1 | /* |
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2 | * Copyright (c) 2017 International Characters. |
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3 | * This software is licensed to the public under the Open Software License 3.0. |
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4 | * icgrep is a trademark of International Characters. |
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5 | */ |
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6 | |
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7 | #include "grep_engine.h" |
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8 | #include "grep_interface.h" |
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9 | #include <llvm/IR/Module.h> |
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10 | #include <boost/filesystem.hpp> |
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11 | #include <UCD/resolve_properties.h> |
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12 | #include <kernels/charclasses.h> |
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13 | #include <kernels/cc_kernel.h> |
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14 | #include <kernels/grep_kernel.h> |
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15 | #include <kernels/linebreak_kernel.h> |
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16 | #include <kernels/streams_merge.h> |
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17 | #include <kernels/source_kernel.h> |
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18 | #include <kernels/s2p_kernel.h> |
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19 | #include <kernels/scanmatchgen.h> |
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20 | #include <kernels/streamset.h> |
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21 | #include <kernels/until_n.h> |
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22 | #include <kernels/kernel_builder.h> |
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23 | #include <pablo/pablo_kernel.h> |
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24 | #include <re/re_cc.h> |
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25 | #include <re/casing.h> |
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26 | #include <re/re_toolchain.h> |
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27 | #include <toolchain/toolchain.h> |
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28 | #include <re/re_name_resolve.h> |
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29 | #include <re/re_collect_unicodesets.h> |
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30 | #include <re/re_multiplex.h> |
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31 | #include <toolchain/toolchain.h> |
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32 | #include <toolchain/cpudriver.h> |
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33 | #include <iostream> |
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34 | #include <cc/multiplex_CCs.h> |
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35 | #include <llvm/Support/raw_ostream.h> |
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36 | #include <util/aligned_allocator.h> |
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37 | #include <sys/stat.h> |
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38 | #include <fcntl.h> |
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39 | #include <errno.h> |
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40 | #include <llvm/ADT/STLExtras.h> // for make_unique |
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41 | #include <llvm/Support/CommandLine.h> |
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42 | #include <llvm/Support/Debug.h> |
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43 | #include <sched.h> |
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44 | |
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45 | using namespace parabix; |
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46 | using namespace llvm; |
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47 | static cl::opt<int> Threads("t", cl::desc("Total number of threads."), cl::init(2)); |
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48 | |
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49 | namespace grep { |
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50 | |
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51 | // Grep Engine construction and initialization. |
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52 | |
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53 | GrepEngine::GrepEngine() : |
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54 | mGrepDriver(nullptr), |
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55 | mNextFileToGrep(0), |
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56 | mNextFileToPrint(0), |
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57 | grepMatchFound(false), |
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58 | mMoveMatchesToEOL(true), |
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59 | mEngineThread(pthread_self()) {} |
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60 | |
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61 | GrepEngine::~GrepEngine() { |
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62 | delete mGrepDriver; |
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63 | } |
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64 | |
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65 | QuietModeEngine::QuietModeEngine() : GrepEngine() { |
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66 | mMoveMatchesToEOL = false; |
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67 | } |
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68 | |
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69 | MatchOnlyEngine::MatchOnlyEngine(bool showFilesWithoutMatch) : |
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70 | GrepEngine(), mRequiredCount(showFilesWithoutMatch) { |
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71 | mFileSuffix = NullFlag ? std::string("\0", 1) : "\n"; |
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72 | mMoveMatchesToEOL = false; |
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73 | } |
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74 | |
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75 | CountOnlyEngine::CountOnlyEngine() : GrepEngine() { |
