| //===--- raw_ostream.cpp - Implement the raw_ostream classes --------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This implements support for bulk buffered stream output. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/Support/raw_ostream.h" |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/Config/config.h" |
| #include "llvm/Support/Compiler.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/Support/FileSystem.h" |
| #include "llvm/Support/Format.h" |
| #include "llvm/Support/FormatVariadic.h" |
| #include "llvm/Support/MathExtras.h" |
| #include "llvm/Support/NativeFormatting.h" |
| #include "llvm/Support/Process.h" |
| #include "llvm/Support/Program.h" |
| #include <algorithm> |
| #include <cctype> |
| #include <cerrno> |
| #include <cstdio> |
| #include <iterator> |
| #include <sys/stat.h> |
| |
| // <fcntl.h> may provide O_BINARY. |
| #if defined(HAVE_FCNTL_H) |
| # include <fcntl.h> |
| #endif |
| |
| #if defined(HAVE_UNISTD_H) |
| # include <unistd.h> |
| #endif |
| |
| #if defined(__CYGWIN__) |
| #include <io.h> |
| #endif |
| |
| #if defined(_MSC_VER) |
| #include <io.h> |
| #ifndef STDIN_FILENO |
| # define STDIN_FILENO 0 |
| #endif |
| #ifndef STDOUT_FILENO |
| # define STDOUT_FILENO 1 |
| #endif |
| #ifndef STDERR_FILENO |
| # define STDERR_FILENO 2 |
| #endif |
| #endif |
| |
| #ifdef _WIN32 |
| #include "llvm/Support/ConvertUTF.h" |
| #include "llvm/Support/Windows/WindowsSupport.h" |
| #endif |
| |
| using namespace llvm; |
| |
| constexpr raw_ostream::Colors raw_ostream::BLACK; |
| constexpr raw_ostream::Colors raw_ostream::RED; |
| constexpr raw_ostream::Colors raw_ostream::GREEN; |
| constexpr raw_ostream::Colors raw_ostream::YELLOW; |
| constexpr raw_ostream::Colors raw_ostream::BLUE; |
| constexpr raw_ostream::Colors raw_ostream::MAGENTA; |
| constexpr raw_ostream::Colors raw_ostream::CYAN; |
| constexpr raw_ostream::Colors raw_ostream::WHITE; |
| constexpr raw_ostream::Colors raw_ostream::SAVEDCOLOR; |
| constexpr raw_ostream::Colors raw_ostream::RESET; |
| |
| raw_ostream::~raw_ostream() { |
| // raw_ostream's subclasses should take care to flush the buffer |
| // in their destructors. |
| assert(OutBufCur == OutBufStart && |
| "raw_ostream destructor called with non-empty buffer!"); |
| |
| if (BufferMode == BufferKind::InternalBuffer) |
| delete [] OutBufStart; |
| } |
| |
| size_t raw_ostream::preferred_buffer_size() const { |
| // BUFSIZ is intended to be a reasonable default. |
| return BUFSIZ; |
| } |
| |
| void raw_ostream::SetBuffered() { |
| // Ask the subclass to determine an appropriate buffer size. |
| if (size_t Size = preferred_buffer_size()) |
| SetBufferSize(Size); |
| else |
| // It may return 0, meaning this stream should be unbuffered. |
| SetUnbuffered(); |
| } |
| |
| void raw_ostream::SetBufferAndMode(char *BufferStart, size_t Size, |
| BufferKind Mode) { |
| assert(((Mode == BufferKind::Unbuffered && !BufferStart && Size == 0) || |
| (Mode != BufferKind::Unbuffered && BufferStart && Size != 0)) && |
| "stream must be unbuffered or have at least one byte"); |
| // Make sure the current buffer is free of content (we can't flush here; the |
| // child buffer management logic will be in write_impl). |
| assert(GetNumBytesInBuffer() == 0 && "Current buffer is non-empty!"); |
| |
| if (BufferMode == BufferKind::InternalBuffer) |
| delete [] OutBufStart; |
| OutBufStart = BufferStart; |
| OutBufEnd = OutBufStart+Size; |
| OutBufCur = OutBufStart; |
| BufferMode = Mode; |
| |
| assert(OutBufStart <= OutBufEnd && "Invalid size!"); |
| } |
| |
| raw_ostream &raw_ostream::operator<<(unsigned long N) { |
| write_integer(*this, static_cast<uint64_t>(N), 0, IntegerStyle::Integer); |
| return *this; |
| } |
| |
| raw_ostream &raw_ostream::operator<<(long N) { |
| write_integer(*this, static_cast<int64_t>(N), 0, IntegerStyle::Integer); |
| return *this; |
| } |
| |
| raw_ostream &raw_ostream::operator<<(unsigned long long N) { |
| write_integer(*this, static_cast<uint64_t>(N), 0, IntegerStyle::Integer); |
