115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
/* S C O P E M E C H A N I S M */
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#include "debug.h"
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#include <alloc.h>
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#include <assert.h>
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#include <em_arith.h>
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#include <em_label.h>
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#include "LLlex.h"
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#include "def.h"
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#include "idf.h"
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#include "misc.h"
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#include "node.h"
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#include "scope.h"
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#include "type.h"
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struct scope *GlobalScope, *PervasiveScope, *BlockScope;
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struct scopelist *CurrVis;
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extern int proclevel; /* declared in declar.g */
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static int sccount;
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InitScope()
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{
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register struct scope *sc = new_scope();
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register struct scopelist *ls = new_scopelist();
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sc->sc_def = 0;
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sc->sc_level = proclevel;
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PervasiveScope = sc;
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ls->next = 0;
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ls->sc_scope = PervasiveScope;
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ls->sc_count = ++sccount;
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CurrVis = ls;
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}
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open_scope()
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{
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register struct scope *sc = new_scope();
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register struct scopelist *ls = new_scopelist();
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sc->sc_level = proclevel;
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ls->sc_scope = sc;
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ls->next = CurrVis;
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ls->sc_count = ++sccount;
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CurrVis = ls;
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}
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close_scope()
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{
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/* When this procedure is called, the next visible scope is equal to
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the statically enclosing scope
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*/
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assert(CurrentScope != 0);
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CurrVis = CurrVis->next;
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}
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Forward(nd, tp)
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register struct node *nd;
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register struct type *tp;
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{
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/* Enter a forward reference into the current scope. This is
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* used in pointertypes.
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*/
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register struct def *df = define(nd->nd_IDF, CurrentScope, D_FORWTYPE);
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register struct forwtype *fw_type = new_forwtype();
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fw_type->f_next = df->df_fortype;
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df->df_fortype = fw_type;
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fw_type->f_node = nd;
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fw_type->f_type = tp;
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}
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STATIC
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chk_prog_params()
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{
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/* the program parameters must be global variables of some file type */
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register struct def *df = CurrentScope->sc_def;
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while( df ) {
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if( df->df_kind & D_PARAMETER ) {
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if( !is_anon_idf(df->df_idf) ) {
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if( df->df_type == error_type )
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error("program parameter \"%s\" must be a global variable",
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df->df_idf->id_text);
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else if( df->df_type->tp_fund != T_FILE )
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error("program parameter \"%s\" must have a file type",
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df->df_idf->id_text);
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df->df_kind = D_VARIABLE;
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}
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else df->df_kind = D_ERROR;
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}
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df = df->df_nextinscope;
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}
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}
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STATIC
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chk_directives()
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{
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/* check if all forward declarations are defined */
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register struct def *df = CurrentScope->sc_def;
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while( df ) {
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if( df->df_kind == D_FWPROCEDURE )
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error("procedure \"%s\" not defined", df->df_idf->id_text);
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else if( df->df_kind == D_FWFUNCTION )
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error("function \"%s\" not defined", df->df_idf->id_text);
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df = df->df_nextinscope;
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}
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}
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