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- #include "debug.h"
- #include <alloc.h>
- #include <assert.h>
- #include <em.h>
- #include "LLlex.h"
- #include "chk_expr.h"
- #include "def.h"
- #include "desig.h"
- #include "idf.h"
- #include "main.h"
- #include "node.h"
- #include "scope.h"
- #include "type.h"
- AssignStat(left, right)
- register struct node *left, *right;
- {
- register struct type *ltp, *rtp;
- struct desig dsr;
- if( !(ChkExpression(right) && ChkLhs(left)) )
- return;
- ltp = left->nd_type;
- rtp = right->nd_type;
- if( !TstAssCompat(ltp, rtp) ) {
- node_error(left, "type incompatibility in assignment");
- return;
- }
- if( rtp == emptyset_type )
- right->nd_type = ltp;
- if( !err_occurred ) {
- dsr = InitDesig;
- CodeExpr(right, &dsr, NO_LABEL);
- if( rtp->tp_fund & (T_ARRAY | T_RECORD) )
- CodeAddress(&dsr);
- else {
- CodeValue(&dsr, rtp);
- if( ltp == real_type && BaseType(rtp) == int_type )
- Int2Real();
- RangeCheck(ltp, rtp);
- }
- CodeMove(&dsr, left, rtp);
- }
- FreeNode(left);
- FreeNode(right);
- }
- ProcStat(nd)
- register struct node *nd;
- {
- if( !ChkCall(nd) ) return;
- if( nd->nd_type ) {
- node_error(nd, "procedure call expected");
- return;
- }
- }
- ChkForStat(nd)
- register struct node *nd;
- {
- register struct def *df;
- if( !(ChkVariable(nd) && ChkExpression(nd->nd_left) &&
- ChkExpression(nd->nd_right)) )
- return;
-
- assert(nd->nd_class == Def);
- df = nd->nd_def;
- if( df->df_scope != BlockScope ) {
- node_error(nd, "for loop: control variable must be local");
- return;
- }
- assert(df->df_kind == D_VARIABLE);
- if( df->df_scope != GlobalScope && df->var_off >= 0 ) {
- node_error(nd,"for loop: control variable can't be a parameter");
- return;
- }
- if( !(df->df_type->tp_fund & T_ORDINAL) ) {
- node_error(nd, "for loop: control variable must be ordinal");
- return;
- }
- if( !TstCompat(df->df_type, nd->nd_left->nd_type) )
- node_error(nd,
- "for loop: initial value incompatible with control variable");
- if( !TstCompat(df->df_type, nd->nd_right->nd_type) )
- node_error(nd,
- "for loop: final value incompatible with control variable");
-
- df->df_flags |= D_LOOPVAR;
- return;
- }
- arith
- CodeInitFor(nd, priority)
- register struct node *nd;
- {
- /* Push init-value or final-value, the value may only be evaluated
- once, so generate a temporary for it, when not a constant.
- */
- arith tmp;
- CodePExpr(nd);
- if( nd->nd_class != Value ) {
- tmp = NewInt(priority);
- C_dup(int_size);
- C_stl(tmp);
- return tmp;
- }
- return (arith) 0;
- }
- CodeFor(nd, stepsize, l1, l2, tmp1)
- struct node *nd;
- label l1, l2;
- arith tmp1;
- {
- /* Test if loop has to be done */
- if( stepsize == 1 ) /* TO */
- C_bgt(l2);
- else /* DOWNTO */
- C_blt(l2);
- /* Store init-value in control-variable */
- if( tmp1 )
- C_lol(tmp1);
- else
- CodePExpr(nd->nd_left);
- /* Label at begin of the body */
- C_df_ilb(l1);
- RangeCheck(nd->nd_type, nd->nd_left->nd_type);
- CodeDStore(nd);
- }
- CodeEndFor(nd, stepsize, l1, l2, tmp2)
- struct node *nd;
- label l1, l2;
- arith tmp2;
- {
- /* Test if loop has to be done once more */
- CodePExpr(nd);
- C_dup(int_size);
- if( tmp2 )
- C_lol(tmp2);
- else
- CodePExpr(nd->nd_right);
- C_beq(l2);
- /* Increment/decrement the control-variable */
- if( stepsize == 1 ) /* TO */
- C_inc();
- else /* DOWNTO */
- C_dec();
- C_bra(l1);
- /* Exit label */
- C_df_ilb(l2);
- }
- WithStat(nd)
- struct node *nd;
- {
- struct withdesig *wds;
- struct desig ds;
- struct scopelist *scl;
- if( nd->nd_type->tp_fund != T_RECORD ) {
- node_error(nd, "record variable expected");
- return;
- }
- if( err_occurred ) return;
- /* Generate code */
- CodeDAddress(nd);
- wds = new_withdesig();
- wds->w_next = WithDesigs;
- WithDesigs = wds;
- wds->w_scope = nd->nd_type->rec_scope;
- /* create a desig structure for the temporary */
- ds.dsg_kind = DSG_FIXED;
- ds.dsg_offset = NewPtr(1);
- ds.dsg_name = 0;
- /* need some pointertype to store pointer */
- CodeStore(&ds, nil_type);
- /* record is indirectly available */
- ds.dsg_kind = DSG_PFIXED;
- wds->w_desig = ds;
- scl = new_scopelist();
- scl->sc_scope = wds->w_scope;
- scl->next = CurrVis;
- CurrVis = scl;
- }
- EndWith(saved_scl, nd)
- struct scopelist *saved_scl;
- struct node *nd;
- {
- /* restore scope, and release structures */
- struct scopelist *scl;
- struct withdesig *wds;
- while( CurrVis != saved_scl ) {
- /* release scopelist */
- scl = CurrVis;
- CurrVis = CurrVis->next;
- free_scopelist(scl);
- /* release temporary */
- FreePtr(WithDesigs->w_desig.dsg_offset);
- /* release withdesig */
- wds = WithDesigs;
- WithDesigs = WithDesigs->w_next;
- free_withdesig(wds);
- }
- FreeNode(nd);
- }
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