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89 lines
2.5 KiB
C++
89 lines
2.5 KiB
C++
/* Copyright (c) 2008-2014, Avian Contributors
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Permission to use, copy, modify, and/or distribute this software
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for any purpose with or without fee is hereby granted, provided
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that the above copyright notice and this permission notice appear
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in all copies.
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There is NO WARRANTY for this software. See license.txt for
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details. */
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#ifndef HEAP_H
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#define HEAP_H
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#include <avian/system/system.h>
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#include <avian/util/allocator.h>
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namespace vm {
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// an object must survive TenureThreshold + 2 garbage collections
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// before being copied to gen2 (must be at least 1):
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const unsigned TenureThreshold = 3;
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const unsigned FixieTenureThreshold = TenureThreshold + 2;
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class Heap : public avian::util::Allocator {
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public:
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enum CollectionType {
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MinorCollection,
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MajorCollection
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};
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enum Status {
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Null,
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Reachable,
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Unreachable,
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Tenured
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};
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class Visitor {
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public:
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virtual void visit(void*) = 0;
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};
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class Walker {
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public:
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virtual bool visit(unsigned) = 0;
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};
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class Client {
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public:
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virtual void collect(void* context, CollectionType type) = 0;
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virtual void visitRoots(Visitor*) = 0;
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virtual bool isFixed(void*) = 0;
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virtual unsigned sizeInWords(void*) = 0;
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virtual unsigned copiedSizeInWords(void*) = 0;
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virtual void copy(void*, void*) = 0;
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virtual void walk(void*, Walker*) = 0;
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};
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virtual void setClient(Client* client) = 0;
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virtual void setImmortalHeap(uintptr_t* start, unsigned sizeInWords) = 0;
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virtual unsigned remaining() = 0;
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virtual unsigned limit() = 0;
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virtual bool limitExceeded(int pendingAllocation = 0) = 0;
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virtual void collect(CollectionType type, unsigned footprint,
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int pendingAllocation) = 0;
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virtual unsigned fixedFootprint(unsigned sizeInWords, bool objectMask) = 0;
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virtual void* allocateFixed(avian::util::Allocator* allocator,
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unsigned sizeInWords,
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bool objectMask) = 0;
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virtual void* allocateImmortalFixed(avian::util::Allocator* allocator,
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unsigned sizeInWords,
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bool objectMask) = 0;
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virtual void mark(void* p, unsigned offset, unsigned count) = 0;
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virtual void pad(void* p) = 0;
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virtual void* follow(void* p) = 0;
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virtual void postVisit() = 0;
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virtual Status status(void* p) = 0;
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virtual CollectionType collectionType() = 0;
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virtual void disposeFixies() = 0;
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virtual void dispose() = 0;
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};
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Heap* makeHeap(System* system, unsigned limit);
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} // namespace vm
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#endif//HEAP_H
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