X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FSupport%2Fraw_ostream.h;h=d5374d4447a691afc1a453b6b3aa57f2db7d1138;hb=a800215d54608bbe2d6adc918765c300217d97cb;hp=18bb31db76ea10dbf6ce463452f91ff81d92c8f3;hpb=d79637b940dfbcdc0b7c702d9655491ecca9d93d;p=oota-llvm.git

diff --git a/include/llvm/Support/raw_ostream.h b/include/llvm/Support/raw_ostream.h
index 18bb31db76e..d5374d4447a 100644
--- a/include/llvm/Support/raw_ostream.h
+++ b/include/llvm/Support/raw_ostream.h
@@ -14,23 +14,31 @@
 #ifndef LLVM_SUPPORT_RAW_OSTREAM_H
 #define LLVM_SUPPORT_RAW_OSTREAM_H
 
+#include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/DataTypes.h"
+#include <system_error>
 
 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
+class format_object_base;
+class FormattedString;
+class FormattedNumber;
+template <typename T> class SmallVectorImpl;
+
+namespace sys {
+namespace fs {
+enum OpenFlags : unsigned;
+}
+}
+
+/// 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:
-  // Do not implement. raw_ostream is noncopyable.
-  void operator=(const raw_ostream &);
-  raw_ostream(const raw_ostream &);
+  void operator=(const raw_ostream &) = delete;
+  raw_ostream(const raw_ostream &) = delete;
 
   /// The buffer is handled in such a way that the buffer is
   /// uninitialized, unbuffered, or out of space when OutBufCur >=
@@ -72,10 +80,10 @@ public:
     SAVEDCOLOR
   };
 
-  explicit raw_ostream(bool unbuffered=false)
-    : BufferMode(unbuffered ? Unbuffered : InternalBuffer) {
+  explicit raw_ostream(bool unbuffered = false)
+      : BufferMode(unbuffered ? Unbuffered : InternalBuffer) {
     // Start out ready to flush.
-    OutBufStart = OutBufEnd = OutBufCur = 0;
+    OutBufStart = OutBufEnd = OutBufCur = nullptr;
   }
 
   virtual ~raw_ostream();
@@ -87,12 +95,11 @@ public:
   // Configuration Interface
   //===--------------------------------------------------------------------===//
 
-  /// SetBuffered - Set the stream to be buffered, with an automatically
-  /// determined buffer size.
+  /// Set the stream to be buffered, with an automatically determined buffer
+  /// size.
   void SetBuffered();
 
-  /// SetBufferSize - Set the stream to be buffered, using the
-  /// specified buffer size.
+  /// Set the stream to be buffered, using the specified buffer size.
   void SetBufferSize(size_t Size) {
     flush();
     SetBufferAndMode(new char[Size], Size, InternalBuffer);
@@ -101,20 +108,19 @@ public:
   size_t GetBufferSize() const {
     // If we're supposed to be buffered but haven't actually gotten around
     // to allocating the buffer yet, return the value that would be used.
-    if (BufferMode != Unbuffered && OutBufStart == 0)
+    if (BufferMode != Unbuffered && OutBufStart == nullptr)
       return preferred_buffer_size();
 
     // Otherwise just return the size of the allocated buffer.
     return OutBufEnd - OutBufStart;
   }
 
-  /// SetUnbuffered - Set the stream to be unbuffered. 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.
+  /// Set the stream to be unbuffered. 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();
-    SetBufferAndMode(0, 0, Unbuffered);
+    SetBufferAndMode(nullptr, 0, Unbuffered);
   }
 
   size_t GetNumBytesInBuffer() const {
@@ -156,11 +162,13 @@ public:
     size_t Size = Str.size();
 
     // Make sure we can use the fast path.
-    if (OutBufCur+Size > OutBufEnd)
+    if (Size > (size_t)(OutBufEnd - OutBufCur))
       return write(Str.data(), Size);
 
-    memcpy(OutBufCur, Str.data(), Size);
-    OutBufCur += Size;
+    if (Size) {
+      memcpy(OutBufCur, Str.data(), Size);
+      OutBufCur += Size;
+    }
     return *this;
   }
 
