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-rw-r--r--include/llvm/System/Memory.h96
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diff --git a/include/llvm/System/Memory.h b/include/llvm/System/Memory.h
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--- a/include/llvm/System/Memory.h
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-//===- llvm/System/Memory.h - Memory Support --------------------*- C++ -*-===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file declares the llvm::sys::Memory class.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_SYSTEM_MEMORY_H
-#define LLVM_SYSTEM_MEMORY_H
-
-#include "llvm/System/DataTypes.h"
-#include <string>
-
-namespace llvm {
-namespace sys {
-
- /// This class encapsulates the notion of a memory block which has an address
- /// and a size. It is used by the Memory class (a friend) as the result of
- /// various memory allocation operations.
- /// @see Memory
- /// @brief Memory block abstraction.
- class MemoryBlock {
- public:
- MemoryBlock() : Address(0), Size(0) { }
- MemoryBlock(void *addr, size_t size) : Address(addr), Size(size) { }
- void *base() const { return Address; }
- size_t size() const { return Size; }
- private:
- void *Address; ///< Address of first byte of memory area
- size_t Size; ///< Size, in bytes of the memory area
- friend class Memory;
- };
-
- /// This class provides various memory handling functions that manipulate
- /// MemoryBlock instances.
- /// @since 1.4
- /// @brief An abstraction for memory operations.
- class Memory {
- public:
- /// This method allocates a block of Read/Write/Execute memory that is
- /// suitable for executing dynamically generated code (e.g. JIT). An
- /// attempt to allocate \p NumBytes bytes of virtual memory is made.
- /// \p NearBlock may point to an existing allocation in which case
- /// an attempt is made to allocate more memory near the existing block.
- ///
- /// On success, this returns a non-null memory block, otherwise it returns
- /// a null memory block and fills in *ErrMsg.
- ///
- /// @brief Allocate Read/Write/Execute memory.
- static MemoryBlock AllocateRWX(size_t NumBytes,
- const MemoryBlock *NearBlock,
- std::string *ErrMsg = 0);
-
- /// This method releases a block of Read/Write/Execute memory that was
- /// allocated with the AllocateRWX method. It should not be used to
- /// release any memory block allocated any other way.
- ///
- /// On success, this returns false, otherwise it returns true and fills
- /// in *ErrMsg.
- /// @brief Release Read/Write/Execute memory.
- static bool ReleaseRWX(MemoryBlock &block, std::string *ErrMsg = 0);
-
-
- /// InvalidateInstructionCache - Before the JIT can run a block of code
- /// that has been emitted it must invalidate the instruction cache on some
- /// platforms.
- static void InvalidateInstructionCache(const void *Addr, size_t Len);
-
- /// setExecutable - Before the JIT can run a block of code, it has to be
- /// given read and executable privilege. Return true if it is already r-x
- /// or the system is able to change its previlege.
- static bool setExecutable (MemoryBlock &M, std::string *ErrMsg = 0);
-
- /// setWritable - When adding to a block of code, the JIT may need
- /// to mark a block of code as RW since the protections are on page
- /// boundaries, and the JIT internal allocations are not page aligned.
- static bool setWritable (MemoryBlock &M, std::string *ErrMsg = 0);
-
- /// setRangeExecutable - Mark the page containing a range of addresses
- /// as executable.
- static bool setRangeExecutable(const void *Addr, size_t Size);
-
- /// setRangeWritable - Mark the page containing a range of addresses
- /// as writable.
- static bool setRangeWritable(const void *Addr, size_t Size);
- };
-}
-}
-
-#endif