Import prebuilt clang toolchain for linux.
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+//===- SectionMemoryManager.h - Memory manager for MCJIT/RtDyld -*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the declaration of a section-based memory manager used by
+// the MCJIT execution engine and RuntimeDyld.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_EXECUTIONENGINE_SECTIONMEMORYMANAGER_H
+#define LLVM_EXECUTIONENGINE_SECTIONMEMORYMANAGER_H
+
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
+#include "llvm/Support/Memory.h"
+#include <cstdint>
+#include <string>
+#include <system_error>
+
+namespace llvm {
+
+/// This is a simple memory manager which implements the methods called by
+/// the RuntimeDyld class to allocate memory for section-based loading of
+/// objects, usually those generated by the MCJIT execution engine.
+///
+/// This memory manager allocates all section memory as read-write. The
+/// RuntimeDyld will copy JITed section memory into these allocated blocks
+/// and perform any necessary linking and relocations.
+///
+/// Any client using this memory manager MUST ensure that section-specific
+/// page permissions have been applied before attempting to execute functions
+/// in the JITed object. Permissions can be applied either by calling
+/// MCJIT::finalizeObject or by calling SectionMemoryManager::finalizeMemory
+/// directly. Clients of MCJIT should call MCJIT::finalizeObject.
+class SectionMemoryManager : public RTDyldMemoryManager {
+public:
+ /// This enum describes the various reasons to allocate pages from
+ /// allocateMappedMemory.
+ enum class AllocationPurpose {
+ Code,
+ ROData,
+ RWData,
+ };
+
+ /// Implementations of this interface are used by SectionMemoryManager to
+ /// request pages from the operating system.
+ class MemoryMapper {
+ public:
+ /// This method attempts to allocate \p NumBytes bytes of virtual memory for
+ /// \p Purpose. \p NearBlock may point to an existing allocation, in which
+ /// case an attempt is made to allocate more memory near the existing block.
+ /// The actual allocated address is not guaranteed to be near the requested
+ /// address. \p Flags is used to set the initial protection flags for the
+ /// block of the memory. \p EC [out] returns an object describing any error
+ /// that occurs.
+ ///
+ /// This method may allocate more than the number of bytes requested. The
+ /// actual number of bytes allocated is indicated in the returned
+ /// MemoryBlock.
+ ///
+ /// The start of the allocated block must be aligned with the system
+ /// allocation granularity (64K on Windows, page size on Linux). If the
+ /// address following \p NearBlock is not so aligned, it will be rounded up
+ /// to the next allocation granularity boundary.
+ ///
+ /// \r a non-null MemoryBlock if the function was successful, otherwise a
+ /// null MemoryBlock with \p EC describing the error.
+ virtual sys::MemoryBlock
+ allocateMappedMemory(AllocationPurpose Purpose, size_t NumBytes,
+ const sys::MemoryBlock *const NearBlock,
+ unsigned Flags, std::error_code &EC) = 0;
+
+ /// This method sets the protection flags for a block of memory to the state
+ /// specified by \p Flags. The behavior is not specified if the memory was
+ /// not allocated using the allocateMappedMemory method.
+ /// \p Block describes the memory block to be protected.
+ /// \p Flags specifies the new protection state to be assigned to the block.
+ ///
+ /// If \p Flags is MF_WRITE, the actual behavior varies with the operating
+ /// system (i.e. MF_READ | MF_WRITE on Windows) and the target architecture
+ /// (i.e. MF_WRITE -> MF_READ | MF_WRITE on i386).
+ ///
+ /// \r error_success if the function was successful, or an error_code
+ /// describing the failure if an error occurred.
+ virtual std::error_code protectMappedMemory(const sys::MemoryBlock &Block,
+ unsigned Flags) = 0;
+
+ /// This method releases a block of memory that was allocated with the
+ /// allocateMappedMemory method. It should not be used to release any memory
+ /// block allocated any other way.
+ /// \p Block describes the memory to be released.
+ ///
+ /// \r error_success if the function was successful, or an error_code
+ /// describing the failure if an error occurred.
+ virtual std::error_code releaseMappedMemory(sys::MemoryBlock &M) = 0;
+
+ virtual ~MemoryMapper();
+ };
+
+ /// Creates a SectionMemoryManager instance with \p MM as the associated
+ /// memory mapper. If \p MM is nullptr then a default memory mapper is used
+ /// that directly calls into the operating system.
+ SectionMemoryManager(MemoryMapper *MM = nullptr);
+ SectionMemoryManager(const SectionMemoryManager &) = delete;
+ void operator=(const SectionMemoryManager &) = delete;
+ ~SectionMemoryManager() override;
+
+ /// \brief Allocates a memory block of (at least) the given size suitable for
+ /// executable code.
+ ///
+ /// The value of \p Alignment must be a power of two. If \p Alignment is zero
+ /// a default alignment of 16 will be used.
+ uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment,
+ unsigned SectionID,
+ StringRef SectionName) override;
+
+ /// \brief Allocates a memory block of (at least) the given size suitable for
+ /// executable code.
+ ///
+ /// The value of \p Alignment must be a power of two. If \p Alignment is zero
+ /// a default alignment of 16 will be used.
+ uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment,
+ unsigned SectionID, StringRef SectionName,
+ bool isReadOnly) override;
+
+ /// \brief Update section-specific memory permissions and other attributes.
+ ///
+ /// 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.
+ bool finalizeMemory(std::string *ErrMsg = nullptr) override;
+
+ /// \brief Invalidate instruction cache for code sections.
+ ///
+ /// Some platforms with separate data cache and instruction cache require
+ /// explicit cache flush, otherwise JIT code manipulations (like resolved
+ /// relocations) will get to the data cache but not to the instruction cache.
+ ///
+ /// This method is called from finalizeMemory.
+ virtual void invalidateInstructionCache();
+
+private:
+ struct FreeMemBlock {
+ // The actual block of free memory
+ sys::MemoryBlock Free;
+ // If there is a pending allocation from the same reservation right before
+ // this block, store it's index in PendingMem, to be able to update the
+ // pending region if part of this block is allocated, rather than having to
+ // create a new one
+ unsigned PendingPrefixIndex;
+ };
+
+ struct MemoryGroup {
+ // PendingMem contains all blocks of memory (subblocks of AllocatedMem)
+ // which have not yet had their permissions applied, but have been given
+ // out to the user. FreeMem contains all block of memory, which have
+ // neither had their permissions applied, nor been given out to the user.
+ SmallVector<sys::MemoryBlock, 16> PendingMem;
+ SmallVector<FreeMemBlock, 16> FreeMem;
+
+ // All memory blocks that have been requested from the system
+ SmallVector<sys::MemoryBlock, 16> AllocatedMem;
+
+ sys::MemoryBlock Near;
+ };
+
+ uint8_t *allocateSection(AllocationPurpose Purpose, uintptr_t Size,
+ unsigned Alignment);
+
+ std::error_code applyMemoryGroupPermissions(MemoryGroup &MemGroup,
+ unsigned Permissions);
+
+ MemoryGroup CodeMem;
+ MemoryGroup RWDataMem;
+ MemoryGroup RODataMem;
+ MemoryMapper &MMapper;
+};
+
+} // end namespace llvm
+
+#endif // LLVM_EXECUTION_ENGINE_SECTION_MEMORY_MANAGER_H