1 /*
   2  * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 #include "Platform.h"
  27 #include "Lock.h"
  28 #include "Messages.h"
  29 
  30 #include "WindowsPlatform.h"
  31 #include "LinuxPlatform.h"
  32 #include "MacPlatform.h"
  33 
  34 
  35 // Environment
  36 StaticReadProperty<TString, &Environment::GetNewLine> Environment::NewLine;
  37 
  38 
  39 Platform& Platform::GetInstance() {
  40 
  41 #ifdef WINDOWS
  42     static WindowsPlatform instance;
  43 #endif // WINDOWS
  44 
  45 #ifdef LINUX
  46     static LinuxPlatform instance;
  47 #endif // LINUX
  48 
  49 #ifdef MAC
  50     static MacPlatform instance;
  51 #endif // MAC
  52     return instance;
  53 }
  54 
  55 
  56 Library::Library() {
  57     Initialize();
  58 }
  59 
  60 Library::Library(const TString &FileName) {
  61     Initialize();
  62     Load(FileName);
  63 }
  64 
  65 Library::~Library() {
  66     Unload();
  67 }
  68 
  69 void Library::Initialize() {
  70     FModule = NULL;
  71     FDependentLibraryNames = NULL;
  72     FDependenciesLibraries = NULL;
  73 }
  74 
  75 void Library::InitializeDependencies() {
  76     if (FDependentLibraryNames == NULL) {
  77         FDependentLibraryNames = new std::vector<TString>();
  78     }
  79 
  80     if (FDependenciesLibraries == NULL) {
  81         FDependenciesLibraries = new std::vector<Library*>();
  82     }
  83 }
  84 
  85 void Library::LoadDependencies() {
  86     if (FDependentLibraryNames != NULL && FDependenciesLibraries != NULL) {
  87         for (std::vector<TString>::const_iterator iterator =
  88                 FDependentLibraryNames->begin();
  89                 iterator != FDependentLibraryNames->end(); iterator++) {
  90             Library* library = new Library();
  91 
  92             if (library->Load(*iterator) == true) {
  93                 FDependenciesLibraries->push_back(library);
  94             }
  95         }
  96 
  97         delete FDependentLibraryNames;
  98         FDependentLibraryNames = NULL;
  99     }
 100 }
 101 
 102 void Library::UnloadDependencies() {
 103     if (FDependenciesLibraries != NULL) {
 104         for (std::vector<Library*>::const_iterator iterator =
 105                 FDependenciesLibraries->begin();
 106                 iterator != FDependenciesLibraries->end(); iterator++) {
 107             Library* library = *iterator;
 108 
 109             if (library != NULL) {
 110                 library->Unload();
 111                 delete library;
 112             }
 113         }
 114 
 115         delete FDependenciesLibraries;
 116         FDependenciesLibraries = NULL;
 117     }
 118 }
 119 
 120 Procedure Library::GetProcAddress(const std::string& MethodName) const {
 121     Platform& platform = Platform::GetInstance();
 122     return platform.GetProcAddress(FModule, MethodName);
 123 }
 124 
 125 bool Library::Load(const TString &FileName) {
 126     bool result = true;
 127 
 128     if (FModule == NULL) {
 129         LoadDependencies();
 130         Platform& platform = Platform::GetInstance();
 131         FModule = platform.LoadLibrary(FileName);
 132 
 133         if (FModule == NULL) {
 134             Messages& messages = Messages::GetInstance();
 135             platform.ShowMessage(messages.GetMessage(LIBRARY_NOT_FOUND),
 136                     FileName);
 137             result = false;
 138         } else {
 139             fname = PlatformString(FileName).toStdString();
 140         }
 141     }
 142 
 143     return result;
 144 }
 145 
 146 bool Library::Unload() {
 147     bool result = false;
 148 
 149     if (FModule != NULL) {
 150         Platform& platform = Platform::GetInstance();
 151         platform.FreeLibrary(FModule);
 152         FModule = NULL;
 153         UnloadDependencies();
 154         result = true;
 155     }
 156 
 157     return result;
 158 }
 159 
 160 void Library::AddDependency(const TString &FileName) {
 161     InitializeDependencies();
 162 
 163     if (FDependentLibraryNames != NULL) {
 164         FDependentLibraryNames->push_back(FileName);
 165     }
 166 }
 167 
 168 void Library::AddDependencies(const std::vector<TString> &Dependencies) {
 169     if (Dependencies.size() > 0) {
 170         InitializeDependencies();
 171 
 172         if (FDependentLibraryNames != NULL) {
 173             for (std::vector<TString>::const_iterator iterator =
 174                     FDependentLibraryNames->begin();
 175                 iterator != FDependentLibraryNames->end(); iterator++) {
 176                 TString fileName = *iterator;
 177                 AddDependency(fileName);
 178             }
 179         }
 180     }
 181 }