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19cd4a9e6b
SearchForAddressOfSymbol. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18355 91177308-0d34-0410-b5e6-96231b3b80d8
113 lines
3.1 KiB
C++
113 lines
3.1 KiB
C++
//===-- DynamicLibrary.cpp - Runtime link/load libraries --------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Reid Spencer and is distributed under the
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// University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This header file implements the operating system DynamicLibrary concept.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/System/DynamicLibrary.h"
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#include "ltdl.h"
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#include <cassert>
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only TRULY operating system
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//=== independent code.
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//===----------------------------------------------------------------------===//
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static bool did_initialize_ltdl = false;
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static inline void check_ltdl_initialization() {
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if (!did_initialize_ltdl) {
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if (0 != lt_dlinit())
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throw std::string(lt_dlerror());
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did_initialize_ltdl = true;
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}
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}
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static std::vector<lt_dlhandle> OpenedHandles;
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namespace llvm {
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using namespace sys;
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DynamicLibrary::DynamicLibrary() : handle(0) {
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check_ltdl_initialization();
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lt_dlhandle a_handle = lt_dlopen(0);
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if (a_handle == 0)
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throw std::string("Can't open program as dynamic library");
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handle = a_handle;
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OpenedHandles.push_back(a_handle);
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}
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DynamicLibrary::DynamicLibrary(const char*filename) : handle(0) {
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check_ltdl_initialization();
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lt_dlhandle a_handle = lt_dlopen(filename);
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if (a_handle == 0)
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a_handle = lt_dlopenext(filename);
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if (a_handle == 0)
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throw std::string("Can't open :") + filename + ": " + lt_dlerror();
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handle = a_handle;
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OpenedHandles.push_back(a_handle);
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}
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DynamicLibrary::~DynamicLibrary() {
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lt_dlhandle a_handle = (lt_dlhandle) handle;
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if (a_handle) {
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lt_dlclose(a_handle);
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for (std::vector<lt_dlhandle>::iterator I = OpenedHandles.begin(),
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E = OpenedHandles.end(); I != E; ++I) {
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if (*I == a_handle) {
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// Note: don't use the swap/pop_back trick here. Order is important.
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OpenedHandles.erase(I);
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}
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}
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}
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}
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void DynamicLibrary::LoadLibraryPermanently(const char* filename) {
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check_ltdl_initialization();
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lt_dlhandle a_handle = lt_dlopen(filename);
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if (a_handle == 0)
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a_handle = lt_dlopenext(filename);
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if (a_handle == 0)
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throw std::string("Can't open :") + filename + ": " + lt_dlerror();
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lt_dlmakeresident(a_handle);
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OpenedHandles.push_back(a_handle);
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}
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void* DynamicLibrary::SearchForAddressOfSymbol(const char* symbolName) {
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check_ltdl_initialization();
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for (std::vector<lt_dlhandle>::iterator I = OpenedHandles.begin(),
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E = OpenedHandles.end(); I != E; ++I) {
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lt_ptr ptr = lt_dlsym(*I, symbolName);
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if (ptr)
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return ptr;
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}
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return 0;
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}
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void *DynamicLibrary::GetAddressOfSymbol(const char *symbolName) {
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assert(handle != 0 && "Invalid DynamicLibrary handle");
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return lt_dlsym((lt_dlhandle) handle, symbolName);
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}
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} // namespace llvm
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