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https://github.com/c64scene-ar/llvm-6502.git
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220c5ca8f4
Most Unix-like operating systems guarantee that the file descriptor is closed after a call to close(2), even if close comes back with EINTR. For these systems, calling close _again_ will either do nothing or close some other file descriptor open(2)'d by another thread. (Linux) However, some operating systems do not have this behavior. They require at least another call to close(2) before guaranteeing that the descriptor is closed. (HP-UX) And some operating systems have an unpredictable blend of the two behaviors! (xnu) Avoid this disaster by blocking all signals before we call close(2). This ensures that a signal will not be delivered to the thread and close(2) will not give us back EINTR. We restore the signal mask once the operation is done. N.B. This isn't a problem on Windows, it doesn't have a notion of EINTR because signals always get delivered to dedicated signal handling threads. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219189 91177308-0d34-0410-b5e6-96231b3b80d8
816 lines
24 KiB
C++
816 lines
24 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/FileSystem.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/Process.h"
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#include "llvm/Support/Program.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 <system_error>
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// <fcntl.h> may provide O_BINARY.
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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_UNISTD_H)
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# include <unistd.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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#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 && Size == 0) ||
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(Mode != Unbuffered && BufferStart && Size != 0)) &&
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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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#if __cplusplus >= 201103L && defined(__MINGW32__)
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// FIXME: It should be generic to C++11.
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if (N == 0.0 && std::signbit(N))
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return *this << "-0.000000e+00";
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#else
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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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#endif
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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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raw_ostream &raw_ostream::operator<<(const FormattedString &FS) {
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unsigned Len = FS.Str.size();
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int PadAmount = FS.Width - Len;
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if (FS.RightJustify && (PadAmount > 0))
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this->indent(PadAmount);
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this->operator<<(FS.Str);
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if (!FS.RightJustify && (PadAmount > 0))
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this->indent(PadAmount);
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return *this;
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}
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raw_ostream &raw_ostream::operator<<(const FormattedNumber &FN) {
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if (FN.Hex) {
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unsigned Nibbles = (64 - countLeadingZeros(FN.HexValue)+3)/4;
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unsigned Width = (FN.Width > Nibbles+2) ? FN.Width : Nibbles+2;
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char NumberBuffer[20] = "0x0000000000000000";
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char *EndPtr = NumberBuffer+Width;
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char *CurPtr = EndPtr;
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const char A = FN.Upper ? 'A' : 'a';
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unsigned long long N = FN.HexValue;
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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(NumberBuffer, Width);
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} else {
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// Zero is a special case.
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if (FN.DecValue == 0) {
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this->indent(FN.Width-1);
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return *this << '0';
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}
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char NumberBuffer[32];
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char *EndPtr = NumberBuffer+sizeof(NumberBuffer);
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char *CurPtr = EndPtr;
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bool Neg = (FN.DecValue < 0);
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uint64_t N = Neg ? -static_cast<uint64_t>(FN.DecValue) : FN.DecValue;
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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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int Len = EndPtr - CurPtr;
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int Pad = FN.Width - Len;
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if (Neg)
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--Pad;
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if (Pad > 0)
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this->indent(Pad);
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if (Neg)
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*this << '-';
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return write(CurPtr, Len);
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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::raw_fd_ostream(StringRef Filename, std::error_code &EC,
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sys::fs::OpenFlags Flags)
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: Error(false), UseAtomicWrites(false), pos(0) {
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EC = std::error_code();
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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 == "-") {
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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 & sys::fs::F_Text))
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sys::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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EC = sys::fs::openFileForWrite(Filename, FD, Flags);
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if (EC) {
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ShouldClose = false;
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return;
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}
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// 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 to binary mode is necessary in Win32
|
|
// to avoid undesirable linefeed conversion.
|
|
// Don't touch STDERR, or w*printf() (in assert()) would barf wide chars.
|
|
if (fd == STDOUT_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) {
|
|
flush();
|
|
if (ShouldClose && sys::Process::SafelyCloseFileDescriptor(FD))
|
|
error_detected();
|
|
}
|
|
|
|
#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.", /*GenCrashDiag=*/false);
|
|
}
|
|
|
|
|
|
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 (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();
|
|
if (sys::Process::SafelyCloseFileDescriptor(FD))
|
|
error_detected();
|
|
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 exits, 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 (Ptr == OS.end()) {
|
|
// Grow the buffer to include the scratch area without copying.
|
|
size_t NewSize = OS.size() + Size;
|
|
assert(NewSize <= OS.capacity() && "Invalid write_impl() call!");
|
|
OS.set_size(NewSize);
|
|
} else {
|
|
assert(!GetNumBytesInBuffer());
|
|
OS.append(Ptr, Ptr + Size);
|
|
}
|
|
|
|
OS.reserve(OS.size() + 64);
|
|
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;
|
|
}
|