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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds, Aina Niemetz |
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* |
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* This file is part of the cvc5 project. |
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* |
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* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
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* in the top-level source directory and their institutional affiliations. |
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* All rights reserved. See the file COPYING in the top-level source |
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* directory for licensing information. |
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* **************************************************************************** |
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* |
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* Implementation of techniqures for static preprocessing and analysis |
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* of sygus conjectures. |
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*/ |
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#include "theory/quantifiers/sygus/sygus_process_conj.h" |
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|
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#include <sstream> |
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#include <stack> |
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|
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#include "options/quantifiers_options.h" |
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#include "theory/quantifiers/sygus/term_database_sygus.h" |
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#include "theory/quantifiers/term_util.h" |
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#include "theory/rewriter.h" |
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|
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using namespace cvc5::kind; |
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using namespace std; |
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|
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namespace cvc5 { |
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namespace theory { |
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namespace quantifiers { |
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|
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void SynthConjectureProcessFun::init(Node f) |
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{ |
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d_synth_fun = f; |
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Assert(f.getType().isFunction()); |
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|
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// initialize the arguments |
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std::unordered_map<TypeNode, unsigned> type_to_init_deq_id; |
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std::vector<TypeNode> argTypes = f.getType().getArgTypes(); |
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for (unsigned j = 0; j < argTypes.size(); j++) |
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{ |
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TypeNode atn = argTypes[j]; |
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std::stringstream ss; |
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ss << "a" << j; |
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Node k = NodeManager::currentNM()->mkBoundVar(ss.str(), atn); |
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d_arg_vars.push_back(k); |
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d_arg_var_num[k] = j; |
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d_arg_props.push_back(SynthConjectureProcessArg()); |
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} |
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} |
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|
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bool SynthConjectureProcessFun::checkMatch( |
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Node cn, Node n, std::unordered_map<unsigned, Node>& n_arg_map) |
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{ |
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std::vector<Node> vars; |
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std::vector<Node> subs; |
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for (std::unordered_map<unsigned, Node>::iterator it = n_arg_map.begin(); |
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it != n_arg_map.end(); |
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++it) |
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{ |
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Assert(it->first < d_arg_vars.size()); |
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Assert( |
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it->second.getType().isComparableTo(d_arg_vars[it->first].getType())); |
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vars.push_back(d_arg_vars[it->first]); |
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subs.push_back(it->second); |
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} |
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Node cn_subs = |
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cn.substitute(vars.begin(), vars.end(), subs.begin(), subs.end()); |
