Add new jbmc option --static-values

The option expects the path to a JSON file as an argument, and the file
is expected to contain a map of maps: the first map uses class names as
keys, the inner maps use field names, and the values of the inner maps
are initial values of static fields.
This path is then stored in a new field of java_bytecode_languaget. From
here, we will be able to look for the file if it was specified, parse
it, and construct assignments that are equivalent to and replace the
clinit function.

Author: antlechner

jbmc/src/java_bytecode/java_bytecode_language.cpp

@@ -87,6 +87,10 @@ void parse_java_language_options(const cmdlinet &cmd, optionst &options)
     options.set_option(
       "java-cp-include-files", cmd.get_value("java-cp-include-files"));
   }
+  if(cmd.isset("static-values"))
+  {
+    options.set_option("static-values", cmd.get_value("static-values"));
+  }
 }
 
 /// Consume options that are java bytecode specific.
@@ -177,6 +181,7 @@ void java_bytecode_languaget::set_language_options(const optionst &options)
     java_cp_include_files=".*";
 
   nondet_static = options.get_bool_option("nondet-static");
+  static_values_file = options.get_option("static-values");
 
   language_options_initialized=true;
 }

jbmc/src/java_bytecode/java_bytecode_language.h

@@ -39,7 +39,8 @@ Author: Daniel Kroening, [email protected]
   "(no-lazy-methods)" \
   "(lazy-methods-extra-entry-point):" \
   "(java-load-class):" \
-  "(java-no-load-class):"
+  "(java-no-load-class):" \
+  "(static-values):"
 
 #define JAVA_BYTECODE_LANGUAGE_OPTIONS_HELP /*NOLINT*/ \
   " --disable-uncaught-exception-check\n" \
@@ -71,7 +72,13 @@ Author: Daniel Kroening, [email protected]
   "                              METHODNAME can be a regex that will be matched\n" /* NOLINT(*) */ \
   "                              against all symbols. If missing a java:: prefix\n"    /* NOLINT(*) */ \
   "                              will be added. If no descriptor is found, all\n"/* NOLINT(*) */ \
-  "                              overloads of a method will also be added.\n"
+  "                              overloads of a method will also be added.\n" \
+  " --static-values f            Load initial values of static fields from the given\n"/* NOLINT(*) */ \
+  "                              JSON file. We assign static fields to these values\n"/* NOLINT(*) */ \
+  "                              instead of calling the normal static initializer\n"/* NOLINT(*) */ \
+  "                              (clinit) method.\n" \
+  "                              The argument can be a relative or absolute path to\n"/* NOLINT(*) */ \
+  "                              the file.\n"
 // clang-format on
 
 class symbolt;
@@ -197,6 +204,10 @@ class java_bytecode_languaget:public languaget
   java_string_library_preprocesst string_preprocess;
   std::string java_cp_include_files;
   bool nondet_static;
+  /// Path to a JSON file which contains initial values of static fields (right
+  /// after the static initializer of the class was run). This is read from the
+  /// --static-values command-line option.
+  std::string static_values_file;
 
   // list of classes to force load even without reference from the entry point
   std::vector<irep_idt> java_load_classes;