357 lines
6.5 KiB
C
357 lines
6.5 KiB
C
/* $Header$ */
|
|
/*
|
|
* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
|
|
* See the copyright notice in the ACK home directory, in the file "Copyright".
|
|
*/
|
|
|
|
/* V A L U E N U M B E R I N G M E T H O D */
|
|
|
|
#include <em_mnem.h>
|
|
#include "../share/types.h"
|
|
#include "../share/global.h"
|
|
#include "../share/debug.h"
|
|
#include "../share/aux.h"
|
|
#include "cs.h"
|
|
#include "cs_alloc.h"
|
|
#include "cs_aux.h"
|
|
#include "cs_entity.h"
|
|
#include "cs_avail.h"
|
|
#include "cs_stack.h"
|
|
#include "cs_kill.h"
|
|
#include "cs_partit.h"
|
|
#include "cs_getent.h"
|
|
|
|
STATIC push_entity(enp, lfirst)
|
|
entity_p enp;
|
|
line_p lfirst;
|
|
{
|
|
/* Build token and Push it. */
|
|
|
|
struct token tk;
|
|
|
|
tk.tk_vn = enp->en_vn;
|
|
tk.tk_size = enp->en_size;
|
|
tk.tk_lfirst = lfirst;
|
|
Push(&tk);
|
|
}
|
|
|
|
STATIC put_expensive_load(bp, lnp, lfirst, enp)
|
|
bblock_p bp;
|
|
line_p lnp, lfirst;
|
|
entity_p enp;
|
|
{
|
|
struct avail av;
|
|
occur_p ocp;
|
|
|
|
av.av_instr = INSTR(lnp);
|
|
av.av_size = enp->en_size;
|
|
av.av_operand = enp->en_vn;
|
|
|
|
ocp = newoccur(lfirst, lnp, bp);
|
|
|
|
av_enter(&av, ocp, EXPENSIVE_LOAD);
|
|
}
|
|
|
|
STATIC put_aar(bp, lnp, lfirst, enp)
|
|
bblock_p bp;
|
|
line_p lnp, lfirst;
|
|
entity_p enp;
|
|
{
|
|
/* Enp points to an ENARRELEM. We do as if its address was computed. */
|
|
|
|
struct avail av;
|
|
occur_p ocp;
|
|
|
|
assert(enp->en_kind == ENARRELEM);
|
|
av.av_instr = op_aar;
|
|
av.av_size = ps;
|
|
av.av_ofirst = enp->en_arbase;
|
|
av.av_osecond = enp->en_index;
|
|
av.av_othird = enp->en_adesc;
|
|
|
|
ocp = newoccur(lfirst, lnp, bp);
|
|
|
|
av_enter(&av, ocp, TERNAIR_OP);
|
|
}
|
|
|
|
STATIC push_avail(avp, lfirst)
|
|
avail_p avp;
|
|
line_p lfirst;
|
|
{
|
|
struct token tk;
|
|
|
|
tk.tk_vn = avp->av_result;
|
|
tk.tk_size = avp->av_size;
|
|
tk.tk_lfirst = lfirst;
|
|
Push(&tk);
|
|
}
|
|
|
|
STATIC push_unair_op(bp, lnp, tkp1)
|
|
bblock_p bp;
|
|
line_p lnp;
|
|
token_p tkp1;
|
|
{
|
|
struct avail av;
|
|
occur_p ocp;
|
|
|
|
av.av_instr = INSTR(lnp);
|
|
av.av_size = avsize(lnp);
|
|
av.av_operand = tkp1->tk_vn;
|
|
|
|
ocp = newoccur(tkp1->tk_lfirst, lnp, bp);
|
|
|
|
push_avail(av_enter(&av, ocp, UNAIR_OP), tkp1->tk_lfirst);
|
|
}
|
|
|
|
STATIC push_binair_op(bp, lnp, tkp1, tkp2)
|
|
bblock_p bp;
|
|
line_p lnp;
|
|
token_p tkp1, tkp2;
|
|
{
|
|
struct avail av;
|
|
occur_p ocp;
|
|
|
|
av.av_instr = INSTR(lnp);
|
|
av.av_size = avsize(lnp);
|
|
