AndroidMkEntries() returns multiple AndroidMkEntries structs

AndroidMkEntries now returns multiple AndroidMkEntires so that a module
can emit multiple Make modules if needed.

Bug: 128708192
Test: m

Change-Id: I56b6f76d22943b80329951c5acb80a1b932441ad
diff --git a/java/androidmk.go b/java/androidmk.go
index c973739..d94c9b8 100644
--- a/java/androidmk.go
+++ b/java/androidmk.go
@@ -22,8 +22,6 @@
 	"android/soong/android"
 )
 
-// TODO(jungjw): We'll probably want AndroidMkEntriesProvider.AndroidMkEntries to return multiple
-// entries so that this can be more error-proof.
 func (library *Library) AndroidMkHostDex(w io.Writer, name string, entries *android.AndroidMkEntries) {
 	if Bool(library.deviceProperties.Hostdex) && !library.Host() {
 		fmt.Fprintln(w, "include $(CLEAR_VARS)")
@@ -57,13 +55,13 @@
 	}
 }
 
-func (library *Library) AndroidMkEntries() android.AndroidMkEntries {
+func (library *Library) AndroidMkEntries() []android.AndroidMkEntries {
 	if !library.IsForPlatform() {
-		return android.AndroidMkEntries{
+		return []android.AndroidMkEntries{android.AndroidMkEntries{
 			Disabled: true,
-		}
+		}}
 	}
-	return android.AndroidMkEntries{
+	return []android.AndroidMkEntries{android.AndroidMkEntries{
 		Class:      "JAVA_LIBRARIES",
 		OutputFile: android.OptionalPathForPath(library.outputFile),
 		Include:    "$(BUILD_SYSTEM)/soong_java_prebuilt.mk",
@@ -111,7 +109,7 @@
 				library.AndroidMkHostDex(w, name, entries)
 			},
 		},
-	}
+	}}
 }
 
 // Called for modules that are a component of a test suite.
@@ -124,8 +122,9 @@
 	}
 }
 
-func (j *Test) AndroidMkEntries() android.AndroidMkEntries {
-	entries := j.Library.AndroidMkEntries()
+func (j *Test) AndroidMkEntries() []android.AndroidMkEntries {
+	entriesList := j.Library.AndroidMkEntries()
+	entries := &entriesList[0]
 	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
 		testSuiteComponent(entries, j.testProperties.Test_suites)
 		if j.testConfig != nil {
@@ -134,25 +133,26 @@
 		androidMkWriteTestData(j.data, entries)
 	})
 
-	return entries
+	return entriesList
 }
 
-func (j *TestHelperLibrary) AndroidMkEntries() android.AndroidMkEntries {
-	entries := j.Library.AndroidMkEntries()
+func (j *TestHelperLibrary) AndroidMkEntries() []android.AndroidMkEntries {
+	entriesList := j.Library.AndroidMkEntries()
+	entries := &entriesList[0]
 	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
 		testSuiteComponent(entries, j.testHelperLibraryProperties.Test_suites)
 	})
 
-	return entries
+	return entriesList
 }
 
-func (prebuilt *Import) AndroidMkEntries() android.AndroidMkEntries {
+func (prebuilt *Import) AndroidMkEntries() []android.AndroidMkEntries {
 	if !prebuilt.IsForPlatform() || !prebuilt.ContainingSdk().Unversioned() {
-		return android.AndroidMkEntries{
+		return []android.AndroidMkEntries{android.AndroidMkEntries{
 			Disabled: true,
-		}
+		}}
 	}
-	return android.AndroidMkEntries{
+	return []android.AndroidMkEntries{android.AndroidMkEntries{
 		Class:      "JAVA_LIBRARIES",
 		OutputFile: android.OptionalPathForPath(prebuilt.combinedClasspathFile),
 		Include:    "$(BUILD_SYSTEM)/soong_java_prebuilt.mk",
@@ -165,16 +165,16 @@
 				entries.SetString("LOCAL_MODULE_STEM", prebuilt.Stem())
 			},
 		},
-	}
+	}}
 }
 
