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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>
89 lines
1.5 KiB
Go
89 lines
1.5 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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// Tests escape analysis for range of arrays.
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// Compiles but need not run. Inlining is disabled.
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package main
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type A struct {
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b [3]uint64
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}
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type B struct {
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b [3]*uint64
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}
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func f(a A) int {
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for i, x := range &a.b {
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if x != 0 {
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return 64*i + int(x)
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}
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}
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return 0
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}
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func g(a *A) int { // ERROR "g a does not escape"
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for i, x := range &a.b {
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if x != 0 {
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return 64*i + int(x)
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}
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}
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return 0
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}
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func h(a *B) *uint64 { // ERROR "leaking param: a to result ~r1 level=1"
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for i, x := range &a.b {
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if i == 0 {
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return x
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}
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}
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return nil
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}
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func h2(a *B) *uint64 { // ERROR "leaking param: a to result ~r1 level=1"
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p := &a.b
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for i, x := range p {
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if i == 0 {
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return x
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}
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}
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return nil
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}
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// Seems like below should be level=1, not 0.
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func k(a B) *uint64 { // ERROR "leaking param: a to result ~r1 level=0"
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for i, x := range &a.b {
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if i == 0 {
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return x
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}
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}
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return nil
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}
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var sink *uint64
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func main() {
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var a1, a2 A
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var b1, b2, b3, b4 B
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var x1, x2, x3, x4 uint64 // ERROR "moved to heap: x1" "moved to heap: x3"
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b1.b[0] = &x1
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b2.b[0] = &x2
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b3.b[0] = &x3
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b4.b[0] = &x4
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f(a1)
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g(&a2)
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sink = h(&b1)
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h(&b2)
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sink = h2(&b1)
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h2(&b4)
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x1 = 17
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println("*sink=", *sink) // Verify that sink addresses x1
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x3 = 42
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sink = k(b3)
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println("*sink=", *sink) // Verify that sink addresses x3
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}
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