435c0d9fc8
This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.
114 lines
3.1 KiB
Go
114 lines
3.1 KiB
Go
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package buildir defines an Analyzer that constructs the IR
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// of an error-free package and returns the set of all
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// functions within it. It does not report any diagnostics itself but
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// may be used as an input to other analyzers.
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//
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// THIS INTERFACE IS EXPERIMENTAL AND MAY BE SUBJECT TO INCOMPATIBLE CHANGE.
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package buildir
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import (
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"go/ast"
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"go/types"
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"reflect"
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"golang.org/x/tools/go/analysis"
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"honnef.co/go/tools/ir"
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)
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type willExit struct{}
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type willUnwind struct{}
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func (*willExit) AFact() {}
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func (*willUnwind) AFact() {}
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var Analyzer = &analysis.Analyzer{
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Name: "buildir",
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Doc: "build IR for later passes",
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Run: run,
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ResultType: reflect.TypeOf(new(IR)),
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FactTypes: []analysis.Fact{new(willExit), new(willUnwind)},
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}
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// IR provides intermediate representation for all the
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// non-blank source functions in the current package.
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type IR struct {
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Pkg *ir.Package
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SrcFuncs []*ir.Function
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}
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func run(pass *analysis.Pass) (interface{}, error) {
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// Plundered from ssautil.BuildPackage.
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// We must create a new Program for each Package because the
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// analysis API provides no place to hang a Program shared by
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// all Packages. Consequently, IR Packages and Functions do not
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// have a canonical representation across an analysis session of
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// multiple packages. This is unlikely to be a problem in
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// practice because the analysis API essentially forces all
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// packages to be analysed independently, so any given call to
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// Analysis.Run on a package will see only IR objects belonging
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// to a single Program.
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mode := ir.GlobalDebug
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prog := ir.NewProgram(pass.Fset, mode)
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// Create IR packages for all imports.
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// Order is not significant.
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created := make(map[*types.Package]bool)
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var createAll func(pkgs []*types.Package)
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createAll = func(pkgs []*types.Package) {
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for _, p := range pkgs {
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if !created[p] {
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created[p] = true
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irpkg := prog.CreatePackage(p, nil, nil, true)
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for _, fn := range irpkg.Functions {
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if ast.IsExported(fn.Name()) {
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var exit willExit
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var unwind willUnwind
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if pass.ImportObjectFact(fn.Object(), &exit) {
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fn.WillExit = true
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}
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if pass.ImportObjectFact(fn.Object(), &unwind) {
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fn.WillUnwind = true
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}
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}
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}
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createAll(p.Imports())
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}
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}
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}
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createAll(pass.Pkg.Imports())
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// Create and build the primary package.
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irpkg := prog.CreatePackage(pass.Pkg, pass.Files, pass.TypesInfo, false)
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irpkg.Build()
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// Compute list of source functions, including literals,
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// in source order.
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var addAnons func(f *ir.Function)
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funcs := make([]*ir.Function, len(irpkg.Functions))
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copy(funcs, irpkg.Functions)
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addAnons = func(f *ir.Function) {
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for _, anon := range f.AnonFuncs {
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funcs = append(funcs, anon)
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addAnons(anon)
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}
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}
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for _, fn := range irpkg.Functions {
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addAnons(fn)
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if fn.WillExit {
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pass.ExportObjectFact(fn.Object(), new(willExit))
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}
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if fn.WillUnwind {
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pass.ExportObjectFact(fn.Object(), new(willUnwind))
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}
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}
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return &IR{Pkg: irpkg, SrcFuncs: funcs}, nil
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}
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