1010 lines
18 KiB
C
1010 lines
18 KiB
C
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*
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* Author: Ceriel J.H. Jacobs
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*/
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/* C O D E G E N E R A T I O N R O U T I N E S */
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/* $Header$ */
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/* Code generation for expressions and coercions
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*/
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#include "debug.h"
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#include <em_arith.h>
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#include <em_label.h>
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#include <em_code.h>
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#include <assert.h>
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#include "type.h"
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#include "def.h"
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#include "scope.h"
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#include "desig.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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#include "standards.h"
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#include "walk.h"
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extern char *long2str();
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extern char *symbol2str();
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extern int proclevel;
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int fp_used;
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CodeConst(cst, size)
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arith cst, size;
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{
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/* Generate code to push constant "cst" with size "size"
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*/
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if (size <= word_size) {
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C_loc(cst);
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}
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else if (size == dword_size) {
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C_ldc(cst);
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}
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else {
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crash("(CodeConst)");
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/*
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C_df_dlb(++data_label);
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C_rom_icon(long2str((long) cst), size);
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C_lae_dlb(data_label, (arith) 0);
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C_loi(size);
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*/
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}
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}
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CodeString(nd)
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register struct node *nd;
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{
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if (nd->nd_type->tp_fund != T_STRING) {
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/* Character constant */
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C_loc(nd->nd_INT);
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}
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else {
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C_df_dlb(++data_label);
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C_rom_scon(nd->nd_STR, WA(nd->nd_SLE + 1));
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C_lae_dlb(data_label, (arith) 0);
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}
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}
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CodeExpr(nd, ds, true_label, false_label)
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register struct node *nd;
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register struct desig *ds;
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label true_label, false_label;
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{
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register struct type *tp = nd->nd_type;
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if (tp->tp_fund == T_REAL) fp_used = 1;
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switch(nd->nd_class) {
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case Def:
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if (nd->nd_def->df_kind & (D_PROCEDURE|D_PROCHEAD)) {
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C_lpi(NameOfProc(nd->nd_def));
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ds->dsg_kind = DSG_LOADED;
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break;
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}
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/* Fall through */
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case Link:
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case LinkDef:
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case Arrsel:
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case Arrow:
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CodeDesig(nd, ds);
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break;
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case Oper:
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CodeOper(nd, true_label, false_label);
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ds->dsg_kind = DSG_LOADED;
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true_label = NO_LABEL;
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break;
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case Uoper:
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CodeUoper(nd);
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ds->dsg_kind = DSG_LOADED;
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break;
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case Value:
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switch(nd->nd_symb) {
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case REAL:
