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127 lines
4.2 KiB
C++
127 lines
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: set ts=8 sts=2 et sw=2 tw=80:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* JavaScript API. */
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#ifndef js_Context_h
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#define js_Context_h
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#include "jspubtd.h"
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// [SMDOC] Nested Thread Data Structures (JSContext, JSRuntime)
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//
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// Spidermonkey has two nested data structures for representing threads,
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// JSContext and JSRuntime. All JS threads are represented by a context.
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// Contexts can contain runtimes. A runtime however is not present for
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// all threads. Threads also interact with the GC. See "Nested GC
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// DataStructures" for more info.
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//
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// Context
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// -------
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// JSContext represents a thread: there must be exactly one JSContext for each
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// thread running JS/Wasm.
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//
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// Runtime
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// -------
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// JSRuntime is very similar to JSContext: each runtime belongs to one context
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// (thread), but helper threads don't have their own runtimes (they're shared by
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// all runtimes in the process and use the runtime of the task they're
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// executing).
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//
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// Note:
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// Locking, contexts, and memory allocation.
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//
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// It is important that SpiderMonkey be initialized, and the first context
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// be created, in a single-threaded fashion. Otherwise the behavior of the
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// library is undefined.
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// See:
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// https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey/JSAPI_reference
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// Create a new context (and runtime) for this thread.
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extern JS_PUBLIC_API JSContext* JS_NewContext(
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uint32_t maxbytes, JSRuntime* parentRuntime = nullptr);
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// Destroy a context allocated with JS_NewContext. Must be called on the thread
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// that called JS_NewContext.
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extern JS_PUBLIC_API void JS_DestroyContext(JSContext* cx);
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JS_PUBLIC_API void* JS_GetContextPrivate(JSContext* cx);
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JS_PUBLIC_API void JS_SetContextPrivate(JSContext* cx, void* data);
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extern JS_PUBLIC_API JSRuntime* JS_GetParentRuntime(JSContext* cx);
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extern JS_PUBLIC_API JSRuntime* JS_GetRuntime(JSContext* cx);
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extern JS_PUBLIC_API void JS_SetFutexCanWait(JSContext* cx);
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namespace js {
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void AssertHeapIsIdle();
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} /* namespace js */
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namespace JS {
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/**
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* Asserts (in debug and release builds) that `obj` belongs to the current
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* thread's context.
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*/
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JS_PUBLIC_API void AssertObjectBelongsToCurrentThread(JSObject* obj);
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/**
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* Install a process-wide callback to validate script filenames. The JS engine
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* will invoke this callback for each JS script it parses or XDR decodes.
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*
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* If the callback returns |false|, an exception is thrown and parsing/decoding
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* will be aborted.
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*
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* See also CompileOptions::setSkipFilenameValidation to opt-out of the callback
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* for specific parse jobs.
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*/
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using FilenameValidationCallback = bool (*)(JSContext* cx,
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const char* filename);
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JS_PUBLIC_API void SetFilenameValidationCallback(FilenameValidationCallback cb);
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/**
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* Install an context wide callback that implements the ECMA262 specification
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* host hook `HostEnsureCanAddPrivateElement`.
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*
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* This hook, which should only be overriden for Web Browsers, examines the
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* provided object to determine if the addition of a private field is allowed,
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* throwing an exception and returning false if not.
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*
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* The default implementation of this hook, which will be used unless overriden,
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* examines only proxy objects, and throws if the proxy handler returns true
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* from the handler method `throwOnPrivateField()`.
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*/
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using EnsureCanAddPrivateElementOp = bool (*)(JSContext* cx, HandleValue val);
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JS_PUBLIC_API void SetHostEnsureCanAddPrivateElementHook(
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JSContext* cx, EnsureCanAddPrivateElementOp op);
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/**
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* Transition the cx to a mode where failures that would normally cause a false
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* return value will instead crash with a diagnostic assertion.
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*
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* Return value: the former brittle mode setting.
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*/
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JS_PUBLIC_API bool SetBrittleMode(JSContext* cx, bool setting);
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class AutoBrittleMode {
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bool wasBrittle;
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JSContext* cx;
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public:
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explicit AutoBrittleMode(JSContext* cx) : cx(cx) {
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wasBrittle = SetBrittleMode(cx, true);
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}
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~AutoBrittleMode() { MOZ_ALWAYS_TRUE(SetBrittleMode(cx, wasBrittle)); }
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};
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} /* namespace JS */
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#endif // js_Context_h
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