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https://github.com/golang/go
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gc: fix smaller-than-pointer-sized receivers in interfaces
Fixes #812. R=ken2 CC=golang-dev https://golang.org/cl/1904041
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@ -705,7 +705,7 @@ out:
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p->to.type = D_OREG;
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p->to.reg = NREG;
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p->to.name = D_EXTERN;
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p->to.sym = methodsym(method->sym, ptrto(f->type));
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p->to.sym = methodsym(method->sym, ptrto(f->type), 0);
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//print("4. %P\n", p);
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pc->as = ARET; // overwrite AEND
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@ -732,7 +732,7 @@ out:
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p = pc;
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gins(AJMP, N, N);
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p->to.type = D_EXTERN;
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p->to.sym = methodsym(method->sym, ptrto(f->type));
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p->to.sym = methodsym(method->sym, ptrto(f->type), 0);
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//print("6. %P\n", p);
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pc->as = ARET; // overwrite AEND
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@ -739,7 +739,7 @@ out:
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p = pc;
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gins(AJMP, N, N);
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p->to.type = D_EXTERN;
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p->to.sym = methodsym(method->sym, ptrto(f->type));
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p->to.sym = methodsym(method->sym, ptrto(f->type), 0);
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//print("6. %P\n", p);
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pc->as = ARET; // overwrite AEND
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@ -1017,11 +1017,12 @@ functype(Node *this, NodeList *in, NodeList *out)
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}
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Sym*
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methodsym(Sym *nsym, Type *t0)
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methodsym(Sym *nsym, Type *t0, int iface)
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{
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Sym *s;
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char *p;
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Type *t;
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char *suffix;
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t = t0;
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if(t == T)
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@ -1043,7 +1044,13 @@ methodsym(Sym *nsym, Type *t0)
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if(t != t0 && t0->sym)
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t0 = ptrto(t);
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p = smprint("%#hT·%s", t0, nsym->name);
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suffix = "";
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if(iface) {
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dowidth(t0);
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if(t0->width < types[tptr]->width)
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suffix = "·i";
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}
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p = smprint("%#hT·%s%s", t0, nsym->name, suffix);
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s = pkglookup(p, s->pkg);
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free(p);
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return s;
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@ -1058,7 +1065,7 @@ methodname(Node *n, Type *t)
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{
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Sym *s;
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s = methodsym(n->sym, t);
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s = methodsym(n->sym, t, 0);
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if(s == S)
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return n;
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return newname(s);
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@ -858,7 +858,7 @@ int isifacemethod(Type *f);
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void markdcl(void);
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Node* methodname(Node *n, Type *t);
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Node* methodname1(Node *n, Node *t);
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Sym* methodsym(Sym *nsym, Type *t0);
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Sym* methodsym(Sym *nsym, Type *t0, int iface);
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Node* newname(Sym *s);
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Type* newtype(Sym *s);
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Node* oldname(Sym *s);
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@ -1061,7 +1061,7 @@ void flusherrors(void);
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void frame(int context);
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Type* funcfirst(Iter *s, Type *t);
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Type* funcnext(Iter *s);
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void genwrapper(Type *rcvr, Type *method, Sym *newnam);
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void genwrapper(Type *rcvr, Type *method, Sym *newnam, int iface);
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Type** getinarg(Type *t);
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Type* getinargx(Type *t);
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Type** getoutarg(Type *t);
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@ -183,14 +183,14 @@ methods(Type *t)
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a = b;
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a->name = method->name;
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a->isym = methodsym(method, it);
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a->tsym = methodsym(method, t);
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a->isym = methodsym(method, it, 1);
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a->tsym = methodsym(method, t, 0);
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a->type = methodfunc(f->type, 1);
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a->mtype = methodfunc(f->type, 0);
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if(!(a->isym->flags & SymSiggen)) {
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a->isym->flags |= SymSiggen;
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if(!eqtype(this, it)) {
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if(!eqtype(this, it) || this->width < types[tptr]->width) {
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if(oldlist == nil)
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oldlist = pc;
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// Is okay to call genwrapper here always,
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@ -201,7 +201,7 @@ methods(Type *t)
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&& f->embedded && !isifacemethod(f->type))
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genembedtramp(it, f, a->isym);
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else
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genwrapper(it, f, a->isym);
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genwrapper(it, f, a->isym, 1);
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}
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}
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@ -214,7 +214,7 @@ methods(Type *t)
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&& f->embedded && !isifacemethod(f->type))
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genembedtramp(t, f, a->tsym);
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else
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genwrapper(t, f, a->tsym);
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genwrapper(t, f, a->tsym, 0);
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}
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}
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}
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@ -3043,10 +3043,11 @@ structargs(Type **tl, int mustname)
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* newnam - the eventual mangled name of this function
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*/
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void
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genwrapper(Type *rcvr, Type *method, Sym *newnam)
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genwrapper(Type *rcvr, Type *method, Sym *newnam, int iface)
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{
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Node *this, *fn, *call, *n, *t;
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Node *this, *fn, *call, *n, *t, *pad;
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NodeList *l, *args, *in, *out;
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Type *tpad;
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if(debug['r'])
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print("genwrapper rcvrtype=%T method=%T newnam=%S\n",
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@ -3062,8 +3063,21 @@ genwrapper(Type *rcvr, Type *method, Sym *newnam)
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fn = nod(ODCLFUNC, N, N);
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fn->nname = newname(newnam);
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t = nod(OTFUNC, this, N);
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t->list = in;
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t = nod(OTFUNC, N, N);
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l = list1(this);
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if(iface && rcvr->width < types[tptr]->width) {
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// Building method for interface table and receiver
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// is smaller than the single pointer-sized word
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// that the interface call will pass in.
