ref: 61870c24fae357b78029ce54be0c004e1ffdb3c7
dir: /appl/cmd/limbo/ecom.b/
maxstack: int; # max size of a stack frame called
precasttab := array[Tend] of array of ref Type;
optabinit()
{
ct := array[Tend] of ref Type;
for(i := 0; i < Tend; i++)
precasttab[i] = ct;
precasttab[Tstring] = array[Tend] of { Tbyte => tint, Tfix => treal, };
precasttab[Tbig] = array[Tend] of { Tbyte => tint, Tfix => treal, };
precasttab[Treal] = array[Tend] of { Tbyte => tint, };
precasttab[Tfix] = array[Tend] of { Tbyte => tint, Tstring => treal, Tbig => treal, };
precasttab[Tbyte] = array[Tend] of { Tstring => tint, Tbig => tint, Treal => tint, Tfix => tint, };
casttab = array[Tend] of { * => array[Tend] of {* => 0}};
casttab[Tint][Tint] = IMOVW;
casttab[Tbig][Tbig] = IMOVL;
casttab[Treal][Treal] = IMOVF;
casttab[Tbyte][Tbyte] = IMOVB;
casttab[Tstring][Tstring] = IMOVP;
casttab[Tfix][Tfix] = ICVTXX; # never same type
casttab[Tint][Tbyte] = ICVTWB;
casttab[Tint][Treal] = ICVTWF;
casttab[Tint][Tstring] = ICVTWC;
casttab[Tint][Tfix] = ICVTXX;
casttab[Tbyte][Tint] = ICVTBW;
casttab[Treal][Tint] = ICVTFW;
casttab[Tstring][Tint] = ICVTCW;
casttab[Tfix][Tint] = ICVTXX;
casttab[Tint][Tbig] = ICVTWL;
casttab[Treal][Tbig] = ICVTFL;
casttab[Tstring][Tbig] = ICVTCL;
casttab[Tbig][Tint] = ICVTLW;
casttab[Tbig][Treal] = ICVTLF;
casttab[Tbig][Tstring] = ICVTLC;
casttab[Treal][Tstring] = ICVTFC;
casttab[Tstring][Treal] = ICVTCF;
casttab[Treal][Tfix] = ICVTFX;
casttab[Tfix][Treal] = ICVTXF;
casttab[Tstring][Tarray] = ICVTCA;
casttab[Tarray][Tstring] = ICVTAC;
#
# placeholders; fixed in precasttab
#
casttab[Tbyte][Tstring] = 16rff;
casttab[Tstring][Tbyte] = 16rff;
casttab[Tbyte][Treal] = 16rff;
casttab[Treal][Tbyte] = 16rff;
casttab[Tbyte][Tbig] = 16rff;
casttab[Tbig][Tbyte] = 16rff;
casttab[Tfix][Tbyte] = 16rff;
casttab[Tbyte][Tfix] = 16rff;
casttab[Tfix][Tbig] = 16rff;
casttab[Tbig][Tfix] = 16rff;
casttab[Tfix][Tstring] = 16rff;
casttab[Tstring][Tfix] = 16rff;
}
#
# global variable and constant initialization checking
#
vcom(ids: ref Decl): int
{
ok := 1;
for(v := ids; v != nil; v = v.next)
ok &= varcom(v);
for(v = ids; v != nil; v = v.next)
v.init = simplify(v.init);
return ok;
}
simplify(n: ref Node): ref Node
{
if(n == nil)
return nil;
if(debug['F'])
print("simplify %s\n", nodeconv(n));
n = efold(rewrite(n));
if(debug['F'])
print("simplified %s\n", nodeconv(n));
return n;
}
isfix(n: ref Node): int
{
if(n.ty.kind == Tint || n.ty.kind == Tfix){
if(n.op == Ocast)
return n.left.ty.kind == Tint || n.left.ty.kind == Tfix;
return 1;
}
return 0;
}
#
# rewrite an expression to make it easiser to compile,
# or give the correct results
#
rewrite(n: ref Node): ref Node
{
v: big;
t: ref Type;
d: ref Decl;
nn: ref Node;
if(n == nil)
return nil;
left := n.left;
right := n.right;
#
# rewrites
#
case n.op{
Oname =>
d = n.decl;
if(d.importid != nil){
left = mkbin(Omdot, dupn(1, n.src, d.eimport), mkdeclname(n.src, d.importid));
left.ty = n.ty;
return rewrite(left);
}
if((t = n.ty).kind == Texception){
if(int t.cons)
fatal("cons in rewrite Oname");
n = mkbin(Oadd, n, mkconst(n.src, big(2*IBY2WD)));
n = mkunary(Oind, n);
n.ty = t;
n.left.ty = n.left.left.ty = tint;
return rewrite(n);
}
Odas =>
n.op = Oas;
return rewrite(n);
Oneg =>
n.left = rewrite(left);
if(n.ty == treal)
break;
left = n.left;
n.right = left;
n.left = mkconst(n.src, big 0);
n.left.ty = n.ty;
n.op = Osub;
Ocomp =>
v = big 0;
v = ~v;
n.right = mkconst(n.src, v);
n.right.ty = n.ty;
n.left = rewrite(left);
n.op = Oxor;
Oinc or
Odec or
Opreinc or
Opredec =>
n.left = rewrite(left);
case n.ty.kind{
Treal =>
n.right = mkrconst(n.src, 1.0);
Tint or
Tbig or
Tbyte or
Tfix =>
n.right = mkconst(n.src, big 1);
n.right.ty = n.ty;
* =>
fatal("can't rewrite inc/dec "+nodeconv(n));
}
if(n.op == Opreinc)
n.op = Oaddas;
else if(n.op == Opredec)
n.op = Osubas;
Oslice =>
if(right.left.op == Onothing)
right.left = mkconst(right.left.src, big 0);
n.left = rewrite(left);
n.right = rewrite(right);
Oindex =>
n.op = Oindx;
n.left = rewrite(left);
n.right = rewrite(right);
n = mkunary(Oind, n);
n.ty = n.left.ty;
n.left.ty = tint;
Oload =>
n.right = mkn(Oname, nil, nil);
n.right.src = n.left.src;
n.right.decl = n.ty.tof.decl;
n.right.ty = n.ty;
n.left = rewrite(left);
Ocast =>
if(left.ty.kind == Texception){
n = rewrite(left);
break;
}
n.op = Ocast;
t = precasttab[left.ty.kind][n.ty.kind];
if(t != nil){
n.left = mkunary(Ocast, left);
n.left.ty = t;
return rewrite(n);
}
n.left = rewrite(left);
Oraise =>
if(left.ty == tstring)
;
else if(left.ty.cons == byte 0)
break;
else if(left.op != Ocall || left.left.ty.kind == Tfn){
left = mkunary(Ocall, left);
left.ty = left.left.ty;
}
n.left = rewrite(left);
Ocall =>
t = left.ty;
if(t.kind == Tref)
t = t.tof;
if(t.kind == Tfn){
if(left.ty.kind == Tref){ # call by function reference
n.left = mkunary(Oind, left);
n.left.ty = t;
return rewrite(n);
}
d = nil;
if(left.op == Oname)
d = left.decl;
else if(left.op == Omdot && left.right.op == Odot)
d = left.right.right.decl;
else if(left.op == Omdot || left.op == Odot)
d = left.right.decl;
else if(left.op != Oind)
fatal("cannot deal with call " + nodeconv(n) + " in rewrite");
if(ispoly(d))
addfnptrs(d, 0);
n.left = rewrite(left);
if(right != nil)
n.right = rewrite(right);
if(d != nil && int d.inline == 1)
n = simplify(inline(n));
break;
}
case n.ty.kind{
Tref =>
n = mkunary(Oref, n);
n.ty = n.left.ty;
n.left.ty = n.left.ty.tof;
n.left.left.ty = n.left.ty;
return rewrite(n);
Tadt =>
n.op = Otuple;
n.right = nil;
if(n.ty.tags != nil){
n.left = nn = mkunary(Oseq, mkconst(n.src, big left.right.decl.tag));
if(right != nil){
nn.right = right;
nn.src.stop = right.src.stop;
}
n.ty = left.right.decl.ty.tof;
}else
n.left = right;
return rewrite(n);
Tadtpick =>
n.op = Otuple;
n.right = nil;
n.left = nn = mkunary(Oseq, mkconst(n.src, big left.right.decl.tag));
if(right != nil){
nn.right = right;
nn.src.stop = right.src.stop;
}
n.ty = left.right.decl.ty.tof;
return rewrite(n);
Texception =>
if(n.ty.cons == byte 0)
return n.left;
if(left.op == Omdot){
left.right.ty = left.ty;
left = left.right;
}
n.op = Otuple;
n.right = nil;
n.left = nn = mkunary(Oseq, left.decl.init);
nn.right = mkunary(Oseq, mkconst(n.src, big 0));
nn.right.right = right;
n.ty = mkexbasetype(n.ty);
n = mkunary(Oref, n);
n.ty = internaltype(mktype(n.src.start, n.src.stop, Tref, t, nil));
return rewrite(n);
* =>
fatal("can't deal with "+nodeconv(n)+" in rewrite/Ocall");
