ref: db3b70f1424dfd8c5ea45206790df066c53bfab0
dir: /appl/lib/debug.b/
implement Debug;
include "sys.m";
sys: Sys;
sprint, FD: import sys;
include "string.m";
str: String;
include "draw.m";
include "debug.m";
include "dis.m";
dism: Dis;
Command: module
{
init: fn(ctxt: ref Draw->Context, argv: list of string);
};
Spin: adt
{
spin: int;
pspin: int;
};
SrcState: adt
{
files: array of string;
lastf: int;
lastl: int;
vers: int; # version number
# 11 => more source states
};
typenames := array[] of {
Terror => "error",
Tid => "id",
Tadt => "adt",
Tadtpick => "adtpick",
Tarray => "array",
Tbig => "big",
Tbyte => "byte",
Tchan => "chan",
Treal => "real",
Tfn => "fn",
Targ => "arg",
Tlocal => "local",
Tglobal => "global",
Tint => "int",
Tlist => "list",
Tmodule => "module",
Tnil => "nil",
Tnone => "none",
Tref => "ref",
Tstring => "string",
Ttuple => "tuple",
Tend => "end",
Targs => "args",
Tslice => "slice",
Tpoly => "poly",
};
tnone: ref Type;
tnil: ref Type;
tint: ref Type;
tbyte: ref Type;
tbig: ref Type;
treal: ref Type;
tstring: ref Type;
tpoly: ref Type;
IBY2WD: con 4;
IBY2LG: con 8;
H: con int 16rffffffff;
ModHash: con 32;
SymHash: con 32;
mods:= array[ModHash] of list of ref Module;
syms:= array[SymHash] of list of ref Sym;
sblpath := array[] of
{
("/dis/", "/appl/cmd/"),
("/dis/", "/appl/"),
};
init(): int
{
sys = load Sys Sys->PATH;
str = load String String->PATH;
if(sys == nil || str == nil)
return 0;
tnone = ref Type(nil, Tnone, 0, "", nil, nil, nil);
tnil = ref Type(nil, Tnil, IBY2WD, "nil", nil, nil, nil);
tint = ref Type(nil, Tint, IBY2WD, "int", nil, nil, nil);
tbyte = ref Type(nil, Tbyte, 1, "byte", nil, nil, nil);
tbig = ref Type(nil, Tbig, IBY2LG, "big", nil, nil, nil);
treal = ref Type(nil, Treal, IBY2LG, "real", nil, nil, nil);
tstring = ref Type(nil, Tstring, IBY2WD, "string", nil, nil, nil);
tpoly = ref Type(nil, Tpoly, IBY2WD, "polymorphic", nil, nil, nil);
return 1;
}
prog(pid: int): (ref Prog, string)
{
spid := string pid;
h := sys->open("/prog/"+spid+"/heap", sys->ORDWR);
if(h == nil)
return (nil, sprint("can't open heap file: %r"));
c := sys->open("/prog/"+spid+"/ctl", sys->OWRITE);
if(c == nil)
return (nil, sprint("can't open ctl file: %r"));
d := sys->open("/prog/"+spid+"/dbgctl", sys->ORDWR);
if(d == nil)
return (nil, sprint("can't open debug ctl file: %r"));
s := sys->open("/prog/"+spid+"/stack", sys->OREAD);
if(s == nil)
return (nil, sprint("can't open stack file: %r"));
return (ref Prog(pid, h, c, d, s), "");
}
startprog(dis, dir: string, ctxt: ref Draw->Context, argv: list of string): (ref Prog, string)
{
c := load Command dis;
if(c == nil)
return (nil, "module not loaded");
ack := chan of int;
spin := ref Spin(1, 1);
end := chan of int;
spawn execer(ack, dir, c, ctxt, argv, spin, end);
kid := <-ack;
fd := sys->open("/prog/"+string kid+"/dbgctl", sys->ORDWR);
if(fd == nil){
spin.spin = -1;
<- end;
return (nil, sprint("can't open debug ctl file: %r"));
}
done := chan of string;
spawn stepper(done, fd, spin);
wait: for(;;){
alt{
<-ack =>
sys->sleep(0);
err := <-done =>
if(err != ""){
<- end;
return(nil, err);
}
break wait;
}
}
b := array[20] of byte;
n := sys->read(fd, b, len b);
if(n <= 0){
<- end;
return(nil, sprint("%r"));
}
msg := string b[:n];
if(!str->prefix("new ", msg)){
<- end;
return (nil, msg);
}
kid = int msg[len "new ":];
# clean up the execer slave
b = array of byte "start";
sys->write(fd, b, len b);
<- end;
return prog(kid);
}
stepper(done: chan of string, ctl: ref FD, spin: ref Spin)
{
b := array of byte "step1";
while(spin.pspin){
if(sys->write(ctl, b, len b) != len b)