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cn_subs = Rewriter::rewrite(cn_subs); |
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n = Rewriter::rewrite(n); |
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return cn_subs == n; |
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} |
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|
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bool SynthConjectureProcessFun::isArgVar(Node n, unsigned& arg_index) |
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{ |
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if (n.isVar()) |
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{ |
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std::unordered_map<Node, unsigned>::iterator ita = d_arg_var_num.find(n); |
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if (ita != d_arg_var_num.end()) |
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{ |
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arg_index = ita->second; |
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return true; |
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} |
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} |
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return false; |
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} |
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|
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Node SynthConjectureProcessFun::inferDefinition( |
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Node n, |
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std::unordered_map<Node, unsigned>& term_to_arg_carry, |
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std::unordered_map<Node, std::unordered_set<Node>>& free_vars) |
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{ |
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std::unordered_map<TNode, Node> visited; |
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std::unordered_map<TNode, Node>::iterator it; |
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std::stack<TNode> visit; |
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TNode cur; |
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visit.push(n); |
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do |
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{ |
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cur = visit.top(); |
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visit.pop(); |
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it = visited.find(cur); |
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if (it == visited.end()) |
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{ |
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// if it is ground, we can use it |
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if (free_vars[cur].empty()) |
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{ |
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visited[cur] = cur; |
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} |
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else |
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{ |
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// if it is term used by another argument, use it |
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std::unordered_map<Node, unsigned>::iterator itt = |
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term_to_arg_carry.find(cur); |
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if (itt != term_to_arg_carry.end()) |
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{ |
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visited[cur] = d_arg_vars[itt->second]; |
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} |
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else if (cur.getNumChildren() > 0) |
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{ |
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// try constructing children |
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visited[cur] = Node::null(); |
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visit.push(cur); |
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for (unsigned i = 0; i < cur.getNumChildren(); i++) |
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{ |
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visit.push(cur[i]); |
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} |
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} |
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else |
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{ |
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return Node::null(); |
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} |
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} |
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} |
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else if (it->second.isNull()) |
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{ |
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Node ret = cur; |
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bool childChanged = false; |
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std::vector<Node> children; |
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if (cur.getMetaKind() == kind::metakind::PARAMETERIZED) |
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{ |
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children.push_back(cur.getOperator()); |
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} |
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for (unsigned i = 0; i < cur.getNumChildren(); i++) |