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76 | mFileSuffix = ":"; |
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77 | } |
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78 | |
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79 | EmitMatchesEngine::EmitMatchesEngine() : GrepEngine() { |
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80 | mFileSuffix = InitialTabFlag ? "\t:" : ":"; |
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81 | if (LineRegexpFlag) mMoveMatchesToEOL = false; |
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82 | } |
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83 | |
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84 | void GrepEngine::initFileResult(std::vector<std::string> & filenames) { |
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85 | const unsigned n = filenames.size(); |
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86 | mResultStrs.resize(n); |
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87 | mFileStatus.resize(n, FileStatus::Pending); |
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88 | inputFiles = filenames; |
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89 | } |
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90 | |
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91 | // Code Generation |
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92 | // |
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93 | // All engines share a common pipeline to compute a stream of Matches from a given input Bytestream. |
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94 | |
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95 | std::pair<StreamSetBuffer *, StreamSetBuffer *> GrepEngine::grepPipeline(std::vector<re::RE *> & REs, StreamSetBuffer * ByteStream) { |
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96 | auto & idb = mGrepDriver->getBuilder(); |
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97 | const unsigned segmentSize = codegen::SegmentSize; |
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98 | const unsigned bufferSegments = codegen::BufferSegments * codegen::ThreadNum; |
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99 | const unsigned encodingBits = 8; |
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100 | |
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101 | StreamSetBuffer * BasisBits = mGrepDriver->addBuffer<CircularBuffer>(idb, idb->getStreamSetTy(encodingBits, 1), segmentSize * bufferSegments); |
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102 | kernel::Kernel * s2pk = mGrepDriver->addKernelInstance<kernel::S2PKernel>(idb); |
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103 | mGrepDriver->makeKernelCall(s2pk, {ByteStream}, {BasisBits}); |
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104 | |
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105 | StreamSetBuffer * LineBreakStream = mGrepDriver->addBuffer<CircularBuffer>(idb, idb->getStreamSetTy(1, 1), segmentSize * bufferSegments); |
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106 | kernel::Kernel * linebreakK = mGrepDriver->addKernelInstance<kernel::LineBreakKernelBuilder>(idb, encodingBits); |
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107 | mGrepDriver->makeKernelCall(linebreakK, {BasisBits}, {LineBreakStream}); |
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108 | |
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109 | kernel::Kernel * requiredStreamsK = mGrepDriver->addKernelInstance<kernel::RequiredStreams_UTF8>(idb); |
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110 | StreamSetBuffer * RequiredStreams = mGrepDriver->addBuffer<CircularBuffer>(idb, idb->getStreamSetTy(4, 1), segmentSize * bufferSegments); |
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111 | mGrepDriver->makeKernelCall(requiredStreamsK, {BasisBits}, {RequiredStreams}); |
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112 | |
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113 | const auto n = REs.size(); |
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114 | std::vector<std::vector<re::CC *>> charclasses(n); |
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115 | for (unsigned i = 0; i < n; i++) { |
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116 | REs[i] = resolveCaseInsensitiveMode(REs[i], grep::IgnoreCaseFlag); |
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117 | REs[i] = re::resolveNames(REs[i]); |
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118 | const auto UnicodeSets = re::collectUnicodeSets(REs[i]); |
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119 | std::vector<std::vector<unsigned>> exclusiveSetIDs; |
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120 | doMultiplexCCs(UnicodeSets, exclusiveSetIDs, charclasses[i]); |
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121 | REs[i] = multiplex(REs[i], UnicodeSets, exclusiveSetIDs); |
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122 | REs[i] = regular_expression_passes(REs[i]); |
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123 | } |
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124 | |
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125 | std::vector<StreamSetBuffer *> MatchResultsBufs(n); |
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126 | |
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127 | for(unsigned i = 0; i < n; ++i){ |
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128 | const auto numOfCharacterClasses = charclasses[i].size(); |
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129 | StreamSetBuffer * CharClasses = mGrepDriver->addBuffer<CircularBuffer>(idb, idb->getStreamSetTy(numOfCharacterClasses), segmentSize * bufferSegments); |
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130 | kernel::Kernel * ccK = mGrepDriver->addKernelInstance<kernel::CharClassesKernel>(idb, std::move(charclasses[i])); |
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131 | mGrepDriver->makeKernelCall(ccK, {BasisBits}, {CharClasses}); |
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132 | StreamSetBuffer * MatchResults = mGrepDriver->addBuffer<CircularBuffer>(idb, idb->getStreamSetTy(1, 1), segmentSize * bufferSegments); |
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133 | kernel::Kernel * icgrepK = mGrepDriver->addKernelInstance<kernel::ICGrepKernel>(idb, REs[i], numOfCharacterClasses); |