| return *this; |
| } |
| |
| raw_ostream &raw_ostream::operator<<(long long N) { |
| write_integer(*this, static_cast<int64_t>(N), 0, IntegerStyle::Integer); |
| return *this; |
| } |
| |
| raw_ostream &raw_ostream::write_hex(unsigned long long N) { |
| llvm::write_hex(*this, N, HexPrintStyle::Lower); |
| return *this; |
| } |
| |
| raw_ostream &raw_ostream::operator<<(Colors C) { |
| if (C == Colors::RESET) |
| resetColor(); |
| else |
| changeColor(C); |
| return *this; |
| } |
| |
| raw_ostream &raw_ostream::write_uuid(const uuid_t UUID) { |
| for (int Idx = 0; Idx < 16; ++Idx) { |
| *this << format("%02" PRIX32, UUID[Idx]); |
| if (Idx == 3 || Idx == 5 || Idx == 7 || Idx == 9) |
| *this << "-"; |
| } |
| return *this; |
| } |
| |
| |
| raw_ostream &raw_ostream::write_escaped(StringRef Str, |
| bool UseHexEscapes) { |
| for (unsigned char c : Str) { |
| switch (c) { |
| case '\\': |
| *this << '\\' << '\\'; |
| break; |
| case '\t': |
| *this << '\\' << 't'; |
| break; |
| case '\n': |
| *this << '\\' << 'n'; |
| break; |
| case '"': |
| *this << '\\' << '"'; |
| break; |
| default: |
| if (isPrint(c)) { |
| *this << c; |
| break; |
| } |
| |
| // Write out the escaped representation. |
| if (UseHexEscapes) { |
| *this << '\\' << 'x'; |
| *this << hexdigit((c >> 4) & 0xF); |
| *this << hexdigit((c >> 0) & 0xF); |
| } else { |
| // Always use a full 3-character octal escape. |
| *this << '\\'; |
| *this << char('0' + ((c >> 6) & 7)); |
| *this << char('0' + ((c >> 3) & 7)); |
| *this << char('0' + ((c >> 0) & 7)); |
| } |
| } |
| } |
| |
| return *this; |
| } |
| |
| raw_ostream &raw_ostream::operator<<(const void *P) { |
| llvm::write_hex(*this, (uintptr_t)P, HexPrintStyle::PrefixLower); |
| return *this; |
| } |
| |
| raw_ostream &raw_ostream::operator<<(double N) { |
| llvm::write_double(*this, N, FloatStyle::Exponent); |
| return *this; |
| } |
| |
| void raw_ostream::flush_nonempty() { |
| assert(OutBufCur > OutBufStart && "Invalid call to flush_nonempty."); |
| size_t Length = OutBufCur - OutBufStart; |
| OutBufCur = OutBufStart; |
| flush_tied_then_write(OutBufStart, Length); |
| } |
| |
| raw_ostream &raw_ostream::write(unsigned char C) { |
| // Group exceptional cases into a single branch. |
| if (LLVM_UNLIKELY(OutBufCur >= OutBufEnd)) { |
| if (LLVM_UNLIKELY(!OutBufStart)) { |
| if (BufferMode == BufferKind::Unbuffered) { |
| flush_tied_then_write(reinterpret_cast<char *>(&C), 1); |
| return *this; |
| } |
| // Set up a buffer and start over. |
| SetBuffered(); |
| return write(C); |
| } |
| |
| flush_nonempty(); |
| } |
| |
| *OutBufCur++ = C; |
| return *this; |
| } |
| |
| raw_ostream &raw_ostream::write(const char *Ptr, size_t Size) { |
| // Group exceptional cases into a single branch. |
| if (LLVM_UNLIKELY(size_t(OutBufEnd - OutBufCur) < Size)) { |
| if (LLVM_UNLIKELY(!OutBufStart)) { |
| if (BufferMode == BufferKind::Unbuffered) { |
| flush_tied_then_write(Ptr, Size); |
| return *this; |
| } |
| // Set up a buffer and start over. |
| SetBuffered(); |
| return write(Ptr, Size); |
| } |
| |
| size_t NumBytes = OutBufEnd - OutBufCur; |
| |
| // If the buffer is empty at this point we have a string that is larger |
| // than the buffer. Directly write the chunk that is a multiple of the |
| // preferred buffer size and put the remainder in the buffer. |
| if (LLVM_UNLIKELY(OutBufCur == OutBufStart)) { |
| assert(NumBytes != 0 && "undefined behavior"); |
| size_t BytesToWrite = Size - (Size % NumBytes); |
| flush_tied_then_write(Ptr, BytesToWrite); |
| size_t BytesRemaining = Size - BytesToWrite; |
| if (BytesRemaining > size_t(OutBufEnd - OutBufCur)) { |
| // Too much left over to copy into our buffer. |
| return write(Ptr + BytesToWrite, BytesRemaining); |
| } |
| copy_to_buffer(Ptr + BytesToWrite, BytesRemaining); |
| return *this; |
| } |
| |
| // We don't have enough space in the buffer to fit the string in. Insert as |
| // much as possible, flush and start over with the remainder. |
| copy_to_buffer(Ptr, NumBytes); |
| flush_nonempty(); |
