ref: a411870ee4640241e3c494367d922847da84f972
dir: /appl/cmd/limbo/stubs.b/
#
# write out some stub C code for limbo modules
#
emit(globals: ref Decl)
{
for(m := globals; m != nil; m = m.next){
if(m.store != Dtype || m.ty.kind != Tmodule)
continue;
m.ty = usetype(m.ty);
for(d := m.ty.ids; d != nil; d = d.next){
d.ty = usetype(d.ty);
if(d.store == Dglobal || d.store == Dfn)
modrefable(d.ty);
if(d.store == Dtype && d.ty.kind == Tadt){
for(id := d.ty.ids; id != nil; id = id.next){
id.ty = usetype(id.ty);
modrefable(d.ty);
}
}
}
}
if(emitstub){
adtstub(globals);
modstub(globals);
}
if(emittab != nil)
modtab(globals);
if(emitcode != nil)
modcode(globals);
if(emitsbl != nil)
modsbl(globals);
}
modsbl(globals: ref Decl)
{
for(d := globals; d != nil; d = d.next)
if(d.store == Dtype && d.ty.kind == Tmodule && d.sym.name == emitsbl)
break;
if(d == nil)
return;
bsym = bufio->fopen(sys->fildes(1), Bufio->OWRITE);
sblmod(d);
sblfiles();
n := 0;
genstart();
for(id := d.ty.tof.ids; id != nil; id = id.next){
if(id.sym.name == ".mp")
continue;
pushblock();
id.pc = genrawop(id.src, INOP, nil, nil, nil);
id.pc.pc = n++;
popblock();
}
firstinst = firstinst.next;
sblinst(firstinst, n);
# (adts, nadts) := findadts(globals);
sblty(adts, nadts);
fs := array[n] of ref Decl;
n = 0;
for(id = d.ty.tof.ids; id != nil; id = id.next){
if(id.sym.name == ".mp")
continue;
fs[n] = id;
n++;
}
sblfn(fs, n);
sblvar(nil);
}
lowercase(f: string): string
{
for(i := 0; i < len f; i++)
if(f[i] >= 'A' && f[i] <= 'Z')
f[i] += 'a' - 'A';
return f;
}
modcode(globals: ref Decl)
{
buf: string;
if(emitdyn){
buf = lowercase(emitcode);
print("#include \"%s.h\"\n", buf);
}
else{
print("#include <lib9.h>\n");
print("#include <isa.h>\n");
print("#include <interp.h>\n");
print("#include \"%smod.h\"\n", emitcode);
}
print("\n");
for(d := globals; d != nil; d = d.next)
if(d.store == Dtype && d.ty.kind == Tmodule && d.sym.name == emitcode)
break;
if(d == nil)
return;
#
# stub types
#
for(id := d.ty.ids; id != nil; id = id.next){
if(id.store == Dtype && id.ty.kind == Tadt){
id.ty = usetype(id.ty);
print("Type*\tT_%s;\n", id.sym.name);
}
}
#
# type maps
#
if(emitdyn){
for(id = d.ty.ids; id != nil; id = id.next)
if(id.store == Dtype && id.ty.kind == Tadt)
print("uchar %s_map[] = %s_%s_map;\n",
id.sym.name, emitcode, id.sym.name);
}
#
# heap allocation and garbage collection for a type
#
if(emitdyn){
for(id = d.ty.ids; id != nil; id = id.next)
if(id.store == Dtype && id.ty.kind == Tadt){
print("\n%s_%s*\n%salloc%s(void)\n{\n\tHeap *h;\n\n\th = heap(T_%s);\n\treturn H2D(%s_%s*, h);\n}\n", emitcode, id.sym.name, emitcode, id.sym.name, id.sym.name, emitcode, id.sym.name);
print("\nvoid\n%sfree%s(Heap *h, int swept)\n{\n\t%s_%s *d;\n\n\td = H2D(%s_%s*, h);\n\tfreeheap(h, swept);\n}\n", emitcode, id.sym.name, emitcode, id.sym.name, emitcode, id.sym.name);
}
}
#
# initialization function
#
if(emitdyn)
print("\nvoid\n%sinit(void)\n{\n", emitcode);
else{
