[interpreter, debugger] support debug breaks via bytecode array copy

src/mips64/builtins-mips64.cc

Index: src/mips64/builtins-mips64.cc
diff --git a/src/mips64/builtins-mips64.cc b/src/mips64/builtins-mips64.cc
index a6c0d7630da3ce35d97fed17dcbbf65717e88017..ce4716bdd1442f80aa91a3b1a17a3de063e92844 100644
--- a/src/mips64/builtins-mips64.cc
+++ b/src/mips64/builtins-mips64.cc
@@ -970,8 +970,15 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
   // Get the bytecode array from the function object and load the pointer to the
   // first entry into kInterpreterBytecodeRegister.
   __ ld(a0, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
+  Label load_debug_bytecode_array, bytecode_array_loaded;
+  Register debug_info = kInterpreterBytecodeArrayRegister;
+  DCHECK(!debug_info.is(a0));
+  __ ld(debug_info, FieldMemOperand(a0, SharedFunctionInfo::kDebugInfoOffset));
+  __ Branch(&load_debug_bytecode_array, ne, debug_info,
+            Operand(DebugInfo::uninitialized()));
   __ ld(kInterpreterBytecodeArrayRegister,
         FieldMemOperand(a0, SharedFunctionInfo::kFunctionDataOffset));
+  __ bind(&bytecode_array_loaded);
 
   if (FLAG_debug_code) {
     // Check function data field is actually a BytecodeArray object.
@@ -1042,6 +1049,12 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
 
   // Even though the first bytecode handler was called, we will never return.
   __ Abort(kUnexpectedReturnFromBytecodeHandler);
+
+  // Load debug copy of the bytecode array.
+  __ bind(&load_debug_bytecode_array);
+  __ ld(kInterpreterBytecodeArrayRegister,
+        FieldMemOperand(debug_info, DebugInfo::kAbstractCodeIndex));
+  __ Branch(&bytecode_array_loaded);
 }