@@ -176,6 +184,10 @@ public:
     return write(Str.data(), Str.length());
   }
 
+  raw_ostream &operator<<(const llvm::SmallVectorImpl<char> &Str) {
+    return write(Str.data(), Str.size());
+  }
+
   raw_ostream &operator<<(unsigned long N);
   raw_ostream &operator<<(long N);
   raw_ostream &operator<<(unsigned long long N);
@@ -191,11 +203,11 @@ public:
 
   raw_ostream &operator<<(double N);
 
-  /// write_hex - Output \arg N in hexadecimal, without any prefix or padding.
+  /// Output \p N in hexadecimal, without any prefix or padding.
   raw_ostream &write_hex(unsigned long long N);
 
-  /// write_escaped - Output \arg Str, turning '\\', '\t', '\n', '"', and
-  /// anything that doesn't satisfy std::isprint into an escape sequence.
+  /// Output \p Str, turning '\\', '\t', '\n', '"', and anything that doesn't
+  /// satisfy std::isprint into an escape sequence.
   raw_ostream &write_escaped(StringRef Str, bool UseHexEscapes = false);
 
   raw_ostream &write(unsigned char C);
@@ -204,25 +216,36 @@ public:
   // Formatted output, see the format() function in Support/Format.h.
   raw_ostream &operator<<(const format_object_base &Fmt);
 
+  // Formatted output, see the leftJustify() function in Support/Format.h.
+  raw_ostream &operator<<(const FormattedString &);
+
+  // Formatted output, see the formatHex() function in Support/Format.h.
+  raw_ostream &operator<<(const FormattedNumber &);
+
   /// indent - Insert 'NumSpaces' spaces.
   raw_ostream &indent(unsigned NumSpaces);
 
-
   /// Changes the foreground color of text that will be output from this point
   /// forward.
-  /// @param colors ANSI color to use, the special SAVEDCOLOR can be used to
+  /// @param Color ANSI color to use, the special SAVEDCOLOR can be used to
   /// change only the bold attribute, and keep colors untouched
-  /// @param bold bold/brighter text, default false
-  /// @param bg if true change the background, default: change foreground
+  /// @param Bold bold/brighter text, default false
+  /// @param BG if true change the background, default: change foreground
   /// @returns itself so it can be used within << invocations
-  virtual raw_ostream &changeColor(enum Colors, bool = false, bool = false) {
-    return *this; }
+  virtual raw_ostream &changeColor(enum Colors Color,
+                                   bool Bold = false,
+                                   bool BG = false) {
+    (void)Color;
+    (void)Bold;
+    (void)BG;
+    return *this;
+  }
 
   /// Resets the colors to terminal defaults. Call this when you are done
   /// outputting colored text, or before program exit.
   virtual raw_ostream &resetColor() { return *this; }
 
-  /// Reverses the forground and background colors.
+  /// Reverses the foreground and background colors.
   virtual raw_ostream &reverseColor() { return *this; }
 
   /// This function determines if this stream is connected to a "tty" or
@@ -238,16 +261,17 @@ public:
   //===--------------------------------------------------------------------===//
 
 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.
+  /// The is the piece of the class that is implemented by subclasses.  This
+  /// writes the \p Size bytes starting at
+  /// \p Ptr to the underlying stream.
   ///
   /// This function is guaranteed to only be called at a point at which it is
   /// safe for the subclass to install a new buffer via SetBuffer.
   ///
-  /// \arg Ptr - The start of the data to be written. For buffered streams this
+  /// \param Ptr The start of the data to be written. For buffered streams this
   /// is guaranteed to be the start of the buffer.
-  /// \arg Size - The number of bytes to be written.
+  ///
+  /// \param Size The number of bytes to be written.
   ///
   /// \invariant { Size > 0 }
   virtual void write_impl(const char *Ptr, size_t Size) = 0;
@@ -255,51 +279,69 @@ private:
   // 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.
+  /// Return the current position within the stream, not counting the bytes
+  /// currently in the buffer.
   virtual uint64_t current_pos() const = 0;
 
 protected:
-  /// SetBuffer - Use the provided buffer as the raw_ostream buffer. This is
-  /// intended for use only by subclasses which can arrange for the output to go
-  /// directly into the desired output buffer, instead of being copied on each
-  /// flush.
+  /// Use the provided buffer as the raw_ostream buffer. This is intended for
+  /// use only by subclasses which can arrange for the output to go directly
+  /// into the desired output buffer, instead of being copied on each flush.
   void SetBuffer(char *BufferStart, size_t Size) {
     SetBufferAndMode(BufferStart, Size, ExternalBuffer);
   }
 
