X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FSupport%2Fraw_ostream.cpp;h=c9cf249500d62064ca816bac2467205f0a93928e;hb=317eaf19937813d630166bfec7b933a98ea89aa5;hp=5a99a0cf4032bd610dc7150163afae3a55749f63;hpb=e77e434bc96f2935dcf337909c4009324fe24eaf;p=oota-llvm.git diff --git a/lib/Support/raw_ostream.cpp b/lib/Support/raw_ostream.cpp index 5a99a0cf403..c9cf249500d 100644 --- a/lib/Support/raw_ostream.cpp +++ b/lib/Support/raw_ostream.cpp @@ -13,10 +13,18 @@ #include "llvm/Support/raw_ostream.h" #include "llvm/Support/Format.h" -#include "llvm/System/Program.h" +#include "llvm/Support/Program.h" +#include "llvm/Support/Process.h" +#include "llvm/ADT/StringExtras.h" #include "llvm/ADT/SmallVector.h" #include "llvm/Config/config.h" -#include +#include "llvm/Support/Compiler.h" +#include "llvm/Support/ErrorHandling.h" +#include "llvm/ADT/STLExtras.h" +#include +#include +#include +#include #if defined(HAVE_UNISTD_H) # include @@ -24,6 +32,13 @@ #if defined(HAVE_FCNTL_H) # include #endif +#if defined(HAVE_SYS_UIO_H) && defined(HAVE_WRITEV) +# include +#endif + +#if defined(__CYGWIN__) +#include +#endif #if defined(_MSC_VER) #include @@ -41,19 +56,61 @@ using namespace llvm; +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 == InternalBuffer) + delete [] OutBufStart; +} // An out of line virtual method to provide a home for the class vtable. void raw_ostream::handle() {} +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 == Unbuffered && BufferStart == 0 && Size == 0) || + (Mode != Unbuffered && BufferStart && Size)) && + "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 == 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) { // Zero is a special case. if (N == 0) return *this << '0'; - + char NumberBuffer[20]; char *EndPtr = NumberBuffer+sizeof(NumberBuffer); char *CurPtr = EndPtr; - + while (N) { *--CurPtr = '0' + char(N % 10); N /= 10; @@ -63,25 +120,22 @@ raw_ostream &raw_ostream::operator<<(unsigned long N) { raw_ostream &raw_ostream::operator<<(long N) { if (N < 0) { - if (OutBufCur >= OutBufEnd) - flush_impl(); - *OutBufCur++ = '-'; - + *this << '-'; N = -N; } - + return this->operator<<(static_cast(N)); } raw_ostream &raw_ostream::operator<<(unsigned long long N) { - // Zero is a special case. - if (N == 0) - return *this << '0'; - + // Output using 32-bit div/mod when possible. + if (N == static_cast(N)) + return this->operator<<(static_cast(N)); + char NumberBuffer[20]; char *EndPtr = NumberBuffer+sizeof(NumberBuffer); char *CurPtr = EndPtr; - + while (N) { *--CurPtr = '0' + char(N % 10); N /= 10; @@ -90,27 +144,184 @@ raw_ostream &raw_ostream::operator<<(unsigned long long N) { } raw_ostream &raw_ostream::operator<<(long long N) { - if (N < 0) { - if (OutBufCur >= OutBufEnd) - flush_impl(); - *OutBufCur++ = '-'; - - N = -N; + if (N < 0) { + *this << '-'; + // Avoid undefined behavior on INT64_MIN with a cast. + N = -(unsigned long long)N; } - + return this->operator<<(static_cast(N)); } +raw_ostream &raw_ostream::write_hex(unsigned long long N) { + // Zero is a special case. + if (N == 0) + return *this << '0'; + + char NumberBuffer[20]; + char *EndPtr = NumberBuffer+sizeof(NumberBuffer); + char *CurPtr = EndPtr; + + while (N) { + uintptr_t x = N % 16; + *--CurPtr = (x < 10 ? '0' + x : 'a' + x - 10); + N /= 16; + } + + return write(CurPtr, EndPtr-CurPtr); +} + +raw_ostream &raw_ostream::write_escaped(StringRef Str, + bool UseHexEscapes) { + for (unsigned i = 0, e = Str.size(); i != e; ++i) { + unsigned char c = Str[i]; + + switch (c) { + case '\\': + *this << '\\' << '\\'; + break; + case '\t': + *this << '\\' << 't'; + break; + case '\n': + *this << '\\' << 'n'; + break; + case '"': + *this << '\\' << '"'; + break; + default: + if (std::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) { - // FIXME: This could be much