//===-- DynamicLibrary.cpp - Runtime link/load libraries --------*- C++ -*-===//
-//
+//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Reid Spencer and is distributed under the
+// 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 "llvm/Config/config.h"
+#include <map>
+
+// Collection of symbol name/value pairs to be searched prior to any libraries.
+static std::map<std::string, void *> g_symbols;
+
+void llvm::sys::DynamicLibrary::AddSymbol(const char* symbolName, void *symbolValue) {
+ g_symbols[symbolName] = symbolValue;
+}
+
+// It is not possible to use ltdl.c on VC++ builds as the terms of its LGPL
+// license and special exception would cause all of LLVM to be placed under
+// the LGPL. This is because the exception applies only when libtool is
+// used, and obviously libtool is not used with Visual Studio. An entirely
+// separate implementation is provided in win32/DynamicLibrary.cpp.
+
+#ifdef LLVM_ON_WIN32
+
+#include "Win32/DynamicLibrary.inc"
+
+#else
+
+#include "ltdl.h"
#include <cassert>
+using namespace llvm;
+using namespace llvm::sys;
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only TRULY operating system
-//=== independent code.
+//=== independent code.
//===----------------------------------------------------------------------===//
-#ifdef HAVE_LTDL_H
-
-namespace llvm {
+static bool did_initialize_ltdl = false;
-using namespace sys;
+static inline void check_ltdl_initialization() {
+ if (!did_initialize_ltdl) {
+ if (0 != lt_dlinit())
+ throw std::string(lt_dlerror());
+ did_initialize_ltdl = true;
+ }
+}
-#ifdef HAVE_LT_DLOPEN
+static std::vector<lt_dlhandle> OpenedHandles;
-DynamicLibrary::DynamicLibrary(const char*filename) : handle(0) {
- if (0 != lt_dlinit())
- throw std::string(lt_dlerror());
+DynamicLibrary::DynamicLibrary() : handle(0) {
+ check_ltdl_initialization();
- handle = lt_dlopen(filename);
+ lt_dlhandle a_handle = lt_dlopen(0);
- if (handle == 0)
- handle = lt_dlopenext(filename);
+ if (a_handle == 0)
+ throw std::string("Can't open program as dynamic library");
- if (handle == 0)
- throw std::string("Can't open dynamic library:") + filename;
+ handle = a_handle;
+ OpenedHandles.push_back(a_handle);
}
-DynamicLibrary::~DynamicLibrary() {
- if (handle)
- lt_dlclose((lt_dlhandle)handle);
+DynamicLibrary::DynamicLibrary(const char*filename) : handle(0) {
+ check_ltdl_initialization();
- lt_dlexit();
-}
+ lt_dlhandle a_handle = lt_dlopen(filename);
-void *DynamicLibrary::GetAddressOfSymbol(const char *symbolName) {
- assert(handle != 0 && "Invalid DynamicLibrary handle");
- return lt_dlsym((lt_dlhandle) handle,symbolName);
-}
+ if (a_handle == 0)
+ a_handle = lt_dlopenext(filename);
-#else
-DynamicLibrary::DynamicLibrary(const char*filename) : handle(0) {
- assert(!"Have ltdl.h but not libltdl.a!");
+ if (a_handle == 0)
+ throw std::string("Can't open :") + filename + ": " + lt_dlerror();
+
+ handle = a_handle;
+ OpenedHandles.push_back(a_handle);
}
DynamicLibrary::~DynamicLibrary() {
- assert(!"Have ltdl.h but not libltdl.a!");
+ lt_dlhandle a_handle = (lt_dlhandle) handle;
+ if (a_handle) {
+ lt_dlclose(a_handle);
+
+ for (std::vector<lt_dlhandle>::iterator I = OpenedHandles.begin(),
+ E = OpenedHandles.end(); I != E; ++I) {
+ if (*I == a_handle) {
+ // Note: don't use the swap/pop_back trick here. Order is important.
+ OpenedHandles.erase(I);
+ }
+ }
+ }
}
-void *DynamicLibrary::GetAddressOfSymbol(const char *symbolName) {
- assert(!"Have ltdl.h but not libltdl.a!");
- return 0;
-}
+void DynamicLibrary::LoadLibraryPermanently(const char* filename) {
+ check_ltdl_initialization();
+ lt_dlhandle a_handle = lt_dlopen(filename);
-#endif // HAVE_DLOPEN
+ if (a_handle == 0)
+ a_handle = lt_dlopenext(filename);
-} // namespace llvm
+ if (a_handle == 0)
+ throw std::string("Can't open :") + filename + ": " + lt_dlerror();
-#else // HAVE_LTDL_H
+ lt_dlmakeresident(a_handle);
-#include "platform/DynamicLibrary.cpp"
+ OpenedHandles.push_back(a_handle);
+}
+void* DynamicLibrary::SearchForAddressOfSymbol(const char* symbolName) {
+ check_ltdl_initialization();
+
+ // First check symbols added via AddSymbol().
+ std::map<std::string, void *>::iterator I = g_symbols.find(symbolName);
+ if (I != g_symbols.end())
+ return I->second;
+
+ // Now search the libraries.
+ for (std::vector<lt_dlhandle>::iterator I = OpenedHandles.begin(),
+ E = OpenedHandles.end(); I != E; ++I) {
+ lt_ptr ptr = lt_dlsym(*I, symbolName);
+ if (ptr)
+ return ptr;
+ }
+
+ // If this is darwin, it has some funky issues, try to solve them here. Some
+ // important symbols are marked 'private external' which doesn't allow
+ // SearchForAddressOfSymbol to find them. As such, we special case them here,
+ // there is only a small handful of them.
+#ifdef __APPLE__
+ {
+#define EXPLICIT_SYMBOL(SYM) \
+ extern void *SYM; if (!strcmp(symbolName, #SYM)) return &SYM
+ EXPLICIT_SYMBOL(__ashldi3);
+ EXPLICIT_SYMBOL(__ashrdi3);
+ EXPLICIT_SYMBOL(__cmpdi2);
+ EXPLICIT_SYMBOL(__divdi3);
+ EXPLICIT_SYMBOL(__eprintf);
+ EXPLICIT_SYMBOL(__fixdfdi);
+ EXPLICIT_SYMBOL(__fixsfdi);
+ EXPLICIT_SYMBOL(__fixunsdfdi);
+ EXPLICIT_SYMBOL(__fixunssfdi);
+ EXPLICIT_SYMBOL(__floatdidf);
+ EXPLICIT_SYMBOL(__floatdisf);
+ EXPLICIT_SYMBOL(__lshrdi3);
+ EXPLICIT_SYMBOL(__moddi3);
+ EXPLICIT_SYMBOL(__udivdi3);
+ EXPLICIT_SYMBOL(__umoddi3);
+#undef EXPLICIT_SYMBOL
+ }
#endif
+
+ return 0;
+}
+
+void *DynamicLibrary::GetAddressOfSymbol(const char *symbolName) {
+ assert(handle != 0 && "Invalid DynamicLibrary handle");
+ return lt_dlsym((lt_dlhandle) handle, symbolName);
+}
+
+#endif // LLVM_ON_WIN32
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