CIndexer.cpp revision 1.1.1.1 
1//===- CIndexer.cpp - Clang-C Source Indexing Library ---------------------===//
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// This file implements the Clang-C Source Indexing library.
10//
11//===----------------------------------------------------------------------===//
12
13#include "CIndexer.h"
14#include "CXString.h"
15#include "clang/Basic/LLVM.h"
16#include "clang/Basic/Version.h"
17#include "clang/Driver/Driver.h"
18#include "llvm/ADT/STLExtras.h"
19#include "llvm/ADT/SmallString.h"
20#include "llvm/Support/MD5.h"
21#include "llvm/Support/Path.h"
22#include "llvm/Support/Program.h"
23#include "llvm/Support/YAMLParser.h"
24#include <cstdio>
25#include <mutex>
26
27#ifdef __CYGWIN__
28#include <cygwin/version.h>
29#include <sys/cygwin.h>
30#define _WIN32 1
31#endif
32
33#ifdef _WIN32
34#include <windows.h>
35#elif defined(_AIX)
36#include <errno.h>
37#include <sys/ldr.h>
38#else
39#include <dlfcn.h>
40#endif
41
42using namespace clang;
43
44#ifdef _AIX
45namespace clang {
46namespace {
47
48template <typename LibClangPathType>
49void getClangResourcesPathImplAIX(LibClangPathType &LibClangPath) {
50  int PrevErrno = errno;
51
52  size_t BufSize = 2048u;
53  std::unique_ptr<char[]> Buf;
54  while (true) {
55    Buf = std::make_unique<char []>(BufSize);
56    errno = 0;
57    int Ret = loadquery(L_GETXINFO, Buf.get(), (unsigned int)BufSize);
58    if (Ret != -1)
59      break; // loadquery() was successful.
60    if (errno != ENOMEM)
61      llvm_unreachable("Encountered an unexpected loadquery() failure");
62
63    // errno == ENOMEM; try to allocate more memory.
64    if ((BufSize & ~((-1u) >> 1u)) != 0u)
65      llvm::report_fatal_error("BufSize needed for loadquery() too large");
66
67    Buf.release();
68    BufSize <<= 1u;
69  }
70
71  // Extract the function entry point from the function descriptor.
72  uint64_t EntryAddr =
73      reinterpret_cast<uintptr_t &>(clang_createTranslationUnit);
74
75  // Loop to locate the function entry point in the loadquery() results.
76  ld_xinfo *CurInfo = reinterpret_cast<ld_xinfo *>(Buf.get());
77  while (true) {
78    uint64_t CurTextStart = (uint64_t)CurInfo->ldinfo_textorg;
79    uint64_t CurTextEnd = CurTextStart + CurInfo->ldinfo_textsize;
80    if (CurTextStart <= EntryAddr && EntryAddr < CurTextEnd)
81      break; // Successfully located.
82
83    if (CurInfo->ldinfo_next == 0u)
84      llvm::report_fatal_error("Cannot locate entry point in "
85                               "the loadquery() results");
86    CurInfo = reinterpret_cast<ld_xinfo *>(reinterpret_cast<char *>(CurInfo) +
87                                           CurInfo->ldinfo_next);
88  }
89
90  LibClangPath += reinterpret_cast<char *>(CurInfo) + CurInfo->ldinfo_filename;
91  errno = PrevErrno;
92}
93
94} // end anonymous namespace
95} // end namespace clang
96#endif
97
98const std::string &CIndexer::getClangResourcesPath() {
99  // Did we already compute the path?
100  if (!ResourcesPath.empty())
101    return ResourcesPath;
102
103  SmallString<128> LibClangPath;
104
105  // Find the location where this library lives (libclang.dylib).
106#ifdef _WIN32
107  MEMORY_BASIC_INFORMATION mbi;
108  char path[MAX_PATH];
109  VirtualQuery((void *)(uintptr_t)clang_createTranslationUnit, &mbi,
110               sizeof(mbi));
111  GetModuleFileNameA((HINSTANCE)mbi.AllocationBase, path, MAX_PATH);
112
113#ifdef __CYGWIN__
114  char w32path[MAX_PATH];
115  strcpy(w32path, path);
116#if CYGWIN_VERSION_API_MAJOR > 0 || CYGWIN_VERSION_API_MINOR >= 181
117  cygwin_conv_path(CCP_WIN_A_TO_POSIX, w32path, path, MAX_PATH);
118#else
119  cygwin_conv_to_full_posix_path(w32path, path);
120#endif
121#endif
122
123  LibClangPath += path;
124#elif defined(_AIX)
125  getClangResourcesPathImplAIX(LibClangPath);
126#else
127  // This silly cast below avoids a C++ warning.
