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test/devirtualization_nil_panics.go
100 строк
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cuishuang
all: fix a lot of spelling mistakes
01 май 2026, 23:52
01 май 2026, 23:52
4e07833
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// run // Copyright 2025 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 main import ( "fmt" "runtime" "strings" ) type A interface{ A() } type Impl struct{} func (*Impl) A() {} type Impl2 struct{} func (*Impl2) A() {} func main() { shouldNilPanic(28, func() { var v A v.A() v = &Impl{} }) shouldNilPanic(36, func() { var v A defer func() { v = &Impl{} }() v.A() }) shouldNilPanic(43, func() { var v A f := func() { v = &Impl{} } v.A() f() }) // Make sure that both devirtualized and non devirtualized // variants have the panic at the same line. shouldNilPanic(55, func() { var v A defer func() { v = &Impl{} }() v. // A() is on a separate line A() }) shouldNilPanic(64, func() { var v A defer func() { v = &Impl{} v = &Impl2{} // assign different type, such that the call below does not get devirtualized }() v. // A() is on a separate line A() }) } var cnt = 0 func shouldNilPanic(wantLine int, f func()) { cnt++ defer func() { p := recover() if p == nil { panic("no nil deref panic") } if strings.Contains(fmt.Sprintf("%s", p), "invalid memory address or nil pointer dereference") { callers := make([]uintptr, 128) n := runtime.Callers(0, callers) callers = callers[:n] frames := runtime.CallersFrames(callers) line := -1 for f, next := frames.Next(); next; f, next = frames.Next() { if f.Func.Name() == fmt.Sprintf("main.main.func%v", cnt) { line = f.Line break } } if line != wantLine { panic(fmt.Sprintf("invalid line number in panic = %v; want = %v", line, wantLine)) } return } panic(p) }() f() }