#ifndef LLVM_SUPPORT_MEMORYBUFFER_H
#define LLVM_SUPPORT_MEMORYBUFFER_H
-#include "llvm/ADT/StringRef.h"
-#include "llvm/System/DataTypes.h"
-#include <string>
+#include "llvm-c/Support.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Support/CBindingWrapping.h"
+#include "llvm/Support/DataTypes.h"
+#include "llvm/Support/ErrorOr.h"
+#include <memory>
namespace llvm {
+class MemoryBufferRef;
-/// 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
-/// file, this interface guarantees you can read one character past the end of
-/// the file, and that this character will read as '\0'.
+/// 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 file, this
+/// interface guarantees you can read one character past the end of the file,
+/// and that this character will read as '\0'.
///
/// The '\0' guarantee is needed to support an optimization -- it's intended to
/// be more efficient for clients which are reading all the data to stop
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 &) = delete;
+ MemoryBuffer &operator=(const MemoryBuffer &) = delete;
protected:
MemoryBuffer() {}
- void init(const char *BufStart, const char *BufEnd);
+ void init(const char *BufStart, const char *BufEnd,
+ bool RequiresNullTerminator);
public:
virtual ~MemoryBuffer();
const char *getBufferEnd() const { return BufferEnd; }
size_t getBufferSize() const { return BufferEnd-BufferStart; }
- StringRef getBuffer() const {
- return StringRef(BufferStart, getBufferSize());
+ StringRef getBuffer() const {
+ return StringRef(BufferStart, getBufferSize());
}
- /// getBufferIdentifier - Return an identifier for this buffer, typically the
- /// filename it was read from.
+ /// Return an identifier for this buffer, typically the filename it was read
+ /// from.
virtual const char *getBufferIdentifier() const {
return "Unknown buffer";
}
- /// getFile - Open the specified file as a MemoryBuffer, returning a new
- /// 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 MemoryBuffer *getFile(StringRef Filename,
- std::string *ErrStr = 0,
- int64_t FileSize = -1);
- static MemoryBuffer *getFile(const char *Filename,
- std::string *ErrStr = 0,
- int64_t FileSize = -1);
-
- /// getMemBuffer - Open the specified memory range as a MemoryBuffer. Note
- /// that InputData must be null terminated.
- static MemoryBuffer *getMemBuffer(StringRef InputData,
- StringRef BufferName = "");
-
- /// getMemBufferCopy - Open the specified memory range as a MemoryBuffer,
- /// copying the contents and taking ownership of it. InputData does not
- /// have to be null terminated.
- static MemoryBuffer *getMemBufferCopy(StringRef InputData,
- StringRef BufferName = "");
-
- /// getNewMemBuffer - Allocate a new MemoryBuffer of the specified size that
- /// is completely initialized to zeros. Note that the caller should
- /// initialize the memory allocated by this method. The memory is owned by
- /// the MemoryBuffer object.
- static MemoryBuffer *getNewMemBuffer(size_t Size, StringRef BufferName = "");
-
- /// getNewUninitMemBuffer - Allocate a new MemoryBuffer of the specified size
- /// that is not initialized. Note that the caller should initialize the
- /// memory allocated by this method. The memory is owned by the MemoryBuffer
- /// object.
- static MemoryBuffer *getNewUninitMemBuffer(size_t Size,
- StringRef BufferName = "");
-
- /// getSTDIN - Read all of stdin into a file buffer, and return it.
- /// If an error occurs, this returns null and fills in *ErrStr with a reason.
- static MemoryBuffer *getSTDIN(std::string *ErrStr = 0);
-
-
- /// getFileOrSTDIN - Open the specified file as a MemoryBuffer, or open stdin
- /// if the Filename is "-". If an error occurs, this returns null and fills
- /// in *ErrStr with a reason.
- static MemoryBuffer *getFileOrSTDIN(StringRef Filename,
- std::string *ErrStr = 0,
- int64_t FileSize = -1);
- static MemoryBuffer *getFileOrSTDIN(const char *Filename,
- std::string *ErrStr = 0,
- int64_t FileSize = -1);
+ /// Open the specified file as a MemoryBuffer, returning a new 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.
+ ///
+ /// \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 ErrorOr<std::unique_ptr<MemoryBuffer>>
+ getFile(const Twine &Filename, 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.
