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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* 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(JSRuntime* rt);
#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 JitCompartment 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)
{}
inline void adoptFrom(FallbackICStubSpace* other) {
allocator_.steal(&(other->allocator_));
}
};
} // namespace jit
} // namespace js
#endif /* jit_ICStubSpace_h */
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