void block()
{
int prev_mod = mod;
level++;
mod = 4;
if(current_token.type == constsym) const_decl();
if(current_token.type == varsym) var_decl();
if(current_token.type == procsym) proc_decl();
emit(INC, 0,mod);
statement();
level--;
mod = prev_mod;
}
m1_expression *
constdecl(M1_compiler *comp, char *type, char *name, m1_expression *e) {
m1_expression *expr = expression(comp, EXPR_CONSTDECL);
expr->expr.c = const_decl(type, name, e);
return expr;
}
void adasem(Node node) /*;adasem*/
{
/* This is the driver routine for all semantic processing. It is called
* by the parser whenever the syntax tree for a compilation unit has
* been built. The input to this routine is an AST node, on which two
* maps are defined : AST, and SPANS. These maps are global to the front
* end.
*/
Node n1, n2, n3, n4;
char *id, *op_id;
Fortup ft1;
Tuple tup;
Node decl_node, id_node, l;
Symbol package, s1;
if (cdebug2 > 2) {
/* TO_ERRFILE("node type ");*/
#ifdef IBM_PC
printf("node type: %s %d %p\n", kind_str(N_KIND(node)), N_KIND(node),
node);
#else
printf("node type: %s %d %ld\n", kind_str(N_KIND(node)), N_KIND(node),
node);
#endif
}
/* The current node is placed in a global variable, from which the error
* routines can extract its span.
*/
current_node = node;
#ifdef DEBUG
if (trapns>0 && N_SEQ(node) == trapns && N_UNIT(node) == trapnu)trapn(node);
#endif
switch(N_KIND(node)) {
/* Chapter 2. Lexical elements*/
/* pragma -> [as_pragma identifier argument_list]*/
case(as_pragma):
process_pragma(node);
break;
/* argument_association -> [as_arg identifier expression]*/
case(as_arg):
break; /*Unpacked in process_pragmas.*/
/* Chapter 3. Declarations and types */
/* object_declaration -> [as_obj_decl identifier_list subtype_indic
* opt_expression]
*/
case(as_obj_decl):
obj_decl(node);
break;
/* const_declaration -> ['const_decl' identifier_list subtype_indic
* opt_expression]
*/
case(as_const_decl):
const_decl(node);
break;
/* num_declaration -> ['num_decl' identifier_list expression]*/
case(as_num_decl):
number_decl(node);
break;
/* type_decl -> ['type_decl' identifier discriminant_list
* type_definition]
*/
case(as_type_decl):
type_decl(node);
break;
/* Subtype_decl -> ['subtype_decl' identifier subtype_indic]*/
case(as_subtype_decl):
subtype_decl(node);
break;
/* subtype_indication -> ['subtype_indic', name opt_constraint]*/
case(as_subtype_indic):
/*[name, opt_constraint] := N_AST(node);*/
adasem(N_AST1(node));
adasem(N_AST2(node));
break;
/* derived_type_definition -> ['derived_type' subtype_indication]*/
case(as_derived_type):
break;
/* discrete_range -> ['range' expression expression]*/
case(as_range):
/*[expression1, expression2] := N_AST(node);*/
adasem(N_AST1(node));
adasem(N_AST2(node));
break;
/* range_attribute -> ['range_attribute' name range]*/
case(as_range_attribute):
N_KIND(node) = as_attribute;
n2 = N_AST3(node);
find_old(node);
adasem(n2);
break;
/* discrete_range -> ['range_expression' expression]*/
case(as_range_expression):
adasem(N_AST1(node));
break;
/* constraint -> ['constraint' general_aggregate]*/
case(as_constraint):
sem_list(node);
break;
/* enumeration_type -> [as_enum enumeration_literal_list]*/
case(as_enum):
sem_list(node);
break;
case(as_int_type):
break;
case(as_float_type):
break;
case(as_fixed_type):
break;
case(as_digits):
case(as_delta):
adasem(N_AST1(node));
adasem(N_AST2(node));
break;
/* array_type_definition -> ['array_type' index_list subtype_indication]*/
case(as_array_type):
array_typedef(node);
break;
/* subtype_definition -> ['box' name]*/
case(as_box):
adasem(N_AST1(node));
break;
/* discrete_range -> [as_subtype opt_name range_constraint]
* general_component_association ->[as_subtype opt_name range-constraint]
*/
case(as_subtype):
/*[opt_name, range_constraint] := N_AST(node);*/
n1 = N_AST1(node);
n2 = N_AST2(node);
if (n1 != OPT_NODE) {
adasem(n1);
