f785676f2a
all of the features in the current working draft of the upcoming C++ standard, provisionally named C++1y. The code generator's performance is greatly increased, and the loop auto-vectorizer is now enabled at -Os and -O2 in addition to -O3. The PowerPC backend has made several major improvements to code generation quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ backends have all seen major feature work. Release notes for llvm and clang can be found here: <http://llvm.org/releases/3.4/docs/ReleaseNotes.html> <http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html> MFC after: 1 month
92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
//===--- llvm/Support/DataStream.cpp - Lazy streamed data -----------------===//
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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 implements DataStreamer, which fetches bytes of Data from
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// a stream source. It provides support for streaming (lazy reading) of
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// bitcode. An example implementation of streaming from a file or stdin
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// is included.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "Data-stream"
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#include "llvm/Support/DataStream.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Program.h"
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#include "llvm/Support/system_error.h"
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#include <cerrno>
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#include <cstdio>
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#include <string>
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#if !defined(_MSC_VER) && !defined(__MINGW32__)
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#include <unistd.h>
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#else
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#include <io.h>
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#endif
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using namespace llvm;
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// Interface goals:
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// * StreamableMemoryObject doesn't care about complexities like using
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// threads/async callbacks to actually overlap download+compile
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// * Don't want to duplicate Data in memory
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// * Don't need to know total Data len in advance
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// Non-goals:
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// StreamableMemoryObject already has random access so this interface only does
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// in-order streaming (no arbitrary seeking, else we'd have to buffer all the
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// Data here in addition to MemoryObject). This also means that if we want
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// to be able to to free Data, BitstreamBytes/BitcodeReader will implement it
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STATISTIC(NumStreamFetches, "Number of calls to Data stream fetch");
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namespace llvm {
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DataStreamer::~DataStreamer() {}
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}
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namespace {
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// Very simple stream backed by a file. Mostly useful for stdin and debugging;
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// actual file access is probably still best done with mmap.
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class DataFileStreamer : public DataStreamer {
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int Fd;
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public:
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DataFileStreamer() : Fd(0) {}
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virtual ~DataFileStreamer() {
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close(Fd);
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}
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virtual size_t GetBytes(unsigned char *buf, size_t len) LLVM_OVERRIDE {
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NumStreamFetches++;
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return read(Fd, buf, len);
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}
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error_code OpenFile(const std::string &Filename) {
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if (Filename == "-") {
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Fd = 0;
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sys::ChangeStdinToBinary();
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return error_code::success();
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}
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return sys::fs::openFileForRead(Filename, Fd);
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}
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};
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}
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namespace llvm {
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DataStreamer *getDataFileStreamer(const std::string &Filename,
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std::string *StrError) {
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DataFileStreamer *s = new DataFileStreamer();
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if (error_code e = s->OpenFile(Filename)) {
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*StrError = std::string("Could not open ") + Filename + ": " +
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e.message() + "\n";
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return NULL;
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}
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return s;
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}
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}
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