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This patch fixes MCJIT::addGlobalMapping by changing the implementation of the ExecutionEngineState class. The new implementation maintains a bidirectional mapping between symbol names (std::strings) and addresses (uint64_ts), rather than a mapping between Value*s and void*s. This has fix has been made for backwards compatibility, however the strongly preferred way to resolve unknown symbols is by writing a custom RuntimeDyld::SymbolResolver (formerly RTDyldMemoryManager) and overriding the findSymbol method. The addGlobalMapping method is a hangover from the legacy JIT (which has was removed in 3.6), and may be deprecated in a future release as part of a clean-up of the ExecutionEngine interface. Patch by Murat Bolat. Thanks Murat! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233747 91177308-0d34-0410-b5e6-96231b3b80d8
635 lines
24 KiB
C++
635 lines
24 KiB
C++
//===- ExecutionEngine.h - Abstract Execution Engine Interface --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the abstract interface that implements execution support
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// for LLVM.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_EXECUTIONENGINE_EXECUTIONENGINE_H
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#define LLVM_EXECUTIONENGINE_EXECUTIONENGINE_H
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#include "RuntimeDyld.h"
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#include "llvm-c/ExecutionEngine.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/ValueHandle.h"
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#include "llvm/IR/ValueMap.h"
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#include "llvm/MC/MCCodeGenInfo.h"
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#include "llvm/Object/Binary.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/Mutex.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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#include <map>
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#include <string>
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#include <vector>
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namespace llvm {
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struct GenericValue;
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class Constant;
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class DataLayout;
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class ExecutionEngine;
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class Function;
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class GlobalVariable;
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class GlobalValue;
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class JITEventListener;
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class MachineCodeInfo;
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class MCJITMemoryManager;
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class MutexGuard;
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class ObjectCache;
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class RTDyldMemoryManager;
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class Triple;
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class Type;
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namespace object {
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class Archive;
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class ObjectFile;
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}
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/// \brief Helper class for helping synchronize access to the global address map
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/// table. Access to this class should be serialized under a mutex.
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class ExecutionEngineState {
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public:
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typedef StringMap<uint64_t> GlobalAddressMapTy;
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private:
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/// GlobalAddressMap - A mapping between LLVM global symbol names values and
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/// their actualized version...
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GlobalAddressMapTy GlobalAddressMap;
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/// GlobalAddressReverseMap - This is the reverse mapping of GlobalAddressMap,
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/// used to convert raw addresses into the LLVM global value that is emitted
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/// at the address. This map is not computed unless getGlobalValueAtAddress
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/// is called at some point.
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std::map<uint64_t, std::string> GlobalAddressReverseMap;
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public:
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GlobalAddressMapTy &getGlobalAddressMap() {
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return GlobalAddressMap;
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}
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std::map<uint64_t, std::string> &getGlobalAddressReverseMap() {
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return GlobalAddressReverseMap;
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}
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/// \brief Erase an entry from the mapping table.
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///
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/// \returns The address that \p ToUnmap was happed to.
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uint64_t RemoveMapping(StringRef Name);
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};
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/// \brief Abstract interface for implementation execution of LLVM modules,
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/// designed to support both interpreter and just-in-time (JIT) compiler
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/// implementations.
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class ExecutionEngine {
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/// The state object holding the global address mapping, which must be
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/// accessed synchronously.
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//
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// FIXME: There is no particular need the entire map needs to be
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// synchronized. Wouldn't a reader-writer design be better here?
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ExecutionEngineState EEState;
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/// The target data for the platform for which execution is being performed.
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const DataLayout *DL;
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/// Whether lazy JIT compilation is enabled.
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bool CompilingLazily;
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/// Whether JIT compilation of external global variables is allowed.
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bool GVCompilationDisabled;
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/// Whether the JIT should perform lookups of external symbols (e.g.,
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/// using dlsym).
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bool SymbolSearchingDisabled;
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/// Whether the JIT should verify IR modules during compilation.
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bool VerifyModules;
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friend class EngineBuilder; // To allow access to JITCtor and InterpCtor.
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protected:
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/// The list of Modules that we are JIT'ing from. We use a SmallVector to
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/// optimize for the case where there is only one module.
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SmallVector<std::unique_ptr<Module>, 1> Modules;
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void setDataLayout(const DataLayout *Val) { DL = Val; }
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/// getMemoryforGV - Allocate memory for a global variable.
