373 lines
7.3 KiB
C
373 lines
7.3 KiB
C
#include "debug.h"
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#include <alloc.h>
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#include <assert.h>
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#include <em.h>
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#include "LLlex.h"
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#include "chk_expr.h"
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#include "def.h"
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#include "desig.h"
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#include "idf.h"
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#include "main.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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MarkDef(nd, flags, on)
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register struct node *nd;
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unsigned short flags;
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{
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while( nd && nd->nd_class != Def ) {
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if( (nd->nd_class == Arrsel) ||
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(nd->nd_class == LinkDef) )
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nd = nd->nd_left;
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else if( nd->nd_class == Arrow )
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nd = nd->nd_right;
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else break;
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}
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if( nd && (nd->nd_class == Def) ) {
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if( (flags & D_SET) && on &&
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BlockScope != nd->nd_def->df_scope )
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nd->nd_def->df_flags |= D_SETINHIGH;
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if( on ) {
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if( (flags & D_SET) &&
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(nd->nd_def->df_flags & D_WITH) )
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node_warning(nd,
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"variable \"%s\" already referenced in with",
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nd->nd_def->df_idf->id_text);
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nd->nd_def->df_flags |= flags;
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}
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else
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nd->nd_def->df_flags &= ~flags;
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}
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}
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AssertStat(expp, line)
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register struct node *expp;
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unsigned short line;
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{
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struct desig dsr;
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if( !ChkExpression(expp) )
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return;
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if( expp->nd_type != bool_type ) {
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node_error(expp, "type of assertion should be boolean");
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return;
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}
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if( !options['a'] && !err_occurred ) {
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dsr = InitDesig;
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CodeExpr(expp, &dsr, NO_LABEL);
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C_loc((arith)line);
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C_cal("_ass");
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}
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}
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AssignStat(left, right)
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register struct node *left, *right;
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{
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register struct type *ltp, *rtp;
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int retval = 0;
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struct desig dsr;
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retval = ChkExpression(right);
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MarkUsed(right);
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retval &= ChkLhs(left);
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ltp = left->nd_type;
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rtp = right->nd_type;
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MarkDef(left, (unsigned short)D_SET, 1);
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if( !retval ) return;
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if( ltp == int_type && rtp == long_type ) {
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right = MkNode(IntReduc, NULLNODE, right, &dot);
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right->nd_type = int_type;
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}
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else if( ltp == long_type && rtp == int_type ) {
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right = MkNode(IntCoerc, NULLNODE, right, &dot);
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right->nd_type = long_type;
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}
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if( !TstAssCompat(ltp, rtp) ) {
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node_error(left, "type incompatibility in assignment");
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return;
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}
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if( left->nd_class == Def &&
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(left->nd_def->df_flags & D_INLOOP) ) {
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node_error(left, "assignment to a control variable");
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return;
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}
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if( rtp == emptyset_type )
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right->nd_type = ltp;
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if( !err_occurred ) {
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dsr = InitDesig;
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CodeExpr(right, &dsr, NO_LABEL);
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if( rtp->tp_fund & (T_ARRAY | T_RECORD) )
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CodeAddress(&dsr);
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else {
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CodeValue(&dsr, rtp);
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if( ltp == real_type && BaseType(rtp) == int_type )
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Int2Real(rtp->tp_size);
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RangeCheck(ltp, rtp);
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}
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CodeMove(&dsr, left, rtp);
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}
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FreeNode(left);
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FreeNode(right);
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}
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ProcStat(nd)
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register struct node *nd;
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{
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if( !ChkCall(nd) ) return;
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if( nd->nd_type ) {
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node_error(nd, "procedure call expected");
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return;
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}
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}
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ChkForStat(nd)
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register struct node *nd;
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{
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register struct def *df;
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int retvar = 0;
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retvar = ChkVariable(nd);
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retvar &= ChkExpression(nd->nd_left);
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MarkUsed(nd->nd_left);
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retvar &= ChkExpression(nd->nd_right);
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MarkUsed(nd->nd_right);
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if( !retvar ) return;
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assert(nd->nd_class == Def);
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df = nd->nd_def;
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if( df->df_scope != BlockScope ) {
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node_error(nd, "for loop: control variable must be local");
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return;
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}
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assert(df->df_kind == D_VARIABLE);
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if( df->df_scope != GlobalScope && df->var_off >= 0 ) {
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node_error(nd,
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"for loop: control variable can't be a parameter");
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MarkDef(nd,(unsigned short)(D_LOOPVAR | D_SET | D_USED), 1);
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return;
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}
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if( !(df->df_type->tp_fund & T_ORDINAL) ) {
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node_error(nd, "for loop: control variable must be ordinal");
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MarkDef(nd,(unsigned short)(D_LOOPVAR | D_SET | D_USED), 1);
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return;
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}
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if( !TstCompat(df->df_type, nd->nd_left->nd_type) )
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node_error(nd,
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"for loop: initial value incompatible with control variable");
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if( !TstCompat(df->df_type, nd->nd_right->nd_type) )
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node_error(nd,
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"for loop: final value incompatible with control variable");
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if( df->df_type == long_type )
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node_error(nd, "for loop: control variable can not be a long");
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if( df->df_flags & D_INLOOP )
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node_error(nd, "for loop: control variable already used");
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if( df->df_flags & D_SETINHIGH )
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node_error(nd,
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"for loop: control variable already set in block");
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MarkDef(nd,(unsigned short) (D_LOOPVAR | D_INLOOP | D_SET | D_USED), 1);
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return;
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}
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EndForStat(nd)
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register struct node *nd;
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{
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register struct def *df;
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df = nd->nd_def;
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if( (df->df_scope != BlockScope) ||
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(df->df_scope != GlobalScope && df->var_off >= 0) ||
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!(df->df_type->tp_fund & T_ORDINAL)
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)
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return;
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MarkDef(nd,(unsigned short) (D_INLOOP | D_SET), 0);
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}
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arith
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CodeInitFor(nd, priority)
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register struct node *nd;
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{
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/* Push init-value or final-value, the value may only be evaluated
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once, so generate a temporary for it, when not a constant.
