44 #include <llvm/Support/CommandLine.h>
  45 #include "llvm/Support/PassNameParser.h"
  46 #include "llvm/Support/PrettyStackTrace.h"
  47 #include <llvm/CodeGen/Passes.h>
  48 #include <llvm/CodeGen/MachineFunctionPass.h>
  49 #include <llvm/CodeGen/MachineFunction.h>
  50 #include <llvm/CodeGen/MachineFrameInfo.h>
  51 //#include <llvm/LinkAllPasses.h>
  52
  53 #include "llvm-c/Core.h"
  54 #include "llvm-c/ExecutionEngine.h"
  55
  56 #include "mini-llvm-cpp.h"
  57
  58 #define LLVM_CHECK_VERSION(major,minor) \
  59         ((LLVM_MAJOR_VERSION > (major)) ||                                                                      \
  60          ((LLVM_MAJOR_VERSION == (major)) && (LLVM_MINOR_VERSION >= (minor))))
  61
  62 // extern "C" void LLVMInitializeARMTargetInfo();
  63 // extern "C" void LLVMInitializeARMTarget ();
  64 // extern "C" void LLVMInitializeARMTargetMC ();
  65
  66 using namespace llvm;
  67
  68 class MonoJITMemoryManager : public JITMemoryManager
  69 {
  70 private:
  71         JITMemoryManager *mm;
  72
  73 public:
  74         /* Callbacks installed by mono */
  75         AllocCodeMemoryCb *alloc_cb;
  76         DlSymCb *dlsym_cb;
  77
  78         MonoJITMemoryManager ();
  79         ~MonoJITMemoryManager ();
  80
  81         void setMemoryWritable (void);
  82
  83         void setMemoryExecutable (void);
  84
  85         void AllocateGOT();
  86
  87     unsigned char *getGOTBase() const {
  88                 return mm->getGOTBase ();
  89     }
  90
  91         void setPoisonMemory(bool) {
  92         }
  93
  94         unsigned char *startFunctionBody(const Function *F,
  95                                                                          uintptr_t &ActualSize);
  96
  97         unsigned char *allocateStub(const GlobalValue* F, unsigned StubSize,
  98                                                                  unsigned Alignment);
  99
 100         void endFunctionBody(const Function *F, unsigned char *FunctionStart,
 101                                                  unsigned char *FunctionEnd);
 102
 103         unsigned char *allocateSpace(intptr_t Size, unsigned Alignment);
 104
 105         uint8_t *allocateGlobal(uintptr_t Size, unsigned Alignment);
 106
 107         void deallocateMemForFunction(const Function *F);
 108
 109         unsigned char*startExceptionTable(const Function* F,
 110                                                                           uintptr_t &ActualSize);
 111
 112         void endExceptionTable(const Function *F, unsigned char *TableStart,
 113                                                    unsigned char *TableEnd,
 114                                                    unsigned char* FrameRegister);
 115
 116         virtual void deallocateFunctionBody(void*) {
 117         }
 118
 119         virtual void deallocateExceptionTable(void*) {
 120         }
 121
 122         virtual uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment,
 123                                                                                  unsigned SectionID) {
 124                 // FIXME:
 125                 assert(0);
 126                 return NULL;
 127         }
 128
 129         virtual uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment,
 130                                                                                  unsigned SectionID) {
 131                 // FIXME:
 132                 assert(0);
 133                 return NULL;
 134         }
 135
 136         virtual void* getPointerToNamedFunction(const std::string &Name, bool AbortOnFailure) {
 137                 void *res;
 138                 char *err;
 139
 140                 err = dlsym_cb (Name.c_str (), &res);
 141                 if (err) {
