Rev 2 | Go to most recent revision | Blame | Compare with Previous | Last modification | View Log | RSS feed
/*
Crown Copyright (c) 1997
This TenDRA(r) Computer Program is subject to Copyright
owned by the United Kingdom Secretary of State for Defence
acting through the Defence Evaluation and Research Agency
(DERA). It is made available to Recipients with a
royalty-free licence for its use, reproduction, transfer
to other parties and amendment for any purpose not excluding
product development provided that any such use et cetera
shall be deemed to be acceptance of the following conditions:-
(1) Its Recipients shall ensure that this Notice is
reproduced upon any copies or amended versions of it;
(2) Any amended version of it shall be clearly marked to
show both the nature of and the organisation responsible
for the relevant amendment or amendments;
(3) Its onward transfer from a recipient to another
party shall be deemed to be that party's acceptance of
these conditions;
(4) DERA gives no warranty or assurance as to its
quality or suitability for any purpose and DERA accepts
no liability whatsoever in relation to any use to which
it may be put.
*/
/*** scope.c --- Scope stack ADT.
*
** Author: Steve Folkes <smf@hermes.mod.uk>
*
*** Commentary:
*
* This file implements the scope stack manipulation routines.
*
*** Change Log:
* $Log: scope.c,v $
* Revision 1.1.1.1 1998/01/17 15:57:47 release
* First version to be checked into rolling release.
*
* Revision 1.2 1994/12/15 09:59:02 smf
* Brought into line with OSSG C Coding Standards Document, as per
* "CR94_178.sid+tld-update".
*
* Revision 1.1.1.1 1994/07/25 16:04:42 smf
* Initial import of SID 1.8 non shared files.
*
**/
/****************************************************************************/
#include "scope.h"
#include "gen-errors.h"
#include "rule.h"
/*--------------------------------------------------------------------------*/
void
scope_stack_init PROTO_N ((stack))
PROTO_T (ScopeStackP stack)
{
stack->head = NIL (ScopeStackFrameP);
}
void
scope_stack_push PROTO_N ((stack, scope))
PROTO_T (ScopeStackP stack X
NStringP scope)
{
ScopeStackFrameP frame = ALLOCATE (ScopeStackFrameT);
DStringT dstring;
dstring_init (&dstring);
if (frame->head) {
dstring_append_nstring (&dstring, &(stack->head->scope));
}
dstring_append_nstring (&dstring, scope);
dstring_append_cstring (&dstring, "::");
dstring_to_nstring (&dstring, &(frame->scope));
dstring_destroy (&dstring);
frame->next = stack->head;
frame->head = NIL (ScopeMapEntryP);
frame->tail = &(frame->head);
stack->head = frame;
}
void
scope_stack_pop PROTO_N ((stack))
PROTO_T (ScopeStackP stack)
{
ScopeStackFrameP frame = stack->head;
ScopeMapEntryP entry;
ScopeMapEntryP next;
ASSERT (frame);
stack->head = frame->next;
nstring_destroy (&(frame->scope));
for (entry = frame->head; entry; entry = next) {
next = entry->next;
DEALLOCATE (entry);
}
DEALLOCATE (frame);
}
EntryP
scope_stack_add_rule PROTO_N ((stack, table, key, rule, found_ref))
PROTO_T (ScopeStackP stack X
TableP table X
NStringP key X
RuleP rule X
BoolT *found_ref)
{
*found_ref = FALSE;
if (stack->head) {
DStringT dstring;
NStringT nstring;
EntryP entry;
dstring_init (&dstring);
dstring_append_nstring (&dstring, &(stack->head->scope));
dstring_append_nstring (&dstring, key);
dstring_to_nstring (&dstring, &nstring);
dstring_destroy (&dstring);
if ((entry = table_get_rule (table, &nstring)) != NIL (EntryP)) {
*found_ref = TRUE;
nstring_destroy (&nstring);
return (entry);
} else if ((entry = table_add_rule (table, &nstring)) !=
NIL (EntryP)) {
EntryP from = table_add_name (table, key);
ScopeMapEntryP map = ALLOCATE (ScopeMapEntryT);
(void) scope_stack_check_shadowing (stack, from, rule);
map->next = NIL (ScopeMapEntryP);
map->from = from;
map->to = entry;
*(stack->head->tail) = map;
stack->head->tail = &(map->next);
return (entry);
} else {
nstring_destroy (&nstring);
return (NIL (EntryP));
}
} else {
if (table_get_rule (table, key)) {
*found_ref = TRUE;
}
return (table_add_rule (table, key));
}
}
EntryP
scope_stack_add_action PROTO_N ((stack, table, key, rule, found_ref))
PROTO_T (ScopeStackP stack X
