1023 lines
22 KiB
C
1023 lines
22 KiB
C
/* $Header$ */
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/* EXPRESSION-CODE GENERATOR */
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/* main functions :
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EVAL() -- expression tree evaluator
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tmp_pointer_var() -- deliver temporary pointer variable
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free_tmp_var() -- return the pointer var
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store_val() -- store primary expression
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load_val() -- load primary expression
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auxiliary functions:
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assop()
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compare()
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*/
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#include "debug.h"
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#include "nobitfield.h"
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#include "string.h"
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#include "dataflow.h"
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#include "arith.h"
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#include "type.h"
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#include "idf.h"
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#include "label.h"
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#include "code.h"
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#include "assert.h"
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#include "def.h"
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#include "expr.h"
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#include "sizes.h"
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#include "Lpars.h"
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#include "level.h"
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#include "stack.h"
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#include "align.h"
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#include "mes.h"
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#include "atw.h"
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#include "em.h"
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#define CRASH() crash("EVAL: CRASH at line %u", __LINE__)
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#define roundup(n) ((n) < word_size ? word_size : (n))
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char *symbol2str();
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arith tmp_pointer_var();
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/* EVAL() serves as the main expression tree evaluator, which turns
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any legal expression tree into legal EM code.
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The parameters describe how EVAL should treat the expression tree:
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struct expr *expr: pointer to root of the expression tree to
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be evaluated
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int val: indicates whether the resulting expression
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is to be dereferenced (if val == RVAL and
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expr->ex_lvalue == 1) or not (val == LVAL).
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The latter case indicates that the resulting
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expression is an lvalue expression which should
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not be dereferenced by EVAL
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int code: indicates whether the expression tree must be
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turned into EM code or not. E.g. the expression
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statement "12;" delivers the expression "12" to
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EVAL while this should not result in any EM code
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label false_label:
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label true_label: if the expression is a logical or relational
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expression and if the loop of the program
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depends on the resulting value then EVAL
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generates jumps to the specified program labels,
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in case they are specified (i.e. are non-zero)
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*/
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EVAL(expr, val, code, true_label, false_label)
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struct expr *expr; /* the expression tree itself */
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int val; /* either RVAL or LVAL */
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int code; /* generate explicit code or not */
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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 gencode = (code == TRUE);
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switch (expr->ex_class) {
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case Value: /* just a simple value */
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if (gencode)
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load_val(expr, val);
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break;
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case String: /* a string constant */
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if (gencode) {
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label datlab = data_label();
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C_df_dlb(datlab);
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C_con_scon(expr->SG_VALUE, (arith)0);
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C_lae_dlb(datlab, (arith)0);
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}
