func (imp *importer) newPackageInfo(path string) *PackageInfo {
pkg := types.NewPackage(path, "")
info := &PackageInfo{
Pkg: pkg,
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),
},
errorFunc: imp.conf.TypeChecker.Error,
}
// Copy the types.Config so we can vary it across PackageInfos.
tc := imp.conf.TypeChecker
tc.IgnoreFuncBodies = false
if f := imp.conf.TypeCheckFuncBodies; f != nil {
tc.IgnoreFuncBodies = !f(path)
}
tc.Import = imp.doImport // doImport wraps the user's importfn, effectively
tc.Error = info.appendError // appendError wraps the user's Error function
info.checker = types.NewChecker(&tc, imp.conf.fset(), pkg, &info.Info)
imp.prog.AllPackages[pkg] = info
return info
}
// BuildPackage builds an SSA 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; SSA code cannot be built for
// those packages. BuildPackage then constructs an ssa.Program with all
// dependency packages created, and builds and returns the SSA 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 ../ssa/example_test.go for an example.
//
func BuildPackage(tc *types.Config, fset *token.FileSet, pkg *types.Package, files []*ast.File, mode ssa.BuilderMode) (*ssa.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 := ssa.NewProgram(fset, mode)
// Create SSA 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.
ssapkg := prog.CreatePackage(pkg, files, info, false)
ssapkg.Build()
return ssapkg, info, nil
}