#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Format.h"
-#include "llvm/System/Program.h"
-#include "llvm/System/Process.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 "llvm/Support/Compiler.h"
#if defined(HAVE_FCNTL_H)
# include <fcntl.h>
#endif
+#if defined(HAVE_SYS_UIO_H) && defined(HAVE_WRITEV)
+# include <sys/uio.h>
+#endif
+
+#if defined(__CYGWIN__)
+#include <io.h>
+#endif
#if defined(_MSC_VER)
#include <io.h>
if (BufferMode == InternalBuffer)
delete [] OutBufStart;
-
- // 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 (Error)
- report_fatal_error("IO failure on output stream.");
}
// An out of line virtual method to provide a home for the class vtable.
}
raw_ostream &raw_ostream::operator<<(long long N) {
- if (N < 0) {
+ if (N < 0) {
*this << '-';
- N = -N;
+ // Avoid undefined behavior on INT64_MIN with a cast.
+ N = -(unsigned long long)N;
}
return this->operator<<(static_cast<unsigned long long>(N));
return write(CurPtr, EndPtr-CurPtr);
}
-raw_ostream &raw_ostream::write_escaped(StringRef Str) {
+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];
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));
+ // 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));
+ }
}
}
/// stream should be immediately destroyed; the string will be empty
/// if no error occurred.
raw_fd_ostream::raw_fd_ostream(const char *Filename, std::string &ErrorInfo,
- unsigned Flags) : pos(0) {
+ 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)) &&
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 (Flags & F_Binary)
sys::Program::ChangeStdoutToBinary();
- ShouldClose = false;
+ // Close stdout when we're done, to detect any output errors.
+ ShouldClose = true;
return;
}
if (Flags & F_Excl)
OpenFlags |= O_EXCL;
- FD = open(Filename, OpenFlags, 0664);
- if (FD < 0) {
- ErrorInfo = "Error opening output file '" + std::string(Filename) + "'";
- ShouldClose = false;
- } else {
- ShouldClose = true;
+ 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<uint64_t>(loc);
}
raw_fd_ostream::~raw_fd_ostream() {
- if (FD < 0) return;
- flush();
- if (ShouldClose)
- if (::close(FD) != 0)
- error_detected();
+ if (FD >= 0) {
+ flush();
+ if (ShouldClose)
+ while (::close(FD) != 0)
+ if (errno != EINTR) {
+ error_detected();
+ break;
+ }
+ }
+
+ // 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::write_impl(const char *Ptr, size_t Size) {
assert(FD >= 0 && "File already closed.");
pos += Size;
- ssize_t ret;
+
do {
- ret = ::write(FD, Ptr, Size);
- } while (ret < 0 && (errno == EAGAIN || errno == EINTR));
- if (ret != (ssize_t) Size)
- error_detected();
+ 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);
ShouldClose = false;
flush();
- if (::close(FD) != 0)
- error_detected();
+ while (::close(FD) != 0)
+ if (errno != EINTR) {
+ error_detected();
+ break;
+ }
FD = -1;
}
}
size_t raw_fd_ostream::preferred_buffer_size() const {
-#if !defined(_MSC_VER) && !defined(__MINGW32__) && !defined(_MINIX)
+#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;
return 0;
// Return the preferred block size.
return statbuf.st_blksize;
-#endif
+#else
return raw_ostream::preferred_buffer_size();
+#endif
}
raw_ostream &raw_fd_ostream::changeColor(enum Colors colors, bool bold,
}
//===----------------------------------------------------------------------===//
-// raw_stdout/err_ostream
+// outs(), errs(), nulls()
//===----------------------------------------------------------------------===//
-// 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,
- true) {}
-
-// An out of line virtual method to provide a home for the class vtable.
-void raw_stdout_ostream::handle() {}
-void raw_stderr_ostream::handle() {}
-
/// 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;
}
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