Home | History | Annotate | Download | only in Windows 
      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 
     34 namespace llvm {
     35 using namespace sys;
     36 
     37 //===----------------------------------------------------------------------===//
     38 //=== WARNING: Implementation here must contain only Win32 specific code
     39 //===          and must not be UNIX code.
     40 //===----------------------------------------------------------------------===//
     41 
     42 static DenseSet<HMODULE> *OpenedHandles;
     43 
     44 extern "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 
     72 DynamicLibrary 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 
    116 void* 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 
    154 void *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