Roland Conybeare
ec639ebb4b
Helps streamline DX1Collector in xo-gc/. Want both forward and verify entry points for the same representation.
619 lines
24 KiB
C++
619 lines
24 KiB
C++
/** @file GCObjectStore.test.cpp
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*
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* @author Roland Conybeare, Apr 2026
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**/
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#include <xo/gc/GCObjectStore.hpp>
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#include "MockCollector.hpp"
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#include <xo/object2/ListOps.hpp>
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#include <xo/object2/List.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/alloc2/GCObjectVisitor.hpp>
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#include <xo/alloc2/GCObject.hpp>
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#include <xo/alloc2/Arena.hpp>
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#include <xo/indentlog/scope.hpp>
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#include <xo/indentlog/print/tag.hpp>
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#include <xo/randomgen/xoshiro256.hpp>
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#include <xo/randomgen/random_seed.hpp>
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#include <catch2/catch.hpp>
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namespace ut {
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using xo::scm::ListOps;
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using xo::scm::DList;
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using xo::scm::DInteger;
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using xo::scm::DBoolean;
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using xo::mm::DMockCollector;
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using xo::mm::GCObjectStoreConfig;
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using xo::mm::GCObjectStore;
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using xo::mm::AGCObject;
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using xo::mm::AGCObjectVisitor;
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using xo::mm::Generation;
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using xo::mm::Role;
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using xo::mm::object_age;
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using xo::mm::ArenaConfig;
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using xo::mm::AAllocator;
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using xo::mm::DArena;
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using xo::mm::AllocInfo;
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using xo::mm::c_max_generation;
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using xo::facet::obj;
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using xo::facet::typeseq;
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using xo::facet::impl_for;
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using xo::rng::xoshiro256ss;
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using xo::rng::random_seed;
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using xo::scope;
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using xo::xtag;
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using xo::tostr;
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using std::size_t;
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using std::uint32_t;
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namespace {
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struct Testcase {
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explicit Testcase(uint32_t n_gen, uint32_t n_survive,
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size_t gc_z, uint32_t type_z,
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bool do_type_registration,
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uint32_t n_test_obj,
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uint32_t n_test_assign)
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: n_gen_{n_gen},
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n_survive_{n_survive},
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gc_size_{gc_z},
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object_type_z_{type_z},
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do_type_registration_{do_type_registration},
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n_test_obj_{n_test_obj},
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n_test_assign_{n_test_assign}
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{}
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/** number of generations in gco store **/
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uint32_t n_gen_ = 0;
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/** object promotes on surviving this many gc cycles **/
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uint32_t n_survive_ = 0;
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/** size of each generation's half-space, in bytes **/
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size_t gc_size_ = 0;
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/** Storage for object type array, in bytes.
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* (need to allow 1 pointer per type)
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**/
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uint32_t object_type_z_ = 0;
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/** if true, register types for
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* gc-aware types used in unit test
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* (i.e. DBoolean)
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**/
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bool do_type_registration_ = false;
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/** #of cells in random object graph **/
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uint32_t n_test_obj_ = 0;
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/** #of random assignments to attempt (these may create cycles, for example) **/
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uint32_t n_test_assign_ = 0;
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};
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static std::vector<Testcase> s_testcase_v = {
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/** n_gen, n_survive, gc_size, object_type_z, do_type_registration, n_obj **/
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Testcase(2, 4, 16 * 1024, 8 * 128, false, 0, 0),
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Testcase(2, 4, 16 * 1024, 8 * 128, true, 1, 0),
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Testcase(2, 4, 16 * 1024, 8 * 128, true, 2, 0),
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Testcase(2, 4, 16 * 1024, 8 * 128, true, 4, 0),
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Testcase(2, 4, 16 * 1024, 8 * 128, true, 8, 4),
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Testcase(2, 4, 16 * 1024, 8 * 128, true, 16, 7),
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};
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/** record capturing some stats for a (randomly created) gc-aware object **/
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struct Recd {
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Recd() = default;
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Recd(obj<AGCObject> value, uint32_t z, typeseq tseq) : gco_{value}, alloc_z_{z}, tseq_{tseq} {}
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// random gc-aware value
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obj<AGCObject> gco_;
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// expected allocation size (lower bound)
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uint32_t alloc_z_ = 0;
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// representation
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typeseq tseq_;
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};
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/** Create two isomorphic random object graphs containing @p n_obj nodes
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* Using a few basic data types from xo-object2
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* DBoolean
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* DList
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*
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* Generated objects stored in @p *p_gcos.
