745 lines
24 KiB
C++
745 lines
24 KiB
C++
/** @file DX1Collector.cpp
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*
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* @author Roland Conybeare, Dec 2025
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**/
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#include "X1Collector.hpp"
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#include <xo/gc/DX1CollectorIterator.hpp>
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#include <xo/object2/Dictionary.hpp>
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#include <xo/object2/Array.hpp>
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#include <xo/object2/Integer.hpp>
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#include <xo/object2/Boolean.hpp>
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#include <xo/stringtable2/String.hpp>
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#include <xo/alloc2/GCObject.hpp>
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#include <xo/alloc2/GCObjectVisitor.hpp>
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#include <xo/alloc2/Allocator.hpp>
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#include <xo/alloc2/Arena.hpp>
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#include "object_age.hpp"
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#include <xo/facet/obj.hpp>
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#include <xo/indentlog/scope.hpp>
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#include <cassert>
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#include <cstdint>
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#include <sys/mman.h>
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#include <unistd.h> // for ::getpagesize()
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namespace xo {
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// for report_statistics(), report_object_types()
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using xo::scm::DDictionary;
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using xo::scm::DArray;
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using xo::scm::DString;
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using xo::scm::DInteger;
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using xo::scm::DBoolean;
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using xo::mm::AAllocator;
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using xo::facet::TypeRegistry;
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using xo::facet::typeseq;
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using xo::facet::with_facet;
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namespace mm {
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// ----- GCRunState -----
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GCRunState::GCRunState(Mode mode, Generation gc_upto)
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: mode_{mode}, gc_upto_{gc_upto}
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{}
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GCRunState
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GCRunState::idle()
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{
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return GCRunState(Mode::idle, Generation::sentinel());
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}
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GCRunState
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GCRunState::verify()
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{
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return GCRunState(Mode::verify, Generation::sentinel());
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}
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GCRunState
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GCRunState::gc_upto(Generation g)
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{
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return GCRunState(Mode::gc, Generation(g + 1));
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}
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// ----- DX1Collector -----
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using size_type = xo::mm::DX1Collector::size_type;
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DX1Collector::DX1Collector(const X1CollectorConfig & cfg)
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: config_{cfg},
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gco_store_{cfg.gco_store_config()},
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mlog_store_{cfg.mlog_config(), &gco_store_}
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{
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assert(config_.arena_config_.header_.size_bits_ +
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config_.arena_config_.header_.age_bits_ +
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config_.arena_config_.header_.tseq_bits_ <= 64);
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size_t page_z = getpagesize();
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//this->_init_object_types(cfg, page_z);
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this->_init_gc_roots(cfg, page_z);
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this->_init_mlogs(page_z);
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}
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void
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DX1Collector::_init_gc_roots(const X1CollectorConfig & cfg, std::size_t page_z)
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{
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this->root_set_
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= RootSet::map(ArenaConfig{.name_ = "x1-object-roots",
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.size_ = cfg.object_roots_z_,
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.hugepage_z_ = page_z,
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.store_header_flag_ = false});
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}
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void
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DX1Collector::_init_mlogs(std::size_t page_z)
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{
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this->mlog_store_.init_mlogs(page_z);
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}
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void
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DX1Collector::visit_pools(const MemorySizeVisitor & visitor) const
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{
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//object_types_.visit_pools(visitor);
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root_set_.visit_pools(visitor);
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gco_store_.visit_pools(visitor);
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mlog_store_.visit_pools(visitor);
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}
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bool
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DX1Collector::contains(Role r, const void * addr) const noexcept
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{
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return gco_store_.contains(r, addr);
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}
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bool
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DX1Collector::contains_allocated(Role r, const void * addr) const noexcept
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{
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return gco_store_.contains_allocated(r, addr);
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}
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Generation
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DX1Collector::generation_of(Role r, const void * addr) const noexcept
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{
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return gco_store_.generation_of(r, addr);
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}
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AllocError
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DX1Collector::last_error() const noexcept
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{
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// TODO:
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// need to adjust here if runtime errors
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// encountered during gc.
