161 lines
3.3 KiB
C
161 lines
3.3 KiB
C
/* $Header$ */
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#include <alloc.h>
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#include "position.h"
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#include "scope.h"
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#include "symbol.h"
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#include "type.h"
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#include "message.h"
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int stack_offset; /* for up and down commands */
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extern long pointer_size;
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extern t_addr *get_EM_regs();
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extern char *memcpy();
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/* Get the value of the symbol indicated by sym.
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Return 0 on failure,
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1 on success.
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On success, 'buf' contains the value, and 'size' contains the size.
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For 'buf', storage is allocated by Malloc; this storage must
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be freed by caller (I don't like this any more than you do, but caller
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does not know sizes).
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*/
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int
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get_value(sym, buf, psize)
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register p_symbol sym;
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char **buf;
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long *psize;
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{
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p_type tp = sym->sy_type;
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long size = tp->ty_size;
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int retval = 0;
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t_addr *EM_regs;
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int i;
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p_scope sc, symsc;
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char *AB;
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*buf = 0;
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switch(sym->sy_class) {
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case VAR:
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/* exists if child exists; nm_value contains addres */
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*buf = Malloc((unsigned) size);
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if (get_bytes(size, (t_addr) sym->sy_name.nm_value, *buf)) {
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retval = 1;
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}
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break;
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case CONST:
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*buf = Malloc((unsigned) size);
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switch(tp->ty_class) {
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case T_REAL:
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if (size != sizeof(double)) {
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*((float *) *buf) = sym->sy_const.co_rval;
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}
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else *((double *) *buf) = sym->sy_const.co_rval;
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break;
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case T_INTEGER:
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case T_SUBRANGE:
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case T_UNSIGNED:
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case T_ENUM:
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if (size == 1) {
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*((char *) *buf) = sym->sy_const.co_ival;
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}
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else if (size == 2) {
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*((short *) *buf) = sym->sy_const.co_ival;
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}
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else {
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*((long *) *buf) = sym->sy_const.co_ival;
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}
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break;
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case T_SET:
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memcpy(*buf, sym->sy_const.co_setval, (int) size);
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break;
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case T_STRING:
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memcpy(*buf, sym->sy_const.co_sval, (int) size);
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break;
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default:
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fatal("strange constant");
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}
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retval = 1;
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break;
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case VARPAR:
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case LOCVAR:
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/* first find the stack frame in which it resides */
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symsc = base_scope(sym->sy_scope);
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/* now symsc contains the scope where the storage for sym is
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allocated. Now find it on the stack of child.
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*/
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i = stack_offset;
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for (;;) {
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sc = 0;
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if (! (EM_regs = get_EM_regs(i++))) {
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/* no child? */
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break;
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}
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if (! EM_regs[AB_OFF]) {
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/* no more frames */
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break;
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}
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sc = base_scope(get_scope_from_addr(EM_regs[PC_OFF]));
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if (! sc || sc->sc_start > EM_regs[PC_OFF]) {
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sc = 0;
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break;
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}
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if (sc == symsc) break; /* found it */
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}
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if (! sc) break; /* not found */
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if (sym->sy_class == LOCVAR) {
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/* Either local variable or value parameter */
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*buf = Malloc((unsigned) size);
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if (get_bytes(size,
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EM_regs[sym->sy_name.nm_value < 0
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? LB_OFF
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: AB_OFF
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] +
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(t_addr) sym->sy_name.nm_value,
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*buf)) {
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retval = 1;
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}
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break;
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}
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/* If we get here, we have a var parameter. Get the parameters
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of the current procedure invocation.
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*/
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{
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p_type proctype = sc->sc_definedby->sy_type;
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size = proctype->ty_nbparams;
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if (has_static_link(sc)) size += pointer_size;
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AB = Malloc((unsigned) size);
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if (! get_bytes(size, EM_regs[AB_OFF], AB)) {
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break;
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}
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if ((size = tp->ty_size) == 0) {
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size = compute_size(tp, AB);
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}
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}
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*buf = Malloc((unsigned) size);
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if (get_bytes(size,
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(t_addr) BUFTOA(AB+sym->sy_name.nm_value),
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*buf)) {
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retval = 1;
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}
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free(AB);
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break;
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}
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if (retval == 0) {
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if (*buf) free(*buf);
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*buf = 0;
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*psize = 0;
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}
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else *psize = size;
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return retval;
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}
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