 142                         outs () << "Unable to resolve: " << Name << ": " << err << "\n";
 143                         assert(0);
 144                         return NULL;
 145                 }
 146                 return res;
 147         }
 148 };
 149
 150 MonoJITMemoryManager::MonoJITMemoryManager ()
 151 {
 152         mm = JITMemoryManager::CreateDefaultMemManager ();
 153 }
 154
 155 MonoJITMemoryManager::~MonoJITMemoryManager ()
 156 {
 157         delete mm;
 158 }
 159
 160 void
 161 MonoJITMemoryManager::setMemoryWritable (void)
 162 {
 163 }
 164
 165 void
 166 MonoJITMemoryManager::setMemoryExecutable (void)
 167 {
 168 }
 169
 170 void
 171 MonoJITMemoryManager::AllocateGOT()
 172 {
 173         mm->AllocateGOT ();
 174 }
 175
 176 unsigned char *
 177 MonoJITMemoryManager::startFunctionBody(const Function *F,
 178                                         uintptr_t &ActualSize)
 179 {
 180         // FIXME: This leaks memory
 181         if (ActualSize == 0)
 182                 ActualSize = 128;
 183         return alloc_cb (wrap (F), ActualSize);
 184 }
 185
 186 unsigned char *
 187 MonoJITMemoryManager::allocateStub(const GlobalValue* F, unsigned StubSize,
 188                            unsigned Alignment)
 189 {
 190         return alloc_cb (wrap (F), StubSize);
 191 }
 192
 193 void
 194 MonoJITMemoryManager::endFunctionBody(const Function *F, unsigned char *FunctionStart,
 195                                   unsigned char *FunctionEnd)
 196 {
 197 }
 198
 199 unsigned char *
 200 MonoJITMemoryManager::allocateSpace(intptr_t Size, unsigned Alignment)
 201 {
 202         return new unsigned char [Size];
 203 }
 204
 205 uint8_t *
 206 MonoJITMemoryManager::allocateGlobal(uintptr_t Size, unsigned Alignment)
 207 {
 208         return new unsigned char [Size];
 209 }
 210
 211 void
 212 MonoJITMemoryManager::deallocateMemForFunction(const Function *F)
 213 {
 214 }
 215
 216 unsigned char*
 217 MonoJITMemoryManager::startExceptionTable(const Function* F,
 218                                           uintptr_t &ActualSize)
 219 {
 220         return startFunctionBody(F, ActualSize);
 221 }
 222
 223 void
 224 MonoJITMemoryManager::endExceptionTable(const Function *F, unsigned char *TableStart,
 225                                         unsigned char *TableEnd,
 226                                         unsigned char* FrameRegister)
 227 {
 228 }
 229
 230 class MonoJITEventListener : public JITEventListener {
 231
 232 public:
 233         FunctionEmittedCb *emitted_cb;
 234
 235         MonoJITEventListener (FunctionEmittedCb *cb) {
 236                 emitted_cb = cb;
 237         }
 238
 239         virtual void NotifyFunctionEmitted(const Function &F,
 240                                                                            void *Code, size_t Size,
 241                                                                            const EmittedFunctionDetails &Details) {
 242                 /*
 243                  * X86TargetMachine::setCodeModelForJIT() sets the code model to Large on amd64,
 244                  * which means the JIT will generate calls of the form
 245                  * mov reg, <imm>
 246                  * call *reg
 247                  * Our trampoline code can't patch this. Passing CodeModel::Small to createJIT
 248                  * doesn't seem to work, we need Default. A discussion is here:
 249                  * http://lists.cs.uiuc.edu/pipermail/llvmdev/2009-December/027999.html
 250                  * There seems to no way to get the TargeMachine used by an EE either, so we
 251                  * install a profiler hook and reset the code model here.
 252                  * This should be inside an ifdef, but we can't include our config.h either,
 253                  * since its definitions conflict with LLVM's config.h.
