1 //===- ExecutionEngine.h - Abstract Execution Engine Interface --*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the abstract interface that implements execution support
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_EXECUTIONENGINE_EXECUTIONENGINE_H
16 #define LLVM_EXECUTIONENGINE_EXECUTIONENGINE_H
18 #include "llvm-c/ExecutionEngine.h"
19 #include "llvm/ADT/SmallVector.h"
20 #include "llvm/ADT/StringRef.h"
21 #include "llvm/IR/ValueHandle.h"
22 #include "llvm/IR/ValueMap.h"
23 #include "llvm/MC/MCCodeGenInfo.h"
24 #include "llvm/Support/ErrorHandling.h"
25 #include "llvm/Support/Mutex.h"
26 #include "llvm/Target/TargetMachine.h"
27 #include "llvm/Target/TargetOptions.h"
37 class ExecutionEngine;
41 class JITEventListener;
42 class JITMemoryManager;
43 class MachineCodeInfo;
47 class RTDyldMemoryManager;
56 /// \brief Helper class for helping synchronize access to the global address map
58 class ExecutionEngineState {
60 struct AddressMapConfig : public ValueMapConfig<const GlobalValue*> {
61 typedef ExecutionEngineState *ExtraData;
62 static sys::Mutex *getMutex(ExecutionEngineState *EES);
63 static void onDelete(ExecutionEngineState *EES, const GlobalValue *Old);
64 static void onRAUW(ExecutionEngineState *, const GlobalValue *,
68 typedef ValueMap<const GlobalValue *, void *, AddressMapConfig>
74 /// GlobalAddressMap - A mapping between LLVM global values and their
75 /// actualized version...
76 GlobalAddressMapTy GlobalAddressMap;
78 /// GlobalAddressReverseMap - This is the reverse mapping of GlobalAddressMap,
79 /// used to convert raw addresses into the LLVM global value that is emitted
80 /// at the address. This map is not computed unless getGlobalValueAtAddress
81 /// is called at some point.
82 std::map<void *, AssertingVH<const GlobalValue> > GlobalAddressReverseMap;
85 ExecutionEngineState(ExecutionEngine &EE);
87 GlobalAddressMapTy &getGlobalAddressMap(const MutexGuard &) {
88 return GlobalAddressMap;
91 std::map<void*, AssertingVH<const GlobalValue> > &
92 getGlobalAddressReverseMap(const MutexGuard &) {
93 return GlobalAddressReverseMap;
96 /// \brief Erase an entry from the mapping table.
98 /// \returns The address that \p ToUnmap was happed to.
99 void *RemoveMapping(const MutexGuard &, const GlobalValue *ToUnmap);
102 /// \brief Abstract interface for implementation execution of LLVM modules,
103 /// designed to support both interpreter and just-in-time (JIT) compiler
105 class ExecutionEngine {
106 /// The state object holding the global address mapping, which must be
107 /// accessed synchronously.
109 // FIXME: There is no particular need the entire map needs to be
110 // synchronized. Wouldn't a reader-writer design be better here?
111 ExecutionEngineState EEState;
113 /// The target data for the platform for which execution is being performed.
114 const DataLayout *DL;
116 /// Whether lazy JIT compilation is enabled.
117 bool CompilingLazily;
119 /// Whether JIT compilation of external global variables is allowed.
120 bool GVCompilationDisabled;
122 /// Whether the JIT should perform lookups of external symbols (e.g.,
124 bool SymbolSearchingDisabled;
126 /// Whether the JIT should verify IR modules during compilation.
129 friend class EngineBuilder; // To allow access to JITCtor and InterpCtor.
132 /// The list of Modules that we are JIT'ing from. We use a SmallVector to
133 /// optimize for the case where there is only one module.
134 SmallVector<Module*, 1> Modules;
136 void setDataLayout(const DataLayout *Val) { DL = Val; }
138 /// getMemoryforGV - Allocate memory for a global variable.
139 virtual char *getMemoryForGV(const GlobalVariable *GV);
141 // To avoid having libexecutionengine depend on the JIT and interpreter
142 // libraries, the execution engine implementations set these functions to ctor
143 // pointers at startup time if they are linked in.
