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gc: descriptive panic for nil pointer -> value method call

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R=ken2
CC=golang-dev
https://golang.org/cl/4646042
This commit is contained in:
Russ Cox 2011-06-17 15:23:27 -04:00
parent f4c7db0ed9
commit e852202f37
7 changed files with 38 additions and 5 deletions
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1
src/cmd/5g/reg.c
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@ -1525,6 +1525,7 @@ noreturn(Prog *p)
symlist[1] = pkglookup("panicslice", runtimepkg);
symlist[2] = pkglookup("throwinit", runtimepkg);
symlist[3] = pkglookup("panic", runtimepkg);
symlist[4] = pkglookup("panicwrap", runtimepkg);
}
s = p->to.sym;

1
src/cmd/6g/reg.c
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@ -1677,6 +1677,7 @@ noreturn(Prog *p)
symlist[1] = pkglookup("panicslice", runtimepkg);
symlist[2] = pkglookup("throwinit", runtimepkg);
symlist[3] = pkglookup("panic", runtimepkg);
symlist[4] = pkglookup("panicwrap", runtimepkg);
}
s = p->to.sym;

1
src/cmd/8g/reg.c
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@ -1533,6 +1533,7 @@ noreturn(Prog *p)
symlist[1] = pkglookup("panicslice", runtimepkg);
symlist[2] = pkglookup("throwinit", runtimepkg);
symlist[3] = pkglookup("panic", runtimepkg);
symlist[4] = pkglookup("panicwrap", runtimepkg);
}
s = p->to.sym;

4
src/cmd/gc/builtin.c.boot
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@ -6,6 +6,7 @@ char *runtimeimport =
"func \"\".panicslice ()\n"
"func \"\".throwreturn ()\n"
"func \"\".throwinit ()\n"
"func \"\".panicwrap (? string, ? string, ? string)\n"
"func \"\".panic (? interface { })\n"
"func \"\".recover (? *int32) interface { }\n"
"func \"\".printbool (? bool)\n"
@ -22,6 +23,7 @@ char *runtimeimport =
"func \"\".printsp ()\n"
"func \"\".goprintf ()\n"
"func \"\".concatstring ()\n"
"func \"\".append ()\n"
"func \"\".appendslice (typ *uint8, x any, y []any) any\n"
"func \"\".cmpstring (? string, ? string) int\n"
"func \"\".slicestring (? string, ? int, ? int) string\n"
@ -81,7 +83,7 @@ char *runtimeimport =
"func \"\".selectgo (sel *uint8)\n"
"func \"\".block ()\n"
"func \"\".makeslice (typ *uint8, nel int64, cap int64) []any\n"
"func \"\".growslice (typ *uint8, old []any, cap int64) []any\n"
"func \"\".growslice (typ *uint8, old []any, n int64) []any\n"
"func \"\".sliceslice1 (old []any, lb uint64, width uint64) []any\n"
"func \"\".sliceslice (old []any, lb uint64, hb uint64, width uint64) []any\n"
"func \"\".slicearray (old *any, nel uint64, lb uint64, hb uint64, width uint64) []any\n"

1
src/cmd/gc/runtime.go
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@ -15,6 +15,7 @@ func panicindex()
func panicslice()
func throwreturn()
func throwinit()
func panicwrap(string, string, string)
func panic(interface{})
func recover(*int32) interface{}

30
src/cmd/gc/subr.c
View File

@ -3131,8 +3131,9 @@ genwrapper(Type *rcvr, Type *method, Sym *newnam, int iface)
NodeList *l, *args, *in, *out;
Type *tpad;
int isddd;
Val v;
if(0 && debug['r'])
if(debug['r'])
print("genwrapper rcvrtype=%T method=%T newnam=%S\n",
rcvr, method, newnam);
@ -3174,17 +3175,38 @@ genwrapper(Type *rcvr, Type *method, Sym *newnam, int iface)
args = list(args, l->n->left);
isddd = l->n->left->isddd;
}
// generate nil pointer check for better error
if(isptr[rcvr->etype] && rcvr->type == getthisx(method->type)->type->type) {
// generating wrapper from *T to T.
n = nod(OIF, N, N);
n->ntest = nod(OEQ, this->left, nodnil());
// these strings are already in the reflect tables,
// so no space cost to use them here.
l = nil;
v.ctype = CTSTR;
v.u.sval = strlit(rcvr->type->sym->pkg->name); // package name
l = list(l, nodlit(v));
v.u.sval = strlit(rcvr->type->sym->name); // type name
l = list(l, nodlit(v));
v.u.sval = strlit(method->sym->name);
l = list(l, nodlit(v)); // method name
call = nod(OCALL, syslook("panicwrap", 0), N);
call->list = l;
n->nbody = list1(call);
fn->nbody = list(fn->nbody, n);
}
// generate call
call = nod(OCALL, adddot(nod(OXDOT, this->left, newname(method->sym))), N);
call->list = args;
call->isddd = isddd;
fn->nbody = list1(call);
if(method->type->outtuple > 0) {
n = nod(ORETURN, N, N);
n->list = fn->nbody;
fn->nbody = list1(n);
n->list = list1(call);
call = n;
}
fn->nbody = list(fn->nbody, call);
if(0 && debug['r'])
dumplist("genwrapper body", fn->nbody);

5
src/pkg/runtime/error.go
View File

@ -131,3 +131,8 @@ func printany(i interface{}) {
print("(", typestring(i), ") ", i)
}
}
// called from generated code
func panicwrap(pkg, typ, meth string) {
panic("value method " + pkg + "." + typ + "." + meth + " called using nil *" + typ + " pointer")
}