mirror of
https://github.com/golang/go
synced 2024-11-27 05:21:22 -07:00
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>
58 lines
1.3 KiB
Go
58 lines
1.3 KiB
Go
// errorcheck -0 -m
|
|
|
|
// Copyright 2010 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.
|
|
|
|
// Test, using compiler diagnostic flags, that the escape analysis is working.
|
|
// Compiles but does not run. Inlining is enabled.
|
|
|
|
package foo
|
|
|
|
var p *int
|
|
|
|
func alloc(x int) *int { // ERROR "can inline alloc" "moved to heap: x"
|
|
return &x
|
|
}
|
|
|
|
var f func()
|
|
|
|
func f1() {
|
|
p = alloc(2) // ERROR "inlining call to alloc" "moved to heap: x"
|
|
|
|
// Escape analysis used to miss inlined code in closures.
|
|
|
|
func() { // ERROR "can inline f1.func1"
|
|
p = alloc(3) // ERROR "inlining call to alloc"
|
|
}() // ERROR "inlining call to f1.func1" "inlining call to alloc" "moved to heap: x"
|
|
|
|
f = func() { // ERROR "func literal escapes to heap" "can inline f1.func2"
|
|
p = alloc(3) // ERROR "inlining call to alloc" "moved to heap: x"
|
|
}
|
|
f()
|
|
}
|
|
|
|
func f2() {} // ERROR "can inline f2"
|
|
|
|
// No inline for recover; panic now allowed to inline.
|
|
func f3() { panic(1) } // ERROR "can inline f3"
|
|
func f4() { recover() }
|
|
|
|
func f5() *byte {
|
|
type T struct {
|
|
x [1]byte
|
|
}
|
|
t := new(T) // ERROR "new.T. escapes to heap"
|
|
return &t.x[0]
|
|
}
|
|
|
|
func f6() *byte {
|
|
type T struct {
|
|
x struct {
|
|
y byte
|
|
}
|
|
}
|
|
t := new(T) // ERROR "new.T. escapes to heap"
|
|
return &t.x.y
|
|
}
|