| return write(Ptr + NumBytes, Size - NumBytes); |
| } |
| |
| copy_to_buffer(Ptr, Size); |
| |
| return *this; |
| } |
| |
| void raw_ostream::copy_to_buffer(const char *Ptr, size_t Size) { |
| assert(Size <= size_t(OutBufEnd - OutBufCur) && "Buffer overrun!"); |
| |
| // Handle short strings specially, memcpy isn't very good at very short |
| // strings. |
| switch (Size) { |
| case 4: OutBufCur[3] = Ptr[3]; LLVM_FALLTHROUGH; |
| case 3: OutBufCur[2] = Ptr[2]; LLVM_FALLTHROUGH; |
| case 2: OutBufCur[1] = Ptr[1]; LLVM_FALLTHROUGH; |
| case 1: OutBufCur[0] = Ptr[0]; LLVM_FALLTHROUGH; |
| case 0: break; |
| default: |
| memcpy(OutBufCur, Ptr, Size); |
| break; |
| } |
| |
| OutBufCur += Size; |
| } |
| |
| void raw_ostream::flush_tied_then_write(const char *Ptr, size_t Size) { |
| if (TiedStream) |
| TiedStream->flush(); |
| write_impl(Ptr, Size); |
| } |
| |
| // Formatted output. |
| raw_ostream &raw_ostream::operator<<(const format_object_base &Fmt) { |
| // If we have more than a few bytes left in our output buffer, try |
| // formatting directly onto its end. |
| size_t NextBufferSize = 127; |
| size_t BufferBytesLeft = OutBufEnd - OutBufCur; |
| if (BufferBytesLeft > 3) { |
| size_t BytesUsed = Fmt.print(OutBufCur, BufferBytesLeft); |
| |
| // Common case is that we have plenty of space. |
| if (BytesUsed <= BufferBytesLeft) { |
| OutBufCur += BytesUsed; |
| return *this; |
| } |
| |
| // Otherwise, we overflowed and the return value tells us the size to try |
| // again with. |
| NextBufferSize = BytesUsed; |
| } |
| |
| // If we got here, we didn't have enough space in the output buffer for the |
| // string. Try printing into a SmallVector that is resized to have enough |
| // space. Iterate until we win. |
| SmallVector<char, 128> V; |
| |
| while (true) { |
| V.resize(NextBufferSize); |
| |
| // Try formatting into the SmallVector. |
| size_t BytesUsed = Fmt.print(V.data(), NextBufferSize); |
| |
| // If BytesUsed fit into the vector, we win. |
| if (BytesUsed <= NextBufferSize) |
| return write(V.data(), BytesUsed); |
| |
| // Otherwise, try again with a new size. |
| assert(BytesUsed > NextBufferSize && "Didn't grow buffer!?"); |
| NextBufferSize = BytesUsed; |
| } |
| } |
| |
| raw_ostream &raw_ostream::operator<<(const formatv_object_base &Obj) { |
| Obj.format(*this); |
| return *this; |
| } |
| |
| raw_ostream &raw_ostream::operator<<(const FormattedString &FS) { |
| unsigned LeftIndent = 0; |
| unsigned RightIndent = 0; |
| const ssize_t Difference = FS.Width - FS.Str.size(); |
| if (Difference > 0) { |
| switch (FS.Justify) { |
| case FormattedString::JustifyNone: |
| break; |
| case FormattedString::JustifyLeft: |
| RightIndent = Difference; |
| break; |
| case FormattedString::JustifyRight: |
| LeftIndent = Difference; |
| break; |
| case FormattedString::JustifyCenter: |
| LeftIndent = Difference / 2; |
| RightIndent = Difference - LeftIndent; |
| break; |
| } |
| } |
| indent(LeftIndent); |
| (*this) << FS.Str; |
| indent(RightIndent); |
| return *this; |
| } |
| |
| raw_ostream &raw_ostream::operator<<(const FormattedNumber &FN) { |
| if (FN.Hex) { |
| HexPrintStyle Style; |
| if (FN.Upper && FN.HexPrefix) |
| Style = HexPrintStyle::PrefixUpper; |
| else if (FN.Upper && !FN.HexPrefix) |
| Style = HexPrintStyle::Upper; |
| else if (!FN.Upper && FN.HexPrefix) |
| Style = HexPrintStyle::PrefixLower; |
| else |
| Style = HexPrintStyle::Lower; |
| llvm::write_hex(*this, FN.HexValue, Style, FN.Width); |
| } else { |
| llvm::SmallString<16> Buffer; |
| llvm::raw_svector_ostream Stream(Buffer); |
| llvm::write_integer(Stream, FN.DecValue, 0, IntegerStyle::Integer); |
| if (Buffer.size() < FN.Width) |
| indent(FN.Width - Buffer.size()); |
| (*this) << Buffer; |
| } |
| return *this; |
| } |
| |
| raw_ostream &raw_ostream::operator<<(const FormattedBytes &FB) { |
| if (FB.Bytes.empty()) |
| return *this; |
| |
| size_t LineIndex = 0; |
| auto Bytes = FB.Bytes; |
| const size_t Size = Bytes.size(); |
| HexPrintStyle HPS = FB.Upper ? HexPrintStyle::Upper : HexPrintStyle::Lower; |
