mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-14 11:32:34 +00:00
d14787e497
right. - This class turns out to be much more convenient to use if we do this; clients can make sure the buffer is always big enough if they care (since our current idiom tends to be to use a SmallString<256> for the input to this we should generally be avoiding an unnecessary malloc). Also, add a convenience raw_svector_ostream::str method which flushes the buffer and returns a StringRef for the vector contents. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79446 91177308-0d34-0410-b5e6-96231b3b80d8
545 lines
16 KiB
C++
545 lines
16 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/Support/Format.h"
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#include "llvm/System/Program.h"
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#include "llvm/System/Process.h"
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#include "llvm/ADT/SmallVector.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 <ostream>
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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(_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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// If there are any pending errors, report them now. Clients wishing
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// to avoid llvm_report_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 (Error)
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llvm_report_error("IO failure on output stream.");
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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() {
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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 >= 64)) &&
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"stream must be unbuffered, or have >= 64 bytes of buffer");
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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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N = -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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N = -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::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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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 (BUILTIN_EXPECT(OutBufCur >= OutBufEnd, false)) {
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if (BUILTIN_EXPECT(!OutBufStart, false)) {
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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 (BUILTIN_EXPECT(OutBufCur+Size > OutBufEnd, false)) {
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if (BUILTIN_EXPECT(!OutBufStart, false)) {
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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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// Write out the data in buffer-sized blocks until the remainder
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// fits within the buffer.
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do {
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size_t NumBytes = OutBufEnd - OutBufCur;
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copy_to_buffer(Ptr, NumBytes);
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flush_nonempty();
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Ptr += NumBytes;
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Size -= NumBytes;
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} while (OutBufCur+Size > OutBufEnd);
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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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if (OutBufEnd-OutBufCur > 3) {
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size_t BufferBytesLeft = OutBufEnd-OutBufCur;
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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[0], 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[0], 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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//===----------------------------------------------------------------------===//
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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, bool Binary, bool Force,
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std::string &ErrorInfo) : pos(0) {
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ErrorInfo.clear();
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// Handle "-" as stdout.
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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 (Binary)
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sys::Program::ChangeStdoutToBinary();
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ShouldClose = false;
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return;
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}
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int Flags = O_WRONLY|O_CREAT|O_TRUNC;
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#ifdef O_BINARY
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if (Binary)
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Flags |= O_BINARY;
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#endif
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if (!Force)
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Flags |= O_EXCL;
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FD = open(Filename, Flags, 0664);
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if (FD < 0) {
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ErrorInfo = "Error opening output file '" + std::string(Filename) + "'";
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ShouldClose = false;
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} else {
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ShouldClose = true;
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}
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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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if (::close(FD) != 0)
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error_detected();
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}
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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.");
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pos += Size;
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if (::write(FD, Ptr, Size) != (ssize_t) Size)
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error_detected();
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}
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void raw_fd_ostream::close() {
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assert (ShouldClose);
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ShouldClose = false;
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flush();
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if (::close(FD) != 0)
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error_detected();
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FD = -1;
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}
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uint64_t raw_fd_ostream::seek(uint64_t off) {
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flush();
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pos = ::lseek(FD, off, SEEK_SET);
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if (pos != off)
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error_detected();
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return pos;
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}
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size_t raw_fd_ostream::preferred_buffer_size() {
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#if !defined(_MSC_VER) && !defined(__MINGW32__) // Windows has no st_blksize.
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assert(FD >= 0 && "File not yet open!");
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struct stat statbuf;
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if (fstat(FD, &statbuf) == 0) {
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// If this is a terminal, don't use buffering. Line buffering
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// would be a more traditional thing to do, but it's not worth
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// the complexity.
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if (S_ISCHR(statbuf.st_mode) && isatty(FD))
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return 0;
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// Return the preferred block size.
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return statbuf.st_blksize;
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}
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error_detected();
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#endif
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return raw_ostream::preferred_buffer_size();
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}
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raw_ostream &raw_fd_ostream::changeColor(enum Colors colors, bool bold,
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bool bg) {
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if (sys::Process::ColorNeedsFlush())
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flush();
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const char *colorcode =
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(colors == SAVEDCOLOR) ? sys::Process::OutputBold(bg)
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: sys::Process::OutputColor(colors, bold, bg);
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if (colorcode) {
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size_t len = strlen(colorcode);
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write(colorcode, len);
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// don't account colors towards output characters
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pos -= len;
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}
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return *this;
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}
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raw_ostream &raw_fd_ostream::resetColor() {
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if (sys::Process::ColorNeedsFlush())
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flush();
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const char *colorcode = sys::Process::ResetColor();
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if (colorcode) {
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size_t len = strlen(colorcode);
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write(colorcode, len);
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// don't account colors towards output characters
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pos -= len;
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}
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return *this;
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}
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//===----------------------------------------------------------------------===//
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// raw_stdout/err_ostream
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//===----------------------------------------------------------------------===//
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// Set buffer settings to model stdout and stderr behavior.
