Import prebuilt clang toolchain for linux.
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+//===- RuntimeDyld.h - Run-time dynamic linker for MC-JIT -------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Interface for the runtime dynamic linker facilities of the MC-JIT.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_EXECUTIONENGINE_RUNTIMEDYLD_H
+#define LLVM_EXECUTIONENGINE_RUNTIMEDYLD_H
+
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/DebugInfo/DIContext.h"
+#include "llvm/ExecutionEngine/JITSymbol.h"
+#include "llvm/Object/ObjectFile.h"
+#include "llvm/Support/Error.h"
+#include <algorithm>
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+#include <map>
+#include <memory>
+#include <string>
+#include <system_error>
+
+namespace llvm {
+
+namespace object {
+
+template <typename T> class OwningBinary;
+
+} // end namespace object
+
+/// Base class for errors originating in RuntimeDyld, e.g. missing relocation
+/// support.
+class RuntimeDyldError : public ErrorInfo<RuntimeDyldError> {
+public:
+ static char ID;
+
+ RuntimeDyldError(std::string ErrMsg) : ErrMsg(std::move(ErrMsg)) {}
+
+ void log(raw_ostream &OS) const override;
+ const std::string &getErrorMessage() const { return ErrMsg; }
+ std::error_code convertToErrorCode() const override;
+
+private:
+ std::string ErrMsg;
+};
+
+class RuntimeDyldCheckerImpl;
+class RuntimeDyldImpl;
+
+class RuntimeDyld {
+ friend class RuntimeDyldCheckerImpl;
+
+protected:
+ // Change the address associated with a section when resolving relocations.
+ // Any relocations already associated with the symbol will be re-resolved.
+ void reassignSectionAddress(unsigned SectionID, uint64_t Addr);
+
+public:
+ /// \brief Information about the loaded object.
+ class LoadedObjectInfo : public llvm::LoadedObjectInfo {
+ friend class RuntimeDyldImpl;
+
+ public:
+ using ObjSectionToIDMap = std::map<object::SectionRef, unsigned>;
+
+ LoadedObjectInfo(RuntimeDyldImpl &RTDyld, ObjSectionToIDMap ObjSecToIDMap)
+ : RTDyld(RTDyld), ObjSecToIDMap(std::move(ObjSecToIDMap)) {}
+
+ virtual object::OwningBinary<object::ObjectFile>
+ getObjectForDebug(const object::ObjectFile &Obj) const = 0;
+
+ uint64_t
+ getSectionLoadAddress(const object::SectionRef &Sec) const override;
+
+ protected:
+ virtual void anchor();
+
+ RuntimeDyldImpl &RTDyld;
+ ObjSectionToIDMap ObjSecToIDMap;
+ };
+
+ /// \brief Memory Management.
+ class MemoryManager {
+ friend class RuntimeDyld;
+
+ public:
+ MemoryManager() = default;
+ virtual ~MemoryManager() = default;
+
+ /// Allocate a memory block of (at least) the given size suitable for
+ /// executable code. The SectionID is a unique identifier assigned by the
+ /// RuntimeDyld instance, and optionally recorded by the memory manager to
+ /// access a loaded section.
+ virtual uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment,
+ unsigned SectionID,
+ StringRef SectionName) = 0;
+
+ /// Allocate a memory block of (at least) the given size suitable for data.
+ /// The SectionID is a unique identifier assigned by the JIT engine, and
+ /// optionally recorded by the memory manager to access a loaded section.
+ virtual uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment,
+ unsigned SectionID,
+ StringRef SectionName,
+ bool IsReadOnly) = 0;
+
+ /// Inform the memory manager about the total amount of memory required to
+ /// allocate all sections to be loaded:
+ /// \p CodeSize - the total size of all code sections
+ /// \p DataSizeRO - the total size of all read-only data sections
+ /// \p DataSizeRW - the total size of all read-write data sections
+ ///
+ /// Note that by default the callback is disabled. To enable it
+ /// redefine the method needsToReserveAllocationSpace to return true.
+ virtual void reserveAllocationSpace(uintptr_t CodeSize, uint32_t CodeAlign,
+ uintptr_t RODataSize,
+ uint32_t RODataAlign,
+ uintptr_t RWDataSize,
+ uint32_t RWDataAlign) {}
+
+ /// Override to return true to enable the reserveAllocationSpace callback.
+ virtual bool needsToReserveAllocationSpace() { return false; }
+
+ /// Register the EH frames with the runtime so that c++ exceptions work.
+ ///
+ /// \p Addr parameter provides the local address of the EH frame section
+ /// data, while \p LoadAddr provides the address of the data in the target
+ /// address space. If the section has not been remapped (which will usually
+ /// be the case for local execution) these two values will be the same.
+ virtual void registerEHFrames(uint8_t *Addr, uint64_t LoadAddr,
+ size_t Size) = 0;
+ virtual void deregisterEHFrames() = 0;
+
+ /// This method is called when object loading is complete and section page
+ /// permissions can be applied. It is up to the memory manager implementation
+ /// to decide whether or not to act on this method. The memory manager will
+ /// typically allocate all sections as read-write and then apply specific
+ /// permissions when this method is called. Code sections cannot be executed
+ /// until this function has been called. In addition, any cache coherency
+ /// operations needed to reliably use the memory are also performed.
