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225f484c88
Add a bunch of extra tests and benchmarks for defer, in preparation for new low-cost (open-coded) implementation of defers (see #34481), - New file defer_test.go that tests a bunch more unusual defer scenarios, including things that might have problems for open-coded defers. - Additions to callers_test.go actually verifying what the stack trace looks like for various panic or panic-recover scenarios. - Additions to crash_test.go testing several more crash scenarios involving recursive panics. - New benchmark in runtime_test.go measuring speed of panic-recover - New CGo benchmark in cgo_test.go calling from Go to C back to Go that shows defer overhead Updates #34481 Change-Id: I423523f3e05fc0229d4277dd00073289a5526188 Reviewed-on: https://go-review.googlesource.com/c/go/+/197017 Run-TryBot: Dan Scales <danscales@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Austin Clements <austin@google.com>
120 lines
3 KiB
Go
120 lines
3 KiB
Go
// asmcheck
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// Copyright 2018 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 codegen
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import "runtime"
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// This file contains code generation tests related to the use of the
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// stack.
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// Check that stack stores are optimized away.
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// 386:"TEXT\t.*, [$]0-"
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// amd64:"TEXT\t.*, [$]0-"
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// arm:"TEXT\t.*, [$]-4-"
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// arm64:"TEXT\t.*, [$]0-"
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// mips:"TEXT\t.*, [$]-4-"
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// ppc64:"TEXT\t.*, [$]0-"
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// ppc64le:"TEXT\t.*, [$]0-"
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// s390x:"TEXT\t.*, [$]0-"
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func StackStore() int {
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var x int
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return *(&x)
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}
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type T struct {
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A, B, C, D int // keep exported fields
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x, y, z int // reset unexported fields
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}
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// Check that large structs are cleared directly (issue #24416).
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// 386:"TEXT\t.*, [$]0-"
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// amd64:"TEXT\t.*, [$]0-"
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// arm:"TEXT\t.*, [$]0-" (spills return address)
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// arm64:"TEXT\t.*, [$]0-"
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// mips:"TEXT\t.*, [$]-4-"
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// ppc64:"TEXT\t.*, [$]0-"
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// ppc64le:"TEXT\t.*, [$]0-"
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// s390x:"TEXT\t.*, [$]0-"
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func ZeroLargeStruct(x *T) {
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t := T{}
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*x = t
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}
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// Check that structs are partially initialised directly (issue #24386).
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// Notes:
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// - 386 fails due to spilling a register
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// amd64:"TEXT\t.*, [$]0-"
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// arm:"TEXT\t.*, [$]0-" (spills return address)
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// arm64:"TEXT\t.*, [$]0-"
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// ppc64:"TEXT\t.*, [$]0-"
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// ppc64le:"TEXT\t.*, [$]0-"
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// s390x:"TEXT\t.*, [$]0-"
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// Note: that 386 currently has to spill a register.
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func KeepWanted(t *T) {
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*t = T{A: t.A, B: t.B, C: t.C, D: t.D}
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}
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// Check that small array operations avoid using the stack (issue #15925).
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// Notes:
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// - 386 fails due to spilling a register
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// - arm & mips fail due to softfloat calls
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// amd64:"TEXT\t.*, [$]0-"
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// arm64:"TEXT\t.*, [$]0-"
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// ppc64:"TEXT\t.*, [$]0-"
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// ppc64le:"TEXT\t.*, [$]0-"
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// s390x:"TEXT\t.*, [$]0-"
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func ArrayAdd64(a, b [4]float64) [4]float64 {
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return [4]float64{a[0] + b[0], a[1] + b[1], a[2] + b[2], a[3] + b[3]}
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}
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// Check that small array initialization avoids using the stack.
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// 386:"TEXT\t.*, [$]0-"
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// amd64:"TEXT\t.*, [$]0-"
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// arm:"TEXT\t.*, [$]0-" (spills return address)
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// arm64:"TEXT\t.*, [$]0-"
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// mips:"TEXT\t.*, [$]-4-"
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// ppc64:"TEXT\t.*, [$]0-"
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// ppc64le:"TEXT\t.*, [$]0-"
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// s390x:"TEXT\t.*, [$]0-"
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func ArrayInit(i, j int) [4]int {
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return [4]int{i, 0, j, 0}
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}
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// Check that assembly output has matching offset and base register
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// (issue #21064).
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func check_asmout(a, b int) int {
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runtime.GC() // use some frame
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// amd64:`.*b\+24\(SP\)`
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// arm:`.*b\+4\(FP\)`
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return b
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}
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// Check that simple functions get promoted to nosplit, even when
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// they might panic in various ways. See issue 31219.
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// amd64:"TEXT\t.*NOSPLIT.*"
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func MightPanic(a []int, i, j, k, s int) {
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_ = a[i] // panicIndex
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_ = a[i:j] // panicSlice
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_ = a[i:j:k] // also panicSlice
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_ = i << s // panicShift
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_ = i / j // panicDivide
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}
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// Put a defer in a loop, so second defer is not open-coded
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func Defer() {
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for i := 0; i < 2; i++ {
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defer func() {}()
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}
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// amd64:`CALL\truntime\.deferprocStack`
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defer func() {}()
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}
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