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C_df_dlb(++data_label);
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C_rom_fcon(nd->nd_REL, nd->nd_type->tp_size);
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C_lae_dlb(data_label, (arith) 0);
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C_loi(nd->nd_type->tp_size);
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break;
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case STRING:
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CodeString(nd);
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break;
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case INTEGER:
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CodeConst(nd->nd_INT, tp->tp_size);
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break;
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default:
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crash("Value error");
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}
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ds->dsg_kind = DSG_LOADED;
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break;
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case Call:
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CodeCall(nd);
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ds->dsg_kind = DSG_LOADED;
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break;
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case Xset:
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case Set: {
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register int i = tp->tp_size / word_size;
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register arith *st = nd->nd_set + i;
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ds->dsg_kind = DSG_LOADED;
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for (; i > 0; i--) {
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C_loc(*--st);
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}
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CodeSet(nd);
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}
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break;
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default:
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crash("(CodeExpr) bad node type");
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}
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if (true_label != NO_LABEL) {
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/* Only for boolean expressions
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*/
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CodeValue(ds, tp->tp_size, tp->tp_align);
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C_zne(true_label);
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C_bra(false_label);
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}
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}
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CodeCoercion(t1, t2)
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register struct type *t1, *t2;
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{
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register int fund1, fund2;
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t1 = BaseType(t1);
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t2 = BaseType(t2);
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if (t1 == t2) return;
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if ((fund1 = t1->tp_fund) == T_WORD) fund1 = T_INTEGER;
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if ((fund2 = t2->tp_fund) == T_WORD) fund2 = T_INTEGER;
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switch(fund1) {
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case T_INTEGER:
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switch(fund2) {
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case T_INTEGER:
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if (t2->tp_size != t1->tp_size) {
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C_loc(t1->tp_size);
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C_loc(t2->tp_size);
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C_cii();
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}
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break;
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case T_ENUMERATION:
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case T_CHAR:
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case T_CARDINAL:
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if (t1->tp_size != word_size) {
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C_loc(t1->tp_size);
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C_loc(word_size);
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C_ciu();
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}
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break;
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case T_REAL:
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C_loc(t1->tp_size);
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C_loc(t2->tp_size);
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C_cif();
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break;
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default:
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crash("Funny integer conversion");
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}
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break;
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case T_CHAR:
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case T_ENUMERATION:
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case T_CARDINAL:
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case T_INTORCARD:
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switch(fund2) {
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case T_ENUMERATION:
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case T_CHAR:
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case T_CARDINAL:
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case T_POINTER:
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case T_EQUAL:
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case T_INTORCARD:
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if (t2->tp_size > word_size) {