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{ |
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it = visited.find(cur[i]); |
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Assert(it != visited.end()); |
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Assert(!it->second.isNull()); |
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childChanged = childChanged || cur[i] != it->second; |
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children.push_back(it->second); |
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} |
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if (childChanged) |
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{ |
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ret = NodeManager::currentNM()->mkNode(cur.getKind(), children); |
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} |
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visited[cur] = ret; |
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} |
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} while (!visit.empty()); |
160 |
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Assert(visited.find(n) != visited.end()); |
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Assert(!visited.find(n)->second.isNull()); |
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return visited[n]; |
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} |
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|
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unsigned SynthConjectureProcessFun::assignRelevantDef( |
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Node def, std::vector<unsigned>& args) |
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{ |
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unsigned id = 0; |
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if (def.isNull()) |
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{ |
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// prefer one that already has a definition, if one exists |
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for (unsigned j = 0; j < args.size(); j++) |
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{ |
174 |
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unsigned i = args[j]; |
175 |
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if (!d_arg_props[i].d_template.isNull()) |
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{ |
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id = j; |
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break; |
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} |
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} |
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} |
182 |
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unsigned rid = args[id]; |
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// for merging previously equivalent definitions |
184 |
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std::unordered_map<Node, unsigned> prev_defs; |
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for (unsigned j = 0; j < args.size(); j++) |
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{ |
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unsigned i = args[j]; |
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Trace("sygus-process-arg-deps") << " ...processed arg #" << i; |
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if (!d_arg_props[i].d_template.isNull()) |
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{ |
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if (d_arg_props[i].d_template == def) |
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{ |
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// definition was consistent |
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} |
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else |
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{ |
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Node t = d_arg_props[i].d_template; |
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std::unordered_map<Node, unsigned>::iterator itt = prev_defs.find(t); |
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if (itt != prev_defs.end()) |
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{ |
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// merge previously equivalent definitions |
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d_arg_props[i].d_template = d_arg_vars[itt->second]; |
203 |
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Trace("sygus-process-arg-deps") |
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<< " (merged equivalent def from argument "; |
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Trace("sygus-process-arg-deps") << itt->second << ")." << std::endl; |
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} |
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else |
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{ |
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// store this as previous |
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prev_defs[t] = i; |
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// now must be relevant |
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d_arg_props[i].d_relevant = true; |
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Trace("sygus-process-arg-deps") |
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<< " (marked relevant, overwrite definition)." << std::endl; |
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} |
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} |
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} |
