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 #include "clang/Basic/LLVM.h"
16 #include "clang/Basic/Version.h"
17 #include "llvm/ADT/SmallString.h"
18 #include "llvm/Config/llvm-config.h"
19 #include "llvm/Support/Path.h"
20 #include "llvm/Support/Program.h"
21 #include <cstdio>
22 
23 #ifdef __CYGWIN__
24 #include <cygwin/version.h>
25 #include <sys/cygwin.h>
26 #define LLVM_ON_WIN32 1
27 #endif
28 
29 #ifdef LLVM_ON_WIN32
30 #include <windows.h>
31 #else
32 #include <dlfcn.h>
33 #endif
34 
35 using namespace clang;
36 
37 const std::string &CIndexer::getClangResourcesPath() {
38   // Did we already compute the path?
39   if (!ResourcesPath.empty())
40     return ResourcesPath;
41 
42   SmallString<128> LibClangPath;
43 
44   // Find the location where this library lives (libclang.dylib).
45 #ifdef LLVM_ON_WIN32
46   MEMORY_BASIC_INFORMATION mbi;
47   char path[MAX_PATH];
48   VirtualQuery((void *)(uintptr_t)clang_createTranslationUnit, &mbi,
49                sizeof(mbi));
50   GetModuleFileNameA((HINSTANCE)mbi.AllocationBase, path, MAX_PATH);
51 
52 #ifdef __CYGWIN__
53   char w32path[MAX_PATH];
54   strcpy(w32path, path);
55 #if CYGWIN_VERSION_API_MAJOR > 0 || CYGWIN_VERSION_API_MINOR >= 181
56   cygwin_conv_path(CCP_WIN_A_TO_POSIX, w32path, path, MAX_PATH);
57 #else
58   cygwin_conv_to_full_posix_path(w32path, path);
59 #endif
60 #endif
61 
62   LibClangPath += llvm::sys::path::parent_path(path);
63 #else
64   // This silly cast below avoids a C++ warning.
65   Dl_info info;
66   if (dladdr((void *)(uintptr_t)clang_createTranslationUnit, &info) == 0)
67     llvm_unreachable("Call to dladdr() failed");
68 
69   // We now have the CIndex directory, locate clang relative to it.
70   LibClangPath += llvm::sys::path::parent_path(info.dli_fname);
71 #endif
72 
73   llvm::sys::path::append(LibClangPath, "clang", CLANG_VERSION_STRING);
74 
75   // Cache our result.
76   ResourcesPath = LibClangPath.str();
77   return ResourcesPath;
78 }
79