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Revert "cmd/compile: fix mishandling of unsafe-uintptr arguments with call method in go/defer"

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This reverts commit CL 294849.

Reason for revert: this doesn't actually fix the issue, as revealed
by the noopt builder's failures.

Change-Id: Ib4ea9ceb4d75e46b3b91ec348b365fd8c83316ad
Reviewed-on: https://go-review.googlesource.com/c/go/+/296629
Trust: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
This commit is contained in:
Matthew Dempsky 2021-02-25 21:32:29 +00:00
parent b83d073e9e
commit 9a7fe196e4
4 changed files with 14 additions and 72 deletions
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32
src/cmd/compile/internal/walk/expr.go
View File

@ -503,8 +503,21 @@ func walkCall1(n *ir.CallExpr, init *ir.Nodes) {
}
n.SetWalked(true)
// If this is a method call t.M(...),
// rewrite into a function call T.M(t, ...).
// TODO(mdempsky): Do this right after type checking.
rewriteMethodCall(n)
if n.Op() == ir.OCALLMETH {
withRecv := make([]ir.Node, len(n.Args)+1)
dot := n.X.(*ir.SelectorExpr)
withRecv[0] = dot.X
copy(withRecv[1:], n.Args)
n.Args = withRecv
dot = ir.NewSelectorExpr(dot.Pos(), ir.OXDOT, ir.TypeNode(dot.X.Type()), dot.Selection.Sym)
n.SetOp(ir.OCALLFUNC)
n.X = typecheck.Expr(dot)
}
args := n.Args
params := n.X.Type().Params()
@ -534,23 +547,6 @@ func walkCall1(n *ir.CallExpr, init *ir.Nodes) {
n.Args = args
}
// rewriteMethodCall rewrites a method call t.M(...) into a function call T.M(t, ...).
func rewriteMethodCall(n *ir.CallExpr) {
if n.Op() != ir.OCALLMETH {
return
}
withRecv := make([]ir.Node, len(n.Args)+1)
dot := n.X.(*ir.SelectorExpr)
withRecv[0] = dot.X
copy(withRecv[1:], n.Args)
n.Args = withRecv
dot = ir.NewSelectorExpr(dot.Pos(), ir.OXDOT, ir.TypeNode(dot.X.Type()), dot.Selection.Sym)
n.SetOp(ir.OCALLFUNC)
n.X = typecheck.Expr(dot)
}
// walkDivMod walks an ODIV or OMOD node.
func walkDivMod(n *ir.BinaryExpr, init *ir.Nodes) ir.Node {
n.X = walkExpr(n.X, init)

3
src/cmd/compile/internal/walk/stmt.go
View File

@ -241,9 +241,6 @@ func wrapCall(n *ir.CallExpr, init *ir.Nodes) ir.Node {
init.Append(ir.TakeInit(n)...)
}
// TODO(mdempsky): Do this right after type checking.
rewriteMethodCall(n)
isBuiltinCall := n.Op() != ir.OCALLFUNC && n.Op() != ir.OCALLMETH && n.Op() != ir.OCALLINTER
// Turn f(a, b, []T{c, d, e}...) back into f(a, b, c, d, e).

30
test/fixedbugs/issue24491a.go
View File

@ -48,30 +48,6 @@ func f() int {
return test("return", uintptr(setup()), uintptr(setup()), uintptr(setup()), uintptr(setup()))
}
type S struct{}
//go:noinline
//go:uintptrescapes
func (S) test(s string, p, q uintptr, rest ...uintptr) int {
runtime.GC()
runtime.GC()
if *(*string)(unsafe.Pointer(p)) != "ok" {
panic(s + ": p failed")
}
if *(*string)(unsafe.Pointer(q)) != "ok" {
panic(s + ": q failed")
}
for _, r := range rest {
if *(*string)(unsafe.Pointer(r)) != "ok" {
panic(s + ": r[i] failed")
}
}
done <- true
return 0
}
func main() {
test("normal", uintptr(setup()), uintptr(setup()), uintptr(setup()), uintptr(setup()))
<-done
@ -84,12 +60,6 @@ func main() {
}()
<-done
func() {
s := &S{}
defer s.test("method call", uintptr(setup()), uintptr(setup()))
}()
<-done
f()
<-done
}

21
test/fixedbugs/issue44415.go
View File

@ -1,21 +0,0 @@
// compile
// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build windows
package p
import (
"syscall"
"unsafe"
)
var dllKernel = syscall.NewLazyDLL("Kernel32.dll")
func Call() {
procLocalFree := dllKernel.NewProc("LocalFree")
defer procLocalFree.Call(uintptr(unsafe.Pointer(nil)))
}