michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * vim: set ts=8 sts=4 et sw=4 tw=99:
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef jit_AsmJSSignalHandlers_h
michael@0: #define jit_AsmJSSignalHandlers_h
michael@0: 
michael@0: struct JSRuntime;
michael@0: 
michael@0: #ifdef XP_MACOSX
michael@0: # include <mach/mach.h>
michael@0: # include "jslock.h"
michael@0: #endif
michael@0: 
michael@0: namespace js {
michael@0: 
michael@0: // Returns whether signal handlers for asm.js and for JitRuntime access
michael@0: // violations have been installed.
michael@0: bool
michael@0: EnsureAsmJSSignalHandlersInstalled(JSRuntime *rt);
michael@0: 
michael@0: // Force any currently-executing asm.js code to call
michael@0: // js::HandleExecutionInterrupt.
michael@0: extern void
michael@0: RequestInterruptForAsmJSCode(JSRuntime *rt);
michael@0: 
michael@0: // On OSX we are forced to use the lower-level Mach exception mechanism instead
michael@0: // of Unix signals. Mach exceptions are not handled on the victim's stack but
michael@0: // rather require an extra thread. For simplicity, we create one such thread
michael@0: // per JSRuntime (upon the first use of asm.js in the JSRuntime). This thread
michael@0: // and related resources are owned by AsmJSMachExceptionHandler which is owned
michael@0: // by JSRuntime.
michael@0: #ifdef XP_MACOSX
michael@0: class AsmJSMachExceptionHandler
michael@0: {
michael@0:     bool installed_;
michael@0:     PRThread *thread_;
michael@0:     mach_port_t port_;
michael@0: 
michael@0:     void uninstall();
michael@0: 
michael@0:   public:
michael@0:     AsmJSMachExceptionHandler();
michael@0:     ~AsmJSMachExceptionHandler() { uninstall(); }
michael@0:     mach_port_t port() const { return port_; }
michael@0:     bool installed() const { return installed_; }
michael@0:     bool install(JSRuntime *rt);
michael@0: };
michael@0: #endif
michael@0: 
michael@0: } // namespace js
michael@0: 
michael@0: #endif // jit_AsmJSSignalHandlers_h