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namespace.cpp
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1/*******************************************************************\
2
3Module: Namespace
4
5Author: Daniel Kroening, kroening@kroening.com
6
7\*******************************************************************/
8
11
12#include "namespace.h"
13
14#include "c_types.h"
15#include "std_expr.h"
16#include "symbol_table_base.h"
17
18#include <algorithm>
19
23
31{
32 return lookup(expr.get_identifier());
33}
34
41const symbolt &namespace_baset::lookup(const tag_typet &type) const
42{
43 return lookup(type.get_identifier());
44}
45
49const typet &namespace_baset::follow(const typet &src) const
50{
51 if(src.id() == ID_union_tag)
52 return follow_tag(to_union_tag_type(src));
53
54 if(src.id() == ID_struct_tag)
55 return follow_tag(to_struct_tag_type(src));
56
57 return src;
64{
65 const symbolt &symbol=lookup(src.get_identifier());
66 CHECK_RETURN(symbol.is_type);
67 CHECK_RETURN(symbol.type.id() == ID_union);
68 return to_union_type(symbol.type);
69}
70
74const struct_typet &
76{
77 const symbolt &symbol=lookup(src.get_identifier());
78 CHECK_RETURN(symbol.is_type);
79 CHECK_RETURN(symbol.type.id() == ID_struct);
80 return to_struct_type(symbol.type);
81}
82
86const c_enum_typet &
88{
89 const symbolt &symbol=lookup(src.get_identifier());
90 CHECK_RETURN(symbol.is_type);
91 CHECK_RETURN(symbol.type.id() == ID_c_enum);
92 return to_c_enum_type(symbol.type);
93}
94
98{
99 const symbolt &symbol = lookup(src.get_identifier());
100 CHECK_RETURN(symbol.is_type);
101 CHECK_RETURN(symbol.type.id() == ID_struct || symbol.type.id() == ID_union);
102 return to_struct_union_type(symbol.type);
103}
104
108{
109 if(expr.id()==ID_symbol)
110 {
111 const symbolt &symbol = lookup(to_symbol_expr(expr));
112
113 if(symbol.is_macro && !symbol.value.is_nil())
114 {
115 expr=symbol.value;
116 follow_macros(expr);
117 }
118
119 return;
120 }
121
122 Forall_operands(it, expr)
123 follow_macros(*it);
124}
125
130std::size_t namespacet::smallest_unused_suffix(const std::string &prefix) const
131{
132 std::size_t m = 0;
133
134 if(symbol_table1!=nullptr)
135 m = std::max(m, symbol_table1->next_unused_suffix(prefix));
136
137 if(symbol_table2!=nullptr)
138 m = std::max(m, symbol_table2->next_unused_suffix(prefix));
139
140 return m;
141}
142
149 const irep_idt &name,
150 const symbolt *&symbol) const
151{
152 symbol_table_baset::symbolst::const_iterator it;
153
154 if(symbol_table1!=nullptr)
155 {
156 it=symbol_table1->symbols.find(name);
157
158 if(it!=symbol_table1->symbols.end())
159 {
160 symbol=&(it->second);
161 return false;
162 }
163 }
164
165 if(symbol_table2!=nullptr)
166 {
167 it=symbol_table2->symbols.find(name);
168
169 if(it!=symbol_table2->symbols.end())
170 {
171 symbol=&(it->second);
172 return false;
173 }
174 }
175
176 return true;
177}
178
182std::size_t
183multi_namespacet::smallest_unused_suffix(const std::string &prefix) const
184{
185 std::size_t m = 0;
186
187 for(const auto &st : symbol_table_list)
188 m = std::max(m, st->next_unused_suffix(prefix));
189
190 return m;
191}
192
200 const irep_idt &name,
201 const symbolt *&symbol) const
202{
203 symbol_table_baset::symbolst::const_iterator s_it;
204
205 for(symbol_table_listt::const_iterator
206 c_it=symbol_table_list.begin();
207 c_it!=symbol_table_list.end();
208 c_it++)
209 {
210 s_it=(*c_it)->symbols.find(name);
211
212 if(s_it!=(*c_it)->symbols.end())
213 {
214 symbol=&(s_it->second);
215 return false;
216 }
217 }
218
219 return true;
220}
const c_enum_typet & to_c_enum_type(const typet &type)
Cast a typet to a c_enum_typet.
