139f7f9bf5
upcoming 3.3 release (branching and freezing expected in a few weeks). Preliminary release notes can be found at the usual location: <http://llvm.org/docs/ReleaseNotes.html> An MFC is planned once the actual 3.3 release is finished.
790 lines
23 KiB
C++
790 lines
23 KiB
C++
//===--- raw_ostream.cpp - Implement the raw_ostream classes --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This implements support for bulk buffered stream output.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Config/config.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/Process.h"
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#include "llvm/Support/Program.h"
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#include "llvm/Support/system_error.h"
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#include <cctype>
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#include <cerrno>
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#include <sys/stat.h>
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#include <sys/types.h>
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#if defined(HAVE_UNISTD_H)
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# include <unistd.h>
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#endif
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#if defined(HAVE_FCNTL_H)
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# include <fcntl.h>
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#endif
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#if defined(HAVE_SYS_UIO_H) && defined(HAVE_WRITEV)
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# include <sys/uio.h>
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#endif
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#if defined(__CYGWIN__)
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#include <io.h>
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#endif
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#if defined(_MSC_VER)
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#include <io.h>
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#include <fcntl.h>
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#ifndef STDIN_FILENO
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# define STDIN_FILENO 0
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#endif
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#ifndef STDOUT_FILENO
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# define STDOUT_FILENO 1
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#endif
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#ifndef STDERR_FILENO
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# define STDERR_FILENO 2
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#endif
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#endif
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using namespace llvm;
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raw_ostream::~raw_ostream() {
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// raw_ostream's subclasses should take care to flush the buffer
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// in their destructors.
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assert(OutBufCur == OutBufStart &&
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"raw_ostream destructor called with non-empty buffer!");
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if (BufferMode == InternalBuffer)
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delete [] OutBufStart;
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}
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// An out of line virtual method to provide a home for the class vtable.
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void raw_ostream::handle() {}
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size_t raw_ostream::preferred_buffer_size() const {
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// BUFSIZ is intended to be a reasonable default.
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return BUFSIZ;
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}
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void raw_ostream::SetBuffered() {
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// Ask the subclass to determine an appropriate buffer size.
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if (size_t Size = preferred_buffer_size())
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SetBufferSize(Size);
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else
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// It may return 0, meaning this stream should be unbuffered.
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SetUnbuffered();
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}
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void raw_ostream::SetBufferAndMode(char *BufferStart, size_t Size,
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BufferKind Mode) {
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assert(((Mode == Unbuffered && BufferStart == 0 && Size == 0) ||
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(Mode != Unbuffered && BufferStart && Size)) &&
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"stream must be unbuffered or have at least one byte");
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// Make sure the current buffer is free of content (we can't flush here; the
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// child buffer management logic will be in write_impl).
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assert(GetNumBytesInBuffer() == 0 && "Current buffer is non-empty!");
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if (BufferMode == InternalBuffer)
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delete [] OutBufStart;
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OutBufStart = BufferStart;
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OutBufEnd = OutBufStart+Size;
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OutBufCur = OutBufStart;
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BufferMode = Mode;
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assert(OutBufStart <= OutBufEnd && "Invalid size!");
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}
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raw_ostream &raw_ostream::operator<<(unsigned long N) {
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// Zero is a special case.
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if (N == 0)
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return *this << '0';
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char NumberBuffer[20];
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char *EndPtr = NumberBuffer+sizeof(NumberBuffer);
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char *CurPtr = EndPtr;
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while (N) {
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*--CurPtr = '0' + char(N % 10);
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N /= 10;
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}
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return write(CurPtr, EndPtr-CurPtr);
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}
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raw_ostream &raw_ostream::operator<<(long N) {
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if (N < 0) {
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*this << '-';
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// Avoid undefined behavior on LONG_MIN with a cast.
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N = -(unsigned long)N;
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}
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return this->operator<<(static_cast<unsigned long>(N));
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}
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raw_ostream &raw_ostream::operator<<(unsigned long long N) {
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// Output using 32-bit div/mod when possible.
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if (N == static_cast<unsigned long>(N))
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return this->operator<<(static_cast<unsigned long>(N));
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char NumberBuffer[20];
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char *EndPtr = NumberBuffer+sizeof(NumberBuffer);
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char *CurPtr = EndPtr;
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while (N) {
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*--CurPtr = '0' + char(N % 10);
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N /= 10;
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}
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return write(CurPtr, EndPtr-CurPtr);
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}
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raw_ostream &raw_ostream::operator<<(long long N) {
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if (N < 0) {
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*this << '-';
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// Avoid undefined behavior on INT64_MIN with a cast.
