cprover
single_path_symex_only_checker.cpp
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1/*******************************************************************\
2
3Module: Goto Checker using Single Path Symbolic Execution only
4
5Author: Daniel Kroening, Peter Schrammel
6
7\*******************************************************************/
8
11
13
14#include <chrono>
15
16#include <util/ui_message.h>
17
20#include <goto-symex/show_vcc.h>
21
22#include "bmc_util.h"
23#include "symex_bmc.h"
24
26 const optionst &options,
27 ui_message_handlert &ui_message_handler,
28 abstract_goto_modelt &goto_model)
29 : incremental_goto_checkert(options, ui_message_handler),
30 goto_model(goto_model),
31 ns(goto_model.get_symbol_table(), symex_symbol_table),
32 worklist(get_path_strategy(options.get_option("exploration-strategy"))),
33 symex_runtime(0),
34 unwindset(goto_model)
35{
36}
37
39operator()(propertiest &properties)
40{
41 resultt result(resultt::progresst::DONE);
42
44
45 while(!has_finished_exploration(properties))
46 {
47 path_storaget::patht &path = worklist->peek();
48
49 (void)resume_path(path);
50
51 update_properties(properties, result.updated_properties, path.equation);
52
53 worklist->pop();
54 }
55
56 log.status() << "Runtime Symex: " << symex_runtime.count() << "s"
58
60
61 return result;
62}
63
65{
66 // Put initial state into the work list
68 symex_bmct symex(
71 equation,
72 options,
73 *worklist,
75 unwindset);
76 setup_symex(symex);
77
80}
81
83 const propertiest &properties)
84{
85 return worklist->empty() ||
86 (!options.get_bool_option("paths-symex-explore-all") &&
87 !has_properties_to_check(properties));
88}
89
91{
92 const auto symex_start = std::chrono::steady_clock::now();
93
94 symex_bmct symex(
97 path.equation,
98 options,
99 *worklist,
101 unwindset);
102 setup_symex(symex);
103
106 path.state,
107 &path.equation,
109
110 const auto symex_stop = std::chrono::steady_clock::now();
111 symex_runtime += std::chrono::duration<double>(symex_stop - symex_start);
112
114
115 equation_output(symex, path.equation);
116
117 return is_ready_to_decide(symex, path);
118}
119
121 const symex_bmct &,
122 const path_storaget::patht &)
123{
124 // we don't check anything here
125 return false;
126}
127
129 const symex_bmct &symex,
130 const symex_target_equationt &equation)
131{
133 options.get_option("symex-coverage-report"),
135 symex,
137
138 if(options.get_bool_option("show-vcc"))
140
141 if(options.get_bool_option("program-only"))
142 show_program(ns, equation);
143
144 if(options.get_bool_option("show-byte-ops"))
146
147 if(options.get_bool_option("validate-ssa-equation"))
148 {
150 }
151}
152
154{
156}
157
159 propertiest &properties,
160 std::unordered_set<irep_idt> &updated_properties,
161 const symex_target_equationt &equation)
162{
163 if(options.get_bool_option("symex-driven-lazy-loading"))
165
167 properties, updated_properties, equation);
168}
169
171 propertiest &properties,
172 std::unordered_set<irep_idt> &updated_properties)
173{
174 // For now, we assume that NOT_REACHED properties are PASS.
175 update_status_of_not_checked_properties(properties, updated_properties);
176
177 // For now, we assume that UNKNOWN properties are PASS.
178 update_status_of_unknown_properties(properties, updated_properties);
179}
void output_coverage_report(const std::string &cov_out, const abstract_goto_modelt &goto_model, const symex_bmct &symex, ui_message_handlert &ui_message_handler)
Output a coverage report as generated by symex_coveraget if cov_out is non-empty.
Definition: bmc_util.cpp:307
void update_status_of_unknown_properties(propertiest &properties, std::unordered_set< irep_idt > &updated_properties)
Sets the property status of UNKNOWN properties to PASS.
Definition: bmc_util.cpp:291
void update_properties_status_from_symex_target_equation(propertiest &properties, std::unordered_set< irep_idt > &updated_properties, const symex_target_equationt &equation)
Sets property status to PASS for properties whose conditions are constant true in the equation.
Definition: bmc_util.cpp:239
void update_status_of_not_checked_properties(propertiest &properties, std::unordered_set< irep_idt > &updated_properties)
Sets the property status of NOT_CHECKED properties to PASS.