done <-= sprint("can't start new thread: %r");
spin.spin = 0;
}
done <-= "";
}
execer(ack: chan of int, dir: string, c: Command, ctxt: ref Draw->Context, args: list of string, spin: ref Spin, end: chan of int)
{
pid := sys->pctl(Sys->NEWPGRP|Sys->FORKNS|Sys->NEWFD, 0::1::2::nil);
sys->chdir(dir);
while(spin.spin == 1)
ack <-= pid;
if(spin.spin == -1){
end <-= 0;
exit;
}
spawn c->init(ctxt, args);
spin.pspin = 0;
end <-= 0;
exit;
}
# format of each line is
# fp pc mp prog compiled path
# fp, pc, mp, and prog are %.8lux
# compile is or 1
# path is a string
Prog.stack(p: self ref Prog): (array of ref Exp, string)
{
buf := array[8192] of byte;
sys->seek(p.stk, big 0, 0);
n := sys->read(p.stk, buf, len buf - 1);
if(n < 0)
return (nil, sprint("can't read stack file: %r"));
buf[n] = byte 0;
t := 0;
nf := 0;
for(s := 0; s < n; s = t+1){
t = strchr(buf, s, '\n');
if(buf[t] != byte '\n' || t-s < 40)
continue;
nf++;
}
e := array[nf] of ref Exp;
nf = 0;
for(s = 0; s < n; s = t+1){
t = strchr(buf, s, '\n');
if(buf[t] != byte '\n' || t-s < 40)
continue;
e[nf] = ref Exp("unknown fn",
hex(buf[s+0:s+8]),
hex(buf[s+9:s+17]),
mkmod(hex(buf[s+18:s+26]), hex(buf[s+27:s+35]), buf[36] != byte '0', string buf[s+38:t]),
p,
nil);
nf++;
}
return (e, "");
}
Prog.step(p: self ref Prog, how: int): string
{
(stack, nil) := p.stack();
if(stack == nil)
return "can't find initial pc";
src := stack[0].srcstr();
stmt := ftostmt(stack[0]);
if(stack[0].m.sym == nil)
how = -1;
buf := array of byte("step1");
if(how == StepOut)
buf = array of byte("toret");
while(sys->write(p.dbgctl, buf, len buf) == len buf){
(stk, err) := p.stack();
if(err != nil)
return "";
case how{
StepExp =>
if(src != stk[0].srcstr())
return "";
StepStmt =>
if(stmt != ftostmt(stk[0]))
return "";
if(stk[0].offset != stack[0].offset)
return "";
StepOut =>
if(returned(stack, stk))
return "";
StepOver =>
if(stk[0].offset == stack[0].offset){
if(stmt != ftostmt(stk[0]))
return "";
buf = array of byte("step1");
break;
}
if(returned(stack, stk))
return "";
buf = array of byte("toret");
* =>
return "";
}
}
return sprint("%r");
}
Prog.stop(p: self ref Prog): string
{
return dbgctl(p, "stop");
}
Prog.unstop(p: self ref Prog): string
{
return dbgctl(p, "unstop");
}
Prog.grab(p: self ref Prog): string
{
return dbgctl(p, "step0");
}
Prog.start(p: self ref Prog): string
{
return dbgctl(p, "start");
}
Prog.cont(p: self ref Prog): string
{
return dbgctl(p, "cont");
}
dbgctl(p: ref Prog, msg: string): string
{
b := array of byte msg;
while(sys->write(p.dbgctl, b, len b) != len b)
return sprint("%r");
return "";
}
returned(old, new: array of ref Exp): int
{
n := len old;
if(n > len new)
return 1;
return 0;
}
Prog.setbpt(p: self ref Prog, dis: string, pc:int): string
{
b := array of byte("bpt set "+dis+" "+string pc);
if(sys->write(p.dbgctl, b, len b) != len b)
return sprint("can't set breakpoint: %r");
return "";
}
Prog.delbpt(p: self ref Prog, dis: string, pc:int): string
{
b := array of byte("bpt del "+dis+" "+string pc);
if(sys->write(p.dbgctl, b, len b) != len b)
return sprint("can't del breakpoint: %r");
return "";
}
Prog.kill(p: self ref Prog): string
{
b := array of byte "kill";
if(sys->write(p.ctl, b, len b) != len b)
return sprint("can't kill process: %r");
return "";
}
Prog.event(p: self ref Prog): string
{
b := array[100] of byte;
n := sys->read(p.dbgctl, b, len b);
if(n < 0)
return sprint("error: %r");
return string b[:n];
}
ftostmt(e: ref Exp): int
{
m := e.m;
if(!m.comp && m.sym != nil && e.pc < len m.sym.srcstmt)
return m.sym.srcstmt[e.pc];
return -1;
}