Definition c_types.h:335
const union_typet & to_union_type(const typet &type)
Cast a typet to a union_typet.
Definition c_types.h:184
const union_tag_typet & to_union_tag_type(const typet &type)
Cast a typet to a union_tag_typet.
Definition c_types.h:224
C enum tag type, i.e., c_enum_typet with an identifier.
Definition c_types.h:352
The type of C enums.
Definition c_types.h:239
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
const irep_idt & id() const
Definition irep.h:388
bool is_nil() const
Definition irep.h:368
bool lookup(const irep_idt &name, const symbolt *&symbol) const override
See documentation for namespace_baset::lookup().
std::size_t smallest_unused_suffix(const std::string &prefix) const override
See documentation for namespace_baset::smallest_unused_suffix().
symbol_table_listt symbol_table_list
Definition namespace.h:172
const typet & follow(const typet &) const
Resolve type symbol to the type it points to.
Definition namespace.cpp:49
const symbolt & lookup(const irep_idt &name) const
Lookup a symbol in the namespace.
Definition namespace.h:46
void follow_macros(exprt &) const
Follow macros to their values in a given expression.
const union_typet & follow_tag(const union_tag_typet &) const
Follow type tag of union type.
Definition namespace.cpp:63
virtual ~namespace_baset()
Definition namespace.cpp:20
const symbol_table_baset * symbol_table1
Definition namespace.h:132
bool lookup(const irep_idt &name, const symbolt *&symbol) const override
See documentation for namespace_baset::lookup().
const symbol_table_baset * symbol_table2
Definition namespace.h:132
std::size_t smallest_unused_suffix(const std::string &prefix) const override
See documentation for namespace_baset::smallest_unused_suffix().
A struct or union tag type.
Definition std_types.h:451
A struct tag type, i.e., struct_typet with an identifier.
Definition std_types.h:493
Structure type, corresponds to C style structs.
Definition std_types.h:231
Base type for structs and unions.
Definition std_types.h:62
Expression to hold a symbol (variable)
Definition std_expr.h:131
const irep_idt & get_identifier() const
Definition std_expr.h:160
std::size_t next_unused_suffix(const std::string &prefix, std::size_t start_number) const
Find smallest unused integer i so that prefix + std::to_string(i) does not exist in the list symbols.
const symbolst & symbols
Read-only field, used to look up symbols given their names.
Symbol table entry.
Definition symbol.h:28
bool is_macro
Definition symbol.h:62
bool is_type
Definition symbol.h:61
typet type
Type of symbol.
Definition symbol.h:31
exprt value
Initial value of symbol.
Definition symbol.h:34
A tag-based type, i.e., typet with an identifier.
Definition std_types.h:396
const irep_idt & get_identifier() const
Definition std_types.h:410
The type of an expression, extends irept.
Definition type.h:29
A union tag type, i.e., union_typet with an identifier.
Definition c_types.h:199
The union type.
Definition c_types.h:147
#define Forall_operands(it, expr)
Definition expr.h:27
#define CHECK_RETURN(CONDITION)
Definition invariant.h:495
API to expression classes.
const symbol_exprt & to_symbol_expr(const exprt &expr)
Cast an exprt to a symbol_exprt.
Definition std_expr.h:272
const struct_typet & to_struct_type(const typet &type)
Cast a typet to a struct_typet.
Definition std_types.h:308
const struct_tag_typet & to_struct_tag_type(const typet &type)
Cast a typet to a struct_tag_typet.
Definition std_types.h:518
const struct_union_typet & to_struct_union_type(const typet &type)
Cast a typet to a struct_union_typet.
Definition std_types.h:214
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