Add a fast path for nterp entrypoint to avoid fetching the shorty.

When all parameters are references, we don't need to look at the shorty.
Use the 0x00100000 flag in the modifiers which is free for non-native
methods.

Test: test.py
Bug: 112676029
Change-Id: Ied9a253f7f7230045dd13188a5b806fb1d6d019d

1 files changed, 11 insertions, 0 deletions

diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index e894037ae3..2040263cc6 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -3838,6 +3838,17 @@ void ClassLinker::LoadMethod(const DexFile& dex_file,
     } else {
       dst->SetCodeItem(dst->GetDexFile()->GetCodeItem(method.GetCodeItemOffset()));
     }
+    bool has_all_references = true;
+    const char* shorty = dst->GetShorty();
+    for (size_t i = 1, e = strlen(shorty); i < e; ++i) {
+      if (shorty[i] != 'L') {
+        has_all_references = false;
+        break;
+      }
+    }
+    if (has_all_references) {
+      dst->SetNterpEntryPointFastPathFlag();
+    }
   } else {
     dst->SetDataPtrSize(nullptr, image_pointer_size_);
     DCHECK_EQ(method.GetCodeItemOffset(), 0u);