Exp.srcstr(e: self ref Exp): string
{
m := e.m;
if(!m.comp && m.sym != nil && e.pc < len m.sym.src){
src := m.sym.src[e.pc];
ss := src.start.file+":"+string src.start.line+"."+string src.start.pos+", ";
if(src.stop.file != src.start.file)
ss += src.stop.file+":"+string src.stop.line+".";
else if(src.stop.line != src.start.line)
ss += string src.stop.line+".";
return ss+string src.stop.pos;
}
return sprint("Module %s PC %d", e.m.path, e.pc);
}
Exp.findsym(e: self ref Exp): string
{
m := e.m;
if(m.comp)
return "compiled module";
if(m.sym != nil){
n := e.pc;
fns := m.sym.fns;
for(i := 0; i < len fns; i++){
if(n >= fns[i].offset && n < fns[i].stoppc){
e.name = fns[i].name;
e.id = fns[i];
return "";
}
}
return "pc out of bounds";
}
return "no symbol file";
}
Exp.src(e: self ref Exp): ref Src
{
m := e.m;
if(e.id == nil || m.sym == nil)
return nil;
src := e.id.src;
if(src != nil)
return src;
if(e.id.t.kind == Tfn && !m.comp && e.pc < len m.sym.src && e.pc >= 0)
return m.sym.src[e.pc];
return nil;
}
Type.getkind(t: self ref Type, sym: ref Sym): int
{
if(t == nil)
return -1;
if(t.kind == Tid)
return sym.adts[int t.name].getkind(sym);
return t.kind;
}
Type.text(t: self ref Type, sym: ref Sym): string
{
if (t == nil)
return "no type";
s := typenames[t.kind];
case t.kind {
Tadt or
Tadtpick or
Tmodule =>
s = t.name;
Tid =>
return sym.adts[int t.name].text(sym);
Tarray or
Tlist or
Tchan or
Tslice =>
s += " of " + t.Of.text(sym);
Tref =>
s += " " + t.Of.text(sym);
Tfn =>
s += "(";
for(i := 0; i < len t.ids; i++)
s += t.ids[i].name + ": " + t.ids[i].t.text(sym);
s += "): " + t.Of.text(sym);
Ttuple or
Tlocal or
Tglobal or
Targ =>
if(t.kind == Ttuple)
s = "";
s += "(";
for (i := 0; i < len t.ids; i++) {
s += t.ids[i].t.text(sym);
if (i < len t.ids - 1)
s += ", ";
}
s += ")";
}
return s;
}
Exp.typename(e: self ref Exp): string
{
if (e.id == nil)
return "no info";
return e.id.t.text(e.m.sym);
}
Exp.kind(e: self ref Exp): int
{
if(e.id == nil)
return -1;
return e.id.t.getkind(e.m.sym);
}
EXPLISTMAX : con 32; # what's a good value for this ?
Exp.expand(e: self ref Exp): array of ref Exp
{
if(e.id == nil)
return nil;
t := e.id.t;
if(t.kind == Tid)
t = e.m.sym.adts[int t.name];
off := e.offset;
ids := t.ids;
case t.kind{
Tadt or Tfn or Targ or Tlocal or Ttuple =>
break;
Tadtpick =>
break;
Tglobal =>
ids = e.m.sym.vars;
off = e.m.data;
Tmodule =>
(s, err) := pdata(e.p, off, "M");
if(s == "nil" || err != "")
return nil;
off = hex(array of byte s);
Tref =>
(s, err) := pdata(e.p, off, "P");
if(s == "nil" || err != "")
return nil;
off = hex(array of byte s);
et := t.Of;
if(et.kind == Tid)
et = e.m.sym.adts[int et.name];
ids = et.ids;
if(et.kind == Tadtpick){
(s, err) = pdata(e.p, off, "W");
tg := int s;
if(tg < 0 || tg > len et.tags || err != "" )
return nil;
k := array[1 + len ids + len et.tags[tg].ids] of ref Exp;
k[0] = ref Exp(et.tags[tg].name, off+0, e.pc, e.m, e.p, ref Id(et.src, et.tags[tg].name, 0, 0, tint));
x := 1;
for(i := 0; i < len ids; i++){
id := ids[i];
k[i+x] = ref Exp(id.name, off+id.offset, e.pc, e.m, e.p, id);
}
x += len ids;
ids = et.tags[tg].ids;
for(i = 0; i < len ids; i++){
id := ids[i];
k[i+x] = ref Exp(id.name, off+id.offset, e.pc, e.m, e.p, id);
}
return k;
}
Tlist =>
(s, err) := pdata(e.p, off, "L");
if(err != "")
return nil;
(tloff, hdoff) := str->splitl(s, ".");
hdoff = hdoff[1:];
k := array[2] of ref Exp;
k[0] = ref Exp("hd", hex(array of byte hdoff), e.pc, e.m, e.p, ref Id(nil, "hd", H, H, t.Of));
k[1] = ref Exp("tl", hex(array of byte tloff), e.pc, e.m, e.p, ref Id(nil, "tl", H, H, t));
return k;
Tarray =>
