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3635b07d16
This CL changes GOEXPERIMENT=unified to insert implicit conversions for multi-valued expressions. Unfortunately, IR doesn't have strong, first-class support for multi-valued expressions, so this CL takes the approach of spilling them to temporary variables, which can then be implicitly converted. This is the same approach taken by walk, but doing it this early does introduce some minor complications: 1. For select case clauses with comma-ok assignments (e.g., `case x, ok := <-ch:`), the compiler middle end wants to see the OAS2RECV assignment is the CommClause.Comm statement. So when constructing select statements, we need to massage this around a little. 2. The extra temporary variables and assignments skew the existing inlining heuristics. As mentioned, the temporaries/assignments will eventually be added (and often optimized away again) anyway, but now they're visible to the inliner. So this CL also kludges the inlining heuristics in this case to keep things comparable. Change-Id: I3e3ea756ad92472ebe28bae3963be61ed7684a75 Reviewed-on: https://go-review.googlesource.com/c/go/+/415244 Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> Reviewed-by: David Chase <drchase@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
25 lines
599 B
Go
25 lines
599 B
Go
// errorcheck -0 -m -l
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//go:build goexperiment.unified
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// +build goexperiment.unified
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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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package escape
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var sink interface{}
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func dotTypeEscape2() { // #13805, #15796
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{
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i := 0
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j := 0
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var ok bool
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var x interface{} = i // ERROR "i does not escape"
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var y interface{} = j // ERROR "j does not escape"
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sink = x.(int) // ERROR "x.\(int\) escapes to heap"
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sink, *(&ok) = y.(int) // ERROR "autotmp_.* escapes to heap"
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}
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}
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