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internal/syscall/windows/registry: make '-gcflags=all=-d=checkptr' flag work

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Mostly replaced [:x] slice operation with [❌x]. 

According to @mdempsky, compiler specially recognizes when you combine
a pointer conversion with a full slice operation in a single expression
and makes an exception.

Updates golang/go#34972

Change-Id: I07d9de3b31da254d55f50d14c18155f8fc8f3ece
Reviewed-on: https://go-review.googlesource.com/c/go/+/203442
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Alex Brainman 2019-10-27 17:13:45 +11:00 committed by Brad Fitzpatrick
parent 25f5044e46
commit 7067aa1c10
1 changed files with 5 additions and 6 deletions
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11
src/internal/syscall/windows/registry/value.go
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@ -108,7 +108,7 @@ func (k Key) GetStringValue(name string) (val string, valtype uint32, err error)
if len(data) == 0 {
return "", typ, nil
}
u := (*[1 << 29]uint16)(unsafe.Pointer(&data[0]))[:len(data)/2]
u := (*[1 << 29]uint16)(unsafe.Pointer(&data[0]))[: len(data)/2 : len(data)/2]
return syscall.UTF16ToString(u), typ, nil
}
@ -185,8 +185,7 @@ func ExpandString(value string) (string, error) {
return "", err
}
if n <= uint32(len(r)) {
u := (*[1 << 29]uint16)(unsafe.Pointer(&r[0]))[:]
return syscall.UTF16ToString(u), nil
return syscall.UTF16ToString(r[:n]), nil
}
r = make([]uint16, n)
}
@ -208,7 +207,7 @@ func (k Key) GetStringsValue(name string) (val []string, valtype uint32, err err
if len(data) == 0 {
return nil, typ, nil
}
p := (*[1 << 29]uint16)(unsafe.Pointer(&data[0]))[:len(data)/2]
p := (*[1 << 29]uint16)(unsafe.Pointer(&data[0]))[: len(data)/2 : len(data)/2]
if len(p) == 0 {
return nil, typ, nil
}
@ -296,7 +295,7 @@ func (k Key) setStringValue(name string, valtype uint32, value string) error {
if err != nil {
return err
}
buf := (*[1 << 29]byte)(unsafe.Pointer(&v[0]))[:len(v)*2]
buf := (*[1 << 29]byte)(unsafe.Pointer(&v[0]))[: len(v)*2 : len(v)*2]
return k.setValue(name, valtype, buf)
}
@ -326,7 +325,7 @@ func (k Key) SetStringsValue(name string, value []string) error {
ss += s + "\x00"
}
v := utf16.Encode([]rune(ss + "\x00"))
buf := (*[1 << 29]byte)(unsafe.Pointer(&v[0]))[:len(v)*2]
buf := (*[1 << 29]byte)(unsafe.Pointer(&v[0]))[: len(v)*2 : len(v)*2]
return k.setValue(name, MULTI_SZ, buf)
}