1262 lines
24 KiB
C
1262 lines
24 KiB
C
/* 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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#include "debug.h"
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#include <assert.h>
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#include <em.h>
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#include <em_reg.h>
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#include <em_abs.h>
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#include "LLlex.h"
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#include "Lpars.h"
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#include "def.h"
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#include "desig.h"
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#include "f_info.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 "required.h"
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#include "scope.h"
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#include "type.h"
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int fp_used;
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CodeFil()
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{
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if ( !options['L'] )
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C_fil_dlb((label) 1, (arith) 0);
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}
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routine_label(df)
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register struct def * df;
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{
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df->prc_label = ++data_label;
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C_df_dlb(df->prc_label);
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C_rom_scon(df->df_idf->id_text, (arith)(strlen(df->df_idf->id_text) + 1));
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}
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RomString(nd)
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register struct node *nd;
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{
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C_df_dlb(++data_label);
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/* A string of the string_type is null-terminated. */
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if( nd->nd_type == string_type )
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C_rom_scon(nd->nd_STR, nd->nd_SLE + 1); /* with trailing '\0' */
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else
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C_rom_scon(nd->nd_STR, nd->nd_SLE); /* no trailing '\0' */
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nd->nd_SLA = data_label;
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}
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RomReal(nd)
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register struct node *nd;
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{
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if (! nd->nd_RLA) {
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C_df_dlb(++data_label);
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nd->nd_RLA = data_label;
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C_rom_fcon(nd->nd_REL, nd->nd_type->tp_size);
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}
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}
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BssVar()
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{
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/* generate bss segments for global variables */
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register struct def *df = GlobalScope->sc_def;
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while( df ) {
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if( df->df_kind == D_VARIABLE ) {
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C_df_dnam(df->var_name);
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/* ??? undefined value ??? */
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C_bss_cst(df->df_type->tp_size, (arith) 0, 0);
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}
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df = df->df_nextinscope;
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}
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}
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arith
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CodeGtoDescr(sc)
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register struct scope *sc;
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{
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/* Create code for goto descriptors
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*/
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register struct node *lb = sc->sc_lablist;
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int first = 1;
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while( lb ) {
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if( lb->nd_def->lab_descr ) {
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if( first ) {
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/* create local for target SP */
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sc->sc_off = -WA(pointer_size - sc->sc_off);
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C_ms_gto();
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first = 0;
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}
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C_df_dlb(lb->nd_def->lab_descr);
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C_rom_ilb(lb->nd_def->lab_no);
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C_rom_cst(sc->sc_off);
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}
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lb = lb->nd_next;
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}
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if( !first )
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return sc->sc_off;
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else
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return (arith) 0;
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}
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arith
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CodeBeginBlock(df)
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register struct def *df;
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{
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/* Generate code at the beginning of the main program,
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procedure or function.
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*/
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arith StackAdjustment = 0;
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arith offset = 0; /* offset to save StackPointer */
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TmpOpen(df->prc_vis->sc_scope);
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if ( df->df_kind == D_MODULE) /* nothing */ ;
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else if (df->df_kind == D_PROGRAM ) {
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C_exp("_m_a_i_n");
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C_pro_narg("_m_a_i_n");
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C_ms_par((arith) 0);
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offset = CodeGtoDescr(df->prc_vis->sc_scope);
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CodeFil();
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/* initialize external files */
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call_ini();
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/* ignore floating point underflow */
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C_lim();
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C_loc((arith) (1 << EFUNFL));
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C_ior(int_size);
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C_sim();
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}
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else if (df->df_kind & (D_PROCEDURE | D_FUNCTION)) {
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struct type *tp;
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register struct paramlist *param;
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C_pro_narg(df->prc_name);
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C_ms_par(df->df_type->prc_nbpar);
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offset = CodeGtoDescr(df->prc_vis->sc_scope);
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CodeFil();
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if( options['t'] ) {
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C_lae_dlb(df->prc_label,(arith)0);
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C_cal("procentry");
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C_asp(pointer_size);
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}
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/* prc_bool is the local variable that indicates if the
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* function result is assigned. This and can be disabled
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* with the -R option. The variable, however, is always
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* allocated and initialized.