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* Individual items pushed to @p *p_v.
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*
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* Isomorphic copy in @p *p_arena2,
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* with individual items pushed to @p *p_v2.
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*
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* For each i in rance the node (*p_v)[i] is isomorphic to (*p_v2)[i]
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* (*p_v)[i] allocated entirely from @p p_gcos->new_space()
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* (*p_v2)[i] allocated entirely from @p p_arena2
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**/
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void
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random_object_graph(uint32_t n_obj,
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uint32_t n_assign,
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xoshiro256ss * p_rgen,
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std::vector<Recd> * p_v,
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GCObjectStore * p_gcos,
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std::vector<Recd> * p_v2,
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DArena * p_arena2)
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{
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if (n_obj == 0)
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return;
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for (uint32_t i_obj = 0; i_obj < n_obj; ++i_obj) {
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auto alloc = obj<AAllocator,DArena>(p_gcos->new_space());
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uint32_t sample = (*p_rgen)() % 100;
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// randomly-constructed node in object graph
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obj<AGCObject> xi;
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uint64_t alloc_z;
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typeseq tseq;
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// 2nd allocator for copy of object model
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auto alloc2 = obj<AAllocator,DArena>(p_arena2);
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// isomorphic node destined for arena2
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obj<AGCObject> xi2;
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if (sample < 50) {
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// create a DBoolean
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bool value = ((*p_rgen)() % 2 == 0);
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xi = DBoolean::box(alloc, value);
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alloc_z = sizeof(DBoolean);
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tseq = typeseq::id<DBoolean>();
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xi2 = DBoolean::box(alloc2, value);
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} else {
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// create a DList cell, with random {car, cdr}
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obj<AGCObject> car = ListOps::nil();
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obj<AGCObject,DList> cdr = ListOps::nil();
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obj<AGCObject> car2 = ListOps::nil();
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obj<AGCObject,DList> cdr2 = ListOps::nil();
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auto z = p_v->size();
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if (z > 0) {
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// random car
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{
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uint32_t i = ((*p_rgen)() % z);
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car = p_v->at(i).gco_;
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car2 = p_v2->at(i).gco_;
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}
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// random cdr
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{
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uint32_t i = ((*p_rgen)() % z);
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// is v[i] a list cell?
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{
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auto tmp = obj<AGCObject,DList>::from(p_v->at(i).gco_);
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if (tmp)
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cdr = tmp;
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}
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{
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auto tmp2 = obj<AGCObject,DList>::from(p_v2->at(i).gco_);
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if (tmp2)
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cdr2 = tmp2;
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}
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}
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}
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xi = ListOps::cons(alloc, car, cdr);
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alloc_z = sizeof(DList);
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tseq = typeseq::id<DList>();
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xi2 = ListOps::cons(alloc2, car2, cdr2);
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}
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p_v->push_back(Recd(xi, alloc_z, tseq));
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// also save parallel copy
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p_v2->push_back(Recd(xi2, alloc_z, tseq));
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}
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// also make some random modifications,
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// so that it's possible to create cycles.
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for (uint32_t j = 0; j < n_assign; ++j) {
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// choose an object at random
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uint32_t sample = (*p_rgen)() % n_obj;
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assert(sample < p_v->size());
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// is it a list cell?
