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5b20cba50a
we don't want external software to include internal details like mlog. slog.Logger is/will be the standard. we still have mlog for its helper functions, and its handler that logs in concise logfmt used by mox. packages that are not meant for reuse still pass around mlog.Log for convenience. we use golang.org/x/exp/slog because we also support the previous Go toolchain version. with the next Go release, we'll switch to the builtin slog.
53 lines
1.5 KiB
Go
53 lines
1.5 KiB
Go
// Copyright 2022 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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//go:build go1.19 && !go1.20
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package slog
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import (
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"reflect"
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"unsafe"
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)
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type (
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stringptr unsafe.Pointer // used in Value.any when the Value is a string
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groupptr unsafe.Pointer // used in Value.any when the Value is a []Attr
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)
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// StringValue returns a new Value for a string.
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func StringValue(value string) Value {
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hdr := (*reflect.StringHeader)(unsafe.Pointer(&value))
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return Value{num: uint64(hdr.Len), any: stringptr(hdr.Data)}
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}
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func (v Value) str() string {
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var s string
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hdr := (*reflect.StringHeader)(unsafe.Pointer(&s))
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hdr.Data = uintptr(v.any.(stringptr))
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hdr.Len = int(v.num)
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return s
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}
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// String returns Value's value as a string, formatted like fmt.Sprint. Unlike
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// the methods Int64, Float64, and so on, which panic if v is of the
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// wrong kind, String never panics.
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func (v Value) String() string {
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if sp, ok := v.any.(stringptr); ok {
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// Inlining this code makes a huge difference.
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var s string
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hdr := (*reflect.StringHeader)(unsafe.Pointer(&s))
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hdr.Data = uintptr(sp)
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hdr.Len = int(v.num)
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return s
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}
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return string(v.append(nil))
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}
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// GroupValue returns a new Value for a list of Attrs.
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// The caller must not subsequently mutate the argument slice.
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func GroupValue(as ...Attr) Value {
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hdr := (*reflect.SliceHeader)(unsafe.Pointer(&as))
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return Value{num: uint64(hdr.Len), any: groupptr(hdr.Data)}
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}
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