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N = -(unsigned long long)N;
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}
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return this->operator<<(static_cast<unsigned long long>(N));
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}
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raw_ostream &raw_ostream::write_hex(unsigned long long N) {
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// Zero is a special case.
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if (N == 0)
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return *this << '0';
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char NumberBuffer[20];
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char *EndPtr = NumberBuffer+sizeof(NumberBuffer);
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char *CurPtr = EndPtr;
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while (N) {
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uintptr_t x = N % 16;
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*--CurPtr = (x < 10 ? '0' + x : 'a' + x - 10);
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N /= 16;
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}
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return write(CurPtr, EndPtr-CurPtr);
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}
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raw_ostream &raw_ostream::write_escaped(StringRef Str,
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bool UseHexEscapes) {
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for (unsigned i = 0, e = Str.size(); i != e; ++i) {
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unsigned char c = Str[i];
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switch (c) {
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case '\\':
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*this << '\\' << '\\';
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break;
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case '\t':
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*this << '\\' << 't';
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break;
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case '\n':
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*this << '\\' << 'n';
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break;
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case '"':
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*this << '\\' << '"';
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break;
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default:
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if (std::isprint(c)) {
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*this << c;
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break;
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}
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// Write out the escaped representation.
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if (UseHexEscapes) {
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*this << '\\' << 'x';
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*this << hexdigit((c >> 4 & 0xF));
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*this << hexdigit((c >> 0) & 0xF);
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} else {
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// Always use a full 3-character octal escape.
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*this << '\\';
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*this << char('0' + ((c >> 6) & 7));
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*this << char('0' + ((c >> 3) & 7));
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*this << char('0' + ((c >> 0) & 7));
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}
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}
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}
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return *this;
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}
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raw_ostream &raw_ostream::operator<<(const void *P) {
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*this << '0' << 'x';
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return write_hex((uintptr_t) P);
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}
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raw_ostream &raw_ostream::operator<<(double N) {
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#ifdef _WIN32
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// On MSVCRT and compatible, output of %e is incompatible to Posix
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// by default. Number of exponent digits should be at least 2. "%+03d"
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// FIXME: Implement our formatter to here or Support/Format.h!
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int fpcl = _fpclass(N);
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// negative zero
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if (fpcl == _FPCLASS_NZ)
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return *this << "-0.000000e+00";
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char buf[16];
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unsigned len;
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len = snprintf(buf, sizeof(buf), "%e", N);
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if (len <= sizeof(buf) - 2) {
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if (len >= 5 && buf[len - 5] == 'e' && buf[len - 3] == '0') {
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int cs = buf[len - 4];
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if (cs == '+' || cs == '-') {
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int c1 = buf[len - 2];
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int c0 = buf[len - 1];
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if (isdigit(static_cast<unsigned char>(c1)) &&
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isdigit(static_cast<unsigned char>(c0))) {
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// Trim leading '0': "...e+012" -> "...e+12\0"
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buf[len - 3] = c1;
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buf[len - 2] = c0;
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buf[--len] = 0;
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}
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}
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}
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return this->operator<<(buf);
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}
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#endif
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return this->operator<<(format("%e", N));
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}
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void raw_ostream::flush_nonempty() {
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assert(OutBufCur > OutBufStart && "Invalid call to flush_nonempty.");
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size_t Length = OutBufCur - OutBufStart;
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OutBufCur = OutBufStart;
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write_impl(OutBufStart, Length);
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}
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raw_ostream &raw_ostream::write(unsigned char C) {
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// Group exceptional cases into a single branch.
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if (LLVM_UNLIKELY(OutBufCur >= OutBufEnd)) {
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if (LLVM_UNLIKELY(!OutBufStart)) {
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if (BufferMode == Unbuffered) {
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write_impl(reinterpret_cast<char*>(&C), 1);
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return *this;
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}
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// Set up a buffer and start over.
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SetBuffered();
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return write(C);
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}
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flush_nonempty();
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}
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*OutBufCur++ = C;
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return *this;
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}
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raw_ostream &raw_ostream::write(const char *Ptr, size_t Size) {
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// Group exceptional cases into a single branch.
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if (LLVM_UNLIKELY(size_t(OutBufEnd - OutBufCur) < Size)) {
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if (LLVM_UNLIKELY(!OutBufStart)) {
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if (BufferMode == Unbuffered) {
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write_impl(Ptr, Size);
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return *this;
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}
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// Set up a buffer and start over.
