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Merge pull request #1323 from c-cube/pp-proof-graphviz

print proofs in graphviz
This commit is contained in:
Nikolaj Bjorner 2017-10-24 03:28:04 -07:00 committed by GitHub
commit bce143b2b2
6 changed files with 187 additions and 0 deletions

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@ -10,6 +10,7 @@ z3_add_component(ast
ast_printer.cpp
ast_smt2_pp.cpp
ast_smt_pp.cpp
ast_pp_dot.cpp
ast_translation.cpp
ast_util.cpp
bv_decl_plugin.cpp

134
src/ast/ast_pp_dot.cpp Normal file
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@ -0,0 +1,134 @@
/*++
Abstract: Pretty-printer for proofs in Graphviz format
--*/
#include "util/util.h"
#include "util/map.h"
#include "ast_pp_dot.h"
// string escaping for DOT
std::string escape_dot(std::string const & s) {
std::string res;
res.reserve(s.size()); // preallocate
for (auto c : s) {
if (c == '\n')
res.append("\\l");
else
res.push_back(c);
}
return res;
}
// map from proofs to unique IDs
typedef obj_map<const expr, unsigned> expr2id;
typedef obj_map<const expr, bool> set_expr;
// temporary structure for traversing the proof and printing it
struct ast_pp_dot_st {
const ast_pp_dot * m_pp;
set_expr m_printed;
expr2id m_id_map;
svector<const expr *> m_to_print;
std::ostream & m_out;
unsigned m_next_id;
bool m_first;
ast_manager & m_manager;
ast_pp_dot_st(const ast_pp_dot * pp, std::ostream & out) :
m_pp(pp),
m_out(out),
m_next_id(0),
m_id_map(),
m_to_print(),
m_printed(),
m_first(true),
m_manager(pp->get_manager()) {}
~ast_pp_dot_st() = default;
void push_term(const expr * a) { m_to_print.push_back(a); }
void pp_loop() {
// DFS traversal
while (!m_to_print.empty()) {
const expr * a = m_to_print.back();
m_to_print.pop_back();
if (!m_printed.contains(a)) {
m_printed.insert(a, true);
if (m().is_proof(a))
pp_step(to_app(a));
else
pp_atomic_step(a);
}
}
}
private:
inline ast_manager & m() const { return m_manager; }
// label for an expression
std::string label_of_expr(const expr * e) const {
expr_ref er((expr*)e, m());
std::ostringstream out;
out << er << std::flush;
return escape_dot(out.str());
}
void pp_atomic_step(const expr * e) {
unsigned id = get_id(e);
m_out << "node_" << id << " [shape=box,color=\"yellow\",style=\"filled\",label=\"" << label_of_expr(e) << "\"] ;" << std::endl;
}
void pp_step(const proof * p) {
TRACE("pp_ast_dot_step", tout << " :kind " << p->get_kind() << " :num-args " << num_args);
if (m().has_fact(p)) {
// print result
expr* p_res = m().get_fact(p); // result of proof step
unsigned id = get_id(p);
unsigned num_parents = m().get_num_parents(p);
const char* color =
m_first ? (m_first=false,"color=\"red\"") : num_parents==0 ? "color=\"yellow\"": "";
m_out << "node_" << id <<
" [shape=box,style=\"filled\",label=\"" << label_of_expr(p_res) << "\""
<< color << "]" << std::endl;
// now print edges to parents (except last one, which is the result)
std::string label = p->get_decl()->get_name().str();
for (unsigned i = 0 ; i < num_parents; ++i) {
expr* parent = m().get_parent(p, i);
// explore parent, also print a link to it
push_term(to_app(parent));
m_out << "node_" << id << " -> " << "node_" << get_id((expr*)parent)
<< "[label=\"" << label << "\"];" << std::endl;;
}
} else {
pp_atomic_step(p);
}
}
// find a unique ID for this proof
unsigned get_id(const expr * e) {
unsigned id = 0;
if (!m_id_map.find(e, id)) {
id = m_next_id++;
m_id_map.insert(e, id);
}
return id;
}
};
// main printer
std::ostream & ast_pp_dot::pp(std::ostream & out) const {
out << "digraph proof { " << std::endl;
ast_pp_dot_st pp_st(this, out);
pp_st.push_term(m_pr);
pp_st.pp_loop();
out << std::endl << " } " << std::endl << std::flush;
return out;
}
std::ostream &operator<<(std::ostream &out, const ast_pp_dot & p) { return p.pp(out); }

