handler-outside-win.cc

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// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
// PLEASE READ BEFORE CHANGING THIS FILE!
//
// This file implements the support code for the out of bounds trap handler.
// Nothing in here actually runs in the trap handler, but the code here
// manipulates data structures used by the trap handler so we still need to be
// careful. In order to minimize this risk, here are some rules to follow.
//
// 1. Avoid introducing new external dependencies. The files in src/trap-handler
//    should be as self-contained as possible to make it easy to audit the code.
//
// 2. Any changes must be reviewed by someone from the crash reporting
//    or security team. Se OWNERS for suggested reviewers.
//
// For more information, see https://goo.gl/yMeyUY.
//
// For the code that runs in the trap handler itself, see handler-inside.cc.
 
#include <windows.h>
 
#include "src/trap-handler/handler-inside-win.h"
#include "src/trap-handler/trap-handler.h"
 
namespace v8 {
namespace internal {
namespace trap_handler {
 
#if V8_TRAP_HANDLER_SUPPORTED
 
namespace {
 
// A handle to our registered exception handler, so that we can remove it
// again later.
void* g_registered_handler = nullptr;
 
}  // namespace
 
bool RegisterDefaultTrapHandler() {
  constexpr ULONG first = TRUE;
  TH_CHECK(g_registered_handler == nullptr);
  g_registered_handler = AddVectoredExceptionHandler(first, HandleWasmTrap);
 
  return nullptr != g_registered_handler;
}
 
void RemoveTrapHandler() {
  if (!g_registered_handler) return;
 
  RemoveVectoredExceptionHandler(g_registered_handler);
  g_registered_handler = nullptr;
}
 
#endif  // V8_TRAP_HANDLER_SUPPORTED
 
}  // namespace trap_handler
}  // namespace internal
}  // namespace v8