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auto xj = obj<AGCObject,DList>::from((*p_v)[sample].gco_);
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auto xj2 = obj<AGCObject,DList>::from((*p_v2)[sample].gco_);
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if (xj) {
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assert(xj2);
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// flip a coin -- try modifying one of {car, cdr}
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sample = (*p_rgen)() % 100;
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if (sample < 50) {
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// modify head. skip usual gc write-barrier stuff
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sample = (*p_rgen)() % n_obj;
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// rhs could even be xj itself
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xj->head_ = (*p_v)[sample].gco_;
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xj2->head_ = (*p_v2)[sample].gco_;
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} else {
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// modify rest, maybe.
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sample = (*p_rgen)() % n_obj;
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auto rhs = obj<AGCObject,DList>::from((*p_v)[sample].gco_);
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auto rhs2 = obj<AGCObject,DList>::from((*p_v2)[sample].gco_);
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if (rhs) {
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// modify rest. skip usual gc write-barrier stuff
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assert(rhs2);
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xj->rest_ = rhs.data();
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xj2->rest_ = rhs2.data();
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}
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}
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}
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}
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} /*random_object_graph*/
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} /*namespace*/
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TEST_CASE("GCObjectStore-1", "[GCObjectStore]")
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{
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constexpr bool c_debug_flag = true;
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scope log(XO_DEBUG(c_debug_flag), "GCObjectStore test");
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std::uint64_t seed = 12168164826603821466ul;
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//random_seed(&seed);
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log && log(xtag("seed", seed));
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auto rgen = xoshiro256ss(seed);
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for (size_t i_tc = 0, n_tc = s_testcase_v.size(); i_tc < n_tc; ++i_tc) {
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const Testcase & tc = s_testcase_v[i_tc];
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INFO(tostr(xtag("i_tc", i_tc), xtag("n_tc", n_tc)));
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/** config for each half-space **/
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ArenaConfig arena_config
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= (ArenaConfig()
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.with_name("arena-name-not-used")
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.with_size(tc.gc_size_)
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.with_store_header_flag(true));
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GCObjectStoreConfig gcos_config(arena_config,
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tc.n_gen_,
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tc.n_survive_,
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tc.object_type_z_,
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c_debug_flag);
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/** Parallel arena for reference
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*
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* We will allocate parallel object model in this arena
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* for reference; then compare with GCObjectStore behavior.
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*
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* 1. arena2 doesn't have any generation layer cake stuff
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* 2. arena2 doesn't have concept of installed types.
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* It doesn't have or require any builtin ability to traverse an object model
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**/
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DArena arena2
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= DArena::map(ArenaConfig().with_name("arena2-reference")
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.with_size(tc.gc_size_ * tc.n_gen_)
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.with_store_header_flag(true));
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// object type storage will be empty unless we install a type.