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*/
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arith tmp;
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CodePExpr(nd);
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if( nd->nd_class != Value ) {
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tmp = NewInt(priority);
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C_dup(int_size);
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C_stl(tmp);
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return tmp;
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}
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return (arith) 0;
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}
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CodeFor(nd, stepsize, l1, l2, tmp1)
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struct node *nd;
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label l1, l2;
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arith tmp1;
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{
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/* Test if loop has to be done */
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if( stepsize == 1 ) /* TO */
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C_bgt(l2);
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else /* DOWNTO */
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C_blt(l2);
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/* Store init-value in control-variable */
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if( tmp1 )
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C_lol(tmp1);
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else
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CodePExpr(nd->nd_left);
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/* Label at begin of the body */
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C_df_ilb(l1);
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RangeCheck(nd->nd_type, nd->nd_left->nd_type);
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CodeDStore(nd);
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}
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CodeEndFor(nd, stepsize, l1, l2, tmp2)
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struct node *nd;
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label l1, l2;
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arith tmp2;
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{
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/* Test if loop has to be done once more */
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CodePExpr(nd);
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C_dup(int_size);
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if( tmp2 )
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C_lol(tmp2);
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else
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CodePExpr(nd->nd_right);
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C_beq(l2);
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/* Increment/decrement the control-variable */
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if( stepsize == 1 ) /* TO */
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C_inc();
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else /* DOWNTO */
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C_dec();
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C_bra(l1);
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/* Exit label */
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C_df_ilb(l2);
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C_asp(int_size);
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}
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WithStat(nd)
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struct node *nd;
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{
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struct withdesig *wds;
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struct desig ds;
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struct scopelist *scl;
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if( nd->nd_type->tp_fund != T_RECORD ) {
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node_error(nd, "record variable expected");
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return;
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}
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MarkDef(nd, (unsigned short)(D_USED | D_SET | D_WITH), 1);
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/*
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if( (nd->nd_class == Arrow) &&
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(nd->nd_right->nd_type->tp_fund & T_FILE) ) {
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nd->nd_right->nd_def->df_flags |= D_WITH;
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}
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*/
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scl = new_scopelist();
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scl->sc_scope = nd->nd_type->rec_scope;
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scl->next = CurrVis;
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CurrVis = scl;
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if( err_occurred ) return;
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/* Generate code */
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CodeDAddress(nd);
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wds = new_withdesig();
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wds->w_next = WithDesigs;
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WithDesigs = wds;
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wds->w_scope = scl->sc_scope;
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/* create a desig structure for the temporary */
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ds.dsg_kind = DSG_FIXED;
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ds.dsg_offset = NewPtr(1);
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ds.dsg_name = 0;
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/* need some pointertype to store pointer */
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CodeStore(&ds, nil_type);
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/* record is indirectly available */
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ds.dsg_kind = DSG_PFIXED;
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wds->w_desig = ds;
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}
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EndWith(saved_scl, nd)
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struct scopelist *saved_scl;
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struct node *nd;
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{
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/* restore scope, and release structures */
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struct scopelist *scl;
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struct withdesig *wds;
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struct node *nd1;
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while( CurrVis != saved_scl ) {
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/* release scopelist */
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scl = CurrVis;
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CurrVis = CurrVis->next;
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free_scopelist(scl);
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if( WithDesigs == 0 )
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continue; /* we didn't generate any code */
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/* release temporary */
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FreePtr(WithDesigs->w_desig.dsg_offset);
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/* release withdesig */
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wds = WithDesigs;
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WithDesigs = WithDesigs->w_next;
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free_withdesig(wds);
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}
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for( nd1 = nd; nd1 != NULLNODE; nd1 = nd1->nd_right ) {
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MarkDef(nd1->nd_left, (unsigned short)(D_WITH), 0);
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}
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FreeNode(nd);
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}
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