599 lines
11 KiB
C
599 lines
11 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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#ifndef NORCSID
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static char *RcsId = "$Header$";
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#endif
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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 <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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extern label data_label();
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extern label text_label();
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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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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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label dlab;
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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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C_df_dlb(dlab = data_label());
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C_rom_icon(long2str((long) cst), 10);
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C_lae_dlb(dlab, (arith) 0);
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C_loi(size);
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}
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}
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CodeString(nd)
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struct node *nd;
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{
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label lab;
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if (nd->nd_type == charc_type) {
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C_loc(nd->nd_INT);
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return;
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}
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C_df_dlb(lab = data_label());
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C_rom_scon(nd->nd_STR, nd->nd_SLE);
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C_lae_dlb(lab);
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}
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CodeReal(nd)
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struct node *nd;
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{
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label lab;
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C_df_dlb(lab = data_label());
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C_rom_fcon(nd->nd_REL, nd->nd_type->tp_size);
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C_lae_dlb(lab);
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C_loi(nd->nd_type->tp_size);
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}
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CodeExpr(nd, ds, true_label, false_label)
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struct node *nd;
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struct desig *ds;
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label true_label, false_label;
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{
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switch(nd->nd_class) {
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case Def:
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CodeDesig(nd, ds);
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break;
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case Oper:
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if (nd->nd_symb == '[') {
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CodeDesig(nd, ds);
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break;
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}
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CodeOper(nd, true_label, false_label);
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if (true_label == 0) ds->dsg_kind = DSG_LOADED;
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else {
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*ds = InitDesig;
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true_label = 0;
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}
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break;
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case Uoper:
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if (nd->nd_symb == '^') {
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CodeDesig(nd, ds);
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break;
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}
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CodeExpr(nd->nd_right, ds, NO_LABEL, NO_LABEL);
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CodeValue(ds, nd->nd_right->nd_type->tp_size);
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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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CodeReal(nd);
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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, nd->nd_type->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 Link:
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CodeDesig(nd, ds);
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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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/* ??? */
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ds->dsg_kind = DSG_LOADED;
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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 != 0) {
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CodeValue(ds, nd->nd_type->tp_size);
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*ds = InitDesig;
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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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struct type *t1, *t2;
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{
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/* ??? */
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}
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CodeCall(nd)
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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 *arg = nd;
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register struct paramlist *param;
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struct type *tp;
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arith pushed = 0;
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struct desig Des;
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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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tp = left->nd_type;
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if (left->nd_class == Def &&
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(left->nd_def->df_kind & (D_TYPE|D_HTYPE|D_HIDDEN))) {
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/* it was just a cast. Simply ignore it
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*/
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Des = InitDesig;
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CodeExpr(nd->nd_right->nd_left, &Des, NO_LABEL, NO_LABEL);
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CodeValue(&Des);
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*nd = *(nd->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(tp->tp_fund == T_PROCEDURE);
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for (param = left->nd_type->prc_params; param; param = param->next) {
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Des = InitDesig;
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arg = arg->nd_right;
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assert(arg != 0);
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if (param->par_var) {
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CodeDesig(arg->nd_left, &Des);
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CodeAddress(&Des);
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pushed += pointer_size;
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}
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else {
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CodeExpr(arg->nd_left, &Des, NO_LABEL, NO_LABEL);
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CodeValue(&Des, arg->nd_left->nd_type->tp_size);
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pushed += align(arg->nd_left->nd_type->tp_size, word_align);
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}
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/* ??? Conformant arrays */
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}
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if (left->nd_class == Def && left->nd_def->df_kind == D_PROCEDURE) {
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if (left->nd_def->df_scope->sc_level > 0) {
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C_lxl((arith) proclevel - left->nd_def->df_scope->sc_level);
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pushed += pointer_size;
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}
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C_cal(left->nd_def->prc_vis->sc_scope->sc_name);
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}
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else if (left->nd_class == Def && left->nd_def->df_kind == D_PROCHEAD) {
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C_cal(left->nd_def->for_name);
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}
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else {
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Des = InitDesig;
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CodeDesig(left, &Des);
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CodeAddress(&Des);
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C_cai();
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}
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C_asp(pushed);
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if (tp->next) {
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C_lfr(align(tp->next->tp_size, word_align));
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}
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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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/* ??? */
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}
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CodeAssign(nd, dst, dss)
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struct node *nd;
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struct desig *dst, *dss;
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{
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/* Generate code for an assignment. Testing of type
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compatibility and the like is already done.
