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379 lines
15 KiB
379 lines
15 KiB
// Copyright 2015 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package android
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import (
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"android/soong/bazel"
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"fmt"
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"path/filepath"
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"strings"
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"github.com/google/blueprint"
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"github.com/google/blueprint/pathtools"
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)
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// bazel_paths contains methods to:
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// * resolve Soong path and module references into bazel.LabelList
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// * resolve Bazel path references into Soong-compatible paths
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//
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// There is often a similar method for Bazel as there is for Soong path handling and should be used
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// in similar circumstances
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//
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// Bazel Soong
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//
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// BazelLabelForModuleSrc PathForModuleSrc
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// BazelLabelForModuleSrcExcludes PathForModuleSrcExcludes
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// BazelLabelForModuleDeps n/a
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// tbd PathForSource
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// tbd ExistentPathsForSources
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// PathForBazelOut PathForModuleOut
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//
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// Use cases:
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// * Module contains a property (often tagged `android:"path"`) that expects paths *relative to the
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// module directory*:
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// * BazelLabelForModuleSrcExcludes, if the module also contains an excludes_<propname> property
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// * BazelLabelForModuleSrc, otherwise
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// * Converting references to other modules to Bazel Labels:
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// BazelLabelForModuleDeps
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// * Converting a path obtained from bazel_handler cquery results:
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// PathForBazelOut
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//
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// NOTE: all Soong globs are expanded within Soong rather than being converted to a Bazel glob
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// syntax. This occurs because Soong does not have a concept of crossing package boundaries,
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// so the glob as computed by Soong may contain paths that cross package-boundaries. These
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// would be unknowingly omitted if the glob were handled by Bazel. By expanding globs within
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// Soong, we support identification and detection (within Bazel) use of paths that cross
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// package boundaries.
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//
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// Path resolution:
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// * filepath/globs: resolves as itself or is converted to an absolute Bazel label (e.g.
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// //path/to/dir:<filepath>) if path exists in a separate package or subpackage.
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// * references to other modules (using the ":name{.tag}" syntax). These resolve as a Bazel label
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// for a target. If the Bazel target is in the local module directory, it will be returned
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// relative to the current package (e.g. ":<target>"). Otherwise, it will be returned as an
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// absolute Bazel label (e.g. "//path/to/dir:<target>"). If the reference to another module
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// cannot be resolved,the function will panic. This is often due to the dependency not being added
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// via an AddDependency* method.
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// A subset of the ModuleContext methods which are sufficient to resolve references to paths/deps in
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// order to form a Bazel-compatible label for conversion.
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type BazelConversionPathContext interface {
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EarlyModulePathContext
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GetDirectDep(name string) (blueprint.Module, blueprint.DependencyTag)
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Module() Module
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ModuleType() string
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OtherModuleName(m blueprint.Module) string
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OtherModuleDir(m blueprint.Module) string
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}
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// BazelLabelForModuleDeps expects a list of reference to other modules, ("<module>"
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// or ":<module>") and returns a Bazel-compatible label which corresponds to dependencies on the
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// module within the given ctx.
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func BazelLabelForModuleDeps(ctx BazelConversionPathContext, modules []string) bazel.LabelList {
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var labels bazel.LabelList
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for _, module := range modules {
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bpText := module
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if m := SrcIsModule(module); m == "" {
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module = ":" + module
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}
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if m, t := SrcIsModuleWithTag(module); m != "" {
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l := getOtherModuleLabel(ctx, m, t)
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l.OriginalModuleName = bpText
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labels.Includes = append(labels.Includes, l)
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} else {
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ctx.ModuleErrorf("%q, is not a module reference", module)
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}
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}
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return labels
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}
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func BazelLabelForModuleSrcSingle(ctx BazelConversionPathContext, path string) bazel.Label {
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return BazelLabelForModuleSrcExcludes(ctx, []string{path}, []string(nil)).Includes[0]
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}
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// BazelLabelForModuleSrc expects a list of path (relative to local module directory) and module
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// references (":<module>") and returns a bazel.LabelList{} containing the resolved references in
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// paths, relative to the local module, or Bazel-labels (absolute if in a different package or
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// relative if within the same package).
