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97 lines
3.2 KiB
C++
97 lines
3.2 KiB
C++
//===-- DynamicLinker.cpp - Implement DynamicLinker interface -------------===//
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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 the LLVM research group and is distributed under
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// the 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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// Lightweight interface to dynamic library linking and loading, and dynamic
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// symbol lookup functionality, in whatever form the operating system
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// provides it.
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//
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// Possible future extensions include support for the HPUX shl_load()
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// interface, and the Mac OS X NSLinkModule() interface.
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//
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// Note that we assume that if dlopen() is available, then dlsym() is too.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/DynamicLinker.h"
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#include "llvm/Config/dlfcn.h"
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#include "llvm/Config/windows.h"
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#include <vector>
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#include <cassert>
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#include <cstdio>
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using namespace llvm;
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#if defined(HAVE_WINDOWS_H)
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// getLoadedLibs - Keep track of the shared objects that are loaded into the
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// process address space, as the windows GetProcAddress function does not
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// automatically search an entire address space, it only searches a specific
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// object.
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static std::vector<HMODULE> &getLoadedLibHandles() {
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static std::vector<HMODULE> *LoadedLibHandles = 0;
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if (LoadedLibHandles == 0) {
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LoadedLibHandles = new std::vector<HMODULE>();
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if (HMODULE H = GetModuleHandle(NULL)) // JIT symbols
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LoadedLibHandles->push_back(H);
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if (HMODULE MH = GetModuleHandle("cygwin1.dll")) // Cygwin symbols OR
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LoadedLibHandles->push_back(MH);
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else if (HMODULE MH = GetModuleHandle("msvcr80.dll")) // VC++ symbols
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LoadedLibHandles->push_back(MH);
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}
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return *LoadedLibHandles;
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}
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#endif
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bool llvm::LinkDynamicObject(const char *filename, std::string *ErrorMessage) {
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#if defined(HAVE_WINDOWS_H)
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if (HMODULE Handle = LoadLibrary(filename)) {
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// Allow GetProcAddress in this module
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getLoadedLibHandles().push_back(Handle);
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return false;
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}
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if (ErrorMessage) {
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char Buffer[100];
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// FIXME: This should use FormatMessage
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sprintf(Buffer, "Windows error code %d\n", GetLastError());
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*ErrorMessage = Buffer;
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}
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return true;
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#elif defined (HAVE_DLOPEN)
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if (dlopen (filename, RTLD_NOW | RTLD_GLOBAL) == 0) {
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if (ErrorMessage) *ErrorMessage = dlerror ();
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return true;
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}
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return false;
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#else
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assert (0 && "Dynamic object linking not implemented for this platform");
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#endif
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}
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void *llvm::GetAddressOfSymbol(const char *symbolName) {
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#if defined(HAVE_WINDOWS_H)
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std::vector<HMODULE> &LH = getLoadedLibHandles();
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for (unsigned i = 0, e = LH.size(); i != e; ++i)
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if (void *Val = (void*)GetProcAddress(LH[i], symbolName))
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return Val;
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return 0;
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#elif defined(HAVE_DLOPEN)
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# ifdef RTLD_DEFAULT
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return dlsym (RTLD_DEFAULT, symbolName);
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# else
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static void* CurHandle = dlopen(0, RTLD_LAZY);
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return dlsym(CurHandle, symbolName);
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# endif
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#else
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assert (0 && "Dynamic symbol lookup not implemented for this platform");
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#endif
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}
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// soft, cushiony C++ interface.
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void *llvm::GetAddressOfSymbol(const std::string &symbolName) {
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return GetAddressOfSymbol(symbolName.c_str());
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}
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