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
diff --git a/lib/System/DynamicLibrary.cpp b/lib/System/DynamicLibrary.cpp
new file mode 100644
index 0000000..ca7bee6
--- /dev/null
+++ b/lib/System/DynamicLibrary.cpp
@@ -0,0 +1,78 @@
+//===-- DynamicLibrary.cpp - Runtime link/load libraries --------*- 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 header file implements the operating system DynamicLibrary concept.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/System/DynamicLibrary.h"
+#include "llvm/Config/dlfcn.h"
+#include <cassert>
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only TRULY operating system
+//=== independent code.
+//===----------------------------------------------------------------------===//
+
+#ifdef HAVE_LTDL_H
+
+namespace llvm {
+
+using namespace sys;
+
+#ifdef HAVE_LT_DLOPEN
+
+DynamicLibrary::DynamicLibrary(const char*filename) : handle(0) {
+ if (0 != lt_dlinit())
+ throw std::string(lt_dlerror());
+
+ handle = lt_dlopen(filename);
+
+ if (handle == 0)
+ handle = lt_dlopenext(filename);
+
+ if (handle == 0)
+ throw std::string("Can't open dynamic library:") + filename;
+}
+
+DynamicLibrary::~DynamicLibrary() {
+ if (handle)
+ lt_dlclose((lt_dlhandle)handle);
+
+ lt_dlexit();
+}
+
+void *DynamicLibrary::GetAddressOfSymbol(const char *symbolName) {
+ assert(handle != 0 && "Invalid DynamicLibrary handle");
+ return lt_dlsym((lt_dlhandle) handle,symbolName);
+}
+
+#else
+DynamicLibrary::DynamicLibrary(const char*filename) : handle(0) {
+ assert(!"Have ltdl.h but not libltdl.a!");
+}
+
+DynamicLibrary::~DynamicLibrary() {
+ assert(!"Have ltdl.h but not libltdl.a!");
+}
+
+void *DynamicLibrary::GetAddressOfSymbol(const char *symbolName) {
+ assert(!"Have ltdl.h but not libltdl.a!");
+ return 0;
+}
+
+#endif // HAVE_DLOPEN
+
+} // namespace llvm
+
+#else // HAVE_LTDL_H
+
+#include "platform/DynamicLibrary.cpp"
+
+#endif