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e99e9a6e01
The compiler renames anonymous and blank result parameters to ~rN or ~bN, but the current semantics for computing N are rather annoying and difficult to reproduce cleanly. They also lead to difficult to read escape analysis results in tests. This CL changes N to always be calculated as the parameter's index within the function's result parameter tuple. E.g., if a function has a single result, it will now always be named "~r0". The normative change to this CL is fairly simple, but it requires updating a lot of test expectations. Change-Id: I58a3c94de00cb822cb94efe52d115531193c993c Reviewed-on: https://go-review.googlesource.com/c/go/+/323010 Trust: Matthew Dempsky <mdempsky@google.com> Trust: Dan Scales <danscales@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Dan Scales <danscales@google.com>
74 lines
1 KiB
Go
74 lines
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 for function parameters.
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package foo
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var Ssink *string
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type U struct {
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_sp *string
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_spp **string
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}
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func A(sp *string, spp **string) U { // ERROR "leaking param: sp to result ~r0 level=0$" "leaking param: spp to result ~r0 level=0$"
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return U{sp, spp}
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}
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func B(spp **string) U { // ERROR "leaking param: spp to result ~r0 level=0$"
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return U{*spp, spp}
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}
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func tA1() {
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s := "cat"
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sp := &s
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spp := &sp
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u := A(sp, spp)
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_ = u
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println(s)
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}
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func tA2() {
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s := "cat"
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sp := &s
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spp := &sp
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u := A(sp, spp)
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println(*u._sp)
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}
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func tA3() {
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s := "cat"
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sp := &s
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spp := &sp
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u := A(sp, spp)
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println(**u._spp)
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}
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func tB1() {
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s := "cat"
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sp := &s
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spp := &sp
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u := B(spp)
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_ = u
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println(s)
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}
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func tB2() {
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s := "cat"
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sp := &s
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spp := &sp
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u := B(spp)
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println(*u._sp)
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}
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func tB3() {
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s := "cat"
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sp := &s
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spp := &sp
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u := B(spp)
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println(**u._spp)
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}
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