Remove Chrome Frame code and resources.

chrome_frame/function_stub.cc

-// Copyright (c) 2009 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.
-
-#include "chrome_frame/function_stub.h"
-
-#include <new>
-
-#include "base/synchronization/lock.h"
-#include "base/logging.h"
-
-#ifndef _M_IX86
-#error Only x86 supported right now.
-#endif
-
-namespace {
-typedef enum AsmConstants {
-  POP_EAX = 0x58,
-  PUSH_IND = 0x35ff,
-  PUSH_EAX = 0x50,
-  JUMP_IND = 0x25ff,
-};
-
-// A quick and dirty wrapper class that allows us to defer allocating
-// the executable heap until first use, and to release it teardown.
-class ExecutableHeap {
- public:
-  ExecutableHeap() : heap_(NULL) {
-  }
-
-  ~ExecutableHeap() {
-    if (heap_ != NULL) {
-      BOOL ret = ::HeapDestroy(heap_);
-      heap_ = NULL;
-    }
-  }
-
-  void* Allocate(size_t size) {
-    if (!heap_)
-      CreateHeap();
-
-    DCHECK(heap_);
-
-    return ::HeapAlloc(heap_, 0, size);
-  }
-
-  void Free(void* ptr) {
-    DCHECK(heap_ != NULL);
-    ::HeapFree(heap_, 0, ptr);
-  }
-
-  void CreateHeap() {
-    base::AutoLock lock(init_lock_);
-
-    if (heap_ == NULL)
-      heap_ = ::HeapCreate(HEAP_CREATE_ENABLE_EXECUTE, 0, 0);
-  }
-
- private:
-  base::Lock init_lock_;
-  HANDLE heap_;
-};
-
-// Our executable heap instance, all stubs are allocated from here.
-ExecutableHeap heap_;
-
-}  // namespace
-
-extern "C" IMAGE_DOS_HEADER __ImageBase;
-
-bool FunctionStub::is_valid() const {
-  return signature_ == reinterpret_cast<HMODULE>(&__ImageBase) &&
-      !is_bypassed();
-}
-
-FunctionStub::FunctionStub(uintptr_t extra_argument, void* dest)
-    : signature_(reinterpret_cast<HMODULE>(&__ImageBase)),
-      argument_(extra_argument),
-      destination_function_(reinterpret_cast<uintptr_t>(dest)) {
-  bypass_address_ = reinterpret_cast<uintptr_t>(&stub_.pop_return_addr_);
-  Init(&stub_);
-}
-
-FunctionStub::~FunctionStub() {
-}
-
-void FunctionStub::Init(FunctionStubAsm* stub) {
-  DCHECK(stub != NULL);
-
-  stub->jump_to_bypass_ = JUMP_IND;
-  stub->bypass_target_addr_ = reinterpret_cast<uintptr_t>(&bypass_address_);
-  stub->pop_return_addr_ = POP_EAX;
-  stub->push_ = PUSH_IND;
-  stub->arg_addr_ = reinterpret_cast<uintptr_t>(&argument_);
-  stub->push_return_addr_ = PUSH_EAX;
-  stub->jump_to_target = JUMP_IND;
-  stub->target_addr_ = reinterpret_cast<uintptr_t>(&destination_function_);
-
-  // Flush the instruction cache for the newly written code.
-  BOOL ret = ::FlushInstructionCache(::GetCurrentProcess(),
-                                     stub,
-                                     sizeof(*stub));
-}
-
-void FunctionStub::BypassStub(void* new_target) {
-  set_bypass_address(reinterpret_cast<uintptr_t>(new_target));
-}
-
-FunctionStub* FunctionStub::Create(uintptr_t extra_argument, void* dest) {
-  DCHECK(dest);
-  FunctionStub* stub =
-      reinterpret_cast<FunctionStub*>(heap_.Allocate(sizeof(FunctionStub)));
-
-  if (stub != NULL)
-    new (stub) FunctionStub(extra_argument, dest);
-
-  return stub;
-}
-
-FunctionStub* FunctionStub::FromCode(void* address) {
-  // Address points to arbitrary code here, which may e.g.
-  // lie at the end of an executable segment, which in turn
-  // may terminate earlier than the last address we probe.
-  // We therefore execute under an SEH, so as not to crash
-  // on failed probes.
-  __try {
-    // Retrieve the candidata function stub.
-    FunctionStub* candidate = CONTAINING_RECORD(address, FunctionStub, stub_);
-    if (candidate->stub_.jump_to_bypass_ == JUMP_IND &&
-        candidate->signature_ == reinterpret_cast<HMODULE>(&__ImageBase)) {
-      return candidate;
-    }
-  } __except(EXCEPTION_EXECUTE_HANDLER) {
-  }
-
-  return NULL;
-}
-
-bool FunctionStub::Destroy(FunctionStub* stub) {
-  heap_.Free(stub);
-
-  return true;
-}