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break;
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case Float: /* a floating constant */
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if (gencode) {
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label datlab = data_label();
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C_df_dlb(datlab);
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C_rom_fcon(expr->FL_VALUE, expr->ex_type->tp_size);
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C_lae_dlb(datlab, (arith)0);
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C_loi(expr->ex_type->tp_size);
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}
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break;
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case Oper: /* compound expression */
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{
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register int oper = expr->OP_OPER;
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register struct expr *leftop = expr->OP_LEFT;
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register struct expr *rightop = expr->OP_RIGHT;
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register struct type *tp = expr->OP_TYPE;
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if (tp->tp_fund == ERRONEOUS) /* stop immediately */
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break;
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switch (oper) {
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case '+':
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/* We have the following possibilities :
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int + int, pointer + int, pointer + long,
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long + long, double + double
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*/
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EVAL(leftop, RVAL, code, NO_LABEL, NO_LABEL);
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EVAL(rightop, RVAL, code, NO_LABEL, NO_LABEL);
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if (gencode) {
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switch (tp->tp_fund) {
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case INT:
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case LONG:
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if (tp->tp_unsigned)
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C_adu(tp->tp_size);
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else
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C_adi(tp->tp_size);
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break;
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case POINTER:
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C_ads(rightop->ex_type->tp_size);
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break;
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case DOUBLE:
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C_adf(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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}
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break;
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case '-':
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if (leftop == 0) { /* unary */
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EVAL(rightop, RVAL, code, NO_LABEL, NO_LABEL);
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if (gencode) {
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switch (tp->tp_fund) {
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case DOUBLE:
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C_ngf(tp->tp_size);
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break;
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case INT:
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case LONG:
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case POINTER:
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C_ngi(tp->tp_size);
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break;
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default:
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CRASH();
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}
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}
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break;
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}
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/* Binary: we have the following flavours:
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int - int, pointer - int, pointer - long,
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pointer - pointer, long - long, double - double
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*/
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EVAL(leftop, RVAL, code, NO_LABEL, NO_LABEL);
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EVAL(rightop, RVAL, code, NO_LABEL, NO_LABEL);
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if (!gencode)
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break;
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switch (tp->tp_fund) {
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case INT:
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case LONG:
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if (tp->tp_unsigned)
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C_sbu(tp->tp_size);
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else
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C_sbi(tp->tp_size);
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break;
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case POINTER:
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if (rightop->ex_type->tp_fund == POINTER)
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C_sbs(pointer_size);
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else {
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C_ngi(rightop->ex_type->tp_size);
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C_ads(rightop->ex_type->tp_size);
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}
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break;
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case DOUBLE:
