Set the current context to the function's context when entering to LAP.

src/mips/code-stubs-mips.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 2926 matching lines @@
   //  -- a0                  : callee
   //  -- t0                  : call_data
   //  -- a2                  : holder
   //  -- a1                  : api_function_address
   //  -- cp                  : context
   //  --
   //  -- sp[0]               : last argument
   //  -- ...
   //  -- sp[(argc - 1)* 4]   : first argument
   //  -- sp[argc * 4]        : receiver
+  //  -- sp[(argc + 1)* 4]   : accessor_holder
   // -----------------------------------
 
   Register callee = a0;
   Register call_data = t0;
   Register holder = a2;
   Register api_function_address = a1;
   Register context = cp;
 
   typedef FunctionCallbackArguments FCA;
 
   STATIC_ASSERT(FCA::kContextSaveIndex == 6);
   STATIC_ASSERT(FCA::kCalleeIndex == 5);
   STATIC_ASSERT(FCA::kDataIndex == 4);
   STATIC_ASSERT(FCA::kReturnValueOffset == 3);
   STATIC_ASSERT(FCA::kReturnValueDefaultValueIndex == 2);
   STATIC_ASSERT(FCA::kIsolateIndex == 1);
   STATIC_ASSERT(FCA::kHolderIndex == 0);
   STATIC_ASSERT(FCA::kNewTargetIndex == 7);
   STATIC_ASSERT(FCA::kArgsLength == 8);
 
   // new target
   __ PushRoot(Heap::kUndefinedValueRootIndex);
 
   // Save context, callee and call data.
   __ Push(context, callee, call_data);
-  if (!is_lazy()) {
-    // Load context from callee.
-    __ lw(context, FieldMemOperand(callee, JSFunction::kContextOffset));
-  }
 
   Register scratch = call_data;
   __ LoadRoot(scratch, Heap::kUndefinedValueRootIndex);
   // Push return value and default return value.
   __ Push(scratch, scratch);
   __ li(scratch, Operand(ExternalReference::isolate_address(masm->isolate())));
   // Push isolate and holder.
   __ Push(scratch, holder);
 
+  // Enter a new context
+  if (is_lazy()) {
+    // Load context from accessor_holder
+    Register accessor_holder = context;
+    __ lw(accessor_holder,
+          MemOperand(sp, (FCA::kArgsLength + 1 + argc()) * kPointerSize));
+    __ lw(scratch, FieldMemOperand(accessor_holder, HeapObject::kMapOffset));
+    __ GetMapConstructor(scratch, scratch, context, callee);
+    __ lw(context, FieldMemOperand(scratch, JSFunction::kContextOffset));
+  } else {
+    // Load context from callee.
+    __ lw(context, FieldMemOperand(callee, JSFunction::kContextOffset));
+  }
+
   // Prepare arguments.
   __ mov(scratch, sp);
 
   // Allocate the v8::Arguments structure in the arguments' space since
   // it's not controlled by GC.
   const int kApiStackSpace = 3;
 
   FrameScope frame_scope(masm, StackFrame::MANUAL);
   __ EnterExitFrame(false, kApiStackSpace);
 
@@ skipping 105 matching lines @@
                            kStackUnwindSpace, kInvalidStackOffset,
                            return_value_operand, NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS