//
// 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/Support/ManagedStatic.h"
-#include "llvm/System/RWMutex.h"
+#include "llvm/System/Mutex.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*> symbols;
-static llvm::sys::SmartRWMutex<true> SymbolsLock;
+static std::map<std::string, void*> *ExplicitSymbols = 0;
+
+namespace {
+
+struct ExplicitSymbolsDeleter {
+ ~ExplicitSymbolsDeleter() {
+ if (ExplicitSymbols)
+ delete ExplicitSymbols;
+ }
+};
+
+}
+
+static ExplicitSymbolsDeleter Dummy;
void llvm::sys::DynamicLibrary::AddSymbol(const char* symbolName,
void *symbolValue) {
- llvm::sys::SmartScopedWriter<true> Writer(&SymbolsLock);
- symbols[symbolName] = symbolValue;
+ if (ExplicitSymbols == 0)
+ ExplicitSymbols = new std::map<std::string, void*>();
+ (*ExplicitSymbols)[symbolName] = symbolValue;
}
#ifdef LLVM_ON_WIN32
#else
+#if HAVE_DLFCN_H
#include <dlfcn.h>
-#include <cassert>
using namespace llvm;
using namespace llvm::sys;
//=== independent code.
//===----------------------------------------------------------------------===//
-static std::vector<void *> OpenedHandles;
+static SmartMutex<true>* HandlesMutex;
+static std::vector<void *> *OpenedHandles = 0;
-DynamicLibrary::DynamicLibrary() {}
+static bool InitializeMutex() {
+ HandlesMutex = new SmartMutex<true>;
+ return HandlesMutex != 0;
+}
-DynamicLibrary::~DynamicLibrary() {
- SmartScopedWriter<true> Writer(&SymbolsLock);
- while(!OpenedHandles.empty()) {
- void *H = OpenedHandles.back();
- OpenedHandles.pop_back();
- dlclose(H);
- }
+static bool EnsureMutexInitialized() {
+ static bool result = InitializeMutex();
+ return result;
}
+
bool DynamicLibrary::LoadLibraryPermanently(const char *Filename,
std::string *ErrMsg) {
- SmartScopedWriter<true> Writer(&SymbolsLock);
void *H = dlopen(Filename, RTLD_LAZY|RTLD_GLOBAL);
if (H == 0) {
- if (ErrMsg)
- *ErrMsg = dlerror();
+ if (ErrMsg) *ErrMsg = dlerror();
return true;
}
- OpenedHandles.push_back(H);
+#ifdef __CYGWIN__
+ // Cygwin searches symbols only in the main
+ // with the handle of dlopen(NULL, RTLD_GLOBAL).
+ if (Filename == NULL)
+ H = RTLD_DEFAULT;
+#endif
+ EnsureMutexInitialized();
+ SmartScopedLock<true> Lock(*HandlesMutex);
+ if (OpenedHandles == 0)
+ OpenedHandles = new std::vector<void *>();
+ OpenedHandles->push_back(H);
return false;
}
+#else
+
+using namespace llvm;
+using namespace llvm::sys;
+
+bool DynamicLibrary::LoadLibraryPermanently(const char *Filename,
+ std::string *ErrMsg) {
+ if (ErrMsg) *ErrMsg = "dlopen() not supported on this platform";
+ return true;
+}
+#endif
+
+namespace llvm {
+void *SearchForAddressOfSpecialSymbol(const char* symbolName);
+}
void* DynamicLibrary::SearchForAddressOfSymbol(const char* symbolName) {
// First check symbols added via AddSymbol().
- SymbolsLock.reader_acquire();
- std::map<std::string, void *>::iterator I = symbols.find(symbolName);
- std::map<std::string, void *>::iterator E = symbols.end();
- SymbolsLock.reader_release();
+ 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;
+ if (I != E)
+ return I->second;
+ }
- SymbolsLock.writer_acquire();
+#if HAVE_DLFCN_H
// Now search the libraries.
- 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) {
- SymbolsLock.writer_release();
- return ptr;
+ EnsureMutexInitialized();
+ SmartScopedLock<true> Lock(*HandlesMutex);
+ 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;
+ }
}
}
- SymbolsLock.writer_release();
-
-#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
- // SearchForAddressOfSymbol to find them. As such, we special case them here,
- // there is only a small handful of them.
-
-#ifdef __APPLE__
- {
- 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);
- }
#endif
-#ifdef __CYGWIN__
- {
- EXPLICIT_SYMBOL(_alloca);
- EXPLICIT_SYMBOL(__main);
- }
-#endif
-
-#undef EXPLICIT_SYMBOL
+ if (void *Result = llvm::SearchForAddressOfSpecialSymbol(symbolName))
+ return Result;
// This macro returns the address of a well-known, explicit symbol
#define EXPLICIT_SYMBOL(SYM) \
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