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annotate lib/Support/DataStream.cpp @ 21:fc4a6333556f

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change error message when tail call elimination is failed.
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 14 Oct 2013 19:09:00 +0900
parents 9ad51c7bc036
children
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1 //===--- llvm/Support/DataStream.cpp - Lazy streamed data -----------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements DataStreamer, which fetches bytes of Data from
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11 // a stream source. It provides support for streaming (lazy reading) of
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12 // bitcode. An example implementation of streaming from a file or stdin
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13 // is included.
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14 //
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15 //===----------------------------------------------------------------------===//
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16
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17 #define DEBUG_TYPE "Data-stream"
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18 #include "llvm/Support/DataStream.h"
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19 #include "llvm/ADT/Statistic.h"
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20 #include "llvm/Support/Program.h"
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21 #include "llvm/Support/system_error.h"
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22 #include <cerrno>
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23 #include <cstdio>
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24 #include <string>
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25 #if !defined(_MSC_VER) && !defined(__MINGW32__)
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26 #include <unistd.h>
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27 #else
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28 #include <io.h>
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29 #endif
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30 #include <fcntl.h>
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31 using namespace llvm;
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32
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33 // Interface goals:
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34 // * StreamableMemoryObject doesn't care about complexities like using
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35 // threads/async callbacks to actually overlap download+compile
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36 // * Don't want to duplicate Data in memory
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37 // * Don't need to know total Data len in advance
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38 // Non-goals:
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39 // StreamableMemoryObject already has random access so this interface only does
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40 // in-order streaming (no arbitrary seeking, else we'd have to buffer all the
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41 // Data here in addition to MemoryObject). This also means that if we want
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42 // to be able to to free Data, BitstreamBytes/BitcodeReader will implement it
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43
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44 STATISTIC(NumStreamFetches, "Number of calls to Data stream fetch");
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45
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46 namespace llvm {
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47 DataStreamer::~DataStreamer() {}
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48 }
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49
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50 namespace {
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51
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52 // Very simple stream backed by a file. Mostly useful for stdin and debugging;
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53 // actual file access is probably still best done with mmap.
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54 class DataFileStreamer : public DataStreamer {
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55 int Fd;
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56 public:
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57 DataFileStreamer() : Fd(0) {}
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58 virtual ~DataFileStreamer() {
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59 close(Fd);
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60 }
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61 virtual size_t GetBytes(unsigned char *buf, size_t len) LLVM_OVERRIDE {
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62 NumStreamFetches++;
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63 return read(Fd, buf, len);
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64 }
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65
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66 error_code OpenFile(const std::string &Filename) {
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67 if (Filename == "-") {
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68 Fd = 0;
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69 sys::Program::ChangeStdinToBinary();
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70 return error_code::success();
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71 }
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72
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73 int OpenFlags = O_RDONLY;
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74 #ifdef O_BINARY
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75 OpenFlags |= O_BINARY; // Open input file in binary mode on win32.
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76 #endif
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77 Fd = ::open(Filename.c_str(), OpenFlags);
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78 if (Fd == -1)
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79 return error_code(errno, posix_category());
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80 return error_code::success();
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81 }
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82 };
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83
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84 }
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85
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86 namespace llvm {
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87 DataStreamer *getDataFileStreamer(const std::string &Filename,
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88 std::string *StrError) {
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89 DataFileStreamer *s = new DataFileStreamer();
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90 if (error_code e = s->OpenFile(Filename)) {
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91 *StrError = std::string("Could not open ") + Filename + ": " +
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92 e.message() + "\n";
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93 return NULL;
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94 }
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95 return s;
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96 }
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97
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98 }