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return get_space(Role::to_space(), Generation::nursery())->last_error_;
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}
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namespace {
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size_type
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accumulate_total_aux(const DX1Collector & d,
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size_t (DArena::* get_stat_fn)() const) noexcept
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{
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//size_t z1 = (d.object_types_.store()->*get_stat_fn)();
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size_t z1 = (d.gco_store_.get_object_types()->store()->*get_stat_fn)();
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size_t z2 = (d.root_set_.store()->*get_stat_fn)();
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size_t z3 = 0;
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for (Role ri : Role::all()) {
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for (Generation gj{0}; gj < d.config_.n_generation_; ++gj) {
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const DArena * arena = d.get_space(ri, gj);
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assert(arena);
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z3 += (arena->*get_stat_fn)();
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}
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}
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return z1 + z2 + z3;
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}
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}
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size_type
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DX1Collector::reserved() const noexcept
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{
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return accumulate_total_aux(*this, &DArena::reserved);
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}
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size_type
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DX1Collector::size_total() const noexcept
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{
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return this->committed();
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}
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size_type
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DX1Collector::committed() const noexcept
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{
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return accumulate_total_aux(*this, &DArena::committed);
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}
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size_type
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DX1Collector::available() const noexcept
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{
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return accumulate_total_aux(*this, &DArena::available);
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}
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size_type
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DX1Collector::allocated() const noexcept
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{
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return accumulate_total_aux(*this, &DArena::allocated);
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}
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size_type
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DX1Collector::mutation_log_entries() const noexcept
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{
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return mlog_store_.mutation_log_entries();
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}
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namespace {
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size_type
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stat_helper(const DX1Collector & d,
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size_type (DArena::* getter)() const,
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Generation g,
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Role r)
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{
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const DArena * arena = d.get_space(r, g);
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if (arena) [[likely]]
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return (arena->*getter)();
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return 0;
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}
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}
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size_type
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DX1Collector::allocated(Generation g, Role r) const noexcept
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{
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return stat_helper(*this, &DArena::allocated, g, r);
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}
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size_type
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DX1Collector::committed(Generation g, Role r) const noexcept
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{
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return stat_helper(*this, &DArena::committed, g, r);
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}
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size_type
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DX1Collector::reserved(Generation g, Role r) const noexcept
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{
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return stat_helper(*this, &DArena::reserved, g, r);
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}
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std::int32_t
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DX1Collector::locate_address(const void * addr) const noexcept
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{
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Generation g;
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g = this->generation_of(Role::to_space(), addr);
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if (!g.is_sentinel())
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return g;
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g = this->generation_of(Role::from_space(), addr);
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if (!g.is_sentinel()) {
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// use negative values for
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return -1 - g;
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}
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return -1;
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}
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// editor bait: report-gc-statistics
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bool
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DX1Collector::report_statistics(obj<AAllocator> mm,
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obj<AAllocator> error_mm,
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obj<AGCObject> * p_output) const noexcept
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{
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(void)error_mm;
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DDictionary * rpt = DDictionary::make(mm);
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if (!rpt)
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return false;
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bool ok = true;
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// note: totals taken across both roles and generations,
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// so counts both from-space and to-space
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//
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ok &= rpt->upsert_cstr(mm, "n-generation", DInteger::box(mm, config_.n_generation_));
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ok &= rpt->upsert_cstr(mm, "n-survive-threshold", DInteger::box(mm, config_.n_survive_threshold_));
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ok &= rpt->upsert_cstr(mm, "allow-incremental-gc", DBoolean::box(mm, config_.allow_incremental_gc_));
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ok &= rpt->upsert_cstr(mm, "sanitize", DBoolean::box(mm, config_.sanitize_flag_));
