cprover
object_id.cpp
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1 /*******************************************************************\
2 
3 Module: Object Identifiers
4 
5 Author: Daniel Kroening, kroening@kroening.com
6 
7 \*******************************************************************/
8 
11 
12 #include "object_id.h"
13 
14 #include <util/pointer_expr.h>
15 
16 enum class get_modet { LHS_R, LHS_W, READ };
17 
19  get_modet mode,
20  const exprt &expr,
21  object_id_sett &dest,
22  const std::string &suffix)
23 {
24  if(expr.id()==ID_symbol)
25  {
26  if(mode==get_modet::LHS_W || mode==get_modet::READ)
27  dest.insert(object_idt(to_symbol_expr(expr)));
28  }
29  else if(expr.id()==ID_index)
30  {
31  const index_exprt &index_expr=to_index_expr(expr);
32 
33  if(mode==get_modet::LHS_R || mode==get_modet::READ)
34  get_objects_rec(get_modet::READ, index_expr.index(), dest, "");
35 
36  if(mode==get_modet::LHS_R)
37  get_objects_rec(get_modet::READ, index_expr.array(), dest, "[]"+suffix);
38  else
39  get_objects_rec(mode, index_expr.array(), dest, "[]"+suffix);
40  }
41  else if(expr.id()==ID_if)
42  {
43  const if_exprt &if_expr=to_if_expr(expr);
44 
45  if(mode==get_modet::LHS_R || mode==get_modet::READ)
46  get_objects_rec(get_modet::READ, if_expr.cond(), dest, "");
47 
48  get_objects_rec(mode, if_expr.true_case(), dest, suffix);
49  get_objects_rec(mode, if_expr.false_case(), dest, suffix);
50  }
51  else if(expr.id()==ID_member)
52  {
53  const member_exprt &member_expr=to_member_expr(expr);
54 
55  get_objects_rec(mode, member_expr.struct_op(), dest,
56  "."+id2string(member_expr.get_component_name())+suffix);
57  }
58  else if(expr.id()==ID_dereference)
59  {
60  const dereference_exprt &dereference_expr=
61  to_dereference_expr(expr);
62 
63  if(mode==get_modet::LHS_R || mode==get_modet::READ)
64  get_objects_rec(get_modet::READ, dereference_expr.pointer(), dest, "");
65  }
66  else
67  {
68  if(mode==get_modet::LHS_R || mode==get_modet::READ)
69  forall_operands(it, expr)
70  get_objects_rec(get_modet::READ, *it, dest, "");
71  }
72 }
73 
74 void get_objects(const exprt &expr, object_id_sett &dest)
75 {
76  get_objects_rec(get_modet::READ, expr, dest, "");
77 }
78 
79 void get_objects_r(const code_assignt &assign, object_id_sett &dest)
80 {
81  get_objects_rec(get_modet::LHS_R, assign.lhs(), dest, "");
82  get_objects_rec(get_modet::READ, assign.rhs(), dest, "");
83 }
84 
85 void get_objects_w(const code_assignt &assign, object_id_sett &dest)
86 {
87  get_objects_rec(get_modet::LHS_W, assign.lhs(), dest, "");
88 }
89 
90 void get_objects_w(const exprt &lhs, object_id_sett &dest)
91 {
92  get_objects_rec(get_modet::LHS_W, lhs, dest, "");
93 }
94 
95 void get_objects_r_lhs(const exprt &lhs, object_id_sett &dest)
96 {
97  get_objects_rec(get_modet::LHS_R, lhs, dest, "");
98 }
A codet representing an assignment in the program.
Definition: std_code.h:295
exprt & rhs()
Definition: std_code.h:317
exprt & lhs()
Definition: std_code.h:312
Operator to dereference a pointer.
Definition: pointer_expr.h:256
Base class for all expressions.
Definition: expr.h:54
The trinary if-then-else operator.
Definition: std_expr.h:2087
exprt & true_case()
Definition: std_expr.h:2114
exprt & false_case()
Definition: std_expr.h:2124
exprt & cond()
Definition: std_expr.h:2104
Array index operator.
Definition: std_expr.h:1243
exprt & array()
Definition: std_expr.h:1259
exprt & index()
Definition: std_expr.h:1269
const irep_idt & id() const
Definition: irep.h:407
Extract member of struct or union.
Definition: std_expr.h:2528
const exprt & struct_op() const
Definition: std_expr.h:2558
irep_idt get_component_name() const
Definition: std_expr.h:2542
#define forall_operands(it, expr)
Definition: expr.h:18
const std::string & id2string(const irep_idt &d)
Definition: irep.h:49
get_modet
Definition: object_id.cpp:16
void get_objects_r_lhs(const exprt &lhs, object_id_sett &dest)
Definition: object_id.cpp:95
void get_objects(const exprt &expr, object_id_sett &dest)
Definition: object_id.cpp:74
void get_objects_r(const code_assignt &assign, object_id_sett &dest)
Definition: object_id.cpp:79
void get_objects_rec(get_modet mode, const exprt &expr, object_id_sett &dest, const std::string &suffix)
Definition: object_id.cpp:18
void get_objects_w(const code_assignt &assign, object_id_sett &dest)
Definition: object_id.cpp:85
Object Identifiers.
std::set< object_idt > object_id_sett
Definition: object_id.h:57
API to expression classes for Pointers.
const dereference_exprt & to_dereference_expr(const exprt &expr)
Cast an exprt to a dereference_exprt.
Definition: pointer_expr.h:312
const if_exprt & to_if_expr(const exprt &expr)
Cast an exprt to an if_exprt.
Definition: std_expr.h:2152
const symbol_exprt & to_symbol_expr(const exprt &expr)
Cast an exprt to a symbol_exprt.
Definition: std_expr.h:190
const member_exprt & to_member_expr(const exprt &expr)
Cast an exprt to a member_exprt.
Definition: std_expr.h:2612
const index_exprt & to_index_expr(const exprt &expr)
Cast an exprt to an index_exprt.
Definition: std_expr.h:1297