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virtual char *getMemoryForGV(const GlobalVariable *GV);
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static ExecutionEngine *(*MCJITCtor)(
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std::unique_ptr<Module> M,
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std::string *ErrorStr,
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std::shared_ptr<MCJITMemoryManager> MM,
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std::shared_ptr<RuntimeDyld::SymbolResolver> SR,
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std::unique_ptr<TargetMachine> TM);
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static ExecutionEngine *(*OrcMCJITReplacementCtor)(
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std::string *ErrorStr,
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std::shared_ptr<MCJITMemoryManager> MM,
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std::shared_ptr<RuntimeDyld::SymbolResolver> SR,
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std::unique_ptr<TargetMachine> TM);
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static ExecutionEngine *(*InterpCtor)(std::unique_ptr<Module> M,
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std::string *ErrorStr);
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/// LazyFunctionCreator - If an unknown function is needed, this function
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/// pointer is invoked to create it. If this returns null, the JIT will
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/// abort.
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void *(*LazyFunctionCreator)(const std::string &);
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/// getMangledName - Get mangled name.
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std::string getMangledName(const GlobalValue *GV);
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public:
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/// lock - This lock protects the ExecutionEngine and MCJIT classes. It must
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/// be held while changing the internal state of any of those classes.
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sys::Mutex lock;
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//===--------------------------------------------------------------------===//
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// ExecutionEngine Startup
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//===--------------------------------------------------------------------===//
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virtual ~ExecutionEngine();
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/// Add a Module to the list of modules that we can JIT from.
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virtual void addModule(std::unique_ptr<Module> M) {
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Modules.push_back(std::move(M));
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}
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/// addObjectFile - Add an ObjectFile to the execution engine.
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///
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/// This method is only supported by MCJIT. MCJIT will immediately load the
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/// object into memory and adds its symbols to the list used to resolve
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/// external symbols while preparing other objects for execution.
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///
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/// Objects added using this function will not be made executable until
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/// needed by another object.
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///
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/// MCJIT will take ownership of the ObjectFile.
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virtual void addObjectFile(std::unique_ptr<object::ObjectFile> O);
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virtual void addObjectFile(object::OwningBinary<object::ObjectFile> O);
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/// addArchive - Add an Archive to the execution engine.
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///
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/// This method is only supported by MCJIT. MCJIT will use the archive to
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/// resolve external symbols in objects it is loading. If a symbol is found
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/// in the Archive the contained object file will be extracted (in memory)
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/// and loaded for possible execution.
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virtual void addArchive(object::OwningBinary<object::Archive> A);
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//===--------------------------------------------------------------------===//
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const DataLayout *getDataLayout() const { return DL; }
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/// removeModule - Remove a Module from the list of modules. Returns true if
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/// M is found.
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virtual bool removeModule(Module *M);
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/// FindFunctionNamed - Search all of the active modules to find the one that
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/// defines FnName. This is very slow operation and shouldn't be used for
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/// general code.
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virtual Function *FindFunctionNamed(const char *FnName);
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/// runFunction - Execute the specified function with the specified arguments,
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/// and return the result.
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virtual GenericValue runFunction(Function *F,
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const std::vector<GenericValue> &ArgValues) = 0;
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/// getPointerToNamedFunction - This method returns the address of the
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/// specified function by using the dlsym function call. As such it is only
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/// useful for resolving library symbols, not code generated symbols.
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///
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/// If AbortOnFailure is false and no function with the given name is
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/// found, this function silently returns a null pointer. Otherwise,
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/// it prints a message to stderr and aborts.
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///
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/// This function is deprecated for the MCJIT execution engine.
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virtual void *getPointerToNamedFunction(StringRef Name,
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bool AbortOnFailure = true) = 0;
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/// mapSectionAddress - map a section to its target address space value.
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/// Map the address of a JIT section as returned from the memory manager
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/// to the address in the target process as the running code will see it.
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/// This is the address which will be used for relocation resolution.
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virtual void mapSectionAddress(const void *LocalAddress,
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uint64_t TargetAddress) {
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llvm_unreachable("Re-mapping of section addresses not supported with this "
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"EE!");
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}
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/// generateCodeForModule - Run code generation for the specified module and
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/// load it into memory.