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else |
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{ |
220 |
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if (def.isNull()) |
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{ |
222 |
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if (i != rid) |
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{ |
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// marked as relevant, but template can be set equal to master |
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d_arg_props[i].d_template = d_arg_vars[rid]; |
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Trace("sygus-process-arg-deps") << " (new definition, map to master " |
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<< d_arg_vars[rid] << ")." |
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<< std::endl; |
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} |
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else |
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{ |
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d_arg_props[i].d_relevant = true; |
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Trace("sygus-process-arg-deps") << " (marked relevant)." << std::endl; |
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} |
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} |
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else |
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{ |
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// has new definition |
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d_arg_props[i].d_template = def; |
240 |
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Trace("sygus-process-arg-deps") << " (new definition " << def << ")." |
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<< std::endl; |
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} |
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} |
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} |
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return rid; |
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} |
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|
248 |
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void SynthConjectureProcessFun::processTerms( |
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std::vector<Node>& ns, |
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std::vector<Node>& ks, |
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Node nf, |
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std::unordered_set<Node>& synth_fv, |
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std::unordered_map<Node, std::unordered_set<Node>>& free_vars) |
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{ |
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Assert(ns.size() == ks.size()); |
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Trace("sygus-process-arg-deps") << "Process " << ns.size() |
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<< " applications of " << d_synth_fun << "..." |
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<< std::endl; |
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|
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// get the relevant variables |
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// relevant variables are those that appear in the body of the conjunction |
262 |
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std::unordered_set<Node> rlv_vars; |
263 |
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Assert(free_vars.find(nf) != free_vars.end()); |
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rlv_vars = free_vars[nf]; |
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|
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// get the single occurrence variables |
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// single occurrence variables are those that appear in only one position, |
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// as an argument to the function-to-synthesize. |
269 |
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std::unordered_map<Node, bool> single_occ_variables; |
270 |
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for (unsigned index = 0; index < ns.size(); index++) |
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{ |
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Node n = ns[index]; |
273 |
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for (unsigned i = 0; i < n.getNumChildren(); i++) |
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{ |
275 |
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Node nn = n[i]; |
276 |
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if (nn.isVar()) |
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{ |
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std::unordered_map<Node, bool>::iterator its = |
279 |
44 |
single_occ_variables.find(nn); |
280 |
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if (its == single_occ_variables.end()) |
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{ |
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// only irrelevant variables |
283 |
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single_occ_variables[nn] = rlv_vars.find(nn) == rlv_vars.end(); |
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} |
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else |
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{ |
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single_occ_variables[nn] = false; |
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} |