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134 | mGrepDriver->makeKernelCall(icgrepK, {CharClasses, LineBreakStream, RequiredStreams}, {MatchResults}); |
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135 | MatchResultsBufs[i] = MatchResults; |
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136 | } |
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137 | StreamSetBuffer * MergedResults = MatchResultsBufs[0]; |
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138 | if (REs.size() > 1) { |
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139 | MergedResults = mGrepDriver->addBuffer<CircularBuffer>(idb, idb->getStreamSetTy(1, 1), segmentSize * bufferSegments); |
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140 | kernel::Kernel * streamsMergeK = mGrepDriver->addKernelInstance<kernel::StreamsMerge>(idb, 1, REs.size()); |
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141 | mGrepDriver->makeKernelCall(streamsMergeK, MatchResultsBufs, {MergedResults}); |
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142 | } |
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143 | StreamSetBuffer * Matches = MergedResults; |
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144 | |
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145 | if (mMoveMatchesToEOL) { |
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146 | StreamSetBuffer * OriginalMatches = Matches; |
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147 | kernel::Kernel * matchedLinesK = mGrepDriver->addKernelInstance<kernel::MatchedLinesKernel>(idb); |
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148 | Matches = mGrepDriver->addBuffer<CircularBuffer>(idb, idb->getStreamSetTy(1, 1), segmentSize * bufferSegments); |
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149 | mGrepDriver->makeKernelCall(matchedLinesK, {OriginalMatches, LineBreakStream}, {Matches}); |
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150 | } |
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151 | |
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152 | if (InvertMatchFlag) { |
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153 | kernel::Kernel * invertK = mGrepDriver->addKernelInstance<kernel::InvertMatchesKernel>(idb); |
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154 | StreamSetBuffer * OriginalMatches = Matches; |
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155 | Matches = mGrepDriver->addBuffer<CircularBuffer>(idb, idb->getStreamSetTy(1, 1), segmentSize * bufferSegments); |
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156 | mGrepDriver->makeKernelCall(invertK, {OriginalMatches, LineBreakStream}, {Matches}); |
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157 | } |
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158 | if (MaxCountFlag > 0) { |
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159 | kernel::Kernel * untilK = mGrepDriver->addKernelInstance<kernel::UntilNkernel>(idb); |
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160 | untilK->setInitialArguments({idb->getSize(MaxCountFlag)}); |
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161 | StreamSetBuffer * AllMatches = Matches; |
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162 | Matches = mGrepDriver->addBuffer<CircularBuffer>(idb, idb->getStreamSetTy(1, 1), segmentSize * bufferSegments); |
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163 | mGrepDriver->makeKernelCall(untilK, {AllMatches}, {Matches}); |
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164 | } |
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165 | return std::pair<StreamSetBuffer *, StreamSetBuffer *>(LineBreakStream, Matches); |
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166 | } |
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167 | |
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168 | // The QuietMode, MatchOnly and CountOnly engines share a common code generation main function, |
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169 | // which returns a count of the matches found (possibly subject to a MaxCount). |
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170 | // |
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171 | |
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172 | void GrepEngine::grepCodeGen(std::vector<re::RE *> REs) { |
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173 | |
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174 | assert (mGrepDriver == nullptr); |
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175 | mGrepDriver = new ParabixDriver("engine"); |
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176 | auto & idb = mGrepDriver->getBuilder(); |
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177 | Module * M = idb->getModule(); |
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178 | |
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179 | const auto segmentSize = codegen::SegmentSize; |
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180 | const auto bufferSegments = codegen::BufferSegments * codegen::ThreadNum; |
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181 | |
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182 | const unsigned encodingBits = 8; |
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183 | |
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184 | Function * mainFunc = cast<Function>(M->getOrInsertFunction("Main", idb->getInt64Ty(), idb->getInt32Ty(), nullptr)); |
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185 | mainFunc->setCallingConv(CallingConv::C); |
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186 | idb->SetInsertPoint(BasicBlock::Create(M->getContext(), "entry", mainFunc, 0)); |
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187 | auto args = mainFunc->arg_begin(); |
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188 | |
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189 | Value * const fileDescriptor = &*(args++); |
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190 | fileDescriptor->setName("fileDescriptor"); |
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191 | |
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192 | StreamSetBuffer * ByteStream = mGrepDriver->addBuffer<SourceBuffer>(idb, idb->getStreamSetTy(1, encodingBits)); |
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193 | kernel::Kernel * sourceK = mGrepDriver->addKernelInstance<kernel::FDSourceKernel>(idb, segmentSize * bufferSegments); |