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///
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/// When this function has completed, all code and data for the specified
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/// module, and any module on which this module depends, will be generated
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/// and loaded into memory, but relocations will not yet have been applied
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/// and all memory will be readable and writable but not executable.
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///
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/// This function is primarily useful when generating code for an external
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/// target, allowing the client an opportunity to remap section addresses
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/// before relocations are applied. Clients that intend to execute code
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/// locally can use the getFunctionAddress call, which will generate code
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/// and apply final preparations all in one step.
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///
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/// This method has no effect for the interpeter.
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virtual void generateCodeForModule(Module *M) {}
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/// finalizeObject - ensure the module is fully processed and is usable.
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///
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/// It is the user-level function for completing the process of making the
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/// object usable for execution. It should be called after sections within an
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/// object have been relocated using mapSectionAddress. When this method is
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/// called the MCJIT execution engine will reapply relocations for a loaded
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/// object. This method has no effect for the interpeter.
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virtual void finalizeObject() {}
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/// runStaticConstructorsDestructors - This method is used to execute all of
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/// the static constructors or destructors for a program.
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///
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/// \param isDtors - Run the destructors instead of constructors.
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virtual void runStaticConstructorsDestructors(bool isDtors);
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/// This method is used to execute all of the static constructors or
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/// destructors for a particular module.
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///
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/// \param isDtors - Run the destructors instead of constructors.
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void runStaticConstructorsDestructors(Module &module, bool isDtors);
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/// runFunctionAsMain - This is a helper function which wraps runFunction to
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/// handle the common task of starting up main with the specified argc, argv,
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/// and envp parameters.
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int runFunctionAsMain(Function *Fn, const std::vector<std::string> &argv,
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const char * const * envp);
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/// addGlobalMapping - Tell the execution engine that the specified global is
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/// at the specified location. This is used internally as functions are JIT'd
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/// and as global variables are laid out in memory. It can and should also be
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/// used by clients of the EE that want to have an LLVM global overlay
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/// existing data in memory. Mappings are automatically removed when their
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/// GlobalValue is destroyed.
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void addGlobalMapping(const GlobalValue *GV, void *Addr);
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void addGlobalMapping(StringRef Name, uint64_t Addr);
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/// clearAllGlobalMappings - Clear all global mappings and start over again,
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/// for use in dynamic compilation scenarios to move globals.
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void clearAllGlobalMappings();
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/// clearGlobalMappingsFromModule - Clear all global mappings that came from a
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/// particular module, because it has been removed from the JIT.
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void clearGlobalMappingsFromModule(Module *M);
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/// updateGlobalMapping - Replace an existing mapping for GV with a new
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/// address. This updates both maps as required. If "Addr" is null, the
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/// entry for the global is removed from the mappings. This returns the old
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/// value of the pointer, or null if it was not in the map.
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uint64_t updateGlobalMapping(const GlobalValue *GV, void *Addr);
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uint64_t updateGlobalMapping(StringRef Name, uint64_t Addr);
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/// getAddressToGlobalIfAvailable - This returns the address of the specified
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/// global symbol.
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uint64_t getAddressToGlobalIfAvailable(StringRef S);
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/// getPointerToGlobalIfAvailable - This returns the address of the specified
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/// global value if it is has already been codegen'd, otherwise it returns
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/// null.
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void *getPointerToGlobalIfAvailable(StringRef S);
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void *getPointerToGlobalIfAvailable(const GlobalValue *GV);
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/// getPointerToGlobal - This returns the address of the specified global
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/// value. This may involve code generation if it's a function.
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///
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/// This function is deprecated for the MCJIT execution engine. Use
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/// getGlobalValueAddress instead.
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void *getPointerToGlobal(const GlobalValue *GV);
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/// getPointerToFunction - The different EE's represent function bodies in
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/// different ways. They should each implement this to say what a function
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/// pointer should look like. When F is destroyed, the ExecutionEngine will
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/// remove its global mapping and free any machine code. Be sure no threads
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/// are running inside F when that happens.
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///
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/// This function is deprecated for the MCJIT execution engine. Use
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/// getFunctionAddress instead.
