Import LLVM, at r72732.

1 files changed, 346 insertions, 0 deletions

diff --git a/include/llvm/Support/raw_ostream.h b/include/llvm/Support/raw_ostream.h
new file mode 100644
index 0000000..b67d126
--- /dev/null
+++ b/include/llvm/Support/raw_ostream.h
@@ -0,0 +1,346 @@
+//===--- raw_ostream.h - Raw output stream ----------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines the raw_ostream class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_RAW_OSTREAM_H
+#define LLVM_SUPPORT_RAW_OSTREAM_H
+
+#include "llvm/ADT/StringExtras.h"
+#include <cassert>
+#include <cstring>
+#include <string>
+#include <iosfwd>
+
+namespace llvm {
+  class format_object_base;
+  template <typename T>
+  class SmallVectorImpl;
+
+/// raw_ostream - This class implements an extremely fast bulk output stream
+/// that can *only* output to a stream.  It does not support seeking, reopening,
+/// rewinding, line buffered disciplines etc. It is a simple buffer that outputs
+/// a chunk at a time.
+class raw_ostream {
+private:
+  /// The buffer is handled in such a way that the buffer is
+  /// uninitialized, unbuffered, or out of space when OutBufCur >=
+  /// OutBufEnd. Thus a single comparison suffices to determine if we
+  /// need to take the slow path to write a single character.
+  ///
+  /// The buffer is in one of three states:
+  ///  1. Unbuffered (Unbuffered == true)
+  ///  1. Uninitialized (Unbuffered == false && OutBufStart == 0).
+  ///  2. Buffered (Unbuffered == false && OutBufStart != 0 &&
+  ///               OutBufEnd - OutBufStart >= 64).
+  char *OutBufStart, *OutBufEnd, *OutBufCur;
+  bool Unbuffered;
+
+public:
+  explicit raw_ostream(bool unbuffered=false) : Unbuffered(unbuffered) {
+    // Start out ready to flush.
+    OutBufStart = OutBufEnd = OutBufCur = 0;
+  }
+
+  virtual ~raw_ostream() {
+    delete [] OutBufStart;
+  }
+
+  /// tell - Return the current offset with the file.
+  uint64_t tell() { return current_pos() + GetNumBytesInBuffer(); }
+
+  //===--------------------------------------------------------------------===//
+  // Configuration Interface
+  //===--------------------------------------------------------------------===//
+
+  /// SetBufferSize - Set the internal buffer size to the specified amount
+  /// instead of the default.
+  void SetBufferSize(unsigned Size=4096) {
+    assert(Size >= 64 &&
+           "Buffer size must be somewhat large for invariants to hold");
+    flush();
+
+    delete [] OutBufStart;
+    OutBufStart = new char[Size];
+    OutBufEnd = OutBufStart+Size;
+    OutBufCur = OutBufStart;
+    Unbuffered = false;
+  }
+
+  /// SetUnbuffered - Set the streams buffering status. When
+  /// unbuffered the stream will flush after every write. This routine
+  /// will also flush the buffer immediately when the stream is being
+  /// set to unbuffered.
+  void SetUnbuffered() {
+    flush();
+    
+    delete [] OutBufStart;
+    OutBufStart = OutBufEnd = OutBufCur = 0;
+    Unbuffered = true;
+  }
+
+  unsigned GetNumBytesInBuffer() const {
+    return OutBufCur - OutBufStart;
+  }
+
+  //===--------------------------------------------------------------------===//
+  // Data Output Interface
+  //===--------------------------------------------------------------------===//
+
+  void flush() {
+    if (OutBufCur != OutBufStart)
+      flush_nonempty();
+  }
+
+  raw_ostream &operator<<(char C) {
+    if (OutBufCur >= OutBufEnd)
+      return write(C);
+    *OutBufCur++ = C;
+    return *this;
+  }
+
+  raw_ostream &operator<<(unsigned char C) {
+    if (OutBufCur >= OutBufEnd)
+      return write(C);
+    *OutBufCur++ = C;
+    return *this;
+  }
+
+  raw_ostream &operator<<(signed char C) {
+    if (OutBufCur >= OutBufEnd)
+      return write(C);
+    *OutBufCur++ = C;
+    return *this;
+  }
+
+  raw_ostream &operator<<(const char *Str) {
+    // Inline fast path, particulary for constant strings where a
+    // sufficiently smart compiler will simplify strlen.