289 |
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} |
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else |
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{ |
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std::unordered_map<Node, std::unordered_set<Node>>::iterator itf = |
293 |
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free_vars.find(nn); |
294 |
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Assert(itf != free_vars.end()); |
295 |
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for (std::unordered_set<Node>::iterator itfv = itf->second.begin(); |
296 |
10 |
itfv != itf->second.end(); |
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++itfv) |
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{ |
299 |
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single_occ_variables[*itfv] = false; |
300 |
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} |
301 |
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} |
302 |
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} |
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} |
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|
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// update constant argument information |
306 |
10 |
for (unsigned index = 0; index < ns.size(); index++) |
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{ |
308 |
10 |
Node n = ns[index]; |
309 |
10 |
Trace("sygus-process-arg-deps") |
310 |
5 |
<< " Analyze argument information for application #" << index << ": " |
311 |
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<< n << std::endl; |
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|
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// in the following, we say an argument a "carries" a term t if |
314 |
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// the function to synthesize would use argument a to construct |
315 |
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// the term t in its definition. |
316 |
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|
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// map that assumes all arguments carry their respective term |
318 |
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std::unordered_map<unsigned, Node> n_arg_map; |
319 |
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// terms to the argument that is carrying it. |
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// the arguments in the range of this map must be marked as relevant. |
321 |
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std::unordered_map<Node, unsigned> term_to_arg_carry; |
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// map of terms to (unprocessed) arguments where it occurs |
323 |
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std::unordered_map<Node, std::vector<unsigned>> term_to_args; |
324 |
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|
325 |
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// initialize |
326 |
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for (unsigned a = 0; a < n.getNumChildren(); a++) |
327 |
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{ |
328 |
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n_arg_map[a] = n[a]; |
329 |
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} |
330 |
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|
331 |
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for (unsigned a = 0; a < n.getNumChildren(); a++) |
332 |
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{ |
333 |
50 |
bool processed = false; |
334 |
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if (d_arg_props[a].d_relevant) |
335 |
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{ |
336 |
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// we can assume all relevant arguments carry their terms |
337 |
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processed = true; |
338 |
2 |
Trace("sygus-process-arg-deps") << " ...processed arg #" << a |
339 |
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<< " (already relevant)." << std::endl; |
340 |
1 |
if (term_to_arg_carry.find(n[a]) == term_to_arg_carry.end()) |
341 |
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{ |
342 |
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Trace("sygus-process-arg-deps") << " carry " << n[a] |
343 |
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<< " by argument #" << a << std::endl; |
344 |
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term_to_arg_carry[n[a]] = a; |
345 |
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} |
346 |
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} |
347 |
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else |
348 |
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{ |
349 |
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// first, check if single occurrence variable |
350 |
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// check if an irrelevant variable |
351 |
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if (n[a].isVar() && synth_fv.find(n[a]) != synth_fv.end()) |
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{ |
353 |
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Assert(single_occ_variables.find(n[a]) != single_occ_variables.end()); |
354 |
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// may be able to make this more precise? |
355 |
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// check if a single-occurrence variable |
356 |
43 |
if (single_occ_variables[n[a]]) |
357 |
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{ |
358 |
