1 files changed, 112 insertions, 0 deletions
diff --git a/android/queryview.go b/android/queryview.go
new file mode 100644
index 000000000..224652eba
--- /dev/null
+++ b/android/queryview.go
@@ -0,0 +1,112 @@
+// Copyright 2020 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package android
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/google/blueprint"
+)
+
+// The Bazel QueryView singleton is responsible for generating the Ninja actions
+// for calling the soong_build primary builder in the main build.ninja file.
+func init() {
+	RegisterSingletonType("bazel_queryview", BazelQueryViewSingleton)
+}
+
+// BazelQueryViewSingleton is the singleton responsible for registering the
+// soong_build build statement that will convert the Soong module graph after
+// applying *all* mutators, enabing the feature to query the final state of the
+// Soong graph. This mode is meant for querying the build graph state, and not meant
+// for generating BUILD files to be checked in.
+func BazelQueryViewSingleton() Singleton {
+	return &bazelQueryViewSingleton{}
+}
+
+// BazelConverterSingleton is the singleton responsible for registering the soong_build
+// build statement that will convert the Soong module graph by applying an alternate
+// pipeline of mutators, with the goal of reaching semantic equivalence between the original
+// Blueprint and final BUILD files. Using this mode, the goal is to be able to
+// build with these BUILD files directly in the source tree.
+func BazelConverterSingleton() Singleton {
+	return &bazelConverterSingleton{}
+}
+
+type bazelQueryViewSingleton struct{}
+type bazelConverterSingleton struct{}
+
+func generateBuildActionsForBazelConversion(ctx SingletonContext, converterMode bool) {
+	name := "queryview"
+	descriptionTemplate := "[EXPERIMENTAL, PRE-PRODUCTION] Creating the Bazel QueryView workspace with %s at $outDir"
+
+	// Create a build and rule statement, using the Bazel QueryView's WORKSPACE
+	// file as the output file marker.
+	var deps Paths
+	moduleListFilePath := pathForBuildToolDep(ctx, ctx.Config().moduleListFile)
+	deps = append(deps, moduleListFilePath)
+	deps = append(deps, pathForBuildToolDep(ctx, ctx.Config().ProductVariablesFileName))
+
+	bazelQueryViewDirectory := PathForOutput(ctx, name)
+	bazelQueryViewWorkspaceFile := bazelQueryViewDirectory.Join(ctx, "WORKSPACE")
+	primaryBuilder := primaryBuilderPath(ctx)
+	bazelQueryView := ctx.Rule(pctx, "bazelQueryView",
+		blueprint.RuleParams{
+			Command: fmt.Sprintf(
+				`rm -rf "${outDir}/"* && `+
+					`mkdir -p "${outDir}" && `+
+					`echo WORKSPACE: $$(cat "%s") > "${outDir}/.queryview-depfile.d" && `+
+					`BUILDER="%s" && `+
+					`echo BUILDER=$$BUILDER && `+
+					`cd "$$(dirname "$$BUILDER")" && `+
+					`echo PWD=$$PWD && `+
+					`ABSBUILDER="$$PWD/$$(basename "$$BUILDER")" && `+
+					`echo ABSBUILDER=$$ABSBUILDER && `+
+					`cd / && `+
+					`env -i "$$ABSBUILDER" --bazel_queryview_dir "${outDir}" "%s"`,
+				moduleListFilePath.String(), // Use the contents of Android.bp.list as the depfile.
+				primaryBuilder.String(),
+				strings.Join(os.Args[1:], "\" \""),
+			),
+			CommandDeps: []string{primaryBuilder.String()},
+			Description: fmt.Sprintf(
+				descriptionTemplate,
+				primaryBuilder.Base()),
+			Deps:    blueprint.DepsGCC,
+			Depfile: "${outDir}/.queryview-depfile.d",
+		},
+		"outDir")
+
+	ctx.Build(pctx, BuildParams{
+		Rule:   bazelQueryView,
+		Output: bazelQueryViewWorkspaceFile,
+		Inputs: deps,
+		Args: map[string]string{
+			"outDir": bazelQueryViewDirectory.String(),
+		},
+	})
+
+	// Add a phony target for generating the workspace
+	ctx.Phony(name, bazelQueryViewWorkspaceFile)
+}
+
+func (c *bazelQueryViewSingleton) GenerateBuildActions(ctx SingletonContext) {
+	generateBuildActionsForBazelConversion(ctx, false)
+}
+
+func (c *bazelConverterSingleton) GenerateBuildActions(ctx SingletonContext) {
+	generateBuildActionsForBazelConversion(ctx, true)
+}