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C_loc(word_size);
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C_loc(t2->tp_size);
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C_cuu();
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}
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break;
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case T_INTEGER:
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C_loc(word_size);
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C_loc(t2->tp_size);
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C_cui();
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break;
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case T_REAL:
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C_loc(word_size);
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C_loc(t2->tp_size);
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C_cuf();
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break;
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default:
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crash("Funny cardinal conversion");
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}
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break;
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case T_REAL:
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switch(fund2) {
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case T_REAL:
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if (t2->tp_size != t1->tp_size) {
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C_loc(t1->tp_size);
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C_loc(t2->tp_size);
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C_cff();
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}
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break;
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case T_INTEGER:
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C_loc(t1->tp_size);
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C_loc(t2->tp_size);
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C_cfi();
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break;
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case T_CARDINAL:
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C_loc(t1->tp_size);
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C_loc(t2->tp_size);
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C_cfu();
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break;
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default:
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crash("Funny REAL conversion");
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}
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break;
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}
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}
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CodeCall(nd)
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register struct node *nd;
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{
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/* Generate code for a procedure call. Checking of parameters
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and result is already done.
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*/
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register struct node *left = nd->nd_left;
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register struct node *right = nd->nd_right;
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register struct type *result_tp;
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if (left->nd_type == std_type) {
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CodeStd(nd);
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return;
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}
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if (IsCast(left)) {
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/* it was just a cast. Simply ignore it
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*/
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CodePExpr(right->nd_left);
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*nd = *(right->nd_left);
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nd->nd_type = left->nd_def->df_type;
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return;
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}
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assert(IsProcCall(left));
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if (right) {
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CodeParameters(ParamList(left->nd_type), right);
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}
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switch(left->nd_class) {
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case Def: {
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register struct def *df = left->nd_def;
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if (df->df_kind == D_PROCEDURE) {
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int level = df->df_scope->sc_level;
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if (level > 0) {
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C_lxl((arith) (proclevel - level));
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}
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C_cal(NameOfProc(df));
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break;
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}
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else if (df->df_kind == D_PROCHEAD) {
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C_cal(df->for_name);
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break;
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}}
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/* Fall through */
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default:
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CodePExpr(left);
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C_cai();
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}
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C_asp(left->nd_type->prc_nbpar);
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if (result_tp = ResultType(left->nd_type)) {
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if (IsConstructed(result_tp)) {