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ok &= rpt->upsert_cstr(mm, "allocated", DInteger::box(mm, this->allocated()));
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ok &= rpt->upsert_cstr(mm, "committed", DInteger::box(mm, this->committed()));
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ok &= rpt->upsert_cstr(mm, "reserved", DInteger::box(mm, this->reserved()));
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ok &= rpt->upsert_cstr(mm, "n-mlog-entry", DInteger::box(mm, this->mutation_log_entries()));
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// per-(generation,role) info
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{
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for (Generation gi{0}; gi < config_.n_generation_; ++gi) {
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for (Role rj : Role::all()) {
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const DArena * arena = this->get_space(rj, gi);
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DDictionary * arena_d = DDictionary::make(mm);
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auto lo = reinterpret_cast<DInteger::value_type>(arena->lo_);
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auto free = reinterpret_cast<DInteger::value_type>(arena->free_);
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auto limit = reinterpret_cast<DInteger::value_type>(arena->limit_);
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auto hi = reinterpret_cast<DInteger::value_type>(arena->hi_);
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ok &= arena_d->upsert_cstr(mm, "lo", DInteger::box(mm, lo));
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ok &= arena_d->upsert_cstr(mm, "d-free", DInteger::box(mm, free - lo));
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ok &= arena_d->upsert_cstr(mm, "d-limit", DInteger::box(mm, limit - lo));
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ok &= arena_d->upsert_cstr(mm, "d-hi", DInteger::box(mm, hi - lo));
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const DString * key = DString::from_str(mm, arena->config_.name_);
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rpt->upsert(mm, std::make_pair(key, obj<AGCObject,DDictionary>(arena_d)));
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}
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}
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}
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*p_output = obj<AGCObject,DDictionary>(rpt);
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return ok;
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}
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bool
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DX1Collector::report_object_types(obj<AAllocator> mm,
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obj<AAllocator> error_mm,
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obj<AGCObject> * p_output) const noexcept
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{
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return gco_store_.report_object_types(mm, error_mm, p_output);
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}
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bool
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DX1Collector::report_object_ages(obj<AAllocator> mm,
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obj<AAllocator> error_mm,
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obj<AGCObject> * p_output) const noexcept
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{
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return gco_store_.report_object_types(mm, error_mm, p_output);
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}
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size_type
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DX1Collector::header2size(header_type hdr) const noexcept
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{
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return gco_store_.header2size(hdr);
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}
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object_age
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DX1Collector::header2age(header_type hdr) const noexcept
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{
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return gco_store_.header2age(hdr);
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}
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uint32_t
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DX1Collector::header2tseq(header_type hdr) const noexcept
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{
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return gco_store_.header2tseq(hdr);
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}
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bool
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DX1Collector::is_forwarding_header(header_type hdr) const noexcept
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{
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return gco_store_.is_forwarding_header(hdr);
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}
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AllocInfo
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DX1Collector::alloc_info(void * mem) const noexcept {
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return gco_store_.alloc_info((std::byte *)(mem));
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}
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bool
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DX1Collector::is_type_installed(typeseq tseq) const noexcept
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{
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return gco_store_.is_type_installed(tseq);
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}
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bool
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DX1Collector::verify_ok() noexcept
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{
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// 1. visit space pointers
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// - verify space_[*] points to space_storage_[*]
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// - verify mlog_[*] points to mlog_storage_[*]
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//
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// 2. visit roots:
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// for each root, verify that immediate child pointers are in to-space
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//
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// 3. scan to-space:
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// for each object, verify that immediate children are also in to-space
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//
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// 4. scan mutation logs:
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// verify that entries refer to to-space
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// Each AGCObject impl provides a forward_children() method,
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// that calls DX1Collector::forward_inplace(iface, &data)
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//
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// tactical plan: hijack forward_children.
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// Add run state so DX1Collector can recognize forward_inplace()
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// calls made for the purpose of checking child pointers.
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auto self = this->ref<AGCObjectVisitor>();
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GCRunState saved_runstate = runstate_;
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{
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this->runstate_ = GCRunState::verify();
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this->verify_stats_.clear();
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// 2. visit roots
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for (GCRoot & root_slot : root_set_) {
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X1VerifyStats pre = verify_stats_;
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auto gco = *root_slot.root();
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if (gco) {
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// forward_children is hijacked here to verify
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// pointer validity.
