#include "llvm/Config/config.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/ErrorHandling.h"
-#include <ostream>
+#include "llvm/ADT/STLExtras.h"
+#include <cctype>
+#include <cerrno>
+#include <sys/stat.h>
+#include <sys/types.h>
#if defined(HAVE_UNISTD_H)
# include <unistd.h>
assert(OutBufCur == OutBufStart &&
"raw_ostream destructor called with non-empty buffer!");
- delete [] OutBufStart;
+ if (BufferMode == InternalBuffer)
+ delete [] OutBufStart;
// If there are any pending errors, report them now. Clients wishing
- // to avoid llvm_report_error calls should check for errors with
+ // 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 (Error)
- llvm_report_error("IO failure on output stream.");
+ report_fatal_error("IO failure on output stream.");
}
// An out of line virtual method to provide a home for the class vtable.
void raw_ostream::handle() {}
-void raw_ostream::SetBufferSize(size_t Size) {
- assert(Size >= 64 &&
- "Buffer size must be somewhat large for invariants to hold");
- flush();
+size_t raw_ostream::preferred_buffer_size() const {
+ // BUFSIZ is intended to be a reasonable default.
+ return BUFSIZ;
+}
- delete [] OutBufStart;
- OutBufStart = new char[Size];
- OutBufEnd = OutBufStart+Size;
- OutBufCur = OutBufStart;
- Unbuffered = false;
+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::SetUnbuffered() {
- flush();
+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;
- delete [] OutBufStart;
- OutBufStart = OutBufEnd = OutBufCur = 0;
- Unbuffered = true;
+ 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;
*this << '-';
N = -N;
}
-
+
return this->operator<<(static_cast<unsigned long>(N));
}
char NumberBuffer[20];
char *EndPtr = NumberBuffer+sizeof(NumberBuffer);
char *CurPtr = EndPtr;
-
+
while (N) {
*--CurPtr = '0' + char(N % 10);
N /= 10;
*this << '-';
N = -N;
}
-
+
return this->operator<<(static_cast<unsigned long long>(N));
}
return write(CurPtr, EndPtr-CurPtr);
}
+raw_ostream &raw_ostream::write_escaped(StringRef Str) {
+ 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;
+ }
+
+ // Always expand to a 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) {
*this << '0' << 'x';
return write_hex((uintptr_t) P);
}
+raw_ostream &raw_ostream::operator<<(double N) {
+ return this->operator<<(format("%e", N));
+}
+
+
+
void raw_ostream::flush_nonempty() {
assert(OutBufCur > OutBufStart && "Invalid call to flush_nonempty.");
- write_impl(OutBufStart, OutBufCur - OutBufStart);
- OutBufCur = OutBufStart;
+ 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 (OutBufCur >= OutBufEnd) {
- if (Unbuffered) {
- write_impl(reinterpret_cast<char*>(&C), 1);
- return *this;
+ if (BUILTIN_EXPECT(OutBufCur >= OutBufEnd, false)) {
+ if (BUILTIN_EXPECT(!OutBufStart, false)) {
+ if (BufferMode == Unbuffered) {
+ write_impl(reinterpret_cast<char*>(&C), 1);
+ return *this;
+ }
+ // Set up a buffer and start over.
+ SetBuffered();
+ return write(C);
}
-
- if (!OutBufStart)
- SetBufferSize();
- else
- flush_nonempty();
+
+ flush_nonempty();
}
*OutBufCur++ = C;
// Group exceptional cases into a single branch.
if (BUILTIN_EXPECT(OutBufCur+Size > OutBufEnd, false)) {
if (BUILTIN_EXPECT(!OutBufStart, false)) {
- if (Unbuffered) {
+ if (BufferMode == Unbuffered) {
write_impl(Ptr, Size);
return *this;
}
// Set up a buffer and start over.
- SetBufferSize();
+ SetBuffered();
return write(Ptr, Size);
}
+
// Write out the data in buffer-sized blocks until the remainder
// fits within the buffer.
do {
}
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) {
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.
