void cpp_typecheckt::convert_non_template_declaration(
cpp_declarationt &declaration)
{
assert(!declaration.is_template());
// we first check if this is a typedef
typet &declaration_type=declaration.type();
bool is_typedef=declaration.is_typedef();
declaration.name_anon_struct_union();
typecheck_type(declaration_type);
// Elaborate any class template instance _unless_ we do a typedef.
// These are only elaborated on usage!
if(!is_typedef)
elaborate_class_template(declaration_type);
// Special treatment for anonymous unions
if(declaration.declarators().empty() &&
follow(declaration.type()).get_bool(ID_C_is_anonymous))
{
typet final_type=follow(declaration.type());
if(final_type.id()!=ID_union)
{
error().source_location=final_type.source_location();
error() << "top-level declaration does not declare anything"
<< eom;
throw 0;
}
codet dummy;
convert_anonymous_union(declaration, dummy);
}
// do the declarators (optional)
Forall_cpp_declarators(it, declaration)
{
// copy the declarator (we destroy the original)
cpp_declaratort declarator=*it;
cpp_declarator_convertert cpp_declarator_converter(*this);
cpp_declarator_converter.is_typedef=is_typedef;
symbolt &symbol=cpp_declarator_converter.convert(
declaration_type, declaration.storage_spec(),
declaration.member_spec(), declarator);
// any template instance to remember?
if(declaration.find(ID_C_template).is_not_nil())
{
symbol.type.set(ID_C_template, declaration.find(ID_C_template));
symbol.type.set(ID_C_template_arguments, declaration.find(ID_C_template_arguments));
}
// replace declarator by symbol expression
exprt tmp=cpp_symbol_expr(symbol);
it->swap(tmp);
// is there a constructor to be called for the declarator?
if(symbol.is_lvalue &&
declarator.init_args().has_operands())
{
symbol.value=
cpp_constructor(
symbol.location,
cpp_symbol_expr(symbol),
declarator.init_args().operands());
}
}
void cpp_typecheckt::convert_anonymous_union(
cpp_declarationt &declaration,
codet &code)
{
codet new_code(ID_decl_block);
new_code.reserve_operands(declaration.declarators().size());
// unnamed object
std::string identifier="#anon_union"+i2string(anon_counter++);
irept name(ID_name);
name.set(ID_identifier, identifier);
name.set(ID_C_source_location, declaration.source_location());
cpp_namet cpp_name;
cpp_name.move_to_sub(name);
cpp_declaratort declarator;
declarator.name()=cpp_name;
cpp_declarator_convertert cpp_declarator_converter(*this);
const symbolt &symbol=
cpp_declarator_converter.convert(declaration, declarator);
if(!cpp_is_pod(declaration.type()))
{
error().source_location=follow(declaration.type()).source_location();
error() << "anonymous union is not POD" << eom;
throw 0;
}
codet decl_statement(ID_decl);
decl_statement.reserve_operands(2);
decl_statement.copy_to_operands(cpp_symbol_expr(symbol));
new_code.move_to_operands(decl_statement);
// do scoping
symbolt union_symbol=symbol_table.symbols[follow(symbol.type).get(ID_name)];
const irept::subt &components=union_symbol.type.add(ID_components).get_sub();
forall_irep(it, components)
{
if(it->find(ID_type).id()==ID_code)
{
error().source_location=union_symbol.type.source_location();
error() << "anonymous union `" << union_symbol.base_name
<< "' shall not have function members" << eom;
throw 0;
}
const irep_idt &base_name=it->get(ID_base_name);
if(cpp_scopes.current_scope().contains(base_name))
{
error().source_location=union_symbol.type.source_location();
error() << "identifier `" << base_name << "' already in scope"
<< eom;
throw 0;
}
cpp_idt &id=cpp_scopes.current_scope().insert(base_name);
id.id_class = cpp_idt::SYMBOL;