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C_sbf(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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if (leftop == 0) /* unary */
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EVAL(rightop, RVAL, code, NO_LABEL, NO_LABEL);
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else { /* binary */
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EVAL(leftop, RVAL, code, NO_LABEL, NO_LABEL);
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EVAL(rightop, RVAL, code, NO_LABEL, NO_LABEL);
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if (gencode)
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switch (tp->tp_fund) {
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case INT:
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case LONG:
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case POINTER:
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if (tp->tp_unsigned)
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C_mlu(tp->tp_size);
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else
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C_mli(tp->tp_size);
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break;
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case DOUBLE:
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C_mlf(double_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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}
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break;
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case '/':
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EVAL(leftop, RVAL, code, NO_LABEL, NO_LABEL);
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EVAL(rightop, RVAL, code, NO_LABEL, NO_LABEL);
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if (gencode)
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switch (tp->tp_fund) {
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case INT:
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case LONG:
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case POINTER:
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if (tp->tp_unsigned)
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C_dvu(tp->tp_size);
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else
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C_dvi(tp->tp_size);
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break;
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case DOUBLE:
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C_dvf(double_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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EVAL(leftop, RVAL, code, NO_LABEL, NO_LABEL);
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EVAL(rightop, RVAL, code, NO_LABEL, NO_LABEL);
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if (gencode)
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if (tp->tp_fund == INT || tp->tp_fund == LONG) {
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if (tp->tp_unsigned)
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C_rmu(tp->tp_size);
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else
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C_rmi(tp->tp_size);
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}
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else
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crash("bad type %%");
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break;
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case LEFT:
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EVAL(leftop, RVAL, code, NO_LABEL, NO_LABEL);
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EVAL(rightop, RVAL, code, NO_LABEL, NO_LABEL);
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if (gencode)
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if (tp->tp_unsigned)
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C_slu(tp->tp_size);
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else
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C_sli(tp->tp_size);
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break;
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case RIGHT:
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EVAL(leftop, RVAL, code, NO_LABEL, NO_LABEL);
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EVAL(rightop, RVAL, code, NO_LABEL, NO_LABEL);
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if (gencode)
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if (tp->tp_unsigned)
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C_sru(tp->tp_size);
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else
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C_sri(tp->tp_size);
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break;
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case '<':
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case LESSEQ:
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case '>':
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case GREATEREQ:
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case EQUAL:
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case NOTEQUAL:
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EVAL(leftop, RVAL, code, NO_LABEL, NO_LABEL);
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EVAL(rightop, RVAL, code, NO_LABEL, NO_LABEL);
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if (gencode) {
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/* The operands have the same type */
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switch (tp->tp_fund) {
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case INT:
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case LONG:
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if (leftop->ex_type->tp_unsigned)
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C_cmu(leftop->ex_type->tp_size);
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else
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C_cmi(leftop->ex_type->tp_size);
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break;
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case FLOAT:
