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0b07bbd2be
This patch changes the inliner to use callsite scores when deciding to inline as opposed to looking only at callee cost/hairyness. For this to work, we have to relax the inline budget cutoff as part of CanInline to allow for the possibility that a given function might start off with a cost of N where N > 80, but then be called from a callsites whose score is less than 80. Once a given function F in package P has been approved by CanInline (based on the relaxed budget) it will then be emitted as part of the export data, meaning that other packages importing P will need to also need to compute callsite scores appropriately. For a function F that calls function G, if G is marked as potentially inlinable then the hairyness computation for F will use G's cost for the call to G as opposed to the default call cost; for this to work with the new scheme (given relaxed cost change described above) we use G's cost only if it falls below inlineExtraCallCost, otherwise just use inlineExtraCallCost. Included in this patch are a bunch of skips and workarounds to selected 'errorcheck' tests in the <GOROOT>/test directory to deal with the additional "can inline" messages emitted when the new inliner is turned on. Change-Id: I9be5f8cd0cd8676beb4296faf80d2f6be7246335 Reviewed-on: https://go-review.googlesource.com/c/go/+/519197 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
60 lines
1.4 KiB
Go
60 lines
1.4 KiB
Go
// errorcheck -0 -m
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//go:build !goexperiment.newinliner
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// Copyright 2010 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, using compiler diagnostic flags, that the escape analysis is working.
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// Compiles but does not run. Inlining is enabled.
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package foo
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var p *int
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func alloc(x int) *int { // ERROR "can inline alloc" "moved to heap: x"
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return &x
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}
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var f func()
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func f1() {
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p = alloc(2) // ERROR "inlining call to alloc" "moved to heap: x"
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// Escape analysis used to miss inlined code in closures.
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func() { // ERROR "can inline f1.func1"
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p = alloc(3) // ERROR "inlining call to alloc"
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}() // ERROR "inlining call to f1.func1" "inlining call to alloc" "moved to heap: x"
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f = func() { // ERROR "func literal escapes to heap" "can inline f1.func2"
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p = alloc(3) // ERROR "inlining call to alloc" "moved to heap: x"
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}
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f()
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}
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func f2() {} // ERROR "can inline f2"
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// No inline for recover; panic now allowed to inline.
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func f3() { panic(1) } // ERROR "can inline f3" "1 escapes to heap"
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func f4() { recover() }
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func f5() *byte { // ERROR "can inline f5"
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type T struct {
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x [1]byte
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}
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t := new(T) // ERROR "new.T. escapes to heap"
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return &t.x[0]
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}
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func f6() *byte { // ERROR "can inline f6"
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type T struct {
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x struct {
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y byte
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}
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}
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t := new(T) // ERROR "new.T. escapes to heap"
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return &t.x.y
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}
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