//
// 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.
//
//===----------------------------------------------------------------------===//
//
#include "llvm/System/DynamicLibrary.h"
#include "llvm/Config/config.h"
+#include <cstdio>
+#include <cstring>
+#include <map>
+
+// Collection of symbol name/value pairs to be searched prior to any libraries.
+std::map<std::string, void *> &g_symbols() {
+ static std::map<std::string, void *> symbols;
+ return 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
#else
-#include "ltdl.h"
+//#include "ltdl.h"
+#include <dlfcn.h>
#include <cassert>
using namespace llvm;
using namespace llvm::sys;
//=== independent code.
//===----------------------------------------------------------------------===//
-static bool did_initialize_ltdl = false;
-
-static inline void check_ltdl_initialization() {
- if (!did_initialize_ltdl) {
- if (0 != lt_dlinit())
- throw std::string(lt_dlerror());
- did_initialize_ltdl = true;
- }
-}
-
-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");
-
- handle = a_handle;
- OpenedHandles.push_back(a_handle);
-}
-
-DynamicLibrary::DynamicLibrary(const char*filename) : handle(0) {
- check_ltdl_initialization();
+//static std::vector<lt_dlhandle> OpenedHandles;
+static std::vector<void *> OpenedHandles;
- 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);
-}
+DynamicLibrary::DynamicLibrary() {}
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);
- }
- }
+ while(!OpenedHandles.empty()) {
+ void *H = OpenedHandles.back(); OpenedHandles.pop_back();
+ dlclose(H);
}
}
-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);
+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;
+ }
+ OpenedHandles.push_back(H);
+ return false;
}
void* DynamicLibrary::SearchForAddressOfSymbol(const char* symbolName) {
- check_ltdl_initialization();
- for (std::vector<lt_dlhandle>::iterator I = OpenedHandles.begin(),
+ // 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<void *>::iterator I = OpenedHandles.begin(),
E = OpenedHandles.end(); I != E; ++I) {
- lt_ptr ptr = lt_dlsym(*I, symbolName);
+ //lt_ptr ptr = lt_dlsym(*I, symbolName);
+ void *ptr = dlsym(*I, symbolName);
if (ptr)
return ptr;
}
+#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__
{
-#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);
+ }
+#endif
+
+#ifdef __CYGWIN__
+ {
+ EXPLICIT_SYMBOL(_alloca);
+ EXPLICIT_SYMBOL(__main);
+ }
+#endif
+
#undef EXPLICIT_SYMBOL
+
+// 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;
}
-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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