#ifndef LLVM_SUPPORT_RAW_OSTREAM_H
#define LLVM_SUPPORT_RAW_OSTREAM_H
-#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/SmallVector.h"
-#include "llvm/Support/Compiler.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;
-
- namespace sys {
- namespace fs {
- enum OpenFlags : unsigned;
- }
- }
-
-/// 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:
- void operator=(const raw_ostream &) LLVM_DELETED_FUNCTION;
- raw_ostream(const raw_ostream &) LLVM_DELETED_FUNCTION;
+ 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 >=
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 = nullptr;
}
// 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);
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(nullptr, 0, Unbuffered);
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;
}
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);
raw_ostream &operator<<(double N);
- /// write_hex - Output \p 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 \p 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);
// 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 Color ANSI color to use, the special SAVEDCOLOR can be used to
/// 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
//===--------------------------------------------------------------------===//
private:
- /// write_impl - The is the piece of the class that is implemented
- /// by subclasses. This writes the \p Size bytes starting at
+ /// 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
// 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;
///
bool Error;
- /// Controls whether the stream should attempt to use atomic writes, when
- /// possible.
- bool UseAtomicWrites;
-
uint64_t pos;
- /// write_impl - See raw_ostream::write_impl.
+ bool SupportsSeeking;
+
+ /// See raw_ostream::write_impl.
void write_impl(const char *Ptr, size_t Size) override;
- /// current_pos - Return the current position within the stream, not
- /// counting the bytes currently in the buffer.
+ void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) override;
+
+ /// Return the current position within the stream, not counting the bytes
+ /// currently in the buffer.
uint64_t current_pos() const override { return pos; }
- /// preferred_buffer_size - Determine an efficient buffer size.
+ /// Determine an efficient buffer size.
size_t preferred_buffer_size() const override;
- /// error_detected - Set the flag indicating that an output error has
- /// been encountered.
+ /// Set the flag indicating that an output error has been encountered.
void error_detected() { Error = true; }
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.
- /// This allows optional flags to control how the file will be opened.
+ /// 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,
+ 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.
- uint64_t seek(uint64_t off);
+ bool supportsSeeking() { return SupportsSeeking; }
- /// SetUseAtomicWrite - 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
- /// immediately.
- void SetUseAtomicWrites(bool Value) {
- UseAtomicWrites = Value;
- }
+ /// 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);
raw_ostream &changeColor(enum Colors colors, bool bold=false,
bool bg=false) override;
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 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."
}
};
-/// 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.
+ /// See raw_ostream::write_impl.
void write_impl(const char *Ptr, size_t Size) override;
- /// 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.
uint64_t current_pos() const override { 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.
+ /// See raw_ostream::write_impl.
void write_impl(const char *Ptr, size_t Size) override;
- /// current_pos - Return the current position within the stream, not
- /// counting the bytes currently in the buffer.
- uint64_t current_pos() const override;
+ void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) override;
-protected:
- // This constructor is specified not to access \p O provided for storage as it
- // may not yet be initialized at construction time.
- explicit raw_svector_ostream(SmallVectorImpl<char> &O, std::nullptr_t)
- : OS(O){};
- void init();
+ /// Return the current position within the stream.
+ uint64_t current_pos() const override;
public:
/// Construct a new raw_svector_ostream.
///
/// \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.
+/// 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.
+ /// 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;
};
-/// string_ostream - A raw_ostream that builds a string. This is a
-/// raw_svector_ostream with storage.
-template <unsigned InternalLen>
-class small_string_ostream : public raw_svector_ostream {
- SmallVector<char, InternalLen> Buffer;
- // There's no need to flush explicitly.
- using raw_svector_ostream::flush;
+class buffer_ostream : public raw_svector_ostream {
+ raw_ostream &OS;
+ SmallVector<char, 0> Buffer;
public:
- small_string_ostream() : raw_svector_ostream(Buffer, nullptr) { init(); }
-
- void clear() {
- flush();
- Buffer.clear();
- }
+ buffer_ostream(raw_ostream &OS) : raw_svector_ostream(Buffer), OS(OS) {}
+ ~buffer_ostream() override { OS << str(); }
};
-typedef small_string_ostream<128> string_ostream;
-
} // end llvm namespace
-#endif
+#endif // LLVM_SUPPORT_RAW_OSTREAM_H