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master
test/fixedbugs/issue45851.go
68 строк
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David Chase
cmd/compile: make the stack allocator more careful about register args.
03 май 2021, 20:46
03 май 2021, 20:46
90ec257
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// run // 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. // This tickles a stack-allocation bug when the register ABI is enabled. // The original report was from cue, internal/core/adt/equality.go, // function equalVertex. // In the failing case, something bad gets passed to equalTerminal. package main import "fmt" type Kind uint16 type Flag uint16 const ( allKinds Kind = 1 TopKind Kind = (allKinds - 1) ) type Value interface { Kind() Kind } type Vertex struct { BaseValue Value name string } func (v *Vertex) Kind() Kind { return TopKind } func main() { vA := &Vertex{name:"vA",} vB := &Vertex{name:"vB",} vX := &Vertex{name:"vX",} vA.BaseValue = vX vB.BaseValue = vX _ = equalVertex(vA, vB, Flag(1)) } var foo string //go:noinline func (v *Vertex) IsClosedStruct() bool { return true } func equalVertex(x *Vertex, v Value, flags Flag) bool { y, ok := v.(*Vertex) if !ok { return false } v, ok1 := x.BaseValue.(Value) w, ok2 := y.BaseValue.(Value) if !ok1 && !ok2 { return true // both are struct or list. } return equalTerminal(v, w, flags) } //go:noinline func equalTerminal(x Value, y Value, flags Flag) bool { foo = fmt.Sprintf("EQclosed %s %s %d\n", x.(*Vertex).name, y.(*Vertex).name, flags) return true }