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//
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// Nested control re-enters
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// - X1Collector::forward_inplace() -> _verify_aux()
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//
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gco.visit_gco_children(self);
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}
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X1VerifyStats post = verify_stats_;
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// assert fail -> root contains ptr to from-space
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assert(pre.n_from_ == post.n_from_);
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++verify_stats_.n_gc_root_;
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}
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// 3. scan to-space for each generation
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gco_store_.verify_ok(this->ref<AGCObjectVisitor>(), &(this->verify_stats_));
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// 4. scan mutation logs
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mlog_store_.verify_ok(&gco_store_,
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&(this->verify_stats_));
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}
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// restore run state at end of verify cycle
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this->runstate_ = saved_runstate;
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bool ok = verify_stats_.is_ok();
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return ok;
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}
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const AGCObject *
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DX1Collector::lookup_type(typeseq tseq) const noexcept
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{
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return gco_store_.lookup_type(tseq);
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}
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/* editor bait: register_type */
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bool
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DX1Collector::install_type(const AGCObject & meta) noexcept
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{
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return gco_store_.install_type(meta);
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}
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void
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DX1Collector::add_gc_root_poly(obj<AGCObject> * p_root) noexcept
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{
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root_set_.push_back(GCRoot(p_root));
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}
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void
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DX1Collector::remove_gc_root_poly(obj<AGCObject> * p_root) noexcept
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{
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// iterate over roots_, find p_root and drop it
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(void)p_root;
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}
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void
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DX1Collector::request_gc(Generation upto) noexcept
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{
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if (gc_blocked_ > 0) {
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if (gc_pending_upto_ < upto) {
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this->gc_pending_upto_ = upto;
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}
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/* intend collecting later */
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} else {
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this->execute_gc(upto);
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}
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}
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void
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DX1Collector::execute_gc(Generation upto) noexcept
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{
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scope log(XO_DEBUG(config_.debug_flag_), xtag("upto", upto));
