ref: 54bac038f411c10a596adf84c06df32f8c7c4c53
dir: /appl/cmd/stackv.b/
implement Stackv;
include "sys.m";
sys: Sys;
include "draw.m";
include "debug.m";
debug: Debug;
Prog, Module, Exp: import debug;
Tadt, Tarray, Tbig, Tbyte, Treal,
Tfn, Tint, Tlist,
Tref, Tstring, Tslice: import Debug;
include "arg.m";
include "bufio.m";
bufio: Bufio;
Iobuf: import bufio;
stderr: ref Sys->FD;
stdout: ref Iobuf;
hasht := array[97] of (int, array of int);
Stackv: module {
init: fn(ctxt: ref Draw->Context, argv: list of string);
};
maxrecur := 16r7ffffffe;
badmodule(p: string)
{
sys->fprint(stderr, "stackv: cannot load %q: %r\n", p);
raise "fail:bad module";
}
currp: ref Prog;
showtypes := 1;
showsource := 0;
showmodule := 0;
init(nil: ref Draw->Context, argv: list of string)
{
sys = load Sys Sys->PATH;
stderr = sys->fildes(2);
debug = load Debug Debug->PATH;
if(debug == nil)
badmodule(Debug->PATH);
bufio = load Bufio Bufio->PATH;
if (bufio == nil)
badmodule(Bufio->PATH);
arg := load Arg Arg->PATH;
if (arg == nil)
badmodule(Arg->PATH);
stdout = bufio->fopen(sys->fildes(1), Sys->OWRITE);
arg->init(argv);
arg->setusage("stackv [-Tlm] [-r maxdepth] [-s dis sbl]... [pid[.sym]...] ...");
sblfile := "";
while((opt := arg->opt()) != 0){
case opt {
's' =>
arg->earg(); # XXX make it a list of maps from dis to sbl later
sblfile = arg->earg();
'l' =>
showsource = 1;
'm' =>
showmodule = 1;
'r' =>
maxrecur = int arg->earg();
'T' =>
showtypes = 0;
* =>
arg->usage();
}
}
debug->init();
argv = arg->argv();
printpids := len argv > 1;
if(printpids)
maxrecur++;
for(; argv != nil; argv = tl argv)
db(sys->tokenize(hd argv, ".").t1, printpids);
}
db(toks: list of string, printpid: int): int
{
if(toks == nil){
sys->fprint(stderr, "stackv: bad pid\n");
return -1;
}
if((pid := int hd toks) <= 0){
sys->fprint(stderr, "stackv: bad pid %q\n", hd toks);
return -1;
}
err: string;
p: ref Prog;
# reuse process if possible
if(currp == nil || currp.id != pid){
(currp, err) = debug->prog(pid);
if(err != nil){
sys->fprint(stderr, "stackv: %s\n", err);
return -1;
}
if(currp == nil){
sys->fprint(stderr, "stackv: nil prog from pid %d\n", pid);
return -1;
}
}
p = currp;
stk: array of ref Exp;
(stk, err) = p.stack();
if(err != nil){
sys->fprint(stderr, "stackv: %s\n", err);
return -1;
}
for (i := 0; i < len stk; i++) {
stk[i].m.stdsym();
stk[i].findsym();
}
depth := 0;
if(printpid){
stdout.puts(sys->sprint("prog %d {\n", pid)); # }
depth++;
}
pexp(stk, tl toks, depth);
if(printpid)
stdout.puts("}\n");
stdout.flush();
return 0;
}
pexp(stk: array of ref Exp, toks: list of string, depth: int)
{
if(toks == nil){
for (i := 0; i < len stk; i++)
pfn(stk[i], depth);
}else{
exp := stackfindsym(stk, toks, depth);
if(exp == nil)
return;
pname(exp, depth, nil);
stdout.putc('\n');
}
}
stackfindsym(stk: array of ref Exp, toks: list of string, depth: int): ref Exp
{
fname := hd toks;
toks = tl toks;
for(i := 0; i < len stk; i++){
s := stk[i].name;
if(s == fname)
break;
if(hasdot(s) && toks != nil && s == fname+"."+hd toks){
fname += "."+hd toks;
toks = tl toks;
break;
}
}
if(i == len stk){
indent(depth);
stdout.puts("function not found\n");
return nil;
}
if(toks == nil)
return stk[i];
stk = stk[i].expand();
if(hd toks == "module"){
if((e := getname(stk, "module")) == nil){
indent(depth);
stdout.puts(sys->sprint("no module declarations in function %q\n", fname));
}else if((e = symfindsym(e, tl toks, depth)) != nil)
return e;
return nil;
}
for(t := "locals" :: "args" :: "module" :: nil; t != nil; t = tl t){
if((e := getname(stk, hd t)) == nil)
continue;
if((e = symfindsym(e, toks, depth)) != nil)
return e;
}
indent(depth);
stdout.puts(sys->sprint("symbol %q not found in function %q\n", hd toks, fname));
return nil;
}
hasdot(s: string): int
{
for(i := 0; i < len s; i++)
if(s[i] == '.')
