[llvm-commits] CVS: llvm/lib/System/DynamicLibrary.cpp

[Reid Spencer]

Changes in directory llvm/lib/System:

DynamicLibrary.cpp added (r1.1)
---
Log message:

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.


---
Diffs of the changes:  (+78 -0)

Index: llvm/lib/System/DynamicLibrary.cpp
diff -c /dev/null llvm/lib/System/DynamicLibrary.cpp:1.1
*** /dev/null	Wed Nov 17 22:33:50 2004
--- llvm/lib/System/DynamicLibrary.cpp	Wed Nov 17 22:33:40 2004
***************
*** 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