Support: Write ScaledNumbers::getRounded()

[oota-llvm.git] / include / llvm / Support / MemoryBuffer.h

diff --git a/include/llvm/Support/MemoryBuffer.h b/include/llvm/Support/MemoryBuffer.h
index 06816de9716ae6a34e0e70a8d1b9304aee7ca8a4..8c742c686b15cd561ac1dbf86b29ac6584b64081 100644 (file)
--- a/include/llvm/Support/MemoryBuffer.h
+++ b/include/llvm/Support/MemoryBuffer.h
@@ -14,14 +14,15 @@
 #ifndef LLVM_SUPPORT_MEMORYBUFFER_H
 #define LLVM_SUPPORT_MEMORYBUFFER_H
 
-#include "llvm/ADT/StringRef.h"
+#include "llvm-c/Support.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Support/CBindingWrapping.h"
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/DataTypes.h"
+#include <memory>
+#include <system_error>
 
 namespace llvm {
-
-class error_code;
-template<class T> class OwningPtr;
-
 /// MemoryBuffer - This interface provides simple read-only access to a block
 /// of memory, and provides simple methods for reading files and standard input
 /// into a memory buffer.  In addition to basic access to the characters in the
@@ -36,8 +37,8 @@ class MemoryBuffer {
   const char *BufferStart; // Start of the buffer.
   const char *BufferEnd;   // End of the buffer.
 
-  MemoryBuffer(const MemoryBuffer &); // DO NOT IMPLEMENT
-  MemoryBuffer &operator=(const MemoryBuffer &); // DO NOT IMPLEMENT
+  MemoryBuffer(const MemoryBuffer &) LLVM_DELETED_FUNCTION;
+  MemoryBuffer &operator=(const MemoryBuffer &) LLVM_DELETED_FUNCTION;
 protected:
   MemoryBuffer() {}
   void init(const char *BufStart, const char *BufEnd,
@@ -63,22 +64,39 @@ public:
   /// MemoryBuffer if successful, otherwise returning null.  If FileSize is
   /// specified, this means that the client knows that the file exists and that
   /// it has the specified size.
-  static error_code getFile(StringRef Filename, OwningPtr<MemoryBuffer> &result,
-                            int64_t FileSize = -1,
-                            bool RequiresNullTerminator = true);
-  static error_code getFile(const char *Filename,
-                            OwningPtr<MemoryBuffer> &result,
-                            int64_t FileSize = -1,
-                            bool RequiresNullTerminator = true);
-
-  /// getOpenFile - Given an already-open file descriptor, read the file and
-  /// return a MemoryBuffer.
-  static error_code getOpenFile(int FD, const char *Filename,
-                                OwningPtr<MemoryBuffer> &result,
-                                uint64_t FileSize = -1,
-                                uint64_t MapSize = -1,
-                                int64_t Offset = 0,
-                                bool RequiresNullTerminator = true);
+  ///
+  /// \param IsVolatileSize Set to true to indicate that the file size may be
+  /// changing, e.g. when libclang tries to parse while the user is
+  /// editing/updating the file.
+  static std::error_code getFile(Twine Filename,
+                                 std::unique_ptr<MemoryBuffer> &Result,
+                                 int64_t FileSize = -1,
+                                 bool RequiresNullTerminator = true,
+                                 bool IsVolatileSize = false);
+
+  /// Given an already-open file descriptor, map some slice of it into a
+  /// MemoryBuffer. The slice is specified by an \p Offset and \p MapSize.
+  /// Since this is in the middle of a file, the buffer is not null terminated.
+  ///
+  /// \param IsVolatileSize Set to true to indicate that the file size may be
+  /// changing, e.g. when libclang tries to parse while the user is
+  /// editing/updating the file.
+  static std::error_code getOpenFileSlice(int FD, const char *Filename,
+                                          std::unique_ptr<MemoryBuffer> &Result,
+                                          uint64_t MapSize, int64_t Offset,
+                                          bool IsVolatileSize = false);
+
+  /// Given an already-open file descriptor, read the file and return a
+  /// MemoryBuffer.
+  ///
+  /// \param IsVolatileSize Set to true to indicate that the file size may be
+  /// changing, e.g. when libclang tries to parse while the user is
+  /// editing/updating the file.
+  static std::error_code getOpenFile(int FD, const char *Filename,
+                                     std::unique_ptr<MemoryBuffer> &Result,
+                                     uint64_t FileSize,
+                                     bool RequiresNullTerminator = true,
+                                     bool IsVolatileSize = false);
 
   /// getMemBuffer - Open the specified memory range as a MemoryBuffer.  Note
   /// that InputData must be null terminated if RequiresNullTerminator is true.
@@ -107,20 +125,15 @@ public:
 
   /// getSTDIN - Read all of stdin into a file buffer, and return it.
   /// If an error occurs, this returns null and sets ec.
-  static error_code getSTDIN(OwningPtr<MemoryBuffer> &result);
-
+  static std::error_code getSTDIN(std::unique_ptr<MemoryBuffer> &Result);
 
   /// getFileOrSTDIN - Open the specified file as a MemoryBuffer, or open stdin
   /// if the Filename is "-".  If an error occurs, this returns null and sets
   /// ec.
-  static error_code getFileOrSTDIN(StringRef Filename,
-                                   OwningPtr<MemoryBuffer> &result,
-                                   int64_t FileSize = -1);
-  static error_code getFileOrSTDIN(const char *Filename,
-                                   OwningPtr<MemoryBuffer> &result,
-                                   int64_t FileSize = -1);
-  
-  
+  static std::error_code getFileOrSTDIN(StringRef Filename,
+                                        std::unique_ptr<MemoryBuffer> &Result,
+                                        int64_t FileSize = -1);
+
   //===--------------------------------------------------------------------===//
   // Provided for performance analysis.
   //===--------------------------------------------------------------------===//
@@ -136,6 +149,9 @@ public:
   virtual BufferKind getBufferKind() const = 0;  
 };
 
+// Create wrappers for C Binding types (see CBindingWrapping.h).
+DEFINE_SIMPLE_CONVERSION_FUNCTIONS(MemoryBuffer, LLVMMemoryBufferRef)
+
 } // end namespace llvm
 
 #endif