#ifndef LLVM_SUPPORT_CRASHRECOVERYCONTEXT_H
#define LLVM_SUPPORT_CRASHRECOVERYCONTEXT_H
+#include "llvm/ADT/STLExtras.h"
#include <string>
namespace llvm {
-class StringRef;
-
class CrashRecoveryContextCleanup;
-
+
/// \brief Crash recovery helper object.
///
/// This class implements support for running operations in a safe context so
///
/// ... no crash was detected ...
/// }
-///
-/// Crash recovery contexts may not be nested.
class CrashRecoveryContext {
void *Impl;
CrashRecoveryContextCleanup *head;
public:
- CrashRecoveryContext() : Impl(0), head(0) {}
+ CrashRecoveryContext() : Impl(nullptr), head(nullptr) {}
~CrashRecoveryContext();
-
+
void registerCleanup(CrashRecoveryContextCleanup *cleanup);
void unregisterCleanup(CrashRecoveryContextCleanup *cleanup);
/// 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.
///
/// make as little assumptions as possible about the program state when
/// RunSafely has returned false. Clients can use getBacktrace() to retrieve
/// the backtrace of the crash on failures.
- bool RunSafely(void (*Fn)(void*), void *UserData);
+ bool RunSafely(function_ref<void()> Fn);
+ bool RunSafely(void (*Fn)(void*), void *UserData) {
+ return RunSafely([&]() { Fn(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().
+ ///
+ /// On Darwin, if PRIO_DARWIN_BG is set on the calling thread, it will be
+ /// propagated to the new thread as well.
+ bool RunSafelyOnThread(function_ref<void()>, unsigned RequestedStackSize = 0);
bool RunSafelyOnThread(void (*Fn)(void*), void *UserData,
- unsigned RequestedStackSize = 0);
+ unsigned RequestedStackSize = 0) {
+ return RunSafelyOnThread([&]() { Fn(UserData); }, RequestedStackSize);
+ }
/// \brief Explicitly trigger a crash recovery in the current process, and
/// return failure from RunSafely(). This function does not return.
};
class CrashRecoveryContextCleanup {
+protected:
+ CrashRecoveryContext *context;
+ CrashRecoveryContextCleanup(CrashRecoveryContext *context)
+ : context(context), cleanupFired(false) {}
+
public:
bool cleanupFired;
- enum ProvidedCleanups { DeleteCleanup, DestructorCleanup };
-
- CrashRecoveryContextCleanup() : cleanupFired(false) {}
+
virtual ~CrashRecoveryContextCleanup();
virtual void recoverResources() = 0;
-
- template <typename T> static CrashRecoveryContextCleanup *create(T *,
- ProvidedCleanups cleanupKind =
- CrashRecoveryContextCleanup::DeleteCleanup);
-
+
+ CrashRecoveryContext *getContext() const {
+ return context;
+ }
+
private:
friend class CrashRecoveryContext;
CrashRecoveryContextCleanup *prev, *next;
};
-template <typename T>
-class CrashRecoveryContextDestructorCleanup
- : public CrashRecoveryContextCleanup
-{
+template<typename DERIVED, typename T>
+class CrashRecoveryContextCleanupBase : public CrashRecoveryContextCleanup {
+protected:
T *resource;
+ CrashRecoveryContextCleanupBase(CrashRecoveryContext *context, T *resource)
+ : CrashRecoveryContextCleanup(context), resource(resource) {}
+
public:
- CrashRecoveryContextDestructorCleanup(T *resource) : resource(resource) {}
- virtual void recoverResources() {
- resource->~T();
+ static DERIVED *create(T *x) {
+ if (x) {
+ if (CrashRecoveryContext *context = CrashRecoveryContext::GetCurrent())
+ return new DERIVED(context, x);
+ }
