65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/* L O O K U P R O U T I N E S */
|
|
|
|
#include <em_arith.h>
|
|
#include <em_label.h>
|
|
|
|
#include "LLlex.h"
|
|
#include "def.h"
|
|
#include "idf.h"
|
|
#include "misc.h"
|
|
#include "node.h"
|
|
#include "scope.h"
|
|
#include "type.h"
|
|
|
|
struct def *
|
|
lookup(id, scope)
|
|
register struct idf *id;
|
|
struct scope *scope;
|
|
{
|
|
/* Look up a definition of an identifier in scope "scope".
|
|
Make the "def" list self-organizing.
|
|
Return a pointer to its "def" structure if it exists,
|
|
otherwise return 0.
|
|
*/
|
|
register struct def *df, *df1;
|
|
|
|
/* Look in the chain of definitions of this "id" for one with scope
|
|
"scope".
|
|
*/
|
|
for( df = id->id_def, df1 = 0;
|
|
df && df->df_scope != scope;
|
|
df1 = df, df = df->df_next ) { /* nothing */ }
|
|
|
|
if( df && df1 ) {
|
|
/* Put the definition in front
|
|
*/
|
|
df1->df_next = df->df_next;
|
|
df->df_next = id->id_def;
|
|
id->id_def = df;
|
|
}
|
|
return df;
|
|
}
|
|
|
|
struct def *
|
|
lookfor(id, vis, give_error)
|
|
register struct node *id;
|
|
struct scopelist *vis;
|
|
{
|
|
/* Look for an identifier in the visibility range started by "vis".
|
|
If it is not defined create a dummy definition and
|
|
if give_error is set, give an error message.
|
|
*/
|
|
register struct def *df;
|
|
register struct scopelist *sc = vis;
|
|
|
|
while( sc ) {
|
|
df = lookup(id->nd_IDF, sc->sc_scope);
|
|
if( df ) return df;
|
|
sc = nextvisible(sc);
|
|
}
|
|
|
|
if( give_error ) id_not_declared(id);
|
|
|
|
df = MkDef(id->nd_IDF, vis->sc_scope, D_ERROR);
|
|
return df;
|
|
}
|