(s, nil) := pdata(e.p, e.offset, "A");
if(s == "nil")
return nil;
(sn, sa) := str->splitl(s, ".");
n := int sn;
if(sa == "" || n <= 0)
return nil;
(off, nil) = str->toint(sa[1:], 16);
et := t.Of;
if(et.kind == Tid)
et = e.m.sym.adts[int et.name];
esize := et.size;
if (n <= EXPLISTMAX || EXPLISTMAX == 0) {
k := array[n] of ref Exp;
for(i := 0; i < n; i++){
name := string i;
k[i] = ref Exp(name, off+i*esize, e.pc, e.m, e.p, ref Id(nil, name, H, H, et));
}
return k;
}
else {
# slice it
(p, q, r) := partition(n, EXPLISTMAX);
lb := 0;
k := array[p] of ref Exp;
st := ref Type(et.src, Tslice, 0, nil, et, nil, nil);
for (i := 0; i < p; i++){
ub := lb+q-1;
if (--r >= 0)
ub++;
name := string lb + ".." + string ub;
k[i] = ref Exp(name, off+lb*esize, e.pc, e.m, e.p, ref Id(nil, name, H, H, st));
lb = ub+1;
}
return k;
}
Tslice =>
(lb, ub) := bounds(e.name);
if (lb > ub)
return nil;
n := ub-lb+1;
et := t.Of;
if(et.kind == Tid)
et = e.m.sym.adts[int et.name];
esize := et.size;
if (n <= EXPLISTMAX || EXPLISTMAX == 0) {
k := array[n] of ref Exp;
for(i := 0; i < n; i++){
name := string (i+lb);
k[i] = ref Exp(name, off+i*esize, e.pc, e.m, e.p, ref Id(nil, name, H, H, et));
}
return k;
}
else {
# slice it again
(p, q, r) := partition(n, EXPLISTMAX);
lb0 := lb;
k := array[p] of ref Exp;
st := ref Type(et.src, Tslice, 0, nil, et, nil, nil);
for (i := 0; i < p; i++){
ub = lb+q-1;
if (--r >= 0)
ub++;
name := string lb + ".." + string ub;
k[i] = ref Exp(name, off+(lb-lb0)*esize, e.pc, e.m, e.p, ref Id(nil, name, H, H, st));
lb = ub+1;
}
return k;
}
Tchan =>
(s, nil) := pdata(e.p, e.offset, "c");
if(s == "nil")
return nil;
(sn, sa) := str->splitl(s, ".");
n := int sn;
if(sa == "" || n <= 0)
return nil;
(off, nil) = str->toint(sa[1:], 16);
(nil, sa) = str->splitl(sa[1:], ".");
(sn, sa) = str->splitl(sa[1:], ".");
f := int sn;
sz := int sa[1:];
et := t.Of;
if(et.kind == Tid)
et = e.m.sym.adts[int et.name];
esize := et.size;
k := array[sz] of ref Exp;
for(i := 0; i < sz; i++){
name := string i;
j := (f+i)%n;
k[i] = ref Exp(name, off+j*esize, e.pc, e.m, e.p, ref Id(nil, name, H, H, et));
}
return k;
* =>
return nil;
}
k := array[len ids] of ref Exp;
for(i := 0; i < len k; i++){
id := ids[i];
k[i] = ref Exp(id.name, off+id.offset, e.pc, e.m, e.p, id);
}
return k;
}
Exp.val(e: self ref Exp): (string, int)
{
if(e.id == nil)
return (e.m.path+" unknown fn", 0);
t := e.id.t;
if(t.kind == Tid)
t = e.m.sym.adts[int t.name];
w := 0;
s := "";
err := "";
p := e.p;
case t.kind{
Tfn =>
if(t.ids != nil)
w = 1;
src := e.m.sym.src[e.pc];
ss := src.start.file+":"+string src.start.line+"."+string src.start.pos+", ";
if(src.stop.file != src.start.file)
ss += src.stop.file+":"+string src.stop.line+".";
else if(src.stop.line != src.start.line)
ss += string src.stop.line+".";
return (ss+string src.stop.pos, w);
Targ or Tlocal or Tglobal or Tadtpick or Ttuple =>
return ("", 1);
Tadt =>
return ("#" + string e.offset, 1);
Tnil =>
s = "nil";
Tbyte =>
(s, err) = pdata(p, e.offset, "B");
Tint =>
(s, err) = pdata(p, e.offset, "W");
Tbig =>
(s, err) = pdata(p, e.offset, "V");
Treal =>
(s, err) = pdata(p, e.offset, "R");
Tarray =>
(s, err) = pdata(p, e.offset, "A");
if(s == "nil")
break;
(n, a) := str->splitl(s, ".");
if(a == "")
return ("", 0);
s = "["+n+"] @"+a[1:];
w = 1;
Tslice =>
(lb, ub) := bounds(e.name);
s = sys->sprint("[:%d] @ %x", ub-lb+1, e.offset);
w = 1;
Tstring =>
n : int;
(n, s, err) = pstring(p, e.offset);
if(err != "")
return ("", 0);
for(i := 0; i < len s; i++)
if(s[i] == '\n')
s[i] = '\u008a';
s = "["+string n+"] \""+s+"\"";
