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      1 //===- CIndex.cpp - Clang-C Source Indexing 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 Clang-C Source Indexing library.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #include "CIndexer.h"
     15 
     16 #include "clang/AST/Decl.h"
     17 #include "clang/AST/DeclVisitor.h"
     18 #include "clang/AST/StmtVisitor.h"
     19 #include "clang/Basic/FileManager.h"
     20 #include "clang/Basic/SourceManager.h"
     21 #include "clang/Basic/Version.h"
     22 #include "clang/Sema/CodeCompleteConsumer.h"
     23 #include "llvm/ADT/StringExtras.h"
     24 #include "llvm/Config/config.h"
     25 #include "llvm/Support/Compiler.h"
     26 #include "llvm/Support/MemoryBuffer.h"
     27 #include "llvm/Support/raw_ostream.h"
     28 #include "llvm/Support/Program.h"
     29 
     30 #include <cstdio>
     31 #include <vector>
     32 #include <sstream>
     33 
     34 #ifdef __CYGWIN__
     35 #include <cygwin/version.h>
     36 #include <sys/cygwin.h>
     37 #define LLVM_ON_WIN32 1
     38 #endif
     39 
     40 #ifdef LLVM_ON_WIN32
     41 #include <windows.h>
     42 #else
     43 #include <dlfcn.h>
     44 #endif
     45 
     46 using namespace clang;
     47 
     48 std::string CIndexer::getClangResourcesPath() {
     49   // Did we already compute the path?
     50   if (!ResourcesPath.empty())
     51     return ResourcesPath.str();
     52 
     53   // Find the location where this library lives (libclang.dylib).
     54 #ifdef LLVM_ON_WIN32
     55   MEMORY_BASIC_INFORMATION mbi;
     56   char path[MAX_PATH];
     57   VirtualQuery((void *)(uintptr_t)clang_createTranslationUnit, &mbi,
     58                sizeof(mbi));
     59   GetModuleFileNameA((HINSTANCE)mbi.AllocationBase, path, MAX_PATH);
     60 
     61 #ifdef __CYGWIN__
     62   char w32path[MAX_PATH];
     63   strcpy(w32path, path);
     64 #if CYGWIN_VERSION_API_MAJOR > 0 || CYGWIN_VERSION_API_MINOR >= 181
     65   cygwin_conv_path(CCP_WIN_A_TO_POSIX, w32path, path, MAX_PATH);
     66 #else
     67   cygwin_conv_to_full_posix_path(w32path, path);
     68 #endif
     69 #endif
     70 
     71   llvm::sys::Path LibClangPath(path);
     72   LibClangPath.eraseComponent();
     73 #else
     74   // This silly cast below avoids a C++ warning.
     75   Dl_info info;
     76   if (dladdr((void *)(uintptr_t)clang_createTranslationUnit, &info) == 0)
     77     llvm_unreachable("Call to dladdr() failed");
     78 
     79   llvm::sys::Path LibClangPath(info.dli_fname);
     80 
     81   // We now have the CIndex directory, locate clang relative to it.
     82   LibClangPath.eraseComponent();
     83 #endif
     84 
     85   LibClangPath.appendComponent("clang");
     86   LibClangPath.appendComponent(CLANG_VERSION_STRING);
     87 
     88   // Cache our result.
     89   ResourcesPath = LibClangPath;
     90   return LibClangPath.str();
     91 }
     92 
     93 static llvm::sys::Path GetTemporaryPath() {
     94   // FIXME: This is lame; sys::Path should provide this function (in particular,
     95   // it should know how to find the temporary files dir).
     96   std::string Error;
     97   const char *TmpDir = ::getenv("TMPDIR");
     98   if (!TmpDir)
     99     TmpDir = ::getenv("TEMP");
    100   if (!TmpDir)
    101     TmpDir = ::getenv("TMP");
    102   if (!TmpDir)
    103     TmpDir = "/tmp";
    104   llvm::sys::Path P(TmpDir);
    105   P.appendComponent("remap");
    106   if (P.makeUnique(false, &Error))
    107     return llvm::sys::Path("");
    108 
    109   // FIXME: Grumble, makeUnique sometimes leaves the file around!?  PR3837.
    110   P.eraseFromDisk(false, 0);
    111 
    112   return P;
    113 }
    114 
    115 bool clang::RemapFiles(unsigned num_unsaved_files,
    116                        struct CXUnsavedFile *unsaved_files,
    117                        std::vector<std::string> &RemapArgs,
    118                        std::vector<llvm::sys::Path> &TemporaryFiles) {
    119   for (unsigned i = 0; i != num_unsaved_files; ++i) {
    120     // Write the contents of this unsaved file into the temporary file.
    121     llvm::sys::Path SavedFile(GetTemporaryPath());
    122     if (SavedFile.empty())
    123       return true;
    124 
    125     std::string ErrorInfo;
    126     llvm::raw_fd_ostream OS(SavedFile.c_str(), ErrorInfo,
    127                             llvm::raw_fd_ostream::F_Binary);
    128     if (!ErrorInfo.empty())
    129       return true;
    130 
    131     OS.write(unsaved_files[i].Contents, unsaved_files[i].Length);
    132     OS.close();
    133     if (OS.has_error()) {
    134       SavedFile.eraseFromDisk();
    135       OS.clear_error();
    136       return true;
    137     }
    138 
    139     // Remap the file.
    140     std::string RemapArg = unsaved_files[i].Filename;
    141     RemapArg += ';';
    142     RemapArg += SavedFile.str();
    143     RemapArgs.push_back("-Xclang");
    144     RemapArgs.push_back("-remap-file");
    145     RemapArgs.push_back("-Xclang");
    146     RemapArgs.push_back(RemapArg);
    147     TemporaryFiles.push_back(SavedFile);
    148   }
    149 
    150   return false;
    151 }
    152 
    153