print("\nvoid\n%smodinit(void)\n{\n", emitcode);
print("\tbuiltinmod(\"$%s\", %smodtab, %smodlen);\n", emitcode, emitcode, emitcode);
}
for(id = d.ty.ids; id != nil; id = id.next)
if(id.store == Dtype && id.ty.kind == Tadt){
if(emitdyn)
print("\tT_%s = dtype(%sfree%s, %s_%s_size, %s_map, sizeof(%s_map));\n",
id.sym.name, emitcode, id.sym.name, emitcode, id.sym.name, id.sym.name, id.sym.name);
else
print("\tT_%s = dtype(freeheap, sizeof(%s), %smap, sizeof(%smap));\n",
id.sym.name, id.sym.name, id.sym.name, id.sym.name);
}
print("}\n");
#
# end function
#
if(emitdyn){
print("\nvoid\n%send(void)\n{\n", emitcode);
for(id = d.ty.ids; id != nil; id = id.next)
if(id.store == Dtype && id.ty.kind == Tadt)
print("\tfreetype(T_%s);\n", id.sym.name);
print("}\n");
}
#
# stub functions
#
for(id = d.ty.tof.ids; id != nil; id = id.next){
print("\nvoid\n%s_%s(void *fp)\n{\n\tF_%s_%s *f = fp;\n",
id.dot.sym.name, id.sym.name,
id.dot.sym.name, id.sym.name);
if(id.ty.tof != tnone && tattr[id.ty.tof.kind].isptr){
print("\tvoid *r;\n");
print("\n\tr = *f->ret;\n\t*f->ret = H;\n\tdestroy(r);\n");
}
print("}\n");
}
if(emitdyn)
print("\n#include \"%smod.h\"\n", buf);
}
modtab(globals: ref Decl)
{
print("typedef struct{char *name; long sig; void (*fn)(void*); int size; int np; uchar map[16];} Runtab;\n");
for(d := globals; d != nil; d = d.next){
if(d.store == Dtype && d.ty.kind == Tmodule && d.sym.name == emittab){
n := 0;
print("Runtab %smodtab[]={\n", d.sym.name);
for(id := d.ty.tof.ids; id != nil; id = id.next){
n++;
print("\t\"");
if(id.dot != d)
print("%s.", id.dot.sym.name);
print("%s\",0x%ux,%s_%s,", id.sym.name, sign(id),
id.dot.sym.name, id.sym.name);
if(id.ty.varargs != byte 0)
print("0,0,{0},");
else{
md := mkdesc(idoffsets(id.ty.ids, MaxTemp, MaxAlign), id.ty.ids);
print("%d,%d,%s,", md.size, md.nmap, mapconv(md));
}
print("\n");
}
print("\t0\n};\n");
print("#define %smodlen %d\n", d.sym.name, n);
}
}
}
#
# produce activation records for all the functions in modules
#
modstub(globals: ref Decl)
{
for(d := globals; d != nil; d = d.next){
if(d.store != Dtype || d.ty.kind != Tmodule)
continue;
arg := 0;
for(id := d.ty.tof.ids; id != nil; id = id.next){
s := id.dot.sym.name + "_" + id.sym.name;
if(emitdyn && id.dot.dot != nil)
s = id.dot.dot.sym.name + "_" + s;
print("void %s(void*);\ntypedef struct F_%s F_%s;\nstruct F_%s\n{\n",
s, s, s, s);
print(" WORD regs[NREG-1];\n");
if(id.ty.tof != tnone)
print(" %s* ret;\n", ctypeconv(id.ty.tof));
else
print(" WORD noret;\n");
print(" uchar temps[%d];\n", MaxTemp-NREG*IBY2WD);
offset := MaxTemp;
for(m := id.ty.ids; m != nil; m = m.next){
p := "";
if(m.sym != nil)
p = m.sym.name;
else
p = "arg"+string arg;
#
# explicit pads for structure alignment
#
t := m.ty;
(offset, nil) = stubalign(offset, t.align, nil);
if(offset != m.offset)
yyerror("module stub must not contain data objects");
# fatal("modstub bad offset");
print(" %s %s;\n", ctypeconv(t), p);
arg++;
offset += t.size;
#ZZZ need to align?