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// Properties must have been annotated with struct tag `android:"path"` so that dependencies modules
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// will have already been handled by the path_deps mutator.
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func BazelLabelForModuleSrc(ctx BazelConversionPathContext, paths []string) bazel.LabelList {
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return BazelLabelForModuleSrcExcludes(ctx, paths, []string(nil))
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}
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// BazelLabelForModuleSrc expects lists of path and excludes (relative to local module directory)
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// and module references (":<module>") and returns a bazel.LabelList{} containing the resolved
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// references in paths, minus those in excludes, relative to the local module, or Bazel-labels
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// (absolute if in a different package or relative if within the same package).
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// Properties must have been annotated with struct tag `android:"path"` so that dependencies modules
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// will have already been handled by the path_deps mutator.
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func BazelLabelForModuleSrcExcludes(ctx BazelConversionPathContext, paths, excludes []string) bazel.LabelList {
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excludeLabels := expandSrcsForBazel(ctx, excludes, []string(nil))
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excluded := make([]string, 0, len(excludeLabels.Includes))
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for _, e := range excludeLabels.Includes {
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excluded = append(excluded, e.Label)
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}
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labels := expandSrcsForBazel(ctx, paths, excluded)
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labels.Excludes = excludeLabels.Includes
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labels = transformSubpackagePaths(ctx, labels)
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return labels
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}
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// Returns true if a prefix + components[:i] + /Android.bp exists
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// TODO(b/185358476) Could check for BUILD file instead of checking for Android.bp file, or ensure BUILD is always generated?
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func directoryHasBlueprint(fs pathtools.FileSystem, prefix string, components []string, componentIndex int) bool {
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blueprintPath := prefix
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if blueprintPath != "" {
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blueprintPath = blueprintPath + "/"
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}
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blueprintPath = blueprintPath + strings.Join(components[:componentIndex+1], "/")
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blueprintPath = blueprintPath + "/Android.bp"
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if exists, _, _ := fs.Exists(blueprintPath); exists {
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return true
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} else {
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return false
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}
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}
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// Transform a path (if necessary) to acknowledge package boundaries
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//
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// e.g. something like
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// async_safe/include/async_safe/CHECK.h
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// might become
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// //bionic/libc/async_safe:include/async_safe/CHECK.h
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// if the "async_safe" directory is actually a package and not just a directory.
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//
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// In particular, paths that extend into packages are transformed into absolute labels beginning with //.
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func transformSubpackagePath(ctx BazelConversionPathContext, path bazel.Label) bazel.Label {
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var newPath bazel.Label
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// Don't transform OriginalModuleName
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newPath.OriginalModuleName = path.OriginalModuleName
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if strings.HasPrefix(path.Label, "//") {
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// Assume absolute labels are already correct (e.g. //path/to/some/package:foo.h)
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newPath.Label = path.Label
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return newPath
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}
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newLabel := ""
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pathComponents := strings.Split(path.Label, "/")
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foundBlueprint := false
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// Check the deepest subdirectory first and work upwards
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for i := len(pathComponents) - 1; i >= 0; i-- {
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pathComponent := pathComponents[i]
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var sep string
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if !foundBlueprint && directoryHasBlueprint(ctx.Config().fs, ctx.ModuleDir(), pathComponents, i) {
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sep = ":"
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foundBlueprint = true
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} else {
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sep = "/"
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}
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if newLabel == "" {
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newLabel = pathComponent
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} else {
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newLabel = pathComponent + sep + newLabel
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}
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}
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if foundBlueprint {
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// Ensure paths end up looking like //bionic/... instead of //./bionic/...