av.av_oleft = tkp1->tk_vn;
|
|
av.av_oright = tkp2->tk_vn;
|
|
|
|
ocp = newoccur(tkp1->tk_lfirst, lnp, bp);
|
|
|
|
push_avail(av_enter(&av, ocp, BINAIR_OP), tkp1->tk_lfirst);
|
|
}
|
|
|
|
STATIC push_ternair_op(bp, lnp, tkp1, tkp2, tkp3)
|
|
bblock_p bp;
|
|
line_p lnp;
|
|
token_p tkp1, tkp2, tkp3;
|
|
{
|
|
struct avail av;
|
|
occur_p ocp;
|
|
|
|
av.av_instr = INSTR(lnp);
|
|
av.av_size = avsize(lnp);
|
|
av.av_ofirst = tkp1->tk_vn;
|
|
av.av_osecond = tkp2->tk_vn;
|
|
av.av_othird = tkp3->tk_vn;
|
|
|
|
ocp = newoccur(tkp1->tk_lfirst, lnp, bp);
|
|
|
|
push_avail(av_enter(&av, ocp, TERNAIR_OP), tkp1->tk_lfirst);
|
|
}
|
|
|
|
STATIC fiddle_stack(lnp)
|
|
line_p lnp;
|
|
{
|
|
/* The instruction in lnp does something to the valuenumber-stack. */
|
|
|
|
struct token dummy;
|
|
offset size;
|
|
|
|
/* Partly initialize dummy. */
|
|
dummy.tk_lfirst = lnp;
|
|
|
|
switch (INSTR(lnp)) {
|
|
default:
|
|
assert(FALSE);
|
|
break;
|
|
case op_lor:
|
|
dummy.tk_vn = newvalnum(); dummy.tk_size = ps;
|
|
Push(&dummy);
|
|
break;
|
|
case op_asp:
|
|
if ((size = off_set(lnp)) > 0) {
|
|
Pop(&dummy, size);
|
|
} else {
|
|
dummy.tk_vn = newvalnum();
|
|
dummy.tk_size = size;
|
|
Push(&dummy);
|
|
}
|
|
break;
|
|
case op_dup:
|
|
Dup(lnp);
|
|
break;
|
|
case op_ass:
|
|
case op_dus:
|
|
case op_exg:
|
|
case op_los:
|
|
/* Don't waste effort. */
|
|
clr_stack();
|
|
break;
|
|
case op_sig:
|
|
Pop(&dummy, (offset) ps);
|
|
break;
|
|
case op_lfr:
|
|
dummy.tk_vn = newvalnum();
|
|
dummy.tk_size = off_set(lnp);
|
|
Push(&dummy);
|
|
break;
|
|
case op_beq:
|
|
case op_bge:
|
|
case op_bgt:
|
|
case op_bne:
|
|
case op_ble:
|
|
case op_blt:
|
|
Pop(&dummy, (offset) ws);
|
|
Pop(&dummy, (offset) ws);
|
|
break;
|
|
case op_bra:
|
|
case op_csa:/* ??? */
|
|
case op_csb:/* ??? */
|
|
case op_gto:/* ??? */
|
|
case op_ret:/* ??? */
|
|
case op_rtt:/* ??? */
|
|
break;
|
|
case op_zeq:
|
|
case op_zge:
|
|
case op_zgt:
|
|
case op_zne:
|
|
case op_zle:
|
|
case op_zlt:
|
|
case op_trp:
|
|
Pop(&dummy, (offset) ws);
|
|
break;
|
|
case op_rck:
|
|
Pop(&dummy, (offset) ps);
|
|
break;
|
|
}
|
|
}
|
|
|
|
STATIC proc_p find_proc(vn)
|
|
valnum vn;
|
|
{
|
|
/* Find the procedure-identifier with valuenumber vn. */
|
|
|
|
entity_p enp;
|
|
|
|
enp = find_entity(vn);
|
|
|
|
if (enp != (entity_p) 0 && enp->en_kind == ENPROC)
|
|
return enp->en_pro;
|
|
|
|
return (proc_p) 0;
|
|
}
|
|
|
|
STATIC side_effects(lnp)
|
|
line_p lnp;
|
|
{
|
|
/* Lnp contains a cai or cal instruction. We try to find the callee
|
|
* and see what side-effects it has.