}
if(id.ty.varargs != byte 0)
print(" WORD vargs;\n");
print("};\n");
}
for(id = d.ty.ids; id != nil; id = id.next)
if(id.store == Dconst)
constub(id);
}
}
chanstub(in: string, id: ref Decl)
{
print("typedef %s %s_%s;\n", ctypeconv(id.ty.tof), in, id.sym.name);
desc := mktdesc(id.ty.tof);
print("#define %s_%s_size %d\n", in, id.sym.name, desc.size);
print("#define %s_%s_map %s\n", in, id.sym.name, mapconv(desc));
}
#
# produce c structs for all adts
#
adtstub(globals: ref Decl)
{
t, tt: ref Type;
m, d, id: ref Decl;
for(m = globals; m != nil; m = m.next){
if(m.store != Dtype || m.ty.kind != Tmodule)
continue;
for(d = m.ty.ids; d != nil; d = d.next){
if(d.store != Dtype)
continue;
t = usetype(d.ty);
d.ty = t;
s := dotprint(d.ty.decl, '_');
case d.ty.kind{
Tadt =>
print("typedef struct %s %s;\n", s, s);
Tint or
Tbyte or
Treal or
Tbig or
Tfix =>
print("typedef %s %s;\n", ctypeconv(t), s);
}
}
}
for(m = globals; m != nil; m = m.next){
if(m.store != Dtype || m.ty.kind != Tmodule)
continue;
for(d = m.ty.ids; d != nil; d = d.next){
if(d.store != Dtype)
continue;
t = d.ty;
if(t.kind == Tadt || t.kind == Ttuple && t.decl.sym != anontupsym){
if(t.tags != nil){
pickadtstub(t);
continue;
}
s := dotprint(t.decl, '_');
print("struct %s\n{\n", s);
offset := 0;
for(id = t.ids; id != nil; id = id.next){
if(id.store == Dfield){
tt = id.ty;
(offset, nil) = stubalign(offset, tt.align, nil);
if(offset != id.offset)
fatal("adtstub bad offset");
print(" %s %s;\n", ctypeconv(tt), id.sym.name);
offset += tt.size;
}
}
if(t.ids == nil){
print(" char dummy[1];\n");
offset = 1;
}
(offset, nil)= stubalign(offset, t.align, nil);
#ZZZ
(offset, nil) = stubalign(offset, IBY2WD, nil);
if(offset != t.size && t.ids != nil)
fatal("adtstub: bad size");
print("};\n");
for(id = t.ids; id != nil; id = id.next)
if(id.store == Dconst)
constub(id);
for(id = t.ids; id != nil; id = id.next)
if(id.ty.kind == Tchan)
chanstub(s, id);
desc := mktdesc(t);
if(offset != desc.size && t.ids != nil)
fatal("adtstub: bad desc size");
print("#define %s_size %d\n", s, offset);
print("#define %s_map %s\n", s, mapconv(desc));
#ZZZ
if(0)
print("struct %s_check {int s[2*(sizeof(%s)==%s_size)-1];};\n", s, s, s);
}else if(t.kind == Tchan)
chanstub(m.sym.name, d);
}
}
}
#
# emit an expicit pad field for aligning emitted c structs
# according to limbo's definition
#
stubalign(offset: int, a: int, s: string): (int, string)
{
x := offset & (a-1);
if(x == 0)
return (offset, s);
x = a - x;
if(s != nil)
s += sprint("uchar\t_pad%d[%d]; ", offset, x);
else
print("\tuchar\t_pad%d[%d];\n", offset, x);
offset += x;
if((offset & (a-1)) || x >= a)
fatal("compiler stub misalign");
return (offset, s);
}
constub(id: ref Decl)
{
s := id.dot.sym.name + "_" + id.sym.name;
case id.ty.kind{
Tbyte =>
print("#define %s %d\n", s, int id.init.c.val & 16rff);
Tint or
Tfix =>
print("#define %s %d\n", s, int id.init.c.val);
Tbig =>
print("#define %s %bd\n", s, id.init.c.val);
Treal =>
print("#define %s %g\n", s, id.init.c.rval);
Tstring =>
print("#define %s \"%s\"\n", s, id.init.decl.sym.name);
}
}
mapconv(d: ref Desc): string
{
s := "{";
for(i := 0; i < d.nmap; i++)
s += "0x" + hex(int d.map[i], 0) + ",";
if(i == 0)
s += "0";
s += "}";
return s;
}
dotprint(d: ref Decl, dot: int): string
