Dynamic Library abstraction. This makes the abstraction of a single dynamic

library (shared library/shared object) whose symbols can be looked up
dynamically. Used for plug-ins.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17940 91177308-0d34-0410-b5e6-96231b3b80d8

lib/System/Unix/DynamicLibrary.cpp

@@ -0,0 +1,47 @@
+//===- Unix/DynamicLibrary.cpp - Generic UNIX Dynamic Library ---*- C++ -*-===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the 
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// This file implements the generic UNIX variant of DynamicLibrary
+//
+//===----------------------------------------------------------------------===//
+
+#include "Unix.h"
+
+namespace llvm {
+using namespace sys;
+
+
+DynamicLibrary::DynamicLibrary(const char *filename) {
+#if defined (HAVE_DLOPEN)
+  if ((handle = dlopen (filename, RTLD_NOW | RTLD_GLOBAL)) == 0)
+    throw std::string( dlerror() );
+#else
+  assert (!"Dynamic object linking not implemented for this platform");
+#endif
+}
+
+DynamicLibrary::~DynamicLibrary() {
+  assert(handle != 0 && "Invalid DynamicLibrary handle");
+#if defined (HAVE_DLOPEN)
+  dlclose(handle);
+#else
+  assert (!"Dynamic object linking not implemented for this platform");
+#endif
+}
+
+void *DynamicLibrary::GetAddressOfSymbol(const char *symbolName) {
+  assert(handle != 0 && "Invalid DynamicLibrary handle");
+#if defined(HAVE_DLOPEN)
+    return dlsym (handle, symbolName);
+#else
+  assert (0 && "Dynamic symbol lookup not implemented for this platform");
+#endif
+}
+
+}