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https://github.com/golang/go
synced 2024-11-12 08:20:22 -07:00
runtime, gc: call interface conversion routines by reference.
Part of getting rid of vararg C calls. R=golang-dev, bradfitz CC=golang-dev https://golang.org/cl/23310043
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@ -42,8 +42,8 @@ char *runtimeimport =
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"func @\"\".typ2Itab (@\"\".typ·2 *byte, @\"\".typ2·3 *byte, @\"\".cache·4 **byte) (@\"\".ret·1 *byte)\n"
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"func @\"\".convI2E (@\"\".elem·2 any) (@\"\".ret·1 any)\n"
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"func @\"\".convI2I (@\"\".typ·2 *byte, @\"\".elem·3 any) (@\"\".ret·1 any)\n"
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"func @\"\".convT2E (@\"\".typ·2 *byte, @\"\".elem·3 any) (@\"\".ret·1 any)\n"
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"func @\"\".convT2I (@\"\".typ·2 *byte, @\"\".typ2·3 *byte, @\"\".cache·4 **byte, @\"\".elem·5 any) (@\"\".ret·1 any)\n"
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"func @\"\".convT2E (@\"\".typ·2 *byte, @\"\".elem·3 *any) (@\"\".ret·1 any)\n"
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"func @\"\".convT2I (@\"\".typ·2 *byte, @\"\".typ2·3 *byte, @\"\".cache·4 **byte, @\"\".elem·5 *any) (@\"\".ret·1 any)\n"
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"func @\"\".assertE2E (@\"\".typ·2 *byte, @\"\".iface·3 any) (@\"\".ret·1 any)\n"
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"func @\"\".assertE2E2 (@\"\".typ·3 *byte, @\"\".iface·4 any) (@\"\".ret·1 any, @\"\".ok·2 bool)\n"
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"func @\"\".assertE2I (@\"\".typ·2 *byte, @\"\".iface·3 any) (@\"\".ret·1 any)\n"
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@ -58,8 +58,8 @@ func slicestringcopy(to any, fr any) int
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func typ2Itab(typ *byte, typ2 *byte, cache **byte) (ret *byte)
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func convI2E(elem any) (ret any)
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func convI2I(typ *byte, elem any) (ret any)
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func convT2E(typ *byte, elem any) (ret any)
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func convT2I(typ *byte, typ2 *byte, cache **byte, elem any) (ret any)
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func convT2E(typ *byte, elem *any) (ret any)
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func convT2I(typ *byte, typ2 *byte, cache **byte, elem *any) (ret any)
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// interface type assertions x.(T)
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func assertE2E(typ *byte, iface any) (ret any)
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@ -898,7 +898,20 @@ walkexpr(Node **np, NodeList **init)
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goto ret;
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}
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}
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ll = list(ll, n->left);
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if(isinter(n->left->type)) {
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ll = list(ll, n->left);
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} else {
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// regular types are passed by reference to avoid C vararg calls
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if(islvalue(n->left)) {
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ll = list(ll, nod(OADDR, n->left, N));
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} else {
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var = temp(n->left->type);
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n1 = nod(OAS, var, n->left);
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typecheck(&n1, Etop);
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*init = list(*init, n1);
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ll = list(ll, nod(OADDR, var, N));
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}
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}
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argtype(fn, n->left->type);
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argtype(fn, n->type);
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dowidth(fn->type);
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@ -183,42 +183,31 @@ runtime·typ2Itab(Type *t, InterfaceType *inter, Itab **cache, Itab *ret)
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FLUSH(&ret);
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}
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// func convT2I(typ *byte, typ2 *byte, cache **byte, elem any) (ret any)
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// func convT2I(typ *byte, typ2 *byte, cache **byte, elem *any) (ret any)
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#pragma textflag NOSPLIT
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void
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runtime·convT2I(Type *t, InterfaceType *inter, Itab **cache, ...)
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runtime·convT2I(Type *t, InterfaceType *inter, Itab **cache, byte *elem, Iface ret)
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{
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byte *elem;
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Iface *ret;
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Itab *tab;
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int32 wid;
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elem = (byte*)(&cache+1);
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wid = t->size;
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ret = (Iface*)(elem + ROUND(wid, Structrnd));
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tab = runtime·atomicloadp(cache);
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if(!tab) {
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tab = itab(inter, t, 0);
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runtime·atomicstorep(cache, tab);
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}
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ret->tab = tab;
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copyin(t, elem, &ret->data);
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ret.tab = tab;
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copyin(t, elem, &ret.data);
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FLUSH(&ret);
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}
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// func convT2E(typ *byte, elem any) (ret any)
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// func convT2E(typ *byte, elem *any) (ret any)
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#pragma textflag NOSPLIT
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void
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runtime·convT2E(Type *t, ...)
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runtime·convT2E(Type *t, byte *elem, Eface ret)
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{
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byte *elem;
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Eface *ret;
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int32 wid;
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elem = (byte*)(&t+1);
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wid = t->size;
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ret = (Eface*)(elem + ROUND(wid, Structrnd));
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ret->type = t;
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copyin(t, elem, &ret->data);
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ret.type = t;
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copyin(t, elem, &ret.data);
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FLUSH(&ret);
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}
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static void assertI2Tret(Type *t, Iface i, byte *ret);
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