find_old(n1);
}
if (n2 == OPT_NODE) { /* possible, if syntax error */
N_KIND(node) = as_name;
}
else adasem(n2);
break;
/* record_decl -> [as_record component_list]*/
case(as_record):
adasem(N_AST1(node));
break;
/* component_list -> [ 'component_list' component_decl_list variant]*/
case(as_component_list):
/*[component_decl_list, variant] := N_AST(node);*/
sem_list(N_AST1(node));
adasem(N_AST2(node));
break;
/* component_declaration -> ['field' identifier_list subtype_indic
* opt_expression]
*/
case(as_field):
comp_decl(node);
break;
/* discr_specification -> ['discr_spec' identifier_list name opt_expr]*/
case(as_discr_spec):
/*[id_list_node, name, opt_expr] := N_AST(node);*/
adasem(N_AST2(node));
/* adasem(N_AST3(node)); */
break;
/* variant_part -> ['variant_decl' simple_name variant_list]*/
case(as_variant_decl):
variant_decl(node);
break;
/* component_association -> ['choice_list' choice_list expression]*/
case(as_choice_list):
/*[choice_list, expression] := N_AST(node);*/
sem_list(N_AST1(node));
adasem(N_AST2(node));
break;
case(as_simple_choice):
adasem(N_AST1(node));
break;
case(as_range_choice):
adasem(N_AST1(node));
break;
case(as_others_choice):
break;
case(as_choice_unresolved):
adasem(N_AST1(node));
break;
case(as_access_type):
n1 = N_AST1(node);
adasem(n1);
n2 = N_AST1(n1);
n3 = N_AST2(n1);
if (n3 == OPT_NODE ) {
/*Special case: type mark may be an incomplete type.*/
N_UNQ(n1) = find_type(n2);
}
else { /* elaborate subtype indication*/
N_UNQ(n1) = promote_subtype(make_subtype(n1));
}
break;
/* incomplete_type_decl -> ['incomplete_decl' identifier discriminant]*/
case(as_incomplete_decl):
incomplete_decl(node);
break;
/* declarations -> ['declarations' declaration_list]*/
case(as_declarations):
declarative_part(node);
break;
/* Chapter 4. Names and expressions */
/* name -> ['character_literal' character]
* Character literals also appear as enumeration literals, and as
* selectors.
*/
case(as_character_literal):
break;
/* name -> ['simple_name' identifier]*/
case(as_simple_name):
break;
/* name -> ['call?' name general_aggregate]*/
case(as_call_unresolved):
n1 = N_AST1(node);
n2 = N_AST2(node);
if (N_KIND(n1) == as_string) {
/* Operator designator: reduce to lower case.*/
/*N_VAL(n1) = LOWER_CASE_OF(N_VAL(n1));*/
id = N_VAL(n1);
while(*id) {
if (isupper(*id)) *id = tolower(*id);
id++;
}
}
adasem(n1);
FORTUP(n1 = (Node), N_LIST(n2), ft1);
adasem(n1);
ENDFORTUP(ft1);
break;
/* name -> ['operator' operator_symbol]*/
case(as_operator):
N_KIND(node) = as_simple_name;
break;
case(as_string):
N_KIND(node) = as_simple_name;
break;
/* name -> ['.' name selector]*/
case(as_selector):
adasem(N_AST1(node));
break;
case(as_all):
adasem(N_AST1(node));
break;
case(as_attribute):
adasem(N_AST2(node));
adasem(N_AST3(node));
break;
/* aggregate -> [as_aggregate expression_list]*/
case(as_aggregate):
sem_list(node);
break;
/* parenthesised_expression -> ['()', expression]*/
case(as_parenthesis):
adasem(N_AST1(node) );
break;
/* expression -> [operator_designator <expression..>]*/
case(as_op):
case(as_un_op):
/*[op_node, arg_list] := N_AST(node);*/
n1 = N_AST1(node);
op_id = N_VAL(n1);
/* KLUDGE until parser fixed. */
if (streq(op_id, "NOT")) N_VAL(n1) = strjoin("not", "");
else if (streq(op_id, "AND")) N_VAL(n1) = strjoin("and", "");
else if (streq(op_id, "XOR")) N_VAL(n1) = strjoin("xor", "");
else if (streq(op_id, "REM")) N_VAL(n1) = strjoin("rem", "");
else if (streq(op_id, "MOD")) N_VAL(n1) = strjoin("mod", "");
else if (streq(op_id, "OR")) N_VAL(n1) = strjoin("or", "");
n2 = N_AST2(node);
find_old(n1);
FORTUP(n3 = (Node), N_LIST(n2), ft1);
adasem(n3);
/*
* the call to check_range_attribute is useless, since
* adasem converts as_range_attribute to as_attribute
* (gcs 11 feb)
*/
/* check_range_attribute(n3); */
ENDFORTUP(ft1);
break;
case(as_in):
case(as_notin):
n3 = N_AST2(node);