+ static ErrorOr<std::unique_ptr<MemoryBuffer>>
+ getOpenFileSlice(int FD, const Twine &Filename, uint64_t MapSize,
+ int64_t Offset);
+
+ /// 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 ErrorOr<std::unique_ptr<MemoryBuffer>>
+ getOpenFile(int FD, const Twine &Filename, uint64_t FileSize,
+ bool RequiresNullTerminator = true, bool IsVolatileSize = false);
+
+ /// Open the specified memory range as a MemoryBuffer. Note that InputData
+ /// must be null terminated if RequiresNullTerminator is true.
+ static std::unique_ptr<MemoryBuffer>
+ getMemBuffer(StringRef InputData, StringRef BufferName = "",
+ bool RequiresNullTerminator = true);
+
+ static std::unique_ptr<MemoryBuffer>
+ getMemBuffer(MemoryBufferRef Ref, bool RequiresNullTerminator = true);
+
+ /// Open the specified memory range as a MemoryBuffer, copying the contents
+ /// and taking ownership of it. InputData does not have to be null terminated.
+ static std::unique_ptr<MemoryBuffer>
+ getMemBufferCopy(StringRef InputData, const Twine &BufferName = "");
+
+ /// Allocate a new zero-initialized MemoryBuffer of the specified size. Note
+ /// that the caller need not initialize the memory allocated by this method.
+ /// The memory is owned by the MemoryBuffer object.
+ static std::unique_ptr<MemoryBuffer>
+ getNewMemBuffer(size_t Size, StringRef BufferName = "");
+
+ /// Allocate a new MemoryBuffer of the specified size that is not initialized.
+ /// Note that the caller should initialize the memory allocated by this
+ /// method. The memory is owned by the MemoryBuffer object.
+ static std::unique_ptr<MemoryBuffer>
+ getNewUninitMemBuffer(size_t Size, const Twine &BufferName = "");
+
+ /// Read all of stdin into a file buffer, and return it.
+ static ErrorOr<std::unique_ptr<MemoryBuffer>> getSTDIN();
+
+ /// Open the specified file as a MemoryBuffer, or open stdin if the Filename
+ /// is "-".
+ static ErrorOr<std::unique_ptr<MemoryBuffer>>
+ getFileOrSTDIN(const Twine &Filename, int64_t FileSize = -1,
+ bool RequiresNullTerminator = true);
+
+ /// Map a subrange of the specified file as a MemoryBuffer.
+ static ErrorOr<std::unique_ptr<MemoryBuffer>>
+ getFileSlice(const Twine &Filename, uint64_t MapSize, uint64_t Offset);
+
+ //===--------------------------------------------------------------------===//
+ // Provided for performance analysis.
+ //===--------------------------------------------------------------------===//
+
+ /// The kind of memory backing used to support the MemoryBuffer.
+ enum BufferKind {
+ MemoryBuffer_Malloc,
+ MemoryBuffer_MMap
+ };
+
+ /// Return information on the memory mechanism used to support the
+ /// MemoryBuffer.
+ virtual BufferKind getBufferKind() const = 0;
+
+ MemoryBufferRef getMemBufferRef() const;
};
+class MemoryBufferRef {
+ StringRef Buffer;
+ StringRef Identifier;
+
+public:
+ MemoryBufferRef() {}
+ MemoryBufferRef(MemoryBuffer& Buffer)
+ : Buffer(Buffer.getBuffer()), Identifier(Buffer.getBufferIdentifier()) {}
+ MemoryBufferRef(StringRef Buffer, StringRef Identifier)
+ : Buffer(Buffer), Identifier(Identifier) {}
+
+ StringRef getBuffer() const { return Buffer; }
+
+ StringRef getBufferIdentifier() const { return Identifier; }
+
+ const char *getBufferStart() const { return Buffer.begin(); }
+ const char *getBufferEnd() const { return Buffer.end(); }
+ size_t getBufferSize() const { return Buffer.size(); }
+};
+
+// Create wrappers for C Binding types (see CBindingWrapping.h).
+DEFINE_SIMPLE_CONVERSION_FUNCTIONS(MemoryBuffer, LLVMMemoryBufferRef)
+
} // end namespace llvm
#endif
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