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194 | sourceK->setInitialArguments({fileDescriptor}); |
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195 | mGrepDriver->makeKernelCall(sourceK, {}, {ByteStream}); |
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196 | |
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197 | StreamSetBuffer * LineBreakStream; |
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198 | StreamSetBuffer * Matches; |
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199 | std::tie(LineBreakStream, Matches) = grepPipeline(REs, ByteStream); |
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200 | |
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201 | kernel::Kernel * matchCountK = mGrepDriver->addKernelInstance<kernel::PopcountKernel>(idb); |
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202 | mGrepDriver->makeKernelCall(matchCountK, {Matches}, {}); |
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203 | mGrepDriver->generatePipelineIR(); |
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204 | idb->setKernel(matchCountK); |
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205 | Value * matchedLineCount = idb->getAccumulator("countResult"); |
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206 | matchedLineCount = idb->CreateZExt(matchedLineCount, idb->getInt64Ty()); |
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207 | mGrepDriver->deallocateBuffers(); |
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208 | idb->CreateRet(matchedLineCount); |
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209 | mGrepDriver->finalizeObject(); |
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210 | } |
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211 | |
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212 | // |
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213 | // The EmitMatches engine uses an EmitMatchesAccumulator object to concatenate together |
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214 | // matched lines. |
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215 | |
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216 | class EmitMatch : public MatchAccumulator { |
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217 | friend class EmitMatchesEngine; |
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218 | public: |
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219 | EmitMatch(std::string linePrefix, std::ostringstream & strm) : mLinePrefix(linePrefix), mLineCount(0), mTerminated(true), mResultStr(strm) {} |
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220 | void accumulate_match(const size_t lineNum, char * line_start, char * line_end) override; |
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221 | void finalize_match(char * buffer_end) override; |
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222 | protected: |
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223 | std::string mLinePrefix; |
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224 | size_t mLineCount; |
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225 | bool mTerminated; |
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226 | std::ostringstream & mResultStr; |
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227 | }; |
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228 | |
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229 | // |
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230 | // Default Report Match: lines are emitted with whatever line terminators are found in the |
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231 | // input. However, if the final line is not terminated, a new line is appended. |
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232 | // |
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233 | void EmitMatch::accumulate_match (const size_t lineNum, char * line_start, char * line_end) { |
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234 | if (WithFilenameFlag) { |
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235 | mResultStr << mLinePrefix; |
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236 | } |
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237 | if (LineNumberFlag) { |
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238 | // Internally line numbers are counted from 0. For display, adjust |
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239 | // the line number so that lines are numbered from 1. |
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240 | if (InitialTabFlag) { |
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241 | mResultStr << lineNum+1 << "\t:"; |
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242 | } |
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243 | else { |
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244 | mResultStr << lineNum+1 << ":"; |
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245 | } |
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246 | } |
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247 | size_t bytes = line_end - line_start + 1; |
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248 | mResultStr.write(line_start, bytes); |
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249 | mLineCount++; |
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250 | unsigned last_byte = *line_end; |
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251 | mTerminated = (last_byte >= 0x0A) && (last_byte <= 0x0D); |
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252 | if (LLVM_UNLIKELY(!mTerminated)) { |
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253 | if (last_byte == 0x85) { // Possible NEL terminator. |
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254 | mTerminated = (bytes >= 2) && (static_cast<unsigned>(line_end[-1]) == 0xC2); |
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255 | } |
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256 | else { |
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257 | // Possible LS or PS terminators. |
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258 | mTerminated = (bytes >= 3) && (static_cast<unsigned>(line_end[-2]) == 0xE2) |
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259 | && (static_cast<unsigned>(line_end[-1]) == 0x80) |