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*/
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if( df->prc_res ) {
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C_zer((arith) int_size);
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C_stl(df->prc_bool);
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}
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for( param = ParamList(df->df_type); param; param = param->next) {
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if( !IsVarParam(param) ) {
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tp = TypeOfParam(param);
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if( IsConformantArray(tp) ) {
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/* Here, we have to make a copy of the
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array. We must also remember how much
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room is reserved for copies, because
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we have to adjust the stack pointer
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before we return.
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*/
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if( !StackAdjustment ) {
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/* First time we get here
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*/
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StackAdjustment = NewInt(0);
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C_loc((arith) 0);
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C_stl(StackAdjustment);
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}
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/* Address of array */
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C_lol(param->par_def->var_off);
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/* First compute size of the array */
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C_lol(tp->arr_cfdescr + word_size);
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C_inc();
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/* gives number of elements */
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C_lol(tp->arr_cfdescr + 2 * word_size);
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/* size of elements */
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C_mli(word_size);
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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 - 1);
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C_com(word_size);
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C_and(word_size);
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C_dup(word_size);
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C_lol(StackAdjustment);
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C_adi(word_size);
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C_stl(StackAdjustment);
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/* remember stack adjustments */
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C_los(word_size); /* copy */
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C_lor((arith) 1);
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/* push new address of array
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... downwards ... ???
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*/
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C_stl(param->par_def->var_off);
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}
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}
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}
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}
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else {
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crash("(CodeBeginBlock)");
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/*NOTREACHED*/
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}
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if( offset ) {
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/* save SP for non-local jump */
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C_lor((arith) 1);
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C_stl(offset);
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}
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return StackAdjustment;
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}
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CodeEndBlock(df, StackAdjustment)
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register struct def *df;
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arith StackAdjustment;
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{
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if( df->df_kind == D_PROGRAM) {
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C_loc((arith) 0);
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C_cal("_hlt");
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}
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else if (df->df_kind & (D_PROCEDURE | D_FUNCTION)) {
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struct type *tp;
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if( StackAdjustment ) {
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/* remove copies of conformant arrays */
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C_lol(StackAdjustment);
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C_ass(word_size);
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FreeInt(StackAdjustment);
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}
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if( !options['n'] )
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RegisterMessages(df->prc_vis->sc_scope->sc_def);
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if( options['t'] ) {
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C_lae_dlb(df->prc_label,(arith)0);
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C_cal("procexit");
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C_asp(pointer_size);
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}
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if( tp = ResultType(df->df_type) ) {
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if( !options['R'] ) {
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C_lin((arith)LineNumber);
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C_lol(df->prc_bool);
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C_cal("_nfa");
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C_asp(word_size);
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}
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if( tp->tp_size == word_size )
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C_lol(-tp->tp_size);
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else if( tp->tp_size == 2 * word_size )
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C_ldl(-tp->tp_size);
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else {
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C_lal(-tp->tp_size);
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C_loi(tp->tp_size);
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}
