[release-branch.go1.16] cmd/compile: only update source type when processing struct/array

This is backport of CL 3651594, with the test from CL 360057.

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 #49391

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>
Reviewed-on: https://go-review.googlesource.com/c/go/+/361597
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

src/cmd/compile/internal/ssa/expand_calls.go

@@ -527,6 +527,7 @@ func expandCalls(f *Func) {
 				// it could be a leaf type, but the "leaf" could be complex64 (for example)
 				return storeArgOrLoad(pos, b, base, source, mem, t, offset)
 			}
+			source.Type = t
 			for i := int64(0); i < t.NumElem(); i++ {
 				sel := source.Block.NewValue1I(pos, OpArraySelect, elt, i, source)
 				mem = storeArgOrLoad(pos, b, base, sel, mem, elt, offset+i*elt.Width)
@@ -559,6 +560,7 @@ func expandCalls(f *Func) {
 				return storeArgOrLoad(pos, b, base, source, mem, t, offset)
 			}
 
+			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)

test/fixedbugs/issue49249.go

@@ -0,0 +1,55 @@
+// compile -l
+
+// 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() int {
+	var a, b struct {
+		s struct {
+			s struct {
+				byte
+				float32
+			}
+		}
+	}
+	_ = a
+
+	return func() int {
+		return func() int {
+			a = struct {
+				s struct {
+					s struct {
+						byte
+						float32
+					}
+				}
+			}{b.s}
+			return 0
+		}()
+	}()
+}
+
+func g() int {
+	var a, b struct {
+		s [1][1]struct {
+			byte
+			float32
+		}
+	}
+	_ = a
+
+	return func() int {
+		return func() int {
+			a = struct {
+				s [1][1]struct {
+					byte
+					float32
+				}
+			}{b.s}
+			return 0
+		}()
+	}()
+}

test/fixedbugs/issue49378.go

@@ -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))
+	}()
+}