Android: Add chrome-specific dynamic linker.

third_party/crazy_linker/crazy_linker/src/crazy_linker_library_view.h

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CRAZY_LINKER_LIBRARY_VIEW_H
+#define CRAZY_LINKER_LIBRARY_VIEW_H
+
+#include "crazy_linker_error.h"
+#include "crazy_linker_util.h"
+
+namespace crazy {
+
+class SharedLibrary;
+
+// A LibraryView is a reference-counted handle to either a
+// crazy::SharedLibrary object or a library handle returned by the system's
+// dlopen() function.
+//
+// It has a name, which is always a base name, because only one
+// library with a given base name can be loaded in the system.
+class LibraryView {
+ public:
+  enum {
+    TYPE_NONE = 0xbaadbaad,
+    TYPE_SYSTEM = 0x2387cef,
+    TYPE_CRAZY = 0xcdef2387,
+  };
+
+  LibraryView()
+      : type_(TYPE_NONE), crazy_(NULL), system_(NULL), name_(), ref_count_(1) {}
+
+  ~LibraryView();
+
+  bool IsSystem() const { return type_ == TYPE_SYSTEM; }
+
+  bool IsCrazy() const { return type_ == TYPE_CRAZY; }
+
+  void SetSystem(void* system_lib, const char* name) {
+    type_ = TYPE_SYSTEM;
+    system_ = system_lib;
+    name_ = name;
+  }
+
+  void SetCrazy(SharedLibrary* crazy_lib, const char* name) {
+    type_ = TYPE_CRAZY;
+    crazy_ = crazy_lib;
+    name_ = name;
+  }
+
+  const char* GetName() { return name_.c_str(); }
+
+  SharedLibrary* GetCrazy() { return IsCrazy() ? crazy_ : NULL; }
+
+  void* GetSystem() { return IsSystem() ? system_ : NULL; }
+
+  void AddRef() { ref_count_++; }
+
+  // Decrement reference count. Returns true iff it reaches 0.
+  // This never destroys the object.
+  bool SafeDecrementRef() { return (--ref_count_ == 0); }
+
+  // Lookup a symbol from this library.
+  // If this is a crazy library, perform a breadth-first search,
+  // for system libraries, use dlsym() instead.
+  void* LookupSymbol(const char* symbol_name);
+
+  // Retrieve library information.
+  bool GetInfo(size_t* load_address,
+               size_t* load_size,
+               size_t* relro_start,
+               size_t* relro_size,
+               Error* error);
+
+  // Only used for debugging.
+  int ref_count() const { return ref_count_; }
+
+ private:
+  uint32_t type_;
+  SharedLibrary* crazy_;
+  void* system_;
+  String name_;
+  int ref_count_;
+};
+
+}  // namespace crazy
+
+#endif  // CRAZY_LINKER_LIBRARY_VIEW_H