144 static ExecutionEngine *(*JITCtor)(
146 std::string *ErrorStr,
147 JITMemoryManager *JMM,
150 static ExecutionEngine *(*MCJITCtor)(
152 std::string *ErrorStr,
153 RTDyldMemoryManager *MCJMM,
156 static ExecutionEngine *(*InterpCtor)(Module *M, std::string *ErrorStr);
158 /// LazyFunctionCreator - If an unknown function is needed, this function
159 /// pointer is invoked to create it. If this returns null, the JIT will
161 void *(*LazyFunctionCreator)(const std::string &);
164 /// lock - This lock protects the ExecutionEngine, MCJIT, JIT, JITResolver and
165 /// JITEmitter classes. It must be held while changing the internal state of
166 /// any of those classes.
169 //===--------------------------------------------------------------------===//
170 // ExecutionEngine Startup
171 //===--------------------------------------------------------------------===//
173 virtual ~ExecutionEngine();
175 /// create - This is the factory method for creating an execution engine which
176 /// is appropriate for the current machine. This takes ownership of the
179 /// \param GVsWithCode - Allocating globals with code breaks
180 /// freeMachineCodeForFunction and is probably unsafe and bad for performance.
181 /// However, we have clients who depend on this behavior, so we must support
182 /// it. Eventually, when we're willing to break some backwards compatibility,
183 /// this flag should be flipped to false, so that by default
184 /// freeMachineCodeForFunction works.
185 static ExecutionEngine *create(Module *M,
186 bool ForceInterpreter = false,
187 std::string *ErrorStr = nullptr,
188 CodeGenOpt::Level OptLevel =
190 bool GVsWithCode = true);
192 /// createJIT - This is the factory method for creating a JIT for the current
193 /// machine, it does not fall back to the interpreter. This takes ownership
194 /// of the Module and JITMemoryManager if successful.
196 /// Clients should make sure to initialize targets prior to calling this
198 static ExecutionEngine *createJIT(Module *M,
199 std::string *ErrorStr = nullptr,
200 JITMemoryManager *JMM = nullptr,
201 CodeGenOpt::Level OptLevel =
203 bool GVsWithCode = true,
204 Reloc::Model RM = Reloc::Default,
205 CodeModel::Model CMM =
206 CodeModel::JITDefault);
208 /// addModule - Add a Module to the list of modules that we can JIT from.
209 /// Note that this takes ownership of the Module: when the ExecutionEngine is
210 /// destroyed, it destroys the Module as well.
211 virtual void addModule(Module *M) {
212 Modules.push_back(M);
215 /// addObjectFile - Add an ObjectFile to the execution engine.
217 /// This method is only supported by MCJIT. MCJIT will immediately load the
218 /// object into memory and adds its symbols to the list used to resolve
219 /// external symbols while preparing other objects for execution.
221 /// Objects added using this function will not be made executable until
222 /// needed by another object.
224 /// MCJIT will take ownership of the ObjectFile.
225 virtual void addObjectFile(std::unique_ptr<object::ObjectFile> O) {
227 "ExecutionEngine subclass doesn't implement addObjectFile.");
230 /// addArchive - Add an Archive to the execution engine.
232 /// This method is only supported by MCJIT. MCJIT will use the archive to
233 /// resolve external symbols in objects it is loading. If a symbol is found
234 /// in the Archive the contained object file will be extracted (in memory)
235 /// and loaded for possible execution.
237 /// MCJIT will take ownership of the Archive.
238 virtual void addArchive(object::Archive *A) {
239 llvm_unreachable("ExecutionEngine subclass doesn't implement addArchive.");
242 //===--------------------------------------------------------------------===//
244 const DataLayout *getDataLayout() const { return DL; }
246 /// removeModule - Remove a Module from the list of modules. Returns true if
248 virtual bool removeModule(Module *M);
250 /// FindFunctionNamed - Search all of the active modules to find the one that
251 /// defines FnName. This is very slow operation and shouldn't be used for
253 virtual Function *FindFunctionNamed(const char *FnName);
255 /// runFunction - Execute the specified function with the specified arguments,
256 /// and return the result.
257 virtual GenericValue runFunction(Function *F,
258 const std::vector<GenericValue> &ArgValues) = 0;
260 /// getPointerToNamedFunction - This method returns the address of the
261 /// specified function by using the dlsym function call. As such it is only
262 /// useful for resolving library symbols, not code generated symbols.
264 /// If AbortOnFailure is false and no function with the given name is
265 /// found, this function silently returns a null pointer. Otherwise,
266 /// it prints a message to stderr and aborts.
268 /// This function is deprecated for the MCJIT execution engine.
270 /// FIXME: the JIT and MCJIT interfaces should be disentangled or united
271 /// again, if possible.
