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https://github.com/golang/go
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cmd/go/internal/load: split test logic out of pkg.go into test.go
It's going to grow. Change-Id: I4f5d3cce6e03250508d1ae0981a6d82a4192ae31 Reviewed-on: https://go-review.googlesource.com/107915 Run-TryBot: Russ Cox <rsc@golang.org> Reviewed-by: Bryan C. Mills <bcmills@google.com>
This commit is contained in:
Russ Cox
parent
90e860f1a8
commit
90083e658a
@ -1588,200 +1588,3 @@ func GoFilesPackage(gofiles []string) *Package {
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return pkg
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}
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// TestPackagesFor returns package structs ptest, the package p plus
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// its test files, and pxtest, the external tests of package p.
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// pxtest may be nil. If there are no test files, forceTest decides
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// whether this returns a new package struct or just returns p.
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func TestPackagesFor(p *Package, forceTest bool) (ptest, pxtest *Package, err error) {
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var imports, ximports []*Package
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var stk ImportStack
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stk.Push(p.ImportPath + " (test)")
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rawTestImports := str.StringList(p.TestImports)
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for i, path := range p.TestImports {
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p1 := LoadImport(path, p.Dir, p, &stk, p.Internal.Build.TestImportPos[path], UseVendor)
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if p1.Error != nil {
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return nil, nil, p1.Error
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}
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if len(p1.DepsErrors) > 0 {
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err := p1.DepsErrors[0]
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err.Pos = "" // show full import stack
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return nil, nil, err
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}
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if str.Contains(p1.Deps, p.ImportPath) || p1.ImportPath == p.ImportPath {
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// Same error that loadPackage returns (via reusePackage) in pkg.go.
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// Can't change that code, because that code is only for loading the
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// non-test copy of a package.
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err := &PackageError{
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ImportStack: testImportStack(stk[0], p1, p.ImportPath),
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Err: "import cycle not allowed in test",
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IsImportCycle: true,
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}
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return nil, nil, err
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}
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p.TestImports[i] = p1.ImportPath
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imports = append(imports, p1)
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}
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stk.Pop()
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stk.Push(p.ImportPath + "_test")
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pxtestNeedsPtest := false
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rawXTestImports := str.StringList(p.XTestImports)
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for i, path := range p.XTestImports {
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p1 := LoadImport(path, p.Dir, p, &stk, p.Internal.Build.XTestImportPos[path], UseVendor)
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if p1.Error != nil {
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return nil, nil, p1.Error
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}
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if len(p1.DepsErrors) > 0 {
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err := p1.DepsErrors[0]
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err.Pos = "" // show full import stack
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return nil, nil, err
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}
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if p1.ImportPath == p.ImportPath {
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pxtestNeedsPtest = true
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} else {
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ximports = append(ximports, p1)
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}
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p.XTestImports[i] = p1.ImportPath
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}
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stk.Pop()
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// Test package.
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if len(p.TestGoFiles) > 0 || forceTest {
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ptest = new(Package)
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*ptest = *p
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ptest.GoFiles = nil
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ptest.GoFiles = append(ptest.GoFiles, p.GoFiles...)
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ptest.GoFiles = append(ptest.GoFiles, p.TestGoFiles...)
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ptest.Target = ""
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// Note: The preparation of the vet config requires that common
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// indexes in ptest.Imports, ptest.Internal.Imports, and ptest.Internal.RawImports
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// all line up (but RawImports can be shorter than the others).
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// That is, for 0 ≤ i < len(RawImports),
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// RawImports[i] is the import string in the program text,
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// Imports[i] is the expanded import string (vendoring applied or relative path expanded away),
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// and Internal.Imports[i] is the corresponding *Package.
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// Any implicitly added imports appear in Imports and Internal.Imports
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// but not RawImports (because they were not in the source code).
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// We insert TestImports, imports, and rawTestImports at the start of
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// these lists to preserve the alignment.
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ptest.Imports = str.StringList(p.TestImports, p.Imports)
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ptest.Internal.Imports = append(imports, p.Internal.Imports...)
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ptest.Internal.RawImports = str.StringList(rawTestImports, p.Internal.RawImports)
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ptest.Internal.ForceLibrary = true
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ptest.Internal.Build = new(build.Package)
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*ptest.Internal.Build = *p.Internal.Build
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m := map[string][]token.Position{}
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for k, v := range p.Internal.Build.ImportPos {
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m[k] = append(m[k], v...)
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}
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for k, v := range p.Internal.Build.TestImportPos {
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m[k] = append(m[k], v...)
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}
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ptest.Internal.Build.ImportPos = m
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} else {
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ptest = p
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}
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// External test package.