faster if it matters. - return *this << format("%p", P); + *this << '0' << 'x'; + + return write_hex((uintptr_t) P); +} + +raw_ostream &raw_ostream::operator<<(double N) { +#ifdef _WIN32 + // On MSVCRT and compatible, output of %e is incompatible to Posix + // by default. Number of exponent digits should be at least 2. "%+03d" + // FIXME: Implement our formatter to here or Support/Format.h! + int fpcl = _fpclass(N); + + // negative zero + if (fpcl == _FPCLASS_NZ) + return *this << "-0.000000e+00"; + + char buf[16]; + unsigned len; + len = snprintf(buf, sizeof(buf), "%e", N); + if (len <= sizeof(buf) - 2) { + if (len >= 5 && buf[len - 5] == 'e' && buf[len - 3] == '0') { + int cs = buf[len - 4]; + if (cs == '+' || cs == '-') { + int c1 = buf[len - 2]; + int c0 = buf[len - 1]; + if (isdigit(c1) && isdigit(c0)) { + // Trim leading '0': "...e+012" -> "...e+12\0" + buf[len - 3] = c1; + buf[len - 2] = c0; + buf[--len] = 0; + } + } + } + return this->operator<<(buf); + } +#endif + return this->operator<<(format("%e", N)); } -raw_ostream &raw_ostream::write(const char *Ptr, unsigned Size) { - if (OutBufCur+Size > OutBufEnd) - flush_impl(); - + +void raw_ostream::flush_nonempty() { + assert(OutBufCur > OutBufStart && "Invalid call to flush_nonempty."); + size_t Length = OutBufCur - OutBufStart; + OutBufCur = OutBufStart; + write_impl(OutBufStart, Length); +} + +raw_ostream &raw_ostream::write(unsigned char C) { + // Group exceptional cases into a single branch. + if (BUILTIN_EXPECT(OutBufCur >= OutBufEnd, false)) { + if (BUILTIN_EXPECT(!OutBufStart, false)) { + if (BufferMode == Unbuffered) { + write_impl(reinterpret_cast(&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 (BUILTIN_EXPECT(size_t(OutBufEnd - OutBufCur) < Size, false)) { + if (BUILTIN_EXPECT(!OutBufStart, false)) { + if (BufferMode == Unbuffered) { + write_impl(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 (BUILTIN_EXPECT(OutBufCur == OutBufStart, false)) { + size_t BytesToWrite = Size - (Size % NumBytes); + write_impl(Ptr, BytesToWrite); + copy_to_buffer(Ptr + BytesToWrite, Size - BytesToWrite); + 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) { @@ -120,74 +331,74 @@ raw_ostream &raw_ostream::write(const char *Ptr, unsigned Size) { case 1: OutBufCur[0] = Ptr[0]; // FALL THROUGH case 0: break; default: - // Normally the string to emit is shorter than the buffer. - if (Size <= unsigned(OutBufEnd-OutBufStart)) { - memcpy(OutBufCur, Ptr, Size); - break; - } - - // If emitting a string larger than our buffer, emit in chunks. In this - // case we know that we just flushed the buffer. - while (Size) { - unsigned NumToEmit = OutBufEnd-OutBufStart; - if (Size < NumToEmit) NumToEmit = Size; - assert(OutBufCur == OutBufStart); - memcpy(OutBufStart, Ptr, NumToEmit); - Ptr += NumToEmit; - Size -= NumToEmit; - OutBufCur = OutBufStart + NumToEmit; - flush_impl(); - } + memcpy(OutBufCur, Ptr, Size); break; } - OutBufCur += Size; - if (Unbuffered) - flush_impl(); - return *this; + OutBufCur += 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. - unsigned NextBufferSize = 127; - if (OutBufEnd-OutBufCur > 3) { - unsigned BufferBytesLeft = OutBufEnd-OutBufCur; - unsigned BytesUsed = Fmt.print(OutBufCur, BufferBytesLeft); - + // 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) { + 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 V; - + while (1) { V.resize(NextBufferSize); - + // Try formatting into the SmallVector. - unsigned BytesUsed = Fmt.print(&V[0], NextBufferSize); - + size_t BytesUsed = Fmt.print(V.data(), NextBufferSize); + // If BytesUsed fit into the vector, we win. if (BytesUsed <= NextBufferSize) - return write(&V[0], BytesUsed); - + return write(V.data(), BytesUsed); + // Otherwise, try again with a new size. assert(BytesUsed > NextBufferSize && "Didn't grow buffer!?"); NextBufferSize = BytesUsed; } } +/// indent - Insert 'NumSpaces' spaces. +raw_ostream &raw_ostream::indent(unsigned NumSpaces) { + static const char Spaces[] = " " + " " + " "; + + // Usually the indentation is small, handle it with a fastpath. + if (NumSpaces < array_lengthof(Spaces)) + return write(Spaces, NumSpaces); + + while (NumSpaces) { + unsigned NumToWrite = std::min(NumSpaces, + (unsigned)array_lengthof(Spaces)-1); + write(Spaces, NumToWrite); + NumSpaces -= NumToWrite; + } + return *this; +} + + //===----------------------------------------------------------------------===// // Formatted Output //===----------------------------------------------------------------------===// @@ -204,140 +415,349 @@ void format_object_base::home() { /// 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. -raw_fd_ostream::raw_fd_ostream(const char *Filename, bool Binary, - std::string &ErrorInfo) : pos(0) { +raw_fd_ostream::raw_fd_ostream(const char *Filename, std::string &ErrorInfo, + unsigned Flags) + : Error(false), UseAtomicWrites(false), pos(0) +{ + assert(Filename != 0 && "Filename is null"); + // Verify that we don't have both "append" and "excl". + assert((!(Flags & F_Excl) || !(Flags & F_Append)) && + "Cannot specify both 'excl' and 'append' file creation flags!"); + ErrorInfo.clear(); - // Handle "-" as stdout. + // Handle "-" as stdout. Note that when we do this, we consider ourself + // the owner of stdout. This means that we can do things like close the + // file descriptor when we're done and set the "binary" flag globally. if (Filename[0] == '-' && Filename[1] == 0) { FD = STDOUT_FILENO; // If user requested binary then put stdout into binary mode if // possible. - if (Binary) + if (Flags & F_Binary) sys::Program::ChangeStdoutToBinary(); - ShouldClose = false; + // Close stdout when we're done, to detect any output errors. + ShouldClose = true; return; } - - int Flags = O_WRONLY|O_CREAT|O_TRUNC; + + int OpenFlags = O_WRONLY|O_CREAT; #ifdef O_BINARY - if (Binary) - Flags |= O_BINARY; + if (Flags & F_Binary) + OpenFlags |= O_BINARY; #endif - FD = open(Filename, Flags, 0644); - if (FD < 0) { - ErrorInfo = "Error opening output file '" + std::string(Filename) + "'"; - ShouldClose = false; - } else { - ShouldClose = true; + + if (Flags & F_Append) + OpenFlags |= O_APPEND; + else + OpenFlags |= O_TRUNC; + if (Flags & F_Excl) + OpenFlags |= O_EXCL; + + while ((FD = open(Filename, OpenFlags, 0664)) < 0) { + if (errno != EINTR) { + ErrorInfo = "Error opening output file '" + std::string(Filename) + "'"; + ShouldClose = false; + return; + } } + + // Ok, we successfully opened the file, so it'll need to be closed. + ShouldClose = true; +} + +/// 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::raw_fd_ostream(int fd, bool shouldClose, bool unbuffered) + : raw_ostream(unbuffered), FD(fd), + ShouldClose(shouldClose), Error(false), UseAtomicWrites(false) { +#ifdef O_BINARY + // Setting STDOUT and STDERR to binary mode is necessary in Win32 + // to avoid undesirable linefeed conversion. + if (fd == STDOUT_FILENO || fd == STDERR_FILENO) + setmode(fd, O_BINARY); +#endif + + // Get the starting position. + off_t loc = ::lseek(FD, 0, SEEK_CUR); + if (loc == (off_t)-1) + pos = 0; + else + pos = static_cast(loc); } raw_fd_ostream::~raw_fd_ostream() { if (FD >= 0) { flush(); if (ShouldClose) - ::close(FD); + while (::close(FD) != 0) + if (errno != EINTR) { + error_detected(); + break; + } } + +#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("IO failure on output stream."); } -void raw_fd_ostream::flush_impl() { - assert (FD >= 0 && "File already closed."); - if (OutBufCur-OutBufStart) { - pos += (OutBufCur - OutBufStart); - ::write(FD, OutBufStart, OutBufCur-OutBufStart); - } - HandleFlush(); + +void raw_fd_ostream::write_impl(const char *Ptr, size_t Size) { + assert(FD >= 0 && "File already closed."); + pos += Size; + + do { + ssize_t ret; + + // Check whether we should attempt to use atomic writes. + if (BUILTIN_EXPECT(!UseAtomicWrites, true)) { + ret = ::write(FD, Ptr, Size); + } else { + // Use ::writev() where available. +#if defined(HAVE_WRITEV) + struct iovec IOV = { (void*) Ptr, Size }; + ret = ::writev(FD, &IOV, 1); +#else + ret = ::write(FD, Ptr, Size); +#endif + } + + 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(); + 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); + assert(ShouldClose); ShouldClose = false; flush(); - ::close(FD); + while (::close(FD) != 0) + if (errno != EINTR) { + error_detected(); + break; + } FD = -1; } uint64_t raw_fd_ostream::seek(uint64_t off) { flush(); - pos = lseek(FD, off, SEEK_SET); - return pos; + pos = ::lseek(FD, off, SEEK_SET); + if (pos != off) + error_detected(); + return pos; } -//===----------------------------------------------------------------------===// -// raw_stdout/err_ostream -//===----------------------------------------------------------------------===// +size_t raw_fd_ostream::preferred_buffer_size() const { +#if !defined(_MSC_VER) && !defined(__MINGW32__) && !defined(__minix) + // Windows and Minix have 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) && isatty(FD)) + return 0; + // Return the preferred block size. + return statbuf.st_blksize; +#else + return raw_ostream::preferred_buffer_size(); +#endif +} -raw_stdout_ostream::raw_stdout_ostream():raw_fd_ostream(STDOUT_FILENO, false) {} -raw_stderr_ostream::raw_stderr_ostream():raw_fd_ostream(STDERR_FILENO, false, - true) {} +raw_ostream &raw_fd_ostream::changeColor(enum Colors colors, bool bold, + bool bg) { + if (sys::Process::ColorNeedsFlush()) + flush(); + const char *colorcode = + (colors == SAVEDCOLOR) ? sys::Process::OutputBold(bg) + : sys::Process::OutputColor(colors, bold, bg); + if (colorcode) { + size_t len = strlen(colorcode); + write(colorcode, len); + // don't account colors towards output characters + pos -= len; + } + return *this; +} -// An out of line virtual method to provide a home for the class vtable. -void raw_stdout_ostream::handle() {} -void raw_stderr_ostream::handle() {} +raw_ostream &raw_fd_ostream::resetColor() { + if (sys::Process::ColorNeedsFlush()) + flush(); + const char *colorcode = sys::Process::ResetColor(); + if (colorcode) { + size_t len = strlen(colorcode); + write(colorcode, len); + // don't account colors towards output characters + pos -= len; + } + return *this; +} + +bool raw_fd_ostream::is_displayed() const { + return sys::Process::FileDescriptorIsDisplayed(FD); +} + +//===----------------------------------------------------------------------===// +// outs(), errs(), nulls() +//===----------------------------------------------------------------------===// /// outs() - This returns a reference to a raw_ostream for standard output. /// Use it like: outs() << "foo" << "bar"; raw_ostream &llvm::outs() { - static raw_stdout_ostream S; + // Set buffer settings to model stdout behavior. + // Delete the file descriptor when the program exists, forcing error + // detection. If you don't want this behavior, don't use outs(). + static raw_fd_ostream S(STDOUT_FILENO, true); return S; } /// errs() - This returns a reference to a raw_ostream for standard error. /// Use it like: errs() << "foo" << "bar"; raw_ostream &llvm::errs() { - static raw_stderr_ostream S; + // Set standard error to be unbuffered 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; +} + + //===----------------------------------------------------------------------===// -// raw_os_ostream +// raw_string_ostream //===----------------------------------------------------------------------===// -raw_os_ostream::~raw_os_ostream() { +raw_string_ostream::~raw_string_ostream() { flush(); } -/// flush_impl - The is the piece of the class that is implemented by -/// subclasses. This outputs the currently buffered data and resets the -/// buffer to empty. -void raw_os_ostream::flush_impl() { - if (OutBufCur-OutBufStart) - OS.write(OutBufStart, OutBufCur-OutBufStart); - HandleFlush(); +void raw_string_ostream::write_impl(const char *Ptr, size_t Size) { + OS.append(Ptr, Size); } //===----------------------------------------------------------------------===// -// raw_string_ostream +// raw_svector_ostream //===----------------------------------------------------------------------===// -raw_string_ostream::~raw_string_ostream() { +// The raw_svector_ostream implementation uses the SmallVector itself as the +// buffer for the raw_ostream. We guarantee that the raw_ostream buffer is +// always pointing past the end of the vector, but within the vector +// capacity. This allows raw_ostream to write directly into the correct place, +// and we only need to set the vector size when the data is flushed. + +raw_svector_ostream::raw_svector_ostream(SmallVectorImpl &O) : OS(O) { + // Set up the initial external buffer. We make sure that the buffer has at + // least 128 bytes free; raw_ostream itself only requires 64, but we want to + // make sure that we don't grow the buffer unnecessarily on destruction (when + // the data is flushed). See the FIXME below. + OS.reserve(OS.size() + 128); + SetBuffer(OS.end(), OS.capacity() - OS.size()); +} + +raw_svector_ostream::~raw_svector_ostream() { + // FIXME: Prevent resizing during this flush(). flush(); } -/// flush_impl - The is the piece of the class that is implemented by -/// subclasses. This outputs the currently buffered data and resets the -/// buffer to empty. -void raw_string_ostream::flush_impl() { - if (OutBufCur-OutBufStart) - OS.append(OutBufStart, OutBufCur-OutBufStart); - HandleFlush(); +/// 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 raw_svector_ostream::resync() { + assert(GetNumBytesInBuffer() == 0 && "Didn't flush before mutating vector"); + + if (OS.capacity() - OS.size() < 64) + OS.reserve(OS.capacity() * 2); + SetBuffer(OS.end(), OS.capacity() - OS.size()); +} + +void raw_svector_ostream::write_impl(const char *Ptr, size_t Size) { + // If we're writing bytes from the end of the buffer into the smallvector, we + // don't need to copy the bytes, just commit the bytes because they are + // already in the right place. + if (Ptr == OS.end()) { + assert(OS.size() + Size <= OS.capacity() && "Invalid write_impl() call!"); + OS.set_size(OS.size() + Size); + } else { + assert(GetNumBytesInBuffer() == 0 && + "Should be writing from buffer if some bytes in it"); + // Otherwise, do copy the bytes. + OS.append(Ptr, Ptr+Size); + } + + // Grow the vector if necessary. + if (OS.capacity() - OS.size() < 64) + OS.reserve(OS.capacity() * 2); + + // Update the buffer position. + SetBuffer(OS.end(), OS.capacity() - OS.size()); +} + +uint64_t raw_svector_ostream::current_pos() const { + return OS.size(); +} + +StringRef raw_svector_ostream::str() { + flush(); + return StringRef(OS.begin(), OS.size()); } //===----------------------------------------------------------------------===// -// raw_svector_ostream +// raw_null_ostream //===----------------------------------------------------------------------===// -raw_svector_ostream::~raw_svector_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 } -/// flush_impl - The is the piece of the class that is implemented by -/// subclasses. This outputs the currently buffered data and resets the -/// buffer to empty. -void raw_svector_ostream::flush_impl() { - if (OutBufCur-OutBufStart) - OS.append(OutBufStart, OutBufCur); - HandleFlush(); +void raw_null_ostream::write_impl(const char *Ptr, size_t Size) { } +uint64_t raw_null_ostream::current_pos() const { + return 0; +}