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C_ret(tp->tp_size);
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}
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else
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C_ret((arith) 0);
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}
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else {
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crash("(CodeEndBlock)");
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/*NOTREACHED*/
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}
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C_end(- df->prc_vis->sc_scope->sc_off);
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TmpClose();
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}
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CodeExpr(nd, ds, true_label)
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register struct node *nd;
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register struct desig *ds;
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label true_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 Value:
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switch( nd->nd_symb ) {
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case INTEGER:
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C_loc(nd->nd_INT);
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break;
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case REAL:
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RomReal(nd);
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C_lae_dlb(nd->nd_RLA, (arith) 0);
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C_loi(tp->tp_size);
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break;
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case STRING:
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if( tp->tp_fund == T_CHAR )
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C_loc(nd->nd_INT);
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else
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C_lae_dlb(nd->nd_SLA, (arith) 0);
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break;
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case NIL:
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C_zer(pointer_size);
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break;
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default:
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crash("(CodeExpr Value)");
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/*NOTREACHED*/
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}
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ds->dsg_kind = DSG_LOADED;
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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 Boper:
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CodeBoper(nd, true_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 Set: {
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register arith *st = nd->nd_set;
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register int i;
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ds->dsg_kind = DSG_LOADED;
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if( !st ) {
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C_zer(tp->tp_size);
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break;
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}
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for( i = tp->tp_size / word_size, st += i; i > 0; i--)
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C_loc(*--st);
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}
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break;
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case Xset:
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CodeSet(nd);
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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 NameOrCall: {
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/* actual procedure/function parameter */
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struct node *left = nd->nd_left;
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struct def *df = left->nd_def;
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if( df->df_kind & D_ROUTINE ) {
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int level = df->df_scope->sc_level;
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if( level <= 0 || (df->df_flags & D_EXTERNAL) )
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C_zer(pointer_size);
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else
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C_lxl((arith) (proclevel - level));
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C_lpi(df->prc_name);
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ds->dsg_kind = DSG_LOADED;
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break;
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}
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assert(df->df_kind == D_VARIABLE);
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assert(df->df_type->tp_fund & T_ROUTINE);
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CodeDesig(left, ds);
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break;
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}
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case Arrow:
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case Arrsel:
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case Def:
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case LinkDef:
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CodeDesig(nd, ds);
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break;
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case Cast: {
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/* convert integer to real */
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struct node *right = nd->nd_right;
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CodePExpr(right);
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Int2Real(right->nd_type->tp_size);
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ds->dsg_kind = DSG_LOADED;
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break;
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}
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case IntCoerc: {
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/* convert integer to long integer */
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struct node *right = nd->nd_right;
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CodePExpr(right);
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Int2Long();
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ds->dsg_kind = DSG_LOADED;
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break;
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}
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case IntReduc: {
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/* convert a long to an integer */
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struct node *right = nd->nd_right;
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CodePExpr(right);
