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runtime, gc: call interface conversion routines by reference.

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Part of getting rid of vararg C calls.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/23310043
This commit is contained in:
Keith Randall 2013-12-17 16:55:06 -08:00
parent bccf029fc0
commit deb554934c
4 changed files with 28 additions and 26 deletions
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4
src/cmd/gc/builtin.c
View File

@ -42,8 +42,8 @@ char *runtimeimport =
"func @\"\".typ2Itab (@\"\".typ·2 *byte, @\"\".typ2·3 *byte, @\"\".cache·4 **byte) (@\"\".ret·1 *byte)\n"
"func @\"\".convI2E (@\"\".elem·2 any) (@\"\".ret·1 any)\n"
"func @\"\".convI2I (@\"\".typ·2 *byte, @\"\".elem·3 any) (@\"\".ret·1 any)\n"
"func @\"\".convT2E (@\"\".typ·2 *byte, @\"\".elem·3 any) (@\"\".ret·1 any)\n"
"func @\"\".convT2I (@\"\".typ·2 *byte, @\"\".typ2·3 *byte, @\"\".cache·4 **byte, @\"\".elem·5 any) (@\"\".ret·1 any)\n"
"func @\"\".convT2E (@\"\".typ·2 *byte, @\"\".elem·3 *any) (@\"\".ret·1 any)\n"
"func @\"\".convT2I (@\"\".typ·2 *byte, @\"\".typ2·3 *byte, @\"\".cache·4 **byte, @\"\".elem·5 *any) (@\"\".ret·1 any)\n"
"func @\"\".assertE2E (@\"\".typ·2 *byte, @\"\".iface·3 any) (@\"\".ret·1 any)\n"
"func @\"\".assertE2E2 (@\"\".typ·3 *byte, @\"\".iface·4 any) (@\"\".ret·1 any, @\"\".ok·2 bool)\n"
"func @\"\".assertE2I (@\"\".typ·2 *byte, @\"\".iface·3 any) (@\"\".ret·1 any)\n"

4
src/cmd/gc/runtime.go
View File

@ -58,8 +58,8 @@ func slicestringcopy(to any, fr any) int
func typ2Itab(typ *byte, typ2 *byte, cache **byte) (ret *byte)
func convI2E(elem any) (ret any)
func convI2I(typ *byte, elem any) (ret any)
func convT2E(typ *byte, elem any) (ret any)
func convT2I(typ *byte, typ2 *byte, cache **byte, elem any) (ret any)
func convT2E(typ *byte, elem *any) (ret any)
func convT2I(typ *byte, typ2 *byte, cache **byte, elem *any) (ret any)
// interface type assertions x.(T)
func assertE2E(typ *byte, iface any) (ret any)

13
src/cmd/gc/walk.c
View File

@ -898,7 +898,20 @@ walkexpr(Node **np, NodeList **init)
goto ret;
}
}
if(isinter(n->left->type)) {
ll = list(ll, n->left);
} else {
// regular types are passed by reference to avoid C vararg calls
if(islvalue(n->left)) {
ll = list(ll, nod(OADDR, n->left, N));
} else {
var = temp(n->left->type);
n1 = nod(OAS, var, n->left);
typecheck(&n1, Etop);
*init = list(*init, n1);
ll = list(ll, nod(OADDR, var, N));
}
}
argtype(fn, n->left->type);
argtype(fn, n->type);
dowidth(fn->type);

31
src/pkg/runtime/iface.c
View File

@ -183,42 +183,31 @@ runtime·typ2Itab(Type *t, InterfaceType *inter, Itab **cache, Itab *ret)
FLUSH(&ret);
}
// func convT2I(typ *byte, typ2 *byte, cache **byte, elem any) (ret any)
// func convT2I(typ *byte, typ2 *byte, cache **byte, elem *any) (ret any)
#pragma textflag NOSPLIT
void
runtime·convT2I(Type *t, InterfaceType *inter, Itab **cache, ...)
runtime·convT2I(Type *t, InterfaceType *inter, Itab **cache, byte *elem, Iface ret)
{
byte *elem;
Iface *ret;
Itab *tab;
int32 wid;
elem = (byte*)(&cache+1);
wid = t->size;
ret = (Iface*)(elem + ROUND(wid, Structrnd));
tab = runtime·atomicloadp(cache);
if(!tab) {
tab = itab(inter, t, 0);
runtime·atomicstorep(cache, tab);
}
ret->tab = tab;
copyin(t, elem, &ret->data);
ret.tab = tab;
copyin(t, elem, &ret.data);
FLUSH(&ret);
}
// func convT2E(typ *byte, elem any) (ret any)
// func convT2E(typ *byte, elem *any) (ret any)
#pragma textflag NOSPLIT
void
runtime·convT2E(Type *t, ...)
runtime·convT2E(Type *t, byte *elem, Eface ret)
{
byte *elem;
Eface *ret;
int32 wid;
elem = (byte*)(&t+1);
wid = t->size;
ret = (Eface*)(elem + ROUND(wid, Structrnd));
ret->type = t;
copyin(t, elem, &ret->data);
ret.type = t;
copyin(t, elem, &ret.data);
FLUSH(&ret);
}
static void assertI2Tret(Type *t, Iface i, byte *ret);