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1//===- Win32/DynamicLibrary.cpp - Win32 DL Implementation -------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file provides the Win32 specific implementation of DynamicLibrary.
11//
12//===----------------------------------------------------------------------===//
13
14#include "Windows.h"
15
16#ifdef __MINGW32__
17 #include <imagehlp.h>
18#else
19 #include <dbghelp.h>
20#endif
21
22#ifdef _MSC_VER
23 #include <ntverp.h>
24#endif
25
26#ifdef __MINGW32__
27 #if (HAVE_LIBIMAGEHLP != 1)
28  #error "libimagehlp.a should be present"
29 #endif
30#else
31 #pragma comment(lib, "dbghelp.lib")
32#endif
33
34namespace llvm {
35using namespace sys;
36
37//===----------------------------------------------------------------------===//
38//=== WARNING: Implementation here must contain only Win32 specific code
39//===          and must not be UNIX code.
40//===----------------------------------------------------------------------===//
41
42static DenseSet<HMODULE> *OpenedHandles;
43
44extern "C" {
45
46  static BOOL CALLBACK ELM_Callback(WIN32_ELMCB_PCSTR ModuleName,
47                                    ULONG_PTR ModuleBase,
48                                    ULONG ModuleSize,
49                                    PVOID UserContext)
50  {
51    // Ignore VC++ runtimes prior to 7.1.  Somehow some of them get loaded
52    // into the process.
53    if (stricmp(ModuleName, "msvci70") != 0 &&
54        stricmp(ModuleName, "msvcirt") != 0 &&
55        stricmp(ModuleName, "msvcp50") != 0 &&
56        stricmp(ModuleName, "msvcp60") != 0 &&
57        stricmp(ModuleName, "msvcp70") != 0 &&
58        stricmp(ModuleName, "msvcr70") != 0 &&
59#ifndef __MINGW32__
60        // Mingw32 uses msvcrt.dll by default. Don't ignore it.
61        // Otherwise, user should be aware, what he's doing :)
62        stricmp(ModuleName, "msvcrt") != 0 &&
63#endif
64        stricmp(ModuleName, "msvcrt20") != 0 &&
65        stricmp(ModuleName, "msvcrt40") != 0) {
66      OpenedHandles->insert((HMODULE)ModuleBase);
67    }
68    return TRUE;
69  }
70}
71
72DynamicLibrary DynamicLibrary::getPermanentLibrary(const char *filename,
73                                                   std::string *errMsg) {
74  SmartScopedLock<true> lock(getMutex());
75
76  if (!filename) {
77    // When no file is specified, enumerate all DLLs and EXEs in the process.
78    if (OpenedHandles == 0)
79      OpenedHandles = new DenseSet<HMODULE>();
80
81    EnumerateLoadedModules(GetCurrentProcess(), ELM_Callback, 0);
82    // Dummy library that represents "search all handles".
83    // This is mostly to ensure that the return value still shows up as "valid".
84    return DynamicLibrary(&OpenedHandles);
85  }
86
87  HMODULE a_handle = LoadLibrary(filename);
88
89  if (a_handle == 0) {
90    MakeErrMsg(errMsg, std::string(filename) + ": Can't open : ");
91    return DynamicLibrary();
92  }
93
94  if (OpenedHandles == 0)
95    OpenedHandles = new DenseSet<HMODULE>();
96
97  // If we've already loaded this library, FreeLibrary() the handle in order to
98  // keep the internal refcount at +1.
99  if (!OpenedHandles->insert(a_handle).second)
100    FreeLibrary(a_handle);
101
102  return DynamicLibrary(a_handle);
103}
104
105// Stack probing routines are in the support library (e.g. libgcc), but we don't
106// have dynamic linking on windows. Provide a hook.
107#define EXPLICIT_SYMBOL(SYM)                    \
108  extern "C" { extern void *SYM; }
109#define EXPLICIT_SYMBOL2(SYMFROM, SYMTO) EXPLICIT_SYMBOL(SYMTO)
110
111#include "explicit_symbols.inc"
112
113#undef EXPLICIT_SYMBOL
114#undef EXPLICIT_SYMBOL2
115
116void* DynamicLibrary::SearchForAddressOfSymbol(const char* symbolName) {
117  SmartScopedLock<true> Lock(getMutex());
118
119  // First check symbols added via AddSymbol().
120  if (ExplicitSymbols) {
121    StringMap<void *>::iterator i = ExplicitSymbols->find(symbolName);
122
123    if (i != ExplicitSymbols->end())
124      return i->second;
125  }
126
127  // Now search the libraries.
128  if (OpenedHandles) {
129    for (DenseSet<HMODULE>::iterator I = OpenedHandles->begin(),
130         E = OpenedHandles->end(); I != E; ++I) {
131      FARPROC ptr = GetProcAddress((HMODULE)*I, symbolName);
132      if (ptr) {
133        return (void *)(intptr_t)ptr;
134      }
135    }
136  }
137
138  #define EXPLICIT_SYMBOL(SYM)                    \
139    if (!strcmp(symbolName, #SYM)) return (void*)&SYM;
140  #define EXPLICIT_SYMBOL2(SYMFROM, SYMTO)        \
141    if (!strcmp(symbolName, #SYMFROM)) return (void*)&SYMTO;
142
143  {
144    #include "explicit_symbols.inc"
145  }
146
147  #undef EXPLICIT_SYMBOL
148  #undef EXPLICIT_SYMBOL2
149
150  return 0;
151}
152
153
154void *DynamicLibrary::getAddressOfSymbol(const char *symbolName) {
155  if (!isValid())
156    return NULL;
157  if (Data == &OpenedHandles)
158    return SearchForAddressOfSymbol(symbolName);
159  return (void *)(intptr_t)GetProcAddress((HMODULE)Data, symbolName);
160}
161
162
163}
164