Refactor sanitized library on-disk layout - Soong.

This CL moves the location of ASAN-ified libraries on disk in the
following manner:
/data/lib* --> /data/asan/system/lib*
/data/vendor/* --> /data/asan/vendor/*

There are a couple of advantages to this, including better isolation
from other components, and more transparent linker renaming and
SELinux policies.

Bug: 36574794
Bug: 36674745
Test: m -j40 && SANITIZE_TARGET="address" m -j40 and the device
boots. All sanitized libraries are correctly located in /data/asan/*.

Change-Id: I06bf459260ec451d4495a02562f640ad622f34c2

cc/cc.go

@@ -212,6 +212,7 @@ type installer interface {
 	installerProps() []interface{}
 	install(ctx ModuleContext, path android.Path)
 	inData() bool
+	inSanitizerDir() bool
 	hostToolPath() android.OptionalPath
 }
 
@@ -993,10 +994,17 @@ func (c *Module) InstallInData() bool {
 	if c.installer == nil {
 		return false
 	}
-	if c.sanitize != nil && c.sanitize.inData() {
+	return c.installer.inData()
+}
+
+func (c *Module) InstallInSanitizerDir() bool {
+	if c.installer == nil {
+		return false
+	}
+	if c.sanitize != nil && c.sanitize.inSanitizerDir() {
 		return true
 	}
-	return c.installer.inData()
+	return c.installer.inSanitizerDir()
 }
 
 func (c *Module) HostToolPath() android.OptionalPath {

cc/installer.go

@@ -30,8 +30,9 @@ type InstallerProperties struct {
 type installLocation int
 
 const (
-	InstallInSystem installLocation = 0
-	InstallInData                   = iota
+	InstallInSystem       installLocation = 0
+	InstallInData                         = iota
+	InstallInSanitizerDir                 = iota
 )
 
 func NewBaseInstaller(dir, dir64 string, location installLocation) *baseInstaller {
@@ -78,6 +79,10 @@ func (installer *baseInstaller) inData() bool {
 	return installer.location == InstallInData
 }
 
+func (installer *baseInstaller) inSanitizerDir() bool {
+	return installer.location == InstallInSanitizerDir
+}
+
 func (installer *baseInstaller) hostToolPath() android.OptionalPath {
 	return android.OptionalPath{}
 }

cc/library.go

@@ -349,8 +349,8 @@ func (library *libraryDecorator) getLibName(ctx ModuleContext) string {
 
 func (library *libraryDecorator) linkerInit(ctx BaseModuleContext) {
 	location := InstallInSystem
-	if library.sanitize.inData() {
-		location = InstallInData
+	if library.sanitize.inSanitizerDir() {
+		location = InstallInSanitizerDir
 	}
 	library.baseInstaller.location = location
 

cc/sanitize.go

@@ -97,7 +97,7 @@ type SanitizeProperties struct {
 
 	SanitizerEnabled bool `blueprint:"mutated"`
 	SanitizeDep      bool `blueprint:"mutated"`
-	InData           bool `blueprint:"mutated"`
+	InSanitizerDir   bool `blueprint:"mutated"`
 }
 
 type sanitize struct {
@@ -383,8 +383,8 @@ func (sanitize *sanitize) flags(ctx ModuleContext, flags Flags) Flags {
 	return flags
 }
 
-func (sanitize *sanitize) inData() bool {
-	return sanitize.Properties.InData
+func (sanitize *sanitize) inSanitizerDir() bool {
+	return sanitize.Properties.InSanitizerDir
 }
 
 func (sanitize *sanitize) Sanitizer(t sanitizerType) bool {
@@ -447,7 +447,7 @@ func sanitizerMutator(t sanitizerType) func(android.BottomUpMutatorContext) {
 				modules[0].(*Module).sanitize.Properties.SanitizeDep = false
 				modules[1].(*Module).sanitize.Properties.SanitizeDep = false
 				if mctx.Device() {
-					modules[1].(*Module).sanitize.Properties.InData = true
+					modules[1].(*Module).sanitize.Properties.InSanitizerDir = true
 				} else {
 					modules[0].(*Module).Properties.PreventInstall = true
 				}