mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-27 15:29:51 +00:00
Fixes pr23650. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241617 91177308-0d34-0410-b5e6-96231b3b80d8
553 lines
18 KiB
C++
553 lines
18 KiB
C++
//===--- 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/SmallVector.h"
|
|
#include "llvm/ADT/StringRef.h"
|
|
#include "llvm/Support/DataTypes.h"
|
|
#include <system_error>
|
|
|
|
namespace llvm {
|
|
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 &) = 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 >=
|
|
/// 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 (BufferMode == Unbuffered)
|
|
/// 1. Uninitialized (BufferMode != Unbuffered && OutBufStart == 0).
|
|
/// 2. Buffered (BufferMode != Unbuffered && OutBufStart != 0 &&
|
|
/// OutBufEnd - OutBufStart >= 1).
|
|
///
|
|
/// If buffered, then the raw_ostream owns the buffer if (BufferMode ==
|
|
/// InternalBuffer); otherwise the buffer has been set via SetBuffer and is
|
|
/// managed by the subclass.
|
|
///
|
|
/// If a subclass installs an external buffer using SetBuffer then it can wait
|
|
/// for a \see write_impl() call to handle the data which has been put into
|
|
/// this buffer.
|
|
char *OutBufStart, *OutBufEnd, *OutBufCur;
|
|
|
|
enum BufferKind {
|
|
Unbuffered = 0,
|
|
InternalBuffer,
|
|
ExternalBuffer
|
|
} BufferMode;
|
|
|
|
public:
|
|
// color order matches ANSI escape sequence, don't change
|
|
enum Colors {
|
|
BLACK=0,
|
|
RED,
|
|
GREEN,
|
|
YELLOW,
|
|
BLUE,
|
|
MAGENTA,
|
|
CYAN,
|
|
WHITE,
|
|
SAVEDCOLOR
|
|
};
|
|
|
|
explicit raw_ostream(bool unbuffered = false)
|
|
: BufferMode(unbuffered ? Unbuffered : InternalBuffer) {
|
|
// Start out ready to flush.
|
|
OutBufStart = OutBufEnd = OutBufCur = nullptr;
|
|
}
|
|
|
|
virtual ~raw_ostream();
|
|
|
|
/// tell - Return the current offset with the file.
|
|
uint64_t tell() const { return current_pos() + GetNumBytesInBuffer(); }
|
|
|
|
//===--------------------------------------------------------------------===//
|
|
// Configuration Interface
|
|
//===--------------------------------------------------------------------===//
|
|
|
|
/// Set the stream to be buffered, with an automatically determined buffer
|
|
/// size.
|
|
void SetBuffered();
|
|
|
|
/// Set the stream to be buffered, using the specified buffer size.
|
|
void SetBufferSize(size_t Size) {
|
|
flush();
|
|
SetBufferAndMode(new char[Size], Size, InternalBuffer);
|
|
}
|
|
|
|
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 == nullptr)
|
|
return preferred_buffer_size();
|
|
|
|
// Otherwise just return the size of the allocated buffer.
|
|
return OutBufEnd - OutBufStart;
|
|
}
|
|
|
|
/// 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);
|
|
}
|
|
|
|
size_t 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<<(StringRef Str) {
|
|
// Inline fast path, particularly for strings with a known length.
|
|
size_t Size = Str.size();
|
|
|
|
// Make sure we can use the fast path.
|
|
if (Size > (size_t)(OutBufEnd - OutBufCur))
|
|
return write(Str.data(), Size);
|
|
|
|
if (Size) {
|
|
memcpy(OutBufCur, Str.data(), Size);
|
|
OutBufCur += Size;
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
raw_ostream &operator<<(const char *Str) {
|
|
// Inline fast path, particularly for constant strings where a sufficiently
|
|
// smart compiler will simplify strlen.
|
|
|
|
return this->operator<<(StringRef(Str));
|
|
}
|
|
|
|
raw_ostream &operator<<(const std::string &Str) {
|
|
// Avoid the fast path, it would only increase code size for a marginal win.
|
|
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<<(long long N);
|
|
raw_ostream &operator<<(const void *P);
|
|
raw_ostream &operator<<(unsigned int N) {
|
|
return this->operator<<(static_cast<unsigned long>(N));
|
|
}
|
|
|
|
raw_ostream &operator<<(int N) {
|
|
return this->operator<<(static_cast<long>(N));
|
|
}
|
|
|
|
raw_ostream &operator<<(double N);
|
|
|
|
/// Output \p N in hexadecimal, without any prefix or padding.
|
|
raw_ostream &write_hex(unsigned long long N);
|
|
|
|
/// 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);
|
|
raw_ostream &write(const char *Ptr, size_t Size);
|
|
|
|
// 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
|
|
/// 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
|
|
/// @returns itself so it can be used within << invocations
|
|
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.
|
|
virtual raw_ostream &reverseColor() { return *this; }
|
|
|
|
/// This function determines if this stream is connected to a "tty" or
|
|
/// "console" window. That is, the output would be displayed to the user
|
|
/// rather than being put on a pipe or stored in a file.
|
|
virtual bool is_displayed() const { return false; }
|
|
|
|
/// This function determines if this stream is displayed and supports colors.
