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340 lines
9.1 KiB
C++
340 lines
9.1 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/ADT/SmallVector.h"
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#include "llvm/Config/config.h"
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#include <ostream>
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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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// 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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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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if (OutBufCur >= OutBufEnd)
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flush_impl();
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*OutBufCur++ = '-';
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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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// 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 long N) {
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if (N < 0) {
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if (OutBufCur >= OutBufEnd)
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flush_impl();
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*OutBufCur++ = '-';
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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::operator<<(const void *P) {
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// FIXME: This could be much faster if it matters.
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return *this << format("%p", P);
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}
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raw_ostream &raw_ostream::write(const char *Ptr, unsigned Size) {
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if (OutBufCur+Size > OutBufEnd)
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flush_impl();
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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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// Normally the string to emit is shorter than the buffer.
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if (Size <= unsigned(OutBufEnd-OutBufStart)) {
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memcpy(OutBufCur, Ptr, Size);
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break;
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}
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// If emitting a string larger than our buffer, emit in chunks. In this
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// case we know that we just flushed the buffer.
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while (Size) {
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unsigned NumToEmit = OutBufEnd-OutBufStart;
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if (Size < NumToEmit) NumToEmit = Size;
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assert(OutBufCur == OutBufStart);
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memcpy(OutBufStart, Ptr, NumToEmit);
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Ptr += NumToEmit;
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Size -= NumToEmit;
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OutBufCur = OutBufStart + NumToEmit;
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flush_impl();
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}
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break;
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}
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OutBufCur += Size;
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return *this;
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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 formatting
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// directly onto its end.
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unsigned NextBufferSize = 127;
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if (OutBufEnd-OutBufCur > 3) {
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unsigned BufferBytesLeft = OutBufEnd-OutBufCur;
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unsigned 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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unsigned 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,
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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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FD = open(Filename, Flags, 0644);
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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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::close(FD);
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}
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}
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void raw_fd_ostream::flush_impl() {
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assert (FD >= 0 && "File already closed.");
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if (OutBufCur-OutBufStart) {
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pos += (OutBufCur - OutBufStart);
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::write(FD, OutBufStart, OutBufCur-OutBufStart);
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}
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HandleFlush();
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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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::close(FD);
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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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return pos;
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}
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//===----------------------------------------------------------------------===//
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// raw_stdout/err_ostream
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//===----------------------------------------------------------------------===//
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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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// 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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//===----------------------------------------------------------------------===//
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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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/// flush_impl - The is the piece of the class that is implemented by
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/// subclasses. This outputs the currently buffered data and resets the
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/// buffer to empty.
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void raw_os_ostream::flush_impl() {
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if (OutBufCur-OutBufStart)
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OS.write(OutBufStart, OutBufCur-OutBufStart);
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HandleFlush();
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}
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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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/// flush_impl - The is the piece of the class that is implemented by
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/// subclasses. This outputs the currently buffered data and resets the
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/// buffer to empty.
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void raw_string_ostream::flush_impl() {
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if (OutBufCur-OutBufStart)
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OS.append(OutBufStart, OutBufCur-OutBufStart);
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HandleFlush();
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}
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//===----------------------------------------------------------------------===//
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// raw_svector_ostream
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//===----------------------------------------------------------------------===//
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raw_svector_ostream::~raw_svector_ostream() {
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flush();
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}
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/// flush_impl - The is the piece of the class that is implemented by
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/// subclasses. This outputs the currently buffered data and resets the
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/// buffer to empty.
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void raw_svector_ostream::flush_impl() {
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if (OutBufCur-OutBufStart)
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OS.append(OutBufStart, OutBufCur);
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HandleFlush();
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}
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