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cmd/compile: fix open defer of method call

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Code generation for open defers failed to account for
presence of method receiver and thus was OFF BY ONE.

Fixes #45062.
Updates #44816.
Updates #40724.

Change-Id: Ia90ea8fd0f7d823e1f757c406f9127136c2ffdd2
Reviewed-on: https://go-review.googlesource.com/c/go/+/302249
Trust: David Chase <drchase@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
David Chase 2021-03-16 12:03:08 -04:00
parent 0ec2c4abba
commit d206ca5cac
2 changed files with 40 additions and 2 deletions
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6
src/cmd/compile/internal/ssagen/ssa.go
View File

@ -353,10 +353,12 @@ func (s *state) emitOpenDeferInfo() {
numArgs++
}
off = dvarint(x, off, int64(numArgs))
argAdjust := 0 // presence of receiver offsets the parameter count.
if r.rcvrNode != nil {
off = dvarint(x, off, -okOffset(r.rcvrNode.FrameOffset()))
off = dvarint(x, off, s.config.PtrSize)
off = dvarint(x, off, 0) // This is okay because defer records use ABI0 (for now)
argAdjust++
}
// TODO(register args) assume abi0 for this?
@ -366,7 +368,7 @@ func (s *state) emitOpenDeferInfo() {
f := getParam(r.n, j)
off = dvarint(x, off, -okOffset(arg.FrameOffset()))
off = dvarint(x, off, f.Type.Size())
off = dvarint(x, off, okOffset(pri.InParam(j).FrameOffset(pri))-ab.LocalsOffset()) // defer does not want the fixed frame adjustment
off = dvarint(x, off, okOffset(pri.InParam(j+argAdjust).FrameOffset(pri))-ab.LocalsOffset()) // defer does not want the fixed frame adjustment
}
}
}
@ -4925,7 +4927,7 @@ func (s *state) call(n *ir.CallExpr, k callKind, returnResultAddr bool) *ssa.Val
callABI = s.f.ABI0
}
params := callABI.ABIAnalyze(n.X.Type(), false /* Do not set (register) nNames from caller side -- can cause races. */ )
params := callABI.ABIAnalyze(n.X.Type(), false /* Do not set (register) nNames from caller side -- can cause races. */)
types.CalcSize(fn.Type())
stksize := params.ArgWidth() // includes receiver, args, and results

36
test/abi/open_defer_1.go Normal file
View File

@ -0,0 +1,36 @@
// run
// 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.
// For #45062, miscompilation of open defer of method invocation
package main
func main() {
var x, y, z int = -1, -2, -3
F(x, y, z)
}
//go:noinline
func F(x, y, z int) {
defer i.M(x, y, z)
defer func() { recover() }()
panic("XXX")
}
type T int
func (t *T) M(x, y, z int) {
if x == -1 && y == -2 && z == -3 {
return
}
println("FAIL: Expected -1, -2, -3, but x, y, z =", x, y, z)
}
var t T = 42
type I interface{ M(x, y, z int) }
var i I = &t