Tref or Tlist or Tmodule or Tpoly=>
(s, err) = pdata(p, e.offset, "P");
if(s == "nil")
break;
s = "@" + s;
w = 1;
Tchan =>
(s, err) = pdata(p, e.offset, "c");
if(s == "nil")
break;
(n, a) := str->splitl(s, ".");
if(a == "")
return ("", 0);
if(n == "0"){
s = "@" + a[1:];
w = 0;
}
else{
(a, nil) = str->splitl(a[1:], ".");
s = "["+n+"] @"+a;
w = 1;
}
}
if(err != "")
return ("", 0);
return (s, w);
}
Sym.srctopc(s: self ref Sym, src: ref Src): int
{
srcs := s.src;
line := src.start.line;
pos := src.start.pos;
(nil, file) := str->splitr(src.start.file, "/");
backup := -1;
delta := 80;
for(i := 0; i < len srcs; i++){
ss := srcs[i];
if(ss.start.file != file)
continue;
if(ss.start.line <= line && ss.start.pos <= pos
&& ss.stop.line >= line && ss.stop.pos >= pos)
return i;
d := ss.start.line - line;
if(d >= 0 && d < delta){
delta = d;
backup = i;
}
}
return backup;
}
Sym.pctosrc(s: self ref Sym, pc: int): ref Src
{
if(pc < 0 || pc >= len s.src)
return nil;
return s.src[pc];
}
sym(sbl: string): (ref Sym, string)
{
h := 0;
for(i := 0; i < len sbl; i++)
h = (h << 1) + sbl[i];
h &= SymHash - 1;
for(sl := syms[h]; sl != nil; sl = tl sl){
s := hd sl;
if(sbl == s.path)
return (s, "");
}
(sy, err) := loadsyms(sbl);
if(err != "")
return (nil, err);
syms[h] = sy :: syms[h];
return (sy, "");
}
Module.addsym(m: self ref Module, sym: ref Sym)
{
m.sym = sym;
}
Module.sbl(m: self ref Module): string
{
if(m.sym != nil)
return m.sym.path;
return "";
}
Module.dis(m: self ref Module): string
{
return m.path;
}
findsbl(dis: string): string
{
n := len dis;
if(n <= 4 || dis[n-4: n] != ".dis")
dis += ".dis";
if(dism == nil){
dism = load Dis Dis->PATH;
if(dism != nil)
dism->init();
}
if(dism != nil && (b := dism->src(dis)) != nil){
n = len b;
if(n > 2 && b[n-2: n] == ".b"){
sbl := b[0: n-2] + ".sbl";
if(sys->open(sbl, Sys->OREAD) != nil)
return sbl;
}
}
return nil;
}
Module.stdsym(m: self ref Module)
{
if(m.sym != nil)
return;
if((sbl := findsbl(m.path)) != nil){
(m.sym, nil) = sym(sbl);
return;
}
sbl = m.path;
n := len sbl;
if(n > 4 && sbl[n-4:n] == ".dis")
sbl = sbl[:n-4]+".sbl";
else
sbl = sbl+".sbl";
path := sbl;
fd := sys->open(sbl, sys->OREAD);
for(i := 0; fd == nil && i < len sblpath; i++){
(dis, src) := sblpath[i];
nd := len dis;
if(len sbl > nd && sbl[:nd] == dis){
path = src + sbl[nd:];
fd = sys->open(path, sys->OREAD);
}
}
if(fd == nil)
return;
(m.sym, nil) = sym(path);
}
mkmod(data, code, comp: int, dis: string): ref Module
{
h := 0;
for(i := 0; i < len dis; i++)
h = (h << 1) + dis[i];
h &= ModHash - 1;
sym : ref Sym;
for(ml := mods[h]; ml != nil; ml = tl ml){
m := hd ml;
if(m.path == dis && m.code == code && m.comp == comp){
sym = m.sym;
if(m.data == data)
return m;
}
}
m := ref Module(dis, code, data, comp, sym);
mods[h] = m :: mods[h];
return m;
}
pdata(p: ref Prog, a: int, fmt: string): (string, string)
{
b := array of byte sprint("0x%ux.%s1", a, fmt);
if(sys->write(p.heap, b, len b) != len b)
return ("", sprint("can't write heap: %r"));
buf := array[64] of byte;
sys->seek(p.heap, big 0, 0);
n := sys->read(p.heap, buf, len buf);
if(n <= 1)
return ("", sprint("can't read heap: %r"));
return (string buf[:n-1], "");
}
pstring0(p: ref Prog, a: int, blen: int): (int, string, string)
{
b := array of byte sprint("0x%ux.C1", a);
if(sys->write(p.heap, b, len b) != len b)
return (-1, "", sprint("can't write heap: %r"));
buf := array[blen] of byte;
sys->seek(p.heap, big 0, 0);
n := sys->read(p.heap, buf, len buf-1);
if(n <= 1)
return (-1, "", sprint("can't read heap: %r"));
buf[n] = byte 0;
m := strchr(buf, 0, '.');
if(buf[m++] != byte '.')
