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//===- 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/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 1
#endif
#ifdef _WIN32
#include <windows.h>
#elif defined(_AIX)
#include <errno.h>
#error #include <sys/ldr.h>
#else
#include <dlfcn.h>
#endif
using namespace clang;
#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() {
// Did we already compute the path?
if (!ResourcesPath.empty())
return ResourcesPath;
SmallString<128> LibClangPath;
// Find the location where this library lives (libclang.dylib).
#ifdef _WIN32
MEMORY_BASIC_INFORMATION mbi;
char path[MAX_PATH];
VirtualQuery((void *)(uintptr_t)clang_createTranslationUnit, &mbi,
sizeof(mbi));
GetModuleFileNameA((HINSTANCE)mbi.AllocationBase, path, MAX_PATH);
#ifdef __CYGWIN__
char w32path[MAX_PATH];
strcpy(w32path, path);
#if CYGWIN_VERSION_API_MAJOR > 0 || CYGWIN_VERSION_API_MINOR >= 181
cygwin_conv_path(CCP_WIN_A_TO_POSIX, w32path, path, MAX_PATH);
#else
cygwin_conv_to_full_posix_path(w32path, path);
#endif
#endif
LibClangPath += path;
#elif defined(_AIX)
getClangResourcesPathImplAIX(LibClangPath);
#else
Dl_info info;
std::string Path;
// This silly cast below avoids a C++ warning.
if (dladdr((void *)(uintptr_t)clang_createTranslationUnit, &info) != 0) {
// We now have the CIndex directory, locate clang relative to it.
LibClangPath += info.dli_fname;
} else if (!(Path = llvm::sys::fs::getMainExecutable(nullptr, nullptr)).empty()) {
// If we can't get the path using dladdr, try to get the main executable
// path. This may be needed when we're statically linking libclang with
// musl libc, for example.
LibClangPath += Path;
} else {
// It's rather unlikely we end up here. But it could happen, so report an
// error instead of crashing.
llvm::report_fatal_error("could not locate Clang resource path");
}
#endif
// Cache our result.
ResourcesPath = driver::Driver::GetResourcesPath(LibClangPath);
return ResourcesPath;
}
StringRef CIndexer::getClangToolchainPath() {
if (!ToolchainPath.empty())
return ToolchainPath;
StringRef ResourcePath = getClangResourcesPath();
ToolchainPath =
std::string(llvm::sys::path::parent_path(llvm::sys::path::parent_path(
llvm::sys::path::parent_path(ResourcePath))));
return ToolchainPath;
}
LibclangInvocationReporter::LibclangInvocationReporter(
CIndexer &Idx, OperationKind Op, unsigned ParseOptions,
llvm::ArrayRef<const char *> Args,
llvm::ArrayRef<std::string> InvocationArgs,
llvm::ArrayRef<CXUnsavedFile> UnsavedFiles) {
StringRef Path = Idx.getInvocationEmissionPath();
if (Path.empty())
return;
// Create a temporary file for the invocation log.
SmallString<256> TempPath;
TempPath = Path;
llvm::sys::path::append(TempPath, "libclang-%%%%%%%%%%%%");
int FD;
if (llvm::sys::fs::createUniqueFile(TempPath, FD, TempPath,
llvm::sys::fs::OF_Text))
return;
File = static_cast<std::string>(TempPath);
llvm::raw_fd_ostream OS(FD, /*ShouldClose=*/true);
// Write out the information about the invocation to it.
auto WriteStringKey = [&OS](StringRef Key, StringRef Value) {
OS << R"(")" << Key << R"(":")";
OS << llvm::yaml::escape(Value) << '"';
};
OS << '{';
WriteStringKey("toolchain", Idx.getClangToolchainPath());
OS << ',';
WriteStringKey("libclang.operation",
Op == OperationKind::ParseOperation ? "parse" : "complete");
OS << ',';
OS << R"("libclang.opts":)" << ParseOptions;
OS << ',';
OS << R"("args":[)";
for (const auto &I : llvm::enumerate(Args)) {
if (I.index())
OS << ',';
OS << '"' << llvm::yaml::escape(I.value()) << '"';
}
if (!InvocationArgs.empty()) {
OS << R"(],"invocation-args":[)";
for (const auto &I : llvm::enumerate(InvocationArgs)) {
if (I.index())
OS << ',';
OS << '"' << llvm::yaml::escape(I.value()) << '"';
}
}
if (!UnsavedFiles.empty()) {
OS << R"(],"unsaved_file_hashes":[)";
for (const auto &UF : llvm::enumerate(UnsavedFiles)) {
if (UF.index())
OS << ',';
OS << '{';
WriteStringKey("name", UF.value().Filename);
OS << ',';
llvm::MD5 Hash;
Hash.update(getContents(UF.value()));
llvm::MD5::MD5Result Result;
Hash.final(Result);
SmallString<32> Digest = Result.digest();
WriteStringKey("md5", Digest);
OS << '}';
}
}
OS << "]}";
}
LibclangInvocationReporter::~LibclangInvocationReporter() {
if (!File.empty())
llvm::sys::fs::remove(File);
}
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