273 virtual void *getPointerToNamedFunction(const std::string &Name,
274 bool AbortOnFailure = true) = 0;
276 /// mapSectionAddress - map a section to its target address space value.
277 /// Map the address of a JIT section as returned from the memory manager
278 /// to the address in the target process as the running code will see it.
279 /// This is the address which will be used for relocation resolution.
280 virtual void mapSectionAddress(const void *LocalAddress, uint64_t TargetAddress) {
281 llvm_unreachable("Re-mapping of section addresses not supported with this "
285 /// generateCodeForModule - Run code generationen for the specified module and
286 /// load it into memory.
288 /// When this function has completed, all code and data for the specified
289 /// module, and any module on which this module depends, will be generated
290 /// and loaded into memory, but relocations will not yet have been applied
291 /// and all memory will be readable and writable but not executable.
293 /// This function is primarily useful when generating code for an external
294 /// target, allowing the client an opportunity to remap section addresses
295 /// before relocations are applied. Clients that intend to execute code
296 /// locally can use the getFunctionAddress call, which will generate code
297 /// and apply final preparations all in one step.
299 /// This method has no effect for the legacy JIT engine or the interpeter.
300 virtual void generateCodeForModule(Module *M) {}
302 /// finalizeObject - ensure the module is fully processed and is usable.
304 /// It is the user-level function for completing the process of making the
305 /// object usable for execution. It should be called after sections within an
306 /// object have been relocated using mapSectionAddress. When this method is
307 /// called the MCJIT execution engine will reapply relocations for a loaded
308 /// object. This method has no effect for the legacy JIT engine or the
310 virtual void finalizeObject() {}
312 /// runStaticConstructorsDestructors - This method is used to execute all of
313 /// the static constructors or destructors for a program.
315 /// \param isDtors - Run the destructors instead of constructors.
316 virtual void runStaticConstructorsDestructors(bool isDtors);
318 /// runStaticConstructorsDestructors - This method is used to execute all of
319 /// the static constructors or destructors for a particular module.
321 /// \param isDtors - Run the destructors instead of constructors.
322 void runStaticConstructorsDestructors(Module *module, bool isDtors);
325 /// runFunctionAsMain - This is a helper function which wraps runFunction to
326 /// handle the common task of starting up main with the specified argc, argv,
327 /// and envp parameters.
328 int runFunctionAsMain(Function *Fn, const std::vector<std::string> &argv,
329 const char * const * envp);
332 /// addGlobalMapping - Tell the execution engine that the specified global is
333 /// at the specified location. This is used internally as functions are JIT'd
334 /// and as global variables are laid out in memory. It can and should also be
335 /// used by clients of the EE that want to have an LLVM global overlay
336 /// existing data in memory. Mappings are automatically removed when their
337 /// GlobalValue is destroyed.
338 void addGlobalMapping(const GlobalValue *GV, void *Addr);
340 /// clearAllGlobalMappings - Clear all global mappings and start over again,
341 /// for use in dynamic compilation scenarios to move globals.
342 void clearAllGlobalMappings();
344 /// clearGlobalMappingsFromModule - Clear all global mappings that came from a
345 /// particular module, because it has been removed from the JIT.
346 void clearGlobalMappingsFromModule(Module *M);
348 /// updateGlobalMapping - Replace an existing mapping for GV with a new
349 /// address. This updates both maps as required. If "Addr" is null, the
350 /// entry for the global is removed from the mappings. This returns the old
351 /// value of the pointer, or null if it was not in the map.
352 void *updateGlobalMapping(const GlobalValue *GV, void *Addr);
354 /// getPointerToGlobalIfAvailable - This returns the address of the specified
355 /// global value if it is has already been codegen'd, otherwise it returns
358 /// This function is deprecated for the MCJIT execution engine. It doesn't
359 /// seem to be needed in that case, but an equivalent can be added if it is.
360 void *getPointerToGlobalIfAvailable(const GlobalValue *GV);
362 /// getPointerToGlobal - This returns the address of the specified global
363 /// value. This may involve code generation if it's a function.
365 /// This function is deprecated for the MCJIT execution engine. Use
366 /// getGlobalValueAddress instead.
367 void *getPointerToGlobal(const GlobalValue *GV);
369 /// getPointerToFunction - The different EE's represent function bodies in
370 /// different ways. They should each implement this to say what a function
371 /// pointer should look like. When F is destroyed, the ExecutionEngine will
372 /// remove its global mapping and free any machine code. Be sure no threads
373 /// are running inside F when that happens.
375 /// This function is deprecated for the MCJIT execution engine. Use
376 /// getFunctionAddress instead.