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C_lfr(pointer_size);
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C_loi(result_tp->tp_size);
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}
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else C_lfr(WA(result_tp->tp_size));
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}
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}
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CodeParameters(param, arg)
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struct paramlist *param;
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struct node *arg;
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{
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register struct type *tp;
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register struct node *left;
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register struct type *left_type;
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assert(param != 0 && arg != 0);
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if (param->next) {
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CodeParameters(param->next, arg->nd_right);
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}
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tp = TypeOfParam(param);
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left = arg->nd_left;
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left_type = left->nd_type;
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if (IsConformantArray(tp)) {
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register struct type *elem = tp->arr_elem;
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C_loc(tp->arr_elsize);
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if (IsConformantArray(left_type)) {
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DoHIGH(left->nd_def);
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if (elem->tp_size != left_type->arr_elem->tp_size) {
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/* This can only happen if the formal type is
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ARRAY OF (WORD|BYTE)
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*/
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C_loc(left_type->arr_elem->tp_size);
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C_mli(word_size);
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if (elem == word_type) {
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C_loc(word_size - 1);
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C_adi(word_size);
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C_loc(word_size);
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C_dvi(word_size);
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}
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else {
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assert(elem == byte_type);
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}
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}
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}
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else if (left->nd_symb == STRING) {
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C_loc(left->nd_SLE - 1);
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}
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else if (elem == word_type) {
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C_loc((left_type->tp_size+word_size-1) / word_size - 1);
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}
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else if (elem == byte_type) {
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C_loc(left_type->tp_size - 1);
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}
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else {
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arith lb, ub;
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getbounds(IndexType(left_type), &lb, &ub);
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C_loc(ub - lb);
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}
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C_loc((arith) 0);
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if (left->nd_symb == STRING) {
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CodeString(left);
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}
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else if (left->nd_class == Call) {
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/* ouch! forgot about this one! */
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arith tmp, TmpSpace();
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CodePExpr(left);
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tmp = TmpSpace(left->nd_type->tp_size, left->nd_type->tp_align);
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C_lal(tmp);
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C_sti(WA(left->nd_type->tp_size));
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C_lal(tmp);
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}
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else CodeDAddress(left);
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return;
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}
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if (IsVarParam(param)) {
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CodeDAddress(left);
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return;
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}
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if (left_type->tp_fund == T_STRING) {
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CodePString(left, tp);
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return;
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}
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CodePExpr(left);
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RangeCheck(tp, left_type);
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CodeCoercion(left_type, tp);
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}
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CodePString(nd, tp)
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struct node *nd;
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struct type *tp;
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{
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arith szarg = WA(nd->nd_type->tp_size);