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Long2Int();
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ds->dsg_kind = DSG_LOADED;
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break;
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}
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default:
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crash("(CodeExpr : bad node type)");
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/*NOTREACHED*/
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} /* switch class */
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if( true_label ) {
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/* Only for boolean expressions
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*/
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CodeValue(ds, tp);
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C_zeq(true_label);
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}
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}
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CodeUoper(nd)
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register struct node *nd;
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{
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register struct type *tp = nd->nd_type;
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CodePExpr(nd->nd_right);
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switch( nd->nd_symb ) {
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case '-':
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assert(tp->tp_fund & T_NUMERIC);
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if( tp->tp_fund == T_INTEGER || tp->tp_fund == T_LONG )
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C_ngi(tp->tp_size);
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else
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C_ngf(tp->tp_size);
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break;
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case NOT:
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C_teq();
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break;
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case '(':
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break;
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default:
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crash("(CodeUoper)");
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/*NOTREACHED*/
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}
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}
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Operands(leftop, rightop)
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register struct node *leftop, *rightop;
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{
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CodePExpr(leftop);
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CodePExpr(rightop);
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}
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CodeBoper(expr, true_label)
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register struct node *expr; /* the expression tree itself */
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label true_label; /* label to jump to in logical exprs */
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{
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register struct node *leftop = expr->nd_left;
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register struct node *rightop = expr->nd_right;
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register struct type *tp = expr->nd_type;
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switch( expr->nd_symb ) {
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case '+':
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Operands(leftop, rightop);
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switch( tp->tp_fund ) {
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case T_INTEGER:
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case T_LONG:
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C_adi(tp->tp_size);
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break;
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case T_REAL:
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C_adf(tp->tp_size);
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break;
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case T_SET:
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C_ior(tp->tp_size);
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break;
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default:
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crash("(CodeBoper: bad type +)");
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}
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break;
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case '-':
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Operands(leftop, rightop);
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switch( tp->tp_fund ) {
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case T_INTEGER:
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case T_LONG:
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C_sbi(tp->tp_size);
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break;
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case T_REAL:
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C_sbf(tp->tp_size);
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break;
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case T_SET:
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C_com(tp->tp_size);
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C_and(tp->tp_size);
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break;
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default:
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crash("(CodeBoper: bad type -)");
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}
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break;
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case '*':
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Operands(leftop, rightop);
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switch( tp->tp_fund ) {
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case T_INTEGER:
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case T_LONG:
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C_mli(tp->tp_size);
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break;
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case T_REAL:
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C_mlf(tp->tp_size);
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break;
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case T_SET:
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C_and(tp->tp_size);
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break;
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default:
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crash("(CodeBoper: bad type *)");
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}
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break;
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case '/':
