Stop interpreter from accessing code items of compiled code.

The ArtInterpreterToCompiledCodeBridge accesses the code item in a
number of places to handle argument marshalling. However, the code item
of a compiled method should have no need to be accessed by the runtime
at all, since the code has been compiled. By removing these accesses,
there is a drop in the memory footprint of the dex file, since these
code items remain untouched by the runtime.

Maps Vdex Memory Usage: 19.4/33.4MB -> 18.8/33.4MB

Bug: 35800981
Test: mm test-art-host
Change-Id: I147a9267ec022547b384374e1449d20bcab1ead2

1 files changed, 5 insertions, 1 deletions

diff --git a/runtime/interpreter/interpreter.cc b/runtime/interpreter/interpreter.cc
index bf49e84760..f3ca3383a5 100644
--- a/runtime/interpreter/interpreter.cc
+++ b/runtime/interpreter/interpreter.cc
@@ -264,7 +264,11 @@ static inline JValue Execute(
 
           // Pop the shadow frame before calling into compiled code.
           self->PopShadowFrame();
-          ArtInterpreterToCompiledCodeBridge(self, nullptr, code_item, &shadow_frame, &result);
+          // Calculate the offset of the first input reg. The input registers are in the high regs.
+          // The frame may only contain room for the inputs, in which case the arg offset is 0.
+          uint16_t arg_offset = code_item->registers_size_ == shadow_frame.NumberOfVRegs() ?
+              code_item->registers_size_ - code_item->ins_size_ : 0;
+          ArtInterpreterToCompiledCodeBridge(self, nullptr, &shadow_frame, arg_offset, &result);
           // Push the shadow frame back as the caller will expect it.
           self->PushShadowFrame(&shadow_frame);