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moduleDir := ctx.ModuleDir()
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if strings.HasPrefix(moduleDir, ".") {
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moduleDir = moduleDir[1:]
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}
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// Make the path into an absolute label (e.g. //bionic/libc/foo:bar.h instead of just foo:bar.h)
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if moduleDir == "" {
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newLabel = "//" + newLabel
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} else {
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newLabel = "//" + moduleDir + "/" + newLabel
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}
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}
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newPath.Label = newLabel
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return newPath
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}
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// Transform paths to acknowledge package boundaries
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// See transformSubpackagePath() for more information
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func transformSubpackagePaths(ctx BazelConversionPathContext, paths bazel.LabelList) bazel.LabelList {
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var newPaths bazel.LabelList
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for _, include := range paths.Includes {
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newPaths.Includes = append(newPaths.Includes, transformSubpackagePath(ctx, include))
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}
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for _, exclude := range paths.Excludes {
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newPaths.Excludes = append(newPaths.Excludes, transformSubpackagePath(ctx, exclude))
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}
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return newPaths
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}
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// expandSrcsForBazel returns bazel.LabelList with paths rooted from the module's local source
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// directory and Bazel target labels, excluding those included in the excludes argument (which
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// should already be expanded to resolve references to Soong-modules). Valid elements of paths
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// include:
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// * filepath, relative to local module directory, resolves as a filepath relative to the local
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// source directory
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// * glob, relative to the local module directory, resolves as filepath(s), relative to the local
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// module directory. Because Soong does not have a concept of crossing package boundaries, the
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// glob as computed by Soong may contain paths that cross package-boundaries that would be
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// unknowingly omitted if the glob were handled by Bazel. To allow identification and detect
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// (within Bazel) use of paths that cross package boundaries, we expand globs within Soong rather
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// than converting Soong glob syntax to Bazel glob syntax. **Invalid for excludes.**
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// * other modules using the ":name{.tag}" syntax. These modules must implement SourceFileProducer
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// or OutputFileProducer. These resolve as a Bazel label for a target. If the Bazel target is in
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// the local module directory, it will be returned relative to the current package (e.g.
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// ":<target>"). Otherwise, it will be returned as an absolute Bazel label (e.g.
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// "//path/to/dir:<target>"). If the reference to another module cannot be resolved,the function
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// will panic.
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// Properties passed as the paths or excludes argument must have been annotated with struct tag
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// `android:"path"` so that dependencies on other modules will have already been handled by the
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// path_deps mutator.
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func expandSrcsForBazel(ctx BazelConversionPathContext, paths, expandedExcludes []string) bazel.LabelList {
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if paths == nil {
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return bazel.LabelList{}
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}
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labels := bazel.LabelList{
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Includes: []bazel.Label{},
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}
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// expandedExcludes contain module-dir relative paths, but root-relative paths
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// are needed for GlobFiles later.
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var rootRelativeExpandedExcludes []string
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for _, e := range expandedExcludes {
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rootRelativeExpandedExcludes = append(rootRelativeExpandedExcludes, filepath.Join(ctx.ModuleDir(), e))
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}
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for _, p := range paths {
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if m, tag := SrcIsModuleWithTag(p); m != "" {
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l := getOtherModuleLabel(ctx, m, tag)
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if !InList(l.Label, expandedExcludes) {
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l.OriginalModuleName = fmt.Sprintf(":%s", m)
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labels.Includes = append(labels.Includes, l)
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}
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} else {
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var expandedPaths []bazel.Label
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if pathtools.IsGlob(p) {
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// e.g. turn "math/*.c" in
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// external/arm-optimized-routines to external/arm-optimized-routines/math/*.c
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rootRelativeGlobPath := pathForModuleSrc(ctx, p).String()
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globbedPaths := GlobFiles(ctx, rootRelativeGlobPath, rootRelativeExpandedExcludes)
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globbedPaths = PathsWithModuleSrcSubDir(ctx, globbedPaths, "")
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for _, path := range globbedPaths {
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s := path.Rel()
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expandedPaths = append(expandedPaths, bazel.Label{Label: s})
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}
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} else {
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if !InList(p, expandedExcludes) {
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expandedPaths = append(expandedPaths, bazel.Label{Label: p})
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}
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}
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labels.Includes = append(labels.Includes, expandedPaths...)
