MIPS: port Remove the fcontext field from all contexts.

src/mips/full-codegen-mips.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 700 matching lines @@
         break;
 
       case Slot::CONTEXT:
         // We bypass the general EmitSlotSearch because we know more about
         // this specific context.
 
         // The variable in the decl always resides in the current function
         // context.
         ASSERT_EQ(0, scope()->ContextChainLength(variable->scope()));
         if (FLAG_debug_code) {
-          // Check that we're not inside a 'with'.
-          __ lw(a1, ContextOperand(cp, Context::FCONTEXT_INDEX));
-          __ Check(eq, "Unexpected declaration in current context.",
-                   a1, Operand(cp));
+          // Check that we're not inside a with or catch context.
+          __ lw(a1, FieldMemOperand(cp, HeapObject::kMapOffset));
+          __ LoadRoot(t0, Heap::kWithContextMapRootIndex);
+          __ Check(ne, "Declaration in with context.",
+                   a1, Operand(t0));
+          __ LoadRoot(t0, Heap::kCatchContextMapRootIndex);
+          __ Check(ne, "Declaration in catch context.",
+                   a1, Operand(t0));
         }
         if (mode == Variable::CONST) {
           __ LoadRoot(at, Heap::kTheHoleValueRootIndex);
           __ sw(at, ContextOperand(cp, slot->index()));
           // No write barrier since the_hole_value is in old space.
         } else if (function != NULL) {
           VisitForAccumulatorValue(function);
           __ sw(result_register(), ContextOperand(cp, slot->index()));
           int offset = Context::SlotOffset(slot->index());
           // We know that we have written a function, which is not a smi.
@@ skipping 1137 matching lines @@
         // No const parameters.
         UNREACHABLE();
         break;
       case Slot::LOCAL:
         // Detect const reinitialization by checking for the hole value.
         __ lw(a1, MemOperand(fp, SlotOffset(slot)));
         __ LoadRoot(t0, Heap::kTheHoleValueRootIndex);
         __ Branch(&skip, ne, a1, Operand(t0));
         __ sw(result_register(), MemOperand(fp, SlotOffset(slot)));
         break;
-      case Slot::CONTEXT: {
-        __ lw(a1, ContextOperand(cp, Context::FCONTEXT_INDEX));
-        __ lw(a2, ContextOperand(a1, slot->index()));
-        __ LoadRoot(t0, Heap::kTheHoleValueRootIndex);
-        __ Branch(&skip, ne, a2, Operand(t0));
-        __ sw(result_register(), ContextOperand(a1, slot->index()));
-        int offset = Context::SlotOffset(slot->index());
-        __ mov(a3, result_register());  // Preserve the stored value in v0.
-        __ RecordWrite(a1, Operand(offset), a3, a2);
-        break;
-      }
+      case Slot::CONTEXT:
       case Slot::LOOKUP:
         __ push(result_register());
         __ li(a0, Operand(slot->var()->name()));
         __ Push(cp, a0);  // Context and name.
         __ CallRuntime(Runtime::kInitializeConstContextSlot, 3);
         break;
     }
     __ bind(&skip);
 
   } else if (var->mode() != Variable::CONST) {
@@ skipping 2369 matching lines @@
   __ Addu(at, a1, Operand(masm_->CodeObject()));
   __ Jump(at);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS