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/* -*- 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_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)
void freeAllAfterMinorGC(JS::Zone* zone);
#ifdef DEBUG
bool isEmpty() const { return allocator_.isEmpty(); }
#endif
size_t sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const {
return allocator_.sizeOfExcludingThis(mallocSizeOf);
}
};
// Space for optimized stubs. Every JitRealm has a single
// OptimizedICStubSpace.
struct OptimizedICStubSpace : public ICStubSpace {
static const size_t STUB_DEFAULT_CHUNK_SIZE = 4096;
public:
OptimizedICStubSpace() : ICStubSpace(STUB_DEFAULT_CHUNK_SIZE) {}
};
// Space for fallback stubs. Every BaselineScript has a
// FallbackICStubSpace.
struct FallbackICStubSpace : public ICStubSpace {
static const size_t STUB_DEFAULT_CHUNK_SIZE = 4096;
public:
FallbackICStubSpace() : ICStubSpace(STUB_DEFAULT_CHUNK_SIZE) {}
};
} // namespace jit
} // namespace js
#endif /* jit_ICStubSpace_h */
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