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// Set standard error to be unbuffered by default.
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raw_stdout_ostream::raw_stdout_ostream():raw_fd_ostream(STDOUT_FILENO, false) {}
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raw_stderr_ostream::raw_stderr_ostream():raw_fd_ostream(STDERR_FILENO, false,
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true) {}
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// An out of line virtual method to provide a home for the class vtable.
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void raw_stdout_ostream::handle() {}
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void raw_stderr_ostream::handle() {}
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/// outs() - This returns a reference to a raw_ostream for standard output.
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/// Use it like: outs() << "foo" << "bar";
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raw_ostream &llvm::outs() {
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static raw_stdout_ostream S;
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return S;
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}
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/// errs() - This returns a reference to a raw_ostream for standard error.
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/// Use it like: errs() << "foo" << "bar";
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raw_ostream &llvm::errs() {
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static raw_stderr_ostream S;
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return S;
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}
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/// nulls() - This returns a reference to a raw_ostream which discards output.
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raw_ostream &llvm::nulls() {
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static raw_null_ostream S;
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return S;
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}
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//===----------------------------------------------------------------------===//
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// raw_os_ostream
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//===----------------------------------------------------------------------===//
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raw_os_ostream::~raw_os_ostream() {
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flush();
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}
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void raw_os_ostream::write_impl(const char *Ptr, size_t Size) {
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OS.write(Ptr, Size);
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}
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uint64_t raw_os_ostream::current_pos() { return OS.tellp(); }
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//===----------------------------------------------------------------------===//
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// raw_string_ostream
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//===----------------------------------------------------------------------===//
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raw_string_ostream::~raw_string_ostream() {
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flush();
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}
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void raw_string_ostream::write_impl(const char *Ptr, size_t Size) {
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OS.append(Ptr, Size);
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}
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//===----------------------------------------------------------------------===//
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// raw_svector_ostream
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//===----------------------------------------------------------------------===//
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// The raw_svector_ostream implementation uses the SmallVector itself as the
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// buffer for the raw_ostream. We guarantee that the raw_ostream buffer is
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// always pointing past the end of the vector, but within the vector
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// capacity. This allows raw_ostream to write directly into the correct place,
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// and we only need to set the vector size when the data is flushed.
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raw_svector_ostream::raw_svector_ostream(SmallVectorImpl<char> &O) : OS(O) {
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// Set up the initial external buffer. We make sure that the buffer has at
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// least 128 bytes free; raw_ostream itself only requires 64, but we want to
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// make sure that we don't grow the buffer unnecessarily on destruction (when
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// the data is flushed). See the FIXME below.
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OS.reserve(OS.size() + 128);
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SetBuffer(OS.end(), OS.capacity() - OS.size());
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}
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raw_svector_ostream::~raw_svector_ostream() {
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// FIXME: Prevent resizing during this flush().
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flush();
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}
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void raw_svector_ostream::write_impl(const char *Ptr, size_t Size) {
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assert(Ptr == OS.end() && OS.size() + Size <= OS.capacity() &&
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"Invalid write_impl() call!");
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// We don't need to copy the bytes, just commit the bytes to the
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// SmallVector.
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OS.set_size(OS.size() + Size);
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// Grow the vector if necessary.
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if (OS.capacity() - OS.size() < 64)
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OS.reserve(OS.capacity() * 2);
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// Update the buffer position.
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SetBuffer(OS.end(), OS.capacity() - OS.size());
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}
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uint64_t raw_svector_ostream::current_pos() { return OS.size(); }
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StringRef raw_svector_ostream::str() {
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flush();
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return StringRef(OS.begin(), OS.size());
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}
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//===----------------------------------------------------------------------===//
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// raw_null_ostream
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//===----------------------------------------------------------------------===//
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raw_null_ostream::~raw_null_ostream() {
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#ifndef NDEBUG
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// ~raw_ostream asserts that the buffer is empty. This isn't necessary
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// with raw_null_ostream, but it's better to have raw_null_ostream follow
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// the rules than to change the rules just for raw_null_ostream.
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flush();
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#endif
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}
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void raw_null_ostream::write_impl(const char *Ptr, size_t Size) {
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}
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uint64_t raw_null_ostream::current_pos() {
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return 0;
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}
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