128  Dl_info info;
129  if (dladdr((void *)(uintptr_t)clang_createTranslationUnit, &info) == 0)
130    llvm_unreachable("Call to dladdr() failed");
131
132  // We now have the CIndex directory, locate clang relative to it.
133  LibClangPath += info.dli_fname;
134#endif
135
136  // Cache our result.
137  ResourcesPath = driver::Driver::GetResourcesPath(LibClangPath);
138  return ResourcesPath;
139}
140
141StringRef CIndexer::getClangToolchainPath() {
142  if (!ToolchainPath.empty())
143    return ToolchainPath;
144  StringRef ResourcePath = getClangResourcesPath();
145  ToolchainPath = llvm::sys::path::parent_path(
146      llvm::sys::path::parent_path(llvm::sys::path::parent_path(ResourcePath)));
147  return ToolchainPath;
148}
149
150LibclangInvocationReporter::LibclangInvocationReporter(
151    CIndexer &Idx, OperationKind Op, unsigned ParseOptions,
152    llvm::ArrayRef<const char *> Args,
153    llvm::ArrayRef<std::string> InvocationArgs,
154    llvm::ArrayRef<CXUnsavedFile> UnsavedFiles) {
155  StringRef Path = Idx.getInvocationEmissionPath();
156  if (Path.empty())
157    return;
158
159  // Create a temporary file for the invocation log.
160  SmallString<256> TempPath;
161  TempPath = Path;
162  llvm::sys::path::append(TempPath, "libclang-%%%%%%%%%%%%");
163  int FD;
164  if (llvm::sys::fs::createUniqueFile(TempPath, FD, TempPath))
165    return;
166  File = std::string(TempPath.begin(), TempPath.end());
167  llvm::raw_fd_ostream OS(FD, /*ShouldClose=*/true);
168
169  // Write out the information about the invocation to it.
170  auto WriteStringKey = [&OS](StringRef Key, StringRef Value) {
171    OS << R"(")" << Key << R"(":")";
172    OS << llvm::yaml::escape(Value) << '"';
173  };
174  OS << '{';
175  WriteStringKey("toolchain", Idx.getClangToolchainPath());
176  OS << ',';
177  WriteStringKey("libclang.operation",
178                 Op == OperationKind::ParseOperation ? "parse" : "complete");
179  OS << ',';
180  OS << R"("libclang.opts":)" << ParseOptions;
181  OS << ',';
182  OS << R"("args":[)";
183  for (const auto &I : llvm::enumerate(Args)) {
184    if (I.index())
185      OS << ',';
186    OS << '"' << llvm::yaml::escape(I.value()) << '"';
187  }
188  if (!InvocationArgs.empty()) {
189    OS << R"(],"invocation-args":[)";
190    for (const auto &I : llvm::enumerate(InvocationArgs)) {
191      if (I.index())
192        OS << ',';
193      OS << '"' << llvm::yaml::escape(I.value()) << '"';
194    }
195  }
196  if (!UnsavedFiles.empty()) {
197    OS << R"(],"unsaved_file_hashes":[)";
198    for (const auto &UF : llvm::enumerate(UnsavedFiles)) {
199      if (UF.index())
200        OS << ',';
201      OS << '{';
202      WriteStringKey("name", UF.value().Filename);
203      OS << ',';
204      llvm::MD5 Hash;
205      Hash.update(getContents(UF.value()));
206      llvm::MD5::MD5Result Result;
207      Hash.final(Result);
208      SmallString<32> Digest = Result.digest();
209      WriteStringKey("md5", Digest);
210      OS << '}';
211    }
212  }
213  OS << "]}";
214}
215
216LibclangInvocationReporter::~LibclangInvocationReporter() {
217  if (!File.empty())
218    llvm::sys::fs::remove(File);
219}
220