377 virtual void *getPointerToFunction(Function *F) = 0;
379 /// getPointerToBasicBlock - The different EE's represent basic blocks in
380 /// different ways. Return the representation for a blockaddress of the
383 /// This function will not be implemented for the MCJIT execution engine.
384 virtual void *getPointerToBasicBlock(BasicBlock *BB) = 0;
386 /// getPointerToFunctionOrStub - If the specified function has been
387 /// code-gen'd, return a pointer to the function. If not, compile it, or use
388 /// a stub to implement lazy compilation if available. See
389 /// getPointerToFunction for the requirements on destroying F.
391 /// This function is deprecated for the MCJIT execution engine. Use
392 /// getFunctionAddress instead.
393 virtual void *getPointerToFunctionOrStub(Function *F) {
394 // Default implementation, just codegen the function.
395 return getPointerToFunction(F);
398 /// getGlobalValueAddress - Return the address of the specified global
399 /// value. This may involve code generation.
401 /// This function should not be called with the JIT or interpreter engines.
402 virtual uint64_t getGlobalValueAddress(const std::string &Name) {
403 // Default implementation for JIT and interpreter. MCJIT will override this.
404 // JIT and interpreter clients should use getPointerToGlobal instead.
408 /// getFunctionAddress - Return the address of the specified function.
409 /// This may involve code generation.
410 virtual uint64_t getFunctionAddress(const std::string &Name) {
411 // Default implementation for JIT and interpreter. MCJIT will override this.
412 // JIT and interpreter clients should use getPointerToFunction instead.
416 // The JIT overrides a version that actually does this.
417 virtual void runJITOnFunction(Function *, MachineCodeInfo * = nullptr) { }
419 /// getGlobalValueAtAddress - Return the LLVM global value object that starts
420 /// at the specified address.
422 const GlobalValue *getGlobalValueAtAddress(void *Addr);
424 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr.
425 /// Ptr is the address of the memory at which to store Val, cast to
426 /// GenericValue *. It is not a pointer to a GenericValue containing the
427 /// address at which to store Val.
428 void StoreValueToMemory(const GenericValue &Val, GenericValue *Ptr,
431 void InitializeMemory(const Constant *Init, void *Addr);
433 /// recompileAndRelinkFunction - This method is used to force a function which
434 /// has already been compiled to be compiled again, possibly after it has been
435 /// modified. Then the entry to the old copy is overwritten with a branch to
436 /// the new copy. If there was no old copy, this acts just like
437 /// VM::getPointerToFunction().
438 virtual void *recompileAndRelinkFunction(Function *F) = 0;
440 /// freeMachineCodeForFunction - Release memory in the ExecutionEngine
441 /// corresponding to the machine code emitted to execute this function, useful
442 /// for garbage-collecting generated code.
443 virtual void freeMachineCodeForFunction(Function *F) = 0;
445 /// getOrEmitGlobalVariable - Return the address of the specified global
446 /// variable, possibly emitting it to memory if needed. This is used by the
449 /// This function is deprecated for the MCJIT execution engine. Use
450 /// getGlobalValueAddress instead.
451 virtual void *getOrEmitGlobalVariable(const GlobalVariable *GV) {
452 return getPointerToGlobal((const GlobalValue *)GV);
455 /// Registers a listener to be called back on various events within
456 /// the JIT. See JITEventListener.h for more details. Does not
457 /// take ownership of the argument. The argument may be NULL, in
458 /// which case these functions do nothing.
459 virtual void RegisterJITEventListener(JITEventListener *) {}
460 virtual void UnregisterJITEventListener(JITEventListener *) {}
462 /// Sets the pre-compiled object cache. The ownership of the ObjectCache is
463 /// not changed. Supported by MCJIT but not JIT.
464 virtual void setObjectCache(ObjectCache *) {
465 llvm_unreachable("No support for an object cache");
468 /// setProcessAllSections (MCJIT Only): By default, only sections that are
469 /// "required for execution" are passed to the RTDyldMemoryManager, and other
470 /// sections are discarded. Passing 'true' to this method will cause
471 /// RuntimeDyld to pass all sections to its RTDyldMemoryManager regardless
472 /// of whether they are "required to execute" in the usual sense.
474 /// Rationale: Some MCJIT clients want to be able to inspect metadata
475 /// sections (e.g. Dwarf, Stack-maps) to enable functionality or analyze
476 /// performance. Passing these sections to the memory manager allows the
477 /// client to make policy about the relevant sections, rather than having
479 virtual void setProcessAllSections(bool ProcessAllSections) {
480 llvm_unreachable("No support for ProcessAllSections option");
483 /// Return the target machine (if available).
