80 lines
2.0 KiB
Go
80 lines
2.0 KiB
Go
|
// Copyright 2013 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 irutil // import "honnef.co/go/tools/ir/irutil"
|
||
|
|
|
||
|
|
import "honnef.co/go/tools/ir"
|
||
|
|
|
||
|
|
// This file defines utilities for visiting the IR of
|
||
|
|
// a Program.
|
||
|
|
//
|
||
|
|
// TODO(adonovan): test coverage.
|
||
|
|
|
||
|
|
// AllFunctions finds and returns the set of functions potentially
|
||
|
|
// needed by program prog, as determined by a simple linker-style
|
||
|
|
// reachability algorithm starting from the members and method-sets of
|
||
|
|
// each package. The result may include anonymous functions and
|
||
|
|
// synthetic wrappers.
|
||
|
|
//
|
||
|
|
// Precondition: all packages are built.
|
||
|
|
//
|
||
|
|
func AllFunctions(prog *ir.Program) map[*ir.Function]bool {
|
||
|
|
visit := visitor{
|
||
|
|
prog: prog,
|
||
|
|
seen: make(map[*ir.Function]bool),
|
||
|
|
}
|
||
|
|
visit.program()
|
||
|
|
return visit.seen
|
||
|
|
}
|
||
|
|
|
||
|
|
type visitor struct {
|
||
|
|
prog *ir.Program
|
||
|
|
seen map[*ir.Function]bool
|
||
|
|
}
|
||
|
|
|
||
|
|
func (visit *visitor) program() {
|
||
|
|
for _, pkg := range visit.prog.AllPackages() {
|
||
|
|
for _, mem := range pkg.Members {
|
||
|
|
if fn, ok := mem.(*ir.Function); ok {
|
||
|
|
visit.function(fn)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
for _, T := range visit.prog.RuntimeTypes() {
|
||
|
|
mset := visit.prog.MethodSets.MethodSet(T)
|
||
|
|
for i, n := 0, mset.Len(); i < n; i++ {
|
||
|
|
visit.function(visit.prog.MethodValue(mset.At(i)))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (visit *visitor) function(fn *ir.Function) {
|
||
|
|
if !visit.seen[fn] {
|
||
|
|
visit.seen[fn] = true
|
||
|
|
var buf [10]*ir.Value // avoid alloc in common case
|
||
|
|
for _, b := range fn.Blocks {
|
||
|
|
for _, instr := range b.Instrs {
|
||
|
|
for _, op := range instr.Operands(buf[:0]) {
|
||
|
|
if fn, ok := (*op).(*ir.Function); ok {
|
||
|
|
visit.function(fn)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// MainPackages returns the subset of the specified packages
|
||
|
|
// named "main" that define a main function.
|
||
|
|
// The result may include synthetic "testmain" packages.
|
||
|
|
func MainPackages(pkgs []*ir.Package) []*ir.Package {
|
||
|
|
var mains []*ir.Package
|
||
|
|
for _, pkg := range pkgs {
|
||
|
|
if pkg.Pkg.Name() == "main" && pkg.Func("main") != nil {
|
||
|
|
mains = append(mains, pkg)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return mains
|
||
|
|
}
|