m = 0;
return (int string buf[0:m], string buf[m:n], "");
}
pstring(p: ref Prog, a: int): (int, string, string)
{
m, n: int;
s, err: string;
m = 64;
for(;;){
(n, s, err) = pstring0(p, a, m);
if(err != "" || n <= len s)
break;
# guard against broken devprog
if(m >= 3 * n)
return (-1, nil, "bad string");
m *= 2;
}
return (n, s, err);
}
Prog.status(p: self ref Prog): (int, string, string, string)
{
fd := sys->open(sprint("/prog/%d/status", p.id), sys->OREAD);
if(fd == nil)
return (-1, "", sprint("can't open status file: %r"), "");
buf := array[256] of byte;
n := sys->read(fd, buf, len buf);
if(n <= 0)
return (-1, "", sprint("can't read status file: %r"), "");
(ni, info) := sys->tokenize(string buf[:n], " \t");
if(ni != 6 && ni != 7)
return (-1, "", "can't parse status file", "");
info = tl info;
if(ni == 6)
return (int hd info, hd tl info, hd tl tl info, hd tl tl tl tl info);
return (int hd info, hd tl info, hd tl tl tl info, hd tl tl tl tl tl info);
}
loadsyms(sbl: string): (ref Sym, string)
{
fd := sys->open(sbl, sys->OREAD);
if(fd == nil)
return (nil, sprint("Can't open symbol file '%s': %r", sbl));
(ok, dir) := sys->fstat(fd);
if(ok < 0)
return (nil, sprint("Can't read symbol file '%s': %r", sbl));
n := int dir.length;
buf := array[n+1] of byte;
if(sys->read(fd, buf, n) != n)
return (nil, sprint("Can't read symbol file '%s': %r", sbl));
fd = nil;
buf[n] = byte 0;
s := ref Sym;
s.path = sbl;
n = strchr(buf, 0, '\n');
vers := 0;
if(string buf[:n] == "limbo .sbl 1.")
vers = 10;
else if(string buf[:n] == "limbo .sbl 1.1")
vers = 11;
else if(string buf[:n] == "limbo .sbl 2.0")
vers = 20;
else if(string buf[:n] == "limbo .sbl 2.1")
vers = 21;
else
return (nil, "Symbol file "+sbl+" out of date");
o := n += 1;
n = strchr(buf, o, '\n');
if(buf[n] != byte '\n')
return (nil, "Corrupted symbol file "+sbl);
s.name = string buf[o:n++];
ss := ref SrcState(nil, 0, 0, vers);
err : string;
if(n >= 0){
err = "file";
n = debugfiles(ss, buf, n);
}
if(n >= 0){
err = "pc";
n = debugpc(ss, s, buf, n);
}
if(n >= 0){
err = "types";
n = debugtys(ss, s, buf, n);
}
if(n >= 0){
err = "fn";
n = debugfns(ss, s, buf, n);
}
vs: array of ref Id;
if(n >= 0){
err = "global";
(vs, n) = debugid(ss, buf, n);
}
if(n < 0)
return (nil, "Corrupted "+err+" symbol table in "+sbl);
s.vars = vs;
return (s, "");
}
#
# parse a source location
# format[file:][line.]pos,[file:][line.]pos' '
#
debugsrc(ss: ref SrcState, buf: array of byte, p: int): (ref Src, int)
{
n: int;
src: ref Src;
(n, p) = strtoi(buf, p);
if(buf[p] == byte ':'){
ss.lastf = n;
(n, p) = strtoi(buf, p + 1);
}
if(buf[p] == byte '.'){
ss.lastl = n;
(n, p) = strtoi(buf, p + 1);
}
if(buf[p++] != byte ',' || ss.lastf >= len ss.files || ss.lastf < 0)
return (nil, -1);
src = ref Src;
src.start.file = ss.files[ss.lastf];
src.start.line = ss.lastl;
src.start.pos = n;
(n, p) = strtoi(buf, p);
if(buf[p] == byte ':'){
ss.lastf = n;
(n, p) = strtoi(buf, p+1);
}
if(buf[p] == byte '.'){
ss.lastl = n;
(n, p) = strtoi(buf, p + 1);
}
if(buf[p++] != byte ' ' || ss.lastf >= len ss.files || ss.lastf < 0)
return (nil, -1);
src.stop.file = ss.files[ss.lastf];
src.stop.line = ss.lastl;
src.stop.pos = n;
return (src, p);
}
#
# parse the file table
# item format: file: string
#
debugfiles(ss: ref SrcState, buf: array of byte, p: int): int
{
n, q: int;
(n, p) = strtoi(buf, p);
if(buf[p++] != byte '\n')
return -1;
ss.files = array[n] of string;
for(i := 0; i < n; i++){
q = strchr(buf, p, '\n');
ss.files[i] = string buf[p:q];
p = q + 1;
}
return p;
}
#
# parse the pc to source table
# item format: Source stmt
#
debugpc(ss: ref SrcState, s: ref Sym, buf: array of byte, p: int): int
{
ns: int;
(ns, p) = strtoi(buf, p);
