Preserve <uses-library> order in dexpreopt.config files.

Library order is important because it is used to construct class loader
context, which is then written into OAT/ODEX files and chacked against
class loader context constructed by PackageManager on the device. If the
orders are different, dexpreopted code is rejected.

This CL fixes a few problems that caused reordering:

- 'filter' function arguments are swapped so that patterns list comes
  first, and the library list second

- JSON representation of class loader context is changed to avoid
  unmarshaling it to Go maps, which may reorder keys

- library list is no longer sorted (it's unclear why it was sorted)

Bug: 132357300
Test: lunch cf_x86_64_phone-userdebug && m && launch_cvd \
      adb wait-for-device && adb root && adb logcat \
      | grep -E 'ClassLoaderContext [a-z ]+ mismatch'
      # empty grep output, no errors
Change-Id: Ie76996d497e60da0948f1879d6db589ff3e968a2

common/json.mk

@@ -24,7 +24,10 @@ add_json_list =$= $(call add_json_val,$(1),$(call json_list,$(patsubst %,%,$(2))
 add_json_csv =$= $(call add_json_val,$(1),$(call csv_to_json_list,$(strip $(2))))
 add_json_bool =$= $(call add_json_val,$(1),$(if $(strip $(2)),true,false))
 add_json_map =$= $(eval _json_contents := $$(_json_contents)$$(_json_indent)"$$(strip $$(1))": {$$(newline))$(json_increase_indent)
+add_json_map_anon =$= $(eval _json_contents := $$(_json_contents)$$(_json_indent){$$(newline))$(json_increase_indent)
 end_json_map =$= $(json_decrease_indent)$(eval _json_contents := $$(_json_contents)$$(if $$(filter %$$(comma),$$(lastword $$(_json_contents))),__SV_END)$$(_json_indent)},$$(newline))
+add_json_array =$= $(eval _json_contents := $$(_json_contents)$$(_json_indent)"$$(strip $$(1))": [$$(newline))$(json_increase_indent)
+end_json_array =$= $(json_decrease_indent)$(eval _json_contents := $$(_json_contents)$$(if $$(filter %$$(comma),$$(lastword $$(_json_contents))),__SV_END)$$(_json_indent)],$$(newline))
 
 # Clears _json_contents to start a new json file
 json_start =$= $(eval _json_contents := {$$(newline))$(eval _json_indent := $$(4space))

core/dex_preopt_config_merger.py

@@ -67,24 +67,25 @@ def main():
   # the loop in case this changes in the future.
   for sdk_ver in clc_map:
     clcs = clc_map[sdk_ver]
-    clcs2 = OrderedDict()
+    clcs2 = []
-    for lib in clcs:
+    for clc in clcs:
-      clc = clcs[lib]
+      lib = clc['Name']
       if lib in uses_libs:
         ulib = uses_libs[lib]
+        # The real <uses-library> name (may be different from the module name).
+        clc['Name'] = ulib['ProvidesUsesLibrary']
         # On-device (install) path to the dependency DEX jar file.
         clc['Device'] = ulib['DexLocation']
         # CLC of the dependency becomes a subcontext. We only need sub-CLC for
         # 'any' version because all other versions are for compatibility
         # libraries, which exist only for apps and not for libraries.
         clc['Subcontexts'] = ulib['ClassLoaderContexts'].get('any')
-        # Patch the library name in the CLC as well.
-        clcs2[ulib['ProvidesUsesLibrary']] = clc
       else:
         # dexpreopt.config for this <uses-library> is not among the script
         # arguments, which may be the case with compatibility libraries that
         # don't need patching anyway. Just use the original CLC.
-        clcs2[lib] = clc
+        pass
+      clcs2.append(clc)
     clc_map2[sdk_ver] = clcs2
 
   # Overwrite the original class loader context with the patched one.

core/dex_preopt_odex_install.mk

@@ -196,8 +196,8 @@ ifdef LOCAL_DEX_PREOPT
   # to load dexpreopt code on device. We should fix this, either by deferring
   # dependency computation until the full list of product packages is known, or
   # by adding product-specific lists of missing libraries.
-  my_filtered_optional_uses_libraries := $(filter $(my_filtered_optional_uses_libraries), \
+  my_filtered_optional_uses_libraries := $(filter $(PRODUCT_PACKAGES), \
-    $(PRODUCT_PACKAGES))
+    $(my_filtered_optional_uses_libraries))
 
   ifeq ($(LOCAL_MODULE_CLASS),APPS)
     # compatibility libraries are added to class loader context of an app only if
@@ -222,10 +222,9 @@ ifdef LOCAL_DEX_PREOPT
     my_dexpreopt_libs_compat :=
   endif
 
-  my_dexpreopt_libs := $(sort \
+  my_dexpreopt_libs := \
     $(LOCAL_USES_LIBRARIES) \
-    $(my_filtered_optional_uses_libraries) \
+    $(my_filtered_optional_uses_libraries)
-  )
 
   # 1: SDK version
   # 2: list of libraries
@@ -243,14 +242,15 @@ ifdef LOCAL_DEX_PREOPT
   # which are special and not handled by dex_preopt_config_merger.py.
   #
   add_json_class_loader_context = \
-    $(call add_json_map, $(1)) \
+    $(call add_json_array, $(1)) \
     $(foreach lib, $(2),\
-      $(call add_json_map, $(lib)) \
+      $(call add_json_map_anon) \
+      $(call add_json_str, Name, $(lib)) \
       $(call add_json_str, Host, $(call intermediates-dir-for,JAVA_LIBRARIES,$(lib),,COMMON)/javalib.jar) \
       $(call add_json_str, Device, /system/framework/$(lib).jar) \
-      $(call add_json_map, Subcontexts, ${$}) $(call end_json_map) \
+      $(call add_json_val, Subcontexts, null) \
       $(call end_json_map)) \
-    $(call end_json_map)
+    $(call end_json_array)
 
   # Record dex-preopt config.
   DEXPREOPT.$(LOCAL_MODULE).DEX_PREOPT := $(LOCAL_DEX_PREOPT)