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Also, the assert could never fire due to || instead of &&. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29977 91177308-0d34-0410-b5e6-96231b3b80d8
178 lines
5.2 KiB
C++
178 lines
5.2 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 "llvm/Config/config.h"
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#include <map>
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// Collection of symbol name/value pairs to be searched prior to any libraries.
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static std::map<std::string, void *> g_symbols;
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void llvm::sys::DynamicLibrary::AddSymbol(const char* symbolName,
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void *symbolValue) {
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g_symbols[symbolName] = symbolValue;
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}
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// It is not possible to use ltdl.c on VC++ builds as the terms of its LGPL
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// license and special exception would cause all of LLVM to be placed under
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// the LGPL. This is because the exception applies only when libtool is
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// used, and obviously libtool is not used with Visual Studio. An entirely
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// separate implementation is provided in win32/DynamicLibrary.cpp.
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#ifdef LLVM_ON_WIN32
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#include "Win32/DynamicLibrary.inc"
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#else
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#include "ltdl.h"
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#include <cassert>
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using namespace llvm;
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using namespace llvm::sys;
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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 inline void check_ltdl_initialization() {
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static bool did_initialize_ltdl = false;
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if (!did_initialize_ltdl) {
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int Err = lt_dlinit();
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assert(0 == Err && "Can't init the ltdl library");
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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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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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assert(a_handle == 0 || "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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/*
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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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*/
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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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return;
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}
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}
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}
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}
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bool DynamicLibrary::LoadLibraryPermanently(const char *Filename,
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std::string *ErrMsg) {
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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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if (ErrMsg)
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*ErrMsg = std::string("Can't open :") +
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(Filename ? Filename : "<current process>") + ": " + lt_dlerror();
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return true;
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}
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lt_dlmakeresident(a_handle);
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OpenedHandles.push_back(a_handle);
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return false;
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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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// First check symbols added via AddSymbol().
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std::map<std::string, void *>::iterator I = g_symbols.find(symbolName);
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if (I != g_symbols.end())
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return I->second;
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// Now search the libraries.
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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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// If this is darwin, it has some funky issues, try to solve them here. Some
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// important symbols are marked 'private external' which doesn't allow
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// SearchForAddressOfSymbol to find them. As such, we special case them here,
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// there is only a small handful of them.
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#ifdef __APPLE__
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{
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#define EXPLICIT_SYMBOL(SYM) \
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extern void *SYM; if (!strcmp(symbolName, #SYM)) return &SYM
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EXPLICIT_SYMBOL(__ashldi3);
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EXPLICIT_SYMBOL(__ashrdi3);
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EXPLICIT_SYMBOL(__cmpdi2);
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EXPLICIT_SYMBOL(__divdi3);
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EXPLICIT_SYMBOL(__eprintf);
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EXPLICIT_SYMBOL(__fixdfdi);
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EXPLICIT_SYMBOL(__fixsfdi);
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EXPLICIT_SYMBOL(__fixunsdfdi);
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EXPLICIT_SYMBOL(__fixunssfdi);
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EXPLICIT_SYMBOL(__floatdidf);
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EXPLICIT_SYMBOL(__floatdisf);
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EXPLICIT_SYMBOL(__lshrdi3);
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EXPLICIT_SYMBOL(__moddi3);
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EXPLICIT_SYMBOL(__udivdi3);
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EXPLICIT_SYMBOL(__umoddi3);
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#undef EXPLICIT_SYMBOL
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}
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#endif
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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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#endif // LLVM_ON_WIN32
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DEFINING_FILE_FOR(SystemDynamicLibrary)
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