return 1;
return 0;
}
symfindsym(e: ref Exp, toks: list of string, depth: int): ref Exp
{
if(toks == nil)
return e;
exps := e.expand();
for(i := 0; i < len exps; i++)
if(exps[i].name == hd toks)
return symfindsym(exps[i], tl toks, depth);
return nil;
}
pfn(exp: ref Exp, depth: int)
{
(v, w) := exp.val();
if(!w || v == nil){
indent(depth);
stdout.puts(sys->sprint("no value for fn %q\n", exp.name));
return;
}
exps := exp.expand();
indent(depth);
stdout.puts("["+exp.srcstr()+"]\n");
indent(depth);
stdout.puts(symname(exp)+"(");
if((e := getname(exps, "args")) != nil){
args := e.expand();
for(i := 0; i < len args; i++){
pname(args[i], depth+1, nil);
if(i != len args - 1)
stdout.puts(", ");
}
}
stdout.puts(")\n");
indent(depth);
stdout.puts("{\n"); # }
if((e = getname(exps, "locals")) != nil){
locals := e.expand();
for(i := 0; i < len locals; i++){
indent(depth+1);
pname(locals[i], depth+1, nil);
stdout.puts("\n");
}
}
if(showmodule && (e = getname(exps, "module")) != nil){
mvars := e.expand();
for(i := 0; i < len mvars; i++){
indent(depth+1);
pname(mvars[i], depth+1, "module.");
stdout.puts("\n");
}
}
indent(depth);
stdout.puts("}\n");
}
getname(exps: array of ref Exp, name: string): ref Exp
{
for(i := 0; i < len exps; i++)
if(exps[i].name == name)
return exps[i];
return nil;
}
strval(v: string): string
{
for(i := 0; i < len v; i++)
if(v[i] == '"')
break;
if(i < len v)
v = v[i:];
return v;
}
pname(exp: ref Exp, depth: int, prefix: string)
{
name := prefix+symname(exp);
(v, w) := exp.val();
if (!w && v == nil) {
stdout.puts(sys->sprint("%s: %s = novalue", symname(exp), exp.typename()));
return;
}
case exp.kind() {
Tfn =>
pfn(exp, depth);
Tint =>
stdout.puts(sys->sprint("%s := %s", name, v));
Tstring =>
stdout.puts(sys->sprint("%s := %s", name, strval(v)));
Tbyte or
Tbig or
Treal =>
stdout.puts(sys->sprint("%s := %s %s", name, exp.typename(), v));
* =>
if(showtypes)
stdout.puts(sys->sprint("%s: %s = ", name, exp.typename()));
else
stdout.puts(sys->sprint("%s := ", name));
pval(exp, v, w, depth);
}
}
srcstr(src: ref Debug->Src): string
{
if(src == nil)
return nil;
if(src.start.file != src.stop.file)
return sys->sprint("%q:%d.%d,%q:%d.%d", src.start.file, src.start.line, src.start.pos, src.stop.file, src.stop.line, src.stop.pos);
if(src.start.line != src.stop.line)
return sys->sprint("%q:%d.%d,%d.%d", src.start.file, src.start.line, src.start.pos, src.stop.line, src.stop.pos);
return sys->sprint("%q:%d.%d,%d", src.start.file, src.start.line, src.start.pos, src.stop.pos);
}
pval(exp: ref Exp, v: string, w: int, depth: int)
{
if(depth >= maxrecur){
stdout.puts(v);
return;
}
case exp.kind() {
Tarray =>
if(pref(v)){
if(depth+1 >= maxrecur)
stdout.puts(v+"{...}");
else{
stdout.puts(v+"{\n");
indent(depth+1);
