cprover
single_path_symex_only_checker.cpp
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1 /*******************************************************************\
2 
3 Module: Goto Checker using Single Path Symbolic Execution only
4 
5 Author: Daniel Kroening, Peter Schrammel
6 
7 \*******************************************************************/
8 
11 
13 
14 #include <chrono>
15 
19 #include <goto-symex/show_vcc.h>
20 
21 #include "bmc_util.h"
22 #include "symex_bmc.h"
23 
25  const optionst &options,
26  ui_message_handlert &ui_message_handler,
27  abstract_goto_modelt &goto_model)
28  : incremental_goto_checkert(options, ui_message_handler),
29  goto_model(goto_model),
30  ns(goto_model.get_symbol_table(), symex_symbol_table),
31  worklist(get_path_strategy(options.get_option("exploration-strategy"))),
32  symex_runtime(0)
33 {
34 }
35 
37 operator()(propertiest &properties)
38 {
39  resultt result(resultt::progresst::DONE);
40 
42 
43  while(!has_finished_exploration(properties))
44  {
45  path_storaget::patht &path = worklist->peek();
46 
47  (void)resume_path(path);
48 
49  update_properties(properties, result.updated_properties, path.equation);
50 
51  worklist->pop();
52  }
53 
54  log.status() << "Runtime Symex: " << symex_runtime.count() << "s"
55  << messaget::eom;
56 
57  final_update_properties(properties, result.updated_properties);
58 
59  return result;
60 }
61 
63 {
64  // Put initial state into the work list
66  symex_bmct symex(
69  equation,
70  options,
71  *worklist,
73  setup_symex(symex);
74 
77 }
78 
80  const propertiest &properties)
81 {
82  return worklist->empty() ||
83  (!options.get_bool_option("paths-symex-explore-all") &&
84  !has_properties_to_check(properties));
85 }
86 
88 {
89  const auto symex_start = std::chrono::steady_clock::now();
90 
91  symex_bmct symex(
94  path.equation,
95  options,
96  *worklist,
98  setup_symex(symex);
99 
102  path.state,
103  &path.equation,
105 
106  const auto symex_stop = std::chrono::steady_clock::now();
107  symex_runtime += std::chrono::duration<double>(symex_stop - symex_start);
108 
110 
111  equation_output(symex, path.equation);
112 
113  return is_ready_to_decide(symex, path);
114 }
115 
117  const symex_bmct &,
118  const path_storaget::patht &)
119 {
120  // we don't check anything here
121  return false;
122 }
123 
125  const symex_bmct &symex,
126  const symex_target_equationt &equation)
127 {
129  options.get_option("symex-coverage-report"),
130  goto_model,
131  symex,
133 
134  if(options.get_bool_option("show-vcc"))
135  show_vcc(options, ui_message_handler, equation);
136 
137  if(options.get_bool_option("program-only"))
138  show_program(ns, equation);
139 
140  if(options.get_bool_option("show-byte-ops"))
142 
143  if(options.get_bool_option("validate-ssa-equation"))
144  {
146  }
147 }
148 
150 {
152 }
153 
155  propertiest &properties,
156  std::unordered_set<irep_idt> &updated_properties,
157  const symex_target_equationt &equation)
158 {
159  if(options.get_bool_option("symex-driven-lazy-loading"))
161 
163  properties, updated_properties, equation);
164 }
165 
167  propertiest &properties,
168  std::unordered_set<irep_idt> &updated_properties)
169 {
170  // For now, we assume that NOT_REACHED properties are PASS.
171  update_status_of_not_checked_properties(properties, updated_properties);
172 
173  // For now, we assume that UNKNOWN properties are PASS.
174  update_status_of_unknown_properties(properties, updated_properties);
175 }
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:305
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:289
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:237
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:273
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:321
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:844
An implementation of incremental_goto_checkert provides functionality for checking a set of propertie...
ui_message_handlert & ui_message_handler
mstreamt & status() const
Definition: message.h:414
static eomt eom
Definition: message.h:297
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 ...
Memory models for partial order concurrency.
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:174
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:73
std::unordered_map< irep_idt, property_infot > propertiest
A map of property IDs to property infos.
Definition: properties.h:75
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:169
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.