id.identifier=it->get(ID_name);
id.class_identifier=union_symbol.name;
id.is_member=true;
}
symbol_table.symbols[union_symbol.name].type.set(
"#unnamed_object", symbol.base_name);
code.swap(new_code);
}
void cpp_typecheckt::convert_template_function_or_member_specialization(
cpp_declarationt &declaration)
{
cpp_save_scopet saved_scope(cpp_scopes);
if(declaration.declarators().size()!=1 ||
declaration.declarators().front().type().id()!=ID_function_type)
{
err_location(declaration.type());
str << "expected function template specialization";
throw 0;
}
assert(declaration.declarators().size()==1);
cpp_declaratort declarator=declaration.declarators().front();
cpp_namet &cpp_name=declarator.name();
if(cpp_name.is_qualified())
{
err_location(cpp_name.source_location());
str << "qualifiers not expected here";
throw 0;
}
// There is specialization (instantiation with template arguments)
// but also function overloading (no template arguments)
assert(!cpp_name.get_sub().empty());
if(cpp_name.get_sub().back().id()==ID_template_args)
{
// proper specialization with arguments
if(cpp_name.get_sub().size()!=2 ||
cpp_name.get_sub()[0].id()!=ID_name ||
cpp_name.get_sub()[1].id()!=ID_template_args)
{
// currently we are more restrictive
// than the standard
err_location(cpp_name.source_location());
str << "bad template-function-specialization name";
throw 0;
}
std::string base_name=
cpp_name.get_sub()[0].get(ID_identifier).c_str();
cpp_scopest::id_sett id_set;
cpp_scopes.current_scope().lookup(
base_name, cpp_scopet::SCOPE_ONLY, id_set);
if(id_set.empty())
{
err_location(cpp_name.source_location());
str << "template function `" << base_name << "' not found";
throw 0;
}
else if(id_set.size()>1)
{
err_location(cpp_name.source_location());
str << "template function `" << base_name << "' is ambiguous";
}
const symbolt &template_symbol=
lookup((*id_set.begin())->identifier);
cpp_template_args_tct template_args=
typecheck_template_args(
declaration.source_location(),
template_symbol,
to_cpp_template_args_non_tc(cpp_name.get_sub()[1]));
cpp_name.get_sub().pop_back();
typet specialization;
specialization.swap(declarator);
instantiate_template(
cpp_name.source_location(),
template_symbol,
template_args,
template_args,
specialization);
}
else
{
// Just overloading, but this is still a template
// for disambiguation purposes!
// http://www.gotw.ca/publications/mill17.htm
cpp_declarationt new_declaration=declaration;
new_declaration.remove(ID_template_type);
new_declaration.remove(ID_is_template);
new_declaration.set(ID_C_template, ""); // todo, get identifier
convert_non_template_declaration(new_declaration);
}
}
void cpp_typecheckt::typecheck_class_template_member(
cpp_declarationt &declaration)
{
assert(declaration.declarators().size()==1);
cpp_declaratort &declarator=declaration.declarators()[0];
const cpp_namet &cpp_name=to_cpp_name(declarator.add(ID_name));
assert(cpp_name.is_qualified() ||
cpp_name.has_template_args());
// must be of the form: name1<template_args>::name2
// or: name1<template_args>::operator X
if(cpp_name.get_sub().size()==4 &&
cpp_name.get_sub()[0].id()==ID_name &&
cpp_name.get_sub()[1].id()==ID_template_args &&
cpp_name.get_sub()[2].id()=="::" &&
cpp_name.get_sub()[3].id()==ID_name)
{
}
else if(cpp_name.get_sub().size()==5 &&
cpp_name.get_sub()[0].id()==ID_name &&
cpp_name.get_sub()[1].id()==ID_template_args &&
cpp_name.get_sub()[2].id()=="::" &&
cpp_name.get_sub()[3].id()==ID_operator)
{
}
else
{
return; // TODO
err_location(cpp_name);
str << "bad template name";
throw 0;
}
// let's find the class template this function template belongs to.
