AOT: Single target stub.

runtime/vm/stub_code_arm64.cc

Index: runtime/vm/stub_code_arm64.cc
diff --git a/runtime/vm/stub_code_arm64.cc b/runtime/vm/stub_code_arm64.cc
index 3f9663cac2dbbf399902a304b42b1375320e5aaf..f550777f342d2d3d90986871b092db5b0baae185 100644
--- a/runtime/vm/stub_code_arm64.cc
+++ b/runtime/vm/stub_code_arm64.cc
@@ -2183,6 +2183,50 @@ void StubCode::GenerateICCallThroughCodeStub(Assembler* assembler) {
 }
 
 
+// Called from switchable IC calls.
+//  R0: receiver
+//  R5: SingleTargetCache
+// Passed to target:
+//  CODE_REG: target Code object
+void StubCode::GenerateSingleTargetCallStub(Assembler* assembler) {
+  __ NoMonomorphicCheckedEntry();
+
+  Label miss;
+
+  __ LoadClassIdMayBeSmi(R1, R0);
+  __ ldr(R2, FieldAddress(R5, SingleTargetCache::lower_limit_offset()),
+         kUnsignedWord);
+  __ ldr(R3, FieldAddress(R5, SingleTargetCache::upper_limit_offset()),
+         kUnsignedWord);
+
+  __ cmp(R1, Operand(R2));
+  __ b(&miss, LT);
+  __ cmp(R1, Operand(R3));
+  __ b(&miss, GT);
+
+  __ ldr(R1, FieldAddress(R5, SingleTargetCache::entry_point_offset()));
+  __ ldr(CODE_REG, FieldAddress(R5, SingleTargetCache::target_offset()));
+  __ br(R1);
+
+  __ Bind(&miss);
+  __ EnterStubFrame();
+  __ Push(R0);  // Preserve receiver.
+
+  __ PushObject(Object::null_object());  // Result.
+  __ Push(R0);                           // Arg0: Receiver
+  __ CallRuntime(kSingleTargetMissRuntimeEntry, 1);
+  __ Drop(1);
+  __ Pop(R5);  // result = IC
+
+  __ Pop(R0);  // Restore receiver.
+  __ LeaveStubFrame();
+
+  __ ldr(CODE_REG, Address(THR, Thread::ic_lookup_through_code_stub_offset()));
+  __ ldr(R1, FieldAddress(CODE_REG, Code::checked_entry_point_offset()));
+  __ br(R1);
+}
+
+
 // Called from the monomorphic checked entry.
 //  R0: receiver
 void StubCode::GenerateMonomorphicMissStub(Assembler* assembler) {