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Operands(leftop, rightop);
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if( tp->tp_fund == T_REAL )
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C_dvf(tp->tp_size);
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else
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crash("(CodeBoper: bad type /)");
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break;
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case DIV:
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case MOD:
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Operands(leftop, rightop);
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if( tp->tp_fund == T_INTEGER ) {
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C_cal(expr->nd_symb == MOD ? "_mdi" : "_dvi");
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C_asp(2 * tp->tp_size);
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C_lfr(tp->tp_size);
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}
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else if( tp->tp_fund == T_LONG) {
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C_cal(expr->nd_symb == MOD ? "_mdil" : "_dvil");
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C_asp(2 * tp->tp_size);
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C_lfr(tp->tp_size);
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}
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else
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crash("(CodeBoper: bad type MOD)");
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break;
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case '<':
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case LESSEQUAL:
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case '>':
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case GREATEREQUAL:
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case '=':
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case NOTEQUAL:
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CodePExpr(leftop);
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CodePExpr(rightop);
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tp = BaseType(rightop->nd_type);
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switch( tp->tp_fund ) {
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case T_INTEGER:
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case T_LONG:
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C_cmi(tp->tp_size);
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break;
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case T_REAL:
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C_cmf(tp->tp_size);
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break;
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case T_ENUMERATION:
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case T_CHAR:
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C_cmu(word_size);
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break;
|
|
case T_POINTER:
|
|
C_cmp();
|
|
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);
|
|
expr->nd_symb = '=';
|
|
}
|
|
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);
|
|
expr->nd_symb = '=';
|
|
}
|
|
C_cms(tp->tp_size);
|
|
break;
|
|
|
|
case T_STRINGCONST:
|
|
case T_ARRAY:
|
|
C_loc((arith) IsString(tp));
|
|
C_cal("_bcp");
|
|
C_asp(2 * pointer_size + word_size);
|
|
C_lfr(word_size);
|
|
break;
|
|
|
|
case T_STRING:
|
|
C_cmp();
|
|
break;
|
|
|
|
default:
|
|
crash("(CodeBoper : bad type COMPARE)");
|
|
}
|
|
truthvalue(expr->nd_symb);
|
|
if( true_label != NO_LABEL )
|
|
C_zeq(true_label);
|
|
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);
|
|
if( rightop->nd_type == emptyset_type )
|
|
C_and(rightop->nd_type->tp_size);
|
|
else
|
|
C_inn(rightop->nd_type->tp_size);
|
|
|
|
if( true_label != NO_LABEL )
|
|
C_zeq(true_label);
|
|
break;
|
|
|
|
case AND:
|
|
case OR:
|
|
Operands(leftop, rightop);
|
|
if( expr->nd_symb == AND )
|
|
C_and(tp->tp_size);
|
|
else
|
|
C_ior(tp->tp_size);
|
|
if( true_label != NO_LABEL )
|
|
C_zeq(true_label);
|
|
break;
|
|
default:
|
|
crash("(CodeBoper Bad operator %s\n)",
|
|
symbol2str(expr->nd_symb));
|
|
}
|
|
}
|
|
|
|
/* truthvalue() serves as an auxiliary function of CodeBoper */
|
|
truthvalue(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 NOTEQUAL:
|
|
C_tne();
|
|
break;
|
|
default:
|
|
crash("(truthvalue)");
|
|
/*NOTREACHED*/
|
|
}
|
|
}
|
|
|
|
CodeSet(nd)
|
|
register struct node *nd;
|
|
{
|
|
register struct type *tp = nd->nd_type;
|
|
|
|
C_zer(tp->tp_size);
|
|
nd = nd->nd_right;
|
|
while( nd ) {
|
|
assert(nd->nd_class == Link && nd->nd_symb == ',');
|
|
|
|
CodeEl(nd->nd_left, tp);
|
|
nd = nd->nd_right;
|
|
}
|
|
}
|
|
|
|
CodeEl(nd, tp)
|
|
register struct node *nd;
|
|
register struct type *tp;
|
|
{
|
|
if( nd->nd_class == Link && nd->nd_symb == UPTO ) {
|
|
Operands(nd->nd_left, nd->nd_right);
|
|
C_loc(tp->tp_size); /* push size */
|
|
C_cal("_bts"); /* library routine to fill set */
|
|
C_asp(3 * word_size);
|
|
}
|
|
else {
|
|
CodePExpr(nd);
|
|
C_set(tp->tp_size);
|
|
C_ior(tp->tp_size);
|
|
}
|
|
}
|
|
|
|
struct type *
|
|
CodeParameters(param, arg)
|
|
struct paramlist *param;
|
|
struct node *arg;
|
|
{
|
|
register struct type *tp, *left_tp, *last_tp = (struct type *) 0;
|
|
struct node *left;
|
|
struct desig ds;
|
|
|
|
assert(param && arg);
|
|
|
|
if( param->next )
|
|
last_tp = CodeParameters(param->next, arg->nd_right);
|
|
|
|
tp = TypeOfParam(param);
|
|
left = arg->nd_left;
|
|
left_tp = left->nd_type;
|
|
|
|
if( IsConformantArray(tp) ) {
|
|
if( last_tp != tp )
|
|
/* push descriptors only once */
|
|
CodeConfDescr(tp, left_tp);
|
|
|
|
CodeDAddress(left);
|
|
return tp;
|
|
}
|
|
if( IsVarParam(param) ) {
|
|
CodeDAddress(left);
|
|
return tp;
|
|
}
|
|
if( left_tp->tp_fund == T_STRINGCONST ) {
|
|
CodePString(left, tp);
|
|
return tp;
|
|
}
|
|
|
|
ds = InitDesig;
|
|
CodeExpr(left, &ds, NO_LABEL);
|
|
CodeValue(&ds, left_tp);
|
|
|
|
RangeCheck(tp, left_tp);
|
|
if( tp == real_type && BaseType(left_tp) == int_type )
|
|
Int2Real(int_size);
|
|
|
|
return tp;
|
|
}
|
|
|
|
CodeConfDescr(ftp, atp)
|
|
register struct type *ftp, *atp;
|
|
{
|
|
struct type *elemtp = ftp->arr_elem;
|
|
|
|
if( IsConformantArray(elemtp) )
|
|
CodeConfDescr(elemtp, atp->arr_elem);
|
|
|
|
if( atp->tp_fund == T_STRINGCONST ) {
|
|
C_loc((arith) 1);
|
|
C_loc(atp->tp_psize - 1);
|
|
C_loc((arith) 1);
|
|
}
|
|
else if( IsConformantArray(atp) ) {
|
|
if( atp->arr_sclevel < proclevel ) {
|
|
C_lxa((arith) proclevel - atp->arr_sclevel);
|
|
C_adp(atp->arr_cfdescr);
|
|
}
|
|
else
|
|
C_lal(atp->arr_cfdescr);
|
|
|
|
C_loi(3 * word_size);
|
|
}
|
|
else { /* normal array */
|
|
assert(atp->tp_fund == T_ARRAY);
|
|
assert(!IsConformantArray(atp));
|
|
C_lae_dlb(atp->arr_ardescr, (arith) 0);
|
|
C_loi( 3 * word_size);
|
|
}
|
|
}
|
|
|
|
CodePString(nd, tp)
|
|
struct node *nd;
|
|
struct type *tp;
|
|
{
|
|
/* no null padding */
|
|
C_lae_dlb(nd->nd_SLA, (arith) 0);
|
|
C_loi(tp->tp_size);
|
|
}
|
|
|
|
CodeCall(nd)
|
|
register struct node *nd;
|
|
{
|
|
/* Generate code for a procedure call. Checking of parameters
|
|
and result is already done.