 254                  *
 255                  */
 256                 //#if defined(TARGET_X86) || defined(TARGET_AMD64)
 257 #ifndef LLVM_MONO_BRANCH
 258                 /* The LLVM mono branch contains a workaround, so this is not needed */
 259                 if (Details.MF->getTarget ().getCodeModel () == CodeModel::Large) {
 260                         Details.MF->getTarget ().setCodeModel (CodeModel::Default);
 261                 }
 262 #endif
 263                 //#endif
 264
 265                 emitted_cb (wrap (&F), Code, (char*)Code + Size);
 266         }
 267 };
 268
 269 static MonoJITMemoryManager *mono_mm;
 270 static MonoJITEventListener *mono_event_listener;
 271
 272 static FunctionPassManager *fpm;
 273
 274 void
 275 mono_llvm_optimize_method (LLVMValueRef method)
 276 {
 277         verifyFunction (*(unwrap<Function> (method)));
 278         fpm->run (*unwrap<Function> (method));
 279 }
 280
 281 void
 282 mono_llvm_dump_value (LLVMValueRef value)
 283 {
 284         /* Same as LLVMDumpValue (), but print to stdout */
 285         fflush (stdout);
 286         outs () << (*unwrap<Value> (value));
 287 }
 288
 289 /* Missing overload for building an alloca with an alignment */
 290 LLVMValueRef
 291 mono_llvm_build_alloca (LLVMBuilderRef builder, LLVMTypeRef Ty,
 292                                                 LLVMValueRef ArraySize,
 293                                                 int alignment, const char *Name)
 294 {
 295         return wrap (unwrap (builder)->Insert (new AllocaInst (unwrap (Ty), unwrap (ArraySize), alignment), Name));
 296 }
 297
 298 LLVMValueRef
 299 mono_llvm_build_load (LLVMBuilderRef builder, LLVMValueRef PointerVal,
 300                                           const char *Name, gboolean is_volatile)
 301 {
 302         return wrap(unwrap(builder)->CreateLoad(unwrap(PointerVal), is_volatile, Name));
 303 }
 304
 305 LLVMValueRef
 306 mono_llvm_build_aligned_load (LLVMBuilderRef builder, LLVMValueRef PointerVal,
 307                                                           const char *Name, gboolean is_volatile, int alignment)
 308 {
 309         LoadInst *ins;
 310
 311         ins = unwrap(builder)->CreateLoad(unwrap(PointerVal), is_volatile, Name);
 312         ins->setAlignment (alignment);
 313
 314         return wrap(ins);
 315 }
 316
 317 LLVMValueRef
 318 mono_llvm_build_store (LLVMBuilderRef builder, LLVMValueRef Val, LLVMValueRef PointerVal,
 319                                           gboolean is_volatile)
 320 {
 321         return wrap(unwrap(builder)->CreateStore(unwrap(Val), unwrap(PointerVal), is_volatile));
 322 }
 323
 324 LLVMValueRef
 325 mono_llvm_build_aligned_store (LLVMBuilderRef builder, LLVMValueRef Val, LLVMValueRef PointerVal,
 326                                                            gboolean is_volatile, int alignment)
 327 {
 328         StoreInst *ins;
 329
 330         ins = unwrap(builder)->CreateStore(unwrap(Val), unwrap(PointerVal), is_volatile);
 331         ins->setAlignment (alignment);
 332
 333         return wrap (ins);
 334 }
 335
 336 LLVMValueRef
 337 mono_llvm_build_cmpxchg (LLVMBuilderRef builder, LLVMValueRef ptr, LLVMValueRef cmp, LLVMValueRef val)
 338 {
 339         AtomicCmpXchgInst *ins;
 340
 341         ins = unwrap(builder)->CreateAtomicCmpXchg (unwrap(ptr), unwrap (cmp), unwrap (val), SequentiallyConsistent);
 342         return wrap (ins);
 343 }
 344
 345 LLVMValueRef
 346 mono_llvm_build_atomic_rmw (LLVMBuilderRef builder, AtomicRMWOp op, LLVMValueRef ptr, LLVMValueRef val)
 347 {
 348         AtomicRMWInst::BinOp aop = AtomicRMWInst::Xchg;
 349         AtomicRMWInst *ins;
 350
 351         switch (op) {
 352         case LLVM_ATOMICRMW_OP_XCHG:
 353                 aop = AtomicRMWInst::Xchg;
 354                 break;