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SetBuffered();
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return write(Ptr, Size);
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}
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size_t NumBytes = OutBufEnd - OutBufCur;
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// If the buffer is empty at this point we have a string that is larger
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// than the buffer. Directly write the chunk that is a multiple of the
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// preferred buffer size and put the remainder in the buffer.
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if (LLVM_UNLIKELY(OutBufCur == OutBufStart)) {
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size_t BytesToWrite = Size - (Size % NumBytes);
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write_impl(Ptr, BytesToWrite);
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size_t BytesRemaining = Size - BytesToWrite;
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if (BytesRemaining > size_t(OutBufEnd - OutBufCur)) {
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// Too much left over to copy into our buffer.
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return write(Ptr + BytesToWrite, BytesRemaining);
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}
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copy_to_buffer(Ptr + BytesToWrite, BytesRemaining);
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return *this;
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}
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// We don't have enough space in the buffer to fit the string in. Insert as
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// much as possible, flush and start over with the remainder.
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copy_to_buffer(Ptr, NumBytes);
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flush_nonempty();
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return write(Ptr + NumBytes, Size - NumBytes);
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}
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copy_to_buffer(Ptr, Size);
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return *this;
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}
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void raw_ostream::copy_to_buffer(const char *Ptr, size_t Size) {
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assert(Size <= size_t(OutBufEnd - OutBufCur) && "Buffer overrun!");
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// Handle short strings specially, memcpy isn't very good at very short
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// strings.
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switch (Size) {
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case 4: OutBufCur[3] = Ptr[3]; // FALL THROUGH
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case 3: OutBufCur[2] = Ptr[2]; // FALL THROUGH
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case 2: OutBufCur[1] = Ptr[1]; // FALL THROUGH
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case 1: OutBufCur[0] = Ptr[0]; // FALL THROUGH
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case 0: break;
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default:
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memcpy(OutBufCur, Ptr, Size);
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break;
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}
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OutBufCur += Size;
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}
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// Formatted output.
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raw_ostream &raw_ostream::operator<<(const format_object_base &Fmt) {
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// If we have more than a few bytes left in our output buffer, try
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// formatting directly onto its end.
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size_t NextBufferSize = 127;
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size_t BufferBytesLeft = OutBufEnd - OutBufCur;
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if (BufferBytesLeft > 3) {
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size_t BytesUsed = Fmt.print(OutBufCur, BufferBytesLeft);
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// Common case is that we have plenty of space.
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if (BytesUsed <= BufferBytesLeft) {
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OutBufCur += BytesUsed;
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return *this;
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}
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// Otherwise, we overflowed and the return value tells us the size to try
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// again with.
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NextBufferSize = BytesUsed;
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}
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// If we got here, we didn't have enough space in the output buffer for the
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// string. Try printing into a SmallVector that is resized to have enough
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// space. Iterate until we win.
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SmallVector<char, 128> V;
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while (1) {
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V.resize(NextBufferSize);
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// Try formatting into the SmallVector.
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size_t BytesUsed = Fmt.print(V.data(), NextBufferSize);
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// If BytesUsed fit into the vector, we win.
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if (BytesUsed <= NextBufferSize)
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return write(V.data(), BytesUsed);
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// Otherwise, try again with a new size.
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assert(BytesUsed > NextBufferSize && "Didn't grow buffer!?");
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NextBufferSize = BytesUsed;
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}
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}
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/// indent - Insert 'NumSpaces' spaces.
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raw_ostream &raw_ostream::indent(unsigned NumSpaces) {
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static const char Spaces[] = " "
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" "
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" ";
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// Usually the indentation is small, handle it with a fastpath.
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if (NumSpaces < array_lengthof(Spaces))
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return write(Spaces, NumSpaces);
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while (NumSpaces) {
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unsigned NumToWrite = std::min(NumSpaces,
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(unsigned)array_lengthof(Spaces)-1);
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write(Spaces, NumToWrite);
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NumSpaces -= NumToWrite;
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}
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return *this;
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}
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//===----------------------------------------------------------------------===//
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// Formatted Output
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//===----------------------------------------------------------------------===//
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// Out of line virtual method.
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void format_object_base::home() {
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}
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//===----------------------------------------------------------------------===//
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// raw_fd_ostream
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//===----------------------------------------------------------------------===//
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/// raw_fd_ostream - Open the specified file for writing. If an error
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/// occurs, information about the error is put into ErrorInfo, and the
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/// stream should be immediately destroyed; the string will be empty
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/// if no error occurred.
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raw_fd_ostream::raw_fd_ostream(const char *Filename, std::string &ErrorInfo,
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unsigned Flags)
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: Error(false), UseAtomicWrites(false), pos(0)
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{
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assert(Filename != 0 && "Filename is null");
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// Verify that we don't have both "append" and "excl".