Definition: bmc_util.cpp:275
void postprocess_equation(symex_bmct &symex, symex_target_equationt &equation, const optionst &options, const namespacet &ns, ui_message_handlert &ui_message_handler)
Post process the equation.
Definition: bmc_util.cpp:323
Bounded Model Checking Utilities.
Abstract interface to eager or lazy GOTO models.
virtual const symbol_tablet & get_symbol_table() const =0
Accessor to get the symbol table.
static get_goto_functiont get_goto_function(abstract_goto_modelt &goto_model)
Return a function to get/load a goto function from the given goto model Create a default delegate to ...
Definition: symex_main.cpp:493
virtual void initialize_path_storage_from_entry_point_of(const get_goto_functiont &get_goto_function, symbol_tablet &new_symbol_table)
Puts the initial state of the entry point function into the path storage.
Definition: symex_main.cpp:479
virtual void resume_symex_from_saved_state(const get_goto_functiont &get_goto_function, const statet &saved_state, symex_target_equationt *saved_equation, symbol_tablet &new_symbol_table)
Performs symbolic execution using a state and equation that have already been used to symbolically ex...
Definition: symex_main.cpp:382
void validate(const validation_modet vm) const
Definition: goto_symex.h:835
An implementation of incremental_goto_checkert provides functionality for checking a set of propertie...
ui_message_handlert & ui_message_handler
static eomt eom
Definition: message.h:297
mstreamt & status() const
Definition: message.h:414
bool get_bool_option(const std::string &option) const
Definition: options.cpp:44
const std::string get_option(const std::string &option) const
Definition: options.cpp:67
virtual bool is_ready_to_decide(const symex_bmct &symex, const path_storaget::patht &path)
Returns whether the given path produced by symex is ready to be checked.
virtual void final_update_properties(propertiest &properties, std::unordered_set< irep_idt > &updated_properties)
Updates the properties after having finished exploration and adds their property IDs to updated_prope...
virtual void initialize_worklist()
Adds the initial goto-symex state as a path to the worklist.
std::chrono::duration< double > symex_runtime
std::unique_ptr< path_storaget > worklist
virtual void update_properties(propertiest &properties, std::unordered_set< irep_idt > &updated_properties, const symex_target_equationt &equation)
Updates the properties from the equation and adds their property IDs to updated_properties.
single_path_symex_only_checkert(const optionst &options, ui_message_handlert &ui_message_handler, abstract_goto_modelt &goto_model)
virtual bool resume_path(path_storaget::patht &path)
Continues exploring the given path using goto-symex.
virtual bool has_finished_exploration(const propertiest &)
Returns whether we should stop exploring paths.
virtual void setup_symex(symex_bmct &symex)
void equation_output(const symex_bmct &symex, const symex_target_equationt &equation)
resultt operator()(propertiest &) override
Check whether the given properties with status NOT_CHECKED, UNKNOWN or properties newly discovered by...
Inheriting the interface of symex_targett this class represents the SSA form of the input program as ...
std::unique_ptr< path_storaget > get_path_strategy(const std::string strategy)
Ensure that is_valid_strategy() returns true for a particular string before calling this function on ...
Storage of symbolic execution paths to resume.
bool has_properties_to_check(const propertiest &properties)
Return true if there as a property with NOT_CHECKED or UNKNOWN status.
Definition: properties.cpp:177
void update_properties_from_goto_model(propertiest &properties, const abstract_goto_modelt &goto_model)
Updates properties with the assertions in goto_model.
Definition: properties.cpp:75
std::map< irep_idt, property_infot > propertiest
A map of property IDs to property infos.
Definition: properties.h:76
void show_program(const namespacet &ns, const symex_target_equationt &equation)
Print the steps of equation on the standard output.
void show_byte_ops(const optionst &options, ui_message_handlert &ui_message_handler, const namespacet &ns, const symex_target_equationt &equation)
Count and display all byte extract and byte update operations from equation on standard output or fil...
Output of the program (SSA) constraints.
void show_vcc(const optionst &options, ui_message_handlert &ui_message_handler, const symex_target_equationt &equation)
Output equations from equation to a file or to the standard output.
Definition: show_vcc.cpp:167
Output of the verification conditions (VCCs)
Goto Checker using Single Path Symbolic Execution only.
std::unordered_set< irep_idt > updated_properties
Changed properties since the last call to incremental_goto_checkert::operator()
Information saved at a conditional goto to resume execution.
Definition: path_storage.h:42
symex_target_equationt equation
Definition: path_storage.h:43
goto_symex_statet state
Definition: path_storage.h:44
Bounded Model Checking for ANSI-C.