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*/
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CodeCoercion(nd->nd_right->nd_type, nd->nd_left->nd_type);
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/* ??? */
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}
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Operands(leftop, rightop)
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struct node *leftop, *rightop;
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{
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struct desig Des;
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Des = InitDesig;
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CodeExpr(leftop, &Des, NO_LABEL, NO_LABEL);
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CodeValue(&Des, leftop->nd_type->tp_size);
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Des = InitDesig;
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if (rightop->nd_type->tp_fund == T_POINTER &&
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leftop->nd_type->tp_size != pointer_size) {
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CodeCoercion(leftop->nd_type, rightop->nd_type);
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leftop->nd_type = rightop->nd_type;
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}
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CodeExpr(rightop, &Des, NO_LABEL, NO_LABEL);
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CodeValue(&Des, rightop->nd_type->tp_size);
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}
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CodeOper(expr, true_label, false_label)
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struct node *expr; /* the expression tree itself */
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label true_label;
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label false_label; /* labels to jump to in logical expr's */
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{
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register int oper = expr->nd_symb;
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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 (oper) {
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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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C_adi(tp->tp_size);
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break;
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case T_POINTER:
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C_ads(rightop->nd_type->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_CARDINAL:
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C_adu(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("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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C_sbi(tp->tp_size);
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break;
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case T_POINTER:
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if (rightop->nd_type->tp_fund == T_POINTER) {
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C_sbs(pointer_size);
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}
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else {
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C_ngi(rightop->nd_type->tp_size);
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C_ads(rightop->nd_type->tp_size);
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}
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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_CARDINAL:
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C_sbu(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("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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C_mli(tp->tp_size);
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break;
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case T_POINTER:
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CodeCoercion(rightop->nd_type, tp);
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/* Fall through */
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case T_CARDINAL:
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C_mlu(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("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_REAL:
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C_dvf(tp->tp_size);
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break;
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case T_SET:
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C_xor(tp->tp_size);
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break;
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default:
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crash("bad type /");
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}
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break;
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case DIV:
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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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C_dvi(tp->tp_size);
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break;
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case T_POINTER:
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CodeCoercion(rightop->nd_type, tp);
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/* Fall through */
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case T_CARDINAL:
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C_dvu(tp->tp_size);
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break;
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default:
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crash("bad type DIV");
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}
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break;
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case MOD:
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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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C_rmi(tp->tp_size);
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break;
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case T_POINTER:
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CodeCoercion(rightop->nd_type, tp);
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/* Fall through */
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case T_CARDINAL:
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C_rmu(tp->tp_size);
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break;
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default:
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crash("bad type MOD");
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}
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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 UNEQUAL:
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case '#':
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Operands(leftop, rightop);
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CodeCoercion(rightop->nd_type, leftop->nd_type);
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switch (tp->tp_fund) {
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case T_INTEGER:
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C_cmi(leftop->nd_type->tp_size);
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break;
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case T_POINTER:
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C_cmp();
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break;
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case T_CARDINAL:
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C_cmu(leftop->nd_type->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;
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case T_REAL:
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C_cmf(leftop->nd_type->tp_size);
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break;
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case T_SET:
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C_cms(leftop->nd_type->tp_size);
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break;
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default:
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crash("bad type COMPARE");
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}
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if (true_label != 0) {
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compare(oper, true_label);
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C_bra(false_label);
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}
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else {
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truthvalue(oper);
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}
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break;
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case IN:
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Operands(leftop, rightop);
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CodeCoercion(rightop->nd_type, word_type);
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C_inn(leftop->nd_type->tp_size);
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break;
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case AND:
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case '&':
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if (true_label == 0) {
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label l_true = text_label();
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label l_false = text_label();
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label l_maybe = text_label();
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label l_end = text_label();
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struct desig Des;
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Des = InitDesig;
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CodeExpr(leftop, &Des, l_maybe, l_false);
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C_df_ilb(l_maybe);
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Des = InitDesig;
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CodeExpr(rightop, &Des, l_true, l_false);
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C_df_ilb(l_true);
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C_loc((arith)1);
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C_bra(l_end);
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C_df_ilb(l_false);
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C_loc((arith)0);
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C_df_ilb(l_end);
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}
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else {
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label l_maybe = text_label();
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struct desig Des;
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Des = InitDesig;
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CodeExpr(leftop, &Des, l_maybe, false_label);
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Des = InitDesig;
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C_df_ilb(l_maybe);
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CodeExpr(rightop, &Des, true_label, false_label);
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}
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break;
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case OR:
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if (true_label == 0) {
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label l_true = text_label();
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label l_false = text_label();
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label l_maybe = text_label();
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label l_end = text_label();
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struct desig Des;
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Des = InitDesig;
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CodeExpr(leftop, &Des, l_true, l_maybe);
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C_df_ilb(l_maybe);
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Des = InitDesig;
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CodeExpr(rightop, &Des, l_true, l_false);
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C_df_ilb(l_false);
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C_loc((arith)0);
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C_bra(l_end);
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C_df_ilb(l_true);
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C_loc((arith)1);
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C_df_ilb(l_end);
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}
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else {
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label l_maybe = text_label();
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struct desig Des;
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Des = InitDesig;
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CodeExpr(leftop, &Des, true_label, l_maybe);
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C_df_ilb(l_maybe);
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Des = InitDesig;
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CodeExpr(rightop, &Des, true_label, false_label);
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}
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break;
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default:
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crash("(CodeOper) Bad operator %s\n", symbol2str(oper));
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}
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}
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/* compare() serves as an auxiliary function of CodeOper */
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compare(relop, lbl)
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int relop;
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label lbl;
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{
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switch (relop) {
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case '<':
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C_zlt(lbl);
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break;
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case LESSEQUAL:
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C_zle(lbl);
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break;
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case '>':
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C_zgt(lbl);
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break;
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case GREATEREQUAL:
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C_zge(lbl);
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break;
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case '=':
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C_zeq(lbl);
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break;
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case UNEQUAL:
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case '#':
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C_zne(lbl);
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break;
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default:
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crash("(compare)");
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}
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}
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/* truthvalue() serves as an auxiliary function of CodeOper */
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truthvalue(relop)
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int relop;
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{
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switch (relop) {
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case '<':
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C_tlt();
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break;
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case LESSEQUAL:
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C_tle();
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break;
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case '>':
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C_tgt();
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break;
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case GREATEREQUAL:
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C_tge();
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break;
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case '=':
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C_teq();
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break;
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case UNEQUAL:
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case '#':
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C_tne();
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break;
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default:
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crash("(truthvalue)");
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}
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}
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CodeUoper(nd)
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|
register struct node *nd;
|
|
{
|
|
register struct type *tp = nd->nd_type;
|
|
|
|
switch(nd->nd_symb) {
|
|
case '~':
|
|
case NOT:
|
|
C_teq();
|
|
break;
|
|
case '-':
|
|
switch(tp->tp_fund) {
|
|
case T_INTEGER:
|
|
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");
|
|
}
|
|
}
|