|
|
*/
|
|
register struct node *left = nd->nd_left;
|
|
register struct node *right = nd->nd_right;
|
|
register struct def *df = left->nd_def;
|
|
register struct type *result_tp;
|
|
|
|
assert(IsProcCall(left));
|
|
|
|
if( left->nd_type == std_type ) {
|
|
CodeStd(nd);
|
|
return;
|
|
}
|
|
|
|
if( right )
|
|
(void) CodeParameters(ParamList(left->nd_type), right);
|
|
|
|
assert(left->nd_class == Def);
|
|
|
|
|
|
if( df->df_kind & D_ROUTINE ) {
|
|
int level = df->df_scope->sc_level;
|
|
|
|
if( level > 0 && !(df->df_flags & D_EXTERNAL) )
|
|
C_lxl((arith) (proclevel - level));
|
|
C_cal(df->prc_name);
|
|
C_asp(left->nd_type->prc_nbpar);
|
|
}
|
|
else {
|
|
label l1 = ++text_label;
|
|
label l2 = ++text_label;
|
|
|
|
assert(df->df_kind == D_VARIABLE);
|
|
|
|
/* Push value of procedure/function parameter */
|
|
CodePExpr(left);
|
|
|
|
/* Test if value is a global or local procedure/function */
|
|
C_exg(pointer_size);
|
|
C_dup(pointer_size);
|
|
C_zer(pointer_size);
|
|
C_cmp();
|
|
|
|
C_zeq(l1);
|
|
/* At this point, on top of the stack the LB */
|
|
C_exg(pointer_size);
|
|
/* Now, the name of the procedure/function */
|
|
C_cai();
|
|
C_asp(pointer_size + left->nd_type->prc_nbpar);
|
|
C_bra(l2);
|
|
|
|
/* value is a global procedure/function */
|
|
C_df_ilb(l1);
|
|
C_asp(pointer_size); /* no LB needed */
|
|
C_cai();
|
|
C_asp(left->nd_type->prc_nbpar);
|
|
C_df_ilb(l2);
|
|
}
|
|
|
|
if( result_tp = ResultType(left->nd_type) )
|
|
C_lfr(result_tp->tp_size);
|
|
}
|
|
|
|
CodeStd(nd)
|
|
struct node *nd;
|
|
{
|
|
register struct node *arg = nd->nd_right;
|
|
register struct node *left = arg->nd_left;
|
|
register struct type *tp = BaseType(left->nd_type);
|
|
int req = nd->nd_left->nd_def->df_value.df_reqname;
|
|
|
|
assert(arg->nd_class == Link && arg->nd_symb == ',');
|
|
|
|
switch( req ) {
|
|
case R_ABS:
|
|
CodePExpr(left);
|
|
if( tp == int_type )
|
|
C_cal("_abi");
|
|
else if ( tp == long_type )
|
|
C_cal("_abl");
|
|
else
|
|
C_cal("_abr");
|
|
C_asp(tp->tp_size);
|
|
C_lfr(tp->tp_size);
|
|
break;
|
|
|
|
case R_SQR:
|
|
CodePExpr(left);
|
|
C_dup(tp->tp_size);
|
|
if( tp == int_type || tp == long_type )
|
|
C_mli(tp->tp_size);
|
|
else
|
|
C_mlf(real_size);
|
|
break;
|
|
|
|
case R_SIN:
|
|
case R_COS:
|
|
case R_EXP:
|
|
case R_LN:
|
|
case R_SQRT:
|
|
case R_ARCTAN:
|
|
assert(tp == real_type);
|
|
CodePExpr(left);
|
|
switch( req ) {
|
|
case R_SIN:
|
|
C_cal("_sin");
|
|
break;
|
|
case R_COS:
|
|
C_cal("_cos");
|
|
break;
|
|
case R_EXP:
|
|
C_cal("_exp");
|
|
break;
|
|
case R_LN:
|
|
C_cal("_log");
|
|
break;
|
|
case R_SQRT:
|
|
C_cal("_sqt");
|
|
break;
|
|
case R_ARCTAN:
|
|
C_cal("_atn");
|
|
break;
|
|
default:
|
|
crash("(CodeStd)");
|
|
/*NOTREACHED*/
|
|
}
|
|
C_asp(real_size);
|
|
C_lfr(real_size);
|
|
break;
|
|
|
|
case R_TRUNC:
|
|
assert(tp == real_type);
|
|
CodePExpr(left);
|
|
Real2Int();
|
|
break;
|
|
|
|
case R_ROUND:
|
|
assert(tp == real_type);
|
|
CodePExpr(left);
|
|
C_cal("_rnd");
|
|
C_asp(real_size);
|
|
C_lfr(real_size);
