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Test has_subtype on recursive data types #2084

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merged 1 commit into from
Apr 18, 2018
Merged

Test has_subtype on recursive data types #2084

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32 changes: 30 additions & 2 deletions unit/util/has_subtype.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -23,9 +23,9 @@ static std::function<bool(const typet &)> is_type(const typet &t1)
return f;
}

SCENARIO("has_subtype", "[core][solvers][refinement][string_refinement]")
SCENARIO("has_subtype", "[core][utils][has_subtype]")
{
const symbol_tablet symbol_table;
symbol_tablet symbol_table;
const namespacet ns(symbol_table);

const typet char_type = java_char_type();
Expand Down Expand Up @@ -63,4 +63,32 @@ SCENARIO("has_subtype", "[core][solvers][refinement][string_refinement]")
REQUIRE_FALSE(has_subtype(ptr_type, is_type(int_type), ns));
}
}

GIVEN("a recursive struct definition")
{
symbol_typet symbol_type("A-struct");
struct_typet::componentt comp("ptr", pointer_type(symbol_type));
struct_typet struct_type;
struct_type.components().push_back(comp);

symbolt s;
s.type = struct_type;
s.name = "A-struct";
s.is_type = true;
symbol_table.add(s);

THEN("has_subtype terminates")
{
REQUIRE_FALSE(
has_subtype(struct_type, [&](const typet &t) { return false; }, ns));
}
THEN("symbol type is a subtype")
{
REQUIRE(has_subtype(struct_type, is_type(pointer_type(symbol_type)), ns));
}
THEN("struct type is a subtype")
{
REQUIRE(has_subtype(struct_type, is_type(struct_type), ns));
}
}
}