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case DOUBLE:
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C_cmf(leftop->ex_type->tp_size);
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break;
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case POINTER:
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C_cmp();
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break;
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case ENUM:
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C_cmi(leftop->ex_type->tp_size);
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break;
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default:
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CRASH();
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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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label l_true = text_label();
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label l_end = text_label();
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compare(oper, l_true);
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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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}
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break;
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case '&':
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case '|':
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case '^':
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/* both operands should have type int */
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EVAL(leftop, RVAL, code, NO_LABEL, NO_LABEL);
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EVAL(rightop, RVAL, code, NO_LABEL, NO_LABEL);
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if (gencode) {
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arith size = tp->tp_size;
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if (size < word_size)
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size = word_size;
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switch (oper) {
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case '&':
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C_and(size);
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break;
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case '|':
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C_ior(size);
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break;
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case '^':
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C_xor(size);
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break;
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}
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}
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break;
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case '=':
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#ifndef NOBITFIELD
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if (leftop->ex_type->tp_fund == FIELD) {
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/* assignment to bitfield variable
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*/
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eval_field(expr, code);
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break;
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}
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#endif NOBITFIELD
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EVAL(rightop, RVAL, TRUE, NO_LABEL, NO_LABEL);
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if (gencode)
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C_dup(ATW(tp->tp_size));
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if (leftop->ex_class != Value) {
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EVAL(leftop, LVAL, TRUE, NO_LABEL, NO_LABEL);
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store_block(tp->tp_size, tp->tp_align);
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}
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else
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store_val(leftop->VL_IDF, leftop->ex_type,
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leftop->VL_VALUE);
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break;
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case PLUSAB:
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case MINAB:
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case TIMESAB:
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case DIVAB:
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case MODAB:
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case LEFTAB:
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case RIGHTAB:
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case ANDAB:
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case XORAB:
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case ORAB:
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#ifndef NOBITFIELD
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if (leftop->ex_type->tp_fund == FIELD) {
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eval_field(expr, code);
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break;
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}
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#endif NOBITFIELD
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if (leftop->ex_class != Value) {
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arith old_offset;
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arith tmpvar = tmp_pointer_var(&old_offset);
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EVAL(leftop, LVAL, TRUE, NO_LABEL, NO_LABEL);
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C_lal(tmpvar);
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C_sti(pointer_size);
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C_lal(tmpvar);
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C_loi(pointer_size);
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C_loi(tp->tp_size);
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EVAL(rightop, RVAL, TRUE, NO_LABEL, NO_LABEL);
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assop(tp, oper);
