cprover
convert_java_nondet.cpp
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1/*******************************************************************\
2
3Module: Convert side_effect_expr_nondett expressions
4
5Author: Reuben Thomas, reuben.thomas@diffblue.com
6
7\*******************************************************************/
8
11
12#include "convert_java_nondet.h"
13
17
18#include "java_object_factory.h" // gen_nondet_init
20#include "java_utils.h"
21
24static bool is_nondet_pointer(exprt expr)
25{
26 // If the expression type doesn't have a subtype then I guess it's primitive
27 // and we do not want to convert it. If the type is a ptr-to-void or a
28 // function pointer then we also do not want to convert it.
29 const typet &type = expr.type();
30 const bool non_void_non_function_pointer = type.id() == ID_pointer &&
31 type.subtype().id() != ID_empty &&
32 type.subtype().id() != ID_code;
34 non_void_non_function_pointer;
35}
36
40 const symbol_exprt &aux_symbol_expr,
41 const source_locationt &source_loc,
42 symbol_table_baset &symbol_table,
43 message_handlert &message_handler,
44 const java_object_factory_parameterst &object_factory_parameters,
45 const irep_idt &mode)
46{
47 code_blockt gen_nondet_init_code;
48 const bool skip_classid = true;
50 aux_symbol_expr,
51 gen_nondet_init_code,
52 symbol_table,
53 source_loc,
54 skip_classid,
56 object_factory_parameters,
58 message_handler);
59
60 goto_programt instructions;
62 gen_nondet_init_code, symbol_table, instructions, message_handler, mode);
63 return instructions;
64}
65
79static std::pair<goto_programt::targett, bool> insert_nondet_init_code(
80 const irep_idt &function_identifier,
81 goto_programt &goto_program,
82 const goto_programt::targett &target,
83 symbol_table_baset &symbol_table,
84 message_handlert &message_handler,
85 java_object_factory_parameterst object_factory_parameters,
86 const irep_idt &mode)
87{
88 const auto next_instr = std::next(target);
89
90 // We only expect to find nondets in the rhs of an assignments, and in return
91 // statements if remove_returns has not been run, but we do a more general
92 // check on all operands in case this changes
93 for(exprt &op : target->code_nonconst().operands())
94 {
95 if(!is_nondet_pointer(op))
96 {
97 continue;
98 }
99
100 const auto &nondet_expr = to_side_effect_expr_nondet(op);
101
102 if(!nondet_expr.get_nullable())
103 object_factory_parameters.min_null_tree_depth = 1;
104
105 const source_locationt &source_loc = target->source_location();
106
107 // Currently the code looks like this
108 // target: instruction containing op
109 // When we are done it will look like this
110 // target : declare aux_symbol
111 // . <gen_nondet_init_instructions - many lines>
112 // . <gen_nondet_init_instructions - many lines>
113 // . <gen_nondet_init_instructions - many lines>
114 // target2: instruction containing op, with op replaced by aux_symbol
115 // dead aux_symbol
116
117 symbolt &aux_symbol = fresh_java_symbol(
118 op.type(), "nondet_tmp", source_loc, function_identifier, symbol_table);
119
120 const symbol_exprt aux_symbol_expr = aux_symbol.symbol_expr();
121 op = aux_symbol_expr;
122
123 // Insert an instruction declaring `aux_symbol` before `target`, being
124 // careful to preserve jumps to `target`
125 goto_programt::instructiont decl_aux_symbol =
126 goto_programt::make_decl(code_declt(aux_symbol_expr), source_loc);
127 goto_program.insert_before_swap(target, decl_aux_symbol);
128
129 // Keep track of the new location of the instruction containing op.