24
src/ast/ast_pp_dot.h Normal file
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@ -0,0 +1,24 @@
/*++
Abstract: Pretty-printer for proofs in Graphviz format
--*/
#pragma once
#include <iostream>
#include "ast_pp.h"
class ast_pp_dot {
ast_manager & m_manager;
proof * const m_pr;
public:
ast_pp_dot(proof *pr, ast_manager &m) : m_manager(m), m_pr(pr) {}
ast_pp_dot(proof_ref &e) : m_manager(e.m()), m_pr(e.get()) {}
std::ostream & pp(std::ostream & out) const;
ast_manager & get_manager() const { return m_manager; }
};
std::ostream &operator<<(std::ostream &out, const ast_pp_dot & p);

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@ -20,6 +20,7 @@ Notes:
#include "util/version.h"
#include "ast/ast_smt_pp.h"
#include "ast/ast_smt2_pp.h"
#include "ast/ast_pp_dot.h"
#include "ast/ast_pp.h"
#include "ast/array_decl_plugin.h"
#include "ast/pp.h"
@ -202,6 +203,26 @@ ATOMIC_CMD(get_proof_cmd, "get-proof", "retrieve proof", {
}
});
ATOMIC_CMD(get_proof_graph_cmd, "get-proof-graph", "retrieve proof and print it in graphviz", {
if (!ctx.produce_proofs())
throw cmd_exception("proof construction is not enabled, use command (set-option :produce-proofs true)");
if (!ctx.has_manager() ||
ctx.cs_state() != cmd_context::css_unsat)
throw cmd_exception("proof is not available");
proof_ref pr(ctx.m());
pr = ctx.get_check_sat_result()->get_proof();
if (pr == 0)
throw cmd_exception("proof is not available");
if (ctx.well_sorted_check_enabled() && !is_well_sorted(ctx.m(), pr)) {
throw cmd_exception("proof is not well sorted");
}
context_params& params = ctx.params();
const std::string& file = params.m_dot_proof_file;
std::ofstream out(file);
out << ast_pp_dot(pr) << std::endl;
});
static void print_core(cmd_context& ctx) {
ptr_vector<expr> core;
ctx.get_check_sat_result()->get_unsat_core(core);
@ -840,6 +861,7 @@ void install_basic_cmds(cmd_context & ctx) {
ctx.insert(alloc(get_assignment_cmd));
ctx.insert(alloc(get_assertions_cmd));
ctx.insert(alloc(get_proof_cmd));
ctx.insert(alloc(get_proof_graph_cmd));
ctx.insert(alloc(get_unsat_core_cmd));
ctx.insert(alloc(set_option_cmd));
ctx.insert(alloc(get_option_cmd));

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@ -111,6 +111,9 @@ void context_params::set(char const * param, char const * value) {
else if (p == "trace_file_name") {
m_trace_file_name = value;
}
else if (p == "dot_proof_file") {
m_dot_proof_file = value;
}
else if (p == "unsat_core") {
set_bool(m_unsat_core, param, value);
}
@ -146,6 +149,7 @@ void context_params::updt_params(params_ref const & p) {
m_dump_models = p.get_bool("dump_models", m_dump_models);
m_trace = p.get_bool("trace", m_trace);
m_trace_file_name = p.get_str("trace_file_name", "z3.log");
m_dot_proof_file = p.get_str("dot_proof_file", "proof.dot");
m_unsat_core = p.get_bool("unsat_core", m_unsat_core);
m_debug_ref_count = p.get_bool("debug_ref_count", m_debug_ref_count);
m_smtlib2_compliant = p.get_bool("smtlib2_compliant", m_smtlib2_compliant);
@ -161,6 +165,7 @@ void context_params::collect_param_descrs(param_descrs & d) {
d.insert("dump_models", CPK_BOOL, "dump models whenever check-sat returns sat", "false");
d.insert("trace", CPK_BOOL, "trace generation for VCC", "false");
d.insert("trace_file_name", CPK_STRING, "trace out file name (see option 'trace')", "z3.log");
d.insert("dot_proof_file", CPK_STRING, "file in which to output graphical proofs", "proof.dot");
d.insert("debug_ref_count", CPK_BOOL, "debug support for AST reference counting", "false");
d.insert("smtlib2_compliant", CPK_BOOL, "enable/disable SMT-LIB 2.0 compliance", "false");
collect_solver_param_descrs(d);

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@ -30,6 +30,7 @@ class context_params {
public:
bool m_auto_config;
bool m_proof;
std::string m_dot_proof_file;
bool m_interpolants;
bool m_debug_ref_count;
bool m_trace;