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assert(!runstate_.is_running());
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//auto t0 = std::chrono::steady_clock::now();
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log && log("memory");
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auto visitor = [&log](const MemorySizeInfo & info) {
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log && log(xtag("resource", info.resource_name_),
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xtag("used", info.used_),
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xtag("alloc", info.allocated_),
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xtag("commit", info.committed_),
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xtag("resv", info.reserved_),
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xtag("lo", info.lo_),
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xtag("hi", info.hi_));
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};
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this->visit_pools(visitor);
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if (config_.sanitize_flag_) {
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log && log("step 0a : verify");
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this->verify_ok();
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}
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log && log("step 0b : update run state");
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this->runstate_ = GCRunState::gc_upto(upto);
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log && log("step 0c : [STUB] snapshot alloc state");
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log && log("step 0d : [STUB] scan for object statistics");
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log && log("step 1 : swap from/to roles (now to-space is empty)");
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this->_swap_roles(upto);
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log && log(xtag("from_0", get_space(Role::from_space(), Generation{0})->lo_),
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xtag("to_0", get_space(Role::to_space(), Generation{0})->lo_));
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log && log("step 2a : copy roots");
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this->_copy_roots(upto);
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log && log("step 2b : [STUB] copy pinned");
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log && log("step 3 : [STUB] forward mutation log");
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mlog_store_.forward_mutation_log(this->ref<AGCObjectVisitor>(), upto);
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log && log("step 4a : [STUB] run destructors");
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log && log("step 4b : [STUB] keep reachable weak pointers");
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log && log("step 5 : cleanup");
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this->_cleanup_phase(upto);
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if (config_.sanitize_flag_) {
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log && log("step 5b : verify");
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bool ok = this->verify_ok();
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log && log(xtag("n-gc-root", verify_stats_.n_gc_root_),
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xtag("n-ext", verify_stats_.n_ext_),
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xtag("n-from", verify_stats_.n_from_),
|
|
xtag("n-to", verify_stats_.n_to_),
|
|
xtag("n-fwd", verify_stats_.n_fwd_),
|
|
xtag("n-no-iface", verify_stats_.n_no_iface_),
|
|
xtag("n-mlog-vital", verify_stats_.n_mlog_vital_),
|
|
xtag("n-mlog-stale", verify_stats_.n_mlog_stale_),
|
|
xtag("n-mlog-from", verify_stats_.n_mlog_from_),
|
|
xtag("n-mlog-wild", verify_stats_.n_mlog_wild_));
|
|
|
|
assert(ok);
|
|
}
|
|
}
|
|
|
|
void
|
|
DX1Collector::_swap_roles(Generation upto) noexcept
|
|
{
|
|
scope log(XO_DEBUG(true), xtag("upto", upto));
|
|
|
|
gco_store_.swap_roles(upto);
|
|
mlog_store_.swap_roles(upto);
|
|
}
|
|
|
|
void
|
|
DX1Collector::_cleanup_phase(Generation upto)
|
|
{
|
|
scope log(XO_DEBUG(true), xtag("upto", upto));
|
|
|
|
this->gco_store_.cleanup_phase(upto, config_.sanitize_flag_);
|
|
this->runstate_ = GCRunState::idle();
|
|
}
|
|
|
|
void
|
|
DX1Collector::_copy_roots(Generation upto) noexcept
|
|
{
|
|
scope log(XO_DEBUG(true));
|
|
|
|