484 virtual TargetMachine *getTargetMachine() { return nullptr; }
486 /// DisableLazyCompilation - When lazy compilation is off (the default), the
487 /// JIT will eagerly compile every function reachable from the argument to
488 /// getPointerToFunction. If lazy compilation is turned on, the JIT will only
489 /// compile the one function and emit stubs to compile the rest when they're
490 /// first called. If lazy compilation is turned off again while some lazy
491 /// stubs are still around, and one of those stubs is called, the program will
494 /// In order to safely compile lazily in a threaded program, the user must
495 /// ensure that 1) only one thread at a time can call any particular lazy
496 /// stub, and 2) any thread modifying LLVM IR must hold the JIT's lock
497 /// (ExecutionEngine::lock) or otherwise ensure that no other thread calls a
498 /// lazy stub. See http://llvm.org/PR5184 for details.
499 void DisableLazyCompilation(bool Disabled = true) {
500 CompilingLazily = !Disabled;
502 bool isCompilingLazily() const {
503 return CompilingLazily;
505 // Deprecated in favor of isCompilingLazily (to reduce double-negatives).
506 // Remove this in LLVM 2.8.
507 bool isLazyCompilationDisabled() const {
508 return !CompilingLazily;
511 /// DisableGVCompilation - If called, the JIT will abort if it's asked to
512 /// allocate space and populate a GlobalVariable that is not internal to
514 void DisableGVCompilation(bool Disabled = true) {
515 GVCompilationDisabled = Disabled;
517 bool isGVCompilationDisabled() const {
518 return GVCompilationDisabled;
521 /// DisableSymbolSearching - If called, the JIT will not try to lookup unknown
522 /// symbols with dlsym. A client can still use InstallLazyFunctionCreator to
523 /// resolve symbols in a custom way.
524 void DisableSymbolSearching(bool Disabled = true) {
525 SymbolSearchingDisabled = Disabled;
527 bool isSymbolSearchingDisabled() const {
528 return SymbolSearchingDisabled;
531 /// Enable/Disable IR module verification.
533 /// Note: Module verification is enabled by default in Debug builds, and
534 /// disabled by default in Release. Use this method to override the default.
535 void setVerifyModules(bool Verify) {
536 VerifyModules = Verify;
538 bool getVerifyModules() const {
539 return VerifyModules;
542 /// InstallLazyFunctionCreator - If an unknown function is needed, the
543 /// specified function pointer is invoked to create it. If it returns null,
544 /// the JIT will abort.
545 void InstallLazyFunctionCreator(void* (*P)(const std::string &)) {
546 LazyFunctionCreator = P;
550 explicit ExecutionEngine(Module *M);
554 void EmitGlobalVariable(const GlobalVariable *GV);
556 GenericValue getConstantValue(const Constant *C);
557 void LoadValueFromMemory(GenericValue &Result, GenericValue *Ptr,
561 namespace EngineKind {
562 // These are actually bitmasks that get or-ed together.
567 const static Kind Either = (Kind)(JIT | Interpreter);
570 /// EngineBuilder - Builder class for ExecutionEngines. Use this by
571 /// stack-allocating a builder, chaining the various set* methods, and
572 /// terminating it with a .create() call.
573 class EngineBuilder {
576 EngineKind::Kind WhichEngine;
577 std::string *ErrorStr;
578 CodeGenOpt::Level OptLevel;
579 RTDyldMemoryManager *MCJMM;
580 JITMemoryManager *JMM;
581 bool AllocateGVsWithCode;
582 TargetOptions Options;
583 Reloc::Model RelocModel;
584 CodeModel::Model CMModel;
587 SmallVector<std::string, 4> MAttrs;
591 /// InitEngine - Does the common initialization of default options.
593 WhichEngine = EngineKind::Either;
595 OptLevel = CodeGenOpt::Default;
598 Options = TargetOptions();
599 AllocateGVsWithCode = false;
600 RelocModel = Reloc::Default;
601 CMModel = CodeModel::JITDefault;
604 // IR module verification is enabled by default in debug builds, and disabled
605 // by default in release builds.
607 VerifyModules = true;
609 VerifyModules = false;
614 /// EngineBuilder - Constructor for EngineBuilder. If create() is called and
615 /// is successful, the created engine takes ownership of the module.
