Propagate string-printable option in object_factory

Note that for now this the default in the parameters is false and this
is not affected yet by the command line options.

Author: romainbrenguier

src/java_bytecode/java_bytecode_language.h

@@ -75,6 +75,9 @@ struct object_factory_parameterst final
   /// dereference a pointer using a 'depth counter'. We set a pointer to null if
   /// such depth becomes >= than this maximum value.
   size_t max_nondet_tree_depth=MAX_NONDET_TREE_DEPTH;
+
+  /// Force string content to be ASCII printable characters when set to true.
+  bool string_printable = false;
 };
 
 typedef std::pair<

src/java_bytecode/java_object_factory.cpp

@@ -624,6 +624,7 @@ codet initialize_nondet_string_struct(
 /// content and association of its address to the pointer `expr`.
 /// \param expr: pointer to be affected
 /// \param max_nondet_string_length: maximum length of strings to initialize
+/// \param printable: Boolean, true to force content to be printable
 /// \param symbol_table: the symbol table
 /// \param loc: location in the source
 /// \param [out] code: code block in which initialization code is added
@@ -633,6 +634,7 @@ codet initialize_nondet_string_struct(
 static bool add_nondet_string_pointer_initialization(
   const exprt &expr,
   const std::size_t &max_nondet_string_length,
+  bool printable,
   symbol_tablet &symbol_table,
   const source_locationt &loc,
   code_blockt &code)
@@ -652,7 +654,8 @@ static bool add_nondet_string_pointer_initialization(
       dereference_exprt(expr, struct_type),
       max_nondet_string_length,
       loc,
-      symbol_table));
+      symbol_table,
+      printable));
   return false;
 }
 
@@ -792,6 +795,7 @@ void java_object_factoryt::gen_nondet_pointer_init(
     add_nondet_string_pointer_initialization(
       expr,
       object_factory_parameters.max_nondet_string_length,
+      object_factory_parameters.string_printable,
       symbol_table,
       loc,
       assignments);

src/java_bytecode/java_object_factory.h

@@ -157,6 +157,6 @@ codet initialize_nondet_string_struct(
   const std::size_t &max_nondet_string_length,
   const source_locationt &loc,
   symbol_tablet &symbol_table,
-  bool printable = false);
+  bool printable);
 
 #endif // CPROVER_JAVA_BYTECODE_JAVA_OBJECT_FACTORY_H

unit/java_bytecode/java_object_factory/gen_nondet_string_init.cpp

@@ -49,7 +49,7 @@ SCENARIO(
     WHEN("Initialisation code for a string is generated")
     {
       const codet code =
-        initialize_nondet_string_struct(expr, 20, loc, symbol_table);
+        initialize_nondet_string_struct(expr, 20, loc, symbol_table, false);
 
       THEN("Code is produced")
       {