| uint64_t OffsetWidth = 0; |
| if (FB.FirstByteOffset.hasValue()) { |
| // Figure out how many nibbles are needed to print the largest offset |
| // represented by this data set, so that we can align the offset field |
| // to the right width. |
| size_t Lines = Size / FB.NumPerLine; |
| uint64_t MaxOffset = *FB.FirstByteOffset + Lines * FB.NumPerLine; |
| unsigned Power = 0; |
| if (MaxOffset > 0) |
| Power = llvm::Log2_64_Ceil(MaxOffset); |
| OffsetWidth = std::max<uint64_t>(4, llvm::alignTo(Power, 4) / 4); |
| } |
| |
| // The width of a block of data including all spaces for group separators. |
| unsigned NumByteGroups = |
| alignTo(FB.NumPerLine, FB.ByteGroupSize) / FB.ByteGroupSize; |
| unsigned BlockCharWidth = FB.NumPerLine * 2 + NumByteGroups - 1; |
| |
| while (!Bytes.empty()) { |
| indent(FB.IndentLevel); |
| |
| if (FB.FirstByteOffset.hasValue()) { |
| uint64_t Offset = FB.FirstByteOffset.getValue(); |
| llvm::write_hex(*this, Offset + LineIndex, HPS, OffsetWidth); |
| *this << ": "; |
| } |
| |
| auto Line = Bytes.take_front(FB.NumPerLine); |
| |
| size_t CharsPrinted = 0; |
| // Print the hex bytes for this line in groups |
| for (size_t I = 0; I < Line.size(); ++I, CharsPrinted += 2) { |
| if (I && (I % FB.ByteGroupSize) == 0) { |
| ++CharsPrinted; |
| *this << " "; |
| } |
| llvm::write_hex(*this, Line[I], HPS, 2); |
| } |
| |
| if (FB.ASCII) { |
| // Print any spaces needed for any bytes that we didn't print on this |
| // line so that the ASCII bytes are correctly aligned. |
| assert(BlockCharWidth >= CharsPrinted); |
| indent(BlockCharWidth - CharsPrinted + 2); |
| *this << "|"; |
| |
| // Print the ASCII char values for each byte on this line |
| for (uint8_t Byte : Line) { |
| if (isPrint(Byte)) |
| *this << static_cast<char>(Byte); |
| else |
| *this << '.'; |
| } |
| *this << '|'; |
| } |
| |
| Bytes = Bytes.drop_front(Line.size()); |
| LineIndex += Line.size(); |
| if (LineIndex < Size) |
| *this << '\n'; |
| } |
| return *this; |
| } |
| |
| template <char C> |
| static raw_ostream &write_padding(raw_ostream &OS, unsigned NumChars) { |
| static const char Chars[] = {C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, |
| C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, |
| C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, |
| C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, |
| C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C}; |
| |
| // Usually the indentation is small, handle it with a fastpath. |
| if (NumChars < array_lengthof(Chars)) |
| return OS.write(Chars, NumChars); |
| |
| while (NumChars) { |
| unsigned NumToWrite = std::min(NumChars, |
| (unsigned)array_lengthof(Chars)-1); |
| OS.write(Chars, NumToWrite); |
| NumChars -= NumToWrite; |
| } |
| return OS; |
| } |
| |
| /// indent - Insert 'NumSpaces' spaces. |
| raw_ostream &raw_ostream::indent(unsigned NumSpaces) { |
| return write_padding<' '>(*this, NumSpaces); |
| } |
| |
| /// write_zeros - Insert 'NumZeros' nulls. |
| raw_ostream &raw_ostream::write_zeros(unsigned NumZeros) { |
| return write_padding<'\0'>(*this, NumZeros); |
| } |
| |
| bool raw_ostream::prepare_colors() { |
| // Colors were explicitly disabled. |
| if (!ColorEnabled) |
| return false; |
| |
| // Colors require changing the terminal but this stream is not going to a |
| // terminal. |
| if (sys::Process::ColorNeedsFlush() && !is_displayed()) |
| return false; |
| |
| if (sys::Process::ColorNeedsFlush()) |
| flush(); |
| |
| return true; |
| } |
| |
| raw_ostream &raw_ostream::changeColor(enum Colors colors, bool bold, bool bg) { |
| if (!prepare_colors()) |
| return *this; |
| |
| const char *colorcode = |
| (colors == SAVEDCOLOR) |
| ? sys::Process::OutputBold(bg) |
| : sys::Process::OutputColor(static_cast<char>(colors), bold, bg); |
| if (colorcode) |
| write(colorcode, strlen(colorcode)); |
| return *this; |
| } |
| |
| raw_ostream &raw_ostream::resetColor() { |
| if (!prepare_colors()) |
| return *this; |
| |
| if (const char *colorcode = sys::Process::ResetColor()) |