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GCObjectStore gcos(gcos_config);
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// scaffold mock collector doing incremental collection
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DMockCollector mock_gc(&gcos, Generation{0});
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auto mock_gc_visitor = mock_gc.ref<AGCObjectVisitor>();
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REQUIRE(gcos.is_type_installed(typeseq::id<DList>()) == false);
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REQUIRE(gcos.is_type_installed(typeseq::id<DBoolean>()) == false);
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Generation g0{0};
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Generation g1{1};
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Generation gn{tc.n_gen_};
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// install gc-aware types that we intend using in unit test
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if (tc.do_type_registration_) {
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{
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REQUIRE(gcos.install_type(impl_for<AGCObject,DBoolean>()));
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REQUIRE(gcos.is_type_installed(typeseq::id<DBoolean>()));
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}
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{
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REQUIRE(gcos.install_type(impl_for<AGCObject,DList>()));
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REQUIRE(gcos.is_type_installed(typeseq::id<DList>()));
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}
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}
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// verify basic arena partitioning + sizing
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{
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REQUIRE(g0 != g1);
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REQUIRE(gcos.new_space());
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REQUIRE(gcos.new_space() == gcos.to_space(g0));
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REQUIRE(gcos.new_space()->reserved() >= tc.gc_size_);
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REQUIRE(gcos.from_space(g0));
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for (Generation gi = g1; gi < tc.n_gen_; ++gi) {
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// all configured generations exist
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REQUIRE(gcos.to_space(gi));
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REQUIRE(gcos.from_space(gi));
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// to- and from- space are distinct
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REQUIRE(gcos.to_space(gi) != gcos.from_space(gi));
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// arenas for different generations are distinct
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for (Generation gj = g0; gj < gi; ++gj) {
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REQUIRE(gcos.to_space(gi) != gcos.to_space(gj));
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REQUIRE(gcos.from_space(gi) != gcos.to_space(gj));
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REQUIRE(gcos.to_space(gi) != gcos.from_space(gj));
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REQUIRE(gcos.from_space(gi) != gcos.to_space(gj));
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}
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}
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// generations that weren't requested, don't exist
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if (gn < c_max_generation) {
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REQUIRE(!gcos.to_space(gn));
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REQUIRE(!gcos.from_space(gn));
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}
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}
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// verify we have non-zero space!
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{
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for (Generation gi = g0; gi < gn; ++gi) {
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INFO(tostr(xtag("gi", gi)));
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REQUIRE(gcos.to_space(gi)->allocated() == 0);
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REQUIRE(gcos.to_space(gi)->reserved() >= tc.gc_size_);
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REQUIRE(gcos.from_space(gi)->allocated() == 0);
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REQUIRE(gcos.from_space(gi)->reserved() >= tc.gc_size_);
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}
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}
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// allocator api
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auto alloc = obj<AAllocator,DArena>(gcos.new_space());
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// create object(s).
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// details depend on test case
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std::vector<Recd> x1_v;
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std::vector<Recd> x2_v;
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{
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random_object_graph(tc.n_test_obj_,
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tc.n_test_assign_,
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&rgen,
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&x1_v,
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&gcos,
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&x2_v,
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&arena2);
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//x1_v.push_back(Recd(DBoolean::box(alloc, true),
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// sizeof(DBoolean),
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// typeseq::id<DBoolean>()));
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}