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// if we do not already have a template definition, or the |
359 |
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// template is a single occurrence variable |
360 |
54 |
if (d_arg_props[a].d_template.isNull() |
361 |
27 |
|| d_arg_props[a].d_var_single_occ) |
362 |
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{ |
363 |
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processed = true; |
364 |
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Trace("sygus-process-arg-deps") << " ...processed arg #" << a; |
365 |
54 |
Trace("sygus-process-arg-deps") |
366 |
27 |
<< " (single occurrence variable "; |
367 |
27 |
Trace("sygus-process-arg-deps") << n[a] << ")." << std::endl; |
368 |
27 |
d_arg_props[a].d_var_single_occ = true; |
369 |
27 |
d_arg_props[a].d_template = n[a]; |
370 |
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} |
371 |
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} |
372 |
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} |
373 |
120 |
if (!processed && !d_arg_props[a].d_template.isNull() |
374 |
58 |
&& !d_arg_props[a].d_var_single_occ) |
375 |
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{ |
376 |
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// argument already has a definition, see if it is maintained |
377 |
9 |
if (checkMatch(d_arg_props[a].d_template, n[a], n_arg_map)) |
378 |
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{ |
379 |
5 |
processed = true; |
380 |
5 |
Trace("sygus-process-arg-deps") << " ...processed arg #" << a; |
381 |
10 |
Trace("sygus-process-arg-deps") << " (consistent definition " |
382 |
5 |
<< n[a]; |
383 |
10 |
Trace("sygus-process-arg-deps") |
384 |
5 |
<< " with " << d_arg_props[a].d_template << ")." << std::endl; |
385 |
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} |
386 |
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} |
387 |
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} |
388 |
50 |
if (!processed) |
389 |
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{ |
390 |
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// otherwise, add it to the list of arguments for this term |
391 |
17 |
term_to_args[n[a]].push_back(a); |
392 |
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} |
393 |
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} |
394 |
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|
395 |
10 |
Trace("sygus-process-arg-deps") << " Look at argument terms..." |
396 |
5 |
<< std::endl; |
397 |
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|
398 |
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// list of all arguments |
399 |
10 |
std::vector<Node> arg_list; |
400 |
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// now look at the terms for unprocessed arguments |
401 |
8 |
for (std::unordered_map<Node, std::vector<unsigned>>::iterator it = |
402 |
5 |
term_to_args.begin(); |
403 |
13 |
it != term_to_args.end(); |
404 |
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++it) |
405 |
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{ |
406 |
16 |
Node nn = it->first; |
407 |
8 |
arg_list.push_back(nn); |
408 |
8 |
if (Trace.isOn("sygus-process-arg-deps")) |
409 |
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{ |
410 |
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Trace("sygus-process-arg-deps") << " argument " << nn; |
411 |
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Trace("sygus-process-arg-deps") << " (" << it->second.size() |
412 |
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<< " positions)"; |
413 |
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// check the status of this term |
414 |
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if (nn.isVar() && synth_fv.find(nn) != synth_fv.end()) |
415 |
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{ |
416 |
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// is it relevant? |
417 |
|
if (rlv_vars.find(nn) != rlv_vars.end()) |
418 |
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{ |
419 |
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Trace("sygus-process-arg-deps") << " is a relevant variable." |
420 |
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<< std::endl; |
421 |
|
} |
422 |
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else |
423 |
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{ |
424 |
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Trace("sygus-process-arg-deps") << " is an irrelevant variable." |
425 |
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<< std::endl; |
426 |
|
} |
427 |
|
} |
428 |
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else |
429 |
|
{ |
430 |
|
// this can be more precise |
431 |
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Trace("sygus-process-arg-deps") << " is a relevant term." |
432 |
|
<< std::endl; |
433 |
|
} |
434 |
|
} |
435 |
|
} |
436 |
|
|
437 |
5 |
unsigned arg_list_counter = 0; |
438 |
|
// sort arg_list by term size? |
439 |
|
|
440 |
17 |
while (arg_list_counter < arg_list.size()) |
441 |
|
{ |
442 |
12 |
Node infer_def_t; |
443 |
4 |
do |
444 |
|
{ |
445 |
10 |
infer_def_t = Node::null(); |
446 |
|
// see if we can infer a definition |
447 |
6 |
for (std::unordered_map<Node, std::vector<unsigned>>::iterator it = |
448 |
10 |
term_to_args.begin(); |
449 |
16 |
it != term_to_args.end(); |
450 |
|
++it) |
451 |
|
{ |
452 |
16 |
Node def = inferDefinition(it->first, term_to_arg_carry, free_vars); |
453 |
10 |
if (!def.isNull()) |
454 |
|
{ |
455 |
8 |
Trace("sygus-process-arg-deps") << " *** Inferred definition " |
456 |
4 |