if(buf[p++] != byte '\n')
return -1;
s.src = array[ns] of ref Src;
s.srcstmt = array[ns] of int;
for(i := 0; i < ns; i++){
(s.src[i], p) = debugsrc(ss, buf, p);
if(p < 0)
return -1;
(s.srcstmt[i], p) = strtoi(buf, p);
if(buf[p++] != byte '\n')
return -1;
}
return p;
}
#
# parse the type table
# format: linear list of types
#
debugtys(ss: ref SrcState, s: ref Sym, buf: array of byte, p: int): int
{
na: int;
(na, p) = strtoi(buf, p);
if(buf[p++] != byte '\n')
return -1;
s.adts = array[na] of ref Type;
adts := s.adts;
for(i := 0; i < na; i++){
if(ss.vers < 20)
(adts[i], p) = debugadt(ss, buf, p);
else
(adts[i], p) = debugtype(ss, buf, p);
if(p < 0)
return -1;
}
return p;
}
#
# parse the function table
# format: pc:name:argids localids rettype
#
debugfns(ss: ref SrcState, s: ref Sym, buf: array of byte, p: int): int
{
t: ref Type;
args, locals: array of ref Id;
nf, pc, q: int;
(nf, p) = strtoi(buf, p);
if(buf[p++] != byte '\n')
return -1;
s.fns = array[nf] of ref Id;
fns := s.fns;
for(i := 0; i < nf; i++){
(pc, p) = strtoi(buf, p);
if(buf[p++] != byte ':')
return -2;
q = strchr(buf, p, '\n');
if(buf[q] != byte '\n')
return -3;
name := string buf[p:q];
(args, p) = debugid(ss, buf, q + 1);
if(p == -1)
return -4;
(locals, p) = debugid(ss, buf, p);
if(p == -1)
return -5;
(t, p) = debugtype(ss, buf, p);
if(p == -1)
return -6;
nk := 1 + (len args != 0) + (len locals != 0);
kids := array[nk] of ref Id;
nk = 0;
if(len locals != 0)
kids[nk++] = ref Id(nil, "locals", 0, 0, ref Type(nil, Tlocal, 0, nil, nil, locals, nil));
if(len args != 0)
kids[nk++] = ref Id(nil, "args", 0, 0, ref Type(nil, Targ, 0, nil, nil, args, nil));
kids[nk++] = ref Id(nil, "module", 0, 0, ref Type(nil, Tglobal, 0, nil, nil, nil, nil));
args = nil;
locals = nil;
fns[i] = ref Id(nil, name, pc, 0, ref Type(nil, Tfn, 0, name, t, kids, nil));
}
for(i = 1; i < nf; i++)
fns[i-1].stoppc = fns[i].offset;
fns[i-1].stoppc = len s.src;
return p;
}
#
# parse a list of ids
# format: offset ':' name ':' src type '\n'
#
debugid(ss: ref SrcState, buf: array of byte, p: int): (array of ref Id, int)
{
t: ref Type;
off, nd, q, qq, tq: int;
src: ref Src;
(nd, p) = strtoi(buf, p);
if(buf[p++] != byte '\n')
return (nil, -1);
d := array[nd] of ref Id;
for(i := 0; i < nd; i++){
(off, q) = strtoi(buf, p);
if(buf[q++] != byte ':')
return (nil, -1);
qq = strchr(buf, q, ':');
if(buf[qq] != byte ':')
return (nil, -1);
tq = qq + 1;
if(ss.vers > 10){
(src, tq) = debugsrc(ss, buf, tq);
if(tq < 0)
return (nil, -1);
}
(t, p) = debugtype(ss, buf, tq);
if(p == -1 || buf[p++] != byte '\n')
return (nil, -1);
d[i] = ref Id(src, string buf[q:qq], off, 0, t);
}
return (d, p);
}
idlist(a: array of ref Id): list of ref Id
{
n := len a;
ids : list of ref Id = nil;
while(n-- > 0)
ids = a[n] :: ids;
return ids;
}
#
# parse a type description
#
debugtype(ss: ref SrcState, buf: array of byte, p: int): (ref Type, int)
{
t: ref Type;
d: array of ref Id;
q, k: int;
src: ref Src;
size := 0;
case int buf[p++]{
'@' =>
k = Tid;
'A' =>
k = Tarray;
size = IBY2WD;
'B' =>
return (tbig, p);
'C' => k = Tchan;
size = IBY2WD;
'L' =>
k = Tlist;
size = IBY2WD;
'N' =>
return (tnil, p);
'R' =>
k = Tref;
size = IBY2WD;
'a' =>
k = Tadt;
if(ss.vers < 20)
size = -1;
'b' =>
return (tbyte, p);
'f' =>
return (treal, p);
'i' =>
return (tint, p);
'm' =>
k = Tmodule;
size = IBY2WD;
'n' =>
return (tnone, p);
'p' =>
k = Tadtpick;
's' =>
return (tstring, p);
't' =>
k = Ttuple;
size = -1;
'F' =>
k = Tfn;
size = IBY2WD;
'P' =>
return (tpoly, p);
* =>
k = Terror;
}
if(size == -1){
q = strchr(buf, p, '.');
if(buf[q] == byte '.'){
size = int string buf[p:q];
p = q+1;
}
}
case k{
Tid =>
q = strchr(buf, p, '\n');
