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https://github.com/golang/go
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![Clément Chigot](/assets/img/avatar_default.png)
This commit adapts compile tool to create correct nilchecks for AIX. AIX allows to load a nil pointer. Therefore, the default nilcheck which issues a load must be replaced by a CMP instruction followed by a store at 0x0 if the value is nil. The store will trigger a SIGSEGV as on others OS. The nilcheck algorithm must be adapted to do not remove nilcheck if it's only a read. Stores are detected with v.Type.IsMemory(). Tests related to nilptr must be adapted to the previous changements. nilptr.go cannot be used as it's because the AIX address space starts at 1<<32. Change-Id: I9f5aaf0b7e185d736a9b119c0ed2fe4e5bd1e7af Reviewed-on: https://go-review.googlesource.com/c/144538 Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
252 lines
5.6 KiB
Go
252 lines
5.6 KiB
Go
// errorcheck -0 -d=nil
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// +build !wasm
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// +build !aix
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// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test that nil checks are removed.
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// Optimization is enabled.
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package p
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type Struct struct {
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X int
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Y float64
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}
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type BigStruct struct {
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X int
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Y float64
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A [1 << 20]int
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Z string
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}
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type Empty struct {
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}
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type Empty1 struct {
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Empty
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}
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var (
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intp *int
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arrayp *[10]int
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array0p *[0]int
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bigarrayp *[1 << 26]int
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structp *Struct
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bigstructp *BigStruct
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emptyp *Empty
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empty1p *Empty1
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)
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func f1() {
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_ = *intp // ERROR "generated nil check"
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// This one should be removed but the block copy needs
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// to be turned into its own pseudo-op in order to see
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// the indirect.
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_ = *arrayp // ERROR "generated nil check"
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// 0-byte indirect doesn't suffice.
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// we don't registerize globals, so there are no removed.* nil checks.
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_ = *array0p // ERROR "generated nil check"
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_ = *array0p // ERROR "removed nil check"
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_ = *intp // ERROR "removed nil check"
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_ = *arrayp // ERROR "removed nil check"
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_ = *structp // ERROR "generated nil check"
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_ = *emptyp // ERROR "generated nil check"
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_ = *arrayp // ERROR "removed nil check"
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}
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func f2() {
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var (
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intp *int
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arrayp *[10]int
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array0p *[0]int
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bigarrayp *[1 << 20]int
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structp *Struct
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bigstructp *BigStruct
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emptyp *Empty
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empty1p *Empty1
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)
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_ = *intp // ERROR "generated nil check"
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_ = *arrayp // ERROR "generated nil check"
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_ = *array0p // ERROR "generated nil check"
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_ = *array0p // ERROR "removed.* nil check"
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_ = *intp // ERROR "removed.* nil check"
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_ = *arrayp // ERROR "removed.* nil check"
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_ = *structp // ERROR "generated nil check"
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_ = *emptyp // ERROR "generated nil check"
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_ = *arrayp // ERROR "removed.* nil check"
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_ = *bigarrayp // ERROR "generated nil check" ARM removed nil check before indirect!!
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_ = *bigstructp // ERROR "generated nil check"
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_ = *empty1p // ERROR "generated nil check"
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}
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func fx10k() *[10000]int
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var b bool
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func f3(x *[10000]int) {
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// Using a huge type and huge offsets so the compiler
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// does not expect the memory hardware to fault.
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_ = x[9999] // ERROR "generated nil check"
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for {
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if x[9999] != 0 { // ERROR "removed nil check"
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break
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}
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}
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x = fx10k()
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_ = x[9999] // ERROR "generated nil check"
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if b {
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_ = x[9999] // ERROR "removed.* nil check"
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} else {
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_ = x[9999] // ERROR "removed.* nil check"
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}
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_ = x[9999] // ERROR "removed nil check"
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x = fx10k()
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if b {
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_ = x[9999] // ERROR "generated nil check"
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} else {
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_ = x[9999] // ERROR "generated nil check"
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}
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_ = x[9999] // ERROR "generated nil check"
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fx10k()
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// This one is a bit redundant, if we figured out that
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// x wasn't going to change across the function call.
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// But it's a little complex to do and in practice doesn't
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// matter enough.
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_ = x[9999] // ERROR "removed nil check"
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}
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func f3a() {
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x := fx10k()
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y := fx10k()
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z := fx10k()
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_ = &x[9] // ERROR "generated nil check"
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y = z
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_ = &x[9] // ERROR "removed.* nil check"
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x = y
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_ = &x[9] // ERROR "generated nil check"
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}
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func f3b() {
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x := fx10k()
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y := fx10k()
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_ = &x[9] // ERROR "generated nil check"
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y = x
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_ = &x[9] // ERROR "removed.* nil check"
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x = y
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_ = &x[9] // ERROR "removed.* nil check"
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}
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func fx10() *[10]int
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func f4(x *[10]int) {
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// Most of these have no checks because a real memory reference follows,
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// and the offset is small enough that if x is nil, the address will still be
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// in the first unmapped page of memory.
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_ = x[9] // ERROR "generated nil check" // bug: would like to remove this check (but nilcheck and load are in different blocks)
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for {
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if x[9] != 0 { // ERROR "removed nil check"
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break
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}
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}
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x = fx10()
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_ = x[9] // ERROR "generated nil check" // bug would like to remove before indirect
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if b {
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_ = x[9] // ERROR "removed nil check"
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} else {
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_ = x[9] // ERROR "removed nil check"
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}
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_ = x[9] // ERROR "removed nil check"
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x = fx10()
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if b {
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_ = x[9] // ERROR "generated nil check" // bug would like to remove before indirect
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} else {
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_ = &x[9] // ERROR "generated nil check"
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}
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_ = x[9] // ERROR "generated nil check" // bug would like to remove before indirect
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fx10()
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_ = x[9] // ERROR "removed nil check"
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x = fx10()
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y := fx10()
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_ = &x[9] // ERROR "generated nil check"
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y = x
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_ = &x[9] // ERROR "removed[a-z ]* nil check"
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x = y
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_ = &x[9] // ERROR "removed[a-z ]* nil check"
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}
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func m1(m map[int][80]byte) byte {
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v := m[3] // ERROR "removed nil check"
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return v[5]
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}
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func m2(m map[int][800]byte) byte {
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v := m[3] // ERROR "removed nil check"
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return v[5]
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}
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func m3(m map[int][80]byte) (byte, bool) {
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v, ok := m[3] // ERROR "removed nil check"
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return v[5], ok
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}
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func m4(m map[int][800]byte) (byte, bool) {
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v, ok := m[3] // ERROR "removed nil check"
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return v[5], ok
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}
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func p1() byte {
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p := new([100]byte)
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return p[5] // ERROR "removed nil check"
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}
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// make sure not to do nil check for access of PAUTOHEAP
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//go:noinline
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func (p *Struct) m() {}
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func c1() {
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var x Struct
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func() { x.m() }() // ERROR "removed nil check"
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}
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type SS struct {
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x byte
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}
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type TT struct {
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SS
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}
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func f(t *TT) *byte {
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// See issue 17242.
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s := &t.SS // ERROR "generated nil check"
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return &s.x // ERROR "removed nil check"
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}
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// make sure not to do nil check for newobject
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func f7() (*Struct, float64) {
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t := new(Struct)
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p := &t.Y // ERROR "removed nil check"
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return t, *p // ERROR "removed nil check"
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}
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func f9() []int {
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x := new([1]int)
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x[0] = 1 // ERROR "removed nil check"
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y := x[:] // ERROR "removed nil check"
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return y
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}
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