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// someday: print the graph. Need a cycle-detecting printer
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REQUIRE(x1_v.size() == x2_v.size());
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for (size_t i = 0, n = x1_v.size(); i < n; ++i) {
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REQUIRE(x1_v[i].alloc_z_ == x2_v[i].alloc_z_);
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REQUIRE(x1_v[i].tseq_ == x2_v[i].tseq_);
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REQUIRE(x1_v[i].gco_._typeseq() == x1_v[i].tseq_);
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REQUIRE(x2_v[i].gco_._typeseq() == x2_v[i].tseq_);
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}
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// gcos can reveal info about allocs
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for (size_t i = 0, n = x1_v.size(); i < n; ++i)
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{
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const auto & x1 = x1_v.at(i);
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REQUIRE(gcos.contains_allocated(Role::to_space(), x1.gco_.data()));
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AllocInfo obj_info = gcos.alloc_info((std::byte *)x1.gco_.data());
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REQUIRE(obj_info.size() >= x1.alloc_z_);
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REQUIRE(obj_info.payload().first == (std::byte *)x1.gco_.data());
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REQUIRE(obj_info.tseq() == x1.tseq_.seqno());
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// also can use header2size / header2tseq convenience functions
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REQUIRE(gcos.header2size(obj_info.header()) == obj_info.size());
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REQUIRE(gcos.header2age(obj_info.header()) == object_age{0});
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REQUIRE(gcos.header2tseq(obj_info.header()) == obj_info.tseq());
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REQUIRE(gcos.is_forwarding_header(obj_info.header()) == false);
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}
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// new objects appear in to-space for generation 0
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for (Generation gi = g0; gi < gn; ++gi) {
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INFO(tostr(xtag("gi", gi)));
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if ((gi == 0) && (x1_v.size() > 0))
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REQUIRE(gcos.to_space(gi)->allocated() > 0);
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else
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REQUIRE(gcos.to_space(gi)->allocated() == 0);
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REQUIRE(gcos.from_space(gi)->allocated() == 0);
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}
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// swap_roles [but only for generation < g1, i.e. g0
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{
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gcos.swap_roles(g1);
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for (size_t i = 0, n = x1_v.size(); i < n; ++i) {
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const auto & x1 = x1_v.at(i);
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REQUIRE(gcos.contains(Role::from_space(), x1.gco_.data()));
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REQUIRE(gcos.contains_allocated(Role::from_space(), x1.gco_.data()));
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AllocInfo obj_info = gcos.alloc_info((std::byte *)x1.gco_.data());
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REQUIRE(obj_info.size() >= x1.alloc_z_);
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REQUIRE(obj_info.payload().first == (std::byte *)x1.gco_.data());
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REQUIRE(obj_info.tseq() == x1.tseq_.seqno());
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for (Generation gi = g0; gi < gn; ++gi) {
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INFO(tostr(xtag("gi", gi)));
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if (gi == 0)
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REQUIRE(gcos.from_space(gi)->allocated() > 0);
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else
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REQUIRE(gcos.from_space(gi)->allocated() == 0);
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REQUIRE(gcos.to_space(gi)->allocated() == 0);
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}
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}
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}
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// try moving everything to to-space.
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// For this to week we must have registered the type,
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// so gc knows how to traverse it
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//
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for (size_t i = 0, n = x1_v.size(); i < n; ++i) {
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|
const auto & x1 = x1_v.at(i);
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|
const auto & x2 = x2_v.at(i);
|
|
|
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INFO(tostr(xtag("i", i), xtag("n", n), xtag("x1.tseq_", x1.tseq_)));
|
|
|
|
if (tc.do_type_registration_) {
|
|
|
|
/* Action of this loop iteration:
|
|
*
|
|
* gcos arena2
|
|
* +------------+-----------+ +--------+
|
|
* | from | to | | |
|
|
* | | | | |
|
|
* | +----+ | +-----+ | | +----+ |
|
|
* | | x1 |---->| x1p | | | | x2 | |
|
|
* | +----+ | +-----+ | | +----+ |
|
|
* | | | | |
|
|
* +------------+-----------+ +--------+
|
|
*
|
|
* Before:
|
|
* x1, x2 have the same shape
|
|
* After
|
|
* x1 forward to x1p
|
|
* x1p and x2 have the same shape
|
|
*/
|
|
|
|
// note: since members of x1_v[] can refer to each other,
|
|
// it's possible that x1.gco_ is already a forwarding pointer
|
|
// before we call deep_move_root().
