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66 lines
2.3 KiB
C++
66 lines
2.3 KiB
C++
//===- llvm/System/Memory.h - Memory Support --------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Reid Spencer and is distributed under the
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// University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the llvm::sys::Memory class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SYSTEM_MEMORY_H
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#define LLVM_SYSTEM_MEMORY_H
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namespace llvm {
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namespace sys {
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/// This class encapsulates the notion of a memory block which has an address
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/// and a size. It is used by the Memory class (a friend) as the result of
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/// various memory allocation operations.
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/// @see Memory
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/// @brief Memory block abstraction.
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class MemoryBlock {
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public:
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void* base() const { return Address; }
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unsigned size() const { return Size; }
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private:
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void * Address; ///< Address of first byte of memory area
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unsigned Size; ///< Size, in bytes of the memory area
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friend class Memory;
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};
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/// This class provides various memory handling functions that manipulate
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/// MemoryBlock instances.
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/// @since 1.4
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/// @brief An abstraction for memory operations.
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class Memory {
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/// @name Functions
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/// @{
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public:
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/// This method allocates a block of Read/Write/Execute memory that is
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/// suitable for executing dynamically generated code (e.g. JIT). An
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/// attempt to allocate \p NumBytes bytes of virtual memory is made.
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/// \p NearBlock may point to an existing allocation in which case
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/// an attempt is made to allocate more memory near the existing block.
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/// @throws std::string if an error occurred.
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/// @brief Allocate Read/Write/Execute memory.
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static MemoryBlock AllocateRWX(unsigned NumBytes, const MemoryBlock* NearBlock);
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/// This method releases a block of Read/Write/Execute memory that was
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/// allocated with the AllocateRWX method. It should not be used to
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/// release any memory block allocated any other way.
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/// @throws std::string if an error occurred.
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/// @brief Release Read/Write/Execute memory.
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static void ReleaseRWX(MemoryBlock& block);
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/// @}
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};
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}
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}
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#endif
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