whatcanGOwrong

go/pkg/mod/golang.org/x/exp@v0.0.0-20230224173230-c95f2b4c22f2/slog/nopc.go

@@ -0,0 +1,49 @@
+// Copyright 2022 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.
+
+// Use the nopc flag for benchmarks, on the assumption
+// that retrieving the pc will become cheap.
+
+//go:build nopc
+
+package slog
+
+import "time"
+
+// LogDepth is like [Logger.Log], but accepts a call depth to adjust the
+// file and line number in the log record. 0 refers to the caller
+// of LogDepth; 1 refers to the caller's caller; and so on.
+func (l *Logger) LogDepth(calldepth int, level Level, msg string, args ...any) {
+	if !l.Enabled(level) {
+		return
+	}
+	l.logPC(nil, 0, level, msg, args...)
+}
+
+// LogAttrsDepth is like [Logger.LogAttrs], but accepts a call depth argument
+// which it interprets like [Logger.LogDepth].
+func (l *Logger) LogAttrsDepth(calldepth int, level Level, msg string, attrs ...Attr) {
+	if !l.Enabled(level) {
+		return
+	}
+	r := NewRecord(time.Now(), level, msg, 0, l.ctx)
+	r.AddAttrs(attrs...)
+	_ = l.Handler().Handle(r)
+}
+
+// logDepthErr is a trivial wrapper around logDepth, just to make the call
+// depths on all paths the same. This is important only for the defaultHandler,
+// which passes a fixed call depth to log.Output. When slog moves to the
+// standard library, we can replace that fixed call depth with logic based on
+// the Record's pc, and remove this function. See the comment on
+// TestConnections/wrap_default_handler.
+func (l *Logger) logDepthErr(err error, calldepth int, level Level, msg string, args ...any) {
+	if !l.Enabled(level) {
+		return
+	}
+	l.logPC(err, 0, level, msg, args...)
+}
+
+// callerPC returns 0 to avoid incurring the cost of runtime.Callers.
+func callerPC(depth int) uintptr { return 0 }