//
// 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;
+
+namespace {
+
+struct ExplicitSymbolsDeleter {
+ ~ExplicitSymbolsDeleter() {
+ if (ExplicitSymbols)
+ delete ExplicitSymbols;
+ }
+};
-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.
+static ExplicitSymbolsDeleter Dummy;
+
+void llvm::sys::DynamicLibrary::AddSymbol(const char* symbolName,
+ void *symbolValue) {
+ if (ExplicitSymbols == 0)
+ ExplicitSymbols = new std::map<std::string, void*>();
+ (*ExplicitSymbols)[symbolName] = symbolValue;
+}
#ifdef LLVM_ON_WIN32
#else
-#include "ltdl.h"
-#include <cassert>
+#if HAVE_DLFCN_H
+#include <dlfcn.h>
using namespace llvm;
using namespace llvm::sys;
//=== independent code.
//===----------------------------------------------------------------------===//
-static bool did_initialize_ltdl = false;
+static std::vector<void *> *OpenedHandles = 0;
-static inline void check_ltdl_initialization() {
- if (!did_initialize_ltdl) {
- if (0 != lt_dlinit())
- throw std::string(lt_dlerror());
- did_initialize_ltdl = true;
+
+bool DynamicLibrary::LoadLibraryPermanently(const char *Filename,
+ std::string *ErrMsg) {
+ void *H = dlopen(Filename, RTLD_LAZY|RTLD_GLOBAL);
+ if (H == 0) {
+ if (ErrMsg) *ErrMsg = dlerror();
+ return true;
}
+#ifdef __CYGWIN__
+ // Cygwin searches symbols only in the main
+ // with the handle of dlopen(NULL, RTLD_GLOBAL).
+ if (Filename == NULL)
+ H = RTLD_DEFAULT;
+#endif
+ if (OpenedHandles == 0)
+ OpenedHandles = new std::vector<void *>();
+ OpenedHandles->push_back(H);
+ return false;
}
+#else
-static std::vector<lt_dlhandle> OpenedHandles;
-
-DynamicLibrary::DynamicLibrary() : handle(0) {
- check_ltdl_initialization();
-
- lt_dlhandle a_handle = lt_dlopen(0);
-
- if (a_handle == 0)
- throw std::string("Can't open program as dynamic library");
+using namespace llvm;
+using namespace llvm::sys;
- handle = a_handle;
- OpenedHandles.push_back(a_handle);
+bool DynamicLibrary::LoadLibraryPermanently(const char *Filename,
+ std::string *ErrMsg) {
+ if (ErrMsg) *ErrMsg = "dlopen() not supported on this platform";
+ return true;
}
+#endif
-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);
-
- if (a_handle == 0)
- throw std::string("Can't open :") + filename + ": " + lt_dlerror();
-
- handle = a_handle;
- OpenedHandles.push_back(a_handle);
+namespace llvm {
+void *SearchForAddressOfSpecialSymbol(const char* symbolName);
}
-DynamicLibrary::~DynamicLibrary() {
- lt_dlhandle a_handle = (lt_dlhandle) handle;
- if (a_handle) {
- lt_dlclose(a_handle);
+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;
+ }
- 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);
+#if HAVE_DLFCN_H
+ // 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;
}
}
}
-}
-
-void DynamicLibrary::LoadLibraryPermanently(const char* filename) {
- check_ltdl_initialization();
- lt_dlhandle a_handle = lt_dlopen(filename);
-
- if (a_handle == 0)
- a_handle = lt_dlopenext(filename);
-
- if (a_handle == 0)
- throw std::string("Can't open :") + filename + ": " + lt_dlerror();
-
- lt_dlmakeresident(a_handle);
-
- OpenedHandles.push_back(a_handle);
-}
+#endif
-void* DynamicLibrary::SearchForAddressOfSymbol(const char* symbolName) {
- check_ltdl_initialization();
+ if (void *Result = llvm::SearchForAddressOfSpecialSymbol(symbolName))
+ return Result;
- // 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;
+// This macro returns the address of a well-known, explicit symbol
+#define EXPLICIT_SYMBOL(SYM) \
+ if (!strcmp(symbolName, #SYM)) return &SYM
- // 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;
+// 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);
}
-
- // 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__
+#else
+ // For everything else, we want to check to make sure the symbol isn't defined
+ // as a macro before using EXPLICIT_SYMBOL.
{
-#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
+#ifndef stdin
+ EXPLICIT_SYMBOL(stdin);
+#endif
+#ifndef stdout
+ EXPLICIT_SYMBOL(stdout);
+#endif
+#ifndef stderr
+ EXPLICIT_SYMBOL(stderr);
+#endif
}
#endif
+#undef EXPLICIT_SYMBOL
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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