 355         case LLVM_ATOMICRMW_OP_ADD:
 356                 aop = AtomicRMWInst::Add;
 357                 break;
 358         default:
 359                 g_assert_not_reached ();
 360                 break;
 361         }
 362
 363         ins = unwrap (builder)->CreateAtomicRMW (aop, unwrap (ptr), unwrap (val), AcquireRelease);
 364         return wrap (ins);
 365 }
 366
 367 LLVMValueRef
 368 mono_llvm_build_fence (LLVMBuilderRef builder)
 369 {
 370         FenceInst *ins;
 371
 372         ins = unwrap (builder)->CreateFence (AcquireRelease);
 373         return wrap (ins);
 374 }
 375
 376 void
 377 mono_llvm_replace_uses_of (LLVMValueRef var, LLVMValueRef v)
 378 {
 379         Value *V = ConstantExpr::getTruncOrBitCast (unwrap<Constant> (v), unwrap (var)->getType ());
 380         unwrap (var)->replaceAllUsesWith (V);
 381 }
 382
 383 static cl::list<const PassInfo*, bool, PassNameParser>
 384 PassList(cl::desc("Optimizations available:"));
 385
 386 static void
 387 force_pass_linking (void)
 388 {
 389         // Make sure the rest is linked in, but never executed
 390         if (getenv ("FOO") != (char*)-1)
 391                 return;
 392
 393         // This is a subset of the passes in LinkAllPasses.h
 394         // The utility passes and the interprocedural passes are commented out
 395
 396       (void) llvm::createAAEvalPass();
 397       (void) llvm::createAggressiveDCEPass();
 398       (void) llvm::createAliasAnalysisCounterPass();
 399       (void) llvm::createAliasDebugger();
 400           /*
 401       (void) llvm::createArgumentPromotionPass();
 402       (void) llvm::createStructRetPromotionPass();
 403           */
 404       (void) llvm::createBasicAliasAnalysisPass();
 405       (void) llvm::createLibCallAliasAnalysisPass(0);
 406       (void) llvm::createScalarEvolutionAliasAnalysisPass();
 407       (void) llvm::createBlockPlacementPass();
 408       (void) llvm::createBreakCriticalEdgesPass();
 409       (void) llvm::createCFGSimplificationPass();
 410           /*
 411       (void) llvm::createConstantMergePass();
 412       (void) llvm::createConstantPropagationPass();
 413           */
 414           /*
 415       (void) llvm::createDeadArgEliminationPass();
 416           */
 417       (void) llvm::createDeadCodeEliminationPass();
 418       (void) llvm::createDeadInstEliminationPass();
 419       (void) llvm::createDeadStoreEliminationPass();
 420           /*
 421       (void) llvm::createDeadTypeEliminationPass();
 422       (void) llvm::createDomOnlyPrinterPass();
 423       (void) llvm::createDomPrinterPass();
 424       (void) llvm::createDomOnlyViewerPass();
 425       (void) llvm::createDomViewerPass();
 426       (void) llvm::createEdgeProfilerPass();
 427       (void) llvm::createOptimalEdgeProfilerPass();
 428       (void) llvm::createFunctionInliningPass();
 429       (void) llvm::createAlwaysInlinerPass();
 430       (void) llvm::createGlobalDCEPass();
 431       (void) llvm::createGlobalOptimizerPass();
 432       (void) llvm::createGlobalsModRefPass();
 433       (void) llvm::createIPConstantPropagationPass();
 434       (void) llvm::createIPSCCPPass();
 435           */
 436       (void) llvm::createIndVarSimplifyPass();
 437       (void) llvm::createInstructionCombiningPass();
 438           /*
 439       (void) llvm::createInternalizePass(false);
 440           */
 441       (void) llvm::createLCSSAPass();
 442       (void) llvm::createLICMPass();
 443       (void) llvm::createLazyValueInfoPass();
 444       (void) llvm::createLoopDependenceAnalysisPass();
 445           /*
 446       (void) llvm::createLoopExtractorPass();
 447           */
 448       (void) llvm::createLoopSimplifyPass();
 449       (void) llvm::createLoopStrengthReducePass();
 450       (void) llvm::createLoopUnrollPass();
