From fbaf0bb26397aa498eb9156f06d5a6fe34dd7dd8 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 03:14:29 +0200 Subject: Merging upstream version 125.0.1. Signed-off-by: Daniel Baumann --- js/src/jit/PcScriptCache.h | 88 ---------------------------------------------- 1 file changed, 88 deletions(-) delete mode 100644 js/src/jit/PcScriptCache.h (limited to 'js/src/jit/PcScriptCache.h') diff --git a/js/src/jit/PcScriptCache.h b/js/src/jit/PcScriptCache.h deleted file mode 100644 index c83c479c85..0000000000 --- a/js/src/jit/PcScriptCache.h +++ /dev/null @@ -1,88 +0,0 @@ -/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- - * vim: set ts=8 sts=2 et sw=2 tw=80: - * This Source Code Form is subject to the terms of the Mozilla Public - * License, v. 2.0. If a copy of the MPL was not distributed with this - * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ - -#ifndef jit_PcScriptCache_h -#define jit_PcScriptCache_h - -#include "mozilla/Array.h" -#include "js/TypeDecls.h" -#include "vm/Runtime.h" - -// Defines a fixed-size hash table solely for the purpose of caching -// jit::GetPcScript(). One cache is attached to each JSRuntime; it functions as -// if cleared on GC. - -namespace js { -namespace jit { - -struct PcScriptCacheEntry { - uint8_t* returnAddress; // Key into the hash table. - jsbytecode* pc; // Cached PC. - JSScript* script; // Cached script. -}; - -struct PcScriptCache { - private: - static const uint32_t Length = 73; - - // GC number at the time the cache was filled or created. - // Storing and checking against this number allows us to not bother - // clearing this cache on every GC -- only when actually necessary. - uint64_t gcNumber; - - // List of cache entries. - mozilla::Array entries; - - public: - explicit PcScriptCache(uint64_t gcNumber) { clear(gcNumber); } - - void clear(uint64_t gcNumber) { - for (uint32_t i = 0; i < Length; i++) { - entries[i].returnAddress = nullptr; - } - this->gcNumber = gcNumber; - } - - // Get a value from the cache. May perform lazy allocation. - [[nodiscard]] bool get(JSRuntime* rt, uint32_t hash, uint8_t* addr, - JSScript** scriptRes, jsbytecode** pcRes) { - // If a GC occurred, lazily clear the cache now. - if (gcNumber != rt->gc.gcNumber()) { - clear(rt->gc.gcNumber()); - return false; - } - - if (entries[hash].returnAddress != addr) { - return false; - } - - *scriptRes = entries[hash].script; - if (pcRes) { - *pcRes = entries[hash].pc; - } - - return true; - } - - void add(uint32_t hash, uint8_t* addr, jsbytecode* pc, JSScript* script) { - MOZ_ASSERT(addr); - MOZ_ASSERT(pc); - MOZ_ASSERT(script); - entries[hash].returnAddress = addr; - entries[hash].pc = pc; - entries[hash].script = script; - } - - static uint32_t Hash(uint8_t* addr) { - uint32_t key = (uint32_t)((uintptr_t)addr); - return ((key >> 3) * 2654435761u) % Length; - } -}; - -} // namespace jit -} // namespace js - -#endif /* jit_PcScriptCache_h */ -- cgit v1.2.3