-func (prebuilt *DexImport) AndroidMkEntries() android.AndroidMkEntries {
+func (prebuilt *DexImport) AndroidMkEntries() []android.AndroidMkEntries {
 	if !prebuilt.IsForPlatform() {
-		return android.AndroidMkEntries{
+		return []android.AndroidMkEntries{android.AndroidMkEntries{
 			Disabled: true,
-		}
+		}}
 	}
-	return android.AndroidMkEntries{
+	return []android.AndroidMkEntries{android.AndroidMkEntries{
 		Class:      "JAVA_LIBRARIES",
 		OutputFile: android.OptionalPathForPath(prebuilt.maybeStrippedDexJarFile),
 		Include:    "$(BUILD_SYSTEM)/soong_java_prebuilt.mk",
@@ -193,11 +193,11 @@
 				entries.SetString("LOCAL_MODULE_STEM", prebuilt.Stem())
 			},
 		},
-	}
+	}}
 }
 
-func (prebuilt *AARImport) AndroidMkEntries() android.AndroidMkEntries {
-	return android.AndroidMkEntries{
+func (prebuilt *AARImport) AndroidMkEntries() []android.AndroidMkEntries {
+	return []android.AndroidMkEntries{android.AndroidMkEntries{
 		Class:      "JAVA_LIBRARIES",
 		OutputFile: android.OptionalPathForPath(prebuilt.classpathFile),
 		Include:    "$(BUILD_SYSTEM)/soong_java_prebuilt.mk",
@@ -213,13 +213,13 @@
 				entries.SetString("LOCAL_SDK_VERSION", prebuilt.sdkVersion())
 			},
 		},
-	}
+	}}
 }
 
-func (binary *Binary) AndroidMkEntries() android.AndroidMkEntries {
+func (binary *Binary) AndroidMkEntries() []android.AndroidMkEntries {
 
 	if !binary.isWrapperVariant {
-		return android.AndroidMkEntries{
+		return []android.AndroidMkEntries{android.AndroidMkEntries{
 			Class:      "JAVA_LIBRARIES",
 			OutputFile: android.OptionalPathForPath(binary.outputFile),
 			Include:    "$(BUILD_SYSTEM)/soong_java_prebuilt.mk",
@@ -240,9 +240,9 @@
 					fmt.Fprintln(w, "jar_installed_module := $(LOCAL_INSTALLED_MODULE)")
 				},
 			},
-		}
+		}}
 	} else {
-		return android.AndroidMkEntries{
+		return []android.AndroidMkEntries{android.AndroidMkEntries{
 			Class:      "EXECUTABLES",
 			OutputFile: android.OptionalPathForPath(binary.wrapperFile),
 			ExtraEntries: []android.AndroidMkExtraEntriesFunc{
@@ -257,17 +257,17 @@
 					fmt.Fprintln(w, "jar_installed_module :=")
 				},
 			},
-		}
+		}}
 	}
 }
 
-func (app *AndroidApp) AndroidMkEntries() android.AndroidMkEntries {
+func (app *AndroidApp) AndroidMkEntries() []android.AndroidMkEntries {
 	if !app.IsForPlatform() {
-		return android.AndroidMkEntries{
+		return []android.AndroidMkEntries{android.AndroidMkEntries{
 			Disabled: true,
-		}
+		}}
 	}
-	return android.AndroidMkEntries{
+	return []android.AndroidMkEntries{android.AndroidMkEntries{
 		Class:      "APPS",
 		OutputFile: android.OptionalPathForPath(app.outputFile),
 		Include:    "$(BUILD_SYSTEM)/soong_app_prebuilt.mk",
@@ -359,7 +359,7 @@
 				}
 			},
 		},
-	}
+	}}
 }
 
 func (a *AndroidApp) getOverriddenPackages() []string {
@@ -373,8 +373,9 @@
 	return overridden
 }
 