+ return nullptr;
}
};
template <typename T>
-class CrashRecoveryContextDeleteCleanup
- : public CrashRecoveryContextCleanup
-{
- T *resource;
+class CrashRecoveryContextDestructorCleanup : public
+ CrashRecoveryContextCleanupBase<CrashRecoveryContextDestructorCleanup<T>, T> {
public:
- CrashRecoveryContextDeleteCleanup(T *resource) : resource(resource) {}
+ CrashRecoveryContextDestructorCleanup(CrashRecoveryContext *context,
+ T *resource)
+ : CrashRecoveryContextCleanupBase<
+ CrashRecoveryContextDestructorCleanup<T>, T>(context, resource) {}
+
virtual void recoverResources() {
- delete resource;
+ this->resource->~T();
}
};
template <typename T>
-struct CrashRecoveryContextTrait {
- static inline CrashRecoveryContextCleanup *
- createCleanup(T *resource,
- CrashRecoveryContextCleanup::ProvidedCleanups cleanup) {
- switch (cleanup) {
- case CrashRecoveryContextCleanup::DeleteCleanup:
- return new CrashRecoveryContextDeleteCleanup<T>(resource);
- case CrashRecoveryContextCleanup::DestructorCleanup:
- return new CrashRecoveryContextDestructorCleanup<T>(resource);
- }
- return 0;
- }
+class CrashRecoveryContextDeleteCleanup : public
+ CrashRecoveryContextCleanupBase<CrashRecoveryContextDeleteCleanup<T>, T> {
+public:
+ CrashRecoveryContextDeleteCleanup(CrashRecoveryContext *context, T *resource)
+ : CrashRecoveryContextCleanupBase<
+ CrashRecoveryContextDeleteCleanup<T>, T>(context, resource) {}
+
+ void recoverResources() override { delete this->resource; }
};
-template<typename T>
-inline CrashRecoveryContextCleanup*
-CrashRecoveryContextCleanup::create(T *x,
- CrashRecoveryContextCleanup::ProvidedCleanups cleanupKind) {
- return CrashRecoveryContext::GetCurrent() ?
- CrashRecoveryContextTrait<T>::createCleanup(x, cleanupKind) :
- 0;
-}
+template <typename T>
+class CrashRecoveryContextReleaseRefCleanup : public
+ CrashRecoveryContextCleanupBase<CrashRecoveryContextReleaseRefCleanup<T>, T>
+{
+public:
+ CrashRecoveryContextReleaseRefCleanup(CrashRecoveryContext *context,
+ T *resource)
+ : CrashRecoveryContextCleanupBase<CrashRecoveryContextReleaseRefCleanup<T>,
+ T>(context, resource) {}
+
+ void recoverResources() override { this->resource->Release(); }
+};
+template <typename T, typename Cleanup = CrashRecoveryContextDeleteCleanup<T> >
class CrashRecoveryContextCleanupRegistrar {
- CrashRecoveryContext *context;
CrashRecoveryContextCleanup *cleanup;
+
public:
- CrashRecoveryContextCleanupRegistrar(CrashRecoveryContextCleanup *cleanup)
- : context(CrashRecoveryContext::GetCurrent()),
- cleanup(cleanup)
- {
- if (context && cleanup)
- context->registerCleanup(cleanup);
+ CrashRecoveryContextCleanupRegistrar(T *x)
+ : cleanup(Cleanup::create(x)) {
+ if (cleanup)
+ cleanup->getContext()->registerCleanup(cleanup);
}
- ~CrashRecoveryContextCleanupRegistrar() {
- if (cleanup && !cleanup->cleanupFired) {
- if (context)
- context->unregisterCleanup(cleanup);
- else
- delete cleanup;
- }
+
+ ~CrashRecoveryContextCleanupRegistrar() { unregister(); }
+
+ void unregister() {
+ if (cleanup && !cleanup->cleanupFired)
+ cleanup->getContext()->unregisterCleanup(cleanup);
+ cleanup = nullptr;
}
};
-}
+} // end namespace llvm
-#endif
+#endif // LLVM_SUPPORT_CRASHRECOVERYCONTEXT_H
projects / oota-llvm.git / blobdiff