336 lines
6.9 KiB
C
336 lines
6.9 KiB
C
/* D E F I N I T I O N M E C H A N I S M */
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#ifndef NORCSID
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static char *RcsId = "$Header$";
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#endif
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#include "debug.h"
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#include <alloc.h>
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#include <em_arith.h>
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#include <em_label.h>
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#include <assert.h>
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#include "main.h"
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#include "def.h"
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#include "type.h"
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#include "idf.h"
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#include "scope.h"
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#include "LLlex.h"
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#include "node.h"
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#include "Lpars.h"
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struct def *h_def; /* pointer to free list of def structures */
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#ifdef DEBUG
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int cnt_def; /* count number of allocated ones */
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#endif
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struct def *ill_df;
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struct def *
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MkDef(id, scope, kind)
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struct idf *id;
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register struct scope *scope;
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{
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/* Create a new definition structure in scope "scope", with
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id "id" and kind "kind".
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*/
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register struct def *df;
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df = new_def();
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clear((char *) df, sizeof (*df));
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df->df_idf = id;
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df->df_scope = scope;
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df->df_kind = kind;
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df->next = id->id_def;
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id->id_def = df;
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/* enter the definition in the list of definitions in this scope
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*/
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df->df_nextinscope = scope->sc_def;
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scope->sc_def = df;
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return df;
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}
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InitDef()
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{
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/* Initialize this module. Easy, the only thing to be initialized
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is "ill_df".
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*/
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struct idf *gen_anon_idf();
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ill_df = MkDef(gen_anon_idf(), CurrentScope, D_ERROR);
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ill_df->df_type = error_type;
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}
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struct def *
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define(id, scope, kind)
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register struct idf *id;
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register struct scope *scope;
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{
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/* Declare an identifier in a scope, but first check if it
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already has been defined. If so, error message.
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*/
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register struct def *df;
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df = lookup(id, scope);
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if ( /* Already in this scope */
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df
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|| /* A closed scope, and id defined in the pervasive scope */
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(
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scopeclosed(scope)
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&&
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(df = lookup(id, PervasiveScope)))
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) {
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switch(df->df_kind) {
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case D_HIDDEN:
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/* An opaque type. We may now have found the
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definition of this type.
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*/
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if (kind == D_TYPE && !DefinitionModule) {
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df->df_kind = D_TYPE;
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return df;
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}
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break;
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case D_FORWMODULE:
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/* A forward reference to a module. We may have found
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another one, or we may have found the definition
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for this module.
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*/
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if (kind == D_FORWMODULE) {
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return df;
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}
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if (kind == D_MODULE) {
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FreeNode(df->for_node);
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df->mod_vis = df->for_vis;
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df->df_kind = kind;
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DefInFront(df);
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return df;
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}
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break;
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case D_FORWARD:
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/* A forward reference, for which we may now have
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found a definition.
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*/
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if (kind != D_FORWARD) {
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FreeNode(df->for_node);
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}
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/* Fall through */
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case D_ERROR:
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/* A definition generated by the compiler, because
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it found an error. Maybe, the user gives a
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definition after all.
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*/
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df->df_kind = kind;
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return df;
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}
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if (kind != D_ERROR) {
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/* Avoid spurious error messages
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*/
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error("identifier \"%s\" already declared", id->id_text);
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}
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return df;
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}
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return MkDef(id, scope, kind);
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}
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RemoveImports(pdf)
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struct def **pdf;
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{
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/* Remove all imports from a definition module. This is
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neccesary because the implementation module might import
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them again.
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*/
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register struct def *df = *pdf;
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while (df) {
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if (df->df_kind == D_IMPORT) {
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RemoveFromIdList(df);
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*pdf = df->df_nextinscope;
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free_def(df);
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}
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else {
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pdf = &(df->df_nextinscope);
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}
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df = *pdf;
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}
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}
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RemoveFromIdList(df)
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struct def *df;
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{
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/* Remove definition "df" from the definition list
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*/
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register struct idf *id = df->df_idf;
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register struct def *df1;
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if (id->id_def == df) id->id_def = df->next;
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else {
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df1 = id->id_def;
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while (df1->next != df) {
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assert(df1->next != 0);
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df1 = df1->next;
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}
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df1->next = df->next;
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}
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}
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struct def *
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DeclProc(type)
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{
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/* A procedure is declared, either in a definition or a program
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module. Create a def structure for it (if neccessary).
