1 //===- Win32/DynamicLibrary.cpp - Win32 DL Implementation -------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file provides the Win32 specific implementation of DynamicLibrary.
12 //===----------------------------------------------------------------------===//
23 #if (HAVE_LIBIMAGEHLP != 1)
24 #error "libimagehlp.a should be present"
27 #pragma comment(lib, "dbghelp.lib")
33 //===----------------------------------------------------------------------===//
34 //=== WARNING: Implementation here must contain only Win32 specific code
35 //=== and must not be UNIX code.
36 //===----------------------------------------------------------------------===//
38 static std::vector<HMODULE> OpenedHandles;
41 typedef DWORD64 ModuleBaseType;
43 typedef ULONG ModuleBaseType;
47 static BOOL CALLBACK ELM_Callback(PSTR ModuleName,
48 ModuleBaseType ModuleBase,
52 // Ignore VC++ runtimes prior to 7.1. Somehow some of them get loaded
54 if (stricmp(ModuleName, "msvci70") != 0 &&
55 stricmp(ModuleName, "msvcirt") != 0 &&
56 stricmp(ModuleName, "msvcp50") != 0 &&
57 stricmp(ModuleName, "msvcp60") != 0 &&
58 stricmp(ModuleName, "msvcp70") != 0 &&
59 stricmp(ModuleName, "msvcr70") != 0 &&
61 // Mingw32 uses msvcrt.dll by default. Don't ignore it.
62 // Otherwise, user should be aware, what he's doing :)
63 stricmp(ModuleName, "msvcrt") != 0 &&
65 stricmp(ModuleName, "msvcrt20") != 0 &&
66 stricmp(ModuleName, "msvcrt40") != 0) {
67 OpenedHandles.push_back((HMODULE)ModuleBase);
73 DynamicLibrary::DynamicLibrary() : handle(0) {
74 handle = GetModuleHandle(NULL);
75 OpenedHandles.push_back((HMODULE)handle);
78 DynamicLibrary::~DynamicLibrary() {
82 // GetModuleHandle() does not increment the ref count, so we must not free
83 // the handle to the executable.
84 if (handle != GetModuleHandle(NULL))
85 FreeLibrary((HMODULE)handle);
88 for (std::vector<HMODULE>::iterator I = OpenedHandles.begin(),
89 E = OpenedHandles.end(); I != E; ++I) {
91 // Note: don't use the swap/pop_back trick here. Order is important.
92 OpenedHandles.erase(I);
97 // Stack probing routines are in the support library (e.g. libgcc), but we don't
98 // have dynamic linking on windows. Provide a hook.
99 #if defined(__MINGW32__) || defined (_MSC_VER)
100 #define EXPLICIT_SYMBOL(SYM) \
101 if (!strcmp(symbolName, #SYM)) return (void*)&SYM
102 #define EXPLICIT_SYMBOL2(SYMFROM, SYMTO) \
103 if (!strcmp(symbolName, #SYMFROM)) return (void*)&SYMTO
104 #define EXPLICIT_SYMBOL_DEF(SYM) \
105 extern "C" { extern void *SYM; }
107 #if defined(__MINGW32__)
108 EXPLICIT_SYMBOL_DEF(_alloca);
109 #elif defined(_MSC_VER)
110 EXPLICIT_SYMBOL_DEF(_alloca_probe);
114 bool DynamicLibrary::LoadLibraryPermanently(const char *filename,
115 std::string *ErrMsg) {
117 HMODULE a_handle = LoadLibrary(filename);
120 return MakeErrMsg(ErrMsg, std::string(filename) + ": Can't open : ");
122 OpenedHandles.push_back(a_handle);
124 // When no file is specified, enumerate all DLLs and EXEs in the
126 EnumerateLoadedModules(GetCurrentProcess(), ELM_Callback, 0);
129 // Because we don't remember the handle, we will never free it; hence,
130 // it is loaded permanently.
134 void* DynamicLibrary::SearchForAddressOfSymbol(const char* symbolName) {
135 // First check symbols added via AddSymbol().
136 std::map<std::string, void *>::iterator I = g_symbols.find(symbolName);
137 if (I != g_symbols.end())
140 // Now search the libraries.
141 for (std::vector<HMODULE>::iterator I = OpenedHandles.begin(),
142 E = OpenedHandles.end(); I != E; ++I) {
143 FARPROC ptr = GetProcAddress((HMODULE)*I, symbolName);
148 #if defined(__MINGW32__)
150 EXPLICIT_SYMBOL(_alloca);
151 EXPLICIT_SYMBOL2(alloca, _alloca);
152 #undef EXPLICIT_SYMBOL
153 #undef EXPLICIT_SYMBOL2
154 #undef EXPLICIT_SYMBOL_DEF
156 #elif defined(_MSC_VER)
158 EXPLICIT_SYMBOL2(alloca, _alloca_probe);
159 EXPLICIT_SYMBOL2(_alloca, _alloca_probe);
160 #undef EXPLICIT_SYMBOL
161 #undef EXPLICIT_SYMBOL2
162 #undef EXPLICIT_SYMBOL_DEF
169 void *DynamicLibrary::GetAddressOfSymbol(const char *symbolName) {
170 assert(handle != 0 && "Invalid DynamicLibrary handle");
171 return (void *) GetProcAddress((HMODULE)handle, symbolName);