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//===- Win32/DynamicLibrary.cpp - Win32 DL Implementation -------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Jeff Cohen and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file provides the Win32 specific implementation of DynamicLibrary.
//
//===----------------------------------------------------------------------===//
#include "Win32.h"
#include <dbghelp.h>
#pragma comment(lib, "dbghelp.lib")
namespace llvm {
using namespace sys;
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only Win32 specific code
//=== and must not be UNIX code.
//===----------------------------------------------------------------------===//
static std::vector<HMODULE> OpenedHandles;
BOOL CALLBACK ELM_Callback(PSTR ModuleName,
ULONG ModuleBase,
ULONG ModuleSize,
PVOID UserContext)
{
OpenedHandles.push_back((HMODULE)ModuleBase);
return TRUE;
}
DynamicLibrary::DynamicLibrary() : handle(0) {
handle = GetModuleHandle(NULL);
OpenedHandles.push_back((HMODULE)handle);
}
DynamicLibrary::DynamicLibrary(const char*filename) : handle(0) {
HMODULE a_handle = LoadLibrary(filename);
if (a_handle == 0)
ThrowError(std::string(filename) + ": Can't open : ");
handle = a_handle;
OpenedHandles.push_back(a_handle);
}
DynamicLibrary::~DynamicLibrary() {
if (handle == 0)
return;
// GetModuleHandle() does not increment the ref count, so we must not free
// the handle to the executable.
if (handle != GetModuleHandle(NULL))
FreeLibrary((HMODULE)handle);
handle = 0;
for (std::vector<HMODULE>::iterator I = OpenedHandles.begin(),
E = OpenedHandles.end(); I != E; ++I) {
if (*I == handle) {
// Note: don't use the swap/pop_back trick here. Order is important.
OpenedHandles.erase(I);
}
}
}
void DynamicLibrary::LoadLibraryPermanently(const char* filename) {
if (filename) {
HMODULE a_handle = LoadLibrary(filename);
if (a_handle == 0)
ThrowError(std::string(filename) + ": Can't open : ");
OpenedHandles.push_back(a_handle);
} else {
// When no file is specified, enumerate all DLLs and EXEs in the
// process.
EnumerateLoadedModules(GetCurrentProcess(), ELM_Callback, 0);
}
// Because we don't remember the handles, we will never free them; hence,
// it is loaded permanently.
}
void* DynamicLibrary::SearchForAddressOfSymbol(const char* symbolName) {
for (std::vector<HMODULE>::iterator I = OpenedHandles.begin(),
E = OpenedHandles.end(); I != E; ++I) {
FARPROC ptr = GetProcAddress((HMODULE)*I, symbolName);
if (ptr)
return ptr;
}
return 0;
}
void *DynamicLibrary::GetAddressOfSymbol(const char *symbolName) {
assert(handle != 0 && "Invalid DynamicLibrary handle");
return GetProcAddress((HMODULE)handle, symbolName);
}
}
// vim: sw=2 smartindent smarttab tw=80 autoindent expandtab
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