332 lines
12 KiB
C++
332 lines
12 KiB
C++
/*
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Copyright (c) 2020 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#include <vector>
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#include <cstring>
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#include "runtime/object.h"
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#include "runtime/hash.h"
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namespace lean {
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extern "C" LEAN_EXPORT uint8 lean_sharecommon_eq(b_obj_arg o1, b_obj_arg o2) {
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lean_assert(!lean_is_scalar(o1));
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lean_assert(!lean_is_scalar(o2));
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size_t sz1 = lean_object_byte_size(o1);
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size_t sz2 = lean_object_byte_size(o2);
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if (sz1 != sz2) return false;
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// compare relevant parts of the header
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if (lean_ptr_tag(o1) != lean_ptr_tag(o2)) return false;
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if (lean_ptr_other(o1) != lean_ptr_other(o2)) return false;
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size_t header_sz = sizeof(lean_object);
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lean_assert(sz1 >= header_sz);
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// compare objects' bodies
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return memcmp(reinterpret_cast<char*>(o1) + header_sz, reinterpret_cast<char*>(o2) + header_sz, sz1 - header_sz) == 0;
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}
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extern "C" LEAN_EXPORT uint64_t lean_sharecommon_hash(b_obj_arg o) {
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lean_assert(!lean_is_scalar(o));
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size_t sz = lean_object_byte_size(o);
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size_t header_sz = sizeof(lean_object);
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// hash relevant parts of the header
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unsigned init = hash(lean_ptr_tag(o), lean_ptr_other(o));
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// hash body
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return hash_str(sz - header_sz, reinterpret_cast<unsigned char const *>(o) + header_sz, init);
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}
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// unsafe def mkObjectMap : Unit → ObjectMap
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extern "C" obj_res lean_mk_object_map(obj_arg);
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// unsafe def ObjectMap.find? (m : ObjectMap) (k : Object) : Option Object
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extern "C" obj_res lean_object_map_find(obj_arg m, obj_arg k);
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// unsafe def ObjectMap.insert (m : ObjectMap) (k v : Object) : ObjectMap
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extern "C" obj_res lean_object_map_insert(obj_arg m, obj_arg k, obj_arg v);
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// unsafe def mkObjectSet : Unit → ObjectSet
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extern "C" obj_res lean_mk_object_set(obj_arg);
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// unsafe def ObjectSet.find? (s : ObjectSet) (o : Object) : Option Object
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extern "C" obj_res lean_object_set_find(obj_arg s, obj_arg o);
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// unsafe def ObjectSet.insert (s : ObjectSet) (o : Object) : ObjectSet
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extern "C" obj_res lean_object_set_insert(obj_arg s, obj_arg o);
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// unsafe def mkObjectPersistentMap : Unit → ObjectPersistentMap
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extern "C" obj_res lean_mk_object_pmap(obj_arg);
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// unsafe def ObjectPersistentMap.find? (m : ObjectPersistentMap) (k : Object) : Option Object
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extern "C" obj_res lean_object_pmap_find(obj_arg m, obj_arg k);
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// unsafe def ObjectPersistentMap.insert (m : ObjectPersistentMap) (k v : Object) : ObjectPersistentMap
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extern "C" obj_res lean_object_pmap_insert(obj_arg m, obj_arg k, obj_arg v);
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// unsafe def mkObjectPersistentSet : Unit → ObjectPersistentSet
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extern "C" obj_res lean_mk_object_pset(obj_arg);
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// unsafe def ObjectPersistentSet.find? (s : ObjectPersistentSet) (o : Object) : Option Object
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extern "C" obj_res lean_object_pset_find(obj_arg s, obj_arg o);
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// unsafe def ObjectPersistentSet.insert (s : ObjectPersistentSet) (o : Object) : ObjectPersistentSet
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extern "C" obj_res lean_object_pset_insert(obj_arg s, obj_arg o);
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static obj_res mk_pair(obj_arg a, obj_arg b) {
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object * r = alloc_cnstr(0, 2, 0);
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lean_ctor_set(r, 0, a);
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lean_ctor_set(r, 1, b);
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// std::cout << "mk_pair " << a << " " << b << std::endl;
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return r;
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}
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extern "C" LEAN_EXPORT obj_res lean_sharecommon_mk_state(obj_arg) {
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return mk_pair(lean_mk_object_map(lean_box(0)), lean_mk_object_set(lean_box(0)));
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}
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extern "C" LEAN_EXPORT obj_res lean_sharecommon_mk_pstate(obj_arg) {
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return mk_pair(lean_mk_object_pmap(lean_box(0)), lean_mk_object_pset(lean_box(0)));
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}
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class sharecommon_state_core {
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protected:
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object * m_map;
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object * m_set;
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public:
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sharecommon_state_core(obj_arg s) {
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m_map = lean_ctor_get(s, 0); lean_inc(m_map);
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m_set = lean_ctor_get(s, 1); lean_inc(m_set);
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// std::cout << "sharecommon_state_core " << m_map << " " << m_set << std::endl;
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lean_dec(s);
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}
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~sharecommon_state_core() {
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lean_dec(m_map);
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lean_dec(m_set);
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}
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obj_res pack(obj_arg a) {
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obj_res r = mk_pair(a, mk_pair(m_map, m_set));
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m_map = lean_box(0);
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m_set = lean_box(0);
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return r;
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}
