| /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| * vim: set ts=8 sts=4 et sw=4 tw=99: |
| * |
| * Copyright 2014 Mozilla Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef asmjs_AsmJSSignalHandlers_h |
| #define asmjs_AsmJSSignalHandlers_h |
| |
| #if defined(XP_DARWIN) && defined(ASMJS_MAY_USE_SIGNAL_HANDLERS_FOR_OOB) |
| # include <mach/mach.h> |
| # include "jslock.h" |
| #endif |
| |
| struct JSRuntime; |
| |
| namespace js { |
| |
| // Set up any signal/exception handlers needed to execute code in the given |
| // runtime. Return whether runtime can: |
| // - rely on fault handler support for avoiding asm.js heap bounds checks |
| // - rely on InterruptRunningJitCode to halt running Ion/asm.js from any thread |
| bool |
| EnsureSignalHandlersInstalled(JSRuntime* rt); |
| |
| // Force any currently-executing asm.js code to call HandleExecutionInterrupt. |
| extern void |
| InterruptRunningJitCode(JSRuntime* rt); |
| |
| #if defined(XP_DARWIN) && defined(ASMJS_MAY_USE_SIGNAL_HANDLERS_FOR_OOB) |
| // On OSX we are forced to use the lower-level Mach exception mechanism instead |
| // of Unix signals. Mach exceptions are not handled on the victim's stack but |
| // rather require an extra thread. For simplicity, we create one such thread |
| // per JSRuntime (upon the first use of asm.js in the JSRuntime). This thread |
| // and related resources are owned by AsmJSMachExceptionHandler which is owned |
| // by JSRuntime. |
| class AsmJSMachExceptionHandler |
| { |
| bool installed_; |
| PRThread* thread_; |
| mach_port_t port_; |
| |
| void uninstall(); |
| |
| public: |
| AsmJSMachExceptionHandler(); |
| ~AsmJSMachExceptionHandler() { uninstall(); } |
| mach_port_t port() const { return port_; } |
| bool installed() const { return installed_; } |
| bool install(JSRuntime* rt); |
| }; |
| #endif |
| |
| } // namespace js |
| |
| #endif // asmjs_AsmJSSignalHandlers_h |