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if (gencode)
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C_dup(roundup(tp->tp_size));
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C_lal(tmpvar);
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C_loi(pointer_size);
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C_sti(tp->tp_size);
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free_tmp_var(old_offset);
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}
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else {
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load_val(leftop, RVAL);
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EVAL(rightop, RVAL, TRUE, NO_LABEL, NO_LABEL);
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assop(tp, oper);
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if (gencode)
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C_dup(roundup(tp->tp_size));
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store_val(leftop->VL_IDF, leftop->ex_type,
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leftop->VL_VALUE);
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}
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break;
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case '(':
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{
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register struct expr *expr;
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arith ParSize = (arith)0;
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if (expr = rightop) {
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/* function call with parameters*/
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while ( expr->ex_class == Oper &&
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expr->OP_OPER == PARCOMMA
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) {
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EVAL(expr->OP_RIGHT, RVAL, TRUE,
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NO_LABEL, NO_LABEL);
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ParSize +=
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ATW(expr->ex_type->tp_size);
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expr = expr->OP_LEFT;
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}
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EVAL(expr, RVAL, TRUE, NO_LABEL, NO_LABEL);
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ParSize += ATW(expr->ex_type->tp_size);
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}
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if (leftop->ex_class == Value && leftop->VL_IDF != 0) {
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/* just an example:
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main() { (*((int (*)())0))(); }
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*/
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C_cal(leftop->VL_IDF->id_text);
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#ifdef DATAFLOW
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{ extern char options[];
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if (options['d'])
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DfaCallFunction(
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leftop->VL_IDF->id_text
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);
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}
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#endif DATAFLOW
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}
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else {
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EVAL(leftop, LVAL, TRUE, NO_LABEL, NO_LABEL);
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C_cai();
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}
|
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/* remove parameters from stack */
|
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if (ParSize > (arith)0)
|
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C_asp(ParSize);
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if (!gencode)
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break;
|
|
if (is_struct_or_union(tp->tp_fund)) {
|
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C_lfr(pointer_size);
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load_block(tp->tp_size, tp->tp_align);
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}
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else
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C_lfr(ATW(tp->tp_size));
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break;
|
|
}
|
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case '.':
|
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EVAL(leftop, LVAL, code, NO_LABEL, NO_LABEL);
|
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if (gencode)
|
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C_adp(rightop->VL_VALUE);
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break;
|
|
case ARROW:
|
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EVAL(leftop, RVAL, code, NO_LABEL, NO_LABEL);
|
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if (gencode)
|
|
C_adp(rightop->VL_VALUE);
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break;
|
|
case ',':
|
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EVAL(leftop, RVAL, FALSE, NO_LABEL, NO_LABEL);
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EVAL(rightop, RVAL, code, NO_LABEL, NO_LABEL);
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break;
|
|
case '~':
|
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EVAL(rightop, RVAL, code, NO_LABEL, NO_LABEL);
|
|
if (gencode)
|
|
C_com(tp->tp_size);
|
|
break;
|
|
case POSTINCR:
|
|
case POSTDECR:
|
|
case PLUSPLUS:
|
|
case MINMIN:
|
|
{
|
|
arith old_offset, tmp;
|
|
arith esize = tp->tp_size;
|
|
#ifndef NOBITFIELD
|
|
if (leftop->ex_type->tp_fund == FIELD) {
|
|
eval_field(expr, code);
|
|
break;
|
|
}
|
|
#endif NOBITFIELD
|
|
if (leftop->ex_class != Value) {
|
|
tmp = tmp_pointer_var(&old_offset);
|
|
EVAL(leftop, LVAL, TRUE, NO_LABEL, NO_LABEL);
|
|
C_dup(pointer_size);
|
|
C_lal(tmp);
|
|
C_sti(pointer_size);
|
|
C_loi(tp->tp_size);
|
|
}
|
|
else
|
|
load_val(leftop, RVAL);
|
|