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// Add a dummy padding argument after the
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// receiver to make up the difference.
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tpad = typ(TARRAY);
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tpad->type = types[TUINT8];
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tpad->bound = types[tptr]->width - rcvr->width;
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pad = nod(ODCLFIELD, newname(lookup(".pad")), typenod(tpad));
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l = list(l, pad);
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}
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t->list = concat(l, in);
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t->rlist = out;
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fn->nname->ntype = t;
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funchdr(fn);
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@ -494,7 +494,7 @@ reswitch:
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goto error;
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}
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n->op = ONAME;
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n->sym = methodsym(sym, l->type);
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n->sym = methodsym(sym, l->type, 0);
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n->type = methodfunc(n->type, 1);
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n->xoffset = 0;
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getinargx(n->type)->type->type = l->type; // fix up receiver
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82
test/fixedbugs/bug296.go
Normal file
82
test/fixedbugs/bug296.go
Normal file
@ -0,0 +1,82 @@
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package main
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type I interface {
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m(a, b, c, d, e, f, g, h byte)
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}
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type Int8 int8
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func (x Int8) m(a, b, c, d, e, f, g, h byte) {
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check("Int8", int64(x), 0x01, a, b, c, d, e, f, g, h)
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}
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type Uint8 uint8
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func (x Uint8) m(a, b, c, d, e, f, g, h byte) {
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check("Uint8", int64(x), 0x01, a, b, c, d, e, f, g, h)
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}
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type Int16 int16
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func (x Int16) m(a, b, c, d, e, f, g, h byte) {
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check("Int16", int64(x), 0x0102, a, b, c, d, e, f, g, h)
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}
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type Uint16 uint16
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func (x Uint16) m(a, b, c, d, e, f, g, h byte) {
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check("Uint16", int64(x), 0x0102, a, b, c, d, e, f, g, h)
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}
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type Int32 int32
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func (x Int32) m(a, b, c, d, e, f, g, h byte) {
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check("Int32", int64(x), 0x01020304, a, b, c, d, e, f, g, h)
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}
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type Uint32 uint32
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func (x Uint32) m(a, b, c, d, e, f, g, h byte) {
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check("Uint32", int64(x), 0x01020304, a, b, c, d, e, f, g, h)
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}
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type Int64 int64
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func (x Int64) m(a, b, c, d, e, f, g, h byte) {
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check("Int64", int64(x), 0x0102030405060708, a, b, c, d, e, f, g, h)
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}
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type Uint64 uint64
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func (x Uint64) m(a, b, c, d, e, f, g, h byte) {
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check("Uint64", int64(x), 0x0102030405060708, a, b, c, d, e, f, g, h)
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}
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var test = []I{
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Int8(0x01),
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Uint8(0x01),
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Int16(0x0102),
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Uint16(0x0102),
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Int32(0x01020304),
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Uint32(0x01020304),
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Int64(0x0102030405060708),
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Uint64(0x0102030405060708),
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}
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func main() {
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for _, t := range test {
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t.m(0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17)
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}
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}
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var bug = false
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func check(desc string, have, want int64, a, b, c, d, e, f, g, h byte) {
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if have != want || a != 0x10 || b != 0x11 || c != 0x12 || d != 0x13 || e != 0x14 || f != 0x15 || g != 0x16 || h != 0x17 {
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if !bug {
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bug = true
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println("BUG")
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}
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println(desc, "check", have, want, a, b, c, d, e, f, g, h)
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}
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}
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