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cmd/compile: only update source type when processing struct/array

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CL 360057 fixed missing update source type in storeArgOrLoad. However,
we should only update the type when processing struct/array. If we
update the type right before calling storeArgOrLoad, we may generate a
value with invalid type, e.g, OpStructSelect with non-struct type.

Fixes #49378

Change-Id: Ib7e10f72f818880f550aae5c9f653db463ce29b0
Reviewed-on: https://go-review.googlesource.com/c/go/+/361594
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Cuong Manh Le 2021-11-05 20:30:38 +07:00
parent a0d661ab0f
commit f249fa27a9
2 changed files with 27 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/cmd/compile/internal/ssa/expand_calls.go
View File

@ -954,11 +954,11 @@ func (x *expandState) storeArgOrLoad(pos src.XPos, b *Block, source, mem *Value,
elt := t.Elem()
if source.Type != t && t.NumElem() == 1 && elt.Size() == t.Size() && t.Size() == x.regSize {
t = removeTrivialWrapperTypes(t)
source.Type = t
// it could be a leaf type, but the "leaf" could be complex64 (for example)
return x.storeArgOrLoad(pos, b, source, mem, t, storeOffset, loadRegOffset, storeRc)
}
eltRO := x.regWidth(elt)
source.Type = t
for i := int64(0); i < t.NumElem(); i++ {
sel := source.Block.NewValue1I(pos, OpArraySelect, elt, i, source)
mem = x.storeArgOrLoad(pos, b, sel, mem, elt, storeOffset+i*elt.Size(), loadRegOffset, storeRc.at(t, 0))
@ -988,11 +988,11 @@ func (x *expandState) storeArgOrLoad(pos src.XPos, b *Block, source, mem *Value,
// v139 is later stored as an intVal == struct{val *big.Int} which naively requires the fields of
// of a *uint8, which does not succeed.
t = removeTrivialWrapperTypes(t)
source.Type = t
// it could be a leaf type, but the "leaf" could be complex64 (for example)
return x.storeArgOrLoad(pos, b, source, mem, t, storeOffset, loadRegOffset, storeRc)
}
source.Type = t
for i := 0; i < t.NumFields(); i++ {
fld := t.Field(i)
sel := source.Block.NewValue1I(pos, OpStructSelect, fld.Type, int64(i), source)

25
test/fixedbugs/issue49378.go Normal file
View File

@ -0,0 +1,25 @@
// compile
// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package p
func f(i int) {
var s1 struct {
s struct{ s struct{ i int } }
}
var s2, s3 struct {
a struct{ i int }
b int
}
func() {
i = 1 + 2*i + s3.a.i + func() int {
s2.a, s2.b = s3.a, s3.b
return 0
}() + func(*int) int {
return s1.s.s.i
}(new(int))
}()
}