|
|
/* We made the choice to put this stuff here
|
|
and not to put the conversion in the expression
|
|
tree because this conversion is EM dependent
|
|
and not described in C
|
|
*/
|
|
if (esize < word_size) {
|
|
conversion(tp, word_type);
|
|
esize = word_size;
|
|
}
|
|
|
|
if (gencode && (oper == POSTINCR || oper == POSTDECR))
|
|
C_dup(esize);
|
|
EVAL(rightop, RVAL, TRUE, NO_LABEL, NO_LABEL);
|
|
assop(tp, oper);
|
|
if (gencode && (oper == PLUSPLUS || oper == MINMIN))
|
|
C_dup(esize);
|
|
if (tp->tp_size < word_size)
|
|
conversion(word_type, tp);
|
|
if (leftop->ex_class != Value) {
|
|
C_lal(tmp); /* always init'd */
|
|
C_loi(pointer_size);
|
|
C_sti(tp->tp_size);
|
|
free_tmp_var(old_offset);
|
|
}
|
|
else
|
|
store_val(leftop->VL_IDF, leftop->ex_type,
|
|
leftop->VL_VALUE);
|
|
break;
|
|
}
|
|
case '?': /* must be followed by ':' */
|
|
{
|
|
label l_true = text_label();
|
|
label l_false = text_label();
|
|
label l_end = text_label();
|
|
|
|
EVAL(leftop, RVAL, TRUE, l_true, l_false);
|
|
C_df_ilb(l_true);
|
|
EVAL(rightop->OP_LEFT, RVAL, code, NO_LABEL, NO_LABEL);
|
|
C_bra(l_end);
|
|
C_df_ilb(l_false);
|
|
EVAL(rightop->OP_RIGHT, RVAL, code, NO_LABEL, NO_LABEL);
|
|
C_df_ilb(l_end);
|
|
break;
|
|
}
|
|
case AND:
|
|
if (true_label == 0) {
|
|
label l_true = text_label();
|
|
label l_false = text_label();
|
|
label l_maybe = text_label();
|
|
label l_end = text_label();
|
|
|
|
EVAL(leftop, RVAL, TRUE, l_maybe, l_false);
|
|
C_df_ilb(l_maybe);
|
|
if (gencode) {
|
|
EVAL(rightop, RVAL, TRUE,
|
|
l_true, l_false);
|
|
C_df_ilb(l_true);
|
|
C_loc((arith)1);
|
|
C_bra(l_end);
|
|
C_df_ilb(l_false);
|
|
C_loc((arith)0);
|
|
C_df_ilb(l_end);
|
|
}
|
|
else {
|
|
EVAL(rightop, RVAL, FALSE, l_false,
|
|
l_false);
|
|
C_df_ilb(l_false);
|
|
}
|
|
}
|
|
else {
|
|
label l_maybe = text_label();
|
|
|
|
EVAL(leftop, RVAL, TRUE, l_maybe, false_label);
|
|
C_df_ilb(l_maybe);
|
|
EVAL(rightop, RVAL, code, true_label,
|
|
false_label);
|
|
}
|
|
break;
|
|
case OR:
|
|
if (true_label == 0) {
|
|
label l_true = text_label();
|
|
label l_false = text_label();
|
|
label l_maybe = text_label();
|
|
label l_end = text_label();
|
|
|
|
EVAL(leftop, RVAL, TRUE, l_true, l_maybe);
|
|
C_df_ilb(l_maybe);
|
|
if (gencode) {
|
|
EVAL(rightop, RVAL, TRUE,
|
|
l_true, l_false);
|
|
C_df_ilb(l_false);
|
|
C_loc((arith)0);
|
|
C_bra(l_end);
|
|
C_df_ilb(l_true);
|
|
C_loc((arith)1);
|
|
C_df_ilb(l_end);
|
|
}
|
|
else {
|
|
EVAL(rightop, RVAL, FALSE, l_true,
|
|
l_true);
|
|
C_df_ilb(l_true);
|
|
}
|
|
}
|
|
else {
|
|
label l_maybe = text_label();
|
|
|
|
EVAL(leftop, RVAL, TRUE, true_label, l_maybe);
|
|
C_df_ilb(l_maybe);
|
|
EVAL(rightop, RVAL, code, true_label,
|
|
false_label);
|
|
}
|
|
break;
|
|
case '!':
|
|
if (true_label == 0) {
|
|
if (gencode) {
|
|
label l_true = text_label();
|
|
label l_false = text_label();
|
|
label l_end = text_label();
|
|
|
|
EVAL(rightop, RVAL, TRUE,
|
|
l_false, l_true);
|
|
C_df_ilb(l_false);
|
|
C_loc((arith)0);
|
|
C_bra(l_end);
|
|
C_df_ilb(l_true);
|
|
C_loc((arith)1);
|
|
C_df_ilb(l_end);
|
|
}
|
|
else
|
|
EVAL(rightop, RVAL, FALSE,
|
|
NO_LABEL, NO_LABEL);
|
|
}
|
|
else
|
|
EVAL(rightop, RVAL, code, false_label,
|
|
true_label);
|
|
break;
|
|
case INT2INT:
|
|
case INT2FLOAT:
|
|
case FLOAT2INT:
|
|
case FLOAT2FLOAT:
|
|
EVAL(rightop, RVAL, code, NO_LABEL, NO_LABEL);
|
|
if (gencode)
|
|
conversion(rightop->ex_type, leftop->ex_type);
|
|
break;
|
|
default:
|
|
crash("(EVAL) bad operator %s\n", symbol2str(oper));
|
|
}
|
|
|
|
/* If the rvalue of the expression is required but
|
|
only its lvalue is evaluated, its rvalue is
|
|
loaded by the following statements:
|
|
*/
|
|
if (gencode && val == RVAL && expr->ex_lvalue == 1)
|
|
load_block(expr->ex_type->tp_size,
|
|
expr->ex_type->tp_align);
|
|
break;
|
|
}
|
|
case Type:
|
|
default:
|
|
crash("(EVAL) bad expression class");
|
|
}
|
|
}
|
|
|
|
/* compare() serves as an auxiliary function of EVAL */
|
|
compare(relop, lbl)
|
|
int relop;
|
|
label lbl;
|
|
{
|
|
switch (relop) {
|
|
case '<':
|
|
C_zlt(lbl);
|
|
break;
|
|
case LESSEQ:
|
|
C_zle(lbl);
|
|
break;
|
|
case '>':
|
|
C_zgt(lbl);
|
|
break;
|
|
case GREATEREQ:
|
|
C_zge(lbl);
|
|
break;
|
|
case EQUAL:
|
|
C_zeq(lbl);
|
|
break;
|
|
case NOTEQUAL:
|
|
C_zne(lbl);
|
|
break;
|
|
default:
|
|
CRASH();
|
|
}
|
|
}
|
|
|
|
/* assop() generates the opcode of an assignment operators op= */
|
|
assop(type, oper)
|
|
struct type *type;
|
|
int oper;
|
|
{
|
|
register arith size = type->tp_size;
|
|
register uns = type->tp_unsigned;
|
|
|
|
if (size < word_size)
|
|
size = word_size;
|
|
switch (type->tp_fund) {
|
|
case CHAR:
|
|
case SHORT:
|
|
case INT:
|
|
case LONG:
|
|
case ENUM:
|
|
switch (oper) {
|
|
case PLUSAB:
|
|
case PLUSPLUS:
|
|
case POSTINCR:
|
|
if (uns)
|
|
C_adu(size);
|
|
else
|
|
C_adi(size);
|
|
break;
|
|
case MINAB:
|
|
case MINMIN:
|
|
case POSTDECR:
|
|
if (uns)
|
|
C_sbu(size);
|
|
else
|
|
C_sbi(size);
|
|
break;
|
|
case TIMESAB:
|
|
if (uns)
|
|
C_mlu(size);
|
|
else
|
|
C_mli(size);
|
|
break;
|
|
case DIVAB:
|
|
if (uns)
|
|
C_dvu(size);
|
|
else
|
|
C_dvi(size);
|
|
break;
|
|
case MODAB:
|
|
if (uns)
|
|
C_rmu(size);
|
|
else
|
|
C_rmi(size);
|
|
break;
|
|
case LEFTAB:
|
|
if (uns)
|
|
C_slu(size);
|
|
else
|
|
C_sli(size);
|
|
break;
|
|
case RIGHTAB:
|
|
if (uns)
|
|
C_sru(size);
|
|
else
|
|
C_sri(size);
|
|
break;
|
|
case ANDAB:
|
|
C_and(size);
|
|
break;
|
|
case XORAB:
|
|
C_xor(size);
|
|
break;
|
|
case ORAB:
|
|
C_ior(size);
|
|
break;
|
|
}
|
|
break;
|
|
case FLOAT:
|
|
case DOUBLE:
|
|
switch (oper) {
|
|
case PLUSAB:
|
|
case PLUSPLUS:
|
|
case POSTINCR:
|
|
C_adf(size);
|
|
break;
|
|
case MINAB:
|
|
case MINMIN:
|
|
case POSTDECR:
|
|
C_sbf(size);
|
|
break;
|
|
case TIMESAB:
|
|
C_mlf(size);
|
|
break;
|
|
case DIVAB:
|
|
C_dvf(size);
|
|
break;
|
|
}
|
|
break;
|
|
case POINTER:
|
|
if (oper == MINAB || oper == MINMIN || oper == POSTDECR)
|
|
C_ngi(size);
|
|
C_ads(size);
|
|
break;
|
|
case ERRONEOUS:
|
|
break;
|
|
default:
|
|
crash("(assop) bad type %s\n", symbol2str(type->tp_fund));
|
|
}
|
|
}
|
|
|
|
/* tmp_pointer_var() returns the EM address of a new temporary
|
|
pointer variable needed at increment, decrement and assignment
|
|
operations to store the address of some variable or lvalue-expression.
