5ba7e479d1
The Bazel overlay is a directory at out/soong/bazel_overlay that replicates the layout of the AOSP Soong module tree, but as a Bazel workspace. Each Soong module variant is represented as a BUILD target created with the `soong_module` rule. To create this overlay, run `m bazel_overlay`. A `soong_module` target can depend on other `soong_module` targets. These dependencies replicate each module's `directDeps` in the Blueprint graph, just before `PrepareBuildActions`. This enables users to use bazel query as a way to introspect the Soong module graph. For example, - Direct reverse dependencies of //bionic/libc:generated_android_ids in //bionic/libc/...: $ bazel query 'rdeps(//bionic/libc/..., //bionic/libc:generated_android_ids, 1)' //bionic/libc:libc_bionic_ndk--android_recovery_arm_armv7-a-neon_static //bionic/libc:libc_bionic_ndk--android_ramdisk_arm_armv7-a-neon_static //bionic/libc:libc_bionic_ndk--android_arm_armv7-a-neon_static_com.android.runtime //bionic/libc:libc_bionic_ndk--android_arm_armv7-a-neon_static //bionic/libc:generated_android_ids - Why does com.android.runtime depend on lzma? $ bazel query 'somepath(//bionic/apex:com.android.runtime--android_common_com.android.runtime_image, //external/lzma/...)' //bionic/apex:com.android.runtime--android_common_com.android.runtime_image //bionic/libc/malloc_debug:libc_malloc_debug--android_arm_armv7-a-neon_shared_com.android.runtime //system/core/libunwindstack:libunwindstack--android_arm_armv7-a-neon_shared_com.android.runtime //external/lzma/C:liblzma--android_arm_armv7-a-neon_shared_com.android.runtime - What does the dep graph of //bionic/libc:crtbegin_so look like? $ bazel query 'deps(//bionic/libc:crtbegin_so--android_arm_armv7-a-neon)' --output=graph > graph.in && dot -Tpng < graph.in > graph.png https://photos.app.goo.gl/DfsdoFRNsRjGwTmy8 Test: croot && m bazel_overlay && cd out/soong/bazel_overlay && bazel query //... && bazel query 'rdeps(//bionic/libc/..., //bionic/libc:generated_android_ids, 1)' Signed-off-by: Jingwen Chen <jingwen@google.com> Change-Id: I3bf40309bfb2d963bb8a688706385a57ee304c37#
76 lines
2.5 KiB
Go
76 lines
2.5 KiB
Go
// Copyright 2020 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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"fmt"
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"os"
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"strings"
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"github.com/google/blueprint"
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)
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// The Bazel Overlay singleton is responsible for generating the Ninja actions
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// for calling the soong_build primary builder in the main build.ninja file.
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func init() {
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RegisterSingletonType("bazel_overlay", BazelOverlaySingleton)
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}
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func BazelOverlaySingleton() Singleton {
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return &bazelOverlaySingleton{}
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}
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type bazelOverlaySingleton struct{}
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func (c *bazelOverlaySingleton) GenerateBuildActions(ctx SingletonContext) {
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// Create a build and rule statement, using the Bazel overlay's WORKSPACE
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// file as the output file marker.
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var deps Paths
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moduleListFilePath := pathForBuildToolDep(ctx, ctx.Config().moduleListFile)
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deps = append(deps, moduleListFilePath)
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deps = append(deps, pathForBuildToolDep(ctx, ctx.Config().ProductVariablesFileName))
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bazelOverlayDirectory := PathForOutput(ctx, "bazel_overlay")
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bazelOverlayWorkspaceFile := bazelOverlayDirectory.Join(ctx, "WORKSPACE")
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primaryBuilder := primaryBuilderPath(ctx)
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bazelOverlay := ctx.Rule(pctx, "bazelOverlay",
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blueprint.RuleParams{
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Command: fmt.Sprintf(
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"rm -rf ${outDir}/* && %s --bazel_overlay_dir ${outDir} %s && echo WORKSPACE: `cat %s` > ${outDir}/.overlay-depfile.d",
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primaryBuilder.String(),
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strings.Join(os.Args[1:], " "),
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moduleListFilePath.String(), // Use the contents of Android.bp.list as the depfile.
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),
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CommandDeps: []string{primaryBuilder.String()},
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Description: fmt.Sprintf(
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"Creating the Bazel overlay workspace with %s at $outDir",
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primaryBuilder.Base()),
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Deps: blueprint.DepsGCC,
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Depfile: "${outDir}/.overlay-depfile.d",
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},
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"outDir")
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ctx.Build(pctx, BuildParams{
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Rule: bazelOverlay,
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Output: bazelOverlayWorkspaceFile,
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Inputs: deps,
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Args: map[string]string{
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"outDir": bazelOverlayDirectory.String(),
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},
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})
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// Add a phony target for building the bazel overlay
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ctx.Phony("bazel_overlay", bazelOverlayWorkspaceFile)
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}
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