CBMC
string_abstraction.h
Go to the documentation of this file.
1 /*******************************************************************\
2 
3 Module: String Abstraction
4 
5 Author: Daniel Kroening, kroening@kroening.com
6 
7 \*******************************************************************/
8 
11 
12 #ifndef CPROVER_GOTO_PROGRAMS_STRING_ABSTRACTION_H
13 #define CPROVER_GOTO_PROGRAMS_STRING_ABSTRACTION_H
14 
15 #include <util/bitvector_types.h>
16 #include <util/config.h>
17 #include <util/namespace.h>
18 #include <util/std_expr.h>
19 
20 #include "goto_function.h"
21 
22 #include <map>
23 
24 class goto_modelt;
25 class message_handlert;
26 
33 {
34 public:
40  message_handlert &_message_handler);
41 
42  void apply();
43 
44 protected:
45  std::string sym_suffix;
50 
51  typedef ::std::map< typet, typet > abstraction_types_mapt;
53 
54  void apply(goto_programt &dest);
55 
56  static bool has_string_macros(const exprt &expr);
57 
59  exprt &expr,
60  bool lhs,
61  const source_locationt &);
62 
63  void move_lhs_arithmetic(exprt &lhs, exprt &rhs);
64 
65  bool is_char_type(const typet &type) const
66  {
67  if(type.id()!=ID_signedbv &&
68  type.id()!=ID_unsignedbv)
69  return false;
70 
72  }
73 
74  bool is_ptr_string_struct(const typet &type) const;
75 
76  void make_type(exprt &dest, const typet &type)
77  {
78  if(dest.is_not_nil() &&
79  ns.follow(dest.type())!=ns.follow(type))
80  dest = typecast_exprt(dest, type);
81  }
82 
83  goto_programt::targett abstract(
91 
93  goto_programt &dest,
95  const exprt &new_lhs,
96  const exprt &lhs,
97  const exprt &rhs);
98 
100 
103  const exprt &lhs, const exprt &rhs);
104 
106  goto_programt &dest,
107  goto_programt::targett target,
108  const exprt &lhs, const if_exprt &rhs);
109 
111  goto_programt &dest,
112  goto_programt::targett target,
113  const exprt &lhs, const exprt &rhs);
114 
115  enum class whatt { IS_ZERO, LENGTH, SIZE };
116 
117  static typet build_type(whatt what);
118  exprt build(
119  const exprt &pointer,
120  whatt what,
121  bool write,
122  const source_locationt &);
123 
124  bool build(const exprt &object, exprt &dest, bool write);
125  bool build_wrap(const exprt &object, exprt &dest, bool write);
126  bool build_if(const if_exprt &o_if, exprt &dest, bool write);
127  bool build_array(const array_exprt &object, exprt &dest, bool write);
128  bool build_symbol(const symbol_exprt &sym, exprt &dest);
129  bool build_symbol_constant(const mp_integer &zero_length,
130  const mp_integer &buf_size, exprt &dest);
131 
132  exprt build_unknown(whatt what, bool write);
133  exprt build_unknown(const typet &type, bool write);
134  const typet &build_abstraction_type(const typet &type);
135  const typet &build_abstraction_type_rec(const typet &type,
136  const abstraction_types_mapt &known);
137  bool build_pointer(const exprt &object, exprt &dest, bool write);
138  void build_new_symbol(const symbolt &symbol,
139  const irep_idt &identifier, const typet &type);
140 
141  exprt member(const exprt &a, whatt what);
142 
145 
146  typedef std::unordered_map<irep_idt, irep_idt> localst;
149 
150  void abstract(goto_programt &dest);
151 
152  void add_str_parameters(
153  symbolt &fct_symbol,
154  goto_functiont::parameter_identifierst &parameter_identifiers);
155 
157  const symbolt &fct_symbol,
158  const typet &type,
159  const irep_idt &identifier);
160 
162  const irep_idt &identifier, const irep_idt &source_sym);
163 
165  goto_programt::targett ref_instr,
166  const symbolt &symbol, const typet &source_type);
167 
169  goto_programt &dest,
170  goto_programt::targett ref_instr,
171  const symbolt &symbol,
172  const irep_idt &component_name,
173  const typet &type,
174  const typet &source_type);
175 
177 };
178 
179 // keep track of length of strings
180 
181 void string_abstraction(
182  goto_modelt &,
183  message_handlert &);
184 
185 #endif // CPROVER_GOTO_PROGRAMS_STRING_ABSTRACTION_H
configt config
Definition: config.cpp:25
Pre-defined bitvector types.
const bitvector_typet & to_bitvector_type(const typet &type)
Cast a typet to a bitvector_typet.
Array constructor from list of elements.
