X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FSupport%2Fraw_ostream.h;h=34fbe082cda804178647039e0d00b9c30f6bd048;hb=c92330c18ce2f7015f0db88e4bfce3d253fa3c57;hp=58253dd730c92fb04b557e4db1528583bdc57bf7;hpb=8a719291db4cd209a7fa2b320f5f83462a2c487f;p=oota-llvm.git diff --git a/include/llvm/Support/raw_ostream.h b/include/llvm/Support/raw_ostream.h index 58253dd730c..34fbe082cda 100644 --- a/include/llvm/Support/raw_ostream.h +++ b/include/llvm/Support/raw_ostream.h @@ -15,6 +15,7 @@ #define LLVM_SUPPORT_RAW_OSTREAM_H #include "llvm/ADT/StringRef.h" +#include "llvm/Support/Compiler.h" #include "llvm/Support/DataTypes.h" namespace llvm { @@ -22,15 +23,20 @@ namespace llvm { template 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 /// 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 &) LLVM_DELETED_FUNCTION; + raw_ostream(const raw_ostream &) LLVM_DELETED_FUNCTION; /// The buffer is handled in such a way that the buffer is /// uninitialized, unbuffered, or out of space when OutBufCur >= @@ -41,7 +47,7 @@ private: /// 1. Unbuffered (BufferMode == Unbuffered) /// 1. Uninitialized (BufferMode != Unbuffered && OutBufStart == 0). /// 2. Buffered (BufferMode != Unbuffered && OutBufStart != 0 && - /// OutBufEnd - OutBufStart >= 64). + /// 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 @@ -51,17 +57,13 @@ private: /// 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; - /// Error This flag is true if an error of any kind has been detected. - /// - bool Error; - public: // color order matches ANSI escape sequence, don't change enum Colors { @@ -77,29 +79,15 @@ public: }; explicit raw_ostream(bool unbuffered=false) - : BufferMode(unbuffered ? Unbuffered : InternalBuffer), Error(false) { + : BufferMode(unbuffered ? Unbuffered : InternalBuffer) { // Start out ready to flush. - OutBufStart = OutBufEnd = OutBufCur = 0; + OutBufStart = OutBufEnd = OutBufCur = nullptr; } virtual ~raw_ostream(); /// tell - Return the current offset with the file. - uint64_t tell() { return current_pos() + GetNumBytesInBuffer(); } - - /// has_error - Return the value of the flag in this raw_ostream indicating - /// whether an output error has been encountered. - 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, - /// llvm_report_error is called to report the error. Use clear_error() - /// after handling the error to avoid this behavior. - void clear_error() { - Error = false; - } + uint64_t tell() const { return current_pos() + GetNumBytesInBuffer(); } //===--------------------------------------------------------------------===// // Configuration Interface @@ -116,10 +104,10 @@ public: SetBufferAndMode(new char[Size], Size, InternalBuffer); } - size_t GetBufferSize() { + 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. @@ -132,7 +120,7 @@ public: /// set to unbuffered. void SetUnbuffered() { flush(); - SetBufferAndMode(0, 0, Unbuffered); + SetBufferAndMode(nullptr, 0, Unbuffered); } size_t GetNumBytesInBuffer() const { @@ -169,12 +157,12 @@ public: return *this; } - raw_ostream &operator<<(const StringRef &Str) { + 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 (OutBufCur+Size > OutBufEnd) + if (Size > (size_t)(OutBufEnd - OutBufCur)) return write(Str.data(), Size); memcpy(OutBufCur, Str.data(), Size); @@ -183,17 +171,15 @@ public: } raw_ostream &operator<<(const char *Str) { - // Inline fast path, particulary for constant strings where a sufficiently + // Inline fast path, particularly for constant strings where a sufficiently // smart compiler will simplify strlen. - this->operator<<(StringRef(Str)); - return *this; + 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. - write(Str.data(), Str.length()); - return *this; + return write(Str.data(), Str.length()); } raw_ostream &operator<<(unsigned long N); @@ -202,20 +188,22 @@ public: raw_ostream &operator<<(long long N); raw_ostream &operator<<(const void *P); raw_ostream &operator<<(unsigned int N) { - this->operator<<(static_cast(N)); - return *this; + return this->operator<<(static_cast(N)); } raw_ostream &operator<<(int N) { - this->operator<<(static_cast(N)); - return *this; + return this->operator<<(static_cast(N)); } - raw_ostream &operator<<(double N); + raw_ostream &operator<<(double N); - /// write_hex - Output \arg N in hexadecimal, without any prefix or padding. + /// write_hex - 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. + raw_ostream &write_escaped(StringRef Str, bool UseHexEscapes = false); + raw_ostream &write(unsigned char C); raw_ostream &write(const char *Ptr, size_t Size); @@ -224,37 +212,55 @@ public: /// 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 colors, bool bold=false, - bool bg=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. + 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: /// 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. - /// + /// 