//===-- 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/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
// used, and obviously libtool is not used with Visual Studio. An entirely
// separate implementation is provided in win32/DynamicLibrary.cpp.
-#ifdef _WIN32
+#ifdef LLVM_ON_WIN32
-#include "win32/DynamicLibrary.cpp"
+#include "Win32/DynamicLibrary.inc"
#else
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only TRULY operating system
-//=== independent code.
+//=== independent code.
//===----------------------------------------------------------------------===//
-static bool did_initialize_ltdl = false;
-
static inline void check_ltdl_initialization() {
+ static bool did_initialize_ltdl = false;
if (!did_initialize_ltdl) {
- if (0 != lt_dlinit())
- throw std::string(lt_dlerror());
+ int Err = lt_dlinit();
+ Err = Err; // Silence warning.
+ assert(0 == Err && "Can't init the ltdl library");
did_initialize_ltdl = true;
}
}
lt_dlhandle a_handle = lt_dlopen(0);
- if (a_handle == 0)
- throw std::string("Can't open program as dynamic library");
-
+ assert(a_handle == 0 && "Can't open program as dynamic library");
+
handle = a_handle;
OpenedHandles.push_back(a_handle);
}
+/*
DynamicLibrary::DynamicLibrary(const char*filename) : handle(0) {
check_ltdl_initialization();
handle = a_handle;
OpenedHandles.push_back(a_handle);
}
+*/
DynamicLibrary::~DynamicLibrary() {
lt_dlhandle a_handle = (lt_dlhandle) handle;
if (*I == a_handle) {
// Note: don't use the swap/pop_back trick here. Order is important.
OpenedHandles.erase(I);
+ return;
}
}
}
}
-void DynamicLibrary::LoadLibraryPermanently(const char* filename) {
+bool DynamicLibrary::LoadLibraryPermanently(const char *Filename,
+ std::string *ErrMsg) {
check_ltdl_initialization();
- lt_dlhandle a_handle = lt_dlopen(filename);
+ lt_dlhandle a_handle = lt_dlopen(Filename);
if (a_handle == 0)
- a_handle = lt_dlopenext(filename);
+ a_handle = lt_dlopenext(Filename);
- if (a_handle == 0)
- throw std::string("Can't open :") + filename + ": " + lt_dlerror();
+ if (a_handle == 0) {
+ if (ErrMsg)
+ *ErrMsg = std::string("Can't open :") +
+ (Filename ? Filename : "<current process>") + ": " + lt_dlerror();
+ return true;
+ }
lt_dlmakeresident(a_handle);
OpenedHandles.push_back(a_handle);
+ return false;
}
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);
// 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(__moddi3);
EXPLICIT_SYMBOL(__udivdi3);
EXPLICIT_SYMBOL(__umoddi3);
+ }
#undef EXPLICIT_SYMBOL
+#endif
+
+// This macro returns the address of a well-known, explicit symbol
+#define EXPLICIT_SYMBOL(SYM) \
+ if (!strcmp(symbolName, #SYM)) return &SYM
+
+// On linux we have a weird situation. The stderr/out/in symbols are both
+// macros and global variables because of standards requirements. So, we
+// boldly use the EXPLICIT_SYMBOL macro without checking for a #define first.
+#if defined(__linux__)
+ {
+ EXPLICIT_SYMBOL(stderr);
+ EXPLICIT_SYMBOL(stdout);
+ EXPLICIT_SYMBOL(stdin);
}
+#else
+ // For everything else, we want to check to make sure the symbol isn't defined
+ // as a macro before using EXPLICIT_SYMBOL.
+ {
+#ifndef stdin
+ EXPLICIT_SYMBOL(stdin);
+#endif
+#ifndef stdout
+ EXPLICIT_SYMBOL(stdout);
+#endif
+#ifndef stderr
+ EXPLICIT_SYMBOL(stderr);
#endif
+ }
+#endif
+#undef EXPLICIT_SYMBOL
return 0;
}
return lt_dlsym((lt_dlhandle) handle, symbolName);
}
-#endif // _WIN32
\ No newline at end of file
+#endif // LLVM_ON_WIN32
+
+DEFINING_FILE_FOR(SystemDynamicLibrary)
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