cpp_scopet::id_sett id_set;
cpp_scopes.current_scope().lookup(
cpp_name.get_sub().front().get(ID_identifier),
cpp_scopet::SCOPE_ONLY, // look only in current scope
cpp_scopet::TEMPLATE, // must be template
id_set);
if(id_set.empty())
{
str << cpp_scopes.current_scope();
err_location(cpp_name);
str << "class template `"
<< cpp_name.get_sub().front().get(ID_identifier)
<< "' not found";
throw 0;
}
else if(id_set.size()>1)
{
err_location(cpp_name);
str << "class template `"
<< cpp_name.get_sub().front().get(ID_identifier)
<< "' is ambiguous";
throw 0;
}
else if((*(id_set.begin()))->id_class!=cpp_idt::TEMPLATE)
{
// std::cerr << *(*id_set.begin()) << std::endl;
err_location(cpp_name);
str << "class template `"
<< cpp_name.get_sub().front().get(ID_identifier)
<< "' is not a template";
throw 0;
}
const cpp_idt &cpp_id=**(id_set.begin());
symbolt &template_symbol=
symbol_table.symbols.find(cpp_id.identifier)->second;
exprt &template_methods=static_cast<exprt &>(
template_symbol.value.add("template_methods"));
template_methods.copy_to_operands(declaration);
// save current scope
cpp_save_scopet cpp_saved_scope(cpp_scopes);
const irept &instantiated_with =
template_symbol.value.add("instantiated_with");
for(unsigned i=0; i<instantiated_with.get_sub().size(); i++)
{
const cpp_template_args_tct &tc_template_args=
static_cast<const cpp_template_args_tct &>(instantiated_with.get_sub()[i]);
cpp_declarationt decl_tmp=declaration;
// do template arguments
// this also sets up the template scope of the method
cpp_scopet &method_scope=
typecheck_template_parameters(decl_tmp.template_type());
cpp_scopes.go_to(method_scope);
// mapping from template arguments to values/types
template_map.build(decl_tmp.template_type(), tc_template_args);
decl_tmp.remove(ID_template_type);
decl_tmp.remove(ID_is_template);
convert(decl_tmp);
cpp_saved_scope.restore();
}
}
void cpp_typecheckt::typecheck_function_template(
cpp_declarationt &declaration)
{
assert(declaration.declarators().size()==1);
cpp_declaratort &declarator=declaration.declarators()[0];
const cpp_namet &cpp_name=to_cpp_name(declarator.add(ID_name));
// do template arguments
// this also sets up the template scope
cpp_scopet &template_scope=
typecheck_template_parameters(declaration.template_type());
if(!cpp_name.is_simple_name())
{
err_location(declaration);
str << "function template must have simple name";
throw 0;
}
irep_idt base_name=cpp_name.get_base_name();
template_typet &template_type=declaration.template_type();
typet function_type=
declarator.merge_type(declaration.type());
cpp_convert_plain_type(function_type);
irep_idt symbol_name=
function_template_identifier(
base_name,
template_type,
function_type);
bool has_value=declarator.find(ID_value).is_not_nil();
// check if we have it already
symbol_tablet::symbolst::iterator previous_symbol=
symbol_table.symbols.find(symbol_name);
if(previous_symbol!=symbol_table.symbols.end())
{
bool previous_has_value =
to_cpp_declaration(previous_symbol->second.type).
declarators()[0].find(ID_value).is_not_nil();
if(has_value && previous_has_value)
{
err_location(cpp_name.source_location());
str << "function template symbol `" << base_name
<< "' declared previously" << std::endl;
str << "location of previous definition: "
<< previous_symbol->second.location;
throw 0;
}
if(has_value)
{
previous_symbol->second.type.swap(declaration);
cpp_scopes.id_map[symbol_name]=&template_scope;
}
// todo: the old template scope now is useless,
// and thus, we could delete it
return;
}
symbolt symbol;
symbol.name=symbol_name;
symbol.base_name=base_name;
symbol.location=cpp_name.source_location();
symbol.mode=ID_cpp;
symbol.module=module;
symbol.value.make_nil();
symbol.type.swap(declaration);
symbol.pretty_name=
cpp_scopes.current_scope().prefix+id2string(symbol.base_name);
symbolt *new_symbol;
if(symbol_table.move(symbol, new_symbol))
throw "cpp_typecheckt::typecheck_compound_type: symbol_table.move() failed";
// put into scope
cpp_idt &id=cpp_scopes.put_into_scope(*new_symbol);
id.id_class=cpp_idt::TEMPLATE;
id.prefix=cpp_scopes.current_scope().prefix+
id2string(new_symbol->base_name);
// link the template symbol with the template scope
assert(template_scope.id_class==cpp_idt::TEMPLATE_SCOPE);
cpp_scopes.id_map[symbol_name] = &template_scope;
}
void cpp_typecheckt::convert_template_declaration(
cpp_declarationt &declaration)
{
assert(declaration.is_template());
if(declaration.member_spec().is_virtual())
{
err_location(declaration);
str << "invalid use of 'virtual' in template declaration";
throw 0;
}
if(declaration.is_typedef())
{
err_location(declaration);
str << "template declaration for typedef";
throw 0;
}
typet &type=declaration.type();
// there are
// 1) function templates
// 2) class templates
// 3) template members of class templates (static or methods)
// 4) variable templates (C++14)
if(declaration.is_class_template())
{
// there should not be declarators
if(!declaration.declarators().empty())
{
err_location(declaration);
throw "class template not expected to have declarators";
}
// it needs to be a class template
if(type.id()!=ID_struct)
{
err_location(declaration);
throw "expected class template";
}
// Is it class template specialization?
