1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/jit/AsmJSSignalHandlers.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,55 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef jit_AsmJSSignalHandlers_h
1.11 +#define jit_AsmJSSignalHandlers_h
1.12 +
1.13 +struct JSRuntime;
1.14 +
1.15 +#ifdef XP_MACOSX
1.16 +# include <mach/mach.h>
1.17 +# include "jslock.h"
1.18 +#endif
1.19 +
1.20 +namespace js {
1.21 +
1.22 +// Returns whether signal handlers for asm.js and for JitRuntime access
1.23 +// violations have been installed.
1.24 +bool
1.25 +EnsureAsmJSSignalHandlersInstalled(JSRuntime *rt);
1.26 +
1.27 +// Force any currently-executing asm.js code to call
1.28 +// js::HandleExecutionInterrupt.
1.29 +extern void
1.30 +RequestInterruptForAsmJSCode(JSRuntime *rt);
1.31 +
1.32 +// On OSX we are forced to use the lower-level Mach exception mechanism instead
1.33 +// of Unix signals. Mach exceptions are not handled on the victim's stack but
1.34 +// rather require an extra thread. For simplicity, we create one such thread
1.35 +// per JSRuntime (upon the first use of asm.js in the JSRuntime). This thread
1.36 +// and related resources are owned by AsmJSMachExceptionHandler which is owned
1.37 +// by JSRuntime.
1.38 +#ifdef XP_MACOSX
1.39 +class AsmJSMachExceptionHandler
1.40 +{
1.41 + bool installed_;
1.42 + PRThread *thread_;
1.43 + mach_port_t port_;
1.44 +
1.45 + void uninstall();
1.46 +
1.47 + public:
1.48 + AsmJSMachExceptionHandler();
1.49 + ~AsmJSMachExceptionHandler() { uninstall(); }
1.50 + mach_port_t port() const { return port_; }
1.51 + bool installed() const { return installed_; }
1.52 + bool install(JSRuntime *rt);
1.53 +};
1.54 +#endif
1.55 +
1.56 +} // namespace js
1.57 +
1.58 +#endif // jit_AsmJSSignalHandlers_h