|
|
|
|
AGCObject * x1p_iface = gcos.lookup_type(x1.tseq_);
|
|
REQUIRE(x1p_iface);
|
|
|
|
auto x1p_data = gcos.deep_move_root(mock_gc_visitor, x1.gco_, g1);
|
|
REQUIRE(x1p_data);
|
|
|
|
obj<AGCObject> x1p_gco(x1p_iface, x1p_data);
|
|
|
|
// obj has been replaced by forwarding pointer to obj2
|
|
{
|
|
REQUIRE(gcos.contains_allocated(Role::from_space(), x1.gco_.data()));
|
|
AllocInfo obj_info = gcos.alloc_info((std::byte *)x1.gco_.data());
|
|
REQUIRE(obj_info.size() >= x1.alloc_z_);
|
|
|
|
REQUIRE(obj_info.payload().first == (std::byte *)x1.gco_.data());
|
|
REQUIRE(obj_info.is_forwarding_tseq());
|
|
}
|
|
|
|
// obj1p same contents as original obj
|
|
{
|
|
REQUIRE(gcos.contains_allocated(Role::to_space(), x1p_gco.data()));
|
|
AllocInfo obj1p_info = gcos.alloc_info((std::byte *)x1p_gco.data());
|
|
REQUIRE(obj1p_info.size() >= x1.alloc_z_);
|
|
|
|
REQUIRE(obj1p_info.payload().first == (std::byte *)x1p_gco.data());
|
|
REQUIRE(obj1p_info.tseq() == x1.tseq_.seqno());
|
|
}
|
|
|
|
REQUIRE(x1p_gco.data() != nullptr);
|
|
REQUIRE(gcos.contains(Role::to_space(), x1p_gco.data()));
|
|
REQUIRE(gcos.contains_allocated(Role::to_space(), x1p_gco.data()));
|
|
|
|
// x1p_gco must look like x2.gco
|
|
|
|
REQUIRE(x1p_gco._typeseq() == x2.gco_._typeseq());
|
|
|
|
// written out polymorphic comparison
|
|
{
|
|
// match DBoolean..
|
|
bool match_attempted = false;
|
|
{
|
|
auto x1p_b = obj<AGCObject,DBoolean>::from(x1p_gco);
|
|
auto x2_b = obj<AGCObject,DBoolean>::from(x2.gco_);
|
|
|
|
if (x1p_b && x2_b) {
|
|
match_attempted = true;
|
|
|
|
REQUIRE(x1p_b->value() == x2_b->value());
|
|
}
|
|
}
|
|
|
|
// match DList..
|
|
{
|
|
auto x1p_b = obj<AGCObject,DList>::from(x1p_gco);
|
|
auto x2_b = obj<AGCObject,DList>::from(x2.gco_);
|
|
|
|
if (x1p_b && x2_b) {
|
|
match_attempted = true;
|
|
|
|
// TODO: we could figure out the index in {x1_v[], x2_v[]}
|
|
// of x*_b {head, rest} respectively,
|
|
// and verify they're consistent.
|
|
|
|
REQUIRE(x1p_b->head()._typeseq() == x2_b->head()._typeseq());
|
|
REQUIRE(x1p_b->size() == x2_b->size());
|
|
|
|
if (x1p_b->rest()) {
|
|
REQUIRE(x2_b->rest());
|
|
} else {
|
|
// unreachable, since using sentinel objectd for nil list
|
|
REQUIRE(x2_b->rest() == nullptr);
|
|
}
|
|
}
|
|
}
|
|
|
|
REQUIRE(match_attempted);
|
|
}
|
|
|
|
} else {
|
|
// can still try to move something.
|
|
// but will fail since type isn't registered
|
|
|
|
auto x1p_data
|
|
= gcos.deep_move_root(mock_gc_visitor, x1.gco_, g1);
|
|
|
|
// control here under normal GC use
|
|
// would represent a configuration fail
|
|
|
|
REQUIRE(x1p_data == nullptr);
|
|
}
|
|
}
|
|
|
|
// Things to test:
|
|
// - deep_move_interior() // used from MutationLogStore
|
|
// - forward_inplace_aux() // used from DX1Collector.visit_child
|
|
|
|
// - report_object_types
|
|
// - report_object_ages()
|
|
|
|
bool sanitize_flag = true;
|
|
|
|
// swaps to- and from- spaces again
|
|
// Now from-space will be empty, all live objects in to-space
|
|
|
|
gcos.cleanup_phase(g1, sanitize_flag);
|
|
|
|
#ifdef NOT_YET
|
|
gcos.verify_ok(xxx objectvisitor,
|
|
xxx &verify_stats);
|
|
#endif
|
|
|
|
// - verify_ok
|
|
}
|
|
}
|
|
|
|
} /*namespace ut*/
|
|
|
|
/* end GCObjectStore.test.cpp */
|