| write(colorcode, strlen(colorcode)); |
| return *this; |
| } |
| |
| raw_ostream &raw_ostream::reverseColor() { |
| if (!prepare_colors()) |
| return *this; |
| |
| if (const char *colorcode = sys::Process::OutputReverse()) |
| write(colorcode, strlen(colorcode)); |
| return *this; |
| } |
| |
| void raw_ostream::anchor() {} |
| |
| //===----------------------------------------------------------------------===// |
| // Formatted Output |
| //===----------------------------------------------------------------------===// |
| |
| // Out of line virtual method. |
| void format_object_base::home() { |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // raw_fd_ostream |
| //===----------------------------------------------------------------------===// |
| |
| static int getFD(StringRef Filename, std::error_code &EC, |
| sys::fs::CreationDisposition Disp, sys::fs::FileAccess Access, |
| sys::fs::OpenFlags Flags) { |
| assert((Access & sys::fs::FA_Write) && |
| "Cannot make a raw_ostream from a read-only descriptor!"); |
| |
| // Handle "-" as stdout. Note that when we do this, we consider ourself |
| // the owner of stdout and may set the "binary" flag globally based on Flags. |
| if (Filename == "-") { |
| EC = std::error_code(); |
| // Change stdout's text/binary mode based on the Flags. |
| sys::ChangeStdoutMode(Flags); |
| return STDOUT_FILENO; |
| } |
| |
| int FD; |
| if (Access & sys::fs::FA_Read) |
| EC = sys::fs::openFileForReadWrite(Filename, FD, Disp, Flags); |
| else |
| EC = sys::fs::openFileForWrite(Filename, FD, Disp, Flags); |
| if (EC) |
| return -1; |
| |
| return FD; |
| } |
| |
| raw_fd_ostream::raw_fd_ostream(StringRef Filename, std::error_code &EC) |
| : raw_fd_ostream(Filename, EC, sys::fs::CD_CreateAlways, sys::fs::FA_Write, |
| sys::fs::OF_None) {} |
| |
| raw_fd_ostream::raw_fd_ostream(StringRef Filename, std::error_code &EC, |
| sys::fs::CreationDisposition Disp) |
| : raw_fd_ostream(Filename, EC, Disp, sys::fs::FA_Write, sys::fs::OF_None) {} |
| |
| raw_fd_ostream::raw_fd_ostream(StringRef Filename, std::error_code &EC, |
| sys::fs::FileAccess Access) |
| : raw_fd_ostream(Filename, EC, sys::fs::CD_CreateAlways, Access, |
| sys::fs::OF_None) {} |
| |
| raw_fd_ostream::raw_fd_ostream(StringRef Filename, std::error_code &EC, |
| sys::fs::OpenFlags Flags) |
| : raw_fd_ostream(Filename, EC, sys::fs::CD_CreateAlways, sys::fs::FA_Write, |
| Flags) {} |
| |
| raw_fd_ostream::raw_fd_ostream(StringRef Filename, std::error_code &EC, |
| sys::fs::CreationDisposition Disp, |
| sys::fs::FileAccess Access, |
| sys::fs::OpenFlags Flags) |
| : raw_fd_ostream(getFD(Filename, EC, Disp, Access, Flags), true) {} |
| |
| /// 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::raw_fd_ostream(int fd, bool shouldClose, bool unbuffered, |
| OStreamKind K) |
| : raw_pwrite_stream(unbuffered, K), FD(fd), ShouldClose(shouldClose) { |
| if (FD < 0 ) { |
| ShouldClose = false; |
| return; |
| } |
| |
| enable_colors(true); |
| |
| // Do not attempt to close stdout or stderr. We used to try to maintain the |
| // property that tools that support writing file to stdout should not also |
| // write informational output to stdout, but in practice we were never able to |
| // maintain this invariant. Many features have been added to LLVM and clang |
| // (-fdump-record-layouts, optimization remarks, etc) that print to stdout, so |
| // users must simply be aware that mixed output and remarks is a possibility. |
| if (FD <= STDERR_FILENO) |
| ShouldClose = false; |
| |
| #ifdef _WIN32 |
| // Check if this is a console device. This is not equivalent to isatty. |
| IsWindowsConsole = |
| ::GetFileType((HANDLE)::_get_osfhandle(fd)) == FILE_TYPE_CHAR; |
| #endif |
| |
| // Get the starting position. |
| off_t loc = ::lseek(FD, 0, SEEK_CUR); |
| #ifdef _WIN32 |
| // MSVCRT's _lseek(SEEK_CUR) doesn't return -1 for pipes. |
| sys::fs::file_status Status; |
| std::error_code EC = status(FD, Status); |
| SupportsSeeking = !EC && Status.type() == sys::fs::file_type::regular_file; |