|
|
*/
|
|
arith
|
|
tmp_pointer_var(oldoffset)
|
|
arith *oldoffset; /* previous allocated address */
|
|
{
|
|
struct stack_level *stl = local_level;
|
|
|
|
*oldoffset = stl->sl_local_offset;
|
|
stl->sl_local_offset =
|
|
- align(-stl->sl_local_offset + pointer_size, pointer_align);
|
|
if (stl->sl_local_offset < stl->sl_max_block)
|
|
stl->sl_max_block = stl->sl_local_offset;
|
|
return stl->sl_local_offset;
|
|
}
|
|
|
|
/* free_tmp_var() returns the address allocated by tmp_pointer_var()
|
|
and resets the last allocated address.
|
|
*/
|
|
free_tmp_var(oldoffset)
|
|
arith oldoffset;
|
|
{
|
|
local_level->sl_local_offset = oldoffset;
|
|
}
|
|
|
|
/* store_val() generates code for a store operation.
|
|
There are four ways of storing data:
|
|
- into a global variable
|
|
- into an automatic local variable
|
|
- into a local static variable
|
|
- absolute addressing
|
|
When the destination is described by an (lvalue) expression, the call
|
|
is "store_val(ex->VL_IDF, ex->ex_type, ex->VL_VALUE)"
|
|
*/
|
|
store_val(id, tp, offs)
|
|
register struct idf *id;
|
|
struct type *tp;
|
|
arith offs;
|
|
{
|
|
arith size = tp->tp_size;
|
|
int tpalign = tp->tp_align;
|
|
|
|
if (id) {
|
|
register struct def *df = id->id_def;
|
|
int al_on_word = (tpalign % word_align == 0);
|
|
register inword = (size == word_size && al_on_word);
|
|
register indword = (size == dword_size && al_on_word);
|
|
|
|
if (df->df_level == L_GLOBAL) {
|
|
if (inword)
|
|
C_ste_dnam(id->id_text, offs);
|
|
else
|
|
if (indword)
|
|
C_sde_dnam(id->id_text, offs);
|
|
else {
|
|
C_lae_dnam(id->id_text, offs);
|
|
store_block(size, tpalign);
|
|
}
|
|
}
|
|
else
|
|
if (df->df_sc == STATIC) {
|
|
if (inword)
|
|
C_ste_dlb((label)df->df_address, offs);
|
|
else
|
|
if (indword)
|
|
C_sde_dlb((label)df->df_address, offs);
|
|
else {
|
|
C_lae_dlb((label)df->df_address, offs);
|
|
store_block(size, tpalign);
|
|
}
|
|
}
|
|
else {
|
|
if (inword)
|
|
C_stl(df->df_address + offs);
|
|
else
|
|
if (indword)
|
|
C_sdl(df->df_address + offs);
|
|
else {
|
|
C_lal(df->df_address + offs);
|
|
store_block(size, tpalign);
|
|
df->df_register = REG_NONE;
|
|
}
|
|
}
|
|
}
|
|
else { /* absolute addressing */
|
|
load_cst(offs, pointer_size);
|
|
store_block(size, tpalign);
|
|
}
|
|
}
|
|
|
|
|
|
/* load_val() generates code for stacking a certain value (from ex),
|
|
which can be obtained in one of the following ways:
|
|
- value from absolute addressed memory
|
|
- constant value
|
|
- function result
|
|
- global variable
|
|
- static variable
|
|
- local variable
|
|
*/
|
|
load_val(expr, val)
|
|
struct expr *expr; /* expression containing the value */
|
|
int val; /* generate either LVAL or RVAL */
|
|
{
|
|
register struct idf *id;
|
|
register struct type *tp = expr->ex_type;
|
|
register struct def *df;
|
|
register rvalue = (val == RVAL && expr->ex_lvalue != 0);
|
|
register arith exval = expr->VL_VALUE;
|
|
register arith size = tp->tp_size;
|
|
register tpalign = tp->tp_align;
|
|
register al_on_word = (tpalign % word_align == 0);
|
|
|
|
if ((id = expr->VL_IDF) == 0) {
|
|
/* Note: enum constants are also dealt with here */
|
|
if (rvalue) {
|
|
/* absolute addressing
|
|
*/
|
|
load_cst(exval, pointer_size);
|
|
load_block(size, tpalign);
|
|
}
|
|
else /* integer, unsigned, long, enum etc */
|
|
load_cst(exval, size);
|
|
}
|
|
else
|
|
if ((df = id->id_def)->df_type->tp_fund == FUNCTION)
|
|
/* the previous statement tried to catch a function
|
|
identifier, which may be cast to a pointer to a
|
|
function.