for (RootSet::size_type i = 0, n = root_set_.size(); i < n; ++i) {
|
|
GCRoot & slot = root_set_[i];
|
|
|
|
log && log("copy root",
|
|
xtag("slot.root()", slot.root()),
|
|
xtag("slot.root()->data_", slot.root()->data_));
|
|
|
|
void * root_to = gco_store_.deep_move_root(this->ref<AGCObjectVisitor>(), *slot.root(), upto);
|
|
|
|
slot.root()->reset_opaque(root_to);
|
|
|
|
log && log(xtag("slot.root()->data_", slot.root()->data_));
|
|
}
|
|
}
|
|
|
|
void
|
|
DX1Collector::visit_child(AGCObject * lhs_iface,
|
|
void ** lhs_data)
|
|
{
|
|
// MAYBE: adapter distinct from DX1Collector that supports GCObjectVisitor facet,
|
|
// calls DX1Collector::_verify_aux()
|
|
|
|
if (runstate_.is_running()) {
|
|
Generation upto = runstate_.gc_upto();
|
|
|
|
// called during collection phase
|
|
gco_store_.forward_inplace_aux(this->ref<AGCObjectVisitor>(), lhs_iface, lhs_data, upto);
|
|
} else if (runstate_.is_verify()) {
|
|
// called during verify_ok
|
|
this->_verify_aux(lhs_iface, *lhs_data);
|
|
} else {
|
|
// should be unreachable
|
|
assert(false);
|
|
}
|
|
}
|
|
|
|
void
|
|
DX1Collector::_verify_aux(AGCObject * iface, void * data)
|
|
{
|
|
//scope log(XO_DEBUG(config_.debug_flag_), xtag("data", data));
|
|
|
|
(void)iface;
|
|
(void)data;
|
|
|
|
Generation g1 = this->generation_of(Role::to_space(), data);
|
|
|
|
if (g1.is_sentinel()) {
|
|
assert(this->contains(Role::to_space(), data) == false);
|
|
|
|
Generation g2 = this->generation_of(Role::from_space(), data);
|
|
|
|
if (!g2.is_sentinel()) {
|
|
// verify failure - live pointer still refers to from-space
|
|
|
|
++(verify_stats_.n_from_);
|
|
} else {
|
|
++(verify_stats_.n_ext_);
|
|
}
|
|
} else {
|
|
assert(this->contains(Role::to_space(), data));
|
|
|
|
++(verify_stats_.n_to_);
|
|
}
|
|
}
|
|
|
|
auto
|
|
DX1Collector::alloc(typeseq t, size_type z) noexcept -> value_type
|
|
{
|
|
return with_facet<AAllocator>::mkobj(new_space()).alloc(t, z);
|
|
}
|
|
|
|
auto
|
|
DX1Collector::super_alloc(typeseq t, size_type z) noexcept -> value_type {
|
|
return with_facet<AAllocator>::mkobj(this->new_space()).super_alloc(t, z);
|
|
}
|
|
|
|
auto
|
|
DX1Collector::sub_alloc(size_type z, bool complete) noexcept -> value_type {
|
|
return with_facet<AAllocator>::mkobj(this->new_space()).sub_alloc(z, complete);
|
|
}
|
|
|
|
auto
|
|
DX1Collector::alloc_copy(value_type src) noexcept -> value_type {
|
|
return with_facet<AAllocator>::mkobj(this->new_space()).alloc_copy(src);
|
|
}
|
|
|
|
bool
|
|
DX1Collector::expand(size_type z) noexcept
|
|
{
|
|
if (with_facet<AAllocator>::mkobj(to_space(Generation{0})).expand(z))
|
|
return with_facet<AAllocator>::mkobj(from_space(Generation{0})).expand(z);
|
|
|
|
return false;
|
|
}
|
|
|
|
// editor bait: write barrier
|
|
void
|
|
DX1Collector::assign_member(void * parent, obj<AGCObject> * p_lhs, obj<AGCObject> rhs)
|
|
{
|
|
scope log(XO_DEBUG(config_.debug_flag_),
|
|
xtag("parent", parent), xtag("lhs", p_lhs), xtag("rhs", rhs.data()));
|
|
|
|
// ++ stats.n_mutation_;
|
|
|
|
if (runstate_.is_running()) {
|
|
*p_lhs = rhs;
|
|
|
|
// for removal of all doubt:
|
|
// don't log mutations during GC cycle.
|
|
// That said: should not be happening!
|
|
assert(false);
|
|
|
|
return;
|
|
} else {
|
|
mlog_store_.assign_member(&gco_store_, parent, p_lhs, rhs);
|
|
|
|
}
|
|
} /*assign_member*/
|
|
|
|
DX1CollectorIterator
|
|
DX1Collector::begin() const noexcept
|
|
{
|
|
scope log(XO_DEBUG(false));
|
|
|
|
const DArena * arena
|
|
= get_space(Role::to_space(),
|
|
Generation{0});
|
|
|
|
return DX1CollectorIterator(this,
|
|
Generation{0},
|
|
Generation{config_.n_generation_},
|
|
arena->begin(),
|
|
arena->end());
|
|
}
|
|
|
|
DX1CollectorIterator
|
|
DX1Collector::end() const noexcept {
|
|
scope log(XO_DEBUG(false));
|
|
|
|
Generation gen_hi = Generation{config_.n_generation_};
|
|
|
|
/** valid iterator for end points to end of last DArena.
|
|
* otherwise will interfere with working compare
|
|
* (since invalid iterators are incomparable)
|
|
**/
|
|
|
|
const DArena * arena
|
|
= get_space(Role::to_space(),
|
|
Generation(config_.n_generation_ - 1));
|
|
DArenaIterator arena_end = arena->end();
|
|
|
|
return DX1CollectorIterator(this,
|
|
gen_hi,
|
|
gen_hi,
|
|
arena_end,
|
|
arena_end);
|
|
}
|
|
|
|
void
|
|
DX1Collector::clear() noexcept {
|
|
for (Role ri : Role::all()) {
|
|
for (Generation gj{0}; gj < config_.n_generation_; ++gj) {
|
|
DArena * arena = this->get_space(ri, gj);
|
|
|
|
assert(arena);
|
|
|
|
arena->clear();
|
|
}
|
|
}
|
|
}
|
|
} /*namespace mm*/
|
|
} /*namespace xo*/
|
|
|
|
/* end DX1Collector.cpp */
|