static bool check_partial_ffi_call(pass_opt_t* opt, ast_t* ast)
{
pony_assert(ast_id(ast) == TK_FFICALL);
AST_GET_CHILDREN(ast, call_name, call_ret_typeargs, args, named_args,
call_error);
// The expr pass (expr_ffi) should have stored the declaration here, if found.
ast_t* decl = (ast_t*)ast_data(ast);
if(decl == NULL) {
if(ast_id(call_error) == TK_QUESTION)
ast_seterror(ast);
} else {
pony_assert(ast_id(decl) == TK_FFIDECL);
AST_GET_CHILDREN(decl, decl_name, decl_ret_typeargs, params, named_params,
decl_error);
if((ast_id(decl_error) == TK_QUESTION) ||
(ast_id(call_error) == TK_QUESTION))
ast_seterror(ast);
if((ast_id(decl_error) == TK_NONE) && (ast_id(call_error) != TK_NONE))
{
ast_error(opt->check.errors, call_error,
"call is partial but the declaration is not");
ast_error_continue(opt->check.errors, decl_error,
"declaration is here");
return false;
}
}
return true;
}
static bool check_partial_function_call(pass_opt_t* opt, ast_t* ast)
{
pony_assert((ast_id(ast) == TK_FUNREF) || (ast_id(ast) == TK_FUNCHAIN) ||
(ast_id(ast) == TK_NEWREF));
AST_GET_CHILDREN(ast, receiver, method);
// Receiver might be wrapped in another funref/newref
// if the method had type parameters for qualification.
if(ast_id(receiver) == ast_id(ast))
AST_GET_CHILDREN_NO_DECL(receiver, receiver, method);
// Look up the original method definition for this method call.
ast_t* method_def = lookup(opt, receiver, ast_type(receiver),
ast_name(method));
pony_assert(ast_id(method_def) == TK_FUN || ast_id(method_def) == TK_BE ||
ast_id(method_def) == TK_NEW);
token_id can_error = ast_id(ast_childidx(method_def, 5));
if(can_error == TK_QUESTION)
ast_seterror(ast);
ast_free_unattached(method_def);
return true;
}
ast_result_t pass_verify(ast_t** astp, pass_opt_t* options)
{
ast_t* ast = *astp;
bool r = true;
switch(ast_id(ast))
{
case TK_FUN:
case TK_NEW:
case TK_BE: r = verify_fun(options, ast); break;
case TK_FUNREF:
case TK_FUNCHAIN:
case TK_NEWREF: r = verify_function_call(options, ast); break;
case TK_BEREF:
case TK_BECHAIN:
case TK_NEWBEREF: r = verify_behaviour_call(options, ast); break;
case TK_FFICALL: r = verify_ffi_call(options, ast); break;
case TK_TRY:
case TK_TRY_NO_CHECK: r = verify_try(options, ast); break;
case TK_LETREF:
case TK_VARREF:
case TK_FLETREF:
case TK_FVARREF:
case TK_EMBEDREF:
case TK_CALL:
case TK_QUALIFY:
case TK_TUPLE:
case TK_ASSIGN:
case TK_MATCH:
case TK_CASES:
case TK_CASE:
case TK_IS:
case TK_ISNT:
case TK_SEQ:
case TK_BREAK:
case TK_RETURN:
case TK_IF:
case TK_IFDEF:
case TK_WHILE:
case TK_REPEAT:
case TK_RECOVER:
case TK_POSITIONALARGS:
case TK_NAMEDARGS:
case TK_NAMEDARG:
case TK_UPDATEARG: ast_inheritflags(ast); break;
case TK_ERROR: ast_seterror(ast); break;
default: {}
}
if(!r)
{
assert(errors_get_count(options->check.errors) > 0);
return AST_ERROR;
}
return AST_OK;
}
bool expr_error(ast_t* ast)
{
// error is always the last expression in a sequence
assert(ast_sibling(ast) == NULL);
ast_settype(ast, ast_from(ast, TK_ERROR));
ast_seterror(ast);
return true;
}
ast_result_t expr_ffi(pass_opt_t* opt, ast_t* ast)
{
if(!package_allow_ffi(&opt->check))
{
ast_error(opt->check.errors, ast, "This package isn't allowed to do C FFI");
return AST_FATAL;
}
AST_GET_CHILDREN(ast, name, return_typeargs, args, namedargs, question);
assert(name != NULL);
ast_t* decl;
if(!ffi_get_decl(&opt->check, ast, &decl, opt))
return AST_ERROR;
if(decl != NULL) // We have a declaration
return declared_ffi(opt, ast, decl);
// We do not have a declaration
for(ast_t* arg = ast_child(args); arg != NULL; arg = ast_sibling(arg))
{
ast_t* a_type = ast_type(arg);
if((a_type != NULL) && is_type_literal(a_type))
{
ast_error(opt->check.errors, arg,
"Cannot pass number literals as unchecked FFI arguments");
return AST_ERROR;
}
}
ast_t* return_type = ast_child(return_typeargs);
if(return_type == NULL)
{
ast_error(opt->check.errors, name,
"FFIs without declarations must specify return type");
return AST_ERROR;
}
ast_settype(ast, return_type);
ast_inheritflags(ast);
if(ast_id(question) == TK_QUESTION)
ast_seterror(ast);
return AST_OK;
}
static bool method_access(pass_opt_t* opt, ast_t* ast, ast_t* method)
{
AST_GET_CHILDREN(method, cap, id, typeparams, params, result, can_error,
body);
switch(ast_id(method))
{
case TK_NEW:
{
AST_GET_CHILDREN(ast, left, right);
ast_t* type = ast_type(left);
if(is_typecheck_error(type))
return false;
if(!constructor_type(opt, ast, ast_id(cap), type, &result))
return false;
break;
}
case TK_BE:
ast_setid(ast, TK_BEREF);
break;
case TK_FUN:
ast_setid(ast, TK_FUNREF);
break;
default:
assert(0);
return false;
}
ast_settype(ast, type_for_fun(method));
if(ast_id(can_error) == TK_QUESTION)
ast_seterror(ast);
return is_method_called(opt, ast);
}
bool expr_try(pass_opt_t* opt, ast_t* ast)
{
AST_GET_CHILDREN(ast, body, else_clause, then_clause);
// It has to be possible for the left side to result in an error.