-func (a *AndroidTest) AndroidMkEntries() android.AndroidMkEntries {
-	entries := a.AndroidApp.AndroidMkEntries()
+func (a *AndroidTest) AndroidMkEntries() []android.AndroidMkEntries {
+	entriesList := a.AndroidApp.AndroidMkEntries()
+	entries := &entriesList[0]
 	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
 		testSuiteComponent(entries, a.testProperties.Test_suites)
 		if a.testConfig != nil {
@@ -383,20 +384,22 @@
 		androidMkWriteTestData(a.data, entries)
 	})
 
-	return entries
+	return entriesList
 }
 
-func (a *AndroidTestHelperApp) AndroidMkEntries() android.AndroidMkEntries {
-	entries := a.AndroidApp.AndroidMkEntries()
+func (a *AndroidTestHelperApp) AndroidMkEntries() []android.AndroidMkEntries {
+	entriesList := a.AndroidApp.AndroidMkEntries()
+	entries := &entriesList[0]
 	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
 		testSuiteComponent(entries, a.appTestHelperAppProperties.Test_suites)
 	})
 
-	return entries
+	return entriesList
 }
 
-func (a *AndroidLibrary) AndroidMkEntries() android.AndroidMkEntries {
-	entries := a.Library.AndroidMkEntries()
+func (a *AndroidLibrary) AndroidMkEntries() []android.AndroidMkEntries {
+	entriesList := a.Library.AndroidMkEntries()
+	entries := &entriesList[0]
 
 	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
 		if a.aarFile != nil {
@@ -417,11 +420,11 @@
 		entries.SetBoolIfTrue("LOCAL_UNINSTALLABLE_MODULE", true)
 	})
 
-	return entries
+	return entriesList
 }
 
-func (jd *Javadoc) AndroidMkEntries() android.AndroidMkEntries {
-	return android.AndroidMkEntries{
+func (jd *Javadoc) AndroidMkEntries() []android.AndroidMkEntries {
+	return []android.AndroidMkEntries{android.AndroidMkEntries{
 		Class:      "JAVA_LIBRARIES",
 		OutputFile: android.OptionalPathForPath(jd.stubsSrcJar),
 		Include:    "$(BUILD_SYSTEM)/soong_droiddoc_prebuilt.mk",
@@ -435,11 +438,11 @@
 				}
 			},
 		},
-	}
+	}}
 }
 
-func (ddoc *Droiddoc) AndroidMkEntries() android.AndroidMkEntries {
-	return android.AndroidMkEntries{
+func (ddoc *Droiddoc) AndroidMkEntries() []android.AndroidMkEntries {
+	return []android.AndroidMkEntries{android.AndroidMkEntries{
 		Class:      "JAVA_LIBRARIES",
 		OutputFile: android.OptionalPathForPath(ddoc.stubsSrcJar),
 		Include:    "$(BUILD_SYSTEM)/soong_droiddoc_prebuilt.mk",
@@ -520,11 +523,11 @@
 				}
 			},
 		},
-	}
+	}}
 }
 
-func (dstubs *Droidstubs) AndroidMkEntries() android.AndroidMkEntries {
-	return android.AndroidMkEntries{
+func (dstubs *Droidstubs) AndroidMkEntries() []android.AndroidMkEntries {
+	return []android.AndroidMkEntries{android.AndroidMkEntries{
 		Class:      "JAVA_LIBRARIES",
 		OutputFile: android.OptionalPathForPath(dstubs.stubsSrcJar),
 		Include:    "$(BUILD_SYSTEM)/soong_droiddoc_prebuilt.mk",
@@ -636,11 +639,11 @@
 				}
 			},
 		},
-	}
+	}}
 }
 
