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//===-- DynamicLibrary.cpp - Runtime link/load libraries --------*- C++ -*-===//
//
// 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 header file implements the operating system DynamicLibrary concept.
//
//===----------------------------------------------------------------------===//
#include "llvm/System/DynamicLibrary.h"
#include "ltdl.h"
#include <cassert>
using namespace llvm;
using namespace llvm::sys;
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only TRULY operating system
//=== 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();
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() {
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);
}
}
}
}
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);
}
void* DynamicLibrary::SearchForAddressOfSymbol(const char* symbolName) {
check_ltdl_initialization();
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;
}
// 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__
{
extern void *__ashldi3; if (Name == "__ashldi3") return &__ashldi3;
extern void *__ashrdi3; if (Name == "__ashrdi3") return &__ashrdi3;
extern void *__cmpdi2; if (Name == "__cmpdi2") return &__cmpdi2;
extern void *__divdi3; if (Name == "__divdi3") return &__divdi3;
extern void *__eprintf; if (Name == "__eprintf") return &__eprintf;
extern void *__fixdfdi; if (Name == "__fixdfdi") return &__fixdfdi;
extern void *__fixsfdi; if (Name == "__fixsfdi") return &__fixsfdi;
extern void *__fixunsdfdi; if (Name == "__fixunsdfdi") return &__fixunsdfdi;
extern void *__fixunssfdi; if (Name == "__fixunssfdi") return &__fixunssfdi;
extern void *__floatdidf; if (Name == "__floatdidf") return &__floatdidf;
extern void *__floatdisf; if (Name == "__floatdisf") return &__floatdisf;
extern void *__lshrdi3; if (Name == "__lshrdi3") return &__lshrdi3;
extern void *__moddi3; if (Name == "__moddi3") return &__moddi3;
extern void *__udivdi3; if (Name == "__udivdi3") return &__udivdi3;
extern void *__umoddi3; if (Name == "__umoddi3") return &__umoddi3;
}
#endif
return 0;
}
void *DynamicLibrary::GetAddressOfSymbol(const char *symbolName) {
assert(handle != 0 && "Invalid DynamicLibrary handle");
return lt_dlsym((lt_dlhandle) handle, symbolName);
}
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