<apex_name>-deps-info correctly tracks dependencies

The APEX dependency is more correctly tracked. Previously, the
dependency was tracked while we gather modules that will be installed to
an APEX. This actually was incorrect because we skipped many dependency
types that we don't need to follow to gather the modules list, such as
the headers dependency.

Now, the dependency is tracked directly when a module is mutated for an
APEX. In other words, if a module is mutated for an apex X, then the
module will appear in the X-deps-into.txt file.

This change also changes the format of the txt file. It now clearly
shows why a module is included in the APEX by showing the list of
modules that depend on the module.

Bug: 146323213
Test: m
Change-Id: I0a70cf9cce56e36565f9d55683fdaace8748a081

apex/apex.go

@@ -1466,6 +1466,12 @@ func (af *apexFile) AvailableToPlatform() bool {
 	return false
 }
 
+type depInfo struct {
+	to         string
+	from       []string
+	isExternal bool
+}
+
 type apexBundle struct {
 	android.ModuleBase
 	android.DefaultableModuleBase
@@ -1499,10 +1505,8 @@ type apexBundle struct {
 	// list of module names that should be installed along with this APEX
 	requiredDeps []string
 
-	// list of module names that this APEX is depending on (to be shown via *-deps-info target)
-	externalDeps []string
 	// list of module names that this APEX is including (to be shown via *-deps-info target)
-	internalDeps []string
+	depInfos map[string]depInfo
 
 	testApex        bool
 	vndkApex        bool
@@ -1983,6 +1987,31 @@ func (a *apexBundle) checkApexAvailability(ctx android.ModuleContext) {
 	})
 }
 
+// Collects the list of module names that directly or indirectly contributes to the payload of this APEX
+func (a *apexBundle) collectDepsInfo(ctx android.ModuleContext) {
+	a.depInfos = make(map[string]depInfo)
+	a.walkPayloadDeps(ctx, func(ctx android.ModuleContext, from blueprint.Module, to android.ApexModule, externalDep bool) {
+		if from.Name() == to.Name() {
+			// This can happen for cc.reuseObjTag. We are not interested in tracking this.
+			return
+		}
+
+		if info, exists := a.depInfos[to.Name()]; exists {
+			if !android.InList(from.Name(), info.from) {
+				info.from = append(info.from, from.Name())
+			}
+			info.isExternal = info.isExternal && externalDep
+			a.depInfos[to.Name()] = info
+		} else {
+			a.depInfos[to.Name()] = depInfo{
+				to:         to.Name(),
+				from:       []string{from.Name()},
+				isExternal: externalDep,
+			}
+		}
+	})
+}
+
 func (a *apexBundle) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	buildFlattenedAsDefault := ctx.Config().FlattenApex() && !ctx.Config().UnbundledBuild()
 	switch a.properties.ApexType {
@@ -2020,6 +2049,8 @@ func (a *apexBundle) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 
 	a.checkApexAvailability(ctx)
 
+	a.collectDepsInfo(ctx)
+
 	handleSpecialLibs := !android.Bool(a.properties.Ignore_system_library_special_case)
 
 	// native lib dependencies
@@ -2051,13 +2082,11 @@ func (a *apexBundle) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	})
 
