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cmd/gc, runtime: refactor interface inlining decision into compiler

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We need to change the interface value representation for
concurrent garbage collection, so that there is no ambiguity
about whether the data word holds a pointer or scalar.

This CL does NOT make any representation changes.

Instead, it removes representation assumptions from
various pieces of code throughout the tree.
The isdirectiface function in cmd/gc/subr.c is now
the only place that decides that policy.
The policy propagates out from there in the reflect
metadata, as a new flag in the internal kind value.

A follow-up CL will change the representation by
changing the isdirectiface function. If that CL causes
problems, it will be easy to roll back.

Update #8405.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews, r
https://golang.org/cl/129090043
This commit is contained in:
Russ Cox 2014-08-18 21:13:11 -04:00
parent 2e2beb567c
commit 1806a5732b
18 changed files with 230 additions and 105 deletions
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4
src/pkg/runtime/stack.c
View file

@ -585,7 +585,7 @@ adjustpointers(byte **scanp, BitVector *bv, AdjustInfo *adjinfo, Func *f)
break;
case BitsEface:
t = (Type*)scanp[i];
if(t != nil && (t->size > PtrSize || (t->kind & KindNoPointers) == 0)) {
if(t != nil && ((t->kind & KindDirectIface) == 0 || (t->kind & KindNoPointers) == 0)) {
p = scanp[i+1];
if(minp <= p && p < maxp) {
if(StackDebug >= 3)
@ -602,7 +602,7 @@ adjustpointers(byte **scanp, BitVector *bv, AdjustInfo *adjinfo, Func *f)
if(tab != nil) {
t = tab->type;
//runtime·printf(" type=%p\n", t);
if(t->size > PtrSize || (t->kind & KindNoPointers) == 0) {
if((t->kind & KindDirectIface) == 0 || (t->kind & KindNoPointers) == 0) {
p = scanp[i+1];
if(minp <= p && p < maxp) {
if(StackDebug >= 3)