- //
- // FIXME: This test is a bit silly, since if we don't have enough
- // space in the buffer we will have to flush the formatted output
- // anyway. We should just flush upfront in such cases, and use the
- // whole buffer as our scratch pad. Note, however, that this case is
- // also necessary for correctness on unbuffered streams.
size_t NextBufferSize = 127;
- if (OutBufEnd-OutBufCur > 3) {
- size_t BufferBytesLeft = OutBufEnd-OutBufCur;
+ 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<char, 128> V;
-
+
while (1) {
V.resize(NextBufferSize);
-
+
// Try formatting into the SmallVector.
- size_t 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
//===----------------------------------------------------------------------===//
/// 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, bool Force,
- std::string &ErrorInfo) : pos(0) {
+raw_fd_ostream::raw_fd_ostream(const char *Filename, std::string &ErrorInfo,
+ unsigned Flags) : 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.
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;
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
- if (!Force)
- Flags |= O_EXCL;
- FD = open(Filename, Flags, 0664);
- 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::~raw_fd_ostream() {
- if (FD >= 0) {
- flush();
- if (ShouldClose)
- if (::close(FD) != 0)
+ if (FD < 0) return;
+ flush();
+ if (ShouldClose)
+ while (::close(FD) != 0)
+ if (errno != EINTR) {
error_detected();
- }
+ break;
+ }
}
+
void raw_fd_ostream::write_impl(const char *Ptr, size_t Size) {
- assert (FD >= 0 && "File already closed.");
+ assert(FD >= 0 && "File already closed.");
pos += Size;
- if (::write(FD, Ptr, Size) != (ssize_t) Size)
- error_detected();
+
+ do {
+ ssize_t ret = ::write(FD, Ptr, Size);
+
+ 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();
- if (::close(FD) != 0)
- error_detected();
+ while (::close(FD) != 0)
+ if (errno != EINTR) {
+ error_detected();
+ break;
+ }
FD = -1;
}
pos = ::lseek(FD, off, SEEK_SET);
if (pos != off)
error_detected();
- return pos;
+ return pos;
+}
+
+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_ostream &raw_fd_ostream::changeColor(enum Colors colors, bool bold,
return *this;
}
+bool raw_fd_ostream::is_displayed() const {
+ return sys::Process::FileDescriptorIsDisplayed(FD);
+}
+
//===----------------------------------------------------------------------===//
// raw_stdout/err_ostream
//===----------------------------------------------------------------------===//
+// Set buffer settings to model stdout and stderr behavior.
+// Set standard error to be unbuffered by default.
raw_stdout_ostream::raw_stdout_ostream():raw_fd_ostream(STDOUT_FILENO, false) {}
-raw_stderr_ostream::raw_stderr_ostream():raw_fd_ostream(STDERR_FILENO, false,
+raw_stderr_ostream::raw_stderr_ostream():raw_fd_ostream(STDERR_FILENO, false,
true) {}
// An out of line virtual method to provide a home for the class vtable.
return S;
}
-//===----------------------------------------------------------------------===//
-// raw_os_ostream
-//===----------------------------------------------------------------------===//
-
-raw_os_ostream::~raw_os_ostream() {
- flush();
-}
-
-void raw_os_ostream::write_impl(const char *Ptr, size_t Size) {
- OS.write(Ptr, Size);
-}
-
-uint64_t raw_os_ostream::current_pos() { return OS.tellp(); }
-
-uint64_t raw_os_ostream::tell() {
- return (uint64_t)OS.tellp() + GetNumBytesInBuffer();
-}
//===----------------------------------------------------------------------===//
// raw_string_ostream
// raw_svector_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<char> &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();
}
+/// 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) {
- OS.append(Ptr, Ptr + 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() { return OS.size(); }
+uint64_t raw_svector_ostream::current_pos() const {
+ return OS.size();
+}
-uint64_t raw_svector_ostream::tell() {
- return OS.size() + GetNumBytesInBuffer();
+StringRef raw_svector_ostream::str() {
+ flush();
+ return StringRef(OS.begin(), OS.size());
}
//===----------------------------------------------------------------------===//
void raw_null_ostream::write_impl(const char *Ptr, size_t Size) {
}
-uint64_t raw_null_ostream::current_pos() {
+uint64_t raw_null_ostream::current_pos() const {
return 0;
}
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