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0f706ab789
DynamicLibrary::SearchForAddressOfSymbol and force them to have "C" linkage. Interestingly, GCC treats the block-scoped "extern" declarations we previously had as if they were extern "C" declarations (or, at least, were in the global namespace), so that GCC bug papered over this LLVM bug. Clang and EDG get the linkage correct; this new variant seems to work for both GCC and Clang. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92020 91177308-0d34-0410-b5e6-96231b3b80d8
144 lines
4.1 KiB
C++
144 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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static 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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} 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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#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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#define EXPLICIT_SYMBOL(SYM) \
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extern "C" void *SYM;
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#include "DynamicLibrarySymbolDefs.def"
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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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// 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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#define EXPLICIT_SYMBOL(SYM) \
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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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{
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#include "DynamicLibrarySymbolDefs.def"
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}
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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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