if((ast_id(ast) == TK_TRY) && !ast_canerror(body))
{
ast_error(body, "try expression never results in an error");
return false;
}
ast_t* body_type = ast_type(body);
ast_t* else_type = ast_type(else_clause);
ast_t* then_type = ast_type(then_clause);
if(is_typecheck_error(body_type) ||
is_typecheck_error(else_type) ||
is_typecheck_error(then_type))
return false;
ast_t* type = NULL;
if(!is_control_type(body_type))
type = control_type_add_branch(type, body);
if(!is_control_type(else_type))
type = control_type_add_branch(type, else_clause);
if(type == NULL)
{
if(ast_sibling(ast) != NULL)
{
ast_error(ast_sibling(ast), "unreachable code");
return false;
}
type = ast_from(ast, TK_TRY);
}
// The then clause does not affect the type of the expression.
if(is_control_type(then_type))
{
ast_error(then_clause, "then clause always terminates the function");
return false;
}
if(is_type_literal(then_type))
{
ast_error(then_clause, "Cannot infer type of unused literal");
return false;
}
ast_settype(ast, type);
// Doesn't inherit error from the body.
if(ast_canerror(else_clause) || ast_canerror(then_clause))
ast_seterror(ast);
if(ast_cansend(body) || ast_cansend(else_clause) || ast_cansend(then_clause))
ast_setsend(ast);
if(ast_mightsend(body) || ast_mightsend(else_clause) ||
ast_mightsend(then_clause))
ast_setmightsend(ast);
literal_unify_control(ast, opt);
// Push the symbol status from the then clause to our parent scope.
ast_inheritstatus(ast_parent(ast), then_clause);
return true;
}
static ast_result_t declared_ffi(pass_opt_t* opt, ast_t* call, ast_t* decl)
{
assert(call != NULL);
assert(decl != NULL);
assert(ast_id(decl) == TK_FFIDECL);
AST_GET_CHILDREN(call, call_name, call_ret_typeargs, args, named_args,
call_error);
AST_GET_CHILDREN(decl, decl_name, decl_ret_typeargs, params, named_params,
decl_error);
// Check args vs params
ast_t* param = ast_child(params);
ast_t* arg = ast_child(args);
while((arg != NULL) && (param != NULL) && ast_id(param) != TK_ELLIPSIS)
{
ast_t* p_type = ast_childidx(param, 1);
if(!coerce_literals(&arg, p_type, opt))
return AST_ERROR;
ast_t* a_type = ast_type(arg);
errorframe_t info = NULL;
if((a_type != NULL) &&
!void_star_param(p_type, a_type) &&
!is_subtype(a_type, p_type, &info, opt))
{
errorframe_t frame = NULL;
ast_error_frame(&frame, arg, "argument not a subtype of parameter");
ast_error_frame(&frame, param, "parameter type: %s",
ast_print_type(p_type));
ast_error_frame(&frame, arg, "argument type: %s",
ast_print_type(a_type));
errorframe_append(&frame, &info);
errorframe_report(&frame, opt->check.errors);
return AST_ERROR;
}
arg = ast_sibling(arg);
param = ast_sibling(param);
}
if(arg != NULL && param == NULL)
{
ast_error(opt->check.errors, arg, "too many arguments");
return AST_ERROR;
}
if(param != NULL && ast_id(param) != TK_ELLIPSIS)
{
ast_error(opt->check.errors, named_args, "too few arguments");
return AST_ERROR;
}
for(; arg != NULL; arg = ast_sibling(arg))
{
ast_t* a_type = ast_type(arg);
if((a_type != NULL) && is_type_literal(a_type))
{
ast_error(opt->check.errors, arg,
"Cannot pass number literals as unchecked FFI arguments");
return AST_ERROR;
}
}
// Check return types
ast_t* call_ret_type = ast_child(call_ret_typeargs);
ast_t* decl_ret_type = ast_child(decl_ret_typeargs);
errorframe_t info = NULL;
if((call_ret_type != NULL) &&
!is_eqtype(call_ret_type, decl_ret_type, &info, opt))
{
errorframe_t frame = NULL;
ast_error_frame(&frame, call_ret_type,
"call return type does not match declaration");
errorframe_append(&frame, &info);
errorframe_report(&frame, opt->check.errors);
return AST_ERROR;
}
// Check partiality
if((ast_id(decl_error) == TK_NONE) && (ast_id(call_error) != TK_NONE))
{
ast_error(opt->check.errors, call_error,
"call is partial but the declaration is not");
return AST_ERROR;
}
if((ast_id(decl_error) == TK_QUESTION) ||
(ast_id(call_error) == TK_QUESTION))
{
ast_seterror(call);
}
// Store the declaration so that codegen can generate a non-variadic
// signature for the FFI call.
ast_setdata(call, decl);
ast_settype(call, decl_ret_type);
ast_inheritflags(call);
return AST_OK;
}