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Revert "cmd/compile: allow more inlining of functions that construct closures"
This reverts commit http://go.dev/cl//479095 Reason for revert: causes failures in google-internal testing Change-Id: If1018b35be0b8627e2959f116179ada24d44d67c Reviewed-on: https://go-review.googlesource.com/c/go/+/481637 TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Michael Pratt <mpratt@google.com> Run-TryBot: Than McIntosh <thanm@google.com>
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@ -446,8 +446,6 @@ func (v *hairyVisitor) tooHairy(fn *ir.Func) bool {
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return false
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}
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// doNode visits n and its children, updates the state in v, and returns true if
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// n makes the current function too hairy for inlining.
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func (v *hairyVisitor) doNode(n ir.Node) bool {
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if n == nil {
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return false
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@ -579,10 +577,13 @@ func (v *hairyVisitor) doNode(n ir.Node) bool {
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// TODO(danscales): Maybe make budget proportional to number of closure
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// variables, e.g.:
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//v.budget -= int32(len(n.(*ir.ClosureExpr).Func.ClosureVars) * 3)
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// TODO(austin): However, if we're able to inline this closure into
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// v.curFunc, then we actually pay nothing for the closure captures. We
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// should try to account for that if we're going to account for captures.
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v.budget -= 15
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// Scan body of closure (which DoChildren doesn't automatically
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// do) to check for disallowed ops in the body and include the
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// body in the budget.
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if doList(n.(*ir.ClosureExpr).Func.Body, v.do) {
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return true
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}
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case ir.OGO,
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ir.ODEFER,
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@ -232,15 +232,15 @@ func main() {
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{
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c := 3
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func() { // ERROR "can inline main.func26"
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func() { // ERROR "func literal does not escape"
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c = 4
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func() {
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func() { // ERROR "func literal does not escape"
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if c != 4 {
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ppanic("c != 4")
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}
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recover() // prevent inlining
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}()
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}() // ERROR "inlining call to main.func26" "func literal does not escape"
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}()
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if c != 4 {
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ppanic("c != 4")
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}
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@ -248,37 +248,33 @@ func main() {
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{
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a := 2
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// This has an unfortunate exponential growth, where as we visit each
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// function, we inline the inner closure, and that constructs a new
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// function for any closures inside the inner function, and then we
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// revisit those. E.g., func34 and func36 are constructed by the inliner.
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if r := func(x int) int { // ERROR "can inline main.func27"
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if r := func(x int) int { // ERROR "func literal does not escape"
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b := 3
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return func(y int) int { // ERROR "can inline main.func27.1" "can inline main.func34"
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return func(y int) int { // ERROR "can inline main.func27.1"
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c := 5
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return func(z int) int { // ERROR "can inline main.func27.1.1" "can inline main.func27.(func)?2" "can inline main.func34.1" "can inline main.func36"
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return func(z int) int { // ERROR "can inline main.func27.1.1" "can inline main.func27.(func)?2"
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return a*x + b*y + c*z
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}(10) // ERROR "inlining call to main.func27.1.1"
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}(100) // ERROR "inlining call to main.func27.1" "inlining call to main.func27.(func)?2"
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}(1000); r != 2350 { // ERROR "inlining call to main.func27" "inlining call to main.func34" "inlining call to main.func36"
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}(1000); r != 2350 {
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ppanic("r != 2350")
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}
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}
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{
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a := 2
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if r := func(x int) int { // ERROR "can inline main.func28"
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if r := func(x int) int { // ERROR "func literal does not escape"
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b := 3
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return func(y int) int { // ERROR "can inline main.func28.1" "can inline main.func35"
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return func(y int) int { // ERROR "can inline main.func28.1"
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c := 5
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func(z int) { // ERROR "can inline main.func28.1.1" "can inline main.func28.(func)?2" "can inline main.func35.1" "can inline main.func37"
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func(z int) { // ERROR "can inline main.func28.1.1" "can inline main.func28.(func)?2"
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a = a * x
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b = b * y
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c = c * z
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}(10) // ERROR "inlining call to main.func28.1.1"
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return a + c
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}(100) + b // ERROR "inlining call to main.func28.1" "inlining call to main.func28.(func)?2"
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}(1000); r != 2350 { // ERROR "inlining call to main.func28" "inlining call to main.func35" "inlining call to main.func37"
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}(1000); r != 2350 {
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ppanic("r != 2350")
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}
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if a != 2000 {
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