81 lines
2.4 KiB
C++
81 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* Copyright 2014 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef wasm_signal_handlers_h
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#define wasm_signal_handlers_h
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#include "mozilla/Attributes.h"
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#if defined(XP_DARWIN)
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# include <mach/mach.h>
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#endif
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#include "threading/Thread.h"
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struct JSRuntime;
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namespace js {
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// Force any currently-executing asm.js/ion code to call HandleExecutionInterrupt.
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extern void
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InterruptRunningJitCode(JSRuntime* rt);
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namespace wasm {
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// Ensure the given JSRuntime is set up to use signals. Failure to enable signal
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// handlers indicates some catastrophic failure and creation of the runtime must
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// fail.
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MOZ_MUST_USE bool
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EnsureSignalHandlers(JSRuntime* rt);
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// Return whether signals can be used in this process for interrupts or
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// asm.js/wasm out-of-bounds.
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bool
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HaveSignalHandlers();
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#if defined(XP_DARWIN)
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// On OSX we are forced to use the lower-level Mach exception mechanism instead
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// of Unix signals. Mach exceptions are not handled on the victim's stack but
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// rather require an extra thread. For simplicity, we create one such thread
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// per JSRuntime (upon the first use of asm.js in the JSRuntime). This thread
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// and related resources are owned by AsmJSMachExceptionHandler which is owned
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// by JSRuntime.
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class MachExceptionHandler
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{
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bool installed_;
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js::Thread thread_;
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mach_port_t port_;
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void uninstall();
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public:
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MachExceptionHandler();
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~MachExceptionHandler() { uninstall(); }
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mach_port_t port() const { return port_; }
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bool installed() const { return installed_; }
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bool install(JSRuntime* rt);
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};
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#endif
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// Test whether the given PC is within the innermost wasm activation. Return
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// false if it is not, or it cannot be determined.
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bool IsPCInWasmCode(void *pc);
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} // namespace wasm
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} // namespace js
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#endif // wasm_signal_handlers_h
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