130 const goto_programt::targett target2 = std::next(target);
131
132 goto_programt gen_nondet_init_instructions =
134 aux_symbol_expr,
135 source_loc,
136 symbol_table,
137 message_handler,
138 object_factory_parameters,
139 mode);
140 goto_program.destructive_insert(target2, gen_nondet_init_instructions);
141
142 goto_program.insert_after(
143 target2, goto_programt::make_dead(aux_symbol_expr, source_loc));
144
145 // In theory target could have more than one operand which should be
146 // replaced by convert_nondet, so we return target2 so that it
147 // will be checked again
148 return std::make_pair(target2, true);
149 }
150
151 return std::make_pair(next_instr, false);
152}
153
165 const irep_idt &function_identifier,
166 goto_programt &goto_program,
167 symbol_table_baset &symbol_table,
168 message_handlert &message_handler,
169 const java_object_factory_parameterst &user_object_factory_parameters,
170 const irep_idt &mode)
171{
172 java_object_factory_parameterst object_factory_parameters =
173 user_object_factory_parameters;
174 object_factory_parameters.function_id = function_identifier;
175
176 bool changed = false;
177 auto instruction_iterator = goto_program.instructions.begin();
178
179 while(instruction_iterator != goto_program.instructions.end())
180 {
181 auto ret = insert_nondet_init_code(
182 function_identifier,
183 goto_program,
184 instruction_iterator,
185 symbol_table,
186 message_handler,
187 object_factory_parameters,
188 mode);
189 instruction_iterator = ret.first;
190 changed |= ret.second;
191 }
192
193 if(changed)
194 {
195 goto_program.update();
196 }
197}
198
200 goto_model_functiont &function,
201 message_handlert &message_handler,
202 const java_object_factory_parameterst &object_factory_parameters,
203 const irep_idt &mode)
204{
206 function.get_function_id(),
207 function.get_goto_function().body,
208 function.get_symbol_table(),
209 message_handler,
210 object_factory_parameters,
211 mode);
212
213 function.compute_location_numbers();
214}
215
217 goto_functionst &goto_functions,
218 symbol_table_baset &symbol_table,
219 message_handlert &message_handler,
220 const java_object_factory_parameterst &object_factory_parameters)
221{
222 const namespacet ns(symbol_table);
223
224 for(auto &f_it : goto_functions.function_map)
225 {
226 const symbolt &symbol=ns.lookup(f_it.first);
227
228 if(symbol.mode==ID_java)
229 {
231 f_it.first,
232 f_it.second.body,
233 symbol_table,
234 message_handler,
235 object_factory_parameters,
236 symbol.mode);
237 }
238 }
239
240 goto_functions.compute_location_numbers();
241
242 remove_skip(goto_functions);
243}
244
246 goto_modelt &goto_model,
247 message_handlert &message_handler,
248 const java_object_factory_parameterst &object_factory_parameters)
249{
251 goto_model.goto_functions,
252 goto_model.symbol_table,
253 message_handler,
254 object_factory_parameters);
255}
@ DYNAMIC
Allocate dynamic objects (using ALLOCATE)
A codet representing sequential composition of program statements.
Definition: std_code.h:130
A codet representing the declaration of a local variable.
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
typet & type()
Return the type of the expression.
Definition: expr.h:82
operandst & operands()
Definition: expr.h:92
A collection of goto functions.
function_mapt function_map
void compute_location_numbers()
Interface providing access to a single function in a GOTO model, plus its associated symbol table.
Definition: goto_model.h:183
const irep_idt & get_function_id()
Get function id.
Definition: goto_model.h:232
goto_functionst::goto_functiont & get_goto_function()
Get GOTO function.
Definition: goto_model.h:225
void compute_location_numbers()
Re-number our goto_function.
Definition: goto_model.h:209
journalling_symbol_tablet & get_symbol_table()
Get symbol table.
Definition: goto_model.h:218
symbol_tablet symbol_table
Symbol table.
Definition: goto_model.h:30
goto_functionst goto_functions
GOTO functions.
Definition: goto_model.h:33
This class represents an instruction in the GOTO intermediate representation.
