//
// 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 is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This header file implements the operating system DynamicLibrary concept.
//
+// FIXME: This file leaks the ExplicitSymbols and OpenedHandles vector, and is
+// not thread safe!
+//
//===----------------------------------------------------------------------===//
#include "llvm/System/DynamicLibrary.h"
#include "llvm/Config/config.h"
+#include <cstdio>
+#include <cstring>
#include <map>
+#include <vector>
// Collection of symbol name/value pairs to be searched prior to any libraries.
-static std::map<std::string, void *> g_symbols;
+static std::map<std::string, void*> *ExplicitSymbols = 0;
+
+static struct ExplicitSymbolsDeleter {
+ ~ExplicitSymbolsDeleter() {
+ if (ExplicitSymbols)
+ delete ExplicitSymbols;
+ }
+} Dummy;
void llvm::sys::DynamicLibrary::AddSymbol(const char* symbolName,
void *symbolValue) {
- g_symbols[symbolName] = symbolValue;
+ if (ExplicitSymbols == 0)
+ ExplicitSymbols = new std::map<std::string, void*>();
+ (*ExplicitSymbols)[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>
+#include <dlfcn.h>
using namespace llvm;
using namespace llvm::sys;
//=== independent code.
//===----------------------------------------------------------------------===//
-static inline void check_ltdl_initialization() {
- static bool did_initialize_ltdl = false;
- if (!did_initialize_ltdl) {
- int Err = lt_dlinit();
- assert(0 == Err && "Can't init the ltdl library");
- did_initialize_ltdl = true;
- }
-}
-
-static std::vector<lt_dlhandle> OpenedHandles;
-
-DynamicLibrary::DynamicLibrary() : handle(0) {
- check_ltdl_initialization();
-
- lt_dlhandle a_handle = lt_dlopen(0);
-
- 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();
-
- lt_dlhandle a_handle = lt_dlopen(filename);
-
- if (a_handle == 0)
- a_handle = lt_dlopenext(filename);
+static std::vector<void *> *OpenedHandles = 0;
- if (a_handle == 0)
- throw std::string("Can't open :") + filename + ": " + lt_dlerror();
-
- handle = a_handle;
- OpenedHandles.push_back(a_handle);
-}
-*/
-
-DynamicLibrary::~DynamicLibrary() {
- 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);
- return;
- }
- }
- }
-}
bool DynamicLibrary::LoadLibraryPermanently(const char *Filename,
std::string *ErrMsg) {
- check_ltdl_initialization();
- lt_dlhandle a_handle = lt_dlopen(Filename);
-
- if (a_handle == 0)
- a_handle = lt_dlopenext(Filename);
-
- if (a_handle == 0) {
- if (ErrMsg)
- *ErrMsg = std::string("Can't open :") +
- (Filename ? Filename : "<current process>") + ": " + lt_dlerror();
+ void *H = dlopen(Filename, RTLD_LAZY|RTLD_GLOBAL);
+ if (H == 0) {
+ if (ErrMsg) *ErrMsg = dlerror();
return true;
}
-
- lt_dlmakeresident(a_handle);
-
- OpenedHandles.push_back(a_handle);
+ if (OpenedHandles == 0)
+ OpenedHandles = new std::vector<void *>();
+ OpenedHandles->push_back(H);
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);
- if (ptr)
- return ptr;
- }
+static void *SearchForAddressOfSpecialSymbol(const char* symbolName) {
+#define EXPLICIT_SYMBOL(SYM) \
+ extern void *SYM; if (!strcmp(symbolName, #SYM)) return &SYM
// 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
// 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(__udivdi3);
EXPLICIT_SYMBOL(__umoddi3);
}
-#undef EXPLICIT_SYMBOL
#endif
+#ifdef __CYGWIN__
+ {
+ EXPLICIT_SYMBOL(_alloca);
+ EXPLICIT_SYMBOL(__main);
+ }
+#endif
+
+#undef EXPLICIT_SYMBOL
+ return 0;
+}
+
+void* DynamicLibrary::SearchForAddressOfSymbol(const char* symbolName) {
+ // First check symbols added via AddSymbol().
+ if (ExplicitSymbols) {
+ std::map<std::string, void *>::iterator I =
+ ExplicitSymbols->find(symbolName);
+ std::map<std::string, void *>::iterator E = ExplicitSymbols->end();
+
+ if (I != E)
+ return I->second;
+ }
+
+ // Now search the libraries.
+ if (OpenedHandles) {
+ for (std::vector<void *>::iterator I = OpenedHandles->begin(),
+ E = OpenedHandles->end(); I != E; ++I) {
+ //lt_ptr ptr = lt_dlsym(*I, symbolName);
+ void *ptr = dlsym(*I, symbolName);
+ if (ptr) {
+ return ptr;
+ }
+ }
+ }
+
+ if (void *Result = SearchForAddressOfSpecialSymbol(symbolName))
+ return Result;
+
// This macro returns the address of a well-known, explicit symbol
#define EXPLICIT_SYMBOL(SYM) \
if (!strcmp(symbolName, #SYM)) return &SYM
#endif
#ifndef stderr
EXPLICIT_SYMBOL(stderr);
-#endif
-#ifndef errno
- EXPLICIT_SYMBOL(errno);
#endif
}
#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
-
-DEFINING_FILE_FOR(SystemDynamicLibrary)