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Also create a name for it.
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*/
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register struct def *df;
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extern char *sprint();
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static int nmcount;
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char buf[256];
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assert(type & (D_PROCEDURE | D_PROCHEAD));
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if (type == D_PROCHEAD) {
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/* In a definition module
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*/
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df = define(dot.TOK_IDF, CurrentScope, type);
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df->for_node = MkLeaf(Name, &dot);
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sprint(buf,"%s_%s",CurrentScope->sc_name,df->df_idf->id_text);
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df->for_name = Salloc(buf, (unsigned) (strlen(buf)+1));
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if (CurrVis == Defined->mod_vis) C_exp(df->for_name);
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}
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else {
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df = lookup(dot.TOK_IDF, CurrentScope);
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if (df && df->df_kind == D_PROCHEAD) {
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/* C_exp already generated when we saw the definition
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in the definition module
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*/
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df->df_kind = D_PROCEDURE;
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open_scope(OPENSCOPE);
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CurrentScope->sc_name = df->for_name;
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df->prc_vis = CurrVis;
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DefInFront(df);
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}
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else {
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df = define(dot.TOK_IDF, CurrentScope, type);
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open_scope(OPENSCOPE);
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df->prc_vis = CurrVis;
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sprint(buf,"_%d_%s",++nmcount,df->df_idf->id_text);
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CurrentScope->sc_name =
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Salloc(buf, (unsigned)(strlen(buf)+1));
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C_inp(buf);
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}
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}
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return df;
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}
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AddModule(id)
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struct idf *id;
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{
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/* Add the name of a module to the Module list. This list is
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maintained to create the initialization routine of the
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program/implementation module currently defined.
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*/
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static struct node *nd_end; /* to remember end of list */
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register struct node *n;
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extern struct node *Modules;
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n = MkLeaf(Name, &dot);
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n->nd_IDF = id;
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n->nd_symb = IDENT;
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if (nd_end) nd_end->next = n;
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else Modules = n;
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nd_end = n;
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}
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DefInFront(df)
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register struct def *df;
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{
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/* Put definition "df" in front of the list of definitions
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in its scope.
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This is neccessary because in some cases the order in this
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list is important.
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*/
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register struct def *df1 = df->df_scope->sc_def;
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if (df1 != df) {
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/* Definition "df" is not in front of the list
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*/
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while (df1 && df1->df_nextinscope != df) {
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/* Find definition "df"
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*/
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df1 = df1->df_nextinscope;
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}
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if (df1) {
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/* It already was in the list. Remove it
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*/
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df1->df_nextinscope = df->df_nextinscope;
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}
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/* Now put it in front
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*/
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df->df_nextinscope = df->df_scope->sc_def;
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df->df_scope->sc_def = df;
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}
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}
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struct def *
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DefineLocalModule(id)
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struct idf *id;
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{
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/* Create a definition for a local module. Also give it
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a name to be used for code generation.
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*/
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register struct def *df = define(id, CurrentScope, D_MODULE);
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register struct scope *sc;
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static int modulecount = 0;
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char buf[256];
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extern char *sprint();
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extern int proclevel;
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sprint(buf, "_%d%s", ++modulecount, id->id_text);
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if (!df->mod_vis) {
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/* We never saw the name of this module before. Create a
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scope for it.
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*/
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open_scope(CLOSEDSCOPE);
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df->mod_vis = CurrVis;
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}
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CurrVis = df->mod_vis;
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sc = CurrentScope;
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sc->sc_level = proclevel;
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sc->sc_definedby = df;
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sc->sc_name = Salloc(buf, (unsigned) (strlen(buf) + 1));
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/* Create a type for it
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*/
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df->df_type = standard_type(T_RECORD, 0, (arith) 0);
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df->df_type->rec_scope = sc;
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/* Generate code that indicates that the initialization procedure
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for this module is local.
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*/
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C_inp(buf);
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return df;
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}
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#ifdef DEBUG
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PrDef(df)
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register struct def *df;
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{
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print("n: %s, k: %d\n", df->df_idf->id_text, df->df_kind);
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}
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#endif DEBUG
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