tup = N_LIST(n3);
n1 = (Node) tup[1];
n2 = (Node) tup[2];
adasem(n1);
adasem(n2);
break;
case(as_int_literal):
break;
case(as_real_literal):
break;
case(as_string_literal):
break;
case(as_null):
break;
case(as_name):
adasem(N_AST1(node));
break;
case(as_qualify):
find_type(N_AST1(node));
adasem(N_AST2(node));
break;
/* allocator -> ['new_init' name aggregate]*/
case(as_new_init):
n1 = N_AST1(node);
n2 = N_AST2(node);
adasem(n1);
adasem(n2);
break;
/* allocator -> ['new' name constraint_list]*/
case(as_new):
n1 = N_AST1(node);
n2 = N_AST2(node);
adasem(n1);
sem_list(n2);
break;
/* Chapter 5. Statements*/
/* sequence_of_statements -> ['statements' statement_list, label_list]*/
case(as_statements):
statement_list(node);
break;
/* statement -> ['statement' label_list statement]*/
case(as_statement):
/*[label_list, stmt] := N_AST(node);*/
n1= N_AST1(node);
n2= N_AST2(node);
FORTUP(l = (Node), N_LIST(n1), ft1);
find_old(l);
if (NATURE(N_UNQ(l)) != na_label) {
errmsg("label hidden by inner declaration", "5.1", l);
}
ENDFORTUP(ft1);
adasem(n2);
break;
/* labels_declaration -> ['labels' label_list]*/
case(as_labels):
label_decl(node);
break;
/* null_statement -> [null_s']*/
case(as_null_s):
break;
/* assignment -> [':=' name expression ]*/
case(as_assignment):
assign_statement(node);
break;
/* if_statement -> ['if' if_part_list opt_else]*/
case(as_if):
if_statement(node);
break;
/* condition -> ['condition' expression]*/
case(as_condition):
n1 = N_AST1(node);
adasem(n1);
check_type(symbol_boolean_type, n1);
break;
/* case_statement -> ['case' expression alt_list]*/
case(as_case):
case_statement(node);
break;
/* loop_statement -> ['loop' opt_loop_id iteration_rule statements]*/
case(as_loop):
loop_statement(node);
break;
/* iteration_rule -> ['while' condition]*/
case(as_while):
adasem(N_AST1(node));
break;
/* iteration rule -> ['for' identifier discrete_range]*/
case(as_for):
iter_var(node);
break;
/* iteration_rule -> ['forrev' identifier discrete_range]*/
case(as_forrev):
iter_var(node);
break;
/* block -> [na_block identifier declarations statements exceptions]*/
case(as_block):
new_block(node);
break;
/* exit_statement -> ['exit' opt_name opt_expression]*/
case(as_exit):
exit_statement(node);
break;
/* return_statement -> ['return' opt_expression]*/
case(as_return):
return_statement(node);
break;
case(as_goto):
goto_statement(node);
break;
/* Chapter 6. Subprograms*/
/* subprogram_declaration -> ['subprogram_decl', subprogram_spec]*/
case(as_subprogram_decl):
subprog_decl(node);
break;
/* subprogram_specification -> [na_procedure identifier formals_list]
* -> [na_function identifier formals_list name]
*/
case(as_procedure):
break;
case(as_function):
find_type(N_AST3(node));
break;
/* subprogram_body -> ['subprogram' subprogram_spec declarations
* statements opt_exceptions]
*/
case(as_subprogram):
subprog_body(node);
break;
/* parameter_specification -> ['formal' id_list mode name opt_expression]*/
case(as_formal):
break;
/* mode -> ['mode' identifier]*/
case(as_mode):
break;
/* call_statement -> ['call' name]*/
case(as_call):
call_statement(node);
break;
/* Chapter 7. Packages*/
/* package_specification -> [na_package_spec identifier declarations
* opt_private_part]
*/
case(as_package_spec):
package_specification(node);
break;
/* package_body -> ['package_body' identifier declarations
* opt_statements opt_handler]
*/
case(as_package_body):
id_node = N_AST1(node);
decl_node = N_AST2(node);
n3 = N_AST3(node);
n4 = N_AST4(node);
module_body_id(na_package, id_node);
adasem(decl_node);
adasem(n3);
adasem(n4);
force_all_types();
module_body(na_package, node);
package = N_UNQ(id_node);
if (NATURE(package) == na_generic_package)
N_KIND(node) = as_generic_package;
break;
/* private_type_declaration -> ['private_decl' identifier
* discriminant_list priv_kind]
*/
case(as_private_decl):