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};
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class sharecommon_state : public sharecommon_state_core {
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public:
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sharecommon_state(obj_arg s):sharecommon_state_core(s) {}
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obj_res map_find(b_obj_arg k) {
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lean_inc(m_map); lean_inc(k);
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return lean_object_map_find(m_map, k);
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}
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void map_insert(obj_arg k, obj_arg v) {
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m_map = lean_object_map_insert(m_map, k, v);
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}
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obj_res set_find(b_obj_arg o) {
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lean_inc(m_set); lean_inc(o);
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return lean_object_set_find(m_set, o);
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}
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void set_insert(obj_arg o) {
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m_set = lean_object_set_insert(m_set, o);
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}
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};
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class sharecommon_pstate : public sharecommon_state_core {
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public:
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sharecommon_pstate(obj_arg s):sharecommon_state_core(s) {}
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obj_res map_find(b_obj_arg k) {
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lean_inc(m_map); lean_inc(k);
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return lean_object_pmap_find(m_map, k);
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}
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void map_insert(obj_arg k, obj_arg v) {
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m_map = lean_object_pmap_insert(m_map, k, v);
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}
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obj_res set_find(b_obj_arg o) {
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lean_inc(m_set); lean_inc(o);
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return lean_object_pset_find(m_set, o);
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}
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void set_insert(obj_arg o) {
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m_set = lean_object_pset_insert(m_set, o);
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}
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};
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template<typename state>
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class sharecommon_fn {
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state m_state;
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std::vector<lean_object*> m_children;
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std::vector<lean_object*> m_todo;
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void clear_children() {
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m_children.clear();
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}
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bool push_child(b_obj_arg a) {
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if (lean_is_scalar(a)) {
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m_children.push_back(a);
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return true;
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}
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switch (lean_ptr_tag(a)) {
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case LeanReserved:
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lean_unreachable();
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// We do not maximize sharing for the following kinds of objects
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case LeanMPZ: case LeanThunk:
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case LeanTask: case LeanRef:
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case LeanExternal: case LeanClosure:
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m_children.push_back(a);
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return true;
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default:
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break;
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}
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// Check whether we have already maximized sharing for `a`
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obj_res o = m_state.map_find(a);
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if (o != lean_box(0)) {
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obj_res r = lean_ctor_get(o, 0);
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lean_dec(o);
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// The map still has a reference to `r`
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m_children.push_back(r);
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// std::cout << "cached maximized " << r << "\n";
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return true;
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}
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m_todo.push_back(a);
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return false;
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}
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void save(b_obj_arg a, obj_arg new_a) {
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lean_assert(m_todo.size() > 0);
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lean_assert(m_todo.back() == a);
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m_todo.pop_back();
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obj_res opt_new_r = m_state.set_find(new_a);
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if (opt_new_r != lean_box(0)) {
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lean_dec(new_a); // we already have a maximally shared term equivalent to `new_a`
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new_a = lean_ctor_get(opt_new_r, 0);
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lean_inc(new_a);
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lean_dec(opt_new_r);
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lean_inc(a);
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m_state.map_insert(a, new_a);
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// std::cout << "already maximized " << new_a << "\n";
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} else {
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lean_inc(a);
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lean_inc_n(new_a, 3);
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m_state.set_insert(new_a); // `new_a` is a new maximally shared term
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m_state.map_insert(a, new_a); // `new_a` is the maximally shared representation for `a`
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m_state.map_insert(new_a, new_a); // `new_a` is the maximally shared representation for itself
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// std::cout << "new maximized " << new_a << "\n";
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}
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}
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void visit_array(b_obj_arg a) {
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clear_children();
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bool missing_children = false;
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size_t sz = array_size(a);
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for (size_t i = 0; i < sz; i++) {
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if (!push_child(lean_array_get_core(a, i))) {
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missing_children = true;