Definition: std_expr.h:1616
std::size_t get_width() const
Definition: std_types.h:920
struct configt::ansi_ct ansi_c
dstringt has one field, an unsigned integer no which is an index into a static table of strings.
Definition: dstring.h:38
Base class for all expressions.
Definition: expr.h:56
typet & type()
Return the type of the expression.
Definition: expr.h:84
std::vector< irep_idt > parameter_identifierst
Definition: goto_function.h:28
A generic container class for the GOTO intermediate representation of one function.
Definition: goto_program.h:73
instructionst::iterator targett
Definition: goto_program.h:614
The trinary if-then-else operator.
Definition: std_expr.h:2370
bool is_not_nil() const
Definition: irep.h:368
const irep_idt & id() const
Definition: irep.h:384
const typet & follow(const typet &) const
Resolve type symbol to the type it points to.
Definition: namespace.cpp:49
A namespacet is essentially one or two symbol tables bound together, to allow for symbol lookups in t...
Definition: namespace.h:94
Replace all uses of char * by a struct that carries that string, and also the underlying allocation a...
goto_programt::targett value_assignments_if(goto_programt &dest, goto_programt::targett target, const exprt &lhs, const if_exprt &rhs)
goto_programt::targett value_assignments_string_struct(goto_programt &dest, goto_programt::targett target, const exprt &lhs, const exprt &rhs)
void declare_define_locals(goto_programt &dest)
goto_modelt & goto_model
exprt make_val_or_dummy_rec(goto_programt &dest, goto_programt::targett ref_instr, const symbolt &symbol, const typet &source_type)
bool build_symbol_constant(const mp_integer &zero_length, const mp_integer &buf_size, exprt &dest)
goto_programt::targett abstract_assign(goto_programt &dest, goto_programt::targett it)
static typet build_type(whatt what)
goto_programt::targett abstract_pointer_assign(goto_programt &dest, goto_programt::targett it)
bool build_if(const if_exprt &o_if, exprt &dest, bool write)
const typet & build_abstraction_type_rec(const typet &type, const abstraction_types_mapt &known)
void replace_string_macros(exprt &expr, bool lhs, const source_locationt &)
exprt build_unknown(whatt what, bool write)
string_abstractiont(goto_modelt &goto_model, message_handlert &_message_handler)
Apply string abstraction to goto_model.
void build_new_symbol(const symbolt &symbol, const irep_idt &identifier, const typet &type)
bool is_ptr_string_struct(const typet &type) const
message_handlert & message_handler
::std::map< typet, typet > abstraction_types_mapt
std::unordered_map< irep_idt, irep_idt > localst
goto_programt initialization
goto_programt::targett value_assignments(goto_programt &dest, goto_programt::targett it, const exprt &lhs, const exprt &rhs)
symbol_exprt add_dummy_symbol_and_value(goto_programt &dest, goto_programt::targett ref_instr, const symbolt &symbol, const irep_idt &component_name, const typet &type, const typet &source_type)
bool build_wrap(const exprt &object, exprt &dest, bool write)
goto_programt::targett abstract_char_assign(goto_programt &dest, goto_programt::targett it)
bool build_array(const array_exprt &object, exprt &dest, bool write)
bool build_symbol(const symbol_exprt &sym, exprt &dest)
void move_lhs_arithmetic(exprt &lhs, exprt &rhs)
abstraction_types_mapt abstraction_types_map
goto_programt::targett char_assign(goto_programt &dest, goto_programt::targett target, const exprt &new_lhs, const exprt &lhs, const exprt &rhs)
code_typet::parametert add_parameter(const symbolt &fct_symbol, const typet &type, const irep_idt &identifier)
bool build_pointer(const exprt &object, exprt &dest, bool write)
void abstract_function_call(goto_programt::targett it)
exprt member(const exprt &a, whatt what)
static bool has_string_macros(const exprt &expr)
void make_type(exprt &dest, const typet &type)
exprt build(const exprt &pointer, whatt what, bool write, const source_locationt &)
void make_decl_and_def(goto_programt &dest, goto_programt::targett ref_instr, const irep_idt &identifier, const irep_idt &source_sym)
void add_str_parameters(symbolt &fct_symbol, goto_functiont::parameter_identifierst &parameter_identifiers)
bool is_char_type(const typet &type) const
const typet & build_abstraction_type(const typet &type)
Expression to hold a symbol (variable)
Definition: std_expr.h:131
Symbol table entry.
Definition: symbol.h:28
Semantic type conversion.
Definition: std_expr.h:2068
The type of an expression, extends irept.
Definition: type.h:29
Goto Function.
BigInt mp_integer
Definition: smt_terms.h:17
API to expression classes.
void string_abstraction(goto_modelt &, message_handlert &)
std::size_t char_width
Definition: config.h:140
ssize_t write(int fildes, const void *buf, size_t nbyte)
Definition: unistd.c:195