private_decl(node);
break;
/* Chapter 8. Visibility rules*/
/* use_clause -> [use' identifier_list]*/
case(as_use):
use_clause(node);
break;
/* renaming_declaration -> ['rename_ex' identifier name]*/
case(as_rename_ex):
rename_ex(node);
break;
/* renaming_declaration -> ['rename_pack' identifier name]*/
case(as_rename_pack):
rename_pack(node);
break;
/* renaming_declaration -> ['rename_obj' identifier type_mark name]*/
case(as_rename_obj):
rename_object(node);
break;
/* renaming declarations -> ['rename_sub' subprogam_spec name]*/
case(as_rename_sub):
rename_subprogram(node);
break;
/* Chapter 9. Tasks */
/* task_specification -> [task_kind identifier opt_entry_declaration
* opt_rep_clause]
* task_kind -> 'task_spec'
* -> na_task_type_spec
*/
case(as_task_spec):
case(as_task_type_spec):
/* clear N_AST3 as specification not supported now, and
* need this field for N_TYPE DS 9-21-86
*/
N_AST3(node) = (Node)0;
task_spec(node);
break;
/* task_body -> ['task' identifier declarations statements
* opt_exceptions]
*/
case(as_task):
/*[id_node, decls, stmts, excepts] := N_AST(node);*/
id_node = N_AST1(node);
n2 = N_AST2(node);
n3 = N_AST3(node);
n4 = N_AST4(node);
module_body_id(na_task_type, id_node);
/* clear the private_decls field set in module_body_id as this is */
/* irrelevant to tasks. */
private_decls(N_UNQ(id_node)) = (Set)0;
adasem(n2);
adasem(n3);
adasem(n4);
module_body(na_task_type, node);
s1 = N_UNQ(id_node);
check_incomplete_decls(s1, node);
break;
/* entry_declaration -> [na_entry identifier formals_list]*/
case(as_entry):
entry_decl(node);
break;
/* * entry_declaration -> [na_entry_family identifier discrete_range
* formals_list]
*/
case(as_entry_family):
entry_family_decl(node);
break;
/* accept_statement -> ['accept' name opt_expression opt_formal_part
* opt_statements]
*/
case(as_accept):
accept_statement(node);
break;
/* delay_statement -> ['delay' expression]*/
case(as_delay):
n1 = N_AST1(node);
adasem(n1);
check_type(symbol_duration, n1);
break;
/* selective_wait -> ['selective_wait' alternative_list else_part]*/
case(as_selective_wait):
n1 = N_AST1(node);
n2 = N_AST2(node);
sem_list(n1);
if (n2 != OPT_NODE)
adasem(n2);
break;
/* select_alternative -> ['guard' condition selective_wait_alternative]*/
case(as_guard):
adasem(N_AST1(node));
adasem(N_AST2(node));
break;
/* selective_wait_alternative -> ['accept_alt' accept_statement opt_stats]
* -> ['delay_alt' delay_statement opt_stats]
*/
case(as_accept_alt):
adasem(N_AST1(node));
adasem(N_AST2(node));
break;
case(as_delay_alt):
adasem(N_AST1(node));
adasem(N_AST2(node));
break;
/* selective_wait_alternative -> ['terminate_alt' ]*/
case(as_terminate_alt):
terminate_statement(node);
break;
/* conditional_entry_call -> ['conditional_entry_call' call_statement
* statements else_stat]
*/
case(as_conditional_entry_call):
check_entry_call(N_AST1(node));
adasem(N_AST2(node));
adasem(N_AST3(node));
break;
/* timed_entry_call -> ['timed_entry_call', call_statement statements
* delay_alternative]
*/
case(as_timed_entry_call):
check_entry_call(N_AST1(node));
adasem(N_AST2(node));
adasem(N_AST3(node));
break;
/* abort_statement -> ['abort' task_name_list]*/
case(as_abort):
abort_statement(node);
break;
/* Chapter 10. Program structure...*/
/* (as_compilation):
* This node is used for pragmas that precede a compilation unit.
* TBSL
*/
/* unit_declaration -> ['unit' context_clause unit_body]*/
case(as_unit):
compunit(node);
break;
/* context_clause -> ['with_use_list' [with_or_use...]]
* No action is necessary since this is handled in comp_unit
* body_stub -> ['subprogam_stub' subprogram_specification]
* -> ['package_stub' name]
* -> ['task_stub' name]
*/
case(as_subprogram_stub):
{
Symbol u_name;
n1 = N_AST1(node);
n2 = N_AST1(n1);
u_name = dcl_get(DECLARED(scope_name), N_VAL(n2));
/* For generic stubs ignore call to check_spec.
