Remove Chrome Frame code and resources.

chrome_frame/function_stub.h

-// Copyright (c) 2010 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 CHROME_FRAME_FUNCTION_STUB_H_
-#define CHROME_FRAME_FUNCTION_STUB_H_
-
-#include <windows.h>
-
-#include "base/basictypes.h"
-
-// IMPORTANT: The struct below must be byte aligned.
-#pragma pack(push)
-#pragma pack(1)
-
-struct FunctionStubAsm {
-  // The stub always starts with an indirect jump, which starts out jumping
-  // to the remainder of the stub. This means we can bypass the stub by
-  // rewriting the jump destination, which is data, in a manner that does
-  // not involve writing code, only writing data at a natural word boundary.
-  uint16 jump_to_bypass_;        // indirect jump
-  uintptr_t bypass_target_addr_; // to the bypass target.
-  uint8 pop_return_addr_;        // pop eax
-  uint16 push_;                  // push [arg]   ; push...
-  uintptr_t arg_addr_;           //              ; extra argument
-  uint8 push_return_addr_;       // push eax     ; push the return address
-  uint16 jump_to_target;         // jmp [target] ; jump...
-  uintptr_t target_addr_;        //              ; to the hook function
-};
-
-#pragma pack(pop)
-
-
-#ifndef _M_IX86
-#error Only x86 supported right now.
-#endif
-
-// This struct is assembly code + signature.  The purpose of the struct is to be
-// able to hook an existing function with our own and store information such
-// as the original function pointer with the code stub.  Typically this is used
-// for patching entries of a vtable or e.g. a globally registered wndproc
-// for a class as opposed to a window.
-// When unhooking, you can just call the BypassStub() function and leave the
-// stub in memory.  This unhooks your function while leaving the (potential)
-// chain of patches intact.
-//
-// @note: This class is meant for __stdcall calling convention and
-//        it uses eax as a temporary variable.  The struct can
-//        be improved in the future to save eax before the
-//        operation and then restore it.
-//
-// For instance if the function prototype is:
-//
-// @code
-//   LRESULT WndProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam);
-// @endcode
-//
-// and we would like to add one static argument to make it, say:
-//
-// @code
-//   LRESULT MyNewWndProc(WNDPROC original, HWND hwnd, UINT msg,
-//                        WPARAM wparam, LPARAM lparam);
-// @endcode
-//
-// That can be achieved by wrapping the function up with a FunctionStub:
-//
-// @code
-//   FunctionStub* stub = FunctionStub::Create(original_wndproc, MyNewWndProc);
-//   SetClassLongPtr(wnd, GCLP_WNDPROC, stub->code());
-// @endcode
-struct FunctionStub {
- public:
-  // Neutralizes this stub and converts it to a direct jump to a new target.
-  void BypassStub(void* new_target);
-
-  inline bool is_bypassed() const {
-    return bypass_address_ !=
-        reinterpret_cast<uintptr_t>(&stub_.pop_return_addr_);
-  }
-
-  // Returns true if the stub is valid and enabled.
-  // Don't call this method after bypassing the stub.
-  bool is_valid() const;
-
-  inline PROC code() const {
-    return reinterpret_cast<PROC>(const_cast<FunctionStubAsm*>(&stub_));
-  }
-
-  // Use to create a new function stub as shown above.
-  // @param extra_argument The static argument to pass to the function.
-  // @param dest Target function to which the stub applies.
-  // @returns NULL if an error occurs, otherwise a pointer to the
-  //    function stub.
-  static FunctionStub* Create(uintptr_t extra_argument, void* dest);
-
-  // Test whether address (likely) points to an existing function stub.
-  // @returns NULL if address does not point to a function stub.
-  // @note likely means approximately 1/2^48 here.
-  static FunctionStub* FromCode(void* address);
-
-  // Deallocates a FunctionStub.
-  // The stub must not be in use on any thread!
-  static bool Destroy(FunctionStub* stub);
-
-  // Accessors.
-  uintptr_t argument() const { return argument_; }
-  void set_argument(uintptr_t argument) { argument_ = argument; }
-
-  uintptr_t bypass_address() const { return bypass_address_; }
-  void set_bypass_address(uintptr_t bypass_address) {
-    bypass_address_ = bypass_address;
-  }
-
-  uintptr_t destination_function() const { return destination_function_; }
-  void set_destination_function(uintptr_t destination_function) {
-    destination_function_ = destination_function;
-  }
-
- protected:
-  // Protected for testing only.
-  FunctionStub(uintptr_t extra_argument, void* dest);
-  ~FunctionStub();
-
-  void Init(FunctionStubAsm* stub);
-
-  FunctionStubAsm stub_;
-
-  // Used to identify function stubs that belong to this module.
-  HMODULE signature_;
-
-  // This is the argument value that gets passed to the destination_function_.
-  uintptr_t argument_;
-  // Bypass address, if this is the address of the pop_return_addr_, the
-  // function stub is not bypassed.
-  uintptr_t bypass_address_;
-  // The destination function we dispatch to, not used if the stub
-  // is bypassed.
-  uintptr_t destination_function_;
-};
-
-#endif  // CHROME_FRAME_FUNCTION_STUB_H_