|
|
ASSERT(!(rvalue)); ???
|
|
*/
|
|
C_lpi(id->id_text);
|
|
else
|
|
if (df->df_level == L_GLOBAL) {
|
|
if (rvalue) {
|
|
if (size == word_size && al_on_word)
|
|
C_loe_dnam(id->id_text, exval);
|
|
else
|
|
if (size == dword_size && al_on_word)
|
|
C_lde_dnam(id->id_text, exval);
|
|
else {
|
|
C_lae_dnam(id->id_text, exval);
|
|
load_block(size, tpalign);
|
|
}
|
|
|
|
}
|
|
else {
|
|
C_lae_dnam(id->id_text, (arith)0);
|
|
C_adp(exval);
|
|
}
|
|
}
|
|
else
|
|
if (df->df_sc == STATIC) {
|
|
if (rvalue) {
|
|
if (size == word_size && al_on_word)
|
|
C_loe_dlb((label)df->df_address, exval);
|
|
else
|
|
if (size == dword_size && al_on_word)
|
|
C_lde_dlb((label)df->df_address, exval);
|
|
else {
|
|
C_lae_dlb((label)df->df_address, exval);
|
|
load_block(size, tpalign);
|
|
}
|
|
|
|
}
|
|
else {
|
|
C_lae_dlb((label)df->df_address, (arith)0);
|
|
C_adp(exval);
|
|
}
|
|
}
|
|
else {
|
|
if (rvalue) {
|
|
if (size == word_size && al_on_word)
|
|
C_lol(df->df_address + exval);
|
|
else
|
|
if (size == dword_size && al_on_word)
|
|
C_ldl(df->df_address + exval);
|
|
else {
|
|
C_lal(df->df_address + exval);
|
|
load_block(size, tpalign);
|
|
df->df_register = REG_NONE;
|
|
}
|
|
}
|
|
else {
|
|
/* following code may be used when
|
|
comparing addresses as in the following
|
|
example:
|
|
f() {
|
|
int a[10], *i;
|
|
for (i = &a[0]; i < &a[10]; i++) ...;
|
|
}
|
|
We don't accept the contents of a[10] to
|
|
be legitimate, so the RVAL of it may
|
|
contain a big mess.
|
|
*/
|
|
C_lal(df->df_address);
|
|
C_adp(exval);
|
|
df->df_register = REG_NONE;
|
|
}
|
|
}
|
|
}
|
|
|
|
load_cst(val, siz)
|
|
arith val, siz;
|
|
{
|
|
if (siz <= word_size)
|
|
C_loc(val);
|
|
else
|
|
if (siz == dword_size)
|
|
C_ldc(val);
|
|
else {
|
|
label datlab;
|
|
|
|
C_df_dlb(datlab = data_label());
|
|
C_rom_icon(itos(val), siz);
|
|
C_lae_dlb(datlab, (arith)0);
|
|
C_loi(siz);
|
|
}
|
|
}
|