 451       (void) llvm::createLoopUnswitchPass();
 452       (void) llvm::createLoopRotatePass();
 453       (void) llvm::createLowerInvokePass();
 454           /*
 455       (void) llvm::createLowerSetJmpPass();
 456           */
 457       (void) llvm::createLowerSwitchPass();
 458       (void) llvm::createNoAAPass();
 459           /*
 460       (void) llvm::createNoProfileInfoPass();
 461       (void) llvm::createProfileEstimatorPass();
 462       (void) llvm::createProfileVerifierPass();
 463       (void) llvm::createProfileLoaderPass();
 464           */
 465       (void) llvm::createPromoteMemoryToRegisterPass();
 466       (void) llvm::createDemoteRegisterToMemoryPass();
 467           /*
 468       (void) llvm::createPruneEHPass();
 469       (void) llvm::createPostDomOnlyPrinterPass();
 470       (void) llvm::createPostDomPrinterPass();
 471       (void) llvm::createPostDomOnlyViewerPass();
 472       (void) llvm::createPostDomViewerPass();
 473           */
 474       (void) llvm::createReassociatePass();
 475       (void) llvm::createSCCPPass();
 476       (void) llvm::createScalarReplAggregatesPass();
 477       (void) llvm::createSimplifyLibCallsPass();
 478           /*
 479       (void) llvm::createSingleLoopExtractorPass();
 480       (void) llvm::createStripSymbolsPass();
 481       (void) llvm::createStripNonDebugSymbolsPass();
 482       (void) llvm::createStripDeadDebugInfoPass();
 483       (void) llvm::createStripDeadPrototypesPass();
 484       (void) llvm::createTailCallEliminationPass();
 485       (void) llvm::createTailDuplicationPass();
 486       (void) llvm::createJumpThreadingPass();
 487           */
 488           /*
 489       (void) llvm::createUnifyFunctionExitNodesPass();
 490           */
 491       (void) llvm::createInstCountPass();
 492       (void) llvm::createCodeGenPreparePass();
 493       (void) llvm::createGVNPass();
 494       (void) llvm::createMemCpyOptPass();
 495       (void) llvm::createLoopDeletionPass();
 496           /*
 497       (void) llvm::createPostDomTree();
 498       (void) llvm::createPostDomFrontier();
 499       (void) llvm::createInstructionNamerPass();
 500       (void) llvm::createPartialSpecializationPass();
 501       (void) llvm::createFunctionAttrsPass();
 502       (void) llvm::createMergeFunctionsPass();
 503       (void) llvm::createPrintModulePass(0);
 504       (void) llvm::createPrintFunctionPass("", 0);
 505       (void) llvm::createDbgInfoPrinterPass();
 506       (void) llvm::createModuleDebugInfoPrinterPass();
 507       (void) llvm::createPartialInliningPass();
 508       (void) llvm::createGEPSplitterPass();
 509       (void) llvm::createLintPass();
 510           */
 511       (void) llvm::createSinkingPass();
 512 }
 513
 514 LLVMExecutionEngineRef
 515 mono_llvm_create_ee (LLVMModuleProviderRef MP, AllocCodeMemoryCb *alloc_cb, FunctionEmittedCb *emitted_cb, ExceptionTableCb *exception_cb, DlSymCb *dlsym_cb)
 516 {
 517   std::string Error;
 518
 519   force_pass_linking ();
 520
 521 #ifdef TARGET_ARM
 522   LLVMInitializeARMTarget ();
 523   LLVMInitializeARMTargetInfo ();
 524   LLVMInitializeARMTargetMC ();
 525 #else
 526   LLVMInitializeX86Target ();
 527   LLVMInitializeX86TargetInfo ();
 528   LLVMInitializeX86TargetMC ();
 529 #endif
 530
 531   mono_mm = new MonoJITMemoryManager ();
 532   mono_mm->alloc_cb = alloc_cb;
 533   mono_mm->dlsym_cb = dlsym_cb;
 534
 535   //JITExceptionHandling = true;
 536   // PrettyStackTrace installs signal handlers which trip up libgc
 537   DisablePrettyStackTrace = true;
 538
 539   /*
 540    * The Default code model doesn't seem to work on amd64,
 541    * test_0_fields_with_big_offsets (among others) crashes, because LLVM tries to call
 542    * memset using a normal pcrel code which is in 32bit memory, while memset isn't.
