1 //===-- FindAllSymbolsMain.cpp - find all symbols tool ----------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "FindAllSymbolsAction.h"
10 #include "STLPostfixHeaderMap.h"
11 #include "SymbolInfo.h"
12 #include "SymbolReporter.h"
13 #include "clang/ASTMatchers/ASTMatchFinder.h"
14 #include "clang/ASTMatchers/ASTMatchers.h"
15 #include "clang/Frontend/CompilerInstance.h"
16 #include "clang/Frontend/FrontendActions.h"
17 #include "clang/Lex/Preprocessor.h"
18 #include "clang/Tooling/CommonOptionsParser.h"
19 #include "clang/Tooling/Tooling.h"
20 #include "llvm/ADT/ArrayRef.h"
21 #include "llvm/ADT/SmallString.h"
22 #include "llvm/ADT/StringRef.h"
23 #include "llvm/Support/CommandLine.h"
24 #include "llvm/Support/FileSystem.h"
25 #include "llvm/Support/MemoryBuffer.h"
26 #include "llvm/Support/Path.h"
27 #include "llvm/Support/ThreadPool.h"
28 #include "llvm/Support/raw_ostream.h"
29 #include <map>
30 #include <mutex>
31 #include <set>
32 #include <string>
33 #include <system_error>
34 #include <vector>
35 
36 using namespace clang::tooling;
37 using namespace llvm;
38 using SymbolInfo = clang::find_all_symbols::SymbolInfo;
39 
40 // Apply a custom category to all command-line options so that they are the
41 // only ones displayed.
42 static cl::OptionCategory FindAllSymbolsCategory("find_all_symbols options");
43 
44 // CommonOptionsParser declares HelpMessage with a description of the common
45 // command-line options related to the compilation database and input files.
46 // It's nice to have this help message in all tools.
47 static cl::extrahelp CommonHelp(CommonOptionsParser::HelpMessage);
48 
49 // A help message for this specific tool can be added afterwards.
50 static cl::extrahelp MoreHelp("\nMore help text...");
51 
52 static cl::opt<std::string> OutputDir("output-dir", cl::desc(R"(
53 The output directory for saving the results.)"),
54                                       cl::init("."),
55                                       cl::cat(FindAllSymbolsCategory));
56 
57 static cl::opt<std::string> MergeDir("merge-dir", cl::desc(R"(
58 The directory for merging symbols.)"),
59                                      cl::init(""),
60                                      cl::cat(FindAllSymbolsCategory));
61 namespace clang {
62 namespace find_all_symbols {
63 
64 class YamlReporter : public SymbolReporter {
65 public:
reportSymbols(StringRef FileName,const SymbolInfo::SignalMap & Symbols)66   void reportSymbols(StringRef FileName,
67                      const SymbolInfo::SignalMap &Symbols) override {
68     int FD;
69     SmallString<128> ResultPath;
70     llvm::sys::fs::createUniqueFile(
71         OutputDir + "/" + llvm::sys::path::filename(FileName) + "-%%%%%%.yaml",
72         FD, ResultPath);
73     llvm::raw_fd_ostream OS(FD, /*shouldClose=*/true);
74     WriteSymbolInfosToStream(OS, Symbols);
75   }
76 };
77 
Merge(llvm::StringRef MergeDir,llvm::StringRef OutputFile)78 bool Merge(llvm::StringRef MergeDir, llvm::StringRef OutputFile) {
79   std::error_code EC;
80   SymbolInfo::SignalMap Symbols;
81   std::mutex SymbolMutex;
82   auto AddSymbols = [&](ArrayRef<SymbolAndSignals> NewSymbols) {
83     // Synchronize set accesses.
84     std::unique_lock<std::mutex> LockGuard(SymbolMutex);
85     for (const auto &Symbol : NewSymbols) {
86       Symbols[Symbol.Symbol] += Symbol.Signals;
87     }
88   };
89 
90   // Load all symbol files in MergeDir.
91   {
92     llvm::ThreadPool Pool;
93     for (llvm::sys::fs::directory_iterator Dir(MergeDir, EC), DirEnd;
94          Dir != DirEnd && !EC; Dir.increment(EC)) {
95       // Parse YAML files in parallel.
96       Pool.async(
97           [&AddSymbols](std::string Path) {
98             auto Buffer = llvm::MemoryBuffer::getFile(Path);
99             if (!Buffer) {
100               llvm::errs() << "Can't open " << Path << "\n";
101               return;
102             }
103             std::vector<SymbolAndSignals> Symbols =
104                 ReadSymbolInfosFromYAML(Buffer.get()->getBuffer());
105             for (auto &Symbol : Symbols) {
106               // Only count one occurrence per file, to avoid spam.
107               Symbol.Signals.Seen = std::min(Symbol.Signals.Seen, 1u);
108               Symbol.Signals.Used = std::min(Symbol.Signals.Used, 1u);
109             }
110             // FIXME: Merge without creating such a heavy contention point.
111             AddSymbols(Symbols);
112           },
113           Dir->path());
114     }
115   }
116 
117   llvm::raw_fd_ostream OS(OutputFile, EC, llvm::sys::fs::OF_None);
118   if (EC) {
119     llvm::errs() << "Can't open '" << OutputFile << "': " << EC.message()
120                  << '\n';
121     return false;
122   }
123   WriteSymbolInfosToStream(OS, Symbols);
124   return true;
125 }
126 
127 } // namespace clang
128 } // namespace find_all_symbols
129 
main(int argc,const char ** argv)130 int main(int argc, const char **argv) {
131   CommonOptionsParser OptionsParser(argc, argv, FindAllSymbolsCategory);
132   ClangTool Tool(OptionsParser.getCompilations(),
133                  OptionsParser.getSourcePathList());
134 
135   std::vector<std::string> sources = OptionsParser.getSourcePathList();
136   if (sources.empty()) {
137     llvm::errs() << "Must specify at least one one source file.\n";
138     return 1;
139   }
140   if (!MergeDir.empty()) {
141     clang::find_all_symbols::Merge(MergeDir, sources[0]);
142     return 0;
143   }
144 
145   clang::find_all_symbols::YamlReporter Reporter;
146 
147   auto Factory =
148       std::make_unique<clang::find_all_symbols::FindAllSymbolsActionFactory>(
149           &Reporter, clang::find_all_symbols::getSTLPostfixHeaderMap());
150   return Tool.run(Factory.get());
151 }
152