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runtime: add throwgo

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Fixes #8380.

Also update hashmap.go to use throwgo rather than panic.

LGTM=khr
R=khr, rsc
CC=golang-codereviews
https://golang.org/cl/115860045
This commit is contained in:
Dave Cheney 2014-07-18 16:30:38 +10:00
parent f378f30034
commit ec5d7ba95c
3 changed files with 29 additions and 15 deletions
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28
src/pkg/runtime/hashmap.go
View File

@ -153,9 +153,8 @@ func evacuated(b *bmap) bool {
}
func makemap(t *maptype, hint int64) *hmap {
if unsafe.Sizeof(hmap{}) > 48 {
panic("hmap too large")
throwgo("hmap too large")
}
if hint < 0 || int64(int32(hint)) != hint {
@ -164,7 +163,7 @@ func makemap(t *maptype, hint int64) *hmap {
}
if !ismapkey(t.key) {
panic("runtime.makemap: unsupported map key type")
throwgo("runtime.makemap: unsupported map key type")
}
flags := uint32(0)
@ -182,32 +181,31 @@ func makemap(t *maptype, hint int64) *hmap {
}
bucketsize := dataOffset + bucketCnt*(keysize+valuesize)
if bucketsize != uintptr(t.bucket.size) {
panic("bucketsize wrong")
throwgo("bucketsize wrong")
}
// invariants we depend on. We should probably check these at compile time
// somewhere, but for now we'll do it here.
// TODO: make these throw(), not panic()
if t.key.align > bucketCnt {
panic("key align too big")
throwgo("key align too big")
}
if t.elem.align > bucketCnt {
panic("value align too big")
throwgo("value align too big")
}
if uintptr(t.key.size)%uintptr(t.key.align) != 0 {
panic("key size not a multiple of key align")
throwgo("key size not a multiple of key align")
}
if uintptr(t.elem.size)%uintptr(t.elem.align) != 0 {
panic("value size not a multiple of value align")
throwgo("value size not a multiple of value align")
}
if bucketCnt < 8 {
panic("bucketsize too small for proper alignment")
throwgo("bucketsize too small for proper alignment")
}
if dataOffset%uintptr(t.key.align) != 0 {
panic("need padding in bucket (key)")
throwgo("need padding in bucket (key)")
}
if dataOffset%uintptr(t.elem.align) != 0 {
panic("need padding in bucket (value)")
throwgo("need padding in bucket (value)")
}
// find size parameter which will hold the requested # of elements
@ -570,7 +568,7 @@ func mapiterinit(t *maptype, h *hmap, it *hiter) {
}
if unsafe.Sizeof(hiter{})/ptrSize != 10 {
panic("hash_iter size incorrect") // see ../../cmd/gc/reflect.c
throwgo("hash_iter size incorrect") // see ../../cmd/gc/reflect.c
}
it.t = t
it.h = h
@ -738,7 +736,7 @@ next:
func hashGrow(t *maptype, h *hmap) {
if h.oldbuckets != nil {
panic("evacuation not done in time")
throwgo("evacuation not done in time")
}
oldbuckets := h.buckets
if checkgc {
@ -798,7 +796,7 @@ func evacuate(t *maptype, h *hmap, oldbucket uintptr) {
continue
}
if top < minTopHash {
panic("bad map state")
throwgo("bad map state")
}
k2 := k
if h.flags&indirectKey != 0 {

12
src/pkg/runtime/panic.c
View File

@ -524,6 +524,18 @@ runtime·throw(int8 *s)
runtime·exit(1); // even more not reached
}
void
runtime·throwgo(String s)
{
if(g->m->throwing == 0)
g->m->throwing = 1;
runtime·startpanic();
runtime·printf("fatal error: %S\n", s);
runtime·dopanic(0);
*(int32*)0 = 0; // not reached
runtime·exit(1); // even more not reached
}
void
runtime·panicstring(int8 *s)
{

4
src/pkg/runtime/stubs.go
View File

@ -82,3 +82,7 @@ func gomemeq(a, b unsafe.Pointer, size uintptr) bool
// Code pointer for the nohash algorithm. Used for producing better error messages.
var nohashcode uintptr
// Go version of runtime.throw.
// in panic.c
func throwgo(s string)