Merge pull request diffblue#1838 from mgudemann/bugfix/catch_unsupported_generics_exception

[TG-2453] catch unsupported generics exception

Author: Matthias Güdemann

src/java_bytecode/java_bytecode_convert_class.cpp

@@ -239,9 +239,19 @@ void java_bytecode_convert_classt::convert(const classt &c)
       extract_generic_superclass_reference(c.signature);
     if(superclass_ref.has_value())
     {
-      const java_generic_symbol_typet generic_base(
-        base, superclass_ref.value(), qualified_classname);
-      class_type.add_base(generic_base);
+      try
+      {
+        const java_generic_symbol_typet generic_base(
+          base, superclass_ref.value(), qualified_classname);
+        class_type.add_base(generic_base);
+      }
+      catch(unsupported_java_class_signature_exceptiont)
+      {
+        debug() << "unsupported generic superclass signature "
+                << id2string(*superclass_ref)
+                << " falling back on using the descriptor" << eom;
+        class_type.add_base(base);
+      }
     }
     else
     {
@@ -268,9 +278,19 @@ void java_bytecode_convert_classt::convert(const classt &c)
       extract_generic_interface_reference(c.signature, id2string(interface));
     if(interface_ref.has_value())
     {
-      const java_generic_symbol_typet generic_base(
-        base, interface_ref.value(), qualified_classname);
-      class_type.add_base(generic_base);
+      try
+      {
+        const java_generic_symbol_typet generic_base(
+          base, interface_ref.value(), qualified_classname);
+        class_type.add_base(generic_base);
+      }
+      catch(unsupported_java_class_signature_exceptiont)
+      {
+        debug() << "unsupported generic interface signature "
+                << id2string(*interface_ref)
+                << " falling back on using the descriptor" << eom;
+        class_type.add_base(base);
+      }
     }
     else
     {

unit/Makefile

@@ -45,6 +45,7 @@ SRC += unit_tests.cpp \
        util/symbol_table.cpp \
        catch_example.cpp \
        java_bytecode/java_virtual_functions/virtual_functions.cpp \
+       java_bytecode/java_bytecode_parse_generics/parse_generic_superclasses.cpp \
        # Empty last line
 
 INCLUDES= -I ../src/ -I.

unit/java_bytecode/java_bytecode_parse_generics/DerivedGenerics.java

@@ -169,3 +169,23 @@ public T someMethod() {
       return f;
   }
 }
+
+class GenericBounds extends Generic<Class<?>> {
+  // references exist only to load these class files, too
+  GenericBoundsUpper gen_upper;
+  GenericBoundsLower gen_lower;
+  GenericInterface gen_interface;
+
+}
+
+class GenericBoundsUpper extends Generic<Class<? extends Class>> {
+}
+
+class GenericBoundsLower extends Generic<Class<? super Class>> {
+}
+
+class GenericInterface implements InterfaceGeneric<Class<? extends Class>> {
+  public Class<? extends Class> someMethod(){
+    return null;
+  }
+}

unit/java_bytecode/java_bytecode_parse_generics/GenericBounds.class

@@ -0,0 +1,64 @@
+/*******************************************************************\
+
+ Module: Unit tests for parsing classes with generic superclasses or interfaces
+         with unsupported signatures, falling back to using the raw type
+         descriptors
+
+ Author: DiffBlue Limited. All rights reserved.
+
+\*******************************************************************/
+
+#include <testing-utils/catch.hpp>
+#include <testing-utils/load_java_class.h>
+#include <testing-utils/require_type.h>
+
+SCENARIO(
+  "parse generic superclass signature",
+  "[core][java_byte code[java_bytecode_parse_generics]]")
+{
+  const symbol_tablet &new_symbol_table = load_java_class(
+    "GenericBounds", "./java_bytecode/java_bytecode_parse_generics");
+
+  const std::string base_generic = "java::Generic";
+  const irep_idt base_generic_interface = "java::InterfaceGeneric";
+
+  const std::string load_class("java::GenericBounds");
+  THEN(
+    "these fields have a non-generic base class / interface  as their real "
+    "generic signature is unsupported at the moment")
+  {
+    // once bounds in generic signatures are supported, this test must be
+    // changed to check for the correct generic types, TODO(mgudemann),
+    // cf. TG-1286, TG-675
+    {
+      const symbolt &upper_symbol =
+        new_symbol_table.lookup_ref("java::GenericBoundsUpper");
+      const java_class_typet &upper_type =
+        to_java_class_type(upper_symbol.type);
+      REQUIRE(upper_type.bases().size() == 1);
+      const symbol_typet base_type = require_type::require_symbol(
+        upper_type.bases().at(0).type(), base_generic);
+      REQUIRE_FALSE(is_java_generic_symbol_type(base_type));
+    }
+    {
+      const symbolt &lower_symbol =
+        new_symbol_table.lookup_ref("java::GenericBoundsLower");
+      const java_class_typet &lower_type =
+        to_java_class_type(lower_symbol.type);
+      REQUIRE(lower_type.bases().size() == 1);
+      const symbol_typet base_type = require_type::require_symbol(
+        lower_type.bases().at(0).type(), base_generic);
+      REQUIRE_FALSE(is_java_generic_symbol_type(base_type));
+    }
+    {
+      const symbolt &interface_symbol =
+        new_symbol_table.lookup_ref("java::GenericInterface");
+      const java_class_typet &interface_type =
+        to_java_class_type(interface_symbol.type);
+      REQUIRE(interface_type.bases().size() == 2);
+      const symbol_typet base_type = require_type::require_symbol(
+        interface_type.bases().at(1).type(), base_generic_interface);
+      REQUIRE_FALSE(is_java_generic_symbol_type(base_type));
+    }
+  }
+}