-  /// preferred_buffer_size - Return an efficient buffer size for the
-  /// underlying output mechanism.
+  /// Return an efficient buffer size for the underlying output mechanism.
   virtual size_t preferred_buffer_size() const;
 
-  /// getBufferStart - Return the beginning of the current stream buffer, or 0
-  /// if the stream is unbuffered.
+  /// Return the beginning of the current stream buffer, or 0 if the stream is
+  /// unbuffered.
   const char *getBufferStart() const { return OutBufStart; }
 
   //===--------------------------------------------------------------------===//
   // Private Interface
   //===--------------------------------------------------------------------===//
 private:
-  /// SetBufferAndMode - Install the given buffer and mode.
+  /// Install the given buffer and mode.
   void SetBufferAndMode(char *BufferStart, size_t Size, BufferKind Mode);
 
-  /// 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.
+  /// 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();
 
-  /// copy_to_buffer - Copy data into the buffer. Size must not be
-  /// greater than the number of unused bytes in the buffer.
+  /// Copy data into the buffer. Size must not be greater than the number of
+  /// unused bytes in the buffer.
   void copy_to_buffer(const char *Ptr, size_t Size);
 };
 
+/// An abstract base class for streams implementations that also support a
+/// pwrite operation. This is useful for code that can mostly stream out data,
+/// but needs to patch in a header that needs to know the output size.
+class raw_pwrite_stream : public raw_ostream {
+  virtual void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) = 0;
+
+public:
+  explicit raw_pwrite_stream(bool Unbuffered = false)
+      : raw_ostream(Unbuffered) {}
+  void pwrite(const char *Ptr, size_t Size, uint64_t Offset) {
+#ifndef NDBEBUG
+    uint64_t Pos = tell();
+    // /dev/null always reports a pos of 0, so we cannot perform this check
+    // in that case.
+    if (Pos)
+      assert(Size + Offset <= Pos && "We don't support extending the stream");
+#endif
+    pwrite_impl(Ptr, Size, Offset);
+  }
+};
+
 //===----------------------------------------------------------------------===//
 // File Output Streams
 //===----------------------------------------------------------------------===//
 
-/// raw_fd_ostream - A raw_ostream that writes to a file descriptor.
+/// A raw_ostream that writes to a file descriptor.
 ///
-class raw_fd_ostream : public raw_ostream {
+class raw_fd_ostream : public raw_pwrite_stream {
   int FD;
   bool ShouldClose;
 
@@ -313,66 +355,55 @@ class raw_fd_ostream : public raw_ostream {
 
   uint64_t pos;
 
-  /// write_impl - See raw_ostream::write_impl.
-  virtual void write_impl(const char *Ptr, size_t Size);
-
-  /// current_pos - Return the current position within the stream, not
-  /// counting the bytes currently in the buffer.
-  virtual uint64_t current_pos() const { return pos; }
-
-  /// preferred_buffer_size - Determine an efficient buffer size.
-  virtual size_t preferred_buffer_size() const;
+  bool SupportsSeeking;
 
-  /// error_detected - Set the flag indicating that an output error has
-  /// been encountered.
-  void error_detected() { Error = true; }
+  /// See raw_ostream::write_impl.
+  void write_impl(const char *Ptr, size_t Size) override;
 
-public:
+  void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) override;
 
-  enum {
-    /// F_Excl - When opening a file, this flag makes raw_fd_ostream
-    /// report an error if the file already exists.
-    F_Excl  = 1,
+  /// Return the current position within the stream, not counting the bytes
+  /// currently in the buffer.
+  uint64_t current_pos() const override { return pos; }
 
-    /// F_Append - When opening a file, if it already exists append to the
-    /// existing file instead of returning an error.  This may not be specified
-    /// with F_Excl.
-    F_Append = 2,
+  /// Determine an efficient buffer size.
+  size_t preferred_buffer_size() const override;
 
-    /// F_Binary - The file should be opened in binary mode on platforms that
-    /// make this distinction.
-    F_Binary = 4
-  };
+  /// Set the flag indicating that an output error has been encountered.
+  void error_detected() { Error = true; }
 