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260 | && ((last_byte == 0xA8) || (last_byte == 0xA9)); |
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261 | } |
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262 | } |
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263 | } |
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264 | |
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265 | void EmitMatch::finalize_match(char * buffer_end) { |
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266 | if (!mTerminated) mResultStr << "\n"; |
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267 | } |
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268 | |
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269 | void EmitMatchesEngine::grepCodeGen(std::vector<re::RE *> REs) { |
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270 | assert (mGrepDriver == nullptr); |
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271 | mGrepDriver = new ParabixDriver("engine"); |
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272 | auto & idb = mGrepDriver->getBuilder(); |
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273 | Module * M = idb->getModule(); |
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274 | |
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275 | const auto segmentSize = codegen::SegmentSize; |
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276 | const auto bufferSegments = codegen::BufferSegments * codegen::ThreadNum; |
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277 | const unsigned encodingBits = 8; |
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278 | |
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279 | Function * mainFunc = cast<Function>(M->getOrInsertFunction("Main", idb->getInt64Ty(), idb->getInt32Ty(), idb->getIntAddrTy(), nullptr)); |
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280 | mainFunc->setCallingConv(CallingConv::C); |
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281 | idb->SetInsertPoint(BasicBlock::Create(M->getContext(), "entry", mainFunc, 0)); |
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282 | auto args = mainFunc->arg_begin(); |
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283 | |
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284 | Value * const fileDescriptor = &*(args++); |
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285 | fileDescriptor->setName("fileDescriptor"); |
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286 | Value * match_accumulator = &*(args++); |
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287 | match_accumulator->setName("match_accumulator"); |
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288 | |
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289 | StreamSetBuffer * ByteStream = mGrepDriver->addBuffer<SourceBuffer>(idb, idb->getStreamSetTy(1, encodingBits)); |
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290 | kernel::Kernel * sourceK = mGrepDriver->addKernelInstance<kernel::FDSourceKernel>(idb, segmentSize * bufferSegments); |
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291 | sourceK->setInitialArguments({fileDescriptor}); |
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292 | mGrepDriver->makeKernelCall(sourceK, {}, {ByteStream}); |
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293 | |
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294 | StreamSetBuffer * LineBreakStream; |
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295 | StreamSetBuffer * Matches; |
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296 | std::tie(LineBreakStream, Matches) = grepPipeline(REs, ByteStream); |
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297 | |
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298 | kernel::Kernel * scanMatchK = mGrepDriver->addKernelInstance<kernel::ScanMatchKernel>(idb); |
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299 | scanMatchK->setInitialArguments({match_accumulator}); |
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300 | mGrepDriver->makeKernelCall(scanMatchK, {Matches, LineBreakStream, ByteStream}, {}); |
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301 | mGrepDriver->LinkFunction(*scanMatchK, "accumulate_match_wrapper", &accumulate_match_wrapper); |
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302 | mGrepDriver->LinkFunction(*scanMatchK, "finalize_match_wrapper", &finalize_match_wrapper); |
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303 | |
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304 | mGrepDriver->generatePipelineIR(); |
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305 | mGrepDriver->deallocateBuffers(); |
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306 | idb->CreateRet(idb->getInt64(0)); |
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307 | mGrepDriver->finalizeObject(); |
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308 | } |
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309 | |
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310 | |
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311 | // |
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312 | // The doGrep methods apply a GrepEngine to a single file, processing the results |
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313 | // differently based on the engine type. |
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314 | |
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315 | uint64_t GrepEngine::doGrep(const std::string & fileName, const uint32_t fileIdx) { |
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316 | typedef uint64_t (*GrepFunctionType)(int32_t fileDescriptor); |
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317 | auto f = reinterpret_cast<GrepFunctionType>(mGrepDriver->getMain()); |
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318 | |
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319 | int32_t fileDescriptor = openFile(fileName, mResultStrs[fileIdx]); |
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320 | if (fileDescriptor == -1) return 0; |
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321 | |
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322 | uint64_t grepResult = f(fileDescriptor); |
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323 | close(fileDescriptor); |
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324 | return grepResult; |
