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      1 // Copyright (C) 2017 The Android Open Source Project
      2 //
      3 // Licensed under the Apache License, Version 2.0 (the "License");
      4 // you may not use this file except in compliance with the License.
      5 // You may obtain a copy of the License at
      6 //
      7 //      http://www.apache.org/licenses/LICENSE-2.0
      8 //
      9 // Unless required by applicable law or agreed to in writing, software
     10 // distributed under the License is distributed on an "AS IS" BASIS,
     11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     12 // See the License for the specific language governing permissions and
     13 // limitations under the License.
     14 
     15 #include <header_abi_util.h>
     16 
     17 #include <llvm/Support/raw_ostream.h>
     18 #include <llvm/Support/FileSystem.h>
     19 #include <llvm/Support/Path.h>
     20 
     21 #include <set>
     22 #include <string>
     23 #include <vector>
     24 
     25 namespace abi_util {
     26 
     27 static bool ShouldSkipFile(llvm::StringRef &file_name) {
     28  // Ignore swap files and hidden files / dirs. Do not recurse into them too.
     29   // We should also not look at source files. Many projects include source
     30   // files in their exports.
     31   if (file_name.empty() || file_name.startswith(".") ||
     32       file_name.endswith(".swp") || file_name.endswith(".swo") ||
     33       file_name.endswith("#") || file_name.endswith(".cpp") ||
     34       file_name.endswith(".cc") || file_name.endswith(".c")) {
     35     return true;
     36   }
     37   return false;
     38 }
     39 
     40 std::string RealPath(const std::string &path) {
     41   char file_abs_path[PATH_MAX];
     42   if (realpath(path.c_str(), file_abs_path) == nullptr) {
     43     return "";
     44   }
     45   return file_abs_path;
     46 }
     47 
     48 bool CollectExportedHeaderSet(const std::string &dir_name,
     49                               std::set<std::string> *exported_headers) {
     50   std::error_code ec;
     51   llvm::sys::fs::recursive_directory_iterator walker(dir_name, ec);
     52   // Default construction - end of directory.
     53   llvm::sys::fs::recursive_directory_iterator end;
     54   llvm::sys::fs::file_status status;
     55   for ( ; walker != end; walker.increment(ec)) {
     56     if (ec) {
     57       llvm::errs() << "Failed to walk dir : " << dir_name << "\n";
     58       return false;
     59     }
     60 
     61     const std::string &file_path = walker->path();
     62 
     63     llvm::StringRef file_name(llvm::sys::path::filename(file_path));
     64     // Ignore swap files and hidden files / dirs. Do not recurse into them too.
     65     // We should also not look at source files. Many projects include source
     66     // files in their exports.
     67     if (ShouldSkipFile(file_name)) {
     68       walker.no_push();
     69       continue;
     70     }
     71 
     72     if (walker->status(status)) {
     73       llvm::errs() << "Failed to stat file : " << file_path << "\n";
     74       return false;
     75     }
     76 
     77     if ((status.type() != llvm::sys::fs::file_type::symlink_file) &&
     78         !llvm::sys::fs::is_regular_file(status)) {
     79       // Ignore non regular files, except symlinks.
     80       continue;
     81     }
     82 
     83     exported_headers->insert(RealPath(file_path));
     84   }
     85   return true;
     86 }
     87 
     88 std::set<std::string> CollectAllExportedHeaders(
     89     const std::vector<std::string> &exported_header_dirs) {
     90   std::set<std::string> exported_headers;
     91   for (auto &&dir : exported_header_dirs) {
     92     if (!abi_util::CollectExportedHeaderSet(dir, &exported_headers)) {
     93       llvm::errs() << "Couldn't collect exported headers\n";
     94       ::exit(1);
     95     }
     96   }
     97   return exported_headers;
     98 }
     99 
    100 } // namespace abi_util
    101