}
Omdot =>
#
# what about side effects from left?
#
d = right.decl;
case d.store{
Dfn =>
n.left = rewrite(left);
if(right.op == Odot){
n.right = dupn(1, left.src, right.right);
n.right.ty = d.ty;
}
Dconst or
Dtag or
Dtype =>
# handled by fold
return n;
Dglobal =>
right.op = Oconst;
right.c = ref Const(big d.offset, 0.);
right.ty = tint;
n.left = left = mkunary(Oind, left);
left.ty = tint;
n.op = Oadd;
n = mkunary(Oind, n);
n.ty = n.left.ty;
n.left.ty = tint;
n.left = rewrite(n.left);
return n;
Darg =>
return n;
* =>
fatal("can't deal with "+nodeconv(n)+" in rewrite/Omdot");
}
Odot =>
#
# what about side effects from left?
#
d = right.decl;
case d.store{
Dfn =>
if(right.left != nil){
n = mkbin(Omdot, dupn(1, left.src, right.left), right);
right.left = nil;
n.ty = d.ty;
return rewrite(n);
}
if(left.ty.kind == Tpoly){
n = mkbin(Omdot, mkdeclname(left.src, d.link), mkdeclname(left.src, d.link.next));
n.ty = d.ty;
return rewrite(n);
}
n.op = Oname;
n.decl = d;
n.right = nil;
n.left = nil;
return n;
Dconst or
Dtag or
Dtype =>
# handled by fold
return n;
}
if(istuple(left))
return n; # handled by fold
right.op = Oconst;
right.c = ref Const(big d.offset, 0.);
right.ty = tint;
if(left.ty.kind != Tref){
n.left = mkunary(Oadr, left);
n.left.ty = tint;
}
n.op = Oadd;
n = mkunary(Oind, n);
n.ty = n.left.ty;
n.left.ty = tint;
n.left = rewrite(n.left);
return n;
Oadr =>
left = rewrite(left);
n.left = left;
if(left.op == Oind)
return left.left;
Otagof =>
if(n.decl == nil){
n.op = Oind;
return rewrite(n);
}
return n;
Omul or
Odiv =>
left = n.left = rewrite(left);
right = n.right = rewrite(right);
if(n.ty.kind == Tfix && isfix(left) && isfix(right)){
if(left.op == Ocast && tequal(left.ty, n.ty))
n.left = left.left;
if(right.op == Ocast && tequal(right.ty, n.ty))
n.right = right.left;
}
Oself =>
if(newfnptr)
return n;
if(selfdecl == nil){
d = selfdecl = mkids(n.src, enter(".self", 5), tany, nil);
installids(Dglobal, d);
d.refs++;
}
nn = mkn(Oload, nil, nil);
nn.src = n.src;
nn.left = mksconst(n.src, enterstring("$self"));
nn.ty = impdecl.ty;
usetype(nn.ty);
usetype(nn.ty.tof);
nn = rewrite(nn);
nn.op = Oself;
return nn;
Ofnptr =>
if(n.flags == byte 0){
# module
if(left == nil)
left = mkn(Oself, nil, nil);
return rewrite(left);
}
right.flags = n.flags;
n = right;
d = n.decl;
if(int n.flags == FNPTR2){
if(left != nil && left.op != Oname)
fatal("not Oname for addiface");
if(left == nil){
addiface(nil, d);
if(newfnptr)
n.flags |= byte FNPTRN;
}
else
addiface(left.decl, d);
n.ty = tint;
return n;
}
if(int n.flags == FNPTRA){
n = mkdeclname(n.src, d.link);
n.ty = tany;
return n;
}
if(int n.flags == (FNPTRA|FNPTR2)){
n = mkdeclname(n.src, d.link.next);
n.ty = tint;
return n;
}
Ochan =>
if(left == nil)
left = n.left = mkconst(n.src, big 0);
n.left = rewrite(left);
* =>
n.left = rewrite(left);
n.right = rewrite(right);
}
return n;