|
|
Real2Int();
|
|
break;
|
|
|
|
case R_ORD:
|
|
CodePExpr(left);
|
|
break;
|
|
|
|
case R_CHR:
|
|
CodePExpr(left);
|
|
genrck(char_type);
|
|
break;
|
|
|
|
case R_SUCC:
|
|
case R_PRED:
|
|
CodePExpr(left);
|
|
C_loc((arith)1);
|
|
if( tp == long_type) Int2Long();
|
|
|
|
if( req == R_SUCC )
|
|
C_adi(tp->tp_size);
|
|
else
|
|
C_sbi(tp->tp_size);
|
|
|
|
if( bounded(left->nd_type) )
|
|
genrck(left->nd_type);
|
|
break;
|
|
|
|
case R_ODD:
|
|
CodePExpr(left);
|
|
C_loc((arith) 1);
|
|
if( tp == long_type ) Int2Long();
|
|
C_and(tp->tp_size);
|
|
if( tp == long_type ) Long2Int(); /* bool_size == int_size */
|
|
break;
|
|
|
|
case R_EOF:
|
|
case R_EOLN:
|
|
CodeDAddress(left);
|
|
if( req == R_EOF )
|
|
C_cal("_efl");
|
|
else
|
|
C_cal("_eln");
|
|
C_asp(pointer_size);
|
|
C_lfr(word_size);
|
|
break;
|
|
|
|
case R_REWRITE:
|
|
case R_RESET:
|
|
CodeDAddress(left);
|
|
if( tp == text_type )
|
|
C_loc((arith) 0);
|
|
else
|
|
C_loc(tp->next->tp_psize);
|
|
/* ??? elements of packed size ??? */
|
|
if( req == R_REWRITE )
|
|
C_cal("_cre");
|
|
else
|
|
C_cal("_opn");
|
|
C_asp(pointer_size + word_size);
|
|
break;
|
|
|
|
case R_PUT:
|
|
case R_GET:
|
|
CodeDAddress(left);
|
|
if( req == R_PUT )
|
|
C_cal("_put");
|
|
else
|
|
C_cal("_get");
|
|
C_asp(pointer_size);
|
|
break;
|
|
|
|
case R_PAGE:
|
|
CodeDAddress(left);
|
|
C_cal("_pag");
|
|
C_asp(pointer_size);
|
|
break;
|
|
|
|
case R_PACK: {
|
|
label lba = tp->arr_ardescr;
|
|
|
|
|
|
CodeDAddress(left);
|
|
arg = arg->nd_right;
|
|
left = arg->nd_left;
|
|
CodePExpr(left);
|
|
arg = arg->nd_right;
|
|
left = arg->nd_left;
|
|
CodeDAddress(left);
|
|
C_lae_dlb(left->nd_type->arr_ardescr, (arith) 0);
|
|
C_lae_dlb(lba, (arith) 0);
|
|
C_cal("_pac");
|
|
C_asp(4 * pointer_size + word_size);
|
|
break;
|
|
}
|
|
|
|
case R_UNPACK: {
|
|
/* change sequence of arguments of the library routine
|
|
_unp to merge code of R_PACK and R_UNPACK.
|
|
*/
|
|
label lba, lbz = tp->arr_ardescr;
|
|
|
|
tp = tp->arr_elem;
|
|
if (tp->tp_fund == T_SUBRANGE &&
|
|
tp->sub_lb >= 0) {
|
|
C_loc((arith) 1);
|
|
}
|
|
else C_loc((arith) 0);
|
|
CodeDAddress(left);
|
|
arg = arg->nd_right;
|
|
left = arg->nd_left;
|
|
CodeDAddress(left);
|
|
lba = left->nd_type->arr_ardescr;
|
|
arg = arg->nd_right;
|
|
left = arg->nd_left;
|
|
CodePExpr(left);
|
|
C_lae_dlb(lbz, (arith) 0);
|
|
C_lae_dlb(lba, (arith) 0);
|
|
C_cal("_unp");
|
|
C_asp(4 * pointer_size + 2 * word_size);
|
|
break;
|
|
}
|
|
|
|
case R_NEW:
|
|
case R_DISPOSE:
|
|
CodeDAddress(left);
|
|
C_loc(PointedtoType(tp)->tp_size);
|
|
if( req == R_NEW )
|
|
C_cal("_new");
|
|
else
|
|
C_cal("_dis");
|
|
C_asp(pointer_size + word_size);
|
|
break;
|
|
|
|
case R_MARK:
|
|
case R_RELEASE:
|
|
CodeDAddress(left);
|
|
if( req == R_MARK )
|
|
C_cal("_sav");
|
|
else
|
|
C_cal("_rst");
|
|
C_asp(pointer_size);
|
|
break;
|
|
|
|
case R_HALT:
|
|
if( left )
|
|
CodePExpr(left);
|
|
else
|
|
C_zer(int_size);
|
|
C_cal("_hlt"); /* can't return */
|
|
C_asp(int_size); /* help the optimizer(s) */
