Add cc_library_headers support to bp2build.

Test: Added cc_conversion_test.go.
Change-Id: Id4459d2c2fa02687a374cd9fb25d687e9678218c

2 files changed, 223 insertions, 0 deletions

diff --git a/bp2build/Android.bp b/bp2build/Android.bp
index fdac88dfd..5321d2a43 100644
--- a/bp2build/Android.bp
+++ b/bp2build/Android.bp
@@ -15,12 +15,14 @@ bootstrap_go_package {
     deps: [
         "soong-android",
         "soong-bazel",
+        "soong-cc",
         "soong-genrule",
         "soong-sh",
     ],
     testSrcs: [
         "build_conversion_test.go",
         "bzl_conversion_test.go",
+        "cc_conversion_test.go",
         "conversion_test.go",
         "testing.go",
     ],
diff --git a/bp2build/cc_conversion_test.go b/bp2build/cc_conversion_test.go
new file mode 100644
index 000000000..3cd37628f
--- /dev/null
+++ b/bp2build/cc_conversion_test.go
@@ -0,0 +1,221 @@
+// Copyright 2021 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 bp2build
+
+import (
+	"android/soong/android"
+	"android/soong/cc"
+	"strings"
+	"testing"
+)
+
+const (
+	// See cc/testing.go for more context
+	soongCcLibraryPreamble = `
+cc_defaults {
+	name: "linux_bionic_supported",
+}
+
+toolchain_library {
+	name: "libclang_rt.builtins-x86_64-android",
+	defaults: ["linux_bionic_supported"],
+	vendor_available: true,
+	vendor_ramdisk_available: true,
+	product_available: true,
+	recovery_available: true,
+	native_bridge_supported: true,
+	src: "",
+}
+
+toolchain_library {
+	name: "libatomic",
+	defaults: ["linux_bionic_supported"],
+	vendor_available: true,
+	vendor_ramdisk_available: true,
+	product_available: true,
+	recovery_available: true,
+	native_bridge_supported: true,
+	src: "",
+}`
+)
+
+func TestCcLibraryHeadersLoadStatement(t *testing.T) {
+	testCases := []struct {
+		bazelTargets           BazelTargets
+		expectedLoadStatements string
+	}{
+		{
+			bazelTargets: BazelTargets{
+				BazelTarget{
+					name:      "cc_library_headers_target",
+					ruleClass: "cc_library_headers",
+					// Note: no bzlLoadLocation for native rules
+				},
+			},
+			expectedLoadStatements: ``,
+		},
+	}
+
+	for _, testCase := range testCases {
+		actual := testCase.bazelTargets.LoadStatements()
+		expected := testCase.expectedLoadStatements
+		if actual != expected {
+			t.Fatalf("Expected load statements to be %s, got %s", expected, actual)
+		}
+	}
+
+}
+
+func TestCcLibraryHeadersBp2Build(t *testing.T) {
+	testCases := []struct {
+		description                        string
+		moduleTypeUnderTest                string
+		moduleTypeUnderTestFactory         android.ModuleFactory
+		moduleTypeUnderTestBp2BuildMutator func(android.TopDownMutatorContext)
+		preArchMutators                    []android.RegisterMutatorFunc
+		depsMutators                       []android.RegisterMutatorFunc
+		bp                                 string
+		expectedBazelTargets               []string
+		filesystem                         map[string]string
+		dir                                string
+	}{
+		{
+			description:                        "cc_library_headers test",
+			moduleTypeUnderTest:                "cc_library_headers",
+			moduleTypeUnderTestFactory:         cc.LibraryHeaderFactory,
+			moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryHeadersBp2Build,
