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shared_buffers.h
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1/*******************************************************************\
2
3Module:
4
5Author: Daniel Kroening, kroening@kroening.com
6
7\*******************************************************************/
8
9
10#ifndef CPROVER_GOTO_INSTRUMENT_WMM_SHARED_BUFFERS_H
11#define CPROVER_GOTO_INSTRUMENT_WMM_SHARED_BUFFERS_H
12
13#include <map>
14#include <set>
15
17#include <util/cprover_prefix.h>
18#include <util/namespace.h>
19#include <util/prefix.h>
20#include <util/symbol_table.h>
21
22#include "wmm.h"
23
24class goto_functionst;
25class messaget;
26class value_setst;
27
29{
30public:
31 shared_bufferst(symbol_tablet &_symbol_table, unsigned _nb_threads,
32 messaget &_message):
33 symbol_table(_symbol_table),
34 nb_threads(_nb_threads+1),
35 uniq(0),
36 cav11(false),
37 message(_message)
38 {
39 }
40
42 {
43 if(model!=TSO)
44 throw "sorry, CAV11 only available for TSO";
45 cav11 = true;
46 }
47
48 /* instrumentation of a variable */
49 class varst
50 {
51 public:
52 // Older stuff has the higher index.
53 // Shared buffer.
55
56 // Are those places empty?
58
59 // Delays write buffer flush: just to make some swaps between mem and buff
60 // -- this is to model lhs := rhs with rhs reading in the buffer without
61 // affecting the memory (Note: we model lhs := rhs by rhs := ..., then
62 // lhs := rhs)
65
66 // Thread: Was it me who wrote at this place?
67 std::vector<irep_idt> r_buff0_thds, r_buff1_thds;
68
69 // for delayed read:
72
74 };
75
76 typedef std::map<irep_idt, varst> var_mapt;
78
79 /* instructions in violation cycles (to instrument): */
80 // variables in the cycles
81 std::set<irep_idt> cycles;
82 // events instrumented: var->locations in the code
83 std::multimap<irep_idt, source_locationt> cycles_loc;
84 // events in cycles: var->locations (for read instrumentations)
85 std::multimap<irep_idt, source_locationt> cycles_r_loc;
86
87 const varst &operator()(const irep_idt &object);
88
89 void add_initialization_code(goto_functionst &goto_functions);
90
91 void delay_read(
92 goto_programt &goto_program,
94 const source_locationt &source_location,
95 const irep_idt &read_object,
96 const irep_idt &write_object);
97
98 void flush_read(
99 goto_programt &goto_program,
101 const source_locationt &source_location,
102 const irep_idt &write_object);
103
104 void write(
105 goto_programt &goto_program,
107 const source_locationt &source_location,
108 const irep_idt &object,
109 goto_programt::instructiont &original_instruction,
110 const unsigned current_thread);
111
112 void det_flush(
113 goto_programt &goto_program,
115 const source_locationt &source_location,
116 const irep_idt &object,
117 const unsigned current_thread);
118
119 void nondet_flush(
120 const irep_idt &function_id,
121 goto_programt &goto_program,
123 const source_locationt &source_location,
124 const irep_idt &object,
125 const unsigned current_thread,
126 const bool tso_pso_rmo);
127
128 void assignment(
129 goto_programt &goto_program,
131 const source_locationt &source_location,
132 const irep_idt &id_lhs,
133 const exprt &rhs);
134
136 goto_programt &goto_program,
138 const source_locationt &source_location,
139 const irep_idt &id_lhs,
140 const irep_idt &id_rhs)
141 {
143 assignment(goto_program, t, source_location, id_lhs,
144 ns.lookup(id_rhs).symbol_expr());
145 }
146
147 bool track(const irep_idt &id) const
148 {
150
151 const symbolt &symbol=ns.lookup(id);
152 if(symbol.is_thread_local)
153 return false;
155 return false;
156
157 return true;
158 }
159
160 irep_idt choice(const irep_idt &function_id, const std::string &suffix)
161 {
162 const auto maybe_symbol = symbol_table.lookup(function_id);
163 CHECK_RETURN(maybe_symbol);
164 return add(*maybe_symbol, "_weak_choice" + suffix, bool_typet());
165 }
166
167 bool is_buffered(
168 const namespacet&,
169 const symbol_exprt&,
170 bool is_write);
171
173 const symbol_exprt&,
174 bool is_write);
175
177 value_setst &value_sets,
179 goto_programt &goto_program,
180 memory_modelt model,
181 goto_functionst &goto_functions);
182
184 value_setst &value_sets,
185 goto_functionst &goto_functions);
186
188 {
189 protected:
193
194 /* for thread marking (dynamic) */
196 unsigned coming_from;
197 unsigned max_thread;
198
199 /* data propagated through the CFG */
200 std::set<irep_idt> past_writes;
201
202 public:
204 goto_functionst &_goto_functions)
205 :shared_buffers(_shared), symbol_table(_symbol_table),
206 goto_functions(_goto_functions)
207 {
208 current_thread = 0;
209 coming_from = 0;
210 max_thread = 0;
211 }
212
213 void weak_memory(
214 value_setst &value_sets,
215 const irep_idt &function_id,
216 memory_modelt model);
217 };
218
219protected:
221
222 // number of threads interfering
223 unsigned nb_threads;
224
225 // instrumentations (not to be instrumented again)
226 std::set<irep_idt> instrumentations;
227
228 // variables (non necessarily shared) affected by reads delay
229public:
230 std::set<irep_idt> affected_by_delay_set;
231
232protected:
233 // for fresh variables
234 unsigned uniq;
235
236 std::string unique();
237
238 bool cav11;
239
240 /* message */
242
244 const symbolt &object,
245 const std::string &suffix,
246 const typet &type,
247 bool added_as_instrumentation);
248
250 add(const symbolt &object, const std::string &suffix, const typet &type)
251 {
252 return add(object, suffix, type, true);
253 }
254
255 /* inserting a non-instrumenting, fresh variable */
257 const symbolt &object,
258 const std::string &suffix,
259 const typet &type)
260 {
261 return add(object, suffix, type, false);
262 }
263
264 void add_initialization(goto_programt &goto_program);
265};
266
267#endif // CPROVER_GOTO_INSTRUMENT_WMM_SHARED_BUFFERS_H
The Boolean type.