| #else |
| SupportsSeeking = loc != (off_t)-1; |
| #endif |
| if (!SupportsSeeking) |
| pos = 0; |
| else |
| pos = static_cast<uint64_t>(loc); |
| } |
| |
| raw_fd_ostream::~raw_fd_ostream() { |
| if (FD >= 0) { |
| flush(); |
| if (ShouldClose) { |
| if (auto EC = sys::Process::SafelyCloseFileDescriptor(FD)) |
| error_detected(EC); |
| } |
| } |
| |
| #ifdef __MINGW32__ |
| // On mingw, global dtors should not call exit(). |
| // report_fatal_error() invokes exit(). We know report_fatal_error() |
| // might not write messages to stderr when any errors were detected |
| // on FD == 2. |
| if (FD == 2) return; |
| #endif |
| |
| // If there are any pending errors, report them now. Clients wishing |
| // to avoid report_fatal_error calls should check for errors with |
| // has_error() and clear the error flag with clear_error() before |
| // destructing raw_ostream objects which may have errors. |
| if (has_error()) |
| report_fatal_error(Twine("IO failure on output stream: ") + |
| error().message(), |
| /*gen_crash_diag=*/false); |
| } |
| |
| #if defined(_WIN32) |
| // The most reliable way to print unicode in a Windows console is with |
| // WriteConsoleW. To use that, first transcode from UTF-8 to UTF-16. This |
| // assumes that LLVM programs always print valid UTF-8 to the console. The data |
| // might not be UTF-8 for two major reasons: |
| // 1. The program is printing binary (-filetype=obj -o -), in which case it |
| // would have been gibberish anyway. |
| // 2. The program is printing text in a semi-ascii compatible codepage like |
| // shift-jis or cp1252. |
| // |
| // Most LLVM programs don't produce non-ascii text unless they are quoting |
| // user source input. A well-behaved LLVM program should either validate that |
| // the input is UTF-8 or transcode from the local codepage to UTF-8 before |
| // quoting it. If they don't, this may mess up the encoding, but this is still |
| // probably the best compromise we can make. |
| static bool write_console_impl(int FD, StringRef Data) { |
| SmallVector<wchar_t, 256> WideText; |
| |
| // Fall back to ::write if it wasn't valid UTF-8. |
| if (auto EC = sys::windows::UTF8ToUTF16(Data, WideText)) |
| return false; |
| |
| // On Windows 7 and earlier, WriteConsoleW has a low maximum amount of data |
| // that can be written to the console at a time. |
| size_t MaxWriteSize = WideText.size(); |
| if (!RunningWindows8OrGreater()) |
| MaxWriteSize = 32767; |
| |
| size_t WCharsWritten = 0; |
| do { |
| size_t WCharsToWrite = |
| std::min(MaxWriteSize, WideText.size() - WCharsWritten); |
| DWORD ActuallyWritten; |
| bool Success = |
| ::WriteConsoleW((HANDLE)::_get_osfhandle(FD), &WideText[WCharsWritten], |
| WCharsToWrite, &ActuallyWritten, |
| /*Reserved=*/nullptr); |
| |
| // The most likely reason for WriteConsoleW to fail is that FD no longer |
| // points to a console. Fall back to ::write. If this isn't the first loop |
| // iteration, something is truly wrong. |
| if (!Success) |
| return false; |
| |
| WCharsWritten += ActuallyWritten; |
| } while (WCharsWritten != WideText.size()); |
| return true; |
| } |
| #endif |
| |
| void raw_fd_ostream::write_impl(const char *Ptr, size_t Size) { |
| assert(FD >= 0 && "File already closed."); |
| pos += Size; |
| |
| #if defined(_WIN32) |
| // If this is a Windows console device, try re-encoding from UTF-8 to UTF-16 |
| // and using WriteConsoleW. If that fails, fall back to plain write(). |
| if (IsWindowsConsole) |
| if (write_console_impl(FD, StringRef(Ptr, Size))) |
| return; |
| #endif |
| |
| // The maximum write size is limited to INT32_MAX. A write |
| // greater than SSIZE_MAX is implementation-defined in POSIX, |
| // and Windows _write requires 32 bit input. |
| size_t MaxWriteSize = INT32_MAX; |
| |
| #if defined(__linux__) |
| // It is observed that Linux returns EINVAL for a very large write (>2G). |
| // Make it a reasonably small value. |
| MaxWriteSize = 1024 * 1024 * 1024; |
| #endif |
| |
| do { |
