The Tor Browser: js/src/jit/AsmJSSignalHandlers.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-

     2  * vim: set ts=8 sts=4 et sw=4 tw=99:

     3  * This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #ifndef jit_AsmJSSignalHandlers_h

     8 #define jit_AsmJSSignalHandlers_h

    10 struct JSRuntime;

    12 #ifdef XP_MACOSX

    13 # include <mach/mach.h>

    14 # include "jslock.h"

    15 #endif

    17 namespace js {

    19 // Returns whether signal handlers for asm.js and for JitRuntime access

    20 // violations have been installed.

    21 bool

    22 EnsureAsmJSSignalHandlersInstalled(JSRuntime *rt);

    24 // Force any currently-executing asm.js code to call

    25 // js::HandleExecutionInterrupt.

    26 extern void

    27 RequestInterruptForAsmJSCode(JSRuntime *rt);

    29 // On OSX we are forced to use the lower-level Mach exception mechanism instead

    30 // of Unix signals. Mach exceptions are not handled on the victim's stack but

    31 // rather require an extra thread. For simplicity, we create one such thread

    32 // per JSRuntime (upon the first use of asm.js in the JSRuntime). This thread

    33 // and related resources are owned by AsmJSMachExceptionHandler which is owned

    34 // by JSRuntime.

    35 #ifdef XP_MACOSX

    36 class AsmJSMachExceptionHandler

    37 {

    38     bool installed_;

    39     PRThread *thread_;

    40     mach_port_t port_;

    42     void uninstall();

    44   public:

    45     AsmJSMachExceptionHandler();

    46     ~AsmJSMachExceptionHandler() { uninstall(); }

    47     mach_port_t port() const { return port_; }

    48     bool installed() const { return installed_; }

    49     bool install(JSRuntime *rt);

    50 };

    51 #endif

    53 } // namespace js

    55 #endif // jit_AsmJSSignalHandlers_h

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