//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Reid Spencer and is distributed under the
-// University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#ifndef LLVM_SYSTEM_MEMORY_H
#define LLVM_SYSTEM_MEMORY_H
+#include <string>
+
namespace llvm {
namespace sys {
/// @brief Memory block abstraction.
class MemoryBlock {
public:
- void* base() const { return Address; }
+ void *base() const { return Address; }
unsigned size() const { return Size; }
private:
- void * Address; ///< Address of first byte of memory area
+ void *Address; ///< Address of first byte of memory area
unsigned Size; ///< Size, in bytes of the memory area
friend class Memory;
};
/// 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.
- /// @throws std::string if an error occurred.
+ /// \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(unsigned NumBytes);
+ static MemoryBlock AllocateRWX(unsigned 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.
/// @throws std::string if an error occurred.
/// @brief Release Read/Write/Execute memory.
- static void ReleaseRWX(MemoryBlock& block);
-
+ static bool ReleaseRWX(MemoryBlock &block, std::string *ErrMsg = 0);
/// @}
};
}
}
-
#endif