Update and fix staticcheck

vendor/honnef.co/go/tools/ir/irutil/load.go

@@ -0,0 +1,183 @@
+// 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 irutil
+
+// This file defines utility functions for constructing programs in IR form.
+
+import (
+	"go/ast"
+	"go/token"
+	"go/types"
+
+	"golang.org/x/tools/go/loader"
+	"golang.org/x/tools/go/packages"
+	"honnef.co/go/tools/ir"
+)
+
+type Options struct {
+	// Which function, if any, to print in HTML form
+	PrintFunc string
+}
+
+// Packages creates an IR program for a set of packages.
+//
+// The packages must have been loaded from source syntax using the
+// golang.org/x/tools/go/packages.Load function in LoadSyntax or
+// LoadAllSyntax mode.
+//
+// Packages creates an IR package for each well-typed package in the
+// initial list, plus all their dependencies. The resulting list of
+// packages corresponds to the list of initial packages, and may contain
+// a nil if IR code could not be constructed for the corresponding initial
+// package due to type errors.
+//
+// Code for bodies of functions is not built until Build is called on
+// the resulting Program. IR code is constructed only for the initial
+// packages with well-typed syntax trees.
+//
+// The mode parameter controls diagnostics and checking during IR construction.
+//
+func Packages(initial []*packages.Package, mode ir.BuilderMode, opts *Options) (*ir.Program, []*ir.Package) {
+	return doPackages(initial, mode, false, opts)
+}
+
+// AllPackages creates an IR program for a set of packages plus all
+// their dependencies.
+//
+// The packages must have been loaded from source syntax using the
+// golang.org/x/tools/go/packages.Load function in LoadAllSyntax mode.
+//
+// AllPackages creates an IR package for each well-typed package in the
+// initial list, plus all their dependencies. The resulting list of
+// packages corresponds to the list of initial packages, and may contain
+// a nil if IR code could not be constructed for the corresponding
+// initial package due to type errors.
+//
+// Code for bodies of functions is not built until Build is called on
+// the resulting Program. IR code is constructed for all packages with
+// well-typed syntax trees.
+//
+// The mode parameter controls diagnostics and checking during IR construction.
+//
+func AllPackages(initial []*packages.Package, mode ir.BuilderMode, opts *Options) (*ir.Program, []*ir.Package) {
+	return doPackages(initial, mode, true, opts)
+}
+
+func doPackages(initial []*packages.Package, mode ir.BuilderMode, deps bool, opts *Options) (*ir.Program, []*ir.Package) {
+
+	var fset *token.FileSet
+	if len(initial) > 0 {
+		fset = initial[0].Fset
+	}
+
+	prog := ir.NewProgram(fset, mode)
+	if opts != nil {
+		prog.PrintFunc = opts.PrintFunc
+	}
+
+	isInitial := make(map[*packages.Package]bool, len(initial))
+	for _, p := range initial {
+		isInitial[p] = true
+	}
+
+	irmap := make(map[*packages.Package]*ir.Package)
+	packages.Visit(initial, nil, func(p *packages.Package) {
+		if p.Types != nil && !p.IllTyped {
+			var files []*ast.File
+			if deps || isInitial[p] {
+				files = p.Syntax
+			}
+			irmap[p] = prog.CreatePackage(p.Types, files, p.TypesInfo, true)
+		}
+	})
+
+	var irpkgs []*ir.Package
+	for _, p := range initial {
+		irpkgs = append(irpkgs, irmap[p]) // may be nil
+	}
+	return prog, irpkgs
+}
+
+// CreateProgram returns a new program in IR form, given a program
+// loaded from source.  An IR package is created for each transitively
+// error-free package of lprog.
+//
+// Code for bodies of functions is not built until Build is called
+// on the result.
+//
+// The mode parameter controls diagnostics and checking during IR construction.
+//
+// Deprecated: use golang.org/x/tools/go/packages and the Packages
+// function instead; see ir.ExampleLoadPackages.
+//
+func CreateProgram(lprog *loader.Program, mode ir.BuilderMode) *ir.Program {
+	prog := ir.NewProgram(lprog.Fset, mode)
+
+	for _, info := range lprog.AllPackages {
+		if info.TransitivelyErrorFree {
+			prog.CreatePackage(info.Pkg, info.Files, &info.Info, info.Importable)
+		}
+	}
+
+	return prog
+}
+
+// BuildPackage builds an IR program with IR for a single package.
+//
+// It populates pkg by type-checking the specified file ASTs.  All
+// dependencies are loaded using the importer specified by tc, which
+// typically loads compiler export data; IR code cannot be built for
+// those packages.  BuildPackage then constructs an ir.Program with all
+// dependency packages created, and builds and returns the IR package
+// corresponding to pkg.
+//
+// The caller must have set pkg.Path() to the import path.
+//
+// The operation fails if there were any type-checking or import errors.
+//
+// See ../ir/example_test.go for an example.
+//
+func BuildPackage(tc *types.Config, fset *token.FileSet, pkg *types.Package, files []*ast.File, mode ir.BuilderMode) (*ir.Package, *types.Info, error) {
+	if fset == nil {
+		panic("no token.FileSet")
+	}
+	if pkg.Path() == "" {
+		panic("package has no import path")
+	}
+
+	info := &types.Info{
+		Types:      make(map[ast.Expr]types.TypeAndValue),
+		Defs:       make(map[*ast.Ident]types.Object),
+		Uses:       make(map[*ast.Ident]types.Object),
+		Implicits:  make(map[ast.Node]types.Object),
+		Scopes:     make(map[ast.Node]*types.Scope),
+		Selections: make(map[*ast.SelectorExpr]*types.Selection),
+	}
+	if err := types.NewChecker(tc, fset, pkg, info).Files(files); err != nil {
+		return nil, nil, err
+	}
+
+	prog := ir.NewProgram(fset, mode)
+
+	// Create IR packages for all imports.
+	// Order is not significant.
+	created := make(map[*types.Package]bool)
+	var createAll func(pkgs []*types.Package)
+	createAll = func(pkgs []*types.Package) {
+		for _, p := range pkgs {
+			if !created[p] {
+				created[p] = true
+				prog.CreatePackage(p, nil, nil, true)
+				createAll(p.Imports())
+			}
+		}
+	}
+	createAll(pkg.Imports())
+
+	// Create and build the primary package.
+	irpkg := prog.CreatePackage(pkg, files, info, false)
+	irpkg.Build()
+	return irpkg, info, nil
+}