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// Copyright 2014 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 runtime_test import ( "bytes" "runtime" "testing" ) const ( typeScalar = 0 typePointer = 1 ) // TestGCInfo tests that various objects in heap, data and bss receive correct GC pointer type info. func TestGCInfo(t *testing.T) { verifyGCInfo(t, "bss Ptr", &bssPtr, infoPtr) verifyGCInfo(t, "bss ScalarPtr", &bssScalarPtr, infoScalarPtr) verifyGCInfo(t, "bss PtrScalar", &bssPtrScalar, infoPtrScalar) verifyGCInfo(t, "bss BigStruct", &bssBigStruct, infoBigStruct()) verifyGCInfo(t, "bss string", &bssString, infoString) verifyGCInfo(t, "bss slice", &bssSlice, infoSlice) verifyGCInfo(t, "bss eface", &bssEface, infoEface) verifyGCInfo(t, "bss iface", &bssIface, infoIface) verifyGCInfo(t, "data Ptr", &dataPtr, infoPtr) verifyGCInfo(t, "data ScalarPtr", &dataScalarPtr, infoScalarPtr) verifyGCInfo(t, "data PtrScalar", &dataPtrScalar, infoPtrScalar) verifyGCInfo(t, "data BigStruct", &dataBigStruct, infoBigStruct()) verifyGCInfo(t, "data string", &dataString, infoString) verifyGCInfo(t, "data slice", &dataSlice, infoSlice) verifyGCInfo(t, "data eface", &dataEface, infoEface) verifyGCInfo(t, "data iface", &dataIface, infoIface) { var x Ptr verifyGCInfo(t, "stack Ptr", &x, infoPtr) runtime.KeepAlive(x) } { var x ScalarPtr verifyGCInfo(t, "stack ScalarPtr", &x, infoScalarPtr) runtime.KeepAlive(x) } { var x PtrScalar verifyGCInfo(t, "stack PtrScalar", &x, infoPtrScalar) runtime.KeepAlive(x) } { var x BigStruct verifyGCInfo(t, "stack BigStruct", &x, infoBigStruct()) runtime.KeepAlive(x) } { var x string verifyGCInfo(t, "stack string", &x, infoString) runtime.KeepAlive(x) } { var x []string verifyGCInfo(t, "stack slice", &x, infoSlice) runtime.KeepAlive(x) } { var x any verifyGCInfo(t, "stack eface", &x, infoEface) runtime.KeepAlive(x) } { var x Iface verifyGCInfo(t, "stack iface", &x, infoIface) runtime.KeepAlive(x) } for i := 0; i < 10; i++ { verifyGCInfo(t, "heap Ptr", runtime.Escape(new(Ptr)), trimDead(infoPtr)) verifyGCInfo(t, "heap PtrSlice", runtime.Escape(&make([]*byte, 10)[0]), trimDead(infoPtr10)) verifyGCInfo(t, "heap ScalarPtr", runtime.Escape(new(ScalarPtr)), trimDead(infoScalarPtr)) verifyGCInfo(t, "heap ScalarPtrSlice", runtime.Escape(&make([]ScalarPtr, 4)[0]), trimDead(infoScalarPtr4)) verifyGCInfo(t, "heap PtrScalar", runtime.Escape(new(PtrScalar)), trimDead(infoPtrScalar)) verifyGCInfo(t, "heap BigStruct", runtime.Escape(new(BigStruct)), trimDead(infoBigStruct())) verifyGCInfo(t, "heap string", runtime.Escape(new(string)), trimDead(infoString)) verifyGCInfo(t, "heap eface", runtime.Escape(new(any)), trimDead(infoEface)) verifyGCInfo(t, "heap iface", runtime.Escape(new(Iface)), trimDead(infoIface)) } } func verifyGCInfo(t *testing.T, name string, p any, mask0 []byte) { mask := runtime.GCMask(p) if bytes.HasPrefix(mask, mask0) { // Just the prefix matching is OK. // // The Go runtime's pointer/scalar iterator generates pointers beyond // the size of the type, up to the size of the size class. This space // is safe for the GC to scan since it's zero, and GCBits checks to // make sure that's true. But we need to handle the fact that the bitmap // may be larger than we expect. return } t.Errorf("bad GC program for %v:\nwant %+v\ngot %+v", name, mask0, mask) } func trimDead(mask []byte) []byte { for len(mask) > 0 && mask[len(mask)-1] == typeScalar { mask = mask[:len(mask)-1] } return mask } var infoPtr = []byte{typePointer} type Ptr struct { *byte } var infoPtr10 = []byte{typePointer, typePointer, typePointer, typePointer, typePointer, typePointer, typePointer, typePointer, typePointer, typePointer} type ScalarPtr struct { q int w *int e int r *int t int y *int } var infoScalarPtr = []byte{typeScalar, typePointer, typeScalar, typePointer, typeScalar, typePointer} var infoScalarPtr4 = append(append(append(append([]byte(nil), infoScalarPtr...), infoScalarPtr...), infoScalarPtr...), infoScalarPtr...) type PtrScalar struct { q *int w int e *int r int t *int y int } var infoPtrScalar = []byte{typePointer, typeScalar, typePointer, typeScalar, typePointer, typeScalar} type BigStruct struct { q *int w byte e [17]byte r []byte t int y uint16 u uint64 i string } func infoBigStruct() []byte { switch runtime.GOARCH { case "386", "arm", "mips", "mipsle": return []byte{ typePointer, // q *int typeScalar, typeScalar, typeScalar, typeScalar, typeScalar, // w byte; e [17]byte typePointer, typeScalar, typeScalar, // r []byte typeScalar, typeScalar, typeScalar, typeScalar, // t int; y uint16; u uint64 typePointer, typeScalar, // i string } case "arm64", "amd64", "loong64", "mips64", "mips64le", "ppc64", "ppc64le", "riscv64", "s390x", "wasm": return []byte{ typePointer, // q *int typeScalar, typeScalar, typeScalar, // w byte; e [17]byte typePointer, typeScalar, typeScalar, // r []byte typeScalar, typeScalar, typeScalar, // t int; y uint16; u uint64 typePointer, typeScalar, // i string } default: panic("unknown arch") } } type Iface interface { f() } type IfaceImpl int func (IfaceImpl) f() { } var ( // BSS bssPtr Ptr bssScalarPtr ScalarPtr bssPtrScalar PtrScalar bssBigStruct BigStruct bssString string bssSlice []string bssEface any bssIface Iface // DATA dataPtr = Ptr{new(byte)} dataScalarPtr = ScalarPtr{q: 1} dataPtrScalar = PtrScalar{w: 1} dataBigStruct = BigStruct{w: 1} dataString = "foo" dataSlice = []string{"foo"} dataEface any = 42 dataIface Iface = IfaceImpl(42) infoString = []byte{typePointer, typeScalar} infoSlice = []byte{typePointer, typeScalar, typeScalar} infoEface = []byte{typeScalar, typePointer} infoIface = []byte{typeScalar, typePointer} )