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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>
31 lines
727 B
Go
31 lines
727 B
Go
// Copyright 2020 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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package a
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type I interface{ M() }
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type T int
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func (T) M() {} // ERROR "can inline T.M"
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func E() I { // ERROR "can inline E"
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return T(0) // ERROR "T\(0\) escapes to heap"
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}
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func F(i I) I { // ERROR "can inline F" "leaking param: i to result ~r0 level=0"
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i = nil
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return i
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}
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func g() {
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h := E() // ERROR "inlining call to E" "T\(0\) does not escape"
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h.M() // ERROR "devirtualizing h.M to T"
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// BAD: T(0) could be stack allocated.
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i := F(T(0)) // ERROR "inlining call to F" "T\(0\) escapes to heap"
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// Testing that we do NOT devirtualize here:
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i.M()
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}
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