Add singleton rule for hiddenapi list generation

The lists of public/private APIs used for non-SDK API restriction
enforcement used to be generated by Doclava. In Q we're switching
to resolving android.jar (and other SDK stub JARs) against the boot
class path directly to avoid lowering Doclava's high-level view of
the framework and issues related to it.

This patch adds a new build rule which invokes `hiddenapi` on all
boot class path dex files simultaneously. The tool generates two
text files - one with public and one with private APIs.

Bug: 79409988
Test: m out/target/common/obj/PACKAGING/hiddenapi-private-list.txt
Change-Id: I826d8ac513a41a1d6d5e29a8300073158cff5acf
Merged-In: I826d8ac513a41a1d6d5e29a8300073158cff5acf
(cherry picked from commit a39db48511fdcdd03b74feb55461199e2a4dbdc1)
diff --git a/core/config.mk b/core/config.mk
index 0ef5e33..7e5ba31 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -1072,6 +1072,8 @@
 INTERNAL_PLATFORM_SYSTEM_PRIVATE_DEX_API_FILE := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/system-private-dex.txt
 endif
 
+INTERNAL_PLATFORM_HIDDENAPI_PUBLIC_LIST := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/hiddenapi-public-list.txt
+INTERNAL_PLATFORM_HIDDENAPI_PRIVATE_LIST := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/hiddenapi-private-list.txt
 INTERNAL_PLATFORM_HIDDENAPI_LIGHT_GREYLIST := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/hiddenapi-light-greylist.txt
 INTERNAL_PLATFORM_HIDDENAPI_DARK_GREYLIST := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/hiddenapi-dark-greylist.txt
 INTERNAL_PLATFORM_HIDDENAPI_BLACKLIST := $(TARGET_OUT_COMMON_INTERMEDIATES)/PACKAGING/hiddenapi-blacklist.txt
diff --git a/core/definitions.mk b/core/definitions.mk
index 8ff3398..ec71da0 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -2837,6 +2837,7 @@
 endef
 
 # Copy dex files, invoking $(HIDDENAPI) on them in the process.
+# Also make the source dex file an input of the hiddenapi singleton rule in dex_preopt.mk.
 define hiddenapi-copy-dex-files
 $(2): $(1) $(HIDDENAPI) $(INTERNAL_PLATFORM_HIDDENAPI_LIGHT_GREYLIST) \
       $(INTERNAL_PLATFORM_HIDDENAPI_DARK_GREYLIST) $(INTERNAL_PLATFORM_HIDDENAPI_BLACKLIST)
@@ -2848,6 +2849,10 @@
 	    --light-greylist=$(INTERNAL_PLATFORM_HIDDENAPI_LIGHT_GREYLIST) \
 	    --dark-greylist=$(INTERNAL_PLATFORM_HIDDENAPI_DARK_GREYLIST) \
 	    --blacklist=$(INTERNAL_PLATFORM_HIDDENAPI_BLACKLIST)
+
+$(INTERNAL_PLATFORM_HIDDENAPI_PRIVATE_LIST): $(1)
+$(INTERNAL_PLATFORM_HIDDENAPI_PRIVATE_LIST): \
+    PRIVATE_DEX_INPUTS := $$(PRIVATE_DEX_INPUTS) $(1)
 endef
 
 # File names for intermediate dex files of `hiddenapi-copy-soong-jar`.
diff --git a/core/dex_preopt.mk b/core/dex_preopt.mk
index 2a205cd..00da02b 100644
--- a/core/dex_preopt.mk
+++ b/core/dex_preopt.mk
@@ -90,6 +90,39 @@
 $(TARGET_2ND_ARCH_VAR_PREFIX)DEXPREOPT_ONE_FILE_DEPENDENCY_BUILT_BOOT_PREOPT := $($(TARGET_2ND_ARCH_VAR_PREFIX)DEFAULT_DEX_PREOPT_BUILT_IMAGE_FILENAME)
 endif  # TARGET_2ND_ARCH
 
+# === hiddenapi rules ===
+
+hiddenapi_stubs_jar = $(call intermediates-dir-for,JAVA_LIBRARIES,$(1),,COMMON)/javalib.jar
+
+# Public API stubs
+HIDDENAPI_STUBS := \
+    $(call hiddenapi_stubs_jar,android_stubs_current) \
+    $(call hiddenapi_stubs_jar,android.test.base.stubs) \
+    $(call hiddenapi_stubs_jar,android.test.mock.stubs) \
+    $(call hiddenapi_stubs_jar,android.test.runner.stubs)
+
+# System API stubs
+HIDDENAPI_STUBS += \
+    $(call hiddenapi_stubs_jar,android_system_stubs_current)
+
+# Test API stubs
+HIDDENAPI_STUBS += \
+    $(call hiddenapi_stubs_jar,android_test_stubs_current)
+
+# Singleton rule which applies $(HIDDENAPI) on all boot class path dex files.
+# Inputs are filled with `hiddenapi-copy-dex-files` rules.
+$(INTERNAL_PLATFORM_HIDDENAPI_PRIVATE_LIST): \
+    PRIVATE_HIDDENAPI_STUBS := $(HIDDENAPI_STUBS)
+$(INTERNAL_PLATFORM_HIDDENAPI_PRIVATE_LIST): \
+    .KATI_IMPLICIT_OUTPUTS := $(INTERNAL_PLATFORM_HIDDENAPI_PUBLIC_LIST)
+$(INTERNAL_PLATFORM_HIDDENAPI_PRIVATE_LIST): $(HIDDENAPI) $(HIDDENAPI_STUBS)
+	for INPUT_DEX in $(PRIVATE_DEX_INPUTS); do \
+		find `dirname $${INPUT_DEX}` -maxdepth 1 -name "classes*.dex"; \
+	done | sort | sed 's/^/--boot-dex=/' | xargs $(HIDDENAPI) list \
+	    $(addprefix --stub-dex=,$(PRIVATE_HIDDENAPI_STUBS)) \
+	    --out-public=$(INTERNAL_PLATFORM_HIDDENAPI_PUBLIC_LIST) \
+	    --out-private=$(INTERNAL_PLATFORM_HIDDENAPI_PRIVATE_LIST)
+
 ifeq ($(PRODUCT_DIST_BOOT_AND_SYSTEM_JARS),true)
 boot_profile_jars_zip := $(PRODUCT_OUT)/boot_profile_jars.zip
 all_boot_jars := \