616 EngineBuilder(Module *m) : M(m) {
620 /// setEngineKind - Controls whether the user wants the interpreter, the JIT,
621 /// or whichever engine works. This option defaults to EngineKind::Either.
622 EngineBuilder &setEngineKind(EngineKind::Kind w) {
627 /// setMCJITMemoryManager - Sets the MCJIT memory manager to use. This allows
628 /// clients to customize their memory allocation policies for the MCJIT. This
629 /// is only appropriate for the MCJIT; setting this and configuring the builder
630 /// to create anything other than MCJIT will cause a runtime error. If create()
631 /// is called and is successful, the created engine takes ownership of the
632 /// memory manager. This option defaults to NULL. Using this option nullifies
633 /// the setJITMemoryManager() option.
634 EngineBuilder &setMCJITMemoryManager(RTDyldMemoryManager *mcjmm) {
640 /// setJITMemoryManager - Sets the JIT memory manager to use. This allows
641 /// clients to customize their memory allocation policies. This is only
642 /// appropriate for either JIT or MCJIT; setting this and configuring the
643 /// builder to create an interpreter will cause a runtime error. If create()
644 /// is called and is successful, the created engine takes ownership of the
645 /// memory manager. This option defaults to NULL. This option overrides
646 /// setMCJITMemoryManager() as well.
647 EngineBuilder &setJITMemoryManager(JITMemoryManager *jmm) {
653 /// setErrorStr - Set the error string to write to on error. This option
654 /// defaults to NULL.
655 EngineBuilder &setErrorStr(std::string *e) {
660 /// setOptLevel - Set the optimization level for the JIT. This option
661 /// defaults to CodeGenOpt::Default.
662 EngineBuilder &setOptLevel(CodeGenOpt::Level l) {
667 /// setTargetOptions - Set the target options that the ExecutionEngine
668 /// target is using. Defaults to TargetOptions().
669 EngineBuilder &setTargetOptions(const TargetOptions &Opts) {
674 /// setRelocationModel - Set the relocation model that the ExecutionEngine
675 /// target is using. Defaults to target specific default "Reloc::Default".
676 EngineBuilder &setRelocationModel(Reloc::Model RM) {
681 /// setCodeModel - Set the CodeModel that the ExecutionEngine target
682 /// data is using. Defaults to target specific default
683 /// "CodeModel::JITDefault".
684 EngineBuilder &setCodeModel(CodeModel::Model M) {
689 /// setAllocateGVsWithCode - Sets whether global values should be allocated
690 /// into the same buffer as code. For most applications this should be set
691 /// to false. Allocating globals with code breaks freeMachineCodeForFunction
692 /// and is probably unsafe and bad for performance. However, we have clients
693 /// who depend on this behavior, so we must support it. This option defaults
694 /// to false so that users of the new API can safely use the new memory
695 /// manager and free machine code.
696 EngineBuilder &setAllocateGVsWithCode(bool a) {
697 AllocateGVsWithCode = a;
701 /// setMArch - Override the architecture set by the Module's triple.
702 EngineBuilder &setMArch(StringRef march) {
703 MArch.assign(march.begin(), march.end());
707 /// setMCPU - Target a specific cpu type.
708 EngineBuilder &setMCPU(StringRef mcpu) {
709 MCPU.assign(mcpu.begin(), mcpu.end());
713 /// setUseMCJIT - Set whether the MC-JIT implementation should be used
715 EngineBuilder &setUseMCJIT(bool Value) {
720 /// setVerifyModules - Set whether the JIT implementation should verify
721 /// IR modules during compilation.
722 EngineBuilder &setVerifyModules(bool Verify) {
723 VerifyModules = Verify;
727 /// setMAttrs - Set cpu-specific attributes.
728 template<typename StringSequence>
729 EngineBuilder &setMAttrs(const StringSequence &mattrs) {
731 MAttrs.append(mattrs.begin(), mattrs.end());
735 TargetMachine *selectTarget();
737 /// selectTarget - Pick a target either via -march or by guessing the native
738 /// arch. Add any CPU features specified via -mcpu or -mattr.
739 TargetMachine *selectTarget(const Triple &TargetTriple,
742 const SmallVectorImpl<std::string>& MAttrs);
744 ExecutionEngine *create() {
745 return create(selectTarget());
748 ExecutionEngine *create(TargetMachine *TM);
751 // Create wrappers for C Binding types (see CBindingWrapping.h).
752 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(ExecutionEngine, LLVMExecutionEngineRef)
754 } // End llvm namespace