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assert((!(Flags & F_Excl) || !(Flags & F_Append)) &&
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"Cannot specify both 'excl' and 'append' file creation flags!");
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ErrorInfo.clear();
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// Handle "-" as stdout. Note that when we do this, we consider ourself
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// the owner of stdout. This means that we can do things like close the
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// file descriptor when we're done and set the "binary" flag globally.
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if (Filename[0] == '-' && Filename[1] == 0) {
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FD = STDOUT_FILENO;
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// If user requested binary then put stdout into binary mode if
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// possible.
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if (Flags & F_Binary)
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sys::Program::ChangeStdoutToBinary();
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// Close stdout when we're done, to detect any output errors.
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ShouldClose = true;
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return;
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}
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int OpenFlags = O_WRONLY|O_CREAT;
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#ifdef O_BINARY
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if (Flags & F_Binary)
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OpenFlags |= O_BINARY;
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#endif
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if (Flags & F_Append)
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OpenFlags |= O_APPEND;
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else
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OpenFlags |= O_TRUNC;
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if (Flags & F_Excl)
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OpenFlags |= O_EXCL;
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while ((FD = open(Filename, OpenFlags, 0664)) < 0) {
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if (errno != EINTR) {
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ErrorInfo = "Error opening output file '" + std::string(Filename) + "'";
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ShouldClose = false;
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return;
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}
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}
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// Ok, we successfully opened the file, so it'll need to be closed.
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ShouldClose = true;
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}
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/// raw_fd_ostream ctor - FD is the file descriptor that this writes to. If
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/// ShouldClose is true, this closes the file when the stream is destroyed.
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raw_fd_ostream::raw_fd_ostream(int fd, bool shouldClose, bool unbuffered)
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: raw_ostream(unbuffered), FD(fd),
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ShouldClose(shouldClose), Error(false), UseAtomicWrites(false) {
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#ifdef O_BINARY
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// Setting STDOUT and STDERR to binary mode is necessary in Win32
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// to avoid undesirable linefeed conversion.
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if (fd == STDOUT_FILENO || fd == STDERR_FILENO)
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setmode(fd, O_BINARY);
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#endif
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// Get the starting position.
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off_t loc = ::lseek(FD, 0, SEEK_CUR);
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if (loc == (off_t)-1)
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pos = 0;
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else
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pos = static_cast<uint64_t>(loc);
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}
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raw_fd_ostream::~raw_fd_ostream() {
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if (FD >= 0) {
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flush();
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if (ShouldClose)
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while (::close(FD) != 0)
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if (errno != EINTR) {
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error_detected();
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break;
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}
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}
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#ifdef __MINGW32__
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// On mingw, global dtors should not call exit().
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// report_fatal_error() invokes exit(). We know report_fatal_error()
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// might not write messages to stderr when any errors were detected
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// on FD == 2.
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if (FD == 2) return;
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#endif
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// If there are any pending errors, report them now. Clients wishing
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// to avoid report_fatal_error calls should check for errors with
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// has_error() and clear the error flag with clear_error() before
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// destructing raw_ostream objects which may have errors.
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if (has_error())
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report_fatal_error("IO failure on output stream.", /*GenCrashDiag=*/false);
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}
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void raw_fd_ostream::write_impl(const char *Ptr, size_t Size) {
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assert(FD >= 0 && "File already closed.");
|
|
pos += Size;
|
|
|
|
do {
|
|
ssize_t ret;
|
|
|
|
// Check whether we should attempt to use atomic writes.
|
|
if (LLVM_LIKELY(!UseAtomicWrites)) {
|
|
ret = ::write(FD, Ptr, Size);
|
|
} else {
|
|
// Use ::writev() where available.
|
|
#if defined(HAVE_WRITEV)
|
|
const void *Addr = static_cast<const void *>(Ptr);
|
|
struct iovec IOV = {const_cast<void *>(Addr), 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();
|
|
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);
|
|
if (pos != off)
|
|
error_detected();
|
|
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,
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
raw_ostream &raw_fd_ostream::reverseColor() {
|
|
if (sys::Process::ColorNeedsFlush())
|
|
flush();
|
|
const char *colorcode = sys::Process::OutputReverse();
|
|
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);
|
|
}
|
|
|
|
bool raw_fd_ostream::has_colors() const {
|
|
return sys::Process::FileDescriptorHasColors(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() {
|
|
// 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() {
|
|
// 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_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
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// 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) {
|
|
// 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_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;
|
|
}
|