|
|
break;
|
|
|
|
default:
|
|
crash("(CodeStd)");
|
|
/*NOTREACHED*/
|
|
}
|
|
}
|
|
|
|
Long2Int()
|
|
{
|
|
/* convert a long to integer */
|
|
|
|
if (int_size == long_size) return;
|
|
|
|
C_loc(long_size);
|
|
C_loc(int_size);
|
|
C_cii();
|
|
}
|
|
|
|
Int2Long()
|
|
{
|
|
/* convert integer to long */
|
|
|
|
if (int_size == long_size) return;
|
|
C_loc(int_size);
|
|
C_loc(long_size);
|
|
C_cii();
|
|
}
|
|
|
|
Int2Real(size) /* size is different for integers and longs */
|
|
arith size;
|
|
{
|
|
/* convert integer to real */
|
|
C_loc(size);
|
|
C_loc(real_size);
|
|
C_cif();
|
|
}
|
|
|
|
Real2Int()
|
|
{
|
|
/* convert real to integer */
|
|
C_loc(real_size);
|
|
C_loc(int_size);
|
|
C_cfi();
|
|
}
|
|
|
|
RangeCheck(tpl, tpr)
|
|
register struct type *tpl, *tpr;
|
|
{
|
|
/* Generate a range check if neccessary
|
|
*/
|
|
|
|
arith llo, lhi, rlo, rhi;
|
|
|
|
if( bounded(tpl) ) {
|
|
/* in this case we might need a range check */
|
|
if( !bounded(tpr) )
|
|
/* yes, we need one */
|
|
genrck(tpl);
|
|
else {
|
|
/* both types are restricted. check the bounds to see
|
|
whether we need a range check. We don't need one
|
|
if the range of values of the 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);
|
|
}
|
|
}
|
|
}
|
|
|
|
genrck(tp)
|
|
register struct type *tp;
|
|
{
|
|
/* Generate a range check descriptor for type "tp" when
|
|
necessary. Return its label.
|
|
*/
|
|
|
|
arith lb, ub;
|
|
register label o1;
|
|
int newlabel = 0;
|
|
|
|
if( options['R'] ) return;
|
|
|
|
getbounds(tp, &lb, &ub);
|
|
|
|
if( tp->tp_fund == T_SUBRANGE ) {
|
|
if( !(o1 = tp->sub_rck) ) {
|
|
tp->sub_rck = o1 = ++data_label;
|
|
newlabel = 1;
|
|
}
|
|
}
|
|
else if( !(o1 = tp->enm_rck) ) {
|
|
tp->enm_rck = o1 = ++data_label;
|
|
newlabel = 1;
|
|
}
|
|
if( newlabel ) {
|
|
C_df_dlb(o1);
|
|
C_rom_cst(lb);
|
|
C_rom_cst(ub);
|
|
}
|
|
C_lae_dlb(o1, (arith) 0);
|
|
C_rck(word_size);
|
|
}
|
|
|
|
CodePExpr(nd)
|
|
register struct node *nd;
|
|
{
|
|
/* Generate code to push the value of the expression "nd"
|
|
on the stack.
|
|
*/
|
|
|
|
struct desig designator;
|
|
struct type *tp = BaseType(nd->nd_type);
|
|
|
|
designator = InitDesig;
|
|
CodeExpr(nd, &designator, NO_LABEL);
|
|
if( tp->tp_fund & (T_ARRAY | T_RECORD) )
|
|
CodeAddress(&designator);
|
|
else
|
|
CodeValue(&designator, nd->nd_type);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
RegisterMessages(df)
|
|
register struct def *df;
|
|
{
|
|
register struct type *tp;
|
|
|
|
for( ; df; df = df->df_nextinscope ) {
|
|
if( df->df_kind == D_VARIABLE && !(df->df_flags & D_NOREG) ) {
|
|
/* Examine type and size
|
|
*/
|
|
tp = BaseType(df->df_type);
|
|
if( df->df_flags & D_VARPAR || tp->tp_fund & T_POINTER )
|
|
C_ms_reg(df->var_off, pointer_size,
|
|
reg_pointer, 0);
|
|
|
|
else if( df->df_flags & D_LOOPVAR )
|
|
C_ms_reg(df->var_off, tp->tp_size, reg_loop,2);
|
|
else if( tp->tp_fund & T_NUMERIC )
|
|
C_ms_reg(df->var_off, tp->tp_size,
|
|
tp->tp_fund == T_REAL ? reg_float : reg_any, 0);
|
|
}
|
|
}
|
|
}
|