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}
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}
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return labels
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}
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// getOtherModuleLabel returns a bazel.Label for the given dependency/tag combination for the
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// module. The label will be relative to the current directory if appropriate. The dependency must
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// already be resolved by either deps mutator or path deps mutator.
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func getOtherModuleLabel(ctx BazelConversionPathContext, dep, tag string) bazel.Label {
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m, _ := ctx.GetDirectDep(dep)
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if m == nil {
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panic(fmt.Errorf(`Cannot get direct dep %q of %q.
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This is likely because it was not added via AddDependency().
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This may be due a mutator skipped during bp2build.`, dep, ctx.Module().Name()))
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}
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otherLabel := bazelModuleLabel(ctx, m, tag)
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label := bazelModuleLabel(ctx, ctx.Module(), "")
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if samePackage(label, otherLabel) {
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otherLabel = bazelShortLabel(otherLabel)
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}
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return bazel.Label{
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Label: otherLabel,
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}
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}
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func bazelModuleLabel(ctx BazelConversionPathContext, module blueprint.Module, tag string) string {
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// TODO(b/165114590): Convert tag (":name{.tag}") to corresponding Bazel implicit output targets.
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b, ok := module.(Bazelable)
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// TODO(b/181155349): perhaps return an error here if the module can't be/isn't being converted
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if !ok || !b.ConvertedToBazel(ctx) {
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return bp2buildModuleLabel(ctx, module)
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}
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return b.GetBazelLabel(ctx, module)
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}
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func bazelShortLabel(label string) string {
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i := strings.Index(label, ":")
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return label[i:]
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}
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func bazelPackage(label string) string {
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i := strings.Index(label, ":")
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return label[0:i]
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}
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func samePackage(label1, label2 string) bool {
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return bazelPackage(label1) == bazelPackage(label2)
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}
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func bp2buildModuleLabel(ctx BazelConversionPathContext, module blueprint.Module) string {
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moduleName := ctx.OtherModuleName(module)
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moduleDir := ctx.OtherModuleDir(module)
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return fmt.Sprintf("//%s:%s", moduleDir, moduleName)
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}
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// BazelOutPath is a Bazel output path compatible to be used for mixed builds within Soong/Ninja.
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type BazelOutPath struct {
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OutputPath
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}
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var _ Path = BazelOutPath{}
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var _ objPathProvider = BazelOutPath{}
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func (p BazelOutPath) objPathWithExt(ctx ModuleOutPathContext, subdir, ext string) ModuleObjPath {
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return PathForModuleObj(ctx, subdir, pathtools.ReplaceExtension(p.path, ext))
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}
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// PathForBazelOut returns a Path representing the paths... under an output directory dedicated to
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// bazel-owned outputs.
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func PathForBazelOut(ctx PathContext, paths ...string) BazelOutPath {
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execRootPathComponents := append([]string{"execroot", "__main__"}, paths...)
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execRootPath := filepath.Join(execRootPathComponents...)
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validatedExecRootPath, err := validatePath(execRootPath)
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if err != nil {
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reportPathError(ctx, err)
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}
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outputPath := OutputPath{basePath{"", ""},
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ctx.Config().buildDir,
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ctx.Config().BazelContext.OutputBase()}
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return BazelOutPath{
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OutputPath: outputPath.withRel(validatedExecRootPath),
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}
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}
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// PathsForBazelOut returns a list of paths representing the paths under an output directory
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// dedicated to Bazel-owned outputs.
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func PathsForBazelOut(ctx PathContext, paths []string) Paths {
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outs := make(Paths, 0, len(paths))
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for _, p := range paths {
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outs = append(outs, PathForBazelOut(ctx, p))
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}
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return outs
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}
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