84 lines
1.4 KiB
C
84 lines
1.4 KiB
C
/*
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AB_list[s] holds the actual base of stack frame s; this
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is the highest stack pointer of frame s-1.
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Segments have the following numbers:
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-2 DATA_SEGMENT
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-1 HEAP_SEGMENT
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0, 1, .., curr_frame stackframes
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Note that AB_list[s] increases for decreasing s.
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*/
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/* $Id$ */
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#include "segcheck.h"
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#include "segment.h"
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#include "global.h"
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#include "mem.h"
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#include "alloc.h"
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#ifdef SEGCHECK
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#define ABLISTSIZE 100L /* initial AB_list size */
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#define DATA_SEGMENT -2
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#define HEAP_SEGMENT -1
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PRIVATE ptr *AB_list;
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PRIVATE size frame_limit;
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PRIVATE size curr_frame;
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/** Allocate space for AB_list & initialize frame variables */
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void init_AB_list(void)
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{
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frame_limit = ABLISTSIZE;
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curr_frame = 0L;
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AB_list = (ptr *) Malloc(frame_limit * sizeof (ptr), "AB_list");
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AB_list[curr_frame] = AB;
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}
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void push_frame(ptr p)
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{
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if (++curr_frame == frame_limit) {
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frame_limit = allocfrac(frame_limit);
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AB_list = (ptr *) Realloc((char *) AB_list,
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frame_limit * sizeof (ptr), "AB_list");
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}
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AB_list[curr_frame] = p;
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}
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void pop_frames(void)
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{
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while (AB_list[curr_frame] < AB) {
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curr_frame--;
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}
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}
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int ptr2seg(ptr p)
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{
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register int s;
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if (in_gda(p)) {
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s = DATA_SEGMENT;
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}
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else if (!in_stack(p)) {
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s = HEAP_SEGMENT;
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}
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else {
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for (s = curr_frame; s > 0; s--) {
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if (AB_list[s] > p)
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break;
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}
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}
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return s;
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}
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#else /* SEGCHECK */
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void init_AB_list(void) {}
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void push_frame(ptr) {}
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void pop_frames(void) {}
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#endif /* SEGCHECK */
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