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// Copyright 2016 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 "components/browser_watcher/stability_debugging.h"
#include <windows.h>
#include <memory>
#include "base/debug/activity_tracker.h"
#include "build/build_config.h"
namespace browser_watcher {
namespace {
struct VehUnregisterer {
void operator()(void* handle) const {
::RemoveVectoredExceptionHandler(handle);
}
};
using VehHandle = std::unique_ptr<void, VehUnregisterer>;
uintptr_t GetProgramCounter(const CONTEXT& context) {
#if defined(ARCH_CPU_X86)
return context.Eip;
#elif defined(ARCH_CPU_X86_64)
return context.Rip;
#endif
}
LONG CALLBACK VectoredExceptionHandler(EXCEPTION_POINTERS* exception_pointers) {
base::debug::GlobalActivityTracker* tracker =
base::debug::GlobalActivityTracker::Get();
if (tracker) {
EXCEPTION_RECORD* record = exception_pointers->ExceptionRecord;
uintptr_t pc = GetProgramCounter(*exception_pointers->ContextRecord);
tracker->RecordException(reinterpret_cast<void*>(pc),
record->ExceptionAddress, record->ExceptionCode);
}
return EXCEPTION_CONTINUE_SEARCH; // Continue to the next handler.
}
} // namespace
void SetStabilityDataBool(base::StringPiece name, bool value) {
base::debug::GlobalActivityTracker* global_tracker =
base::debug::GlobalActivityTracker::Get();
if (!global_tracker)
return; // Activity tracking isn't enabled.
global_tracker->process_data().SetBool(name, value);
}
void SetStabilityDataInt(base::StringPiece name, int64_t value) {
base::debug::GlobalActivityTracker* global_tracker =
base::debug::GlobalActivityTracker::Get();
if (!global_tracker)
return; // Activity tracking isn't enabled.
global_tracker->process_data().SetInt(name, value);
}
void RegisterStabilityVEH() {
#if defined(ADDRESS_SANITIZER)
// ASAN on windows x64 is dynamically allocating the shadow memory on a
// memory access violation by setting up an vector exception handler.
// When instrumented with ASAN, this code may trigger an exception by
// accessing unallocated shadow memory, which is causing an infinite
// recursion (i.e. infinite memory access violation).
(void)&VectoredExceptionHandler;
#else
// Register a vectored exception handler and request it be first. Note that
// subsequent registrations may also request to be first, in which case this
// one will be bumped.
// TODO(manzagop): Depending on observations, it may be necessary to
// consider refreshing the registration, either periodically or at opportune
// (e.g. risky) times.
static VehHandle veh_handler(
::AddVectoredExceptionHandler(1, &VectoredExceptionHandler));
DCHECK(veh_handler);
#endif // ADDRESS_SANITIZER
}
} // namespace browser_watcher
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