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the suggestion of resistor. If this breaks some other platform, please go ahead and back this out. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55106 91177308-0d34-0410-b5e6-96231b3b80d8
246 lines
7.1 KiB
C++
246 lines
7.1 KiB
C++
//===--- raw_ostream.h - Raw output stream --------------------------------===//
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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 file defines the raw_ostream class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_RAW_OSTREAM_H
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#define LLVM_SUPPORT_RAW_OSTREAM_H
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#include "llvm/ADT/StringExtras.h"
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#include <cassert>
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#include <cstring>
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#include <string>
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#include <iosfwd>
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namespace llvm {
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/// raw_ostream - This class implements an extremely fast bulk output stream
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/// that can *only* output to a stream. It does not support seeking, reopening,
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/// rewinding, line buffered disciplines etc. It is a simple buffer that outputs
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/// a chunk at a time.
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class raw_ostream {
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protected:
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char *OutBufStart, *OutBufEnd, *OutBufCur;
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public:
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raw_ostream() {
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// Start out ready to flush.
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OutBufStart = OutBufEnd = OutBufCur = 0;
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}
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virtual ~raw_ostream() {}
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//===--------------------------------------------------------------------===//
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// Configuration Interface
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//===--------------------------------------------------------------------===//
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/// SetBufferSize - Set the internal buffer size to the specified amount
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/// instead of the default.
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void SetBufferSize(unsigned Size) {
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assert(Size >= 64 &&
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"Buffer size must be somewhat large for invariants to hold");
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flush();
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delete [] OutBufStart;
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OutBufStart = new char[Size];
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OutBufEnd = OutBufStart+Size;
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OutBufCur = OutBufStart;
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}
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//===--------------------------------------------------------------------===//
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// Data Output Interface
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//===--------------------------------------------------------------------===//
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void flush() {
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if (OutBufCur != OutBufStart)
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flush_impl();
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}
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raw_ostream &operator<<(char C) {
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if (OutBufCur >= OutBufEnd)
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flush_impl();
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*OutBufCur++ = C;
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return *this;
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}
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raw_ostream &operator<<(const char *Str) {
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return write(Str, strlen(Str));
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}
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raw_ostream &operator<<(const std::string& Str) {
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return write(Str.data(), Str.length());
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}
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raw_ostream &operator<<(uint64_t 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 &operator<<(int64_t 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<uint64_t>(N));
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}
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raw_ostream &operator<<(uint32_t N) {
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return this->operator<<(static_cast<uint64_t>(N));
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}
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raw_ostream &operator<<(int32_t N) {
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return this->operator<<(static_cast<int64_t>(N));
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}
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raw_ostream &operator<<(double N) {
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return this->operator<<(ftostr(N));
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}
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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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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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//===--------------------------------------------------------------------===//
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// Subclass Interface
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//===--------------------------------------------------------------------===//
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protected:
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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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virtual void flush_impl() = 0;
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/// HandleFlush - A stream's implementation of flush should call this after
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/// emitting the bytes to the data sink.
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void HandleFlush() {
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if (OutBufStart == 0)
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SetBufferSize(4096);
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OutBufCur = OutBufStart;
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}
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private:
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// An out of line virtual method to provide a home for the class vtable.
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virtual void handle();
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};
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/// raw_fd_ostream - A raw_ostream that writes to a file descriptor.
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///
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class raw_fd_ostream : public raw_ostream {
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int FD;
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bool ShouldClose;
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public:
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/// raw_fd_ostream - Open the specified file for writing. If an error occurs,
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/// information about the error is put into ErrorInfo, and the stream should
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/// be immediately destroyed.
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raw_fd_ostream(const char *Filename, std::string &ErrorInfo);
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/// raw_fd_ostream ctor - FD is the file descriptor that this writes to. If
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/// ShouldClose is true, this closes the file when
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raw_fd_ostream(int fd, bool shouldClose) : FD(fd), ShouldClose(shouldClose) {}
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~raw_fd_ostream();
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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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virtual void flush_impl();
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};
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/// raw_stdout_ostream - This is a stream that always prints to stdout.
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///
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class raw_stdout_ostream : public raw_fd_ostream {
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// An out of line virtual method to provide a home for the class vtable.
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virtual void handle();
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public:
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raw_stdout_ostream();
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};
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/// raw_stderr_ostream - This is a stream that always prints to stderr.
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///
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class raw_stderr_ostream : public raw_fd_ostream {
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// An out of line virtual method to provide a home for the class vtable.
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virtual void handle();
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public:
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raw_stderr_ostream();
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};
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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 &outs();
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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 &errs();
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/// raw_os_ostream - A raw_ostream that writes to an std::ostream. This is a
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/// simple adaptor class.
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class raw_os_ostream : public raw_ostream {
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std::ostream &OS;
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public:
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raw_os_ostream(std::ostream &O) : OS(O) {}
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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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virtual void flush_impl();
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};
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} // end llvm namespace
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#endif
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