+			filesystem: map[string]string{
+				"lib-1/lib1a.h": "",
+				"lib-1/lib1b.h": "",
+				"lib-2/lib2a.h": "",
+				"lib-2/lib2b.h": "",
+				"dir-1/dir1a.h": "",
+				"dir-1/dir1b.h": "",
+				"dir-2/dir2a.h": "",
+				"dir-2/dir2b.h": "",
+			},
+			bp: soongCcLibraryPreamble + `
+cc_library_headers {
+    name: "lib-1",
+    export_include_dirs: ["lib-1"],
+    bazel_module: { bp2build_available: true },
+}
+
+cc_library_headers {
+    name: "lib-2",
+    export_include_dirs: ["lib-2"],
+    bazel_module: { bp2build_available: true },
+}
+
+cc_library_headers {
+    name: "foo_headers",
+    export_include_dirs: ["dir-1", "dir-2"],
+    header_libs: ["lib-1", "lib-2"],
+    export_header_lib_headers: ["lib-1", "lib-2"],
+    bazel_module: { bp2build_available: true },
+}`,
+			expectedBazelTargets: []string{`cc_library_headers(
+    name = "foo_headers",
+    deps = [
+        ":lib-1",
+        ":lib-2",
+    ],
+    hdrs = [
+        "dir-1/dir1a.h",
+        "dir-1/dir1b.h",
+        "dir-2/dir2a.h",
+        "dir-2/dir2b.h",
+    ],
+    includes = [
+        "dir-1",
+        "dir-2",
+    ],
+)`, `cc_library_headers(
+    name = "lib-1",
+    hdrs = [
+        "lib-1/lib1a.h",
+        "lib-1/lib1b.h",
+    ],
+    includes = [
+        "lib-1",
+    ],
+)`, `cc_library_headers(
+    name = "lib-2",
+    hdrs = [
+        "lib-2/lib2a.h",
+        "lib-2/lib2b.h",
+    ],
+    includes = [
+        "lib-2",
+    ],
+)`},
+		},
+	}
+
+	dir := "."
+	for _, testCase := range testCases {
+		filesystem := make(map[string][]byte)
+		toParse := []string{
+			"Android.bp",
+		}
+		for f, content := range testCase.filesystem {
+			if strings.HasSuffix(f, "Android.bp") {
+				toParse = append(toParse, f)
+			}
+			filesystem[f] = []byte(content)
+		}
+		config := android.TestConfig(buildDir, nil, testCase.bp, filesystem)
+		ctx := android.NewTestContext(config)
+
+		cc.RegisterCCBuildComponents(ctx)
+		ctx.RegisterModuleType("toolchain_library", cc.ToolchainLibraryFactory)
+
+		ctx.RegisterModuleType(testCase.moduleTypeUnderTest, testCase.moduleTypeUnderTestFactory)
+		for _, m := range testCase.depsMutators {
+			ctx.DepsBp2BuildMutators(m)
+		}
+		ctx.RegisterBp2BuildMutator(testCase.moduleTypeUnderTest, testCase.moduleTypeUnderTestBp2BuildMutator)
+		ctx.RegisterForBazelConversion()
+
+		_, errs := ctx.ParseFileList(dir, toParse)
+		if Errored(t, testCase.description, errs) {
+			continue
+		}
+		_, errs = ctx.ResolveDependencies(config)
+		if Errored(t, testCase.description, errs) {
+			continue
+		}
+
+		checkDir := dir
+		if testCase.dir != "" {
+			checkDir = testCase.dir
+		}
+		bazelTargets := GenerateBazelTargets(ctx.Context.Context, Bp2Build)[checkDir]
+		if actualCount, expectedCount := len(bazelTargets), len(testCase.expectedBazelTargets); actualCount != expectedCount {
+			t.Errorf("%s: Expected %d bazel target, got %d", testCase.description, expectedCount, actualCount)
+		} else {
+			for i, target := range bazelTargets {
+				if w, g := testCase.expectedBazelTargets[i], target.content; w != g {
+					t.Errorf(
+						"%s: Expected generated Bazel target to be '%s', got '%s'",
+						testCase.description,
+						w,
+						g,
+					)
+				}
+			}
+		}
+	}
+}