llvm/clang/tools/libclang/CIndexer.cpp

//===- CIndexer.cpp - Clang-C Source Indexing Library ---------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the Clang-C Source Indexing library.
//
//===----------------------------------------------------------------------===//

#include "CIndexer.h"
#include "CXString.h"
#include "clang/Basic/LLVM.h"
#include "clang/Basic/Version.h"
#include "clang/Config/config.h"
#include "clang/Driver/Driver.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MD5.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/YAMLParser.h"
#include <cstdio>
#include <mutex>

#ifdef __CYGWIN__
#include <cygwin/version.h>
#include <sys/cygwin.h>
#define _WIN32 …
#endif

#ifdef _WIN32
#include <windows.h>
#elif defined(_AIX)
#include <errno.h>
#include <sys/ldr.h>
#else
#include <dlfcn.h>
#endif

usingnamespaceclang;

#ifdef _AIX
namespace clang {
namespace {

template <typename LibClangPathType>
void getClangResourcesPathImplAIX(LibClangPathType &LibClangPath) {
  int PrevErrno = errno;

  size_t BufSize = 2048u;
  std::unique_ptr<char[]> Buf;
  while (true) {
    Buf = std::make_unique<char []>(BufSize);
    errno = 0;
    int Ret = loadquery(L_GETXINFO, Buf.get(), (unsigned int)BufSize);
    if (Ret != -1)
      break; // loadquery() was successful.
    if (errno != ENOMEM)
      llvm_unreachable("Encountered an unexpected loadquery() failure");

    // errno == ENOMEM; try to allocate more memory.
    if ((BufSize & ~((-1u) >> 1u)) != 0u)
      llvm::report_fatal_error("BufSize needed for loadquery() too large");

    Buf.release();
    BufSize <<= 1u;
  }

  // Extract the function entry point from the function descriptor.
  uint64_t EntryAddr =
      reinterpret_cast<uintptr_t &>(clang_createTranslationUnit);

  // Loop to locate the function entry point in the loadquery() results.
  ld_xinfo *CurInfo = reinterpret_cast<ld_xinfo *>(Buf.get());
  while (true) {
    uint64_t CurTextStart = (uint64_t)CurInfo->ldinfo_textorg;
    uint64_t CurTextEnd = CurTextStart + CurInfo->ldinfo_textsize;
    if (CurTextStart <= EntryAddr && EntryAddr < CurTextEnd)
      break; // Successfully located.

    if (CurInfo->ldinfo_next == 0u)
      llvm::report_fatal_error("Cannot locate entry point in "
                               "the loadquery() results");
    CurInfo = reinterpret_cast<ld_xinfo *>(reinterpret_cast<char *>(CurInfo) +
                                           CurInfo->ldinfo_next);
  }

  LibClangPath += reinterpret_cast<char *>(CurInfo) + CurInfo->ldinfo_filename;
  errno = PrevErrno;
}

} // end anonymous namespace
} // end namespace clang
#endif

const std::string &CIndexer::getClangResourcesPath() { … }

StringRef CIndexer::getClangToolchainPath() { … }

LibclangInvocationReporter::LibclangInvocationReporter(
    CIndexer &Idx, OperationKind Op, unsigned ParseOptions,
    llvm::ArrayRef<const char *> Args,
    llvm::ArrayRef<std::string> InvocationArgs,
    llvm::ArrayRef<CXUnsavedFile> UnsavedFiles) { … }

LibclangInvocationReporter::~LibclangInvocationReporter() { … }