Update and fix staticcheck

vendor/honnef.co/go/tools/ir/mode.go

@@ -0,0 +1,98 @@
+// Copyright 2015 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.
+
+package ir
+
+// This file defines the BuilderMode type and its command-line flag.
+
+import (
+	"bytes"
+	"fmt"
+)
+
+// BuilderMode is a bitmask of options for diagnostics and checking.
+//
+// *BuilderMode satisfies the flag.Value interface.  Example:
+//
+// 	var mode = ir.BuilderMode(0)
+// 	func init() { flag.Var(&mode, "build", ir.BuilderModeDoc) }
+//
+type BuilderMode uint
+
+const (
+	PrintPackages        BuilderMode = 1 << iota // Print package inventory to stdout
+	PrintFunctions                               // Print function IR code to stdout
+	PrintSource                                  // Print source code when printing function IR
+	LogSource                                    // Log source locations as IR builder progresses
+	SanityCheckFunctions                         // Perform sanity checking of function bodies
+	NaiveForm                                    // Build naïve IR form: don't replace local loads/stores with registers
+	GlobalDebug                                  // Enable debug info for all packages
+)
+
+const BuilderModeDoc = `Options controlling the IR builder.
+The value is a sequence of zero or more of these letters:
+C	perform sanity [C]hecking of the IR form.
+D	include [D]ebug info for every function.
+P	print [P]ackage inventory.
+F	print [F]unction IR code.
+A	print [A]ST nodes responsible for IR instructions
+S	log [S]ource locations as IR builder progresses.
+N	build [N]aive IR form: don't replace local loads/stores with registers.
+`
+
+func (m BuilderMode) String() string {
+	var buf bytes.Buffer
+	if m&GlobalDebug != 0 {
+		buf.WriteByte('D')
+	}
+	if m&PrintPackages != 0 {
+		buf.WriteByte('P')
+	}
+	if m&PrintFunctions != 0 {
+		buf.WriteByte('F')
+	}
+	if m&PrintSource != 0 {
+		buf.WriteByte('A')
+	}
+	if m&LogSource != 0 {
+		buf.WriteByte('S')
+	}
+	if m&SanityCheckFunctions != 0 {
+		buf.WriteByte('C')
+	}
+	if m&NaiveForm != 0 {
+		buf.WriteByte('N')
+	}
+	return buf.String()
+}
+
+// Set parses the flag characters in s and updates *m.
+func (m *BuilderMode) Set(s string) error {
+	var mode BuilderMode
+	for _, c := range s {
+		switch c {
+		case 'D':
+			mode |= GlobalDebug
+		case 'P':
+			mode |= PrintPackages
+		case 'F':
+			mode |= PrintFunctions
+		case 'A':
+			mode |= PrintSource
+		case 'S':
+			mode |= LogSource
+		case 'C':
+			mode |= SanityCheckFunctions
+		case 'N':
+			mode |= NaiveForm
+		default:
+			return fmt.Errorf("unknown BuilderMode option: %q", c)
+		}
+	}
+	*m = mode
+	return nil
+}
+
+// Get returns m.
+func (m BuilderMode) Get() interface{} { return m }