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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"
"flag"
"fmt"
)
// BuilderMode is a bitmask of options for diagnostics and checking.
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 modeFlagUsage = `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.
`
// BuilderModeFlag creates a new command line flag of type BuilderMode,
// adds it to the specified flag set, and returns it.
//
// Example:
// var ssabuild = BuilderModeFlag(flag.CommandLine, "ssabuild", 0)
//
func BuilderModeFlag(set *flag.FlagSet, name string, value BuilderMode) *BuilderMode {
set.Var((*builderModeValue)(&value), name, modeFlagUsage)
return &value
}
type builderModeValue BuilderMode // satisfies flag.Value and flag.Getter.
func (v *builderModeValue) 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)
}
}
*v = builderModeValue(mode)
return nil
}
func (v *builderModeValue) Get() interface{} { return BuilderMode(*v) }
func (v *builderModeValue) String() string {
mode := BuilderMode(*v)
var buf bytes.Buffer
if mode&GlobalDebug != 0 {
buf.WriteByte('D')
}
if mode&PrintPackages != 0 {
buf.WriteByte('P')
}
if mode&PrintFunctions != 0 {
buf.WriteByte('F')
}
if mode&LogSource != 0 {
buf.WriteByte('S')
}
if mode&SanityCheckFunctions != 0 {
buf.WriteByte('C')
}
if mode&NaiveForm != 0 {
buf.WriteByte('N')
}
if mode&BuildSerially != 0 {
buf.WriteByte('L')
}
return buf.String()
}
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