<< def << " for " << it->first |
457 |
4 |
<< std::endl; |
458 |
|
// assign to each argument |
459 |
4 |
assignRelevantDef(def, it->second); |
460 |
|
// term_to_arg_carry[it->first] = rid; |
461 |
4 |
infer_def_t = it->first; |
462 |
4 |
break; |
463 |
|
} |
464 |
|
} |
465 |
10 |
if (!infer_def_t.isNull()) |
466 |
|
{ |
467 |
4 |
term_to_args.erase(infer_def_t); |
468 |
|
} |
469 |
10 |
} while (!infer_def_t.isNull()); |
470 |
|
|
471 |
|
// decide to make an argument relevant |
472 |
6 |
bool success = false; |
473 |
22 |
while (arg_list_counter < arg_list.size() && !success) |
474 |
|
{ |
475 |
16 |
Node curr = arg_list[arg_list_counter]; |
476 |
|
std::unordered_map<Node, std::vector<unsigned>>::iterator it = |
477 |
8 |
term_to_args.find(curr); |
478 |
8 |
if (it != term_to_args.end()) |
479 |
|
{ |
480 |
8 |
Trace("sygus-process-arg-deps") << " *** Decide relevant " << curr |
481 |
4 |
<< std::endl; |
482 |
|
// assign relevant to each |
483 |
8 |
Node null_def; |
484 |
4 |
unsigned rid = assignRelevantDef(null_def, it->second); |
485 |
4 |
term_to_arg_carry[curr] = rid; |
486 |
8 |
Trace("sygus-process-arg-deps") |
487 |
4 |
<< " carry " << curr << " by argument #" << rid << std::endl; |
488 |
4 |
term_to_args.erase(curr); |
489 |
4 |
success = true; |
490 |
|
} |
491 |
8 |
arg_list_counter++; |
492 |
|
} |
493 |
|
} |
494 |
|
} |
495 |
5 |
} |
496 |
|
|
497 |
|
bool SynthConjectureProcessFun::isArgRelevant(unsigned i) |
498 |
|
{ |
499 |
|
return d_arg_props[i].d_relevant; |
500 |
|
} |
501 |
|
|
502 |
4 |
void SynthConjectureProcessFun::getIrrelevantArgs( |
503 |
|
std::unordered_set<unsigned>& args) |
504 |
|
{ |
505 |
44 |
for (unsigned i = 0; i < d_arg_vars.size(); i++) |
506 |
|
{ |
507 |
40 |
if (!d_arg_props[i].d_relevant) |
508 |
|
{ |
509 |
34 |
args.insert(i); |
510 |
|
} |
511 |
|
} |
512 |
4 |
} |
513 |
|
|
514 |
1151 |
SynthConjectureProcess::SynthConjectureProcess() {} |
515 |
1151 |
SynthConjectureProcess::~SynthConjectureProcess() {} |
516 |
331 |
Node SynthConjectureProcess::preSimplify(Node q) |
517 |
|
{ |
518 |
331 |
Trace("sygus-process") << "Pre-simplify conjecture : " << q << std::endl; |
519 |
331 |
return q; |
520 |
|
} |
521 |
|
|
522 |
331 |
Node SynthConjectureProcess::postSimplify(Node q) |
523 |
|
{ |
524 |
331 |
Trace("sygus-process") << "Post-simplify conjecture : " << q << std::endl; |
525 |
331 |
Assert(q.getKind() == FORALL); |
526 |
|
|
527 |
662 |
if (options::sygusArgRelevant()) |
528 |
|
{ |
529 |
|
// initialize the information about each function to synthesize |
530 |
7 |
for (unsigned i = 0, size = q[0].getNumChildren(); i < size; i++) |
531 |
|
{ |
532 |
8 |
Node f = q[0][i]; |
533 |
4 |
if (f.getType().isFunction()) |
534 |
|
{ |
535 |
4 |
d_sf_info[f].init(f); |
536 |
|
} |
537 |
|
} |
538 |
|
|
539 |
|
// get the base on the conjecture |
540 |
6 |
Node base = q[1]; |
541 |
6 |
std::unordered_set<Node> synth_fv; |
542 |
3 |
if (base.getKind() == NOT && base[0].getKind() == FORALL) |
543 |
|
{ |
544 |
24 |
for (unsigned j = 0, size = base[0][0].getNumChildren(); j < size; j++) |
545 |
|
{ |
546 |
21 |
synth_fv.insert(base[0][0][j]); |
547 |
|
} |
548 |
3 |
base = base[0][1]; |
549 |
|
} |
550 |
6 |
std::vector<Node> conjuncts; |
551 |
3 |
getComponentVector(AND, base, conjuncts); |
552 |
|
|
553 |
|
// process the conjunctions |
554 |
4 |
for (std::map<Node, SynthConjectureProcessFun>::iterator it = |
555 |
3 |
d_sf_info.begin(); |
556 |
7 |
it != d_sf_info.end(); |
557 |
|
++it) |
558 |
|
{ |
559 |
8 |
Node f = it->first; |
560 |
11 |
for (const Node& conj : conjuncts) |
561 |
|
{ |
562 |
7 |
processConjunct(conj, f, synth_fv); |
563 |
|
} |
564 |
|
} |
565 |
|
} |
566 |
|
|
567 |
331 |
return q; |
568 |
|
} |
569 |
|
|
570 |
240 |
void SynthConjectureProcess::initialize(Node n, std::vector<Node>& candidates) |
571 |
|
{ |
572 |
240 |
if (Trace.isOn("sygus-process")) |
573 |
|
{ |
574 |
|
Trace("sygus-process") << "Process conjecture : " << n |
575 |
|
<< " with candidates: " << std::endl; |
576 |
|
for (unsigned i = 0; i < candidates.size(); i++) |
577 |
|
{ |
578 |
|
Trace("sygus-process") << " " << candidates[i] << std::endl; |
579 |
|
} |
580 |
|
} |
581 |
240 |
} |
582 |
|
|
583 |
|
bool SynthConjectureProcess::isArgRelevant(Node f, unsigned i) |
584 |
|
{ |
585 |
|
if (!options::sygusArgRelevant()) |
586 |
|
{ |
587 |
|
return true; |
588 |
|
} |
589 |
|
std::map<Node, SynthConjectureProcessFun>::iterator its = d_sf_info.find(f); |
590 |
|
if (its != d_sf_info.end()) |
591 |
|
{ |
592 |
|
return its->second.isArgRelevant(i); |
593 |
|
} |
594 |
|
Assert(false); |
595 |
|
return true; |
596 |
|
} |
597 |
|
|
598 |
300 |
bool SynthConjectureProcess::getIrrelevantArgs( |
599 |
|
Node f, std::unordered_set<unsigned>& args) |
600 |
|
{ |
601 |
300 |
std::map<Node, SynthConjectureProcessFun>::iterator its = d_sf_info.find(f); |
602 |
300 |
if (its != d_sf_info.end()) |
603 |
|
{ |
604 |
4 |
its->second.getIrrelevantArgs(args); |
605 |
4 |
return true; |
606 |
|
} |
607 |
296 |
return false; |
608 |
|
} |
609 |
|
|
610 |
7 |
void SynthConjectureProcess::processConjunct(Node n, |
611 |
|
Node f, |
612 |
|
std::unordered_set<Node>& synth_fv) |
613 |
|
{ |
614 |
7 |
Trace("sygus-process-arg-deps") << "Process conjunct: " << std::endl; |
615 |
14 |
Trace("sygus-process-arg-deps") << " " << n << " for synth fun " << f |
616 |
7 |
<< "..." << std::endl; |
617 |
|
|
618 |
|
// first, flatten the conjunct |
619 |
|
// make a copy of free variables since we may add new ones |
620 |
14 |
std::unordered_set<Node> synth_fv_n = synth_fv; |
621 |
14 |
std::unordered_map<Node, Node> defs; |
622 |
14 |
Node nf = flatten(n, f, synth_fv_n, defs); |