// We can tell if there are template arguments in the class name,
// like template<...> class tag<stuff> ...
if((static_cast<const cpp_namet &>(
type.find(ID_tag))).has_template_args())
{
convert_class_template_specialization(declaration);
return;
}
typecheck_class_template(declaration);
return;
}
else // maybe function template, maybe class template member, maye template variable
{
// there should be declarators in either case
if(declaration.declarators().empty())
{
err_location(declaration);
throw "non-class template is expected to have a declarator";
}
// Is it function template specialization?
// Only full specialization is allowed!
if(declaration.template_type().template_parameters().empty())
{
convert_template_function_or_member_specialization(declaration);
return;
}
// Explicit qualification is forbidden for function templates,
// which we can use to distinguish them.
assert(declaration.declarators().size()>=1);
cpp_declaratort &declarator=declaration.declarators()[0];
const cpp_namet &cpp_name=to_cpp_name(declarator.add(ID_name));
if(cpp_name.is_qualified() ||
cpp_name.has_template_args())
return typecheck_class_template_member(declaration);
// must be function template
typecheck_function_template(declaration);
return;
}
}
void cpp_typecheckt::typecheck_friend_declaration(
symbolt &symbol,
cpp_declarationt &declaration)
{
// A friend of a class can be a function/method,
// or a struct/class/union type.
if(declaration.is_template())
{
return; // TODO
err_location(declaration.type().location());
str << "friend template not supported";
throw 0;
}
// we distinguish these whether there is a declarator
if(declaration.declarators().empty())
{
typet &ftype=declaration.type();
// must be struct or union
if(ftype.id()!=ID_struct && ftype.id()!=ID_union)
{
err_location(declaration.type());
str << "unexpected friend";
throw 0;
}
if(ftype.find(ID_body).is_not_nil())
{
err_location(declaration.type());
str << "friend declaration must not have compound body";
throw 0;
}
// typecheck ftype
// TODO
// typecheck_type(ftype);
// assert(ftype.id()==ID_symbol);
// symbol.type.add("#friends").move_to_sub(ftype);
return;
}
// It should be a friend function.
// Do the declarators.
Forall_cpp_declarators(sub_it, declaration)
{
bool has_value = sub_it->value().is_not_nil();
if(!has_value)
{
// If no value is found, then we jump to the
// global scope, and we convert the declarator
// as if it were declared there
cpp_save_scopet saved_scope(cpp_scopes);
cpp_scopes.go_to_global_scope();
cpp_declarator_convertert cpp_declarator_converter(*this);
const symbolt &conv_symb = cpp_declarator_converter.convert(
declaration.type(), declaration.storage_spec(),
declaration.member_spec(), *sub_it);
exprt symb_expr = cpp_symbol_expr(conv_symb);
symbol.type.add("#friends").move_to_sub(symb_expr);
}
else
{
cpp_declarator_convertert cpp_declarator_converter(*this);
cpp_declarator_converter.is_friend = true;
declaration.member_spec().set_inline(true);
const symbolt &conv_symb = cpp_declarator_converter.convert(
declaration.type(), declaration.storage_spec(),
declaration.member_spec(), *sub_it);
exprt symb_expr = cpp_symbol_expr(conv_symb);
symbol.type.add("#friends").move_to_sub(symb_expr);
}
}