166 lines
4.7 KiB
C++
166 lines
4.7 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 is distributed under the University of Illinois Open Source
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// 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 <cstdio>
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#include <cstring>
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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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std::map<std::string, void *> &g_symbols() {
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static std::map<std::string, void *> symbols;
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return symbols;
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}
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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 <dlfcn.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 std::vector<lt_dlhandle> OpenedHandles;
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static std::vector<void *> OpenedHandles;
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DynamicLibrary::DynamicLibrary() {}
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DynamicLibrary::~DynamicLibrary() {
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while(!OpenedHandles.empty()) {
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void *H = OpenedHandles.back(); OpenedHandles.pop_back();
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dlclose(H);
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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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void *H = dlopen(Filename, RTLD_LAZY|RTLD_GLOBAL);
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if (H == 0) {
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if (ErrMsg)
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*ErrMsg = dlerror();
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return true;
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}
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OpenedHandles.push_back(H);
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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<void *>::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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void *ptr = dlsym(*I, symbolName);
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if (ptr)
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return ptr;
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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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// 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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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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}
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#endif
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#ifdef __CYGWIN__
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{
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EXPLICIT_SYMBOL(_alloca);
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EXPLICIT_SYMBOL(__main);
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}
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#endif
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#undef EXPLICIT_SYMBOL
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// This macro returns the address of a well-known, explicit symbol
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#define EXPLICIT_SYMBOL(SYM) \
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if (!strcmp(symbolName, #SYM)) return &SYM
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// On linux we have a weird situation. The stderr/out/in symbols are both
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// macros and global variables because of standards requirements. So, we
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// boldly use the EXPLICIT_SYMBOL macro without checking for a #define first.
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#if defined(__linux__)
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{
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EXPLICIT_SYMBOL(stderr);
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EXPLICIT_SYMBOL(stdout);
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EXPLICIT_SYMBOL(stdin);
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}
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#else
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// For everything else, we want to check to make sure the symbol isn't defined
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// as a macro before using EXPLICIT_SYMBOL.
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{
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#ifndef stdin
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EXPLICIT_SYMBOL(stdin);
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#endif
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#ifndef stdout
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EXPLICIT_SYMBOL(stdout);
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#endif
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#ifndef stderr
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EXPLICIT_SYMBOL(stderr);
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#endif
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}
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#endif
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#undef EXPLICIT_SYMBOL
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return 0;
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}
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#endif // LLVM_ON_WIN32
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