+
+    unsigned Size = strlen(Str);
+
+    // Make sure we can use the fast path.
+    if (OutBufCur+Size > OutBufEnd)
+      return write(Str, Size);
+
+    memcpy(OutBufCur, Str, Size);
+    OutBufCur += Size;
+    return *this;
+  }
+
+  raw_ostream &operator<<(const std::string& Str) {
+    write(Str.data(), Str.length());
+    return *this;
+  }
+
+  raw_ostream &operator<<(unsigned long N);
+  raw_ostream &operator<<(long N);
+  raw_ostream &operator<<(unsigned long long N);
+  raw_ostream &operator<<(long long N);
+  raw_ostream &operator<<(const void *P);
+  raw_ostream &operator<<(unsigned int N) {
+    this->operator<<(static_cast<unsigned long>(N));
+    return *this;
+  }
+
+  raw_ostream &operator<<(int N) {
+    this->operator<<(static_cast<long>(N));
+    return *this;
+  }
+
+  raw_ostream &operator<<(double N) {
+    this->operator<<(ftostr(N));
+    return *this;
+  }
+
+  raw_ostream &write(unsigned char C);
+  raw_ostream &write(const char *Ptr, unsigned Size);
+
+  // Formatted output, see the format() function in Support/Format.h.
+  raw_ostream &operator<<(const format_object_base &Fmt);
+
+  //===--------------------------------------------------------------------===//
+  // Subclass Interface
+  //===--------------------------------------------------------------------===//
+
+private:
+  /// write_impl - The is the piece of the class that is implemented
+  /// by subclasses.  This writes the \args Size bytes starting at
+  /// \arg Ptr to the underlying stream.
+  /// 
+  /// \invariant { Size > 0 }
+  virtual void write_impl(const char *Ptr, unsigned Size) = 0;
+
+  // An out of line virtual method to provide a home for the class vtable.
+  virtual void handle();
+
+  /// current_pos - Return the current position within the stream, not
+  /// counting the bytes currently in the buffer.
+  virtual uint64_t current_pos() = 0;
+
+  //===--------------------------------------------------------------------===//
+  // Private Interface
+  //===--------------------------------------------------------------------===//
+private:
+  /// flush_nonempty - Flush the current buffer, which is known to be
+  /// non-empty. This outputs the currently buffered data and resets
+  /// the buffer to empty.
+  void flush_nonempty();
+};
+
+//===----------------------------------------------------------------------===//
+// File Output Streams
+//===----------------------------------------------------------------------===//
+
+/// raw_fd_ostream - A raw_ostream that writes to a file descriptor.
+///
+class raw_fd_ostream : public raw_ostream {
+  int FD;
+  bool ShouldClose;
+  uint64_t pos;
+
+  /// write_impl - See raw_ostream::write_impl.
+  virtual void write_impl(const char *Ptr, unsigned Size);
+
+  /// current_pos - Return the current position within the stream, not
+  /// counting the bytes currently in the buffer.
+  virtual uint64_t current_pos() { return pos; }
+
+public:
+  /// raw_fd_ostream - Open the specified file for writing. If an
+  /// error occurs, information about the error is put into ErrorInfo,
+  /// and the stream should be immediately destroyed; the string will
+  /// be empty if no error occurred.
+  ///
+  /// \param Filename - The file to open. If this is "-" then the
+  /// stream will use stdout instead.
+  /// \param Binary - The file should be opened in binary mode on
+  /// platforms that support this distinction.
+  raw_fd_ostream(const char *Filename, bool Binary, std::string &ErrorInfo);
+
+  /// raw_fd_ostream ctor - FD is the file descriptor that this writes to.  If
+  /// ShouldClose is true, this closes the file when the stream is destroyed.