 543    */
 544
 545   TargetOptions opts;
 546   opts.JITExceptionHandling = 1;
 547
 548   EngineBuilder b (unwrap (MP));
 549 #ifdef TARGET_AMD64
 550   ExecutionEngine *EE = b.setJITMemoryManager (mono_mm).setTargetOptions (opts).setCodeModel (CodeModel::Large).setAllocateGVsWithCode (true).create ();
 551 #else
 552   ExecutionEngine *EE = b.setJITMemoryManager (mono_mm).setTargetOptions (opts).setAllocateGVsWithCode (true).create ();
 553 #endif
 554   g_assert (EE);
 555
 556 #if 0
 557   ExecutionEngine *EE = ExecutionEngine::createJIT (unwrap (MP), &Error, mono_mm, CodeGenOpt::Default, true, Reloc::Default, CodeModel::Large);
 558   if (!EE) {
 559           errs () << "Unable to create LLVM ExecutionEngine: " << Error << "\n";
 560           g_assert_not_reached ();
 561   }
 562 #endif
 563
 564   EE->InstallExceptionTableRegister (exception_cb);
 565   mono_event_listener = new MonoJITEventListener (emitted_cb);
 566   EE->RegisterJITEventListener (mono_event_listener);
 567
 568   fpm = new FunctionPassManager (unwrap (MP));
 569
 570   fpm->add(new TargetData(*EE->getTargetData()));
 571
 572   PassRegistry &Registry = *PassRegistry::getPassRegistry();
 573   initializeCore(Registry);
 574   initializeScalarOpts(Registry);
 575   //initializeIPO(Registry);
 576   initializeAnalysis(Registry);
 577   initializeIPA(Registry);
 578   initializeTransformUtils(Registry);
 579   initializeInstCombine(Registry);
 580   //initializeInstrumentation(Registry);
 581   initializeTarget(Registry);
 582
 583   llvm::cl::ParseEnvironmentOptions("mono", "MONO_LLVM", "", false);
 584
 585   if (PassList.size() > 0) {
 586           /* Use the passes specified by the env variable */
 587           /* Only the passes in force_pass_linking () can be used */
 588           for (unsigned i = 0; i < PassList.size(); ++i) {
 589                   const PassInfo *PassInf = PassList[i];
 590                   Pass *P = 0;
 591
 592                   if (PassInf->getNormalCtor())
 593                           P = PassInf->getNormalCtor()();
 594                   fpm->add (P);
 595           }
 596   } else {
 597           /* Use the same passes used by 'opt' by default, without the ipo passes */
 598           const char *opts = "-simplifycfg -domtree -domfrontier -scalarrepl -instcombine -simplifycfg -basiccg -domtree -domfrontier -scalarrepl -simplify-libcalls -instcombine -simplifycfg -instcombine -simplifycfg -reassociate -domtree -loops -loop-simplify -domfrontier -loop-simplify -lcssa -loop-rotate -licm -lcssa -loop-unswitch -instcombine -scalar-evolution -loop-simplify -lcssa -iv-users -indvars -loop-deletion -loop-simplify -lcssa -loop-unroll -instcombine -memdep -gvn -memdep -memcpyopt -sccp -instcombine -domtree -memdep -dse -adce -gvn -simplifycfg -preverify -domtree -verify";
 599           char **args;
 600           int i;
 601
 602           args = g_strsplit (opts, " ", 1000);
 603           for (i = 0; args [i]; i++)
 604                   ;
 605           llvm::cl::ParseCommandLineOptions (i, args, "", false);
 606           g_strfreev (args);
 607
 608           for (unsigned i = 0; i < PassList.size(); ++i) {
 609                   const PassInfo *PassInf = PassList[i];
 610                   Pass *P = 0;
 611
 612                   if (PassInf->getNormalCtor())
 613                           P = PassInf->getNormalCtor()();
 614                   fpm->add (P);
 615           }
 616
 617           /*
 618           fpm->add(createInstructionCombiningPass());
 619           fpm->add(createReassociatePass());
 620           fpm->add(createGVNPass());
 621           fpm->add(createCFGSimplificationPass());
 622           */
 623   }
 624
 625   return wrap(EE);
 626 }
 627
 628 void
 629 mono_llvm_dispose_ee (LLVMExecutionEngineRef ee)
 630 {
 631         delete unwrap (ee);
 632
 633         delete fpm;
 634 }