Speed up method lookup in a different dex file.

Use already known name and proto.

Change-Id: I4505b81724bd6a0f3cf21ee6fed44774d38c4e15

1 files changed, 4 insertions, 2 deletions

diff --git a/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc b/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
index 9f30190..f9486c3 100644
--- a/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
+++ b/runtime/entrypoints/quick/quick_trampoline_entrypoints.cc
@@ -561,9 +561,11 @@ extern "C" const void* artQuickResolutionTrampoline(mirror::ArtMethod* called,
         caller->GetDexCacheResolvedMethods()->Set(called->GetDexMethodIndex(), called);
       } else {
         // Calling from one dex file to another, need to compute the method index appropriate to
-        // the caller's dex file.
+        // the caller's dex file. Since we get here only if the original called was a runtime
+        // method, we've got the correct dex_file and a dex_method_idx from above.
+        DCHECK(&MethodHelper(caller).GetDexFile() == dex_file);
         uint32_t method_index =
-            MethodHelper(called).FindDexMethodIndexInOtherDexFile(MethodHelper(caller).GetDexFile());
+            MethodHelper(called).FindDexMethodIndexInOtherDexFile(*dex_file, dex_method_idx);
         if (method_index != DexFile::kDexNoIndex) {
           caller->GetDexCacheResolvedMethods()->Set(method_index, called);
         }