-func (a *AndroidAppImport) AndroidMkEntries() android.AndroidMkEntries {
-	return android.AndroidMkEntries{
+func (a *AndroidAppImport) AndroidMkEntries() []android.AndroidMkEntries {
+	return []android.AndroidMkEntries{android.AndroidMkEntries{
 		Class:      "APPS",
 		OutputFile: android.OptionalPathForPath(a.outputFile),
 		Include:    "$(BUILD_SYSTEM)/soong_app_prebuilt.mk",
@@ -659,16 +662,17 @@
 				entries.AddStrings("LOCAL_INSTALLED_MODULE_STEM", a.installPath.Rel())
 			},
 		},
-	}
+	}}
 }
 
-func (a *AndroidTestImport) AndroidMkEntries() android.AndroidMkEntries {
-	entries := a.AndroidAppImport.AndroidMkEntries()
+func (a *AndroidTestImport) AndroidMkEntries() []android.AndroidMkEntries {
+	entriesList := a.AndroidAppImport.AndroidMkEntries()
+	entries := &entriesList[0]
 	entries.ExtraEntries = append(entries.ExtraEntries, func(entries *android.AndroidMkEntries) {
 		testSuiteComponent(entries, a.testProperties.Test_suites)
 		androidMkWriteTestData(a.data, entries)
 	})
-	return entries
+	return entriesList
 }
 
 func androidMkWriteTestData(data android.Paths, entries *android.AndroidMkEntries) {
diff --git a/java/androidmk_test.go b/java/androidmk_test.go
index 438b66a..9673576 100644
--- a/java/androidmk_test.go
+++ b/java/androidmk_test.go
@@ -31,7 +31,7 @@
 	`)
 
 	mod := ctx.ModuleForTests("foo", "android_common").Module()
-	entries := android.AndroidMkEntriesForTest(t, config, "", mod)
+	entries := android.AndroidMkEntriesForTest(t, config, "", mod)[0]
 
 	expected := []string{"libfoo"}
 	actual := entries.EntryMap["LOCAL_REQUIRED_MODULES"]
@@ -50,7 +50,7 @@
 	`)
 
 	mod := ctx.ModuleForTests("foo", "android_common").Module()
-	entries := android.AndroidMkEntriesForTest(t, config, "", mod)
+	entries := android.AndroidMkEntriesForTest(t, config, "", mod)[0]
 
 	expected := []string{"foo"}
 	actual := entries.EntryMap["LOCAL_MODULE"]
@@ -75,7 +75,7 @@
 	`)
 
 	mod := ctx.ModuleForTests("foo", "android_common").Module()
-	entries := android.AndroidMkEntriesForTest(t, config, "", mod)
+	entries := android.AndroidMkEntriesForTest(t, config, "", mod)[0]
 
 	expected := []string{"libfoo"}
 	actual := entries.EntryMap["LOCAL_REQUIRED_MODULES"]
@@ -104,7 +104,7 @@
 	`)
 
 	mod := ctx.ModuleForTests("foo", "android_common").Module()
-	entries := android.AndroidMkEntriesForTest(t, config, "", mod)
+	entries := android.AndroidMkEntriesForTest(t, config, "", mod)[0]
 
 	if r, ok := entries.EntryMap["LOCAL_REQUIRED_MODULES"]; ok {
 		t.Errorf("Unexpected required modules: %q", r)
diff --git a/java/app_test.go b/java/app_test.go
index c7ed49b..1800bb7 100644
--- a/java/app_test.go
+++ b/java/app_test.go
@@ -1529,7 +1529,7 @@
 		a := variant.Module().(*AndroidAppImport)
 		expectedValues := []string{test.expected}
 		actualValues := android.AndroidMkEntriesForTest(
-			t, config, "", a).EntryMap["LOCAL_INSTALLED_MODULE_STEM"]
+			t, config, "", a)[0].EntryMap["LOCAL_INSTALLED_MODULE_STEM"]
 		if !reflect.DeepEqual(actualValues, expectedValues) {
 			t.Errorf("Incorrect LOCAL_INSTALLED_MODULE_STEM value '%s', expected '%s'",
 				actualValues, expectedValues)
@@ -1615,7 +1615,7 @@
 	test := ctx.ModuleForTests("foo", "android_common").Module().(*AndroidTestImport)
 
