| /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| * vim: set ts=8 sts=4 et sw=4 tw=99: |
| * 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_ICStubSpace_h |
| #define jit_ICStubSpace_h |
| |
| #include "ds/LifoAlloc.h" |
| |
| namespace js { |
| namespace jit { |
| |
| // ICStubSpace is an abstraction for allocation policy and storage for stub data. |
| // There are two kinds of stubs: optimized stubs and fallback stubs (the latter |
| // also includes stubs that can make non-tail calls that can GC). |
| // |
| // Optimized stubs are allocated per-compartment and are always purged when |
| // JIT-code is discarded. Fallback stubs are allocated per BaselineScript and |
| // are only destroyed when the BaselineScript is destroyed. |
| class ICStubSpace |
| { |
| protected: |
| LifoAlloc allocator_; |
| |
| explicit ICStubSpace(size_t chunkSize) |
| : allocator_(chunkSize) |
| {} |
| |
| public: |
| inline void* alloc(size_t size) { |
| return allocator_.alloc(size); |
| } |
| |
| JS_DECLARE_NEW_METHODS(allocate, alloc, inline) |
| |
| size_t sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const { |
| return allocator_.sizeOfExcludingThis(mallocSizeOf); |
| } |
| }; |
| |
| // Space for optimized stubs. Every JitCompartment has a single |
| // OptimizedICStubSpace. |
| struct OptimizedICStubSpace : public ICStubSpace |
| { |
| static const size_t STUB_DEFAULT_CHUNK_SIZE = 4 * 1024; |
| |
| public: |
| OptimizedICStubSpace() |
| : ICStubSpace(STUB_DEFAULT_CHUNK_SIZE) |
| {} |
| |
| void free() { |
| allocator_.freeAll(); |
| } |
| }; |
| |
| // Space for fallback stubs. Every BaselineScript has a |
| // FallbackICStubSpace. |
| struct FallbackICStubSpace : public ICStubSpace |
| { |
| static const size_t STUB_DEFAULT_CHUNK_SIZE = 256; |
| |
| public: |
| FallbackICStubSpace() |
| : ICStubSpace(STUB_DEFAULT_CHUNK_SIZE) |
| {} |
| |
| inline void adoptFrom(FallbackICStubSpace* other) { |
| allocator_.steal(&(other->allocator_)); |
| } |
| }; |
| |
| } // namespace jit |
| } // namespace js |
| |
| #endif /* jit_ICStubSpace_h */ |