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libclang/CIndexer.cpp: Use loadquery() on AIX for path to library 

Summary:
`dladdr` is not available on AIX. Similar functionality is presented
through `loadquery`. This patch replaces a use of `dladdr` with a
version based on `loadquery`.

Reviewers: sfertile, xingxue, jasonliu

Reviewed By: xingxue

Subscribers: jsji, lhames, majnemer, asb, arphaman, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D59233

llvm-svn: 356843
This commit is contained in:
Hubert Tong 2019-03-23 18:10:45 +00:00
parent d53135767d
commit a7510baf84
1 changed files with 59 additions and 0 deletions
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59
clang/tools/libclang/CIndexer.cpp
View File

@ -32,12 +32,69 @@
#ifdef _WIN32
#include <windows.h>
#elif defined(_AIX)
#include <errno.h>
#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 = llvm::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())
@ -64,6 +121,8 @@ const std::string &CIndexer::getClangResourcesPath() {
#endif
LibClangPath += path;
#elif defined(_AIX)
getClangResourcesPathImplAIX(LibClangPath);
#else
// This silly cast below avoids a C++ warning.
Dl_info info;