// Name = identifier | "?" | QualifiedName .
//
// If materializePkg is set, the returned package is guaranteed to be set.
// For fully qualified names, the returned package may be a fake package
// (without name, scope, and not in the p.imports map), created for the
// sole purpose of providing a package path. Fake packages are created
// when the package id is not found in the p.imports map; in that case
// we cannot create a real package because we don't have a package name.
// For non-qualified names, the returned package is the imported package.
//
func (p *parser) parseName(materializePkg bool) (pkg *types.Package, name string) {
switch p.tok {
case scanner.Ident:
pkg = p.imports[p.id]
name = p.lit
p.next()
case '?':
// anonymous
pkg = p.imports[p.id]
p.next()
case '@':
// exported name prefixed with package path
var id string
id, name = p.parseQualifiedName()
if materializePkg {
// we don't have a package name - if the package
// doesn't exist yet, create a fake package instead
pkg = p.getPkg(id, "")
if pkg == nil {
pkg = types.NewPackage(id, "")
}
}
default:
p.error("name expected")
}
return
}
func (imp *importer) newPackageInfo(path string) *PackageInfo {
pkg := types.NewPackage(path, "")
if imp.conf.PackageCreated != nil {
imp.conf.PackageCreated(pkg)
}
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 = func(_ map[string]*types.Package, to string) (*types.Package, error) {
return imp.doImport(info, to)
}
tc.Error = info.appendError // appendError wraps the user's Error function
info.checker = types.NewChecker(&tc, imp.conf.fset(), pkg, &info.Info)
imp.typecheckerMu.Lock()
imp.prog.AllPackages[pkg] = info
imp.typecheckerMu.Unlock()
return info
}
// getPkg returns the package for a given id. If the package is
// not found but we have a package name, create the package and
// add it to the p.imports map.
//
func (p *parser) getPkg(id, name string) *types.Package {
// package unsafe is not in the imports map - handle explicitly
if id == "unsafe" {
return types.Unsafe
}
pkg := p.imports[id]
if pkg == nil && name != "" {
pkg = types.NewPackage(id, name)
p.imports[id] = pkg
}
return pkg
}
"reflect"
"unsafe"
"github.com/fzipp/pythia/internal/tools/go/ssa"
"github.com/fzipp/pythia/internal/tools/go/types"
)
type opaqueType struct {
types.Type
name string
}
func (t *opaqueType) String() string { return t.name }
// A bogus "reflect" type-checker package. Shared across interpreters.
var reflectTypesPackage = types.NewPackage("reflect", "reflect")
// rtype is the concrete type the interpreter uses to implement the
// reflect.Type interface. Since its type is opaque to the target
// language, we use a types.Basic.
//
// type rtype <opaque>
var rtypeType = makeNamedType("rtype", &opaqueType{nil, "rtype"})
// error is an (interpreted) named type whose underlying type is string.
// The interpreter uses it for all implementations of the built-in error
// interface that it creates.
// We put it in the "reflect" package for expedience.
//
// type error string
var errorType = makeNamedType("error", &opaqueType{nil, "error"})
// CreateTestMainPackage creates and returns a synthetic "main"
// package that runs all the tests of the supplied packages, similar
// to the one that would be created by the 'go test' tool.
//
// It returns nil if the program contains no tests.
//
func (prog *Program) CreateTestMainPackage(pkgs ...*Package) *Package {
pkgs, tests, benchmarks, examples := FindTests(pkgs)
if len(pkgs) == 0 {
return nil
}
testmain := &Package{
Prog: prog,
Members: make(map[string]Member),
values: make(map[types.Object]Value),
Object: types.NewPackage("test$main", "main"),
}
// Build package's init function.
init := &Function{
name: "init",
Signature: new(types.Signature),
Synthetic: "package initializer",
Pkg: testmain,
Prog: prog,
}
init.startBody()
if testMainStartBodyHook != nil {
testMainStartBodyHook(init)
}
// Initialize packages to test.
var pkgpaths []string
for _, pkg := range pkgs {
var v Call
v.Call.Value = pkg.init
v.setType(types.NewTuple())
init.emit(&v)
pkgpaths = append(pkgpaths, pkg.Object.Path())
}
sort.Strings(pkgpaths)
init.emit(new(Return))
init.finishBody()
testmain.init = init
testmain.Object.MarkComplete()
testmain.Members[init.name] = init
// For debugging convenience, define an unexported const
// that enumerates the packages.
packagesConst := types.NewConst(token.NoPos, testmain.Object, "packages", tString,
exact.MakeString(strings.Join(pkgpaths, " ")))
memberFromObject(testmain, packagesConst, nil)
// Create main *types.Func and *ssa.Function
mainFunc := types.NewFunc(token.NoPos, testmain.Object, "main", new(types.Signature))
memberFromObject(testmain, mainFunc, nil)
main := testmain.Func("main")
main.Synthetic = "test main function"
main.startBody()
if testMainStartBodyHook != nil {
testMainStartBodyHook(main)
}
if testingPkg := prog.ImportedPackage("testing"); testingPkg != nil {
testingMain := testingPkg.Func("Main")
testingMainParams := testingMain.Signature.Params()
// The generated code is as if compiled from this:
//
// func main() {
// match := func(_, _ string) (bool, error) { return true, nil }
// tests := []testing.InternalTest{{"TestFoo", TestFoo}, ...}
// benchmarks := []testing.InternalBenchmark{...}
// examples := []testing.InternalExample{...}
// testing.Main(match, tests, benchmarks, examples)
// }
matcher := &Function{
name: "matcher",
Signature: testingMainParams.At(0).Type().(*types.Signature),
Synthetic: "test matcher predicate",
parent: main,
Pkg: testmain,
Prog: prog,
}
main.AnonFuncs = append(main.AnonFuncs, matcher)
matcher.startBody()
matcher.emit(&Return{Results: []Value{vTrue, nilConst(types.Universe.Lookup("error").Type())}})
matcher.finishBody()
// Emit call: testing.Main(matcher, tests, benchmarks, examples).
var c Call
c.Call.Value = testingMain
c.Call.Args = []Value{
matcher,
testMainSlice(main, tests, testingMainParams.At(1).Type()),
testMainSlice(main, benchmarks, testingMainParams.At(2).Type()),
testMainSlice(main, examples, testingMainParams.At(3).Type()),
}
emitTailCall(main, &c)
} else {
// The program does not import "testing", but FindTests
// returned non-nil, which must mean there were Examples
// but no Tests or Benchmarks.
// We'll simply call them from testmain.main; this will
// ensure they don't panic, but will not check any
// "Output:" comments.
for _, eg := range examples {
var c Call
c.Call.Value = eg
c.setType(types.NewTuple())
main.emit(&c)
}
main.emit(&Return{})
main.currentBlock = nil
}
main.finishBody()
testmain.Members["main"] = main
if prog.mode&PrintPackages != 0 {
printMu.Lock()
testmain.WriteTo(os.Stdout)
printMu.Unlock()
}
if prog.mode&SanityCheckFunctions != 0 {
sanityCheckPackage(testmain)
}
prog.packages[testmain.Object] = testmain
return testmain
}