}
#
# label a node with sethi-ullman numbers and addressablity
# genaddr interprets addable to generate operands,
# so a change here mandates a change there.
#
# addressable:
# const Rconst $value may also be Roff or Rdesc or Rnoff
# Asmall(local) Rreg value(FP)
# Asmall(global) Rmreg value(MP)
# ind(Rareg) Rreg value(FP)
# ind(Ramreg) Rmreg value(MP)
# ind(Rreg) Radr *value(FP)
# ind(Rmreg) Rmadr *value(MP)
# ind(Raadr) Radr value(value(FP))
# ind(Ramadr) Rmadr value(value(MP))
#
# almost addressable:
# adr(Rreg) Rareg
# adr(Rmreg) Ramreg
# add(const, Rareg) Rareg
# add(const, Ramreg) Ramreg
# add(const, Rreg) Raadr
# add(const, Rmreg) Ramadr
# add(const, Raadr) Raadr
# add(const, Ramadr) Ramadr
# adr(Radr) Raadr
# adr(Rmadr) Ramadr
#
# strangely addressable:
# fn Rpc
# mdot(module,exp) Rmpc
#
sumark(n: ref Node): ref Node
{
if(n == nil)
return nil;
n.temps = byte 0;
n.addable = Rcant;
left := n.left;
right := n.right;
if(left != nil){
sumark(left);
n.temps = left.temps;
}
if(right != nil){
sumark(right);
if(right.temps == n.temps)
n.temps++;
else if(right.temps > n.temps)
n.temps = right.temps;
}
case n.op{
Oadr =>
case int left.addable{
int Rreg =>
n.addable = Rareg;
int Rmreg =>
n.addable = Ramreg;
int Radr =>
n.addable = Raadr;
int Rmadr =>
n.addable = Ramadr;
}
Oind =>
case int left.addable{
int Rreg =>
n.addable = Radr;
int Rmreg =>
n.addable = Rmadr;
int Rareg =>
n.addable = Rreg;
int Ramreg =>
n.addable = Rmreg;
int Raadr =>
n.addable = Radr;
int Ramadr =>
n.addable = Rmadr;
}
Oname =>
case n.decl.store{
Darg or
Dlocal =>
n.addable = Rreg;
Dglobal =>
n.addable = Rmreg;
if(LDT && n.decl.ty.kind == Tiface)
n.addable = Rldt;
Dtype =>
#
# check for inferface to load
#
if(n.decl.ty.kind == Tmodule)
n.addable = Rmreg;
Dfn =>
if(int n.flags & FNPTR){
if(int n.flags == FNPTR2)
n.addable = Roff;
else if(int n.flags == (FNPTR2|FNPTRN))
n.addable = Rnoff;
}
else
n.addable = Rpc;
* =>
fatal("cannot deal with "+declconv(n.decl)+" in Oname in "+nodeconv(n));
}
Omdot =>
n.addable = Rmpc;
Oconst =>
case n.ty.kind{
Tint or
Tfix =>
v := int n.c.val;
if(v < 0 && ((v >> 29) & 7) != 7
|| v > 0 && (v >> 29) != 0){
n.decl = globalconst(n);
n.addable = Rmreg;
}else
n.addable = Rconst;
Tbig =>
n.decl = globalBconst(n);
n.addable = Rmreg;
Tbyte =>
n.decl = globalbconst(n);
n.addable = Rmreg;
Treal =>
n.decl = globalfconst(n);
n.addable = Rmreg;
Tstring =>
n.decl = globalsconst(n);
n.addable = Rmreg;
* =>
fatal("cannot const in sumark "+typeconv(n.ty));
}
Oadd =>
if(right.addable == Rconst){
case int left.addable{
int Rareg =>
n.addable = Rareg;
int Ramreg =>
n.addable = Ramreg;
int Rreg or
int Raadr =>
n.addable = Raadr;
int Rmreg or
int Ramadr =>
n.addable = Ramadr;
}
}
}
if(n.addable < Rcant)
n.temps = byte 0;
else if(n.temps == byte 0)
n.temps = byte 1;
return n;
}
mktn(t: ref Type): ref Node
{
n := mkn(Oname, nil, nil);
usedesc(mktdesc(t));
n.ty = t;
if(t.decl == nil)
fatal("mktn nil decl t "+typeconv(t));
n.decl = t.decl;
n.addable = Rdesc;
return n;
}
# does a tuple of the form (a, b, ...) form a contiguous block
# of memory on the stack when offsets are assigned later
# - only when (a, b, ...) := rhs and none of the names nil
# can we guarantee this
#
tupblk0(n: ref Node, d: ref Decl): (int, ref Decl)
{
ok, nid: int;
case(n.op){
Otuple =>
for(n = n.left; n != nil; n = n.right){
(ok, d) = tupblk0(n.left, d);
if(!ok)
return (0, nil);
}
return (1, d);
Oname =>
if(n.decl == nildecl)
return (0, nil);
if(d != nil && d.next != n.decl)
return (0, nil);
nid = int n.decl.nid;
if(d == nil && nid == 1)
return (0, nil);
if(d != nil && nid != 0)
return (0, nil);
return (1, n.decl);
}
return (0, nil);
}
# could force locals to be next to each other
# - need to shuffle locals list
# - later
#
tupblk(n: ref Node): ref Node
{
ok: int;
d: ref Decl;
if(n.op != Otuple)
return nil;
d = nil;
(ok, d) = tupblk0(n, d);
if(!ok)
return nil;
while(n.op == Otuple)
n = n.left.left;
if(n.op != Oname || n.decl.nid == byte 1)
fatal("bad tupblk");
return n;
}
# for cprof
esrc(src: Src, osrc: Src, nto: ref Node): Src
{
if(nto != nil && src.start != 0 && src.stop != 0)
return src;
return osrc;
}
#
# compile an expression with an implicit assignment
# note: you are not allowed to use nto.src
#
# need to think carefully about the types used in moves
#
ecom(src: Src, nto, n: ref Node): ref Node
{
tleft, tright, tto, ttn: ref Node;
t: ref Type;
p: ref Inst;
if(debug['e']){
print("ecom: %s\n", nodeconv(n));
if(nto != nil)
print("ecom nto: %s\n", nodeconv(nto));
}
if(n.addable < Rcant){
#
# think carefully about the type used here
#
if(nto != nil)
genmove(src, Mas, n.ty, n, nto);
return nto;
}
left := n.left;
right := n.right;
op := n.op;
case op{
* =>
fatal("can't ecom "+nodeconv(n));
return nto;
Oif =>
p = bcom(left, 1, nil);
ecom(right.left.src, nto, right.left);
if(right.right != nil){
pp := p;
p = genrawop(right.left.src, IJMP, nil, nil, nil);
patch(pp, nextinst());
ecom(right.right.src, nto, right.right);
}
patch(p, nextinst());
Ocomma =>
ttn = left.left;
ecom(left.src, nil, left);
ecom(right.src, nto, right);
tfree(ttn);
Oname =>
if(n.addable == Rpc){
if(nto != nil)
genmove(src, Mas, n.ty, n, nto);
return nto;
}
fatal("can't ecom "+nodeconv(n));
Onothing =>
break;
Oused =>
if(nto != nil)
fatal("superflous used "+nodeconv(left)+" nto "+nodeconv(nto));
tto = talloc(left.ty, nil);
ecom(left.src, tto, left);
tfree(tto);
Oas =>
if(right.ty == tany)
right.ty = n.ty;
if(left.op == Oname && left.decl.ty == tany){
if(nto == nil)
nto = tto = talloc(right.ty, nil);
left = nto;
nto = nil;
}
if(left.op == Oinds){
indsascom(src, nto, n);
tfree(tto);
break;
}
if(left.op == Oslice){
slicelcom(src, nto, n);
tfree(tto);
break;
}
if(left.op == Otuple){
if(!tupsaliased(right, left)){
if((tn := tupblk(left)) != nil){
tn.ty = n.ty;
ecom(n.right.src, tn, right);
if(nto != nil)
genmove(src, Mas, n.ty, tn, nto);
tfree(tto);
break;
}
if((tn = tupblk(right)) != nil){
tn.ty = n.ty;
tuplcom(tn, left);
if(nto != nil)
genmove(src, Mas, n.ty, tn, nto);
tfree(tto);
break;
}
if(nto == nil && right.op == Otuple && left.ty.kind != Tadtpick){
tuplrcom(right, left);
tfree(tto);
break;
}
}
if(right.addable >= Ralways
|| right.op != Oname
|| tupaliased(right, left)){
tright = talloc(n.ty, nil);
ecom(n.right.src, tright, right);
right = tright;
}
tuplcom(right, n.left);
if(nto != nil)
genmove(src, Mas, n.ty, right, nto);
tfree(tright);
tfree(tto);
break;
}
#
# check for left/right aliasing and build right into temporary
#
if(right.op == Otuple){
if(!tupsaliased(left, right) && (tn := tupblk(right)) != nil){
tn.ty = n.ty;
right = tn;
}
else if(left.op != Oname || tupaliased(left, right))
right = ecom(right.src, tright = talloc(right.ty, nil), right);
}
#
# think carefully about types here
#
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nto);
ecom(n.src, left, right);
if(nto != nil)
genmove(src, Mas, nto.ty, left, nto);
tfree(tleft);
tfree(tright);
tfree(tto);
Ochan =>
if(left != nil && left.addable >= Rcant)
(left, tleft) = eacom(left, nto);
genchan(src, left, n.ty.tof, nto);
tfree(tleft);
Oinds =>
if(right.addable < Ralways){
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nil);
}else if(left.temps <= right.temps){
right = ecom(right.src, tright = talloc(right.ty, nil), right);
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nil);
}else{
(left, tleft) = eacom(left, nil);
right = ecom(right.src, tright = talloc(right.ty, nil), right);
}
genop(n.src, op, left, right, nto);
tfree(tleft);
tfree(tright);
Osnd =>
if(right.addable < Rcant){
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nto);
}else if(left.temps < right.temps){
(right, tright) = eacom(right, nto);
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nil);
}else{
(left, tleft) = eacom(left, nto);
(right, tright) = eacom(right, nil);
}
p = genrawop(n.src, ISEND, right, nil, left);
p.m.offset = n.ty.size; # for optimizer
if(nto != nil)
genmove(src, Mas, right.ty, right, nto);
tfree(tleft);
tfree(tright);
Orcv =>
if(nto == nil){
ecom(n.src, tto = talloc(n.ty, nil), n);
tfree(tto);
return nil;
}
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nto);
if(left.ty.kind == Tchan){
p = genrawop(src, IRECV, left, nil, nto);
p.m.offset = n.ty.size; # for optimizer
}else{
recvacom(src, nto, n);
}
tfree(tleft);
Ocons =>
#
# another temp which can go with analysis
#
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nil);
if(!sameaddr(right, nto)){
ecom(right.src, tto = talloc(n.ty, nto), right);
genmove(src, Mcons, left.ty, left, tto);
if(!sameaddr(tto, nto))
genmove(src, Mas, nto.ty, tto, nto);
}else
genmove(src, Mcons, left.ty, left, nto);
tfree(tleft);
tfree(tto);
Ohd =>
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nto);
genmove(src, Mhd, nto.ty, left, nto);
tfree(tleft);
Otl =>
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nto);
genmove(src, Mtl, left.ty, left, nto);
tfree(tleft);
Otuple =>
if((tn := tupblk(n)) != nil){
tn.ty = n.ty;
genmove(src, Mas, n.ty, tn, nto);
break;
}
tupcom(nto, n);
Oadd or
Osub or
Omul or
Odiv or
Omod or
Oand or
Oor or
Oxor or
Olsh or
Orsh or
Oexp =>
#
# check for 2 operand forms
#
if(sameaddr(nto, left)){
if(right.addable >= Rcant)
(right, tright) = eacom(right, nto);
genop(src, op, right, nil, nto);
tfree(tright);
break;
}
if(opcommute[op] && sameaddr(nto, right) && n.ty != tstring){
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nto);
genop(src, opcommute[op], left, nil, nto);
tfree(tleft);
break;
}
if(right.addable < left.addable
&& opcommute[op]
&& n.ty != tstring){
op = opcommute[op];
left = right;
right = n.left;
}
if(left.addable < Ralways){
if(right.addable >= Rcant)
(right, tright) = eacom(right, nto);
}else if(right.temps <= left.temps){
left = ecom(left.src, tleft = talloc(left.ty, nto), left);
if(right.addable >= Rcant)
(right, tright) = eacom(right, nil);
}else{
(right, tright) = eacom(right, nto);
left = ecom(left.src, tleft = talloc(left.ty, nil), left);
}
#
# check for 2 operand forms
#
if(sameaddr(nto, left))
genop(src, op, right, nil, nto);
else if(opcommute[op] && sameaddr(nto, right) && n.ty != tstring)
genop(src, opcommute[op], left, nil, nto);
else
genop(src, op, right, left, nto);
tfree(tleft);
tfree(tright);
Oaddas or
Osubas or
Omulas or
Odivas or
Omodas or
Oexpas or
Oandas or
Ooras or
Oxoras or
Olshas or
Orshas =>
if(left.op == Oinds){
indsascom(src, nto, n);
break;
}
if(right.addable < Rcant){
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nto);
}else if(left.temps < right.temps){
(right, tright) = eacom(right, nto);
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nil);
}else{
(left, tleft) = eacom(left, nto);
(right, tright) = eacom(right, nil);
}
genop(n.src, op, right, nil, left);
if(nto != nil)
genmove(src, Mas, left.ty, left, nto);
tfree(tleft);
tfree(tright);
Olen =>
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nto);
op = -1;
t = left.ty;
if(t == tstring)
op = ILENC;
else if(t.kind == Tarray)
op = ILENA;
else if(t.kind == Tlist)
op = ILENL;
else
fatal("can't len "+nodeconv(n));
genrawop(src, op, left, nil, nto);
tfree(tleft);
Oneg =>
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nto);
genop(n.src, op, left, nil, nto);
tfree(tleft);
Oinc or
Odec =>
if(left.op == Oinds){
indsascom(src, nto, n);
break;
}
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nil);
if(nto != nil)
genmove(src, Mas, left.ty, left, nto);
if(right.addable >= Rcant)
fatal("inc/dec amount not addressable: "+nodeconv(n));
genop(n.src, op, right, nil, left);
tfree(tleft);
Ospawn =>
if(left.left.op == Oind)
fpcall(n.src, op, left, nto);
else
callcom(n.src, op, left, nto);
Oraise =>
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nil);
genrawop(n.src, IRAISE, left, nil, nil);
tfree(tleft);
Ocall =>
if(left.op == Oind)
fpcall(esrc(src, n.src, nto), op, n, nto);
else
callcom(esrc(src, n.src, nto), op, n, nto);
Oref =>
t = left.ty;
if(left.op == Oname && left.decl.store == Dfn || left.op == Omdot && left.right.op == Oname && left.right.decl.store == Dfn){ # create a function reference
mod, ind: ref Node;
d := left.decl;
if(left.op == Omdot){
d = left.right.decl;
mod = left.left;
}
else if(d.eimport != nil)
mod = d.eimport;
else{
mod = rewrite(mkn(Oself, nil, nil));
addiface(nil, d);
}
sumark(mod);
tto = talloc(n.ty, nto);
genrawop(src, INEW, mktn(usetype(tfnptr)), nil, tto);
tright = ref znode;
tright.src = src;
tright.op = Oind;
tright.left = tto;
tright.right = nil;
