1 files changed, 41 insertions, 16 deletions

diff --git a/lib/Support/DynamicLinker.cpp b/lib/Support/DynamicLinker.cpp
index cf00bea2db..4ac58c1bbc 100644
--- a/lib/Support/DynamicLinker.cpp
+++ b/lib/Support/DynamicLinker.cpp
@@ -12,8 +12,7 @@
 // provides it.
 //
 // Possible future extensions include support for the HPUX shl_load()
-// interface, the Mac OS X NSLinkModule() interface, and the Windows
-// LoadLibrary() interface.
+// interface, and the Mac OS X NSLinkModule() interface.
 //
 // Note that we assume that if dlopen() is available, then dlsym() is too.
 //
@@ -23,18 +22,36 @@
 #include "Config/dlfcn.h"
 #include "Config/windows.h"
 #include <cassert>
+#include <vector>
 using namespace llvm;
 
-bool llvm::LinkDynamicObject (const char *filename, std::string *ErrorMessage) {
-#if defined (HAVE_DLOPEN)
-  if (dlopen (filename, RTLD_NOW | RTLD_GLOBAL) == 0) {
-    if (ErrorMessage) *ErrorMessage = dlerror ();
-    return true;
+#if defined(HAVE_WINDOWS_H)
+// getLoadedLibs - Keep track of the shared objects that are loaded into the
+// process address space, as the windows GetProcAddress function does not
+// automatically search an entire address space, it only searches a specific
+// object.
+static std::vector<HMODULE> &getLoadedLibHandles() {
+  static std::vector<HMODULE> *LoadedLibHandles = 0;
+  if (LoadedLibHandles == 0) {
+    LoadedLibHandles = new std::vector<HMODULE>();
+    if (HMODULE H = GetModuleHandle(NULL))                // JIT symbols
+      LoadedLibHandles->push_back(H);
+    if (HMODULE MH = GetModuleHandle("cygwin1.dll"))      // Cygwin symbols OR
+      LoadedLibHandles->push_back(MH);
+    else if (HMODULE MH = GetModuleHandle("msvcr80.dll")) // VC++ symbols
+      LoadedLibHandles->push_back(MH);
   }
-  return false;
-#elif defined(HAVE_WINDOWS_H)
-  if (LoadLibrary(filename))
+  return *LoadedLibHandles;
+}
+#endif
+
+bool llvm::LinkDynamicObject(const char *filename, std::string *ErrorMessage) {
+#if defined(HAVE_WINDOWS_H)
+  if (HMODULE Handle = LoadLibrary(filename)) {
+    // Allow GetProcAddress in this module
+    getLoadedLibHandles().push_back(Handle);
     return false;
+  }
   if (ErrorMessage) {
     char Buffer[100];
     // FIXME: This should use FormatMessage
@@ -42,23 +59,31 @@ bool llvm::LinkDynamicObject (const char *filename, std::string *ErrorMessage) {
     *ErrorMessage = Buffer;
   }
   return true;
+#elif defined (HAVE_DLOPEN)
+  if (dlopen (filename, RTLD_NOW | RTLD_GLOBAL) == 0) {
+    if (ErrorMessage) *ErrorMessage = dlerror ();
+    return true;
+  }
+  return false;
 #else
   assert (0 && "Dynamic object linking not implemented for this platform");
 #endif
 }
 
-void *llvm::GetAddressOfSymbol (const char *symbolName) {
-#if defined (HAVE_DLOPEN)
+void *llvm::GetAddressOfSymbol(const char *symbolName) {
+#if defined(HAVE_WINDOWS_H)
+  std::vector<HMODULE> &LH = getLoadedLibHandles();
+  for (unsigned i = 0, e = LH.size(); i != e; ++i)
+    if (void *Val = (void*)GetProcAddress(LH[i], symbolName))
+      return Val;
+  return 0;
+#elif defined(HAVE_DLOPEN)
 #  ifdef RTLD_DEFAULT
     return dlsym (RTLD_DEFAULT, symbolName);
 #  else
     static void* CurHandle = dlopen(0, RTLD_LAZY);
     return dlsym(CurHandle, symbolName);
 #  endif
-#elif defined(HAVE_WINDOWS_H)
-  static HMODULE ModHandle = NULL;
-  if (ModHandle == 0) ModHandle = GetModuleHandle(NULL);
-  return (void*)GetProcAddress(ModHandle, symbolName);
 #else
   assert (0 && "Dynamic symbol lookup not implemented for this platform");
 #endif