| size_t ChunkSize = std::min(Size, MaxWriteSize); |
| ssize_t ret = ::write(FD, Ptr, ChunkSize); |
| |
| if (ret < 0) { |
| // If it's a recoverable error, swallow it and retry the write. |
| // |
| // Ideally we wouldn't ever see EAGAIN or EWOULDBLOCK here, since |
| // raw_ostream isn't designed to do non-blocking I/O. However, some |
| // programs, such as old versions of bjam, have mistakenly used |
| // O_NONBLOCK. For compatibility, emulate blocking semantics by |
| // spinning until the write succeeds. If you don't want spinning, |
| // don't use O_NONBLOCK file descriptors with raw_ostream. |
| if (errno == EINTR || errno == EAGAIN |
| #ifdef EWOULDBLOCK |
| || errno == EWOULDBLOCK |
| #endif |
| ) |
| continue; |
| |
| // Otherwise it's a non-recoverable error. Note it and quit. |
| error_detected(std::error_code(errno, std::generic_category())); |
| break; |
| } |
| |
| // The write may have written some or all of the data. Update the |
| // size and buffer pointer to reflect the remainder that needs |
| // to be written. If there are no bytes left, we're done. |
| Ptr += ret; |
| Size -= ret; |
| } while (Size > 0); |
| } |
| |
| void raw_fd_ostream::close() { |
| assert(ShouldClose); |
| ShouldClose = false; |
| flush(); |
| if (auto EC = sys::Process::SafelyCloseFileDescriptor(FD)) |
| error_detected(EC); |
| FD = -1; |
| } |
| |
| uint64_t raw_fd_ostream::seek(uint64_t off) { |
| assert(SupportsSeeking && "Stream does not support seeking!"); |
| flush(); |
| #ifdef _WIN32 |
| pos = ::_lseeki64(FD, off, SEEK_SET); |
| #elif defined(HAVE_LSEEK64) |
| pos = ::lseek64(FD, off, SEEK_SET); |
| #else |
| pos = ::lseek(FD, off, SEEK_SET); |
| #endif |
| if (pos == (uint64_t)-1) |
| error_detected(std::error_code(errno, std::generic_category())); |
| return pos; |
| } |
| |
| void raw_fd_ostream::pwrite_impl(const char *Ptr, size_t Size, |
| uint64_t Offset) { |
| uint64_t Pos = tell(); |
| seek(Offset); |
| write(Ptr, Size); |
| seek(Pos); |
| } |
| |
| size_t raw_fd_ostream::preferred_buffer_size() const { |
| #if defined(_WIN32) |
| // Disable buffering for console devices. Console output is re-encoded from |
| // UTF-8 to UTF-16 on Windows, and buffering it would require us to split the |
| // buffer on a valid UTF-8 codepoint boundary. Terminal buffering is disabled |
| // below on most other OSs, so do the same thing on Windows and avoid that |
| // complexity. |
| if (IsWindowsConsole) |
| return 0; |
| return raw_ostream::preferred_buffer_size(); |
| #elif !defined(__minix) |
| // Minix has no st_blksize. |
| assert(FD >= 0 && "File not yet open!"); |
| struct stat statbuf; |
| if (fstat(FD, &statbuf) != 0) |
| return 0; |
| |
| // If this is a terminal, don't use buffering. Line buffering |
| // would be a more traditional thing to do, but it's not worth |
| // the complexity. |
| if (S_ISCHR(statbuf.st_mode) && is_displayed()) |
| return 0; |
| // Return the preferred block size. |
| return statbuf.st_blksize; |
| #else |
| return raw_ostream::preferred_buffer_size(); |
| #endif |
| } |
| |
| bool raw_fd_ostream::is_displayed() const { |
| return sys::Process::FileDescriptorIsDisplayed(FD); |
| } |
| |
| bool raw_fd_ostream::has_colors() const { |
| if (!HasColors) |
| HasColors = sys::Process::FileDescriptorHasColors(FD); |
| return *HasColors; |
| } |
| |
| Expected<sys::fs::FileLocker> raw_fd_ostream::lock() { |
| std::error_code EC = sys::fs::lockFile(FD); |
| if (!EC) |
| return sys::fs::FileLocker(FD); |
| return errorCodeToError(EC); |
| } |
| |
| Expected<sys::fs::FileLocker> |
| raw_fd_ostream::tryLockFor(std::chrono::milliseconds Timeout) { |
| std::error_code EC = sys::fs::tryLockFile(FD, Timeout); |
| if (!EC) |
| return sys::fs::FileLocker(FD); |
| return errorCodeToError(EC); |
| } |
| |
| void raw_fd_ostream::anchor() {} |
| |
| //===----------------------------------------------------------------------===// |
| // outs(), errs(), nulls() |
| //===----------------------------------------------------------------------===// |
| |
| raw_fd_ostream &llvm::outs() { |
