[turbofan] Advance bytecode offset after lazy deopt.

src/builtins/arm/builtins-arm.cc

Index: src/builtins/arm/builtins-arm.cc
diff --git a/src/builtins/arm/builtins-arm.cc b/src/builtins/arm/builtins-arm.cc
index f535ae785aa20fb89b4a73f915a19f7d8246f36c..9f12e85b80af40154ac85e433392bb4e6f86468d 100644
--- a/src/builtins/arm/builtins-arm.cc
+++ b/src/builtins/arm/builtins-arm.cc
@@ -1296,7 +1296,7 @@ void Builtins::Generate_InterpreterPushArgsAndConstructArray(
   }
 }
 
-void Builtins::Generate_InterpreterEnterBytecodeDispatch(MacroAssembler* masm) {
+static void Generate_InterpreterEnterBytecode(MacroAssembler* masm) {
   // Set the return address to the correct point in the interpreter entry
   // trampoline.
   Smi* interpreter_entry_return_pc_offset(
@@ -1337,6 +1337,34 @@ void Builtins::Generate_InterpreterEnterBytecodeDispatch(MacroAssembler* masm) {
   __ mov(pc, ip);
 }
 
+void Builtins::Generate_InterpreterEnterBytecodeAdvance(MacroAssembler* masm) {
+  // Advance the current bytecode offset stored within the given interpreter
+  // stack frame. This simulates what all bytecode handlers do upon completion
+  // of the underlying operation.
+  {
+    FrameScope scope(masm, StackFrame::MANUAL);

[rmcilroy, 2016/11/09 14:48:29]

Any reason this couldn't be a standard runtime call? It would seem simpler to me
rather than having to prepare a C++ call frame. 

[Michael Starzinger, 2016/11/10 10:09:40]

Done.

+    __ stm(db_w, sp, kCallerSaved);
+    __ PrepareCallCFunction(2, 0, r1);
+    __ ldr(r0, MemOperand(fp, InterpreterFrameConstants::kBytecodeArrayFromFp));
+    __ ldr(r1,
+           MemOperand(fp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
+    __ SmiUntag(r1);
+    __ CallCFunction(
+        ExternalReference::interpreter_advance_bytecode_offset(masm->isolate()),
+        2);
+    __ SmiTag(r0);
+    __ str(r0,
+           MemOperand(fp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
+    __ ldm(ia_w, sp, kCallerSaved);
+  }
+
+  Generate_InterpreterEnterBytecode(masm);
+}
+
+void Builtins::Generate_InterpreterEnterBytecodeDispatch(MacroAssembler* masm) {
+  Generate_InterpreterEnterBytecode(masm);
+}
+
 void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- r0 : argument count (preserved for callee)