-  /// 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.
-  /// This allows optional flags to control how the file will be opened.
+public:
+  /// Open the specified file for writing. If an error occurs, information
+  /// about the error is put into EC, and the stream should be immediately
+  /// destroyed;
+  /// \p Flags allows optional flags to control how the file will be opened.
   ///
   /// As a special case, if Filename is "-", then the stream will use
   /// STDOUT_FILENO instead of opening a file. Note that it will still consider
   /// itself to own the file descriptor. In particular, it will close the
   /// file descriptor when it is done (this is necessary to detect
   /// output errors).
-  raw_fd_ostream(const char *Filename, std::string &ErrorInfo,
-                 unsigned Flags = 0);
+  raw_fd_ostream(StringRef Filename, std::error_code &EC,
+                 sys::fs::OpenFlags Flags);
 
-  /// 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.
+  /// 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_fd_ostream();
+  ~raw_fd_ostream() override;
 
-  /// close - Manually flush the stream and close the file.
-  /// Note that this does not call fsync.
+  /// Manually flush the stream and close the file. Note that this does not call
+  /// fsync.
   void close();
 
-  /// seek - Flushes the stream and repositions the underlying file descriptor
-  /// position to the offset specified from the beginning of the file.
+  bool supportsSeeking() { return SupportsSeeking; }
+
+  /// Flushes the stream and repositions the underlying file descriptor position
+  /// to the offset specified from the beginning of the file.
   uint64_t seek(uint64_t off);
 
-  /// SetUseAtomicWrite - Set the stream to attempt to use atomic writes for
-  /// individual output routines where possible.
+  /// Set the stream to attempt to use atomic writes for individual output
+  /// routines where possible.
   ///
   /// Note that because raw_ostream's are typically buffered, this flag is only
   /// sensible when used on unbuffered streams which will flush their output
@@ -381,28 +412,28 @@ public:
     UseAtomicWrites = Value;
   }
 
-  virtual raw_ostream &changeColor(enum Colors colors, bool bold=false,
-                                   bool bg=false);
-  virtual raw_ostream &resetColor();
+  raw_ostream &changeColor(enum Colors colors, bool bold=false,
+                           bool bg=false) override;
+  raw_ostream &resetColor() override;
 
-  virtual raw_ostream &reverseColor();
+  raw_ostream &reverseColor() override;
 
-  virtual bool is_displayed() const;
+  bool is_displayed() const override;
 
-  virtual bool has_colors() const;
+  bool has_colors() const override;
 
-  /// has_error - Return the value of the flag in this raw_fd_ostream indicating
-  /// whether an output error has been encountered.
+  /// Return the value of the flag in this raw_fd_ostream indicating whether an
+  /// output error has been encountered.
   /// This doesn't implicitly flush any pending output.  Also, it doesn't
-  /// guarantee to detect all errors unless the the stream has been closed.
+  /// guarantee to detect all errors unless the stream has been closed.
   bool has_error() const {
     return Error;
   }
 
-  /// clear_error - Set the flag read by has_error() to false. If the error
-  /// flag is set at the time when this raw_ostream's destructor is called,
-  /// report_fatal_error is called to report the error. Use clear_error()
-  /// after handling the error to avoid this behavior.
+  /// Set the flag read by has_error() to false. If the error flag is set at the
+  /// time when this raw_ostream's destructor is called, report_fatal_error is
+  /// called to report the error. Use clear_error() after handling the error to
+  /// avoid this behavior.
   ///
   ///   "Errors should never pass silently.
   ///    Unless explicitly silenced."
@@ -413,87 +444,99 @@ public:
   }
 };
 
-/// outs() - This returns a reference to a raw_ostream for standard output.
-/// Use it like: outs() << "foo" << "bar";
+/// 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";
+/// This returns a reference to a raw_ostream for standard error. Use it like:
+/// errs() << "foo" << "bar";
 raw_ostream &errs();
 
-/// nulls() - This returns a reference to a raw_ostream which simply discards
-/// output.
+/// This returns a reference to a raw_ostream which simply discards output.
 raw_ostream &nulls();
 
 //===----------------------------------------------------------------------===//
 // Output Stream Adaptors
 //===----------------------------------------------------------------------===//
 