tright.ty = tany;
sumark(tright);
ecom(src, tright, mod);
ind = mkunary(Oind, mkbin(Oadd, dupn(0, src, tto), mkconst(src, big IBY2WD)));
ind.ty = ind.left.ty = ind.left.right.ty = tint;
tright.op = Oas;
tright.left = ind;
tright.right = mkdeclname(src, d);
tright.ty = tright.right.ty = tint;
sumark(tright);
if(mod.op == Oself && newfnptr)
tright.right.addable = Rnoff;
else
tright.right.addable = Roff;
ecom(src, nil, tright);
if(!sameaddr(tto, nto))
genmove(src, Mas, n.ty, tto, nto);
tfree(tto);
break;
}
if(left.op == Oname && left.decl.store == Dtype){
genrawop(src, INEW, mktn(t), nil, nto);
break;
}
if(t.kind == Tadt && t.tags != nil){
pickdupcom(src, nto, left);
break;
}
tt := t;
if(left.op == Oconst && left.decl.store == Dtag)
t = left.decl.ty.tof;
#
# could eliminate temp if nto does not occur
# in tuple initializer
#
tto = talloc(n.ty, nto);
genrawop(src, INEW, mktn(t), nil, tto);
tright = ref znode;
tright.op = Oind;
tright.left = tto;
tright.right = nil;
tright.ty = tt;
sumark(tright);
ecom(src, tright, left);
if(!sameaddr(tto, nto))
genmove(src, Mas, n.ty, tto, nto);
tfree(tto);
Oload =>
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nto);
tright = talloc(tint, nil);
if(LDT)
genrawop(src, ILOAD, left, right, nto);
else{
genrawop(src, ILEA, right, nil, tright);
genrawop(src, ILOAD, left, tright, nto);
}
tfree(tleft);
tfree(tright);
Ocast =>
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nto);
t = left.ty;
if(t.kind == Tfix || n.ty.kind == Tfix){
op = casttab[t.kind][n.ty.kind];
if(op == ICVTXX)
genfixcastop(src, op, left, nto);
else{
ttn = sumark(mkrconst(src, scale2(t, n.ty)));
genrawop(src, op, left, ttn, nto);
}
}
else
genrawop(src, casttab[t.kind][n.ty.kind], left, nil, nto);
tfree(tleft);
Oarray =>
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nto);
if(arrayz)
genrawop(esrc(src, left.src, nto), INEWAZ, left, mktn(n.ty.tof), nto);
else
genrawop(esrc(src, left.src, nto), INEWA, left, mktn(n.ty.tof), nto);
if(right != nil)
arraycom(nto, right);
tfree(tleft);
Oslice =>
tn := right.right;
right = right.left;
#
# make the left node of the slice directly addressable
# therefore, if it's len is taken (via tn),
# left's tree won't be rewritten
#
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nil);
if(tn.op == Onothing){
tn = mkn(Olen, left, nil);
tn.src = src;
tn.ty = tint;
sumark(tn);
}
if(tn.addable < Ralways){
if(right.addable >= Rcant)
(right, tright) = eacom(right, nil);
}else if(right.temps <= tn.temps){
tn = ecom(tn.src, ttn = talloc(tn.ty, nil), tn);
if(right.addable >= Rcant)
(right, tright) = eacom(right, nil);
}else{
(right, tright) = eacom(right, nil);
tn = ecom(tn.src, ttn = talloc(tn.ty, nil), tn);
}
op = ISLICEA;
if(nto.ty == tstring)
op = ISLICEC;
#
# overwrite the destination last,
# since it might be used in computing the slice bounds
#
if(!sameaddr(left, nto))
ecom(left.src, nto, left);
genrawop(src, op, right, tn, nto);
tfree(tleft);
tfree(tright);
tfree(ttn);
Oindx =>
if(right.addable < Rcant){
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nto);
}else if(left.temps < right.temps){
(right, tright) = eacom(right, nto);
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nil);
}else{
(left, tleft) = eacom(left, nto);
(right, tright) = eacom(right, nil);
}
if(nto.addable >= Ralways)
nto = ecom(src, tto = talloc(nto.ty, nil), nto);
op = IINDX;
case left.ty.tof.size{
IBY2LG =>
op = IINDL;
if(left.ty.tof == treal)
op = IINDF;
IBY2WD =>
op = IINDW;
1 =>
op = IINDB;
}
genrawop(src, op, left, nto, right);
if(tleft != nil && tleft.decl != nil)
tfreelater(tleft);
else
tfree(tleft);
tfree(tright);
tfree(tto);
Oind =>
(n, tleft) = eacom(n, nto);
genmove(src, Mas, n.ty, n, nto);
tfree(tleft);
Onot or
Oandand or
Ooror or
Oeq or
Oneq or
Olt or
Oleq or
Ogt or
Ogeq =>
p = bcom(n, 1, nil);
genmove(src, Mas, tint, sumark(mkconst(src, big 1)), nto);
pp := genrawop(src, IJMP, nil, nil, nil);
patch(p, nextinst());
genmove(src, Mas, tint, sumark(mkconst(src, big 0)), nto);
patch(pp, nextinst());
Oself =>
if(newfnptr){
if(nto != nil)
genrawop(src, ISELF, nil, nil, nto);
break;
}
tn := sumark(mkdeclname(src, selfdecl));
p = genbra(src, Oneq, tn, sumark(mkdeclname(src, nildecl)));
n.op = Oload;
ecom(src, tn, n);
patch(p, nextinst());
genmove(src, Mas, n.ty, tn, nto);
}
return nto;
}
#
# compile exp n to yield an addressable expression
# use reg to build a temporary; if t is a temp, it is usable
#
# note that 0adr's are strange as they are only used
# for calculating the addresses of fields within adt's.
# therefore an Oind is the parent or grandparent of the Oadr,
# and we pick off all of the cases where Oadr's argument is not
# addressable by looking from the Oind.
#
eacom(n, t: ref Node): (ref Node, ref Node)
{
reg: ref Node;
if(n.op == Ocomma){
tn := n.left.left;
ecom(n.left.src, nil, n.left);
nn := eacom(n.right, t);
tfree(tn);
return nn;
}
if(debug['e'] || debug['E'])
print("eacom: %s\n", nodeconv(n));
left := n.left;
if(n.op != Oind){
ecom(n.src, reg = talloc(n.ty, t), n);
reg.src = n.src;
return (reg, reg);
}
if(left.op == Oadd && left.right.op == Oconst){
if(left.left.op == Oadr){
(left.left.left, reg) = eacom(left.left.left, t);
sumark(n);
if(n.addable >= Rcant)
fatal("eacom can't make node addressable: "+nodeconv(n));
return (n, reg);
}
reg = talloc(left.left.ty, t);
ecom(left.left.src, reg, left.left);
left.left.decl = reg.decl;
left.left.addable = Rreg;
left.left = reg;
left.addable = Raadr;
n.addable = Radr;
}else if(left.op == Oadr){
reg = talloc(left.left.ty, t);
ecom(left.left.src, reg, left.left);
#
# sleaze: treat the temp as the type of the field, not the enclosing structure
#
reg.ty = n.ty;
reg.src = n.src;
return (reg, reg);
}else{
reg = talloc(left.ty, t);
ecom(left.src, reg, left);
n.left = reg;
n.addable = Radr;
}
return (n, reg);
}
#
# compile an assignment to an array slice
#
slicelcom(src: Src, nto, n: ref Node): ref Node
{
tleft, tright, tv: ref Node;
left := n.left.left;
right := n.left.right.left;
v := n.right;
if(right.addable < Ralways){
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nto);
}else if(left.temps <= right.temps){
right = ecom(right.src, tright = talloc(right.ty, nto), right);