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; @@ -264,7 +270,7 @@ private: /// current_pos - Return the current position within the stream, not /// counting the bytes currently in the buffer. - virtual uint64_t current_pos() = 0; + virtual uint64_t current_pos() const = 0; protected: /// SetBuffer - Use the provided buffer as the raw_ostream buffer. This is @@ -277,11 +283,7 @@ protected: /// preferred_buffer_size - Return an efficient buffer size for the /// underlying output mechanism. - virtual size_t preferred_buffer_size(); - - /// error_detected - Set the flag indicating that an output error has - /// been encountered. - void error_detected() { Error = true; } + virtual size_t preferred_buffer_size() const; /// getBufferStart - Return the beginning of the current stream buffer, or 0 /// if the stream is unbuffered. @@ -313,82 +315,99 @@ private: class raw_fd_ostream : public raw_ostream { 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; /// write_impl - See raw_ostream::write_impl. - virtual void write_impl(const char *Ptr, size_t Size); + 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. - virtual uint64_t current_pos() { return pos; } + uint64_t current_pos() const override { return pos; } /// preferred_buffer_size - Determine an efficient buffer size. - virtual size_t preferred_buffer_size(); + size_t preferred_buffer_size() const override; + + /// error_detected - Set the flag indicating that an output error has + /// been encountered. + void error_detected() { Error = true; } public: - - enum { - /// F_Force - When opening a file, this flag makes raw_fd_ostream overwrite - /// a file if it already exists instead of emitting an error. This may not - /// be specified with F_Append. - F_Force = 1, - - /// 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_Force. - F_Append = 2, - - /// F_Binary - The file should be opened in binary mode on platforms that - /// support this distinction. - F_Binary = 4 - }; - /// 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. /// - /// \param Filename - The file to open. If this is "-" then the - /// stream will use stdout instead. + /// 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); + 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. - raw_fd_ostream(int fd, bool shouldClose, - bool unbuffered=false) : raw_ostream(unbuffered), FD(fd), - ShouldClose(shouldClose) {} - + raw_fd_ostream(int fd, bool shouldClose, bool unbuffered=false); + ~raw_fd_ostream(); /// close - 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 - /// positition to the offset specified from the beginning of the file. + /// position to the offset specified from the beginning of the file. uint64_t seek(uint64_t off); - virtual raw_ostream &changeColor(enum Colors colors, bool bold=false, - bool bg=false); - virtual raw_ostream &resetColor(); -}; + /// 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; + } -/// 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_ostream &changeColor(enum Colors colors, bool bold=false, + bool bg=false) override; + raw_ostream &resetColor() override; -/// 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(); + raw_ostream &reverseColor() override; + + bool is_displayed() const 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. + /// 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. + /// + /// "Errors should never pass silently. + /// Unless explicitly silenced." + /// - from The Zen of Python, by Tim Peters + /// + void clear_error() { + Error = false; + } }; /// outs() - This returns a reference to a raw_ostream for standard output. @@ -413,11 +432,11 @@ 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); + 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. - virtual uint64_t current_pos() { return OS.size(); } + uint64_t current_pos() const override { return OS.size(); } public: explicit raw_string_ostream(std::string &O) : OS(O) {} ~raw_string_ostream(); @@ -437,19 +456,24 @@ class raw_svector_ostream : public raw_ostream { SmallVectorImpl &OS; /// write_impl - See raw_ostream::write_impl. - virtual void write_impl(const char *Ptr, size_t Size); + 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. - virtual uint64_t current_pos(); + uint64_t current_pos() const override; 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 &O); ~raw_svector_ostream(); + /// 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(); + /// str - Flushes the stream contents to the target vector and return a /// StringRef for the vector contents. StringRef str(); @@ -458,11 +482,11 @@ public: /// 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); - + 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. - virtual uint64_t current_pos(); + uint64_t current_pos() const override; public: explicit raw_null_ostream() {}