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// 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 ssa
// 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 = ssa.BuilderMode(0)
// func init() { flag.Var(&mode, "build", ssa.BuilderModeDoc) }
//
type BuilderMode uint
const (
PrintPackages BuilderMode = 1 << iota // Print package inventory to stdout
PrintFunctions // Print function SSA code to stdout
LogSource // Log source locations as SSA builder progresses
SanityCheckFunctions // Perform sanity checking of function bodies
NaiveForm // Build naïve SSA form: don't replace local loads/stores with registers
BuildSerially // Build packages serially, not in parallel.
GlobalDebug // Enable debug info for all packages
BareInits // Build init functions without guards or calls to dependent inits
)
const BuilderModeDoc = `Options controlling the SSA builder.
The value is a sequence of zero or more of these letters:
C perform sanity [C]hecking of the SSA form.
D include [D]ebug info for every function.
P print [P]ackage inventory.
F print [F]unction SSA code.
S log [S]ource locations as SSA builder progresses.
L build distinct packages seria[L]ly instead of in parallel.
N build [N]aive SSA form: don't replace local loads/stores with registers.
I build bare [I]nit functions: no init guards or calls to dependent inits.
`
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&LogSource != 0 {
buf.WriteByte('S')
}
if m&SanityCheckFunctions != 0 {
buf.WriteByte('C')
}
if m&NaiveForm != 0 {
buf.WriteByte('N')
}
if m&BuildSerially != 0 {
buf.WriteByte('L')
}
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 'S':
mode |= LogSource | BuildSerially
case 'C':
mode |= SanityCheckFunctions
case 'N':
mode |= NaiveForm
case 'L':
mode |= BuildSerially
default:
return fmt.Errorf("unknown BuilderMode option: %q", c)
}
}
*m = mode
return nil
}
// Get returns m.
func (m BuilderMode) Get() interface{} { return m }