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reflect: test GC bits for slices

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Currently we test bitmap repetitions constructed by the compiler (for
small arrays) and repetitions performed by GC programs (large arrays
and reflect-constructed arrays), but we don't test dynamic repetitions
performed by the runtime for slice backing stores. Add tests that
parallel the array tests using slices.

Change-Id: If4425941a33cc5b20178dd819a7371e347e47585
Reviewed-on: https://go-review.googlesource.com/11422
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Austin Clements 2015-06-24 11:25:28 -04:00
parent 37469a7bcb
commit 4b287553a4
1 changed files with 44 additions and 0 deletions
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44
src/reflect/all_test.go
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@ -4536,6 +4536,25 @@ func verifyGCBits(t *testing.T, typ Type, bits []byte) {
}
}
func verifyGCBitsSlice(t *testing.T, typ Type, cap int, bits []byte) {
// Creating a slice causes the runtime to repeat a bitmap,
// which exercises a different path from making the compiler
// repeat a bitmap for a small array or executing a repeat in
// a GC program.
val := MakeSlice(typ, 0, cap)
data := NewAt(ArrayOf(cap, typ), unsafe.Pointer(val.Pointer()))
heapBits := GCBits(data.Interface())
// Repeat the bitmap for the slice size, trimming scalars in
// the last element.
bits = rep(cap, bits)
for len(bits) > 2 && bits[len(bits)-1] == 0 {
bits = bits[:len(bits)-1]
}
if !bytes.Equal(heapBits, bits) {
t.Errorf("heapBits incorrect for make(%v, 0, %v)\nhave %v\nwant %v", typ, cap, heapBits, bits)
}
}
func TestGCBits(t *testing.T) {
verifyGCBits(t, TypeOf((*byte)(nil)), []byte{1})
@ -4614,6 +4633,31 @@ func TestGCBits(t *testing.T) {
verifyGCBits(t, TypeOf([2][10000]Xptrscalar{}), rep(2*10000, lit(1, 0)))
verifyGCBits(t, ArrayOf(2, ArrayOf(10000, Tptrscalar)), rep(2*10000, lit(1, 0)))
verifyGCBitsSlice(t, TypeOf([]Xptr{}), 0, empty)
verifyGCBitsSlice(t, SliceOf(Tptr), 0, empty)
verifyGCBitsSlice(t, TypeOf([]Xptrscalar{}), 1, lit(1))
verifyGCBitsSlice(t, SliceOf(Tptrscalar), 1, lit(1))
verifyGCBitsSlice(t, TypeOf([]Xscalar{}), 2, lit(0))
verifyGCBitsSlice(t, SliceOf(Tscalar), 2, lit(0))
verifyGCBitsSlice(t, TypeOf([]Xscalar{}), 10000, lit(0))
verifyGCBitsSlice(t, SliceOf(Tscalar), 10000, lit(0))
verifyGCBitsSlice(t, TypeOf([]Xptr{}), 2, lit(1))
verifyGCBitsSlice(t, SliceOf(Tptr), 2, lit(1))
verifyGCBitsSlice(t, TypeOf([]Xptr{}), 10000, lit(1))
verifyGCBitsSlice(t, SliceOf(Tptr), 10000, lit(1))
verifyGCBitsSlice(t, TypeOf([]Xscalarptr{}), 2, lit(0, 1))
verifyGCBitsSlice(t, SliceOf(Tscalarptr), 2, lit(0, 1))
verifyGCBitsSlice(t, TypeOf([]Xscalarptr{}), 10000, lit(0, 1))
verifyGCBitsSlice(t, SliceOf(Tscalarptr), 10000, lit(0, 1))
verifyGCBitsSlice(t, TypeOf([]Xptrscalar{}), 2, lit(1, 0))
verifyGCBitsSlice(t, SliceOf(Tptrscalar), 2, lit(1, 0))
verifyGCBitsSlice(t, TypeOf([]Xptrscalar{}), 10000, lit(1, 0))
verifyGCBitsSlice(t, SliceOf(Tptrscalar), 10000, lit(1, 0))
verifyGCBitsSlice(t, TypeOf([][10000]Xptrscalar{}), 1, rep(10000, lit(1, 0)))
verifyGCBitsSlice(t, SliceOf(ArrayOf(10000, Tptrscalar)), 1, rep(10000, lit(1, 0)))
verifyGCBitsSlice(t, TypeOf([][10000]Xptrscalar{}), 2, rep(10000, lit(1, 0)))
verifyGCBitsSlice(t, SliceOf(ArrayOf(10000, Tptrscalar)), 2, rep(10000, lit(1, 0)))
verifyGCBits(t, TypeOf((chan [100]Xscalar)(nil)), lit(1))
verifyGCBits(t, ChanOf(BothDir, ArrayOf(100, Tscalar)), lit(1))