 	// Check android mks.
-	entries := android.AndroidMkEntriesForTest(t, config, "", test)
+	entries := android.AndroidMkEntriesForTest(t, config, "", test)[0]
 	expected := []string{"tests"}
 	actual := entries.EntryMap["LOCAL_MODULE_TAGS"]
 	if !reflect.DeepEqual(expected, actual) {
diff --git a/java/platform_compat_config.go b/java/platform_compat_config.go
index 23ba2b0..7801634 100644
--- a/java/platform_compat_config.go
+++ b/java/platform_compat_config.go
@@ -71,8 +71,8 @@
 
 }
 
-func (p *platformCompatConfig) AndroidMkEntries() android.AndroidMkEntries {
-	return android.AndroidMkEntries{
+func (p *platformCompatConfig) AndroidMkEntries() []android.AndroidMkEntries {
+	return []android.AndroidMkEntries{android.AndroidMkEntries{
 		Class:      "ETC",
 		OutputFile: android.OptionalPathForPath(p.configFile),
 		Include:    "$(BUILD_PREBUILT)",
@@ -82,7 +82,7 @@
 				entries.SetString("LOCAL_INSTALLED_MODULE_STEM", p.configFile.Base())
 			},
 		},
-	}
+	}}
 }
 
 func platformCompatConfigFactory() android.Module {
diff --git a/java/robolectric.go b/java/robolectric.go
index b7646eb..3195615 100644
--- a/java/robolectric.go
+++ b/java/robolectric.go
@@ -158,8 +158,9 @@
 	TransformResourcesToJar(ctx, outputFile, srcJarArgs, srcJarDeps)
 }
 
-func (r *robolectricTest) AndroidMkEntries() android.AndroidMkEntries {
-	entries := r.Library.AndroidMkEntries()
+func (r *robolectricTest) AndroidMkEntries() []android.AndroidMkEntries {
+	entriesList := r.Library.AndroidMkEntries()
+	entries := &entriesList[0]
 
 	entries.ExtraFooters = []android.AndroidMkExtraFootersFunc{
 		func(w io.Writer, name, prefix, moduleDir string, entries *android.AndroidMkEntries) {
@@ -185,7 +186,7 @@
 		},
 	}
 
-	return entries
+	return entriesList
 }
 
 func (r *robolectricTest) writeTestRunner(w io.Writer, module, name string, tests []string) {
diff --git a/java/sdk_library.go b/java/sdk_library.go
index a7956fa..e204659 100644
--- a/java/sdk_library.go
+++ b/java/sdk_library.go
@@ -194,13 +194,13 @@
 	})
 }
 
-func (module *SdkLibrary) AndroidMkEntries() android.AndroidMkEntries {
-	entries := module.Library.AndroidMkEntries()
+func (module *SdkLibrary) AndroidMkEntries() []android.AndroidMkEntries {
+	entriesList := module.Library.AndroidMkEntries()
+	entries := &entriesList[0]
 	entries.Required = append(entries.Required, module.xmlFileName())
 
 	entries.ExtraFooters = []android.AndroidMkExtraFootersFunc{
 		func(w io.Writer, name, prefix, moduleDir string, entries *android.AndroidMkEntries) {
-			module.Library.AndroidMkHostDex(w, name, entries)
 			if !Bool(module.sdkLibraryProperties.No_dist) {
 				// Create a phony module that installs the impl library, for the case when this lib is
 				// in PRODUCT_PACKAGES.
@@ -252,7 +252,7 @@
 			}
 		},
 	}
-	return entries
+	return entriesList
 }
 
 // Module name of the stubs library