namespace llvm {
class StringRef;
+class CrashRecoveryContextCleanup;
+
/// \brief Crash recovery helper object.
///
/// This class implements support for running operations in a safe context so
/// Crash recovery contexts may not be nested.
class CrashRecoveryContext {
void *Impl;
+ CrashRecoveryContextCleanup *head;
public:
- CrashRecoveryContext() : Impl(0) {}
+ CrashRecoveryContext() : Impl(0), head(0) {}
~CrashRecoveryContext();
+
+ void registerCleanup(CrashRecoveryContextCleanup *cleanup);
+ void unregisterCleanup(CrashRecoveryContextCleanup *cleanup);
/// \brief Enable crash recovery.
static void Enable();
/// thread which is in a protected context.
static CrashRecoveryContext *GetCurrent();
+ /// \brief Return true if the current thread is recovering from a
+ /// crash.
+ static bool isRecoveringFromCrash();
+
/// \brief Execute the provide callback function (with the given arguments) in
/// a protected context.
///
/// the backtrace of the crash on failures.
bool RunSafely(void (*Fn)(void*), void *UserData);
+ /// \brief Execute the provide callback function (with the given arguments) in
+ /// a protected context which is run in another thread (optionally with a
+ /// requested stack size).
+ ///
+ /// See RunSafely() and llvm_execute_on_thread().
+ bool RunSafelyOnThread(void (*Fn)(void*), void *UserData,
+ unsigned RequestedStackSize = 0);
+
/// \brief Explicitly trigger a crash recovery in the current process, and
/// return failure from RunSafely(). This function does not return.
void HandleCrash();
const std::string &getBacktrace() const;
};
+class CrashRecoveryContextCleanup {
+protected:
+ CrashRecoveryContext *context;
+ CrashRecoveryContextCleanup(CrashRecoveryContext *context)
+ : context(context), cleanupFired(false) {}
+public:
+ bool cleanupFired;
+
+ virtual ~CrashRecoveryContextCleanup();
+ virtual void recoverResources() = 0;
+
+ CrashRecoveryContext *getContext() const {
+ return context;
+ }
+
+private:
+ friend class CrashRecoveryContext;
+ CrashRecoveryContextCleanup *prev, *next;
+};
+
+template<typename DERIVED, typename T>
+class CrashRecoveryContextCleanupBase : public CrashRecoveryContextCleanup {
+protected:
+ T *resource;
+ CrashRecoveryContextCleanupBase(CrashRecoveryContext *context, T* resource)
+ : CrashRecoveryContextCleanup(context), resource(resource) {}
+public:
+ static DERIVED *create(T *x) {
+ if (x) {
+ if (CrashRecoveryContext *context = CrashRecoveryContext::GetCurrent())
+ return new DERIVED(context, x);
+ }
+ return 0;
+ }
+};
+
+template <typename T>
+class CrashRecoveryContextDestructorCleanup : public
+ CrashRecoveryContextCleanupBase<CrashRecoveryContextDestructorCleanup<T>, T> {
+public:
+ CrashRecoveryContextDestructorCleanup(CrashRecoveryContext *context,
+ T *resource)
+ : CrashRecoveryContextCleanupBase<
+ CrashRecoveryContextDestructorCleanup<T>, T>(context, resource) {}
+
+ virtual void recoverResources() {
+ this->resource->~T();
+ }
+};
+
+template <typename T>
+class CrashRecoveryContextDeleteCleanup : public
+ CrashRecoveryContextCleanupBase<CrashRecoveryContextDeleteCleanup<T>, T> {
+public:
+ CrashRecoveryContextDeleteCleanup(CrashRecoveryContext *context, T *resource)
+ : CrashRecoveryContextCleanupBase<
+ CrashRecoveryContextDeleteCleanup<T>, T>(context, resource) {}
+
+ virtual void recoverResources() {
+ delete this->resource;
+ }
+};
+
+template <typename T>
+class CrashRecoveryContextReleaseRefCleanup : public
+ CrashRecoveryContextCleanupBase<CrashRecoveryContextReleaseRefCleanup<T>, T>
+{
+public:
+ CrashRecoveryContextReleaseRefCleanup(CrashRecoveryContext *context,
+ T *resource)
+ : CrashRecoveryContextCleanupBase<CrashRecoveryContextReleaseRefCleanup<T>,
+ T>(context, resource) {}
+
+ virtual void recoverResources() {
+ this->resource->Release();
+ }
+};
+
+template <typename T, typename Cleanup = CrashRecoveryContextDeleteCleanup<T> >
+class CrashRecoveryContextCleanupRegistrar {
+ CrashRecoveryContextCleanup *cleanup;
+public:
+ CrashRecoveryContextCleanupRegistrar(T *x)
+ : cleanup(Cleanup::create(x)) {
+ if (cleanup)
+ cleanup->getContext()->registerCleanup(cleanup);
+ }
+
+ ~CrashRecoveryContextCleanupRegistrar() {
+ unregister();
+ }
+
+ void unregister() {
+ if (cleanup && !cleanup->cleanupFired)
+ cleanup->getContext()->unregisterCleanup(cleanup);
+ cleanup = 0;
+ }
+};
}
#endif