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register arith zersz = WA(tp->tp_size) - szarg;
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if (zersz) {
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/* null padding required */
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assert(zersz > 0);
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C_zer(zersz);
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}
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CodeString(nd); /* push address of string */
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C_loi(szarg);
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}
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CodeStd(nd)
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struct node *nd;
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{
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register struct node *arg = nd->nd_right;
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register struct node *left = 0;
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register struct type *tp;
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int std = nd->nd_left->nd_def->df_value.df_stdname;
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if (arg) {
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left = arg->nd_left;
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tp = BaseType(left->nd_type);
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arg = arg->nd_right;
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}
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switch(std) {
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case S_ABS:
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CodePExpr(left);
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if (tp->tp_fund == T_INTEGER) {
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if (tp->tp_size == int_size) C_cal("_absi");
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else C_cal("_absl");
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}
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else if (tp->tp_fund == T_REAL) {
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if (tp->tp_size == float_size) C_cal("_absf");
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else C_cal("_absd");
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}
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C_asp(tp->tp_size);
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C_lfr(tp->tp_size);
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break;
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case S_CAP:
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CodePExpr(left);
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C_loc((arith) 0137); /* ASCII assumed */
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C_and(word_size);
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break;
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case S_CHR:
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CodePExpr(left);
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RangeCheck(char_type, tp);
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break;
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case S_HIGH:
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assert(IsConformantArray(tp));
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DoHIGH(left->nd_def);
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break;
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case S_SIZE:
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case S_TSIZE:
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assert(IsConformantArray(tp));
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DoHIGH(left->nd_def);
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C_inc();
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C_loc(tp->arr_elem->tp_size);
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C_mlu(word_size);
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break;
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case S_ODD:
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CodePExpr(left);
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if (tp->tp_size == word_size) {
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C_loc((arith) 1);
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C_and(word_size);
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}
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else {
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assert(tp->tp_size == dword_size);
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C_ldc((arith) 1);
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C_and(dword_size);
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C_ior(word_size);
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}
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break;
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case S_ORD:
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CodePExpr(left);
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break;
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case S_TRUNCD:
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case S_TRUNC:
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case S_FLOAT:
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case S_FLOATD:
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case S_LONG:
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case S_SHORT:
|
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CodePExpr(left);
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CodeCoercion(tp, nd->nd_type);
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break;
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case S_VAL:
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CodePExpr(left);
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RangeCheck(nd->nd_type, tp);
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break;
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case S_ADR:
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CodeDAddress(left);
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break;
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case S_DEC:
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case S_INC: {
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register arith size = tp->tp_size;