+ ///
+ /// Returns true if an error occurred, false otherwise.
+ virtual bool finalizeMemory(std::string *ErrMsg = nullptr) = 0;
+
+ /// This method is called after an object has been loaded into memory but
+ /// before relocations are applied to the loaded sections.
+ ///
+ /// Memory managers which are preparing code for execution in an external
+ /// address space can use this call to remap the section addresses for the
+ /// newly loaded object.
+ ///
+ /// For clients that do not need access to an ExecutionEngine instance this
+ /// method should be preferred to its cousin
+ /// MCJITMemoryManager::notifyObjectLoaded as this method is compatible with
+ /// ORC JIT stacks.
+ virtual void notifyObjectLoaded(RuntimeDyld &RTDyld,
+ const object::ObjectFile &Obj) {}
+
+ private:
+ virtual void anchor();
+
+ bool FinalizationLocked = false;
+ };
+
+ /// \brief Construct a RuntimeDyld instance.
+ RuntimeDyld(MemoryManager &MemMgr, JITSymbolResolver &Resolver);
+ RuntimeDyld(const RuntimeDyld &) = delete;
+ RuntimeDyld &operator=(const RuntimeDyld &) = delete;
+ ~RuntimeDyld();
+
+ /// Add the referenced object file to the list of objects to be loaded and
+ /// relocated.
+ std::unique_ptr<LoadedObjectInfo> loadObject(const object::ObjectFile &O);
+
+ /// Get the address of our local copy of the symbol. This may or may not
+ /// be the address used for relocation (clients can copy the data around
+ /// and resolve relocatons based on where they put it).
+ void *getSymbolLocalAddress(StringRef Name) const;
+
+ /// Get the target address and flags for the named symbol.
+ /// This address is the one used for relocation.
+ JITEvaluatedSymbol getSymbol(StringRef Name) const;
+
+ /// Returns a copy of the symbol table. This can be used by on-finalized
+ /// callbacks to extract the symbol table before throwing away the
+ /// RuntimeDyld instance. Because the map keys (StringRefs) are backed by
+ /// strings inside the RuntimeDyld instance, the map should be processed
+ /// before the RuntimeDyld instance is discarded.
+ std::map<StringRef, JITEvaluatedSymbol> getSymbolTable() const;
+
+ /// Resolve the relocations for all symbols we currently know about.
+ void resolveRelocations();
+
+ /// Map a section to its target address space value.
+ /// Map the address of a JIT section as returned from the memory manager
+ /// to the address in the target process as the running code will see it.
+ /// This is the address which will be used for relocation resolution.
+ void mapSectionAddress(const void *LocalAddress, uint64_t TargetAddress);
+
+ /// Register any EH frame sections that have been loaded but not previously
+ /// registered with the memory manager. Note, RuntimeDyld is responsible
+ /// for identifying the EH frame and calling the memory manager with the
+ /// EH frame section data. However, the memory manager itself will handle
+ /// the actual target-specific EH frame registration.
+ void registerEHFrames();
+
+ void deregisterEHFrames();
+
+ bool hasError();
+ StringRef getErrorString();
+
+ /// By default, only sections that are "required for execution" are passed to
+ /// the RTDyldMemoryManager, and other sections are discarded. Passing 'true'
+ /// to this method will cause RuntimeDyld to pass all sections to its
+ /// memory manager regardless of whether they are "required to execute" in the
+ /// usual sense. This is useful for inspecting metadata sections that may not
+ /// contain relocations, E.g. Debug info, stackmaps.
+ ///
+ /// Must be called before the first object file is loaded.
+ void setProcessAllSections(bool ProcessAllSections) {
+ assert(!Dyld && "setProcessAllSections must be called before loadObject.");
+ this->ProcessAllSections = ProcessAllSections;
+ }
+
+ /// Perform all actions needed to make the code owned by this RuntimeDyld
+ /// instance executable:
+ ///
+ /// 1) Apply relocations.
+ /// 2) Register EH frames.
+ /// 3) Update memory permissions*.
+ ///
+ /// * Finalization is potentially recursive**, and the 3rd step will only be
+ /// applied by the outermost call to finalize. This allows different
+ /// RuntimeDyld instances to share a memory manager without the innermost
+ /// finalization locking the memory and causing relocation fixup errors in
+ /// outer instances.
+ ///
+ /// ** Recursive finalization occurs when one RuntimeDyld instances needs the
+ /// address of a symbol owned by some other instance in order to apply
+ /// relocations.
+ ///
+ void finalizeWithMemoryManagerLocking();
+
+private:
+ // RuntimeDyldImpl is the actual class. RuntimeDyld is just the public
+ // interface.
+ std::unique_ptr<RuntimeDyldImpl> Dyld;
+ MemoryManager &MemMgr;
+ JITSymbolResolver &Resolver;
+ bool ProcessAllSections;
+ RuntimeDyldCheckerImpl *Checker;
+};
+
+} // end namespace llvm
+
+#endif // LLVM_EXECUTIONENGINE_RUNTIMEDYLD_H