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if len(p.XTestGoFiles) > 0 {
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pxtest = &Package{
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PackagePublic: PackagePublic{
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Name: p.Name + "_test",
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ImportPath: p.ImportPath + "_test",
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Root: p.Root,
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Dir: p.Dir,
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GoFiles: p.XTestGoFiles,
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Imports: p.XTestImports,
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},
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Internal: PackageInternal{
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LocalPrefix: p.Internal.LocalPrefix,
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Build: &build.Package{
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ImportPos: p.Internal.Build.XTestImportPos,
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},
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Imports: ximports,
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RawImports: rawXTestImports,
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Asmflags: p.Internal.Asmflags,
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Gcflags: p.Internal.Gcflags,
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Ldflags: p.Internal.Ldflags,
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Gccgoflags: p.Internal.Gccgoflags,
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},
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}
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if pxtestNeedsPtest {
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pxtest.Internal.Imports = append(pxtest.Internal.Imports, ptest)
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}
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}
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if p != ptest && pxtest != nil {
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// We have made modifications to the package p being tested
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// and are rebuilding p (as ptest).
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// Arrange to rebuild all packages q such that
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// pxtest depends on q and q depends on p.
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// This makes sure that q sees the modifications to p.
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// Strictly speaking, the rebuild is only necessary if the
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// modifications to p change its export metadata, but
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// determining that is a bit tricky, so we rebuild always.
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recompileForTest(p, ptest, pxtest)
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}
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return ptest, pxtest, nil
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}
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func testImportStack(top string, p *Package, target string) []string {
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stk := []string{top, p.ImportPath}
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Search:
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for p.ImportPath != target {
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for _, p1 := range p.Internal.Imports {
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if p1.ImportPath == target || str.Contains(p1.Deps, target) {
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stk = append(stk, p1.ImportPath)
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p = p1
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continue Search
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}
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}
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// Can't happen, but in case it does...
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stk = append(stk, "<lost path to cycle>")
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break
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}
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return stk
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}
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func recompileForTest(preal, ptest, pxtest *Package) {
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// The "test copy" of preal is ptest.
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// For each package that depends on preal, make a "test copy"
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// that depends on ptest. And so on, up the dependency tree.
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testCopy := map[*Package]*Package{preal: ptest}
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// Only pxtest and its dependencies can legally depend on p.
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// If ptest or its dependencies depended on p, the dependency
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// would be circular.
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for _, p := range PackageList([]*Package{pxtest}) {
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if p == preal {
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continue
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}
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// Copy on write.
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didSplit := p == pxtest
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split := func() {
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if didSplit {
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return
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}
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didSplit = true
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if testCopy[p] != nil {
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panic("recompileForTest loop")
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}
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p1 := new(Package)
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testCopy[p] = p1
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*p1 = *p
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p1.Internal.Imports = make([]*Package, len(p.Internal.Imports))
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copy(p1.Internal.Imports, p.Internal.Imports)
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p = p1
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p.Target = ""
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}
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// Update p.Internal.Imports to use test copies.
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for i, imp := range p.Internal.Imports {
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if p1 := testCopy[imp]; p1 != nil && p1 != imp {
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split()
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p.Internal.Imports[i] = p1
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}
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}
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}
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}
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208
src/cmd/go/internal/load/test.go
Normal file
208
src/cmd/go/internal/load/test.go
Normal file
@ -0,0 +1,208 @@
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// 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 load
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import (
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"cmd/go/internal/str"
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"go/build"
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"go/token"
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)
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// TestPackagesFor returns package structs ptest, the package p plus
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// its test files, and pxtest, the external tests of package p.
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// pxtest may be nil. If there are no test files, forceTest decides
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// whether this returns a new package struct or just returns p.
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func TestPackagesFor(p *Package, forceTest bool) (ptest, pxtest *Package, err error) {
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var imports, ximports []*Package
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var stk ImportStack
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stk.Push(p.ImportPath + " (test)")
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rawTestImports := str.StringList(p.TestImports)
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for i, path := range p.TestImports {
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p1 := LoadImport(path, p.Dir, p, &stk, p.Internal.Build.TestImportPos[path], UseVendor)
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if p1.Error != nil {
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return nil, nil, p1.Error
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}
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if len(p1.DepsErrors) > 0 {
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err := p1.DepsErrors[0]
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err.Pos = "" // show full import stack
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return nil, nil, err
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}
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if str.Contains(p1.Deps, p.ImportPath) || p1.ImportPath == p.ImportPath {
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// Same error that loadPackage returns (via reusePackage) in pkg.go.
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// Can't change that code, because that code is only for loading the
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// non-test copy of a package.
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err := &PackageError{
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ImportStack: testImportStack(stk[0], p1, p.ImportPath),
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Err: "import cycle not allowed in test",
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IsImportCycle: true,
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}
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return nil, nil, err
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}
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p.TestImports[i] = p1.ImportPath
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imports = append(imports, p1)
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}
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stk.Pop()
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stk.Push(p.ImportPath + "_test")
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pxtestNeedsPtest := false
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rawXTestImports := str.StringList(p.XTestImports)
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for i, path := range p.XTestImports {
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p1 := LoadImport(path, p.Dir, p, &stk, p.Internal.Build.XTestImportPos[path], UseVendor)
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if p1.Error != nil {
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return nil, nil, p1.Error
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}
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if len(p1.DepsErrors) > 0 {
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err := p1.DepsErrors[0]
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err.Pos = "" // show full import stack
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return nil, nil, err
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}
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if p1.ImportPath == p.ImportPath {
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pxtestNeedsPtest = true
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} else {
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ximports = append(ximports, p1)
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}
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p.XTestImports[i] = p1.ImportPath
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}
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stk.Pop()
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// Test package.