 	var filesInfo []apexFile
+	// TODO(jiyong) do this using walkPayloadDeps
 	ctx.WalkDepsBlueprint(func(child, parent blueprint.Module) bool {
 		depTag := ctx.OtherModuleDependencyTag(child)
 		depName := ctx.OtherModuleName(child)
 		if _, isDirectDep := parent.(*apexBundle); isDirectDep {
-			if depTag != keyTag && depTag != certificateTag {
-				a.internalDeps = append(a.internalDeps, depName)
-			}
 			switch depTag {
 			case sharedLibTag:
 				if c, ok := child.(*cc.Module); ok {
@@ -2194,7 +2223,6 @@ func (a *apexBundle) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 							if !android.DirectlyInAnyApex(ctx, cc.Name()) && !android.InList(cc.Name(), a.requiredDeps) {
 								a.requiredDeps = append(a.requiredDeps, cc.Name())
 							}
-							a.externalDeps = append(a.externalDeps, depName)
 							requireNativeLibs = append(requireNativeLibs, cc.OutputFile().Path().Base())
 							// Don't track further
 							return false
@@ -2202,8 +2230,6 @@ func (a *apexBundle) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 						af := apexFileForNativeLibrary(ctx, cc, handleSpecialLibs)
 						af.transitiveDep = true
 						filesInfo = append(filesInfo, af)
-						a.internalDeps = append(a.internalDeps, depName)
-						a.internalDeps = append(a.internalDeps, cc.AllStaticDeps()...)
 						return true // track transitive dependencies
 					}
 				} else if cc.IsTestPerSrcDepTag(depTag) {
@@ -2220,10 +2246,7 @@ func (a *apexBundle) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 						return true // track transitive dependencies
 					}
 				} else if java.IsJniDepTag(depTag) {
-					a.externalDeps = append(a.externalDeps, depName)
 					return true
-				} else if java.IsStaticLibDepTag(depTag) {
-					a.internalDeps = append(a.internalDeps, depName)
 				} else if am.CanHaveApexVariants() && am.IsInstallableToApex() {
 					ctx.ModuleErrorf("unexpected tag %q for indirect dependency %q", depTag, depName)
 				}

apex/apex_test.go

@@ -549,10 +549,11 @@ func TestBasicApex(t *testing.T) {
 	ensureListContains(t, noticeInputs, "custom_notice")
 
 	depsInfo := strings.Split(ctx.ModuleForTests("myapex", "android_common_myapex_image").Output("myapex-deps-info.txt").Args["content"], "\\n")
-	ensureListContains(t, depsInfo, "internal myjar")
-	ensureListContains(t, depsInfo, "internal mylib")
-	ensureListContains(t, depsInfo, "internal mylib2")
-	ensureListContains(t, depsInfo, "internal myotherjar")
+	ensureListContains(t, depsInfo, "myjar <- myapex")
+	ensureListContains(t, depsInfo, "mylib <- myapex")
+	ensureListContains(t, depsInfo, "mylib2 <- mylib")
+	ensureListContains(t, depsInfo, "myotherjar <- myjar")
+	ensureListContains(t, depsInfo, "mysharedjar (external) <- myjar")
 }
 
 func TestDefaults(t *testing.T) {
@@ -796,6 +797,7 @@ func TestApexWithExplicitStubsDependency(t *testing.T) {
 			name: "mylib",
 			srcs: ["mylib.cpp"],
 			shared_libs: ["libfoo#10"],
+			static_libs: ["libbaz"],
 			system_shared_libs: [],
 			stl: "none",
 			apex_available: [ "myapex2" ],
@@ -819,6 +821,14 @@ func TestApexWithExplicitStubsDependency(t *testing.T) {
 			stl: "none",
 		}
 
+		cc_library_static {
+			name: "libbaz",
+			srcs: ["mylib.cpp"],
+			system_shared_libs: [],
+			stl: "none",
+			apex_available: [ "myapex2" ],
+		}
+
 	`)
 
 	apexRule := ctx.ModuleForTests("myapex2", "android_common_myapex2_image").Rule("apexRule")
@@ -846,10 +856,10 @@ func TestApexWithExplicitStubsDependency(t *testing.T) {
 	ensureNotContains(t, libFooStubsLdFlags, "libbar.so")
 
 	depsInfo := strings.Split(ctx.ModuleForTests("myapex2", "android_common_myapex2_image").Output("myapex2-deps-info.txt").Args["content"], "\\n")
-	ensureListContains(t, depsInfo, "internal mylib")
-	ensureListContains(t, depsInfo, "external libfoo")
-	ensureListNotContains(t, depsInfo, "internal libfoo")
-	ensureListNotContains(t, depsInfo, "external mylib")
+
+	ensureListContains(t, depsInfo, "mylib <- myapex2")
+	ensureListContains(t, depsInfo, "libbaz <- mylib")
+	ensureListContains(t, depsInfo, "libfoo (external) <- mylib")
 }
 
 func TestApexWithRuntimeLibsDependency(t *testing.T) {

apex/builder.go

@@ -596,19 +596,14 @@ func (a *apexBundle) buildApexDependencyInfo(ctx android.ModuleContext) {
 		return
 	}
 