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325 | } |
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326 | |
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327 | uint64_t CountOnlyEngine::doGrep(const std::string & fileName, const uint32_t fileIdx) { |
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328 | uint64_t grepResult = GrepEngine::doGrep(fileName, fileIdx); |
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329 | if (WithFilenameFlag) mResultStrs[fileIdx] << linePrefix(fileName); |
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330 | mResultStrs[fileIdx] << grepResult << "\n"; |
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331 | return grepResult; |
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332 | } |
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333 | |
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334 | std::string GrepEngine::linePrefix(std::string fileName) { |
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335 | if (fileName == "-") { |
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336 | return LabelFlag + mFileSuffix; |
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337 | } |
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338 | else { |
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339 | return fileName + mFileSuffix; |
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340 | } |
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341 | } |
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342 | |
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343 | uint64_t MatchOnlyEngine::doGrep(const std::string & fileName, const uint32_t fileIdx) { |
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344 | uint64_t grepResult = GrepEngine::doGrep(fileName, fileIdx); |
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345 | if (grepResult == mRequiredCount) { |
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346 | mResultStrs[fileIdx] << linePrefix(fileName); |
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347 | } |
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348 | return grepResult; |
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349 | } |
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350 | |
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351 | uint64_t EmitMatchesEngine::doGrep(const std::string & fileName, const uint32_t fileIdx) { |
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352 | typedef uint64_t (*GrepFunctionType)(int32_t fileDescriptor, intptr_t accum_addr); |
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353 | auto f = reinterpret_cast<GrepFunctionType>(mGrepDriver->getMain()); |
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354 | |
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355 | int32_t fileDescriptor = openFile(fileName, mResultStrs[fileIdx]); |
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356 | if (fileDescriptor == -1) return 0; |
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357 | EmitMatch accum(linePrefix(fileName), mResultStrs[fileIdx]); |
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358 | f(fileDescriptor, reinterpret_cast<intptr_t>(&accum)); |
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359 | close(fileDescriptor); |
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360 | if (accum.mLineCount > 0) grepMatchFound = true; |
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361 | return accum.mLineCount; |
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362 | } |
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363 | |
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364 | // Open a file and return its file desciptor. |
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365 | int32_t GrepEngine::openFile(const std::string & fileName, std::ostringstream & msgstrm) { |
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366 | if (fileName == "-") { |
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367 | return STDIN_FILENO; |
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368 | } |
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369 | else { |
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370 | struct stat sb; |
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371 | int32_t fileDescriptor = open(fileName.c_str(), O_RDONLY); |
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372 | if (LLVM_UNLIKELY(fileDescriptor == -1)) { |
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373 | if (!NoMessagesFlag) { |
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374 | if (errno == EACCES) { |
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375 | msgstrm << "icgrep: " << fileName << ": Permission denied.\n"; |
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376 | } |
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377 | else if (errno == ENOENT) { |
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378 | msgstrm << "icgrep: " << fileName << ": No such file.\n"; |
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379 | } |
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380 | else { |
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381 | msgstrm << "icgrep: " << fileName << ": Failed.\n"; |
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382 | } |
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383 | } |
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384 | return fileDescriptor; |
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385 | } |
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386 | if (stat(fileName.c_str(), &sb) == 0 && S_ISDIR(sb.st_mode)) { |
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387 | if (!NoMessagesFlag) { |
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388 | msgstrm << "icgrep: " << fileName << ": Is a directory.\n"; |
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389 | } |
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390 | close(fileDescriptor); |
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391 | return -1; |
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392 | } |
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393 | return fileDescriptor; |
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394 | } |
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395 | } |
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396 | |