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if len(p.TestGoFiles) > 0 || forceTest {
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ptest = new(Package)
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*ptest = *p
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ptest.GoFiles = nil
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ptest.GoFiles = append(ptest.GoFiles, p.GoFiles...)
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ptest.GoFiles = append(ptest.GoFiles, p.TestGoFiles...)
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ptest.Target = ""
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// Note: The preparation of the vet config requires that common
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// indexes in ptest.Imports, ptest.Internal.Imports, and ptest.Internal.RawImports
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// all line up (but RawImports can be shorter than the others).
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// That is, for 0 ≤ i < len(RawImports),
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// RawImports[i] is the import string in the program text,
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// Imports[i] is the expanded import string (vendoring applied or relative path expanded away),
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// and Internal.Imports[i] is the corresponding *Package.
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// Any implicitly added imports appear in Imports and Internal.Imports
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// but not RawImports (because they were not in the source code).
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// We insert TestImports, imports, and rawTestImports at the start of
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// these lists to preserve the alignment.
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ptest.Imports = str.StringList(p.TestImports, p.Imports)
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ptest.Internal.Imports = append(imports, p.Internal.Imports...)
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ptest.Internal.RawImports = str.StringList(rawTestImports, p.Internal.RawImports)
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ptest.Internal.ForceLibrary = true
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ptest.Internal.Build = new(build.Package)
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*ptest.Internal.Build = *p.Internal.Build
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m := map[string][]token.Position{}
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for k, v := range p.Internal.Build.ImportPos {
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m[k] = append(m[k], v...)
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}
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for k, v := range p.Internal.Build.TestImportPos {
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m[k] = append(m[k], v...)
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}
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ptest.Internal.Build.ImportPos = m
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} else {
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ptest = p
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}
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// External test package.
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if len(p.XTestGoFiles) > 0 {
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pxtest = &Package{
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PackagePublic: PackagePublic{
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Name: p.Name + "_test",
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ImportPath: p.ImportPath + "_test",
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Root: p.Root,
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Dir: p.Dir,
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GoFiles: p.XTestGoFiles,
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Imports: p.XTestImports,
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},
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Internal: PackageInternal{
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LocalPrefix: p.Internal.LocalPrefix,
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Build: &build.Package{
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ImportPos: p.Internal.Build.XTestImportPos,
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},
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Imports: ximports,
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RawImports: rawXTestImports,
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Asmflags: p.Internal.Asmflags,
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Gcflags: p.Internal.Gcflags,
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Ldflags: p.Internal.Ldflags,
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Gccgoflags: p.Internal.Gccgoflags,
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},
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}
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if pxtestNeedsPtest {
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pxtest.Internal.Imports = append(pxtest.Internal.Imports, ptest)
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}
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}
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if p != ptest && pxtest != nil {
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// We have made modifications to the package p being tested
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// and are rebuilding p (as ptest).
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// Arrange to rebuild all packages q such that
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// pxtest depends on q and q depends on p.
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// This makes sure that q sees the modifications to p.
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// Strictly speaking, the rebuild is only necessary if the
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// modifications to p change its export metadata, but
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// determining that is a bit tricky, so we rebuild always.
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recompileForTest(p, ptest, pxtest)
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}
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return ptest, pxtest, nil
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}
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func testImportStack(top string, p *Package, target string) []string {
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stk := []string{top, p.ImportPath}
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Search:
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for p.ImportPath != target {
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for _, p1 := range p.Internal.Imports {
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if p1.ImportPath == target || str.Contains(p1.Deps, target) {
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stk = append(stk, p1.ImportPath)
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p = p1
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continue Search
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}
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}
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// Can't happen, but in case it does...
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stk = append(stk, "<lost path to cycle>")
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break
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}
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return stk
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}
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func recompileForTest(preal, ptest, pxtest *Package) {
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// The "test copy" of preal is ptest.
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// For each package that depends on preal, make a "test copy"
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// that depends on ptest. And so on, up the dependency tree.
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testCopy := map[*Package]*Package{preal: ptest}
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// Only pxtest and its dependencies can legally depend on p.
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// If ptest or its dependencies depended on p, the dependency
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// would be circular.
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for _, p := range PackageList([]*Package{pxtest}) {
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if p == preal {
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continue
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}
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// Copy on write.
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didSplit := p == pxtest
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split := func() {
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if didSplit {
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return
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}
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didSplit = true
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if testCopy[p] != nil {
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panic("recompileForTest loop")
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}
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p1 := new(Package)
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testCopy[p] = p1
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*p1 = *p
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p1.Internal.Imports = make([]*Package, len(p.Internal.Imports))
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copy(p1.Internal.Imports, p.Internal.Imports)
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p = p1
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p.Target = ""
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}
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// Update p.Internal.Imports to use test copies.
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for i, imp := range p.Internal.Imports {
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if p1 := testCopy[imp]; p1 != nil && p1 != imp {
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split()
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p.Internal.Imports[i] = p1
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}
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}
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}
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}
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