-	internalDeps := a.internalDeps
-	externalDeps := a.externalDeps
-
-	internalDeps = android.SortedUniqueStrings(internalDeps)
-	externalDeps = android.SortedUniqueStrings(externalDeps)
-	externalDeps = android.RemoveListFromList(externalDeps, internalDeps)
-
 	var content strings.Builder
-	for _, name := range internalDeps {
-		fmt.Fprintf(&content, "internal %s\\n", name)
+	for _, key := range android.SortedStringKeys(a.depInfos) {
+		info := a.depInfos[key]
+		toName := info.to
+		if info.isExternal {
+			toName = toName + " (external)"
 		}
-	for _, name := range externalDeps {
-		fmt.Fprintf(&content, "external %s\\n", name)
+		fmt.Fprintf(&content, "%s <- %s\\n", toName, strings.Join(android.SortedUniqueStrings(info.from), ", "))
 	}
 
 	depsInfoFile := android.PathForOutput(ctx, a.Name()+"-deps-info.txt")

cc/cc.go

@@ -403,13 +403,6 @@ func IsSharedDepTag(depTag blueprint.DependencyTag) bool {
 	return ok && ccDepTag.Shared
 }
 
-func IsStaticDepTag(depTag blueprint.DependencyTag) bool {
-	ccDepTag, ok := depTag.(DependencyTag)
-	return ok && (ccDepTag == staticExportDepTag ||
-		ccDepTag == lateStaticDepTag ||
-		ccDepTag == wholeStaticDepTag)
-}
-
 func IsRuntimeDepTag(depTag blueprint.DependencyTag) bool {
 	ccDepTag, ok := depTag.(DependencyTag)
 	return ok && ccDepTag == runtimeDepTag
@@ -475,9 +468,6 @@ type Module struct {
 	makeLinkType string
 	// Kythe (source file indexer) paths for this compilation module
 	kytheFiles android.Paths
-
-	// name of the modules that are direct or indirect static deps of this module
-	allStaticDeps []string
 }
 
 func (c *Module) Toc() android.OptionalPath {
@@ -1288,15 +1278,6 @@ func orderStaticModuleDeps(module LinkableInterface, staticDeps []LinkableInterf
 	return results
 }
 
-func gatherTransitiveStaticDeps(staticDeps []LinkableInterface) []string {
-	var ret []string
-	for _, dep := range staticDeps {
-		ret = append(ret, dep.Module().Name())
-		ret = append(ret, dep.AllStaticDeps()...)
-	}
-	return android.FirstUniqueStrings(ret)
-}
-
 func (c *Module) IsTestPerSrcAllTestsVariation() bool {
 	test, ok := c.linker.(testPerSrc)
 	return ok && test.isAllTestsVariation()
@@ -2378,8 +2359,6 @@ func (c *Module) depsToPaths(ctx android.ModuleContext) PathDeps {
 		c.sabi.Properties.ReexportedIncludes = android.FirstUniqueStrings(c.sabi.Properties.ReexportedIncludes)
 	}
 
-	c.allStaticDeps = gatherTransitiveStaticDeps(directStaticDeps)
-
 	return depPaths
 }
 
@@ -2539,10 +2518,6 @@ func (c *Module) installable() bool {
 	return false
 }
 
-func (c *Module) AllStaticDeps() []string {
-	return c.allStaticDeps
-}
-
 func (c *Module) AndroidMkWriteAdditionalDependenciesForSourceAbiDiff(w io.Writer) {
 	if c.linker != nil {
 		if library, ok := c.linker.(*libraryDecorator); ok {

cc/linkable.go

@@ -54,8 +54,6 @@ type LinkableInterface interface {
 	ToolchainLibrary() bool
 	NdkPrebuiltStl() bool
 	StubDecorator() bool
-
-	AllStaticDeps() []string
 }
 
 type DependencyTag struct {

rust/rust.go

@@ -354,11 +354,6 @@ func (mod *Module) GetStaticVariant() cc.LinkableInterface {
 	return nil
 }
 
-func (mod *Module) AllStaticDeps() []string {
-	// TODO(jiyong): do this for rust?
-	return nil
-}
-
 func (mod *Module) Module() android.Module {
 	return mod
 }