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nil);
}else{
(left, tleft) = eacom(left, nil); # dangle on right and v
right = ecom(right.src, tright = talloc(right.ty, nil), right);
}
case n.op{
Oas =>
if(v.addable >= Rcant)
(v, tv) = eacom(v, nil);
}
genrawop(n.src, ISLICELA, v, right, left);
if(nto != nil)
genmove(src, Mas, n.ty, left, nto);
tfree(tleft);
tfree(tv);
tfree(tright);
return nto;
}
#
# compile an assignment to a string location
#
indsascom(src: Src, nto, n: ref Node): ref Node
{
tleft, tright, tv, tu, u: ref Node;
left := n.left.left;
right := n.left.right;
v := n.right;
if(right.addable < Ralways){
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nto);
}else if(left.temps <= right.temps){
right = ecom(right.src, tright = talloc(right.ty, nto), right);
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nil);
}else{
(left, tleft) = eacom(left, nil); # dangle on right and v
right = ecom(right.src, tright = talloc(right.ty, nil), right);
}
case n.op{
Oas =>
if(v.addable >= Rcant)
(v, tv) = eacom(v, nil);
Oinc or
Odec =>
if(v.addable >= Rcant)
fatal("inc/dec amount not addable");
u = tu = talloc(tint, nil);
genop(n.left.src, Oinds, left, right, u);
if(nto != nil)
genmove(src, Mas, n.ty, u, nto);
nto = nil;
genop(n.src, n.op, v, nil, u);
v = u;
Oaddas or
Osubas or
Omulas or
Odivas or
Omodas or
Oexpas or
Oandas or
Ooras or
Oxoras or
Olshas or
Orshas =>
if(v.addable >= Rcant)
(v, tv) = eacom(v, nil);
u = tu = talloc(tint, nil);
genop(n.left.src, Oinds, left, right, u);
genop(n.src, n.op, v, nil, u);
v = u;
}
genrawop(n.src, IINSC, v, right, left);
tfree(tleft);
tfree(tv);
tfree(tright);
tfree(tu);
if(nto != nil)
genmove(src, Mas, n.ty, v, nto);
return nto;
}
callcom(src: Src, op: int, n, ret: ref Node)
{
tmod, tind: ref Node;
callee: ref Decl;
args := n.right;
nfn := n.left;
case(nfn.op){
Odot =>
callee = nfn.right.decl;
nfn.addable = Rpc;
Omdot =>
callee = nfn.right.decl;
Oname =>
callee = nfn.decl;
* =>
callee = nil;
fatal("bad call op in callcom");
}
if(nfn.addable != Rpc && nfn.addable != Rmpc)
fatal("can't gen call addresses");
if(nfn.ty.tof != tnone && ret == nil){
ecom(src, tmod = talloc(nfn.ty.tof, nil), n);
tfree(tmod);
return;
}
if(ispoly(callee))
addfnptrs(callee, 0);
if(nfn.ty.varargs != byte 0){
d := dupdecl(nfn.right.decl);
nfn.decl = d;
d.desc = gendesc(d, idoffsets(nfn.ty.ids, MaxTemp, MaxAlign), nfn.ty.ids);
}
frame := talloc(tint, nil);
mod := nfn.left;
ind := nfn.right;
if(nfn.addable == Rmpc){
if(mod.addable >= Rcant)
(mod, tmod) = eacom(mod, nil); # dangle always
if(ind.op != Oname && ind.addable >= Ralways){
tind = talloc(ind.ty, nil);
ecom(ind.src, tind, ind);
ind = tind;
}
else if(ind.decl != nil && ind.decl.store != Darg)
ind.addable = Roff;
}
#
# stop nested uncalled frames
# otherwise exception handling very complicated
#
for(a := args; a != nil; a = a.right){
if(hascall(a.left)){
tn := talloc(a.left.ty, nil);
ecom(a.left.src, tn, a.left);
a.left = tn;
tn.flags |= byte TEMP;
}
}
#
# allocate the frame
#
if(nfn.addable == Rmpc && nfn.ty.varargs == byte 0){
genrawop(src, IMFRAME, mod, ind, frame);
}else if(nfn.op == Odot){
genrawop(src, IFRAME, nfn.left, nil, frame);
}else{
in := genrawop(src, IFRAME, nil, nil, frame);
in.sm = Adesc;
in.s.decl = nfn.decl;
}
#
# build a fake node for the argument area
#
toff := ref znode;
tadd := ref znode;
pass := ref znode;
toff.op = Oconst;
toff.c = ref Const(big 0, 0.0); # jrf - added initialization
toff.addable = Rconst;
toff.ty = tint;
tadd.op = Oadd;
tadd.addable = Raadr;
tadd.left = frame;
tadd.right = toff;
tadd.ty = tint;
pass.op = Oind;
pass.addable = Radr;
pass.left = tadd;
#
# compile all the args
#
d := nfn.ty.ids;
off := 0;
for(a = args; a != nil; a = a.right){
off = d.offset;
toff.c.val = big off;
if(d.ty.kind == Tpoly)
pass.ty = a.left.ty;
else
pass.ty = d.ty;
ecom(a.left.src, pass, a.left);
d = d.next;
if(int a.left.flags & TEMP)
tfree(a.left);
}
if(off > maxstack)
maxstack = off;
#
# pass return value
#
if(ret != nil){
toff.c.val = big(REGRET*IBY2WD);
pass.ty = nfn.ty.tof;
p := genrawop(src, ILEA, ret, nil, pass);
p.m.offset = ret.ty.size; # for optimizer
}
#
# call it
#
iop: int;
if(nfn.addable == Rmpc){
iop = IMCALL;
if(op == Ospawn)
iop = IMSPAWN;
genrawop(src, iop, frame, ind, mod);
tfree(tmod);
tfree(tind);
}else if(nfn.op == Odot){
iop = ICALL;
if(op == Ospawn)
iop = ISPAWN;
genrawop(src, iop, frame, nil, nfn.right);
}else{
iop = ICALL;
if(op == Ospawn)
iop = ISPAWN;
in := genrawop(src, iop, frame, nil, nil);
in.d.decl = nfn.decl;
in.dm = Apc;
}
tfree(frame);
}
#
# initialization code for arrays
# a must be addressable (< Rcant)
#
arraycom(a, elems: ref Node)
{
top, out: ref Inst;
ri, n, wild: ref Node;
if(debug['A'])
print("arraycom: %s %s\n", nodeconv(a), nodeconv(elems));
# c := elems.ty.cse;
# don't use c.wild in case we've been inlined
wild = nil;
for(e := elems; e != nil; e = e.right)
for(q := e.left.left; q != nil; q = q.right)
if(q.left.op == Owild)
wild = e.left;
if(wild != nil)
arraydefault(a, wild.right);
tindex := ref znode;
fake := ref znode;
tmp := talloc(tint, nil);
tindex.op = Oindx;
tindex.addable = Rcant;
tindex.left = a;
tindex.right = nil;
tindex.ty = tint;
fake.op = Oind;
fake.addable = Radr;
fake.left = tmp;
fake.ty = a.ty.tof;
for(e = elems; e != nil; e = e.right){
#
# just duplicate the initializer for Oor
#
for(q = e.left.left; q != nil; q = q.right){
if(q.left.op == Owild)
continue;
body := e.left.right;
if(q.right != nil)
body = dupn(0, nosrc, body);
top = nil;
out = nil;
ri = nil;
if(q.left.op == Orange){
#
# for(i := q.left.left; i <= q.left.right; i++)
#
ri = talloc(tint, nil);
ri.src = q.left.src;
ecom(q.left.src, ri, q.left.left);
# i <= q.left.right;
n = mkn(Oleq, ri, q.left.right);
n.src = q.left.src;
n.ty = tint;
top = nextinst();
out = bcom(n, 1, nil);
tindex.right = ri;
}else{
tindex.right = q.left;
}
tindex.addable = Rcant;
tindex.src = q.left.src;
ecom(tindex.src, tmp, tindex);
ecom(body.src, fake, body);
if(q.left.op == Orange){
# i++
n = mkbin(Oinc, ri, sumark(mkconst(ri.src, big 1)));
n.ty = tint;
n.addable = Rcant;
ecom(n.src, nil, n);
# jump to test
patch(genrawop(q.left.src, IJMP, nil, nil, nil), top);
patch(out, nextinst());
tfree(ri);
}
}
}
tfree(tmp);
