Revert r296442 (and r296443), "Allow externally dlopen-ed libraries to be registered as permanent libraries."

It broke clang/test/Analysis/checker-plugins.c

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296463 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/DynamicLibrary.h

@@ -14,8 +14,6 @@
 #ifndef LLVM_SUPPORT_DYNAMICLIBRARY_H
 #define LLVM_SUPPORT_DYNAMICLIBRARY_H
 
-#include "llvm/Support/Mutex.h"
-
 #include <string>
 
 namespace llvm {
@@ -45,11 +43,6 @@ namespace sys {
     // Opaque data used to interface with OS-specific dynamic library handling.
     void *Data;
 
-    // Adds a opened library handle to the list of OpenedHandles.
-    static DynamicLibrary addPermanentLibraryWithLock(void *handle,
-                                                   sys::SmartScopedLock<true> &,
-                                                      bool isMainExec);
-
   public:
     explicit DynamicLibrary(void *data = &Invalid) : Data(data) {}
 
@@ -75,14 +68,6 @@ namespace sys {
     static DynamicLibrary getPermanentLibrary(const char *filename,
                                               std::string *errMsg = nullptr);
 
-    /// Registers an externally loaded library. The library will be unloaded
-    /// when the program terminates.
-    ///
-    /// It is safe to call this function multiple times for the same library.
-    ///
-    /// \returns An empty \p DynamicLibrary on failure.
-    static DynamicLibrary addPermanentLibrary(void *handle);
-
     /// This function permanently loads the dynamic library at the given path.
     /// Use this instead of getPermanentLibrary() when you won't need to get
     /// symbols from the library itself.

lib/Support/DynamicLibrary.cpp

@@ -68,34 +68,10 @@ DynamicLibrary DynamicLibrary::getPermanentLibrary(const char *filename,
     handle = RTLD_DEFAULT;
 #endif
 
-  DynamicLibrary dyLib = addPermanentLibraryWithLock(handle, lock, !filename);
-
   // If we've already loaded this library, dlclose() the handle in order to
   // keep the internal refcount at +1.
-  if (!dyLib.isValid()) {
-    if (errMsg)
-      *errMsg = (filename) ? std::string(filename) : std::string() +
-        ": Library already loaded";
+  if (!OpenedHandles->insert(handle).second)
     dlclose(handle);
-  }
-
-  return dyLib;
-}
-
-DynamicLibrary DynamicLibrary::addPermanentLibrary(void *handle) {
-  SmartScopedLock<true> lock(*SymbolsMutex);
-  return addPermanentLibraryWithLock(handle, lock, false);
-}
-
-DynamicLibrary DynamicLibrary::addPermanentLibraryWithLock(void *handle,
-                                                   sys::SmartScopedLock<true> &,
-                                                           bool isMainExec) {
-  // If we've already loaded this library, tell the caller.
-  // FIXME: Note that multiple requests for adding the main executable is not
-  // considered as an error. If we don't want to treat the main executable as a
-  // special case we need to do a cleanup in the MCJIT tests and API.
-  if (!OpenedHandles->insert(handle).second && !isMainExec)
-    return DynamicLibrary();
 
   return DynamicLibrary(handle);
 }

lib/Support/Windows/DynamicLibrary.inc

@@ -9,6 +9,8 @@
 //
 // This file provides the Win32 specific implementation of DynamicLibrary.
 //
+// FIXME: This file leaks OpenedHandles!
+//
 //===----------------------------------------------------------------------===//
 
 #include "WindowsSupport.h"
@@ -33,7 +35,7 @@ using namespace sys;
 
 typedef BOOL (WINAPI *fpEnumerateLoadedModules)(HANDLE,PENUMLOADED_MODULES_CALLBACK64,PVOID);
 static fpEnumerateLoadedModules fEnumerateLoadedModules;
-static llvm::ManagedStatic<DenseSet<HMODULE> > OpenedHandles;
+static DenseSet<HMODULE> *OpenedHandles;
 
 static bool loadDebugHelp(void) {
   HMODULE hLib = ::LoadLibraryW(L"Dbghelp.dll");
@@ -57,6 +59,9 @@ DynamicLibrary DynamicLibrary::getPermanentLibrary(const char *filename,
 
   if (!filename) {
     // When no file is specified, enumerate all DLLs and EXEs in the process.
+    if (OpenedHandles == 0)
+      OpenedHandles = new DenseSet<HMODULE>();
+
     if (!fEnumerateLoadedModules) {
       if (!loadDebugHelp()) {
         assert(false && "These APIs should always be available");
@@ -76,7 +81,7 @@ DynamicLibrary DynamicLibrary::getPermanentLibrary(const char *filename,
     MakeErrMsg(errMsg, std::string(filename) + ": Can't convert to UTF-16");
     return DynamicLibrary();
   }
-
+  
   HMODULE a_handle = LoadLibraryW(filenameUnicode.data());
 
   if (a_handle == 0) {
@@ -84,33 +89,15 @@ DynamicLibrary DynamicLibrary::getPermanentLibrary(const char *filename,
     return DynamicLibrary();
   }
 
-  DynamicLibrary dyLib = addPermanentLibraryWithLock(a_handle, lock, !filename);
+  if (OpenedHandles == 0)
+    OpenedHandles = new DenseSet<HMODULE>();
+
   // If we've already loaded this library, FreeLibrary() the handle in order to
   // keep the internal refcount at +1.
-  if (!dyLib.isValid()) {
-    MakeErrMsg(errMsg, std::string(filename) + ": Already loaded");
+  if (!OpenedHandles->insert(a_handle).second)
     FreeLibrary(a_handle);
-  }
-
-  return dyLib;
-}
-
-DynamicLibrary DynamicLibrary::addPermanentLibrary(void *handle) {
-  SmartScopedLock<true> lock(*SymbolsMutex);
-  return addPermanentLibraryWithLock(handle, lock, false);
-}
-
-DynamicLibrary DynamicLibrary::addPermanentLibraryWithLock(void *handle,
-                                                   sys::SmartScopedLock<true> &,
-                                                           bool isMainExec) {
-  // If we've already loaded this library, tell the caller.
-  // FIXME: Note that multiple requests for adding the main executable is not
-  // considered as an error. If we don't want to treat the main executable as a
-  // special case we need to do a cleanup in the MCJIT tests and API.
-  if (!OpenedHandles->insert((const HMODULE)handle).second && !isMainExec)
-    return DynamicLibrary();
 
-  return DynamicLibrary((HMODULE)handle);
+  return DynamicLibrary(a_handle);
 }
 
 // Stack probing routines are in the support library (e.g. libgcc), but we don't
@@ -150,7 +137,7 @@ void* DynamicLibrary::SearchForAddressOfSymbol(const char* symbolName) {
   }
 
   // Now search the libraries.
-  if (OpenedHandles.isConstructed()) {
+  if (OpenedHandles) {
     for (DenseSet<HMODULE>::iterator I = OpenedHandles->begin(),
          E = OpenedHandles->end(); I != E; ++I) {
       FARPROC ptr = GetProcAddress((HMODULE)*I, symbolName);