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abefcac10a
For most nodes (e.g., OPTRLIT, OMAKESLICE, OCONVIFACE), escape analysis prints "escapes to heap" or "does not escape" to indicate whether that node's allocation can be heap or stack allocated. These messages are also emitted for OADDR, even though OADDR does not actually allocate anything itself. Moreover, it's redundant because escape analysis already prints "moved to heap" diagnostics when an OADDR node like "&x" causes x to require heap allocation. Because OADDR nodes don't allocate memory, my escape analysis rewrite doesn't naturally emit the "escapes to heap" / "does not escape" diagnostics for them. It's also non-trivial to replicate the exact semantics esc.go uses for OADDR. Since there are so many of these messages, I'm disabling them in this CL by themselves. I modified esc.go to suppress the Warnl calls without any other behavior changes, and then used a shell script to automatically remove any ERROR messages mentioned by run.go in "missing error" or "no match for" lines. Fixes #16300. Updates #23109. Change-Id: I3993e2743c3ff83ccd0893f4e73b366ff8871a57 Reviewed-on: https://go-review.googlesource.com/c/go/+/170319 Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com> Reviewed-by: David Chase <drchase@google.com>
175 lines
4.1 KiB
Go
175 lines
4.1 KiB
Go
// errorcheck -0 -m -l
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// Copyright 2015 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 escape analysis through ... parameters.
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package foo
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func FooN(vals ...*int) (s int) { // ERROR "FooN vals does not escape"
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for _, v := range vals {
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s += *v
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}
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return s
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}
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// Append forces heap allocation and copies entries in vals to heap, therefore they escape to heap.
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func FooNx(x *int, vals ...*int) (s int) { // ERROR "leaking param: x" "leaking param content: vals"
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vals = append(vals, x)
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return FooN(vals...)
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}
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var sink []*int
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func FooNy(x *int, vals ...*int) (s int) { // ERROR "leaking param: x" "leaking param: vals" "leaking param content: vals"
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vals = append(vals, x)
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sink = vals
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return FooN(vals...)
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}
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func FooNz(vals ...*int) (s int) { // ERROR "leaking param: vals"
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sink = vals
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return FooN(vals...)
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}
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func TFooN() {
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for i := 0; i < 1000; i++ {
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var i, j int
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FooN(&i, &j) // ERROR "TFooN ... argument does not escape"
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}
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}
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func TFooNx() {
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for i := 0; i < 1000; i++ {
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var i, j, k int // ERROR "moved to heap: i" "moved to heap: j" "moved to heap: k"
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FooNx(&k, &i, &j) // ERROR "TFooNx ... argument does not escape"
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}
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}
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func TFooNy() {
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for i := 0; i < 1000; i++ {
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var i, j, k int // ERROR "moved to heap: i" "moved to heap: j" "moved to heap: k"
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FooNy(&k, &i, &j) // ERROR "... argument escapes to heap"
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}
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}
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func TFooNz() {
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for i := 0; i < 1000; i++ {
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var i, j int // ERROR "moved to heap: i" "moved to heap: j"
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FooNz(&i, &j) // ERROR "... argument escapes to heap"
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}
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}
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var isink *int32
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func FooI(args ...interface{}) { // ERROR "leaking param content: args"
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for i := 0; i < len(args); i++ {
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switch x := args[i].(type) {
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case nil:
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println("is nil")
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case int32:
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println("is int32")
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case *int32:
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println("is *int32")
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isink = x
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case string:
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println("is string")
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}
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}
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}
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func TFooI() {
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a := int32(1) // ERROR "moved to heap: a"
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b := "cat"
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c := &a
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FooI(a, b, c) // ERROR "a escapes to heap" "b escapes to heap" "c escapes to heap" "TFooI ... argument does not escape"
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}
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func FooJ(args ...interface{}) *int32 { // ERROR "leaking param: args to result ~r1 level=1"
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for i := 0; i < len(args); i++ {
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switch x := args[i].(type) {
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case nil:
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println("is nil")
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case int32:
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println("is int32")
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case *int32:
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println("is *int32")
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return x
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case string:
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println("is string")
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}
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}
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return nil
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}
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func TFooJ1() {
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a := int32(1)
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b := "cat"
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c := &a
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FooJ(a, b, c) // ERROR "TFooJ1 a does not escape" "TFooJ1 b does not escape" "TFooJ1 c does not escape" "TFooJ1 ... argument does not escape"
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}
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func TFooJ2() {
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a := int32(1) // ERROR "moved to heap: a"
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b := "cat"
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c := &a
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isink = FooJ(a, b, c) // ERROR "a escapes to heap" "b escapes to heap" "c escapes to heap" "TFooJ2 ... argument does not escape"
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}
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type fakeSlice struct {
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l int
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a *[4]interface{}
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}
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func FooK(args fakeSlice) *int32 { // ERROR "leaking param: args to result ~r1 level=1"
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for i := 0; i < args.l; i++ {
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switch x := (*args.a)[i].(type) {
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case nil:
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println("is nil")
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case int32:
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println("is int32")
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case *int32:
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println("is *int32")
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return x
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case string:
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println("is string")
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}
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}
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return nil
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}
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func TFooK2() {
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a := int32(1) // ERROR "moved to heap: a"
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b := "cat"
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c := &a
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fs := fakeSlice{3, &[4]interface{}{a, b, c, nil}} // ERROR "a escapes to heap" "b escapes to heap" "c escapes to heap" "TFooK2 &\[4\]interface {} literal does not escape"
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isink = FooK(fs)
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}
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func FooL(args []interface{}) *int32 { // ERROR "leaking param: args to result ~r1 level=1"
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for i := 0; i < len(args); i++ {
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switch x := args[i].(type) {
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case nil:
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println("is nil")
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case int32:
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println("is int32")
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case *int32:
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println("is *int32")
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return x
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case string:
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println("is string")
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}
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}
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return nil
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}
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func TFooL2() {
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a := int32(1) // ERROR "moved to heap: a"
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b := "cat"
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c := &a
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s := []interface{}{a, b, c} // ERROR "a escapes to heap" "b escapes to heap" "c escapes to heap" "TFooL2 \[\]interface {} literal does not escape"
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isink = FooL(s)
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}
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