Use InstrSlots::NUM rather than pre-dividing by four. Also, mark this const.

[oota-llvm.git] / include / llvm / System / Memory.h

diff --git a/include/llvm/System/Memory.h b/include/llvm/System/Memory.h
index 3b319cb3bafa28c91c003e0c2d2381bd55176142..52e1f3f14b7ea8e189314e25706d4cc0d9a8a88f 100644 (file)
--- a/include/llvm/System/Memory.h
+++ b/include/llvm/System/Memory.h
@@ -1,10 +1,10 @@
 //===- llvm/System/Memory.h - Memory Support --------------------*- C++ -*-===//
-// 
+//
 //                     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.
+//
 //===----------------------------------------------------------------------===//
 //
 // This file declares the llvm::sys::Memory class.
@@ -14,6 +14,8 @@
 #ifndef LLVM_SYSTEM_MEMORY_H
 #define LLVM_SYSTEM_MEMORY_H
 
+#include <string>
+
 namespace llvm {
 namespace sys {
 
@@ -24,10 +26,10 @@ 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;
   };
@@ -42,22 +44,30 @@ namespace sys {
     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. 
-      /// @throws std::string if an error occurred.
+      /// 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(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.
+      /// 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);
     /// @}
   };
 }
 }
 
-// vim: sw=2
-
 #endif