|
|
*/
|
|
struct token tk;
|
|
proc_p pp;
|
|
|
|
if (INSTR(lnp) == op_cai) {
|
|
Pop(&tk, (offset) ps);
|
|
pp = find_proc(tk.tk_vn);
|
|
} else {
|
|
assert(INSTR(lnp) == op_cal);
|
|
pp = PROC(lnp);
|
|
}
|
|
if (pp != (proc_p) 0) {
|
|
kill_call(pp);
|
|
} else {
|
|
kill_much();
|
|
}
|
|
}
|
|
|
|
hopeless(instr)
|
|
int instr;
|
|
{
|
|
/* The effect of `instr' is too difficult to
|
|
* compute. We assume worst case behaviour.
|
|
*/
|
|
switch (instr) {
|
|
default:
|
|
assert(FALSE);
|
|
break;
|
|
case op_mon:
|
|
case op_str:
|
|
case op_nop: /* for volatiles */
|
|
/* We can't even trust "static" entities. */
|
|
kill_all();
|
|
clr_stack();
|
|
break;
|
|
case op_blm:
|
|
case op_bls:
|
|
case op_sts:
|
|
kill_much();
|
|
clr_stack();
|
|
break;
|
|
}
|
|
}
|
|
|
|
vnm(bp)
|
|
bblock_p bp;
|
|
{
|
|
register line_p lnp;
|
|
register entity_p rep;
|
|
line_p lfirst;
|
|
struct token tk, tk1, tk2, tk3;
|
|
|
|
for (lnp = bp->b_start; lnp != (line_p) 0; lnp = lnp->l_next) {
|
|
|
|
rep = getentity(lnp, &lfirst);
|
|
switch (instrgroup(lnp)) {
|
|
case SIMPLE_LOAD:
|
|
push_entity(rep, lfirst);
|
|
break;
|
|
case LOAD_ARRAY:
|
|
put_aar(bp, lnp, lfirst, rep);
|
|
/* Fall through ... */
|
|
case EXPENSIVE_LOAD:
|
|
push_entity(rep, lfirst);
|
|
put_expensive_load(bp, lnp, lfirst, rep);
|
|
break;
|
|
case STORE_DIRECT:
|
|
kill_direct(rep);
|
|
Pop(&tk, rep->en_size);
|
|
rep->en_vn = tk.tk_vn;
|
|
break;
|
|
case STORE_ARRAY:
|
|
put_aar(bp, lnp, lfirst, rep);
|
|
/* Fall through ... */
|
|
case STORE_INDIR:
|
|
kill_indir(rep);
|
|
Pop(&tk, rep->en_size);
|
|
rep->en_vn = tk.tk_vn;
|
|
break;
|
|
case UNAIR_OP:
|
|
Pop(&tk1, op11size(lnp));
|
|
push_unair_op(bp, lnp, &tk1);
|
|
break;
|
|
case BINAIR_OP:
|
|
Pop(&tk2, op22size(lnp));
|
|
Pop(&tk1, op12size(lnp));
|
|
push_binair_op(bp, lnp, &tk1, &tk2);
|
|
break;
|
|
case TERNAIR_OP:
|
|
Pop(&tk3, op33size(lnp));
|
|
Pop(&tk2, op23size(lnp));
|
|
Pop(&tk1, op13size(lnp));
|
|
push_ternair_op(bp, lnp, &tk1, &tk2, &tk3);
|
|
break;
|
|
case KILL_ENTITY:
|
|
kill_direct(rep);
|
|
break;
|
|
case SIDE_EFFECTS:
|
|
side_effects(lnp);
|
|
break;
|
|
case FIDDLE_STACK:
|
|
fiddle_stack(lnp);
|
|
break;
|
|
case IGNORE:
|
|
break;
|
|
case HOPELESS:
|
|
hopeless(INSTR(lnp));
|
|
break;
|
|
case BBLOCK_END:
|
|
fiddle_stack(lnp);
|
|
break;
|
|
default:
|
|
assert(FALSE);
|
|
break;
|
|
}
|
|
}
|
|
}
|