Definition: goto_program.h:180
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
static instructiont make_dead(const symbol_exprt &symbol, const source_locationt &l=source_locationt::nil())
Definition: goto_program.h:956
void update()
Update all indices.
void insert_before_swap(targett target)
Insertion that preserves jumps to "target".
Definition: goto_program.h:619
void destructive_insert(const_targett target, goto_programt &p)
Inserts the given program p before target.
Definition: goto_program.h:706
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_decl(const symbol_exprt &symbol, const source_locationt &l=source_locationt::nil())
Definition: goto_program.h:949
const irep_idt & id() const
Definition: irep.h:396
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().
Definition: namespace.cpp:138
Expression to hold a symbol (variable)
Definition: std_expr.h:80
The symbol table base class interface.
Symbol table entry.
Definition: symbol.h:28
class symbol_exprt symbol_expr() const
Produces a symbol_exprt for a symbol.
Definition: symbol.cpp:121
irep_idt mode
Language mode.
Definition: symbol.h:49
The type of an expression, extends irept.
Definition: type.h:29
const typet & subtype() const
Definition: type.h:48
static bool is_nondet_pointer(exprt expr)
Returns true if expr is a nondet pointer that isn't a function pointer or a void* pointer as these ca...
static std::pair< goto_programt::targett, bool > insert_nondet_init_code(const irep_idt &function_identifier, goto_programt &goto_program, const goto_programt::targett &target, symbol_table_baset &symbol_table, message_handlert &message_handler, java_object_factory_parameterst object_factory_parameters, const irep_idt &mode)
Checks an instruction to see whether it contains an assignment from side_effect_expr_nondet.
static goto_programt get_gen_nondet_init_instructions(const symbol_exprt &aux_symbol_expr, const source_locationt &source_loc, symbol_table_baset &symbol_table, message_handlert &message_handler, const java_object_factory_parameterst &object_factory_parameters, const irep_idt &mode)
Populate instructions with goto instructions to nondet init aux_symbol_expr
void convert_nondet(const irep_idt &function_identifier, goto_programt &goto_program, symbol_table_baset &symbol_table, message_handlert &message_handler, const java_object_factory_parameterst &user_object_factory_parameters, const irep_idt &mode)
For each instruction in the goto program, checks if it is an assignment from nondet and replaces it w...
Convert side_effect_expr_nondett expressions using java_object_factory.
void goto_convert(const codet &code, symbol_table_baset &symbol_table, goto_programt &dest, message_handlert &message_handler, const irep_idt &mode)
Program Transformation.
Symbol Table + CFG.
void gen_nondet_init(const exprt &expr, code_blockt &init_code, symbol_table_baset &symbol_table, const source_locationt &loc, bool skip_classid, lifetimet lifetime, const java_object_factory_parameterst &object_factory_parameters, const select_pointer_typet &pointer_type_selector, update_in_placet update_in_place, message_handlert &log)
Initializes a primitive-typed or reference-typed object tree rooted at expr, allocating child objects...
This module is responsible for the synthesis of code (in the form of a sequence of codet statements) ...
symbolt & fresh_java_symbol(const typet &type, const std::string &basename_prefix, const source_locationt &source_location, const irep_idt &function_name, symbol_table_baset &symbol_table)
Definition: java_utils.cpp:558
void remove_skip(goto_programt &goto_program, goto_programt::targett begin, goto_programt::targett end)
remove unnecessary skip statements
Definition: remove_skip.cpp:88
Program Transformation.
bool can_cast_expr< side_effect_expr_nondett >(const exprt &base)
Definition: std_code.h:1540
side_effect_expr_nondett & to_side_effect_expr_nondet(exprt &expr)
Definition: std_code.h:1548
irep_idt function_id
Function id, used as a prefix for identifiers of temporaries.
size_t min_null_tree_depth
To force a certain depth of non-null objects.