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gc: more cleanup

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* disallow surrogate pair runes.
 * diagnose impossible type assertions
 * eliminate another static buffer.
 * do not overflow lexbuf.
 * add -u flag to disable package unsafe.

R=ken2
CC=golang-dev
https://golang.org/cl/1619042
This commit is contained in:
Russ Cox 2010-06-09 11:00:55 -07:00
parent 42a691b877
commit a2a7d473f4
6 changed files with 120 additions and 40 deletions
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1
src/cmd/gc/go.h
View File

@ -659,6 +659,7 @@ EXTERN char* outfile;
EXTERN Biobuf* bout;
EXTERN int nerrors;
EXTERN int nsyntaxerrors;
EXTERN int safemode;
EXTERN char namebuf[NSYMB];
EXTERN char lexbuf[NSYMB];
EXTERN char debug[256];

90
src/cmd/gc/lex.c
View File

@ -21,6 +21,26 @@ enum
EOF = -1,
};
void
usage(void)
{
print("usage: %cg [flags] file.go...\n");
print("flags:\n");
// -A is allow use of "any" type, for bootstrapping
print(" -I DIR search for packages in DIR\n");
print(" -d print declarations\n");
print(" -e no limit on number of errors printed\n");
print(" -f print stack frame structure\n");
print(" -h panic on an error\n");
print(" -o file specify output file\n");
print(" -S print the assembly language\n");
print(" -V print the compiler version\n");
print(" -u disable package unsafe\n");
print(" -w print the parse tree after typing\n");
print(" -x print lex tokens\n");
exit(0);
}
int
main(int argc, char *argv[])
{
@ -62,19 +82,24 @@ main(int argc, char *argv[])
break;
case 'o':
outfile = ARGF();
outfile = EARGF(usage());
break;
case 'I':
addidir(ARGF());
addidir(EARGF(usage()));
break;
case 'u':
safemode = 1;
break;
case 'V':
print("%cg version %s\n", thechar, getgoversion());
errorexit();
exit(0);
} ARGEND
if(argc < 1)
goto usage;
usage();
// special flag to detect compilation of package runtime
compiling_runtime = debug['+'];
@ -188,22 +213,6 @@ main(int argc, char *argv[])
flusherrors();
exit(0);
return 0;
usage:
print("flags:\n");
// -A is allow use of "any" type, for bootstrapping
print(" -I DIR search for packages in DIR\n");
print(" -d print declarations\n");
print(" -e no limit on number of errors printed\n");
print(" -f print stack frame structure\n");
print(" -h panic on an error\n");
print(" -o file specify output file\n");
print(" -S print the assembly language\n");