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virtual void *getPointerToFunction(Function *F) = 0;
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/// getPointerToFunctionOrStub - If the specified function has been
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/// code-gen'd, return a pointer to the function. If not, compile it, or use
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/// a stub to implement lazy compilation if available. See
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/// getPointerToFunction for the requirements on destroying F.
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///
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/// This function is deprecated for the MCJIT execution engine. Use
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/// getFunctionAddress instead.
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virtual void *getPointerToFunctionOrStub(Function *F) {
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// Default implementation, just codegen the function.
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return getPointerToFunction(F);
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}
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/// getGlobalValueAddress - Return the address of the specified global
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/// value. This may involve code generation.
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///
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/// This function should not be called with the interpreter engine.
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virtual uint64_t getGlobalValueAddress(const std::string &Name) {
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// Default implementation for the interpreter. MCJIT will override this.
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// JIT and interpreter clients should use getPointerToGlobal instead.
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return 0;
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}
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/// getFunctionAddress - Return the address of the specified function.
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/// This may involve code generation.
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virtual uint64_t getFunctionAddress(const std::string &Name) {
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// Default implementation for the interpreter. MCJIT will override this.
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// Interpreter clients should use getPointerToFunction instead.
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return 0;
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}
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/// getGlobalValueAtAddress - Return the LLVM global value object that starts
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/// at the specified address.
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///
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const GlobalValue *getGlobalValueAtAddress(void *Addr);
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/// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr.
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/// Ptr is the address of the memory at which to store Val, cast to
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/// GenericValue *. It is not a pointer to a GenericValue containing the
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/// address at which to store Val.
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void StoreValueToMemory(const GenericValue &Val, GenericValue *Ptr,
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Type *Ty);
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void InitializeMemory(const Constant *Init, void *Addr);
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/// getOrEmitGlobalVariable - Return the address of the specified global
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/// variable, possibly emitting it to memory if needed. This is used by the
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/// Emitter.
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///
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/// This function is deprecated for the MCJIT execution engine. Use
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/// getGlobalValueAddress instead.
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virtual void *getOrEmitGlobalVariable(const GlobalVariable *GV) {
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return getPointerToGlobal((const GlobalValue *)GV);
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}
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/// Registers a listener to be called back on various events within
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/// the JIT. See JITEventListener.h for more details. Does not
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/// take ownership of the argument. The argument may be NULL, in
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/// which case these functions do nothing.
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virtual void RegisterJITEventListener(JITEventListener *) {}
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virtual void UnregisterJITEventListener(JITEventListener *) {}
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/// Sets the pre-compiled object cache. The ownership of the ObjectCache is
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/// not changed. Supported by MCJIT but not the interpreter.
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virtual void setObjectCache(ObjectCache *) {
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llvm_unreachable("No support for an object cache");
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}
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/// setProcessAllSections (MCJIT Only): By default, only sections that are
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/// "required for execution" are passed to the RTDyldMemoryManager, and other
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/// sections are discarded. Passing 'true' to this method will cause
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/// RuntimeDyld to pass all sections to its RTDyldMemoryManager regardless
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/// of whether they are "required to execute" in the usual sense.
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///
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/// Rationale: Some MCJIT clients want to be able to inspect metadata
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/// sections (e.g. Dwarf, Stack-maps) to enable functionality or analyze
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/// performance. Passing these sections to the memory manager allows the
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/// client to make policy about the relevant sections, rather than having
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/// MCJIT do it.
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virtual void setProcessAllSections(bool ProcessAllSections) {
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llvm_unreachable("No support for ProcessAllSections option");
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}
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/// Return the target machine (if available).
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virtual TargetMachine *getTargetMachine() { return nullptr; }
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/// DisableLazyCompilation - When lazy compilation is off (the default), the
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/// JIT will eagerly compile every function reachable from the argument to
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/// getPointerToFunction. If lazy compilation is turned on, the JIT will only
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/// compile the one function and emit stubs to compile the rest when they're
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/// first called. If lazy compilation is turned off again while some lazy
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/// stubs are still around, and one of those stubs is called, the program will
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/// abort.
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///
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/// In order to safely compile lazily in a threaded program, the user must
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/// ensure that 1) only one thread at a time can call any particular lazy
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/// stub, and 2) any thread modifying LLVM IR must hold the JIT's lock
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/// (ExecutionEngine::lock) or otherwise ensure that no other thread calls a
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/// lazy stub. See http://llvm.org/PR5184 for details.