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397 | // The process of searching a group of files may use a sequential or a task |
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398 | // parallel approach. |
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399 | |
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400 | void * DoGrepThreadFunction(void *args) { |
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401 | return reinterpret_cast<GrepEngine *>(args)->DoGrepThreadMethod(); |
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402 | } |
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403 | |
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404 | bool GrepEngine::searchAllFiles() { |
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405 | const unsigned numOfThreads = Threads; // <- convert the command line value into an integer to allow stack allocation |
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406 | pthread_t threads[numOfThreads]; |
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407 | |
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408 | for(unsigned long i = 1; i < numOfThreads; ++i) { |
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409 | const int rc = pthread_create(&threads[i], nullptr, DoGrepThreadFunction, (void *)this); |
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410 | if (rc) { |
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411 | llvm::report_fatal_error("Failed to create thread: code " + std::to_string(rc)); |
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412 | } |
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413 | } |
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414 | // Main thread also does the work; |
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415 | |
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416 | DoGrepThreadMethod(); |
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417 | for(unsigned i = 1; i < numOfThreads; ++i) { |
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418 | void * status = nullptr; |
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419 | const int rc = pthread_join(threads[i], &status); |
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420 | if (rc) { |
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421 | llvm::report_fatal_error("Failed to join thread: code " + std::to_string(rc)); |
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422 | } |
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423 | } |
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424 | return grepMatchFound; |
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425 | } |
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426 | |
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427 | |
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428 | // DoGrep thread function. |
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429 | void * GrepEngine::DoGrepThreadMethod() { |
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430 | |
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431 | unsigned fileIdx = mNextFileToGrep++; |
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432 | while (fileIdx < inputFiles.size()) { |
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433 | const auto grepResult = doGrep(inputFiles[fileIdx], fileIdx); |
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434 | mFileStatus[fileIdx] = FileStatus::GrepComplete; |
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435 | if (grepResult > 0) { |
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436 | grepMatchFound = true; |
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437 | } |
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438 | if (QuietMode && grepMatchFound) { |
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439 | if (pthread_self() != mEngineThread) { |
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440 | pthread_exit(nullptr); |
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441 | } |
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442 | return nullptr; |
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443 | } |
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444 | fileIdx = mNextFileToGrep++; |
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445 | } |
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446 | |
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447 | unsigned printIdx = mNextFileToPrint++; |
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448 | while (printIdx < inputFiles.size()) { |
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449 | const bool readyToPrint = ((printIdx == 0) || (mFileStatus[printIdx - 1] == FileStatus::PrintComplete)) && (mFileStatus[printIdx] == FileStatus::GrepComplete); |
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450 | if (readyToPrint) { |
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451 | const auto output = mResultStrs[printIdx].str(); |
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452 | if (!output.empty()) { |
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453 | llvm::outs() << output; |
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454 | } |
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455 | mFileStatus[printIdx] = FileStatus::PrintComplete; |
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456 | printIdx = mNextFileToPrint++; |
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457 | } else { |
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458 | mGrepDriver->performIncrementalCacheCleanupStep(); |
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459 | } |
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460 | sched_yield(); |
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461 | } |
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462 | |
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463 | if (pthread_self() != mEngineThread) { |
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464 | pthread_exit(nullptr); |
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465 | } else { |
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466 | return nullptr; |
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467 | } |
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468 | } |
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469 | |
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470 | } |
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