+  raw_fd_ostream(int fd, bool shouldClose, 
+                 bool unbuffered=false) : raw_ostream(unbuffered), FD(fd), 
+                                          ShouldClose(shouldClose) {}
+  
+  ~raw_fd_ostream();
+
+  /// close - Manually flush the stream and close the file.
+  void close();
+
+  /// tell - Return the current offset with the file.
+  uint64_t tell() { return pos + GetNumBytesInBuffer(); }
+
+  /// seek - Flushes the stream and repositions the underlying file descriptor
+  ///  positition to the offset specified from the beginning of the file.
+  uint64_t seek(uint64_t off);
+};
+
+/// raw_stdout_ostream - This is a stream that always prints to stdout.
+///
+class raw_stdout_ostream : public raw_fd_ostream {
+  // An out of line virtual method to provide a home for the class vtable.
+  virtual void handle();
+public:
+  raw_stdout_ostream();
+};
+
+/// raw_stderr_ostream - This is a stream that always prints to stderr.
+///
+class raw_stderr_ostream : public raw_fd_ostream {
+  // An out of line virtual method to provide a home for the class vtable.
+  virtual void handle();
+public:
+  raw_stderr_ostream();
+};
+
+/// outs() - This returns a reference to a raw_ostream for standard output.
+/// Use it like: outs() << "foo" << "bar";
+raw_ostream &outs();
+
+/// errs() - This returns a reference to a raw_ostream for standard error.
+/// Use it like: errs() << "foo" << "bar";
+raw_ostream &errs();
+
+
+//===----------------------------------------------------------------------===//
+// Output Stream Adaptors
+//===----------------------------------------------------------------------===//
+
+/// raw_os_ostream - A raw_ostream that writes to an std::ostream.  This is a
+/// simple adaptor class.
+class raw_os_ostream : public raw_ostream {
+  std::ostream &OS;
+
+  /// write_impl - See raw_ostream::write_impl.
+  virtual void write_impl(const char *Ptr, unsigned Size);
+
+  /// current_pos - Return the current position within the stream, not
+  /// counting the bytes currently in the buffer.
+  virtual uint64_t current_pos();
+
+public:
+  raw_os_ostream(std::ostream &O) : OS(O) {}
+  ~raw_os_ostream();
+
+  /// tell - Return the current offset with the stream.
+  uint64_t tell();
+};
+
+/// raw_string_ostream - A raw_ostream that writes to an std::string.  This is a
+/// simple adaptor class.
+class raw_string_ostream : public raw_ostream {
+  std::string &OS;
+
+  /// write_impl - See raw_ostream::write_impl.
+  virtual void write_impl(const char *Ptr, unsigned Size);
+
+  /// current_pos - Return the current position within the stream, not
+  /// counting the bytes currently in the buffer.
+  virtual uint64_t current_pos() { return OS.size(); }
+public:
+  raw_string_ostream(std::string &O) : OS(O) {}
+  ~raw_string_ostream();
+
+  /// tell - Return the current offset with the stream.
+  uint64_t tell() { return OS.size() + GetNumBytesInBuffer(); }
+
+  /// str - Flushes the stream contents to the target string and returns
+  ///  the string's reference.
+  std::string& str() {
+    flush();
+    return OS;
+  }
+};
+
+/// raw_svector_ostream - A raw_ostream that writes to an SmallVector or
+/// SmallString.  This is a simple adaptor class.
+class raw_svector_ostream : public raw_ostream {
+  SmallVectorImpl<char> &OS;
+
+  /// write_impl - See raw_ostream::write_impl.
+  virtual void write_impl(const char *Ptr, unsigned Size);
+
+  /// current_pos - Return the current position within the stream, not
+  /// counting the bytes currently in the buffer.
+  virtual uint64_t current_pos();
+public:
+  raw_svector_ostream(SmallVectorImpl<char> &O) : OS(O) {}
+  ~raw_svector_ostream();
+
+  /// tell - Return the current offset with the stream.
+  uint64_t tell();
+};
+
+} // end llvm namespace
+
+#endif