print(" -V print the compiler version\n");
print(" -w print the parse tree after typing\n");
print(" -x print lex tokens\n");
exit(0);
return 0;
}
int
@ -336,6 +345,10 @@ importfile(Val *f, int line)
}
if(strcmp(f->u.sval->s, "unsafe") == 0) {
if(safemode) {
yyerror("cannot import package unsafe");
errorexit();
}
importpkg = mkpkg(f->u.sval);
cannedimports("unsafe.6", unsafeimport);
return;
@ -461,7 +474,7 @@ _yylex(void)
{
int c, c1, clen, escflag, ncp;
vlong v;
char *cp;
char *cp, *ep;
Rune rune;
Sym *s;
static Loophack *lstk;
@ -485,11 +498,13 @@ l0:
if(c >= Runeself) {
/* all multibyte runes are alpha */
cp = lexbuf;
ep = lexbuf+sizeof lexbuf;
goto talph;
}
if(isalpha(c)) {
cp = lexbuf;
ep = lexbuf+sizeof lexbuf;
goto talph;
}
@ -504,12 +519,14 @@ l0:
case '_':
cp = lexbuf;
ep = lexbuf+sizeof lexbuf;
goto talph;
case '.':
c1 = getc();
if(isdigit(c1)) {
cp = lexbuf;
ep = lexbuf+sizeof lexbuf;
*cp++ = c;
c = c1;
c1 = 0;
@ -862,6 +879,10 @@ talph:
* prefix has been stored
*/
for(;;) {
if(cp+10 >= ep) {
yyerror("identifier too long");
errorexit();
}
if(c >= Runeself) {
ungetc(c);
rune = getr();
@ -898,8 +919,13 @@ talph:
tnum:
c1 = 0;
cp = lexbuf;
ep = lexbuf+sizeof lexbuf;
if(c != '0') {
for(;;) {
if(cp+10 >= ep) {
yyerror("identifier too long");
errorexit();
}
*cp++ = c;
c = getc();
if(isdigit(c))
@ -911,6 +937,10 @@ tnum:
c = getc();
if(c == 'x' || c == 'X') {
for(;;) {
if(cp+10 >= ep) {
yyerror("identifier too long");
errorexit();
}
*cp++ = c;
c = getc();
if(isdigit(c))
@ -930,6 +960,10 @@ tnum:
c1 = 0;
for(;;) {
if(cp+10 >= ep) {
yyerror("identifier too long");
errorexit();
}
if(!isdigit(c))
break;
if(c < '0' || c > '7')
@ -973,6 +1007,10 @@ ncu:
casedot:
for(;;) {
if(cp+10 >= ep) {
yyerror("identifier too long");
errorexit();
}
*cp++ = c;
c = getc();
if(!isdigit(c))
@ -993,6 +1031,10 @@ casee:
if(!isdigit(c))
yyerror("malformed fp constant exponent");
while(isdigit(c)) {
if(cp+10 >= ep) {
yyerror("identifier too long");
errorexit();
}
*cp++ = c;
c = getc();
}
@ -1010,6 +1052,10 @@ casep:
if(!isdigit(c))
yyerror("malformed fp constant exponent");
while(isdigit(c)) {
if(cp+10 >= ep) {
yyerror("identifier too long");
errorexit();
}
*cp++ = c;
c = getc();
}
@ -1254,7 +1300,7 @@ hex:
ungetc(c);
break;
}
if(u && l > Runemax) {
if(u && (l > Runemax || (0xd800 <= l && l < 0xe000))) {
yyerror("invalid Unicode code point in escape sequence: %#llx", l);
l = Runeerror;
}