* TBSL: code for checking formals.
* Note: if uname is undefined here it indicates that the stub had
* no subprog declaration and therefore is certainly not generic.
*/
if (u_name != (Symbol)0
&& (NATURE(u_name) == na_generic_procedure_spec
|| NATURE(u_name) == na_generic_function_spec)) {
N_UNQ(n2) = u_name;
newscope(u_name);
adasem(n1);
popscope();
save_stub(node);
}
else {
adasem(n1);
check_spec(node);
u_name = N_UNQ(n2);
NATURE(u_name) = N_KIND(n1) == as_procedure ? na_procedure_spec
: na_function_spec;
if (in_op_designators(ORIG_NAME(u_name) ) ){
errmsg_l("Name of separately compiled unit cannot be ",
"an operator designator", "10.1", n2);
}
else {
save_stub(node);
}
}
}
break;
case(as_package_stub):
stub_head(na_package, node);
save_stub(node);
break;
case(as_task_stub):
stub_head(na_task, node);
save_stub(node);
break;
/* subunit -> ['separate' parent_name unit]*/
case(as_separate):
adasem(N_AST2(node));
break;
/* Chapter 11. Exceptions*/
/* Exception_declaration -> ['except_decl' identifier_list]*/
case(as_except_decl):
except_decl(node);
break;
/* exceptions -> ['exception' handler_list]*/
case(as_exception):
exception_part(node);
break;
/* exception_handler -> ['handler' exception_choice_list statements]*/
case(as_handler):
exception_handler(node);
break;
case(as_others):
break;
/* raise_statement -> ['raise opt_identifier]*/
case(as_raise):
raise_statement(node);
break;
/* Chapter 12. Generics*/
case(as_generic_procedure):
case(as_generic_function):
generic_subprog_spec(node);
break;
case(as_generic_package):
generic_pack_spec(node);
break;
/* Generic part -> ['generic_formals' generic_decl_list]*/
case(as_generic_formals):
/*$$$newtypes with:= []; $ Anonymous types may be created (???)*/
sem_list(node);
/*$$$ generic_list := []+/sem_list(2); and new_type_list*/
break;
/* Generic_formal -> ['generic_obj' id_list mode name opt_expression]*/
case(as_generic_obj):
generic_obj_decl(node);
break;
/* Generic formal -> ['generic_type' identifier type_def]*/
case(as_generic_type):
generic_type_decl(node);
break;
/* Generic formal -> ['gen_priv_type' private_type_declaration]*/
case(as_gen_priv_type):
generic_priv_decl(node);
break;
/* Generic_formal -> ['generic_subp', subprogram_spec opt_is]*/
case(as_generic_subp):
generic_subp_decl(node);
break;
/* Generic_type_definition -> ['generic' identifier]*/
case(as_generic):
break;
/* Package_instance -> ['package_instance' identifier name instance_list]*/
case(as_package_instance):
package_instance(node);
break;
/* subprogram_instance
* -> ['function_instance' designator name generic_actual_part]
* -> ['procedure_instance' identifier name generic_actual_part]
*/
case(as_function_instance):
case(as_procedure_instance):
subprog_instance(node);
break;
/* generic_parameter_association->['instance' opt_identifier expression]*/
case(as_instance):
break;
/* Chapter 13. Representation specs...*/
/* length_clause -> ['length_clause' attribute simple_expression ]*/
case(as_length_clause):
length_clause (node);
break;
/*
* enumeration_representation_clause -> ['enum_rep_clause'
* simple_name aggregate ]
*/
case(as_enum_rep_clause):
enum_rep_clause (node);
break;
/*
* record_representation_clause ->
* ['rec_rep_clause' simple_name opt_align_clause comp_clause_list ]
*/
case(as_rec_rep_clause):
rec_rep_clause(node);
break;
/* component_clause -> ['compon_clause' name simple_expression range]*/
case(as_compon_clause):
adasem(N_AST1(node));
adasem(N_AST2(node));
adasem(N_AST3(node));
break;
/* address_clause -> ['address_clause' simple_name simple_expression]*/
case(as_address_clause):
break;
case(as_opt):
break;
case(as_line_no):
break;
default:
if (node == (Node)0) return;
/* above is single line added re OPT_NODE 4 jul*/
printf("adasem: invalid node %d kind %d\n", node, N_KIND(node));
errmsg_str("System error: invalid node %", kind_str(N_KIND(node)),
"none", node);
}
}