}
#
# default initialization code for arrays.
# compiles to
# n = len a;
# while(n){
# n--;
# a[n] = elem;
# }
#
arraydefault(a, elem: ref Node)
{
e: ref Node;
if(debug['A'])
print("arraydefault: %s %s\n", nodeconv(a), nodeconv(elem));
t := mkn(Olen, a, nil);
t.src = elem.src;
t.ty = tint;
t.addable = Rcant;
n := talloc(tint, nil);
n.src = elem.src;
ecom(t.src, n, t);
top := nextinst();
out := bcom(n, 1, nil);
t = mkbin(Odec, n, sumark(mkconst(elem.src, big 1)));
t.ty = tint;
t.addable = Rcant;
ecom(t.src, nil, t);
if(elem.addable >= Rcant)
(elem, e) = eacom(elem, nil);
t = mkn(Oindx, a, n);
t.src = elem.src;
t = mkbin(Oas, mkunary(Oind, t), elem);
t.ty = elem.ty;
t.left.ty = elem.ty;
t.left.left.ty = tint;
sumark(t);
ecom(t.src, nil, t);
patch(genrawop(t.src, IJMP, nil, nil, nil), top);
tfree(n);
tfree(e);
patch(out, nextinst());
}
tupcom(nto, n: ref Node)
{
if(debug['Y'])
print("tupcom %s\nto %s\n", nodeconv(n), nodeconv(nto));
#
# build a fake node for the tuple
#
toff := ref znode;
tadd := ref znode;
fake := ref znode;
tadr := ref znode;
toff.op = Oconst;
toff.c = ref Const(big 0, 0.0); # no val => may get fatal error below (jrf)
toff.ty = tint;
tadr.op = Oadr;
tadr.left = nto;
tadr.ty = tint;
tadd.op = Oadd;
tadd.left = tadr;
tadd.right = toff;
tadd.ty = tint;
fake.op = Oind;
fake.left = tadd;
sumark(fake);
if(fake.addable >= Rcant)
fatal("tupcom: bad value exp "+nodeconv(fake));
#
# compile all the exps
#
d := n.ty.ids;
for(e := n.left; e != nil; e = e.right){
toff.c.val = big d.offset;
fake.ty = d.ty;
ecom(e.left.src, fake, e.left);
d = d.next;
}
}
tuplcom(n, nto: ref Node)
{
if(debug['Y'])
print("tuplcom %s\nto %s\n", nodeconv(n), nodeconv(nto));
#
# build a fake node for the tuple
#
toff := ref znode;
tadd := ref znode;
fake := ref znode;
tadr := ref znode;
toff.op = Oconst;
toff.c = ref Const(big 0, 0.0); # no val => may get fatal error below (jrf)
toff.ty = tint;
tadr.op = Oadr;
tadr.left = n;
tadr.ty = tint;
tadd.op = Oadd;
tadd.left = tadr;
tadd.right = toff;
tadd.ty = tint;
fake.op = Oind;
fake.left = tadd;
sumark(fake);
if(fake.addable >= Rcant)
fatal("tuplcom: bad value exp for "+nodeconv(fake));
#
# compile all the exps
#
tas := ref znode;
d := nto.ty.ids;
if(nto.ty.kind == Tadtpick)
d = nto.ty.tof.ids.next;
for(e := nto.left; e != nil; e = e.right){
as := e.left;
if(as.op != Oname || as.decl != nildecl){
toff.c.val = big d.offset;
fake.ty = d.ty;
fake.src = as.src;
if(as.addable < Rcant)
genmove(as.src, Mas, d.ty, fake, as);
else{
tas.op = Oas;
tas.ty = d.ty;
tas.src = as.src;
tas.left = as;
tas.right = fake;
tas.addable = Rcant;
ecom(as.src, nil, tas);
}
}
d = d.next;
}
}
tuplrcom(n: ref Node, nto: ref Node)
{
s, d, tas: ref Node;
de: ref Decl;
tas = ref znode;
de = nto.ty.ids;
for((s, d) = (n.left, nto.left); s != nil && d != nil; (s, d) = (s.right, d.right)){
if(d.left.op != Oname || d.left.decl != nildecl){
tas.op = Oas;
tas.ty = de.ty;
tas.src = s.left.src;
tas.left = d.left;
tas.right = s.left;
sumark(tas);
ecom(tas.src, nil, tas);
}
de = de.next;
}
if(s != nil || d != nil)
fatal("tuplrcom");
}
#
# boolean compiler
# fall through when condition == true
#
bcom(n: ref Node, iftrue: int, b: ref Inst): ref Inst
{
tleft, tright: ref Node;
if(n.op == Ocomma){
tn := n.left.left;
ecom(n.left.src, nil, n.left);
b = bcom(n.right, iftrue, b);
tfree(tn);
return b;
}
if(debug['b'])
print("bcom %s %d\n", nodeconv(n), iftrue);
left := n.left;
right := n.right;
op := n.op;
case op{
Onothing =>
return b;
Onot =>
return bcom(n.left, !iftrue, b);
Oandand =>
if(!iftrue)
return oror(n, iftrue, b);
return andand(n, iftrue, b);
Ooror =>
if(!iftrue)
return andand(n, iftrue, b);
return oror(n, iftrue, b);
Ogt or
Ogeq or
Oneq or
Oeq or
Olt or
Oleq =>
break;
* =>
if(n.ty.kind == Tint){
right = mkconst(n.src, big 0);
right.addable = Rconst;
left = n;
op = Oneq;
break;
}
fatal("can't bcom "+nodeconv(n));
return b;
}
if(iftrue)
op = oprelinvert[op];
if(left.addable < right.addable){
t := left;
left = right;
right = t;
op = opcommute[op];
}
if(right.addable < Ralways){
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nil);
}else if(left.temps <= right.temps){
right = ecom(right.src, tright = talloc(right.ty, nil), right);
if(left.addable >= Rcant)
(left, tleft) = eacom(left, nil);
}else{
(left, tleft) = eacom(left, nil);
right = ecom(right.src, tright = talloc(right.ty, nil), right);
}
bb := genbra(n.src, op, left, right);
bb.branch = b;
tfree(tleft);
tfree(tright);
return bb;
}
andand(n: ref Node, iftrue: int, b: ref Inst): ref Inst
{
if(debug['b'])
print("andand %s\n", nodeconv(n));
b = bcom(n.left, iftrue, b);
b = bcom(n.right, iftrue, b);
return b;
}
oror(n: ref Node, iftrue: int, b: ref Inst): ref Inst
{
if(debug['b'])
print("oror %s\n", nodeconv(n));
bb := bcom(n.left, !iftrue, nil);
b = bcom(n.right, iftrue, b);
patch(bb, nextinst());
return b;
}
#
# generate code for a recva expression
# this is just a hacked up small alt
#
recvacom(src: Src, nto, n: ref Node)
{
p: ref Inst;
left := n.left;
labs := array[1] of Label;
labs[0].isptr = left.addable >= Rcant;
c := ref Case;
c.nlab = 1;
c.nsnd = 0;
c.offset = 0;
c.labs = labs;
talt := mktalt(c);
which := talloc(tint, nil);
tab := talloc(talt, nil);
#
# build the node for the address of each channel,
# the values to send, and the storage for values received
#
off := ref znode;
adr := ref znode;
add := ref znode;
slot := ref znode;
off.op = Oconst;
off.c = ref Const(big 0, 0.0); # jrf - added initialization
off.ty = tint;
off.addable = Rconst;
adr.op = Oadr;
adr.left = tab;
adr.ty = tint;
add.op = Oadd;
add.left = adr;
add.right = off;
add.ty = tint;
slot.op = Oind;
slot.left = add;
sumark(slot);
#
# gen the channel
# this sleaze is lying to the garbage collector
#
off.c.val = big(2*IBY2WD);