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

@ -877,7 +877,6 @@ Oconv(Fmt *fp)
int
Lconv(Fmt *fp)
{
char str[STRINGSZ], s[STRINGSZ];
struct
{
Hist* incl; /* start of this include file */
@ -917,29 +916,25 @@ Lconv(Fmt *fp)
if(n > HISTSZ)
n = HISTSZ;
str[0] = 0;
for(i=n-1; i>=0; i--) {
if(i != n-1) {
if(fp->flags & ~(FmtWidth|FmtPrec))
break;
strcat(str, " ");
fmtprint(fp, " ");
}
if(a[i].line)
snprint(s, STRINGSZ, "%s:%ld[%s:%ld]",
fmtprint(fp, "%s:%ld[%s:%ld]",
a[i].line->name, lno-a[i].ldel+1,
a[i].incl->name, lno-a[i].idel+1);
else
snprint(s, STRINGSZ, "%s:%ld",
fmtprint(fp, "%s:%ld",
a[i].incl->name, lno-a[i].idel+1);
if(strlen(s)+strlen(str) >= STRINGSZ-10)
break;
strcat(str, s);
lno = a[i].incl->line - 1; /* now print out start of this file */
}
if(n == 0)
strcat(str, "<epoch>");
fmtprint(fp, "<epoch>");
return fmtstrcpy(fp, str);
return 0;
}
/*
@ -1135,10 +1130,10 @@ Tpretty(Fmt *fp, Type *t)
Type *t1;
Sym *s;
if(debug['U']) {
debug['U'] = 0;
if(debug['r']) {
debug['r'] = 0;
fmtprint(fp, "%T (orig=%T)", t, t->orig);
debug['U'] = 1;
debug['r'] = 1;
return 0;
}
@ -1871,6 +1866,11 @@ assignop(Type *src, Type *dst, char **why)
if(why != nil)
*why = "";
if(safemode && (isptrto(src, TANY) || isptrto(dst, TANY))) {
yyerror("cannot use unsafe.Pointer");
errorexit();
}
if(src == dst)
return OCONVNOP;
if(src == T || dst == T || src->etype == TFORW || dst->etype == TFORW || src->orig == T || dst->orig == T)
@ -1894,7 +1894,8 @@ assignop(Type *src, Type *dst, char **why)
*why = smprint(": %T is pointer to interface, not interface", src);
else if(have)
*why = smprint(": %T does not implement %T (wrong type for %S method)\n"
"\thave %T\n\twant %T", src, dst, missing->sym, have->type, missing->type);
"\thave %S%hhT\n\twant %S%hhT", src, dst, missing->sym,
have->sym, have->type, missing->sym, missing->type);
else
*why = smprint(": %T does not implement %T (missing %S method)",
src, dst, missing->sym);
@ -2031,7 +2032,6 @@ convertop(Type *src, Type *dst, char **why)
// 9. src is unsafe.Pointer and dst is a pointer or uintptr.
if(isptrto(src, TANY) && (isptr[dst->etype] || dst->etype == TUINTPTR))
return OCONVNOP;
return 0;
}

16
src/cmd/gc/typecheck.c
View File

@ -52,7 +52,7 @@ typecheck(Node **np, int top)
Node *n, *l, *r;
NodeList *args;
int lno, ok, ntop;
Type *t;
Type *t, *missing, *have;
Sym *sym;
Val v;
char *why;
@ -521,6 +521,18 @@ reswitch:
if(n->type == T)
goto error;
}
if(n->type != T && n->type->etype != TINTER)
if(!implements(n->type, t, &missing, &have)) {
if(have)
yyerror("impossible type assertion: %+N cannot have dynamic type %T"
" (wrong type for %S method)\n\thave %S%hhT\n\twant %S%hhT",
l, n->type, missing->sym, have->sym, have->type,
missing->sym, missing->type);
else
yyerror("impossible type assertion: %+N cannot have dynamic type %T"
" (missing %S method)", l, n->type, missing->sym);
goto error;
}
goto ret;
case OINDEX:
@ -1179,6 +1191,8 @@ ret:
checkwidth(t);
}
}
if(safemode && isptrto(t, TANY))
yyerror("cannot use unsafe.Pointer");
evconst(n);
if(n->op == OTYPE && !(top & Etype)) {

2
src/cmd/gc/unsafe.c
View File

@ -19,7 +19,7 @@ unsafenmagic(Node *fn, NodeList *args)
long v;
Val val;
if(fn == N || fn->op != ONAME || (s = fn->sym) == S)
if(safemode || fn == N || fn->op != ONAME || (s = fn->sym) == S)
goto no;
if(s->pkg != unsafepkg)
goto no;

21
test/interface/explicit.go
View File

@ -1,4 +1,4 @@
// errchk $G $D/$F.go
// errchk $G -e $D/$F.go
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
@ -50,3 +50,22 @@ func main() {
e = E(t) // ok
t = T(e) // ERROR "need explicit|need type assertion|incompatible"
}
type M interface { M() }
var m M
var _ = m.(int) // ERROR "impossible type assertion"
type Int int
func (Int) M(float) {}
var _ = m.(Int) // ERROR "impossible type assertion"
var ii int
var jj Int
var m1 M = ii // ERROR "missing"
var m2 M = jj // ERROR "wrong type for M method"
var m3 = M(ii) // ERROR "missing"
var m4 = M(jj) // ERROR "wrong type for M method"