Revert of [strong] Implement strong mode restrictions on property access

src/ic/mips/ic-mips.cc

Index: src/ic/mips/ic-mips.cc
diff --git a/src/ic/mips/ic-mips.cc b/src/ic/mips/ic-mips.cc
index 0170959180396490119f36d05eef659d8f467d7b..7dbaad788ae0b1558432c0c13504c27e51eeb528 100644
--- a/src/ic/mips/ic-mips.cc
+++ b/src/ic/mips/ic-mips.cc
@@ -163,8 +163,7 @@
 static void GenerateFastArrayLoad(MacroAssembler* masm, Register receiver,
                                   Register key, Register elements,
                                   Register scratch1, Register scratch2,
-                                  Register result, Label* slow,
-                                  LanguageMode language_mode) {
+                                  Register result, Label* slow) {
   // Register use:
   //
   // receiver - holds the receiver on entry.
@@ -186,7 +185,7 @@
   //
   // scratch2 - used to hold maps, prototypes, and the loaded value.
   Label check_prototypes, check_next_prototype;
-  Label done, in_bounds, absent;
+  Label done, in_bounds, return_undefined;
 
   __ lw(elements, FieldMemOperand(receiver, JSObject::kElementsOffset));
   __ AssertFastElements(elements);
@@ -204,7 +203,7 @@
   __ lw(scratch2, FieldMemOperand(scratch2, Map::kPrototypeOffset));
   // scratch2: current prototype
   __ LoadRoot(at, Heap::kNullValueRootIndex);
-  __ Branch(&absent, eq, scratch2, Operand(at));
+  __ Branch(&return_undefined, eq, scratch2, Operand(at));
   __ lw(elements, FieldMemOperand(scratch2, JSObject::kElementsOffset));
   __ lw(scratch2, FieldMemOperand(scratch2, HeapObject::kMapOffset));
   // elements: elements of current prototype
@@ -219,14 +218,9 @@
   __ Branch(slow, ne, elements, Operand(at));
   __ Branch(&check_next_prototype);
 
-  __ bind(&absent);
-  if (is_strong(language_mode)) {
-    // Strong mode accesses must throw in this case, so call the runtime.
-    __ Branch(slow);
-  } else {
-    __ LoadRoot(result, Heap::kUndefinedValueRootIndex);
-    __ Branch(&done);
-  }
+  __ bind(&return_undefined);
+  __ LoadRoot(result, Heap::kUndefinedValueRootIndex);
+  __ Branch(&done);
 
   __ bind(&in_bounds);
   // Fast case: Do the load.
@@ -291,7 +285,7 @@
 
   // Dictionary load failed, go slow (but don't miss).
   __ bind(&slow);
-  GenerateSlow(masm);
+  GenerateRuntimeGetProperty(masm);
 }
 
 
@@ -326,16 +320,13 @@
 }
 
 
-void LoadIC::GenerateSlow(MacroAssembler* masm) {
+void LoadIC::GenerateRuntimeGetProperty(MacroAssembler* masm) {
   // The return address is in ra.
 
   __ mov(LoadIC_TempRegister(), LoadDescriptor::ReceiverRegister());
   __ Push(LoadIC_TempRegister(), LoadDescriptor::NameRegister());
 
-  ExternalReference ref =
-      ExternalReference(IC_Utility(kLoadIC_Slow), masm->isolate());
-  int arg_count = 2;
-  __ TailCallExternalReference(ref, arg_count, 1);
+  __ TailCallRuntime(Runtime::kGetProperty, 2, 1);
 }
 
 
@@ -358,20 +349,16 @@
 }
 
 
-void KeyedLoadIC::GenerateSlow(MacroAssembler* masm) {
+void KeyedLoadIC::GenerateRuntimeGetProperty(MacroAssembler* masm) {
   // The return address is in ra.
 
   __ Push(LoadDescriptor::ReceiverRegister(), LoadDescriptor::NameRegister());
 
-  ExternalReference ref =
-      ExternalReference(IC_Utility(kKeyedLoadIC_Slow), masm->isolate());
-  int arg_count = 2;
-  __ TailCallExternalReference(ref, arg_count, 1);
-}
-
-
-void KeyedLoadIC::GenerateMegamorphic(MacroAssembler* masm,
-                                      LanguageMode language_mode) {
+  __ TailCallRuntime(Runtime::kKeyedGetProperty, 2, 1);
+}
+
+
+void KeyedLoadIC::GenerateMegamorphic(MacroAssembler* masm) {
   // The return address is in ra.
   Label slow, check_name, index_smi, index_name, property_array_property;
   Label probe_dictionary, check_number_dictionary;
@@ -395,8 +382,7 @@
   // Check the receiver's map to see if it has fast elements.
   __ CheckFastElements(a0, a3, &check_number_dictionary);
 
-  GenerateFastArrayLoad(masm, receiver, key, a0, a3, t0, v0, &slow,
-                        language_mode);
+  GenerateFastArrayLoad(masm, receiver, key, a0, a3, t0, v0, &slow);
   __ IncrementCounter(isolate->counters()->keyed_load_generic_smi(), 1, t0, a3);
   __ Ret();
 
@@ -417,7 +403,7 @@
   __ bind(&slow);
   __ IncrementCounter(isolate->counters()->keyed_load_generic_slow(), 1, t0,
                       a3);
-  GenerateSlow(masm);
+  GenerateRuntimeGetProperty(masm);
 
   __ bind(&check_name);
   GenerateKeyNameCheck(masm, key, a0, a3, &index_name, &slow);