TableP table X
NStringP key X
RuleP rule X
BoolT *found_ref)
{
*found_ref = FALSE;
if (stack->head) {
DStringT dstring;
NStringT nstring;
EntryP entry;
dstring_init (&dstring);
dstring_append_nstring (&dstring, &(stack->head->scope));
dstring_append_nstring (&dstring, key);
dstring_to_nstring (&dstring, &nstring);
dstring_destroy (&dstring);
if ((entry = table_get_action (table, &nstring)) != NIL (EntryP)) {
*found_ref = TRUE;
nstring_destroy (&nstring);
return (entry);
} else if ((entry = table_add_action (table, &nstring)) !=
NIL (EntryP)) {
EntryP from = table_add_name (table, key);
ScopeMapEntryP map = ALLOCATE (ScopeMapEntryT);
(void) scope_stack_check_shadowing (stack, from, rule);
map->next = NIL (ScopeMapEntryP);
map->from = from;
map->to = entry;
*(stack->head->tail) = map;
stack->head->tail = &(map->next);
return (entry);
} else {
nstring_destroy (&nstring);
return (NIL (EntryP));
}
} else {
if (table_get_action (table, key)) {
*found_ref = TRUE;
}
return (table_add_action (table, key));
}
}
EntryP
scope_stack_add_non_local PROTO_N ((stack, table, key, type, rule))
PROTO_T (ScopeStackP stack X
TableP table X
NStringP key X
EntryP type X
RuleP rule)
{
DStringT dstring;
NStringT nstring;
EntryP entry;
ASSERT (stack->head);
dstring_init (&dstring);
dstring_append_nstring (&dstring, &(stack->head->scope));
dstring_append_nstring (&dstring, key);
dstring_to_nstring (&dstring, &nstring);
dstring_destroy (&dstring);
if ((entry = table_add_non_local (table, &nstring, type)) !=
NIL (EntryP)) {
EntryP from = table_add_name (table, key);
ScopeMapEntryP map = ALLOCATE (ScopeMapEntryT);
(void) scope_stack_check_shadowing (stack, from, rule);
map->next = NIL (ScopeMapEntryP);
map->from = from;
map->to = entry;
*(stack->head->tail) = map;
stack->head->tail = &(map->next);
return (entry);
} else {
nstring_destroy (&nstring);
return (NIL (EntryP));
}
}
EntryP
scope_stack_get_rule PROTO_N ((stack, table, key))
PROTO_T (ScopeStackP stack X
TableP table X
NStringP key)
{
EntryP entry = table_get_entry (table, key);
if (entry) {
ScopeStackFrameP frame = stack->head;
for (; frame; frame = frame->next) {
ScopeMapEntryP map = frame->head;
for (; map; map = map->next) {
if (map->from == entry) {
if (entry_is_rule (map->to)) {
return (map->to);
} else {
return (NIL (EntryP));
}
}
}
}
if (entry_is_rule (entry)) {
return (entry);
}
}
return (NIL (EntryP));
}
EntryP
scope_stack_get_action PROTO_N ((stack, table, key))
PROTO_T (ScopeStackP stack X
TableP table X
NStringP key)
{
EntryP entry = table_get_entry (table, key);
if (entry) {
ScopeStackFrameP frame = stack->head;
for (; frame; frame = frame->next) {
ScopeMapEntryP map = frame->head;
for (; map; map = map->next) {
if (map->from == entry) {
if (entry_is_action (map->to)) {
return (map->to);
} else {
return (NIL (EntryP));
}
}
}
}
if (entry_is_action (entry)) {
return (entry);
}
}
return (NIL (EntryP));
}
EntryP
scope_stack_get_non_local PROTO_N ((stack, table, key, scope))
PROTO_T (ScopeStackP stack X
TableP table X
NStringP key X
NStringP scope)
{
EntryP entry = table_get_entry (table, key);
if (entry) {
ScopeStackFrameP frame = stack->head;
for (; frame; frame = frame->next) {
ScopeMapEntryP map = frame->head;
for (; map; map = map->next) {
if (map->from == entry) {
if (entry_is_non_local (map->to)) {
nstring_copy (scope, &(frame->scope));
return (map->to);
} else {
return (NIL (EntryP));
}
}
}
}
}
return (NIL (EntryP));
}
BoolT
scope_stack_check_shadowing PROTO_N ((stack, from, rule))
PROTO_T (ScopeStackP stack X
EntryP from X
RuleP rule)
{
ScopeStackFrameP frame = stack->head;
for (; frame; frame = frame->next) {
ScopeMapEntryP entry;
for (entry = frame->head; entry; entry = entry->next) {
if (entry->from == from) {
E_shadows_non_local (entry_key (from), entry_key (entry->to),
rule);
return (TRUE);
}
}
}
if (entry_is_rule (from) || entry_is_action (from) ||
entry_is_basic (from)) {
E_shadows_global (entry_key (from), rule);
return (TRUE);
}
return (FALSE);
}
/*
* Local variables(smf):
* eval: (include::add-path-entry "../os-interface" "../library")
* eval: (include::add-path-entry "../generated")
* end:
**/