forked from OSchip/llvm-project
156 lines
4.1 KiB
C++
156 lines
4.1 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 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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// FIXME: This file leaks the ExplicitSymbols and OpenedHandles vector, and is
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// not thread safe!
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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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#include <vector>
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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*> *ExplicitSymbols = 0;
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namespace {
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struct ExplicitSymbolsDeleter {
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~ExplicitSymbolsDeleter() {
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if (ExplicitSymbols)
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delete ExplicitSymbols;
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}
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};
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}
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static ExplicitSymbolsDeleter Dummy;
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void llvm::sys::DynamicLibrary::AddSymbol(const char* symbolName,
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void *symbolValue) {
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if (ExplicitSymbols == 0)
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ExplicitSymbols = new std::map<std::string, void*>();
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(*ExplicitSymbols)[symbolName] = symbolValue;
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}
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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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#if HAVE_DLFCN_H
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#include <dlfcn.h>
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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<void *> *OpenedHandles = 0;
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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) *ErrMsg = dlerror();
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return true;
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}
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if (OpenedHandles == 0)
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OpenedHandles = new std::vector<void *>();
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OpenedHandles->push_back(H);
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return false;
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}
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#else
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using namespace llvm;
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using namespace llvm::sys;
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bool DynamicLibrary::LoadLibraryPermanently(const char *Filename,
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std::string *ErrMsg) {
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if (ErrMsg) *ErrMsg = "dlopen() not supported on this platform";
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return true;
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}
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#endif
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namespace llvm {
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void *SearchForAddressOfSpecialSymbol(const char* symbolName);
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}
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void* DynamicLibrary::SearchForAddressOfSymbol(const char* symbolName) {
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// First check symbols added via AddSymbol().
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if (ExplicitSymbols) {
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std::map<std::string, void *>::iterator I =
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ExplicitSymbols->find(symbolName);
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std::map<std::string, void *>::iterator E = ExplicitSymbols->end();
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if (I != E)
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return I->second;
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}
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#if HAVE_DLFCN_H
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// Now search the libraries.
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if (OpenedHandles) {
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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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}
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}
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#endif
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if (void *Result = llvm::SearchForAddressOfSpecialSymbol(symbolName))
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return Result;
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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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