|
|
virtual bool has_colors() const { return is_displayed(); }
|
|
|
|
//===--------------------------------------------------------------------===//
|
|
// Subclass Interface
|
|
//===--------------------------------------------------------------------===//
|
|
|
|
private:
|
|
/// 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.
|
|
///
|
|
/// \param Ptr The start of the data to be written. For buffered streams this
|
|
/// is guaranteed to be the start of the buffer.
|
|
///
|
|
/// \param Size The number of bytes to be written.
|
|
///
|
|
/// \invariant { Size > 0 }
|
|
virtual void write_impl(const char *Ptr, size_t Size) = 0;
|
|
|
|
// An out of line virtual method to provide a home for the class vtable.
|
|
virtual void handle();
|
|
|
|
/// Return the current position within the stream, not counting the bytes
|
|
/// currently in the buffer.
|
|
virtual uint64_t current_pos() const = 0;
|
|
|
|
protected:
|
|
/// 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);
|
|
}
|
|
|
|
/// Return an efficient buffer size for the underlying output mechanism.
|
|
virtual size_t preferred_buffer_size() const;
|
|
|
|
/// Return the beginning of the current stream buffer, or 0 if the stream is
|
|
/// unbuffered.
|
|
const char *getBufferStart() const { return OutBufStart; }
|
|
|
|
//===--------------------------------------------------------------------===//
|
|
// Private Interface
|
|
//===--------------------------------------------------------------------===//
|
|
private:
|
|
/// Install the given buffer and mode.
|
|
void SetBufferAndMode(char *BufferStart, size_t Size, BufferKind Mode);
|
|
|
|
/// 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 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 usefull 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
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// A raw_ostream that writes to a file descriptor.
|
|
///
|
|
class raw_fd_ostream : public raw_pwrite_stream {
|
|
int FD;
|
|
bool ShouldClose;
|
|
|
|
/// Error This flag is true if an error of any kind has been detected.
|
|
///
|
|
bool Error;
|
|
|
|
/// Controls whether the stream should attempt to use atomic writes, when
|
|
/// possible.
|
|
bool UseAtomicWrites;
|
|
|
|
uint64_t pos;
|
|
|
|
bool SupportsSeeking;
|
|
|
|
/// 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, not counting the bytes
|
|
/// currently in the buffer.
|
|
uint64_t current_pos() const override { return pos; }
|
|
|
|
/// Determine an efficient buffer size.
|
|
size_t preferred_buffer_size() const override;
|
|
|
|
/// Set the flag indicating that an output error has been encountered.
|
|
void error_detected() { Error = true; }
|
|
|
|
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(StringRef Filename, std::error_code &EC,
|
|
sys::fs::OpenFlags Flags);
|
|
|
|
/// 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() override;
|
|
|
|
/// Manually flush the stream and close the file. Note that this does not call
|
|
/// fsync.
|
|
void close();
|
|
|
|
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);
|
|
|
|
/// 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;
|
|
}
|
|
|
|
raw_ostream &changeColor(enum Colors colors, bool bold=false,
|
|
bool bg=false) override;
|
|
raw_ostream &resetColor() override;
|
|
|
|
raw_ostream &reverseColor() override;
|
|
|
|
bool is_displayed() const override;
|
|
|
|
bool has_colors() const override;
|
|
|
|
/// 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;
|
|
}
|
|
|
|
/// 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."
|
|
/// - from The Zen of Python, by Tim Peters
|
|
///
|
|
void clear_error() {
|
|
Error = false;
|
|
}
|
|
};
|
|
|
|
/// This returns a reference to a raw_ostream for standard output. Use it like:
|
|
/// outs() << "foo" << "bar";
|
|
raw_ostream &outs();
|
|
|
|
/// This returns a reference to a raw_ostream for standard error. Use it like:
|
|
/// errs() << "foo" << "bar";
|
|
raw_ostream &errs();
|
|
|
|
/// This returns a reference to a raw_ostream which simply discards output.
|
|
raw_ostream &nulls();
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Output Stream Adaptors
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// 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;
|
|
|
|
/// 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(); }
|
|
public:
|
|
explicit raw_string_ostream(std::string &O) : OS(O) {}
|
|
~raw_string_ostream() override;
|
|
|
|
/// Flushes the stream contents to the target string and returns the string's
|
|
/// reference.
|
|
std::string& str() {
|
|
flush();
|
|
return OS;
|
|
}
|
|
};
|
|
|
|
/// 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_pwrite_stream {
|
|
SmallVectorImpl<char> &OS;
|
|
|
|
/// 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, not counting the bytes
|
|
/// currently in the buffer.
|
|
uint64_t current_pos() const override;
|
|
|
|
protected:
|
|
// Like the regular constructor, but doesn't call init.
|
|
explicit raw_svector_ostream(SmallVectorImpl<char> &O, unsigned);
|
|
void init();
|
|
|
|
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() override;
|
|
|
|
|
|
/// 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();
|
|
|
|
/// Flushes the stream contents to the target vector and return a StringRef
|
|
/// for the vector contents.
|
|
StringRef str();
|
|
};
|
|
|
|
/// 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;
|
|
|
|
/// 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() 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, 0), OS(OS) {
|
|
init();
|
|
}
|
|
~buffer_ostream() { OS << str(); }
|
|
};
|
|
|
|
} // end llvm namespace
|
|
|
|
#endif
|