623 |
|
|
624 |
7 |
Trace("sygus-process-arg-deps") << "Flattened to: " << std::endl; |
625 |
7 |
Trace("sygus-process-arg-deps") << " " << nf << std::endl; |
626 |
|
|
627 |
|
// get free variables in nf |
628 |
14 |
std::unordered_map<Node, std::unordered_set<Node>> free_vars; |
629 |
7 |
getFreeVariables(nf, synth_fv_n, free_vars); |
630 |
|
// get free variables in each application |
631 |
14 |
std::vector<Node> ns; |
632 |
14 |
std::vector<Node> ks; |
633 |
12 |
for (std::unordered_map<Node, Node>::iterator it = defs.begin(); |
634 |
12 |
it != defs.end(); |
635 |
|
++it) |
636 |
|
{ |
637 |
5 |
getFreeVariables(it->second, synth_fv_n, free_vars); |
638 |
5 |
ns.push_back(it->second); |
639 |
5 |
ks.push_back(it->first); |
640 |
|
} |
641 |
|
|
642 |
|
// process the applications of synthesis functions |
643 |
7 |
if (!ns.empty()) |
644 |
|
{ |
645 |
5 |
std::map<Node, SynthConjectureProcessFun>::iterator its = d_sf_info.find(f); |
646 |
5 |
if (its != d_sf_info.end()) |
647 |
|
{ |
648 |
5 |
its->second.processTerms(ns, ks, nf, synth_fv_n, free_vars); |
649 |
|
} |
650 |
|
} |
651 |
7 |
} |
652 |
|
|
653 |
7 |
Node SynthConjectureProcess::SynthConjectureProcess::flatten( |
654 |
|
Node n, |
655 |
|
Node f, |
656 |
|
std::unordered_set<Node>& synth_fv, |
657 |
|
std::unordered_map<Node, Node>& defs) |
658 |
|
{ |
659 |
14 |
std::unordered_map<Node, Node> visited; |
660 |
7 |
std::unordered_map<Node, Node>::iterator it; |
661 |
14 |
std::stack<Node> visit; |
662 |
14 |
Node cur; |
663 |
7 |
visit.push(n); |
664 |
254 |
do |
665 |
|
{ |
666 |
261 |
cur = visit.top(); |
667 |
261 |
visit.pop(); |
668 |
261 |
it = visited.find(cur); |
669 |
|
|
670 |
261 |
if (it == visited.end()) |
671 |
|
{ |
672 |
118 |
visited[cur] = Node::null(); |
673 |
118 |
visit.push(cur); |
674 |
254 |
for (unsigned i = 0; i < cur.getNumChildren(); i++) |
675 |
|
{ |
676 |
136 |
visit.push(cur[i]); |
677 |
|
} |
678 |
|
} |
679 |
143 |
else if (it->second.isNull()) |
680 |
|
{ |
681 |
236 |
Node ret = cur; |
682 |
118 |
bool childChanged = false; |
683 |
236 |
std::vector<Node> children; |
684 |
118 |
if (cur.getMetaKind() == kind::metakind::PARAMETERIZED) |
685 |
|
{ |
686 |
7 |
children.push_back(cur.getOperator()); |
687 |
|
} |
688 |
254 |
for (unsigned i = 0; i < cur.getNumChildren(); i++) |
689 |
|
{ |
690 |
136 |
it = visited.find(cur[i]); |
691 |
136 |
Assert(it != visited.end()); |
692 |
136 |
Assert(!it->second.isNull()); |
693 |
136 |
childChanged = childChanged || cur[i] != it->second; |
694 |
136 |
children.push_back(it->second); |
695 |
|
} |
696 |
118 |
if (childChanged) |
697 |
|
{ |
698 |
19 |
ret = NodeManager::currentNM()->mkNode(cur.getKind(), children); |
699 |
|
} |
700 |
|
// is it the function to synthesize? |
701 |
118 |
if (cur.getKind() == APPLY_UF && cur.getOperator() == f) |
702 |
|
{ |
703 |
|
// if so, flatten |
704 |
10 |
Node k = NodeManager::currentNM()->mkBoundVar("vf", cur.getType()); |
705 |
5 |
defs[k] = ret; |
706 |
5 |
ret = k; |
707 |
5 |
synth_fv.insert(k); |
708 |
|
} |
709 |
|
// post-rewrite |
710 |
118 |
visited[cur] = ret; |
711 |
|
} |
712 |
261 |
} while (!visit.empty()); |
713 |
7 |
Assert(visited.find(n) != visited.end()); |
714 |
7 |
Assert(!visited.find(n)->second.isNull()); |
715 |
14 |
return visited[n]; |
716 |
|
} |
717 |
|
|
718 |
12 |
void SynthConjectureProcess::getFreeVariables( |
719 |
|
Node n, |
720 |
|
std::unordered_set<Node>& synth_fv, |
721 |
|
std::unordered_map<Node, std::unordered_set<Node>>& free_vars) |
722 |
|
{ |
723 |
|
// first must compute free variables in each subterm of n, |
724 |
|
// as well as contains_synth_fun |
725 |
24 |
std::unordered_map<Node, bool> visited; |
726 |
12 |
std::unordered_map<Node, bool>::iterator it; |
727 |
24 |
std::stack<Node> visit; |
728 |
24 |
Node cur; |
729 |
12 |
visit.push(n); |
730 |
266 |
do |
731 |
|
{ |
732 |
278 |
cur = visit.top(); |
733 |
278 |
visit.pop(); |
734 |
278 |
it = visited.find(cur); |
735 |
|
|
736 |
278 |
if (it == visited.end()) |
737 |
|
{ |
738 |
130 |
visited[cur] = false; |
739 |
130 |
visit.push(cur); |
740 |
266 |
for (unsigned i = 0; i < cur.getNumChildren(); i++) |
741 |
|
{ |
742 |
136 |
visit.push(cur[i]); |
743 |
|
} |
744 |
|
} |
745 |
148 |
else if (!it->second) |
746 |
|
{ |
747 |
130 |
free_vars[cur].clear(); |
748 |
130 |
if (synth_fv.find(cur) != synth_fv.end()) |
749 |
|
{ |
750 |
|
// it is a free variable |
751 |
62 |
free_vars[cur].insert(cur); |
752 |
|
} |
753 |
|
else |
754 |
|
{ |
755 |
|
// otherwise, carry the free variables from the children |
756 |
204 |
for (unsigned i = 0; i < cur.getNumChildren(); i++) |
757 |
|
{ |
758 |
272 |
free_vars[cur].insert(free_vars[cur[i]].begin(), |
759 |
272 |
free_vars[cur[i]].end()); |
760 |
|
} |
761 |
|
} |
762 |
130 |
visited[cur] = true; |
763 |
|
} |
764 |
278 |
} while (!visit.empty()); |
765 |
12 |
} |
766 |
|
|
767 |
9288 |
Node SynthConjectureProcess::getSymmetryBreakingPredicate( |
768 |
|
Node x, Node e, TypeNode tn, unsigned tindex, unsigned depth) |
769 |
|
{ |
770 |
9288 |
return Node::null(); |
771 |
|
} |
772 |
|
|
773 |
|
void SynthConjectureProcess::debugPrint(const char* c) {} |
774 |
3 |
void SynthConjectureProcess::getComponentVector(Kind k, |
775 |
|
Node n, |
776 |
|
std::vector<Node>& args) |
777 |
|
{ |
778 |
3 |
if (n.getKind() == k) |
779 |
|
{ |
780 |
6 |
for (unsigned i = 0; i < n.getNumChildren(); i++) |
781 |
|
{ |
782 |
4 |
args.push_back(n[i]); |
783 |
|
} |
784 |
|
} |
785 |
|
else |
786 |
|
{ |
787 |
1 |
args.push_back(n); |
788 |
|
} |
789 |
3 |
} |
790 |
|
|
791 |
|
} // namespace quantifiers |
792 |
|
} // namespace theory |
793 |
29617 |
} // namespace cvc5 |