if(left.addable < Rcant)
genmove(src, Mas, tint, left, slot);
else{
slot.ty = left.ty;
ecom(src, slot, left);
slot.ty = nil;
}
#
# gen the value
#
off.c.val += big IBY2WD;
p = genrawop(left.src, ILEA, nto, nil, slot);
p.m.offset = nto.ty.size; # for optimizer
#
# number of senders and receivers
#
off.c.val = big 0;
genmove(src, Mas, tint, sumark(mkconst(src, big 0)), slot);
off.c.val += big IBY2WD;
genmove(src, Mas, tint, sumark(mkconst(src, big 1)), slot);
off.c.val += big IBY2WD;
p = genrawop(src, IALT, tab, nil, which);
p.m.offset = talt.size; # for optimizer
tfree(which);
tfree(tab);
}
#
# generate code to duplicate an adt with pick fields
# this is just a hacked up small pick
# n is Oind(exp)
#
pickdupcom(src: Src, nto, n: ref Node)
{
jmps: ref Inst;
if(n.op != Oind)
fatal("pickdupcom not Oind: " + nodeconv(n));
t := n.ty;
nlab := t.decl.tag;
#
# generate global which has case labels
#
d := mkids(src, enter(".c"+string nlabel++, 0), mktype(src.start, src.stop, Tcase, nil, nil), nil);
d.init = mkdeclname(src, d);
clab := ref znode;
clab.addable = Rmreg;
clab.left = nil;
clab.right = nil;
clab.op = Oname;
clab.ty = d.ty;
clab.decl = d;
#
# generate a temp to hold the real value
# then generate a case on the tag
#
orig := n.left;
tmp := talloc(orig.ty, nil);
ecom(src, tmp, orig);
orig = mkunary(Oind, tmp);
orig.ty = tint;
sumark(orig);
dest := mkunary(Oind, nto);
dest.ty = nto.ty.tof;
sumark(dest);
genrawop(src, ICASE, orig, nil, clab);
labs := array[nlab] of Label;
i := 0;
jmps = nil;
for(tg := t.tags; tg != nil; tg = tg.next){
stg := tg;
for(; tg.next != nil; tg = tg.next)
if(stg.ty != tg.next.ty)
break;
start := sumark(simplify(mkdeclname(src, stg)));
stop := start;
node := start;
if(stg != tg){
stop = sumark(simplify(mkdeclname(src, tg)));
node = mkbin(Orange, start, stop);
}
labs[i].start = start;
labs[i].stop = stop;
labs[i].node = node;
labs[i++].inst = nextinst();
genrawop(src, INEW, mktn(tg.ty.tof), nil, nto);
genmove(src, Mas, tg.ty.tof, orig, dest);
j := genrawop(src, IJMP, nil, nil, nil);
j.branch = jmps;
jmps = j;
}
#
# this should really be a runtime error
#
wild := genrawop(src, IJMP, nil, nil, nil);
patch(wild, wild);
patch(jmps, nextinst());
tfree(tmp);
if(i > nlab)
fatal("overflowed label tab for pickdupcom");
c := ref Case;
c.nlab = i;
c.nsnd = 0;
c.labs = labs;
c.iwild = wild;
d.ty.cse = c;
usetype(d.ty);
installids(Dglobal, d);
}
#
# see if name n occurs anywhere in e
#
tupaliased(n, e: ref Node): int
{
for(;;){
if(e == nil)
return 0;
if(e.op == Oname && e.decl == n.decl)
return 1;
if(tupaliased(n, e.left))
return 1;
e = e.right;
}
return 0;
}
#
# see if any name in n occurs anywere in e
#
tupsaliased(n, e: ref Node): int
{
for(;;){
if(n == nil)
return 0;
if(n.op == Oname && tupaliased(n, e))
return 1;
if(tupsaliased(n.left, e))
return 1;
n = n.right;
}
return 0;
}
#
# put unaddressable constants in the global data area
#
globalconst(n: ref Node): ref Decl
{
s := enter(".i." + hex(int n.c.val, 8), 0);
d := s.decl;
if(d == nil){
d = mkids(n.src, s, tint, nil);
installids(Dglobal, d);
d.init = n;
d.refs++;
}
return d;
}
globalBconst(n: ref Node): ref Decl
{
s := enter(".B." + bhex(n.c.val, 16), 0);
d := s.decl;
if(d == nil){
d = mkids(n.src, s, tbig, nil);
installids(Dglobal, d);
d.init = n;
d.refs++;
}
return d;
}
globalbconst(n: ref Node): ref Decl
{
s := enter(".b." + hex(int n.c.val & 16rff, 2), 0);
d := s.decl;
if(d == nil){
d = mkids(n.src, s, tbyte, nil);
installids(Dglobal, d);
d.init = n;
d.refs++;
}
return d;
}
globalfconst(n: ref Node): ref Decl
{
ba := array[8] of byte;
export_real(ba, array[] of {n.c.rval});
fs := ".f.";
for(i := 0; i < 8; i++)
fs += hex(int ba[i], 2);
if(fs != ".f." + bhex(math->realbits64(n.c.rval), 16))
fatal("bad globalfconst number");
s := enter(fs, 0);
d := s.decl;
if(d == nil){
d = mkids(n.src, s, treal, nil);
installids(Dglobal, d);
d.init = n;
d.refs++;
}
return d;
}
globalsconst(n: ref Node): ref Decl
{
s := n.decl.sym;
n.decl = nil;
d := s.decl;
if(d == nil){
d = mkids(n.src, s, tstring, nil);
installids(Dglobal, d);
d.init = n;
}
d.refs++;
n.decl = d;
return d;
}
#
# make a global of type t
# used to make initialized data
#
globalztup(t: ref Type): ref Decl
{
z := ".z." + string t.size + ".";
desc := t.decl.desc;
for(i := 0; i < desc.nmap; i++)
z += hex(int desc.map[i], 2);
s := enter(z, 0);
d := s.decl;
if(d == nil){
d = mkids(t.src, s, t, nil);
installids(Dglobal, d);
d.init = nil;
}
d.refs++;
return d;
}
subst(d: ref Decl, e: ref Node, n: ref Node): ref Node
{
if(n == nil)
return nil;
if(n.op == Oname){
if(d == n.decl){
n = dupn(0, nosrc, e);
n.ty = d.ty;
}
return n;
}
n.left = subst(d, e, n.left);
n.right = subst(d, e, n.right);
return n;
}
inline(n: ref Node): ref Node
{
e, tn: ref Node;
t: ref Type;
d: ref Decl;
if(debug['z']) sys->print("inline1: %s\n", nodeconv(n));
if(n.left.op == Oname)
d = n.left.decl;
else
d = n.left.right.decl;
e = d.init;
t = e.ty;
e = dupn(1, n.src, e.right.left.left);
n = n.right;
for(d = t.ids; d != nil && n != nil; d = d.next){
if(hasside(n.left, 0) && occurs(d, e) != 1){
tn = talloc(d.ty, nil);
e = mkbin(Ocomma, mkbin(Oas, tn, n.left), subst(d, tn, e));
e.ty = e.right.ty;
e.left.ty = d.ty;
}
else
e = subst(d, n.left, e);
n = n.right;
}
if(d != nil || n != nil)
fatal("bad arg match in inline()");
if(debug['z']) sys->print("inline2: %s\n", nodeconv(e));
return e;
}
fpcall(src: Src, op: int, n: ref Node, ret: ref Node)
{
tp, e, mod, ind: ref Node;
e = n.left.left;
if(e.addable >= Rcant)
(e, tp) = eacom(e, nil);
mod = mkunary(Oind, e);
ind = mkunary(Oind, mkbin(Oadd, dupn(0, src, e), mkconst(src, big IBY2WD)));
n.left = mkbin(Omdot, mod, ind);
n.left.ty = e.ty.tof;
mod.ty = ind.ty = ind.left.ty = ind.left.right.ty = tint;
sumark(n);
callcom(src, op, n, ret);
tfree(tp);
}