if(buf[q] != byte '\n')
return (nil, -1);
t = ref Type(nil, Tid, -1, string buf[p:q], nil, nil, nil);
p = q + 1;
Tadt =>
if(ss.vers < 20){
q = strchr(buf, p, '\n');
if(buf[q] != byte '\n')
return (nil, -1);
t = ref Type(nil, Tid, size, string buf[p:q], nil, nil, nil);
p = q + 1;
}else
(t, p) = debugadt(ss, buf, p);
Tadtpick =>
(t, p) = debugadt(ss, buf, p);
t.kind = Tadtpick;
(t.tags, p) = debugtag(ss, buf, p);
Tmodule =>
q = strchr(buf, p, '\n');
if(buf[q] != byte '\n')
return (nil, -1);
t = ref Type(nil, k, size, string buf[p:q], nil, nil, nil);
p = q + 1;
if(ss.vers > 10){
(src, p) = debugsrc(ss, buf, p);
t.src = src;
}
if(ss.vers > 20)
(t.ids, p) = debugid(ss, buf, p);
Tref or Tarray or Tlist or Tchan => # ref, array, list, chan
(t, p) = debugtype(ss, buf, p);
t = ref Type(nil, k, size, "", t, nil, nil);
Ttuple => # tuple
(d, p) = debugid(ss, buf, p);
t = ref Type(nil, k, size, "", nil, d, nil);
Tfn => # fn
(d, p) = debugid(ss, buf, p);
(t, p) = debugtype(ss, buf, p);
t = ref Type(nil, k, size, "", t, d, nil);
* =>
p = -1;
}
return (t, p);
}
#
# parse an adt type spec
# format: name ' ' src size '\n' ids
#
debugadt(ss: ref SrcState, buf: array of byte, p: int): (ref Type, int)
{
src: ref Src;
q := strchr(buf, p, ' ');
if(buf[q] != byte ' ')
return (nil, -1);
sq := q + 1;
if(ss.vers > 10){
(src, sq) = debugsrc(ss, buf, sq);
if(sq < 0)
return (nil, -1);
}
qq := strchr(buf, sq, '\n');
if(buf[qq] != byte '\n')
return (nil, -1);
(d, pp) := debugid(ss, buf, qq + 1);
if(pp == -1)
return (nil, -1);
t := ref Type(src, Tadt, int string buf[sq:qq], string buf[p:q], nil, d, nil);
return (t, pp);
}
#
# parse a list of tags
# format:
# name ':' src size '\n' ids
# or
# name ':' src '\n'
#
debugtag(ss: ref SrcState, buf: array of byte, p: int): (array of ref Type, int)
{
d: array of ref Id;
ntg, q, pp, np: int;
src: ref Src;
(ntg, p) = strtoi(buf, p);
if(buf[p++] != byte '\n')
return (nil, -1);
tg := array[ntg] of ref Type;
for(i := 0; i < ntg; i++){
pp = strchr(buf, p, ':');
if(buf[pp] != byte ':')
return (nil, -1);
q = pp + 1;
(src, q) = debugsrc(ss, buf, q);
if(q < 0)
return (nil, -1);
if(buf[q] == byte '\n'){
np = q + 1;
if(i <= 0)
return (nil, -1);
tg[i] = ref Type(src, Tadt, tg[i-1].size, string buf[p:pp], nil, tg[i-1].ids, nil);
}else{
np = strchr(buf, q, '\n');
if(buf[np] != byte '\n')
return (nil, -1);
size := int string buf[q:np];
(d, np) = debugid(ss, buf, np+1);
if(np == -1)
return (nil, -1);
tg[i] = ref Type(src, Tadt, size, string buf[p:pp], nil, d, nil);
}
p = np;
}
return (tg, p);
}
strchr(a: array of byte, p, c: int): int
{
bc := byte c;
while((b := a[p]) != byte 0 && b != bc)
p++;
return p;
}
strtoi(a: array of byte, start: int): (int, int)
{
p := start;
for(; c := int a[p]; p++){
case c{
' ' or '\t' or '\n' or '\r' =>
continue;
}
break;
}
# sign
neg := c == '-';
if(neg || c == '+')
p++;
# digits
n := 0;
nn := 0;
ndig := 0;
over := 0;
for(; c = int a[p]; p++){
if(c < '0' || c > '9')
break;
ndig++;
nn = n * 10 + (c - '0');
if(nn < n)
over = 1;
n = nn;
}
if(ndig == 0)
return (0, start);
if(neg)
n = -n;
if(over)
if(neg)
n = 2147483647;
else
n = int -2147483648;
return (n, p);
}
hex(a: array of byte): int
{
n := 0;
for(i := 0; i < len a; i++){
c := int a[i];
if(c >= '0' && c <= '9')
c -= '0';
else
c -= 'a' - 10;
n = (n << 4) + (c & 15);
}
return n;
}
partition(n : int, max : int) : (int, int, int)
{
p := n/max;
if (n%max != 0)
p++;
if (p > max)
p = max;
q := n/p;
r := n-p*q;
return (p, q, r);
}
bounds(s : string) : (int, int)
{
lb := int s;
for (i := 0; i < len s; i++)
if (s[i] == '.')
break;
if (i+1 >= len s || s[i] != '.' || s[i+1] != '.')
return (1, 0);
ub := int s[i+2:];
return (lb, ub);
}