cprover
thread_instrumentation.cpp
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1 /*******************************************************************\
2 
3 Module:
4 
5 Author: Daniel Kroening, kroening@kroening.com
6 
7 \*******************************************************************/
8 
10 
11 #include <util/c_types.h>
12 #include <util/pointer_expr.h>
13 #include <util/string_constant.h>
14 
16 
17 static bool has_start_thread(const goto_programt &goto_program)
18 {
19  for(const auto &instruction : goto_program.instructions)
20  if(instruction.is_start_thread())
21  return true;
22 
23  return false;
24 }
25 
27 {
28  if(goto_program.instructions.empty())
29  return;
30 
31  // add assertion that all may flags for mutex-locked are gone
32  // at the end
33  goto_programt::targett end=goto_program.instructions.end();
34  end--;
35 
36  assert(end->is_end_function());
37 
38  source_locationt source_location = end->source_location();
39 
40  goto_program.insert_before_swap(end);
41 
42  const string_constantt mutex_locked_string("mutex-locked");
43 
44  // NULL is any
45  binary_predicate_exprt get_may{
47  ID_get_may,
48  address_of_exprt(mutex_locked_string)};
49 
50  *end = goto_programt::make_assertion(not_exprt(get_may), source_location);
51 
52  end->source_location_nonconst().set_comment(
53  "mutexes must not be locked on thread exit");
54 }
55 
57 {
58  // we'll look for START THREAD
59  std::set<irep_idt> thread_fkts;
60 
61  for(const auto &gf_entry : goto_model.goto_functions.function_map)
62  {
63  if(has_start_thread(gf_entry.second.body))
64  {
65  // now look for functions called
66 
67  for(const auto &instruction : gf_entry.second.body.instructions)
68  if(instruction.is_function_call())
69  {
70  const exprt &function = instruction.call_function();
71  if(function.id()==ID_symbol)
72  thread_fkts.insert(to_symbol_expr(function).get_identifier());
73  }
74  }
75  }
76 
77  // now instrument
78  for(const auto &fkt : thread_fkts)
80  goto_model.goto_functions.function_map[fkt].body);
81 }
82 
84  const symbol_tablet &symbol_table,
85  goto_programt &goto_program,
86  typet lock_type)
87 {
88  symbol_tablet::symbolst::const_iterator f_it =
89  symbol_table.symbols.find(CPROVER_PREFIX "set_must");
90 
91  if(f_it==symbol_table.symbols.end())
92  return;
93 
94  Forall_goto_program_instructions(it, goto_program)
95  {
96  if(it->is_assign())
97  {
98  if(it->assign_lhs().type() == lock_type)
99  {
100  const code_function_callt call(
101  f_it->second.symbol_expr(),
102  {address_of_exprt(it->assign_lhs()),
103  address_of_exprt(string_constantt("mutex-init"))});
104 
105  goto_program.insert_after(
107  }
108  }
109  }
110 }
111 
113 {
114  // get pthread_mutex_lock
115 
116  symbol_tablet::symbolst::const_iterator lock_entry =
117  goto_model.symbol_table.symbols.find("pthread_mutex_lock");
118 
119  if(lock_entry == goto_model.symbol_table.symbols.end())
120  return;
121 
122  // get type of lock argument
123  code_typet code_type = to_code_type(to_code_type(lock_entry->second.type));
124  if(code_type.parameters().size()!=1)
125  return;
126 
127  typet lock_type=code_type.parameters()[0].type();
128 
129  if(lock_type.id()!=ID_pointer)
130  return;
131 
132  for(auto &gf_entry : goto_model.goto_functions.function_map)
133  {
135  goto_model.symbol_table,
136  gf_entry.second.body,
137  to_pointer_type(lock_type).base_type());
138  }
139 }
void base_type(typet &type, const namespacet &ns)
Definition: base_type.cpp:109
pointer_typet pointer_type(const typet &subtype)
Definition: c_types.cpp:253
Operator to return the address of an object.
Definition: pointer_expr.h:361
A base class for expressions that are predicates, i.e., Boolean-typed, and that take exactly two argu...
Definition: std_expr.h:643
codet representation of a function call statement.
Base type of functions.
Definition: std_types.h:539
const parameterst & parameters() const
Definition: std_types.h:655
The empty type.
Definition: std_types.h:51
Base class for all expressions.
Definition: expr.h:54
const source_locationt & source_location() const
Definition: expr.h:230
function_mapt function_map
symbol_tablet symbol_table
Symbol table.
Definition: goto_model.h:30
goto_functionst goto_functions
GOTO functions.
Definition: goto_model.h:33
A generic container class for the GOTO intermediate representation of one function.
Definition: goto_program.h:73
instructionst instructions
The list of instructions in the goto program.
Definition: goto_program.h:598
void insert_before_swap(targett target)
Insertion that preserves jumps to "target".
Definition: goto_program.h:619
instructionst::iterator targett
Definition: goto_program.h:592
targett insert_after(const_targett target)
Insertion after the instruction pointed-to by the given instruction iterator target.
Definition: goto_program.h:684
static instructiont make_function_call(const code_function_callt &_code, const source_locationt &l=source_locationt::nil())
Create a function call instruction.
static instructiont make_assertion(const exprt &g, const source_locationt &l=source_locationt::nil())
Definition: goto_program.h:922
const irep_idt & id() const
Definition: irep.h:396
Boolean negation.
Definition: std_expr.h:2181
The null pointer constant.
Definition: pointer_expr.h:723
const symbolst & symbols
Read-only field, used to look up symbols given their names.
The symbol table.
Definition: symbol_table.h:14
The type of an expression, extends irept.
Definition: type.h:29
#define CPROVER_PREFIX
Symbol Table + CFG.
#define Forall_goto_program_instructions(it, program)
API to expression classes for Pointers.
const pointer_typet & to_pointer_type(const typet &type)
Cast a typet to a pointer_typet.
Definition: pointer_expr.h:79
static optionalt< smt_termt > get_identifier(const exprt &expr, const std::unordered_map< exprt, smt_identifier_termt, irep_hash > &expression_handle_identifiers, const std::unordered_map< exprt, smt_identifier_termt, irep_hash > &expression_identifiers)
const symbol_exprt & to_symbol_expr(const exprt &expr)
Cast an exprt to a symbol_exprt.
Definition: std_expr.h:189
const code_typet & to_code_type(const typet &type)
Cast a typet to a code_typet.
Definition: std_types.h:744
void thread_exit_instrumentation(goto_programt &goto_program)
void mutex_init_instrumentation(const symbol_tablet &symbol_table, goto_programt &goto_program, typet lock_type)
static bool has_start_thread(const goto_programt &goto_program)