123 lines
2.2 KiB
C
123 lines
2.2 KiB
C
/* T E M P O R A R Y V A R I A B L E S */
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/* Code for the allocation and de-allocation of temporary variables,
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allowing re-use.
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The routines use "ProcScope" instead of "CurrentScope", because
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"CurrentScope" also reflects WITH statements, and these scopes do not
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have local variabes.
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*/
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#include "debug.h"
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#include <em_arith.h>
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#include <em_label.h>
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#include <em_reg.h>
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#include <alloc.h>
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#include <assert.h>
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#include "def.h"
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#include "type.h"
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#include "scope.h"
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#include "main.h"
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struct tmpvar {
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struct tmpvar *next;
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arith t_offset; /* offset from LocalBase */
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};
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/* STATICALLOCDEF "tmpvar" 10 */
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static struct tmpvar *TmpInts, /* for integer temporaries */
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*TmpPtrs; /* for pointer temporaries */
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static struct scope *ProcScope; /* scope of procedure in which the
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temporaries are allocated
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*/
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TmpOpen(sc) struct scope *sc;
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{
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/* Initialize for temporaries in scope "sc".
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*/
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ProcScope = sc;
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}
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arith
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NewInt()
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{
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register arith offset;
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register struct tmpvar *tmp;
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if (!TmpInts) {
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offset = - WA(align(int_size - ProcScope->sc_off, int_align));
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ProcScope->sc_off = offset;
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if (! options['n']) C_ms_reg(offset, int_size, reg_any, 0);
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}
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else {
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tmp = TmpInts;
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offset = tmp->t_offset;
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TmpInts = tmp->next;
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free_tmpvar(tmp);
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}
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return offset;
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}
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arith
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NewPtr()
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{
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register arith offset;
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register struct tmpvar *tmp;
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if (!TmpPtrs) {
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offset = - WA(align(pointer_size - ProcScope->sc_off, pointer_align));
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ProcScope->sc_off = offset;
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if (! options['n']) C_ms_reg(offset, pointer_size, reg_pointer, 0);
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}
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else {
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tmp = TmpPtrs;
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offset = tmp->t_offset;
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TmpPtrs = tmp->next;
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free_tmpvar(tmp);
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}
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return offset;
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}
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FreeInt(off)
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arith off;
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{
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register struct tmpvar *tmp;
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tmp = new_tmpvar();
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tmp->next = TmpInts;
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tmp->t_offset = off;
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TmpInts = tmp;
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}
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FreePtr(off)
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arith off;
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{
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register struct tmpvar *tmp;
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tmp = new_tmpvar();
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tmp->next = TmpPtrs;
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tmp->t_offset = off;
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TmpPtrs = tmp;
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}
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TmpClose()
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{
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register struct tmpvar *tmp, *tmp1;
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tmp = TmpInts;
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while (tmp) {
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tmp1 = tmp;
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tmp = tmp->next;
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free_tmpvar(tmp1);
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}
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tmp = TmpPtrs;
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while (tmp) {
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tmp1 = tmp;
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tmp = tmp->next;
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free_tmpvar(tmp1);
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}
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TmpInts = TmpPtrs = 0;
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}
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