| // Set buffer settings to model stdout behavior. |
| std::error_code EC; |
| static raw_fd_ostream S("-", EC, sys::fs::OF_None); |
| assert(!EC); |
| return S; |
| } |
| |
| raw_fd_ostream &llvm::errs() { |
| // Set standard error to be unbuffered and tied to outs() by default. |
| static raw_fd_ostream S(STDERR_FILENO, false, true); |
| return S; |
| } |
| |
| /// nulls() - This returns a reference to a raw_ostream which discards output. |
| raw_ostream &llvm::nulls() { |
| static raw_null_ostream S; |
| return S; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // File Streams |
| //===----------------------------------------------------------------------===// |
| |
| raw_fd_stream::raw_fd_stream(StringRef Filename, std::error_code &EC) |
| : raw_fd_ostream(getFD(Filename, EC, sys::fs::CD_CreateAlways, |
| sys::fs::FA_Write | sys::fs::FA_Read, |
| sys::fs::OF_None), |
| true, false, OStreamKind::OK_FDStream) { |
| if (EC) |
| return; |
| |
| // Do not support non-seekable files. |
| if (!supportsSeeking()) |
| EC = std::make_error_code(std::errc::invalid_argument); |
| } |
| |
| ssize_t raw_fd_stream::read(char *Ptr, size_t Size) { |
| assert(get_fd() >= 0 && "File already closed."); |
| ssize_t Ret = ::read(get_fd(), (void *)Ptr, Size); |
| if (Ret >= 0) |
| inc_pos(Ret); |
| else |
| error_detected(std::error_code(errno, std::generic_category())); |
| return Ret; |
| } |
| |
| bool raw_fd_stream::classof(const raw_ostream *OS) { |
| return OS->get_kind() == OStreamKind::OK_FDStream; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // raw_string_ostream |
| //===----------------------------------------------------------------------===// |
| |
| raw_string_ostream::~raw_string_ostream() { |
| flush(); |
| } |
| |
| void raw_string_ostream::write_impl(const char *Ptr, size_t Size) { |
| OS.append(Ptr, Size); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // raw_svector_ostream |
| //===----------------------------------------------------------------------===// |
| |
| uint64_t raw_svector_ostream::current_pos() const { return OS.size(); } |
| |
| void raw_svector_ostream::write_impl(const char *Ptr, size_t Size) { |
| OS.append(Ptr, Ptr + Size); |
| } |
| |
| void raw_svector_ostream::pwrite_impl(const char *Ptr, size_t Size, |
| uint64_t Offset) { |
| memcpy(OS.data() + Offset, Ptr, Size); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // raw_null_ostream |
| //===----------------------------------------------------------------------===// |
| |
| raw_null_ostream::~raw_null_ostream() { |
| #ifndef NDEBUG |
| // ~raw_ostream asserts that the buffer is empty. This isn't necessary |
| // with raw_null_ostream, but it's better to have raw_null_ostream follow |
| // the rules than to change the rules just for raw_null_ostream. |
| flush(); |
| #endif |
| } |
| |
| void raw_null_ostream::write_impl(const char *Ptr, size_t Size) { |
| } |
| |
| uint64_t raw_null_ostream::current_pos() const { |
| return 0; |
| } |
| |
| void raw_null_ostream::pwrite_impl(const char *Ptr, size_t Size, |
| uint64_t Offset) {} |
| |
| void raw_pwrite_stream::anchor() {} |
| |
| void buffer_ostream::anchor() {} |
| |
| void buffer_unique_ostream::anchor() {} |
| |
| Error llvm::writeToOutput(StringRef OutputFileName, |
| std::function<Error(raw_ostream &)> Write) { |
| if (OutputFileName == "-") |
| return Write(outs()); |
| |
| if (OutputFileName == "/dev/null") { |
| raw_null_ostream Out; |
| return Write(Out); |
| } |
| |
| unsigned Mode = sys::fs::all_read | sys::fs::all_write | sys::fs::all_exe; |
| Expected<sys::fs::TempFile> Temp = |
| sys::fs::TempFile::create(OutputFileName + ".temp-stream-%%%%%%", Mode); |
| if (!Temp) |
| return createFileError(OutputFileName, Temp.takeError()); |
| |
| raw_fd_ostream Out(Temp->FD, false); |
| |
| if (Error E = Write(Out)) { |
| if (Error DiscardError = Temp->discard()) |
| return joinErrors(std::move(E), std::move(DiscardError)); |
| return E; |
| } |
| Out.flush(); |
| |
| return Temp->keep(OutputFileName); |
| } |