{
s : string;
if(d.dot != nil){
s = dotprint(d.dot, dot);
s[len s] = dot;
}
if(d.sym == nil)
return s;
return s + d.sym.name;
}
ckindname := array[Tend] of
{
Tnone => "void",
Tadt => "struct",
Tadtpick => "?adtpick?",
Tarray => "Array*",
Tbig => "LONG",
Tbyte => "BYTE",
Tchan => "Channel*",
Treal => "REAL",
Tfn => "?fn?",
Tint => "WORD",
Tlist => "List*",
Tmodule => "Modlink*",
Tref => "?ref?",
Tstring => "String*",
Ttuple => "?tuple?",
Texception => "?exception",
Tfix => "WORD",
Tpoly => "void*",
Tainit => "?ainit?",
Talt => "?alt?",
Tany => "void*",
Tarrow => "?arrow?",
Tcase => "?case?",
Tcasel => "?casel?",
Tcasec => "?casec?",
Tdot => "?dot?",
Terror => "?error?",
Tgoto => "?goto?",
Tid => "?id?",
Tiface => "?iface?",
Texcept => "?except?",
Tinst => "?inst?",
};
ctypeconv(t: ref Type): string
{
if(t == nil)
return "void";
s := "";
case t.kind{
Terror =>
return "type error";
Tref =>
s = ctypeconv(t.tof);
s += "*";
Tarray or
Tlist or
Tint or
Tbig or
Tstring or
Treal or
Tbyte or
Tnone or
Tany or
Tchan or
Tmodule or
Tfix or
Tpoly =>
return ckindname[t.kind];
Tadtpick =>
return ctypeconv(t.decl.dot.ty);
Tadt or
Ttuple =>
if(t.decl.sym != anontupsym)
return dotprint(t.decl, '_');
s += "struct{ ";
offset := 0;
for(id := t.ids; id != nil; id = id.next){
tt := id.ty;
(offset, s) = stubalign(offset, tt.align, s);
if(offset != id.offset)
fatal("ctypeconv tuple bad offset");
s += ctypeconv(tt);
s += " ";
s += id.sym.name;
s += "; ";
offset += tt.size;
}
(offset, s) = stubalign(offset, t.align, s);
if(offset != t.size)
fatal(sprint("ctypeconv tuple bad t=%s size=%d offset=%d", typeconv(t), t.size, offset));
s += "}";
* =>
fatal("no C equivalent for type " + string t.kind);
}
return s;
}
pickadtstub(t: ref Type)
{
tt: ref Type;
desc: ref Desc;
id, tg: ref Decl;
ok: byte;
offset, tgoffset: int;
buf := dotprint(t.decl, '_');
offset = 0;
for(tg = t.tags; tg != nil; tg = tg.next)
print("#define %s_%s %d\n", buf, tg.sym.name, offset++);
print("struct %s\n{\n", buf);
print(" int pick;\n");
offset = IBY2WD;
for(id = t.ids; id != nil; id = id.next){
if(id.store == Dfield){
tt = id.ty;
(offset, nil) = stubalign(offset, tt.align, nil);
if(offset != id.offset)
fatal("pickadtstub bad offset");
print(" %s %s;\n", ctypeconv(tt), id.sym.name);
offset += tt.size;
}
}
print(" union{\n");
for(tg = t.tags; tg != nil; tg = tg.next){
tgoffset = offset;
print(" struct{\n");
for(id = tg.ty.ids; id != nil; id = id.next){
if(id.store == Dfield){
tt = id.ty;
(tgoffset, nil) = stubalign(tgoffset, tt.align, nil);
if(tgoffset != id.offset)
fatal("pickadtstub bad offset");
print(" %s %s;\n", ctypeconv(tt), id.sym.name);
tgoffset += tt.size;
}
}
if(tg.ty.ids == nil)
print(" char dummy[1];\n");
print(" } %s;\n", tg.sym.name);
}
print(" } u;\n");
print("};\n");
for(id = t.ids; id != nil; id = id.next)
if(id.store == Dconst)
constub(id);
for(id = t.ids; id != nil; id = id.next)
if(id.ty.kind == Tchan)
chanstub(buf, id);
for(tg = t.tags; tg != nil; tg = tg.next){
ok = tg.ty.tof.ok;
tg.ty.tof.ok = OKverify;
sizetype(tg.ty.tof);
tg.ty.tof.ok = OKmask;
desc = mktdesc(tg.ty.tof);
tg.ty.tof.ok = ok;
print("#define %s_%s_size %d\n", buf, tg.sym.name, tg.ty.size);
print("#define %s_%s_map %s\n", buf, tg.sym.name, mapconv(desc));
}
}