parray(exp, depth+1);
stdout.puts("\n");
indent(depth);
stdout.puts("}");
}
}
Tlist =>
if(v == "nil")
stdout.puts("nil");
else
if(depth+1 >= maxrecur)
stdout.puts(v+"{...}");
else{
stdout.puts("{\n");
indent(depth+1);
plist(exp, v, w, depth+1);
stdout.puts("\n");
indent(depth);
stdout.puts("}");
}
Tadt =>
pgenval(exp, nil, w, depth);
Tref =>
if(pref(v))
pgenval(exp, v, w, depth);
Tstring =>
stdout.puts(strval(v));
* =>
pgenval(exp, v, w, depth);
}
}
parray(exp: ref Exp, depth: int)
{
exps := exp.expand();
for(i := 0; i < len exps; i++){
e := exps[i];
(v, w) := e.val();
if(e.kind() == Tslice)
parray(e, depth);
else{
pval(e, v, w, depth);
stdout.puts(", ");
}
}
}
plist(exp: ref Exp, v: string, w: int, depth: int)
{
while(w && v != "nil"){
exps := exp.expand();
h := getname(exps, "hd");
if(h == nil)
break;
(hv, vw) := h.val();
if(pref(v) == 0)
return;
stdout.puts(v+"(");
pval(h, hv, vw, depth);
stdout.puts(") :: ");
h = nil;
exp = getname(exps, "tl");
(v, w) = exp.val();
}
stdout.puts("nil");
}
pgenval(exp: ref Exp, v: string, w: int, depth: int)
{
if(w){
exps := exp.expand();
if(len exps == 0)
stdout.puts(v);
else{
stdout.puts(v+"{\n"); # }
if (len exps > 0){
if(depth >= maxrecur){
indent(depth);
stdout.puts(sys->sprint("...[%d]\n", len exps));
}else{
for (i := 0; i < len exps; i++){
indent(depth+1);
pname(exps[i], depth+1, nil);
stdout.puts("\n");
}
}
}
indent(depth); # {
stdout.puts("}");
}
}else
stdout.puts(v);
}
symname(exp: ref Exp): string
{
if(showsource == 0)
return exp.name;
return exp.name+"["+srcstr(exp.src())+"]";
}
indent(n: int)
{
while(n-- > 0)
stdout.putc('\t');
}
ref2int(v: string): int
{
if(v == nil)
error("bad empty value for ref");
i := 0;
n := len v;
if(v[0] == '@')
i = 1;
else{
# skip array bounds
if(v[0] == '['){
for(; i < n && v[i] != ']'; i++)
;
if(i >= n - 2 || v[i+1] != ' ' || v[i+2] != '@')
error("bad value for ref: "+v);
i += 3;
}
}
if(n - i > 8)
error("64-bit pointers?");
p := 0;
for(; i < n; i++){
c := v[i];
case c {
'0' to '9' =>
p = (p << 4) + (c - '0');
'a' to 'f' =>
p = (p << 4) + (c - 'a' + 10);
* =>
error("bad value for ref: "+v);
}
}
return p;
}
pref(v: string): int
{
if(v == "nil"){
stdout.puts("nil");
return 0;
}
if(addref(ref2int(v)) == 0){
stdout.puts(v);
stdout.puts("(qv)");
return 0;
}
return 1;
}
# hash table implementation that tries to be reasonably
# parsimonious on memory usage.
addref(v: int): int
{
slot := (v & 16r7fffffff) % len hasht;
(n, a) := hasht[slot];
for(i := 0; i < n; i++)
if(a[i] == v)
return 0;
if(n == len a){
if(n == 0)
n = 3;
t := array[n*3/2] of int;
t[0:] = a;
hasht[slot].t1 = t;
a = t;
}
a[hasht[slot].t0++] = v;
return 1;
}
error(e: string)
{
sys->fprint(sys->fildes(2), "stackv: error: %s\n", e);
raise "fail:error";
}