Move dexpreopt image selection out of dexpreopt package

Instead of passing both the module and global dexpreopt image
selection into the dexpreopt package, determine the correct
dexpreopt image in the java package.

Also stop using the boot image "location" as an input, only
track the real path, and then convert it to the "location"
that dex2oat expects when constructing the command line.

Test: m checkbuild
Change-Id: I2be2b5917e09fd57428dab27849c0153fdc75722
diff --git a/dexpreopt/dexpreopt.go b/dexpreopt/dexpreopt.go
index c38fbff..660a6d0 100644
--- a/dexpreopt/dexpreopt.go
+++ b/dexpreopt/dexpreopt.go
@@ -113,12 +113,9 @@
 
 			generateDM := shouldGenerateDM(module, global)
 
-			for _, arch := range module.Archs {
-				imageLocation := module.DexPreoptImageLocation
-				if imageLocation == "" {
-					imageLocation = global.DefaultDexPreoptImageLocation[arch]
-				}
-				dexpreoptCommand(global, module, rule, profile, arch, imageLocation, appImage, generateDM)
+			for i, arch := range module.Archs {
+				image := module.DexPreoptImages[i]
+				dexpreoptCommand(global, module, rule, profile, arch, image, appImage, generateDM)
 			}
 		}
 	}
@@ -181,7 +178,7 @@
 }
 
 func dexpreoptCommand(global GlobalConfig, module ModuleConfig, rule *android.RuleBuilder,
-	profile, arch, bootImageLocation string, appImage, generateDM bool) {
+	profile, arch, bootImage string, appImage, generateDM bool) {
 
 	// HACK: make soname in Soong-generated .odex files match Make.
 	base := filepath.Base(module.DexLocation)
@@ -213,11 +210,11 @@
 
 	invocationPath := pathtools.ReplaceExtension(odexPath, "invocation")
 
-	// bootImageLocation is $OUT/dex_bootjars/system/framework/boot.art, but dex2oat actually reads
-	// $OUT/dex_bootjars/system/framework/arm64/boot.art
-	var bootImagePath string
-	if bootImageLocation != "" {
-		bootImagePath = filepath.Join(filepath.Dir(bootImageLocation), arch, filepath.Base(bootImageLocation))
+	// bootImage is .../dex_bootjars/system/framework/arm64/boot.art, but dex2oat wants
+	// .../dex_bootjars/system/framework/boot.art on the command line
+	var bootImageLocation string
+	if bootImage != "" {
+		bootImageLocation = PathToLocation(bootImage, arch)
 	}
 
 	// Lists of used and optional libraries from the build config to be verified against the manifest in the APK
@@ -325,7 +322,7 @@
 		Flag("--runtime-arg").FlagWithArg("-Xbootclasspath-locations:", bcp_locations).
 		Flag("${class_loader_context_arg}").
 		Flag("${stored_class_loader_context_arg}").
-		FlagWithArg("--boot-image=", bootImageLocation).Implicit(bootImagePath).
+		FlagWithArg("--boot-image=", bootImageLocation).Implicit(bootImage).
 		FlagWithInput("--dex-file=", module.DexPath).
 		FlagWithArg("--dex-location=", module.DexLocation).
 		FlagWithOutput("--oat-file=", odexPath).ImplicitOutput(vdexPath).
@@ -521,6 +518,15 @@
 	return false
 }
 
+// PathToLocation converts .../system/framework/arm64/boot.art to .../system/framework/boot.art
+func PathToLocation(path, arch string) string {
+	pathArch := filepath.Base(filepath.Dir(path))
+	if pathArch != arch {
+		panic(fmt.Errorf("last directory in %q must be %q", path, arch))
+	}
+	return filepath.Join(filepath.Dir(filepath.Dir(path)), filepath.Base(path))
+}
+
 func pathForLibrary(module ModuleConfig, lib string) string {
 	path := module.LibraryPaths[lib]
 	if path == "" {