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if (size < word_size) size = word_size;
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CodePExpr(left);
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if (arg) CodePExpr(arg->nd_left);
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else C_loc((arith) 1);
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if (std == S_DEC) {
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if (tp->tp_fund == T_INTEGER) C_sbi(size);
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else C_sbu(size);
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}
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else {
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if (tp->tp_fund == T_INTEGER) C_adi(size);
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else C_adu(size);
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}
|
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if (size == word_size) RangeCheck(tp, int_type);
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CodeDStore(left);
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break;
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}
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|
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case S_HALT:
|
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C_cal("_halt");
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break;
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case S_INCL:
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case S_EXCL:
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CodePExpr(left);
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CodePExpr(arg->nd_left);
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C_set(tp->tp_size);
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if (std == S_INCL) {
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C_ior(tp->tp_size);
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}
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else {
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C_com(tp->tp_size);
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C_and(tp->tp_size);
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}
|
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CodeDStore(left);
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break;
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|
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default:
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crash("(CodeStd)");
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}
|
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}
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|
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RangeCheck(tpl, tpr)
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register struct type *tpl, *tpr;
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{
|
|
/* Generate a range check if neccessary
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*/
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arith llo, lhi, rlo, rhi;
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|
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if (bounded(tpl)) {
|
|
/* in this case we might need a range check */
|
|
if (!bounded(tpr)) {
|
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/* yes, we need one */
|
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genrck(tpl);
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}
|
|
else {
|
|
/* both types are restricted. check the bounds
|
|
to see wether we need a range check.
|
|
We don't need one if the range of values of the
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|
right hand side is a subset of the range of values
|
|
of the left hand side.
|
|
*/
|
|
getbounds(tpl, &llo, &lhi);
|
|
getbounds(tpr, &rlo, &rhi);
|
|
if (llo > rlo || lhi < rhi) {
|
|
genrck(tpl);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
Operands(leftop, rightop, tp)
|
|
register struct node *leftop, *rightop;
|
|
struct type *tp;
|
|
{
|
|
|
|
CodePExpr(leftop);
|
|
CodeCoercion(leftop->nd_type, tp);
|
|
CodePExpr(rightop);
|
|
CodeCoercion(rightop->nd_type, tp);
|
|
}
|
|
|
|
CodeOper(expr, true_label, false_label)
|
|
register struct node *expr; /* the expression tree itself */
|
|
label true_label;
|
|
label false_label; /* labels to jump to in logical expr's */
|
|
{
|
|
register struct node *leftop = expr->nd_left;
|
|
register struct node *rightop = expr->nd_right;
|
|
register struct type *tp = expr->nd_type;
|
|
|
|
switch (expr->nd_symb) {
|
|
case '+':
|
|
Operands(leftop, rightop, tp);
|
|
switch (tp->tp_fund) {
|
|
case T_INTEGER:
|
|
C_adi(tp->tp_size);
|
|
break;
|
|
case T_REAL:
|
|
C_adf(tp->tp_size);
|
|
break;
|
|
case T_POINTER:
|
|
case T_EQUAL:
|
|
case T_CARDINAL:
|
|
case T_INTORCARD:
|
|
C_adu(tp->tp_size);
|
|
break;
|
|
case T_SET:
|
|
C_ior(tp->tp_size);
|
|
break;
|
|
default:
|
|
crash("bad type +");
|
|
}
|
|
break;
|
|
case '-':
|
|
Operands(leftop, rightop, tp);
|
|
switch (tp->tp_fund) {
|
|
case T_INTEGER:
|
|
C_sbi(tp->tp_size);
|
|
break;
|
|
case T_REAL:
|
|
C_sbf(tp->tp_size);
|
|
break;
|
|
case T_POINTER:
|
|
case T_EQUAL:
|
|
case T_CARDINAL:
|
|
case T_INTORCARD:
|
|
C_sbu(tp->tp_size);
|
|
break;
|
|
case T_SET:
|
|
C_com(tp->tp_size);
|
|
C_and(tp->tp_size);
|
|
break;
|
|
default:
|
|
crash("bad type -");
|
|
}
|
|
break;
|
|
case '*':
|
|
Operands(leftop, rightop, tp);
|
|
switch (tp->tp_fund) {
|
|
case T_INTEGER:
|
|
C_mli(tp->tp_size);
|
|
break;
|
|
case T_POINTER:
|
|
case T_EQUAL:
|
|
case T_CARDINAL:
|
|
case T_INTORCARD:
|
|
C_mlu(tp->tp_size);
|
|
break;
|
|
case T_REAL:
|
|
C_mlf(tp->tp_size);
|
|
break;
|
|
case T_SET:
|
|
C_and(tp->tp_size);
|
|
break;
|
|
default:
|
|
crash("bad type *");
|
|
}
|
|
break;
|
|
case '/':
|
|
Operands(leftop, rightop, tp);
|
|
switch (tp->tp_fund) {
|
|
case T_REAL:
|
|
C_dvf(tp->tp_size);
|
|
break;
|
|
case T_SET:
|
|
C_xor(tp->tp_size);
|
|
break;
|
|
default:
|
|
crash("bad type /");
|
|
}
|
|
break;
|
|
case DIV:
|
|
Operands(leftop, rightop, tp);
|
|
switch(tp->tp_fund) {
|
|
case T_INTEGER:
|
|
C_dvi(tp->tp_size);
|
|
break;
|
|
case T_POINTER:
|
|
case T_EQUAL:
|
|
case T_CARDINAL:
|
|
case T_INTORCARD:
|
|
C_dvu(tp->tp_size);
|
|
break;
|
|
default:
|
|
crash("bad type DIV");
|
|
}
|
|
break;
|
|
case MOD:
|
|
Operands(leftop, rightop, tp);
|
|
