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87b02eb949
Previously, I used a shell script to extract modification date ranges from the Git history, but that was complicated and unreliable, so now every file just gets the same year range in its copyright header. If someone needs to know when a specific file was modified and by whom, they can look at the Git history themselves; no need to include it redundantly in the header.
87 lines
2.4 KiB
C++
87 lines
2.4 KiB
C++
/* Copyright (c) 2008-2013, 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/vm/system/system.h>
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#include "avian/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 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 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(Allocator* allocator, unsigned sizeInWords,
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bool objectMask) = 0;
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virtual void* allocateImmortalFixed(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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