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void DisableLazyCompilation(bool Disabled = true) {
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CompilingLazily = !Disabled;
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}
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bool isCompilingLazily() const {
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return CompilingLazily;
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}
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/// DisableGVCompilation - If called, the JIT will abort if it's asked to
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/// allocate space and populate a GlobalVariable that is not internal to
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/// the module.
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void DisableGVCompilation(bool Disabled = true) {
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GVCompilationDisabled = Disabled;
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}
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bool isGVCompilationDisabled() const {
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return GVCompilationDisabled;
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}
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/// DisableSymbolSearching - If called, the JIT will not try to lookup unknown
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/// symbols with dlsym. A client can still use InstallLazyFunctionCreator to
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/// resolve symbols in a custom way.
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void DisableSymbolSearching(bool Disabled = true) {
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SymbolSearchingDisabled = Disabled;
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}
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bool isSymbolSearchingDisabled() const {
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return SymbolSearchingDisabled;
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}
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/// Enable/Disable IR module verification.
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///
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/// Note: Module verification is enabled by default in Debug builds, and
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/// disabled by default in Release. Use this method to override the default.
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void setVerifyModules(bool Verify) {
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VerifyModules = Verify;
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}
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bool getVerifyModules() const {
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return VerifyModules;
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}
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/// InstallLazyFunctionCreator - If an unknown function is needed, the
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/// specified function pointer is invoked to create it. If it returns null,
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/// the JIT will abort.
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void InstallLazyFunctionCreator(void* (*P)(const std::string &)) {
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LazyFunctionCreator = P;
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}
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protected:
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ExecutionEngine() {}
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explicit ExecutionEngine(std::unique_ptr<Module> M);
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void emitGlobals();
|
|
|
|
void EmitGlobalVariable(const GlobalVariable *GV);
|
|
|
|
GenericValue getConstantValue(const Constant *C);
|
|
void LoadValueFromMemory(GenericValue &Result, GenericValue *Ptr,
|
|
Type *Ty);
|
|
};
|
|
|
|
namespace EngineKind {
|
|
// These are actually bitmasks that get or-ed together.
|
|
enum Kind {
|
|
JIT = 0x1,
|
|
Interpreter = 0x2
|
|
};
|
|
const static Kind Either = (Kind)(JIT | Interpreter);
|
|
}
|
|
|
|
/// Builder class for ExecutionEngines. Use this by stack-allocating a builder,
|
|
/// chaining the various set* methods, and terminating it with a .create()
|
|
/// call.
|
|
class EngineBuilder {
|
|
private:
|
|
std::unique_ptr<Module> M;
|
|
EngineKind::Kind WhichEngine;
|
|
std::string *ErrorStr;
|
|
CodeGenOpt::Level OptLevel;
|
|
std::shared_ptr<MCJITMemoryManager> MemMgr;
|
|
std::shared_ptr<RuntimeDyld::SymbolResolver> Resolver;
|
|
TargetOptions Options;
|
|
Reloc::Model RelocModel;
|
|
CodeModel::Model CMModel;
|
|
std::string MArch;
|
|
std::string MCPU;
|
|
SmallVector<std::string, 4> MAttrs;
|
|
bool VerifyModules;
|
|
bool UseOrcMCJITReplacement;
|
|
|
|
public:
|
|
/// Default constructor for EngineBuilder.
|
|
EngineBuilder();
|
|
|
|
/// Constructor for EngineBuilder.
|
|
EngineBuilder(std::unique_ptr<Module> M);
|
|
|
|
// Out-of-line since we don't have the def'n of RTDyldMemoryManager here.
|
|
~EngineBuilder();
|
|
|
|
/// setEngineKind - Controls whether the user wants the interpreter, the JIT,
|
|
/// or whichever engine works. This option defaults to EngineKind::Either.
|
|
EngineBuilder &setEngineKind(EngineKind::Kind w) {
|
|
WhichEngine = w;
|
|
return *this;
|
|
}
|
|
|
|
/// setMCJITMemoryManager - Sets the MCJIT memory manager to use. This allows
|
|
/// clients to customize their memory allocation policies for the MCJIT. This
|
|
/// is only appropriate for the MCJIT; setting this and configuring the builder
|
|
/// to create anything other than MCJIT will cause a runtime error. If create()
|
|
/// is called and is successful, the created engine takes ownership of the
|
|
/// memory manager. This option defaults to NULL.