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}
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}
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if (missing_children)
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return;
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lean_array_object * new_a = (lean_array_object*)lean_alloc_array(sz, sz);
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for (size_t i = 0; i < sz; i++) {
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lean_inc(m_children[i]);
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lean_array_set_core((lean_object*)new_a, i, m_children[i]);
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}
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save(a, (lean_object*)new_a);
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}
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void visit_sarray(b_obj_arg a) {
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size_t sz = lean_sarray_size(a);
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unsigned elem_sz = lean_sarray_elem_size(a);
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lean_sarray_object * new_a = (lean_sarray_object*)lean_alloc_sarray(elem_sz, sz, sz);
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memcpy(new_a->m_data, lean_to_sarray(a)->m_data, elem_sz*sz);
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save(a, (lean_object*)new_a);
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}
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void visit_string(b_obj_arg a) {
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size_t sz = lean_string_size(a);
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size_t len = lean_string_len(a);
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lean_string_object * new_a = (lean_string_object*)lean_alloc_string(sz, sz, len);
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lean_set_st_header((lean_object*)new_a, LeanString, 0);
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new_a->m_size = sz;
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new_a->m_capacity = sz;
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new_a->m_length = len;
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memcpy(new_a->m_data, lean_to_string(a)->m_data, sz);
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save(a, (lean_object*)new_a);
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}
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void visit_ctor(b_obj_arg a) {
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clear_children();
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unsigned num_objs = lean_ctor_num_objs(a);
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bool missing_child = false;
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for (unsigned i = 0; i < num_objs; i++) {
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if (!push_child(lean_ctor_get(a, i))) {
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// std::cout << "missing_child " << a << " #" << i << " := " << lean_ctor_get(a, i) << std::endl;
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missing_child = true;
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lean_assert(m_todo.back() == lean_ctor_get(a, i));
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}
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}
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if (missing_child)
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return;
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unsigned tag = lean_ptr_tag(a);
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unsigned sz = lean_object_byte_size(a);
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unsigned scalar_offset = sizeof(lean_object) + num_objs*sizeof(void*);
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unsigned scalar_sz = sz - scalar_offset;
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lean_object * new_a = lean_alloc_ctor(tag, num_objs, scalar_sz);
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for (unsigned i = 0; i < num_objs; i++) {
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lean_inc(m_children[i]);
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lean_ctor_set(new_a, i, m_children[i]);
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}
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if (scalar_sz > 0) {
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memcpy(reinterpret_cast<char*>(new_a) + scalar_offset, reinterpret_cast<char*>(a) + scalar_offset, scalar_sz);
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}
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save(a, new_a);
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}
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public:
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sharecommon_fn(obj_arg s):m_state(s) {
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}
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obj_res operator()(obj_arg a) {
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if (push_child(a)) {
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return m_state.pack(a);
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}
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while (!m_todo.empty()) {
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b_obj_arg curr = m_todo.back();
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// std::cout << "visiting " << curr << " " << static_cast<unsigned>(lean_ptr_tag(curr)) << "\n";
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switch (lean_ptr_tag(curr)) {
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case LeanClosure: lean_unreachable();
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case LeanArray: visit_array(curr); break;
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case LeanScalarArray: visit_sarray(curr); break;
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case LeanString: visit_string(curr); break;
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case LeanMPZ: lean_unreachable();
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case LeanThunk: lean_unreachable();
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case LeanTask: lean_unreachable();
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case LeanRef: lean_unreachable();
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case LeanExternal: lean_unreachable();
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case LeanReserved: lean_unreachable();
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default: visit_ctor(curr); break;
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}
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}
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obj_res o = m_state.map_find(a);
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lean_assert(o != lean_box(0));
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obj_res r = lean_ctor_get(o, 0);
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lean_inc(r);
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lean_dec(o);
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lean_dec(a);
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return m_state.pack(r);
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}
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};
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// def State.shareCommon {α} (s : State) (a : α) : α × State
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extern "C" LEAN_EXPORT obj_res lean_state_sharecommon(obj_arg s, obj_arg a) {
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return sharecommon_fn<sharecommon_state>(s)(a);
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}
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// def PersistentState.shareCommon {α} (s : PersistentState) (a : α) : α × PersistentState
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extern "C" LEAN_EXPORT obj_res lean_persistent_state_sharecommon(obj_arg s, obj_arg a) {
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return sharecommon_fn<sharecommon_pstate>(s)(a);
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}
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};
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