-/// raw_string_ostream - A raw_ostream that writes to an std::string.  This is a
-/// simple adaptor class. This class does not encounter output errors.
+/// A raw_ostream that writes to an std::string.  This is a simple adaptor
+/// class. This class does not encounter output errors.
 class raw_string_ostream : public raw_ostream {
   std::string &OS;
 
-  /// write_impl - See raw_ostream::write_impl.
-  virtual void write_impl(const char *Ptr, size_t Size);
+  /// See raw_ostream::write_impl.
+  void write_impl(const char *Ptr, size_t Size) override;
+
+  /// Return the current position within the stream, not counting the bytes
+  /// currently in the buffer.
+  uint64_t current_pos() const override { return OS.size(); }
 
-  /// current_pos - Return the current position within the stream, not
-  /// counting the bytes currently in the buffer.
-  virtual uint64_t current_pos() const { return OS.size(); }
 public:
   explicit raw_string_ostream(std::string &O) : OS(O) {}
-  ~raw_string_ostream();
+  ~raw_string_ostream() override;
 
-  /// str - Flushes the stream contents to the target string and returns
-  ///  the string's reference.
+  /// 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. This class does not
-/// encounter output errors.
-class raw_svector_ostream : public raw_ostream {
+/// A raw_ostream that writes to an SmallVector or SmallString.  This is a
+/// simple adaptor class. This class does not encounter output errors.
+/// raw_svector_ostream operates without a buffer, delegating all memory
+/// management to the SmallString. Thus the SmallString is always up-to-date,
+/// may be used directly and there is no need to call flush().
+class raw_svector_ostream : public raw_pwrite_stream {
   SmallVectorImpl<char> &OS;
 
-  /// write_impl - See raw_ostream::write_impl.
-  virtual void write_impl(const char *Ptr, size_t Size);
+  /// See raw_ostream::write_impl.
+  void write_impl(const char *Ptr, size_t Size) override;
+
+  void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) override;
+
+  /// Return the current position within the stream.
+  uint64_t current_pos() const override;
 
-  /// current_pos - Return the current position within the stream, not
-  /// counting the bytes currently in the buffer.
-  virtual uint64_t current_pos() const;
 public:
   /// Construct a new raw_svector_ostream.
   ///
-  /// \arg O - The vector to write to; this should generally have at least 128
+  /// \param O The vector to write to; this should generally have at least 128
   /// bytes free to avoid any extraneous memory overhead.
-  explicit raw_svector_ostream(SmallVectorImpl<char> &O);
-  ~raw_svector_ostream();
+  explicit raw_svector_ostream(SmallVectorImpl<char> &O) : OS(O) {
+    SetUnbuffered();
+  }
+  ~raw_svector_ostream() override {}
 
-  /// resync - This is called when the SmallVector we're appending to is changed
-  /// outside of the raw_svector_ostream's control.  It is only safe to do this
-  /// if the raw_svector_ostream has previously been flushed.
-  void resync();
+  void flush() = delete;
 
-  /// str - Flushes the stream contents to the target vector and return a
-  /// StringRef for the vector contents.
-  StringRef str();
+  /// Return a StringRef for the vector contents.
+  StringRef str() { return StringRef(OS.data(), OS.size()); }
 };
 
-/// raw_null_ostream - A raw_ostream that discards all output.
-class raw_null_ostream : public raw_ostream {
-  /// write_impl - See raw_ostream::write_impl.
-  virtual void write_impl(const char *Ptr, size_t size);
+/// A raw_ostream that discards all output.
+class raw_null_ostream : public raw_pwrite_stream {
+  /// See raw_ostream::write_impl.
+  void write_impl(const char *Ptr, size_t size) override;
+  void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) override;
 
-  /// current_pos - Return the current position within the stream, not
-  /// counting the bytes currently in the buffer.
-  virtual uint64_t current_pos() const;
+  /// Return the current position within the stream, not counting the bytes
+  /// currently in the buffer.
+  uint64_t current_pos() const override;
 
 public:
   explicit raw_null_ostream() {}
-  ~raw_null_ostream();
+  ~raw_null_ostream() override;
+};
+
+class buffer_ostream : public raw_svector_ostream {
+  raw_ostream &OS;
+  SmallVector<char, 0> Buffer;
+
+public:
+  buffer_ostream(raw_ostream &OS) : raw_svector_ostream(Buffer), OS(OS) {}
+  ~buffer_ostream() { OS << str(); }
 };
 
 } // end llvm namespace