|
|
EngineBuilder &setMCJITMemoryManager(std::unique_ptr<RTDyldMemoryManager> mcjmm);
|
|
|
|
EngineBuilder&
|
|
setMemoryManager(std::unique_ptr<MCJITMemoryManager> MM);
|
|
|
|
EngineBuilder&
|
|
setSymbolResolver(std::unique_ptr<RuntimeDyld::SymbolResolver> SR);
|
|
|
|
/// setErrorStr - Set the error string to write to on error. This option
|
|
/// defaults to NULL.
|
|
EngineBuilder &setErrorStr(std::string *e) {
|
|
ErrorStr = e;
|
|
return *this;
|
|
}
|
|
|
|
/// setOptLevel - Set the optimization level for the JIT. This option
|
|
/// defaults to CodeGenOpt::Default.
|
|
EngineBuilder &setOptLevel(CodeGenOpt::Level l) {
|
|
OptLevel = l;
|
|
return *this;
|
|
}
|
|
|
|
/// setTargetOptions - Set the target options that the ExecutionEngine
|
|
/// target is using. Defaults to TargetOptions().
|
|
EngineBuilder &setTargetOptions(const TargetOptions &Opts) {
|
|
Options = Opts;
|
|
return *this;
|
|
}
|
|
|
|
/// setRelocationModel - Set the relocation model that the ExecutionEngine
|
|
/// target is using. Defaults to target specific default "Reloc::Default".
|
|
EngineBuilder &setRelocationModel(Reloc::Model RM) {
|
|
RelocModel = RM;
|
|
return *this;
|
|
}
|
|
|
|
/// setCodeModel - Set the CodeModel that the ExecutionEngine target
|
|
/// data is using. Defaults to target specific default
|
|
/// "CodeModel::JITDefault".
|
|
EngineBuilder &setCodeModel(CodeModel::Model M) {
|
|
CMModel = M;
|
|
return *this;
|
|
}
|
|
|
|
/// setMArch - Override the architecture set by the Module's triple.
|
|
EngineBuilder &setMArch(StringRef march) {
|
|
MArch.assign(march.begin(), march.end());
|
|
return *this;
|
|
}
|
|
|
|
/// setMCPU - Target a specific cpu type.
|
|
EngineBuilder &setMCPU(StringRef mcpu) {
|
|
MCPU.assign(mcpu.begin(), mcpu.end());
|
|
return *this;
|
|
}
|
|
|
|
/// setVerifyModules - Set whether the JIT implementation should verify
|
|
/// IR modules during compilation.
|
|
EngineBuilder &setVerifyModules(bool Verify) {
|
|
VerifyModules = Verify;
|
|
return *this;
|
|
}
|
|
|
|
/// setMAttrs - Set cpu-specific attributes.
|
|
template<typename StringSequence>
|
|
EngineBuilder &setMAttrs(const StringSequence &mattrs) {
|
|
MAttrs.clear();
|
|
MAttrs.append(mattrs.begin(), mattrs.end());
|
|
return *this;
|
|
}
|
|
|
|
// \brief Use OrcMCJITReplacement instead of MCJIT. Off by default.
|
|
void setUseOrcMCJITReplacement(bool UseOrcMCJITReplacement) {
|
|
this->UseOrcMCJITReplacement = UseOrcMCJITReplacement;
|
|
}
|
|
|
|
TargetMachine *selectTarget();
|
|
|
|
/// selectTarget - Pick a target either via -march or by guessing the native
|
|
/// arch. Add any CPU features specified via -mcpu or -mattr.
|
|
TargetMachine *selectTarget(const Triple &TargetTriple,
|
|
StringRef MArch,
|
|
StringRef MCPU,
|
|
const SmallVectorImpl<std::string>& MAttrs);
|
|
|
|
ExecutionEngine *create() {
|
|
return create(selectTarget());
|
|
}
|
|
|
|
ExecutionEngine *create(TargetMachine *TM);
|
|
};
|
|
|
|
// Create wrappers for C Binding types (see CBindingWrapping.h).
|
|
DEFINE_SIMPLE_CONVERSION_FUNCTIONS(ExecutionEngine, LLVMExecutionEngineRef)
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|