switch(tp->tp_fund) {
|
|
case T_INTEGER:
|
|
C_rmi(tp->tp_size);
|
|
break;
|
|
case T_POINTER:
|
|
case T_EQUAL:
|
|
case T_CARDINAL:
|
|
case T_INTORCARD:
|
|
C_rmu(tp->tp_size);
|
|
break;
|
|
default:
|
|
crash("bad type MOD");
|
|
}
|
|
break;
|
|
case '<':
|
|
case LESSEQUAL:
|
|
case '>':
|
|
case GREATEREQUAL:
|
|
case '=':
|
|
case '#':
|
|
tp = BaseType(leftop->nd_type);
|
|
if (tp == intorcard_type) tp = BaseType(rightop->nd_type);
|
|
Operands(leftop, rightop, tp);
|
|
switch (tp->tp_fund) {
|
|
case T_INTEGER:
|
|
C_cmi(tp->tp_size);
|
|
break;
|
|
case T_POINTER:
|
|
case T_HIDDEN:
|
|
case T_EQUAL:
|
|
case T_CARDINAL:
|
|
case T_INTORCARD:
|
|
C_cmu(tp->tp_size);
|
|
break;
|
|
case T_ENUMERATION:
|
|
case T_CHAR:
|
|
C_cmu(word_size);
|
|
break;
|
|
case T_REAL:
|
|
C_cmf(tp->tp_size);
|
|
break;
|
|
case T_SET:
|
|
if (expr->nd_symb == GREATEREQUAL) {
|
|
/* A >= B is the same as A equals A + B
|
|
*/
|
|
C_dup(2*tp->tp_size);
|
|
C_asp(tp->tp_size);
|
|
C_ior(tp->tp_size);
|
|
}
|
|
else if (expr->nd_symb == LESSEQUAL) {
|
|
/* A <= B is the same as A - B = {}
|
|
*/
|
|
C_com(tp->tp_size);
|
|
C_and(tp->tp_size);
|
|
C_zer(tp->tp_size);
|
|
}
|
|
C_cms(tp->tp_size);
|
|
break;
|
|
default:
|
|
crash("bad type COMPARE");
|
|
}
|
|
if (true_label != NO_LABEL) {
|
|
compare(expr->nd_symb, true_label);
|
|
C_bra(false_label);
|
|
}
|
|
else {
|
|
truthvalue(expr->nd_symb);
|
|
}
|
|
break;
|
|
case IN:
|
|
/* In this case, evaluate right hand side first! The
|
|
INN instruction expects the bit number on top of the
|
|
stack
|
|
*/
|
|
CodePExpr(rightop);
|
|
CodePExpr(leftop);
|
|
CodeCoercion(leftop->nd_type, word_type);
|
|
C_inn(rightop->nd_type->tp_size);
|
|
if (true_label != NO_LABEL) {
|
|
C_zne(true_label);
|
|
C_bra(false_label);
|
|
}
|
|
break;
|
|
case OR:
|
|
case AND:
|
|
case '&': {
|
|
label l_maybe = ++text_label, l_end;
|
|
struct desig Des;
|
|
int genlabels = 0;
|
|
|
|
if (true_label == NO_LABEL) {
|
|
genlabels = 1;
|
|
true_label = ++text_label;
|
|
false_label = ++text_label;
|
|
l_end = ++text_label;
|
|
}
|
|
|
|
Des = InitDesig;
|
|
if (expr->nd_symb == OR) {
|
|
CodeExpr(leftop, &Des, true_label, l_maybe);
|
|
}
|
|
else CodeExpr(leftop, &Des, l_maybe, false_label);
|
|
C_df_ilb(l_maybe);
|
|
Des = InitDesig;
|
|
CodeExpr(rightop, &Des, true_label, false_label);
|
|
if (genlabels) {
|
|
C_df_ilb(true_label);
|
|
C_loc((arith)1);
|
|
C_bra(l_end);
|
|
C_df_ilb(false_label);
|
|
C_loc((arith)0);
|
|
C_df_ilb(l_end);
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
crash("(CodeOper) Bad operator %s\n",symbol2str(expr->nd_symb));
|
|
}
|
|
}
|
|
|
|
/* compare() serves as an auxiliary function of CodeOper */
|
|
compare(relop, lbl)
|
|
int relop;
|
|
register label lbl;
|
|
{
|
|
switch (relop) {
|
|
case '<':
|
|
C_zlt(lbl);
|
|
break;
|
|
case LESSEQUAL:
|
|
C_zle(lbl);
|
|
break;
|
|
case '>':
|
|
C_zgt(lbl);
|
|
break;
|
|
case GREATEREQUAL:
|
|
C_zge(lbl);
|
|
break;
|
|
case '=':
|
|
C_zeq(lbl);
|
|
break;
|
|
case '#':
|
|
C_zne(lbl);
|
|
break;
|
|
default:
|
|
crash("(compare)");
|
|
}
|
|
}
|
|
|
|
/* truthvalue() serves as an auxiliary function of CodeOper */
|
|
truthvalue(relop)
|
|
int relop;
|
|
{
|
|
switch (relop) {
|
|
case '<':
|
|
C_tlt();
|
|
break;
|
|
case LESSEQUAL:
|
|
C_tle();
|
|
break;
|
|
case '>':
|
|
C_tgt();
|
|
break;
|
|
case GREATEREQUAL:
|
|
C_tge();
|
|
break;
|
|
case '=':
|
|
C_teq();
|
|
break;
|
|
case '#':
|
|
C_tne();
|
|
break;
|
|
default:
|
|
crash("(truthvalue)");
|
|
}
|
|
}
|
|
|
|
CodeUoper(nd)
|
|
register struct node *nd;
|
|
{
|
|
register struct type *tp = nd->nd_type;
|
|
|
|
CodePExpr(nd->nd_right);
|
|
switch(nd->nd_symb) {
|
|
case '~':
|
|
case NOT:
|
|
C_teq();
|
|
break;
|
|
case '-':
|
|
switch(tp->tp_fund) {
|
|
case T_INTEGER:
|
|
case T_INTORCARD:
|
|
C_ngi(tp->tp_size);
|
|
break;
|
|
case T_REAL:
|
|
C_ngf(tp->tp_size);
|
|
break;
|
|
default:
|
|
crash("Bad operand to unary -");
|
|
}
|
|
break;
|
|
default:
|
|
crash("Bad unary operator");
|
|
}
|
|
}
|
|
|
|
CodeSet(nd)
|
|
register struct node *nd;
|
|
{
|
|
register struct type *tp = nd->nd_type;
|
|
|
|
nd = nd->nd_right;
|
|
while (nd) {
|
|
assert(nd->nd_class == Link && nd->nd_symb == ',');
|
|
|
|
if (nd->nd_left) CodeEl(nd->nd_left, tp);
|
|
nd = nd->nd_right;
|
|
}
|
|
}
|
|
|
|
CodeEl(nd, tp)
|
|
register struct node *nd;
|
|
register struct type *tp;
|
|
{
|
|
register struct type *eltype = ElementType(tp);
|
|
|
|
if (nd->nd_class == Link && nd->nd_symb == UPTO) {
|
|
C_loc(tp->tp_size); /* push size */
|
|
if (eltype->tp_fund == T_SUBRANGE) {
|
|
C_loc(eltype->sub_ub);
|
|
}
|
|
else C_loc((arith) (eltype->enm_ncst - 1));
|
|
Operands(nd->nd_left, nd->nd_right, word_type);
|
|
C_cal("_LtoUset"); /* library routine to fill set */
|
|
C_asp(4 * word_size);
|
|
}
|
|
else {
|
|
CodePExpr(nd);
|
|
C_set(tp->tp_size);
|
|
C_ior(tp->tp_size);
|
|
}
|
|
}
|
|
|
|
CodePExpr(nd)
|
|
register struct node *nd;
|
|
{
|
|
/* Generate code to push the value of the expression "nd"
|
|
on the stack.
|
|
*/
|
|
struct desig designator;
|
|
|
|
designator = InitDesig;
|
|
CodeExpr(nd, &designator, NO_LABEL, NO_LABEL);
|
|
CodeValue(&designator, nd->nd_type->tp_size, nd->nd_type->tp_align);
|
|
}
|
|
|
|
CodeDAddress(nd)
|
|
struct node *nd;
|
|
{
|
|
/* Generate code to push the address of the designator "nd"
|
|
on the stack.
|
|
*/
|
|
|
|
struct desig designator;
|
|
|
|
designator = InitDesig;
|
|
CodeDesig(nd, &designator);
|
|
CodeAddress(&designator);
|
|
}
|
|
|
|
CodeDStore(nd)
|
|
register struct node *nd;
|
|
{
|
|
/* Generate code to store the expression on the stack into the
|
|
designator "nd".
|
|
*/
|
|
|
|
struct desig designator;
|
|
|
|
designator = InitDesig;
|
|
CodeDesig(nd, &designator);
|
|
CodeStore(&designator, nd->nd_type->tp_size, nd->nd_type->tp_align);
|
|
}
|
|
|
|
DoHIGH(df)
|
|
register struct def *df;
|
|
{
|
|
/* Get the high index of a conformant array, indicated by "nd".
|
|
The high index is the second field in the descriptor of
|
|
the array, so it is easily found.
|
|
*/
|
|
register arith highoff;
|
|
|
|
assert(df->df_kind == D_VARIABLE);
|
|
assert(IsConformantArray(df->df_type));
|
|
|
|
highoff = df->var_off /* base address and descriptor */
|
|
+ 2 * word_size; /* skip base and first field of
|
|
descriptor
|
|
*/
|
|
if (df->df_scope->sc_level < proclevel) {
|
|
C_lxa((arith) (proclevel - df->df_scope->sc_level));
|
|
C_lof(highoff);
|
|
}
|
|
else C_lol(highoff);
|
|
}
|