Implement proper scoping for "this" in arrow functions

src/ppc/full-codegen-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 105 matching lines @@
 #ifdef DEBUG
   if (strlen(FLAG_stop_at) > 0 &&
       info->function()->name()->IsUtf8EqualTo(CStrVector(FLAG_stop_at))) {
     __ stop("stop-at");
   }
 #endif
 
   // Sloppy mode functions and builtins need to replace the receiver with the
   // global proxy when called as functions (without an explicit receiver
   // object).
-  if (info->strict_mode() == SLOPPY && !info->is_native()) {
+  if (info->strict_mode() == SLOPPY && !info->is_native() &&
+      info->scope()->has_this_declaration()) {
     Label ok;
     int receiver_offset = info->scope()->num_parameters() * kPointerSize;
     __ LoadP(r5, MemOperand(sp, receiver_offset), r0);
     __ CompareRoot(r5, Heap::kUndefinedValueRootIndex);
     __ bne(&ok);
 
     __ LoadP(r5, GlobalObjectOperand());
     __ LoadP(r5, FieldMemOperand(r5, GlobalObject::kGlobalProxyOffset));
 
     __ StoreP(r5, MemOperand(sp, receiver_offset), r0);
@@ skipping 76 matching lines @@
       __ push(r4);
       __ CallRuntime(Runtime::kNewFunctionContext, 1);
     }
     function_in_register = false;
     // Context is returned in r3.  It replaces the context passed to us.
     // It's saved in the stack and kept live in cp.
     __ mr(cp, r3);
     __ StoreP(r3, MemOperand(fp, StandardFrameConstants::kContextOffset));
     // Copy any necessary parameters into the context.
     int num_parameters = info->scope()->num_parameters();
-    for (int i = 0; i < num_parameters; i++) {
-      Variable* var = scope()->parameter(i);
+    int first_parameter = info->scope()->has_this_declaration() ? -1 : 0;
+    for (int i = first_parameter; i < num_parameters; i++) {
+      Variable* var = (i == -1) ? scope()->receiver() : scope()->parameter(i);
       if (var->IsContextSlot()) {
         int parameter_offset = StandardFrameConstants::kCallerSPOffset +
                                (num_parameters - 1 - i) * kPointerSize;
         // Load parameter from stack.
         __ LoadP(r3, MemOperand(fp, parameter_offset), r0);
         // Store it in the context.
         MemOperand target = ContextOperand(cp, var->index());
         __ StoreP(r3, target, r0);
 
         // Update the write barrier.
@@ skipping 5048 matching lines @@
     return ON_STACK_REPLACEMENT;
   }
 
   DCHECK(interrupt_address ==
          isolate->builtins()->OsrAfterStackCheck()->entry());
   return OSR_AFTER_STACK_CHECK;
 }
 }
 }  // namespace v8::internal
 #endif  // V8_TARGET_ARCH_PPC