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      1 //===- ARCMigrate.cpp - Clang-C ARC Migration Library ---------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // This file implements the main API hooks in the Clang-C ARC Migration library.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #include "clang-c/Index.h"
     15 #include "CXString.h"
     16 #include "clang/ARCMigrate/ARCMT.h"
     17 #include "clang/Frontend/TextDiagnosticBuffer.h"
     18 #include "llvm/Support/FileSystem.h"
     19 
     20 using namespace clang;
     21 using namespace arcmt;
     22 
     23 namespace {
     24 
     25 struct Remap {
     26   std::vector<std::pair<std::string, std::string> > Vec;
     27 };
     28 
     29 } // anonymous namespace.
     30 
     31 //===----------------------------------------------------------------------===//
     32 // libClang public APIs.
     33 //===----------------------------------------------------------------------===//
     34 
     35 extern "C" {
     36 
     37 CXRemapping clang_getRemappings(const char *migrate_dir_path) {
     38   bool Logging = ::getenv("LIBCLANG_LOGGING");
     39 
     40   if (!migrate_dir_path) {
     41     if (Logging)
     42       llvm::errs() << "clang_getRemappings was called with NULL parameter\n";
     43     return nullptr;
     44   }
     45 
     46   bool exists = false;
     47   llvm::sys::fs::exists(migrate_dir_path, exists);
     48   if (!exists) {
     49     if (Logging) {
     50       llvm::errs() << "Error by clang_getRemappings(\"" << migrate_dir_path
     51                    << "\")\n";
     52       llvm::errs() << "\"" << migrate_dir_path << "\" does not exist\n";
     53     }
     54     return nullptr;
     55   }
     56 
     57   TextDiagnosticBuffer diagBuffer;
     58   std::unique_ptr<Remap> remap(new Remap());
     59 
     60   bool err = arcmt::getFileRemappings(remap->Vec, migrate_dir_path,&diagBuffer);
     61 
     62   if (err) {
     63     if (Logging) {
     64       llvm::errs() << "Error by clang_getRemappings(\"" << migrate_dir_path
     65                    << "\")\n";
     66       for (TextDiagnosticBuffer::const_iterator
     67              I = diagBuffer.err_begin(), E = diagBuffer.err_end(); I != E; ++I)
     68         llvm::errs() << I->second << '\n';
     69     }
     70     return nullptr;
     71   }
     72 
     73   return remap.release();
     74 }
     75 
     76 CXRemapping clang_getRemappingsFromFileList(const char **filePaths,
     77                                             unsigned numFiles) {
     78   bool Logging = ::getenv("LIBCLANG_LOGGING");
     79 
     80   std::unique_ptr<Remap> remap(new Remap());
     81 
     82   if (numFiles == 0) {
     83     if (Logging)
     84       llvm::errs() << "clang_getRemappingsFromFileList was called with "
     85                       "numFiles=0\n";
     86     return remap.release();
     87   }
     88 
     89   if (!filePaths) {
     90     if (Logging)
     91       llvm::errs() << "clang_getRemappingsFromFileList was called with "
     92                       "NULL filePaths\n";
     93     return nullptr;
     94   }
     95 
     96   TextDiagnosticBuffer diagBuffer;
     97   SmallVector<StringRef, 32> Files;
     98   for (unsigned i = 0; i != numFiles; ++i)
     99     Files.push_back(filePaths[i]);
    100 
    101   bool err = arcmt::getFileRemappingsFromFileList(remap->Vec, Files,
    102                                                   &diagBuffer);
    103 
    104   if (err) {
    105     if (Logging) {
    106       llvm::errs() << "Error by clang_getRemappingsFromFileList\n";
    107       for (TextDiagnosticBuffer::const_iterator
    108              I = diagBuffer.err_begin(), E = diagBuffer.err_end(); I != E; ++I)
    109         llvm::errs() << I->second << '\n';
    110     }
    111     return remap.release();
    112   }
    113 
    114   return remap.release();
    115 }
    116 
    117 unsigned clang_remap_getNumFiles(CXRemapping map) {
    118   return static_cast<Remap *>(map)->Vec.size();
    119 
    120 }
    121 
    122 void clang_remap_getFilenames(CXRemapping map, unsigned index,
    123                               CXString *original, CXString *transformed) {
    124   if (original)
    125     *original = cxstring::createDup(
    126                     static_cast<Remap *>(map)->Vec[index].first);
    127   if (transformed)
    128     *transformed = cxstring::createDup(
    129                     static_cast<Remap *>(map)->Vec[index].second);
    130 }
    131 
    132 void clang_remap_dispose(CXRemapping map) {
    133   delete static_cast<Remap *>(map);
    134 }
    135 
    136 } // end: extern "C"
    137