зеркало из https://github.com/mozilla/gecko-dev.git
85 строки
2.7 KiB
C++
85 строки
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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/**
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* Embedding-provided build ID information, used by SpiderMonkey to tag cached
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* compilation data so that cached data can be reused when possible, or
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* discarded and regenerated if necessary.
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*/
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#ifndef js_BuildId_h
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#define js_BuildId_h
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#include "mozilla/Attributes.h" // MOZ_MUST_USE
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#include "jstypes.h" // JS_PUBLIC_API
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#include "js/Vector.h" // js::Vector
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namespace js {
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class SystemAllocPolicy;
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} // namespace js
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namespace JS {
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/** Vector of characters used for holding build ids. */
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using BuildIdCharVector = js::Vector<char, 0, js::SystemAllocPolicy>;
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/**
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* Return the buildId (represented as a sequence of characters) associated with
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* the currently-executing build. If the JS engine is embedded such that a
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* single cache entry can be observed by different compiled versions of the JS
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* engine, it is critical that the buildId shall change for each new build of
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* the JS engine.
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*/
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using BuildIdOp = bool (*)(BuildIdCharVector* buildId);
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/**
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* Embedder hook to set the buildId-generating function.
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*/
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extern JS_PUBLIC_API void SetProcessBuildIdOp(BuildIdOp buildIdOp);
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/**
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* Some cached data is, in addition to being build-specific, CPU-specific: the
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* cached data depends on CPU features like a particular level of SSE support.
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*
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* This function produces a buildId that includes:
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*
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* * the buildId defined by the embedder-provided BuildIdOp set by
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* JS::SetProcessBuildIdOp, and
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* * CPU feature information for the current CPU.
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*
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* Embedders may use this function to tag cached data whose validity depends
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* on having consistent buildId *and* on the CPU supporting features identical
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* to those in play when the cached data was computed.
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*/
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extern MOZ_MUST_USE JS_PUBLIC_API bool GetOptimizedEncodingBuildId(
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BuildIdCharVector* buildId);
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/**
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* Script bytecode is dependent on the buildId and a few other things.
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*
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* This function produces a buildId that includes:
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*
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* * The buildId defined by the embedder-provided BuildIdOp set by
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* JS::SetProcessBuildIdOp.
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* * Additional bytes describing things like endianness, pointer size and
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* other state XDR buffers depend on.
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*
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* Note: this value may depend on runtime preferences so isn't guaranteed to be
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* stable across restarts.
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*
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* Embedders should use this function to tag transcoded bytecode.
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* See Transcoding.h.
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*/
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extern MOZ_MUST_USE JS_PUBLIC_API bool GetScriptTranscodingBuildId(
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BuildIdCharVector* buildId);
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} // namespace JS
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#endif /* js_BuildId_h */
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