Definition std_types.h:36
dstringt has one field, an unsigned integer no which is an index into a static table of strings.
Definition dstring.h:37
Base class for all expressions.
Definition expr.h:54
A collection of goto functions.
This class represents an instruction in the GOTO intermediate representation.
A generic container class for the GOTO intermediate representation of one function.
instructionst::iterator targett
Class that provides messages with a built-in verbosity 'level'.
Definition message.h:155
A namespacet is essentially one or two symbol tables bound together, to allow for symbol lookups in t...
Definition namespace.h:91
bool lookup(const irep_idt &name, const symbolt *&symbol) const override
See documentation for namespace_baset::lookup().
cfg_visitort(shared_bufferst &_shared, symbol_tablet &_symbol_table, goto_functionst &_goto_functions)
void weak_memory(value_setst &value_sets, const irep_idt &function_id, memory_modelt model)
instruments the program for the pairs detected through the CFG
std::set< irep_idt > past_writes
std::vector< irep_idt > r_buff0_thds
std::vector< irep_idt > r_buff1_thds
std::multimap< irep_idt, source_locationt > cycles_loc
const varst & operator()(const irep_idt &object)
instruments the variable
void set_cav11(memory_modelt model)
void nondet_flush(const irep_idt &function_id, goto_programt &goto_program, goto_programt::targett &t, const source_locationt &source_location, const irep_idt &object, const unsigned current_thread, const bool tso_pso_rmo)
instruments read
std::string unique()
returns a unique id (for fresh variables)
void write(goto_programt &goto_program, goto_programt::targett &t, const source_locationt &source_location, const irep_idt &object, goto_programt::instructiont &original_instruction, const unsigned current_thread)
instruments write
void weak_memory(value_setst &value_sets, symbol_tablet &symbol_table, goto_programt &goto_program, memory_modelt model, goto_functionst &goto_functions)
void affected_by_delay(value_setst &value_sets, goto_functionst &goto_functions)
analysis over the goto-program which computes in affected_by_delay_set the variables (non necessarily...
void det_flush(goto_programt &goto_program, goto_programt::targett &t, const source_locationt &source_location, const irep_idt &object, const unsigned current_thread)
flush buffers (instruments fence)
irep_idt add_fresh_var(const symbolt &object, const std::string &suffix, const typet &type)
void add_initialization(goto_programt &goto_program)
bool is_buffered_in_general(const symbol_exprt &, bool is_write)
void assignment(goto_programt &goto_program, goto_programt::targett &t, const source_locationt &source_location, const irep_idt &id_lhs, const exprt &rhs)
add an assignment in the goto-program
irep_idt add(const symbolt &object, const std::string &suffix, const typet &type, bool added_as_instrumentation)
add a new var for instrumenting the input var
std::set< irep_idt > affected_by_delay_set
std::set< irep_idt > cycles
void delay_read(goto_programt &goto_program, goto_programt::targett &t, const source_locationt &source_location, const irep_idt &read_object, const irep_idt &write_object)
delays a read (POWER)
void flush_read(goto_programt &goto_program, goto_programt::targett &t, const source_locationt &source_location, const irep_idt &write_object)
flushes read (POWER)
std::multimap< irep_idt, source_locationt > cycles_r_loc
std::map< irep_idt, varst > var_mapt
irep_idt choice(const irep_idt &function_id, const std::string &suffix)
void add_initialization_code(goto_functionst &goto_functions)
bool track(const irep_idt &id) const
shared_bufferst(symbol_tablet &_symbol_table, unsigned _nb_threads, messaget &_message)
irep_idt add(const symbolt &object, const std::string &suffix, const typet &type)
bool is_buffered(const namespacet &, const symbol_exprt &, bool is_write)
std::set< irep_idt > instrumentations
class symbol_tablet & symbol_table
void assignment(goto_programt &goto_program, goto_programt::targett &t, const source_locationt &source_location, const irep_idt &id_lhs, const irep_idt &id_rhs)
Expression to hold a symbol (variable)
Definition std_expr.h:80
const symbolt * lookup(const irep_idt &name) const
Find a symbol in the symbol table for read-only access.
The symbol table.
Symbol table entry.
Definition symbol.h:28
bool is_thread_local
Definition symbol.h:65
The type of an expression, extends irept.
Definition type.h:29
bool has_prefix(const std::string &s, const std::string &prefix)
Definition converter.cpp:13
#define CPROVER_PREFIX
Concrete Goto Program.
const std::string & id2string(const irep_idt &d)
Definition irep.h:47
#define CHECK_RETURN(CONDITION)
Definition invariant.h:495
Author: Diffblue Ltd.
memory models
memory_modelt
Definition wmm.h:18
@ TSO
Definition wmm.h:20