[compiler] Sanitize entry points to LookupSlot access.

src/full-codegen/mips/full-codegen-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
 
 // Note on Mips implementation:
 //
 // The result_register() for mips is the 'v0' register, which is defined
 // by the ABI to contain function return values. However, the first
@@ skipping 1412 matching lines @@
       break;
     }
 
     case VariableLocation::LOOKUP: {
       Comment cmnt(masm_, "[ Lookup variable");
       Label done, slow;
       // Generate code for loading from variables potentially shadowed
       // by eval-introduced variables.
       EmitDynamicLookupFastCase(proxy, typeof_mode, &slow, &done);
       __ bind(&slow);
-      __ li(a1, Operand(var->name()));
-      __ Push(cp, a1);  // Context and name.
+      __ Push(var->name());
       Runtime::FunctionId function_id =
           typeof_mode == NOT_INSIDE_TYPEOF
               ? Runtime::kLoadLookupSlot
-              : Runtime::kLoadLookupSlotNoReferenceError;
+              : Runtime::kLoadLookupSlotInsideTypeof;
       __ CallRuntime(function_id);
       __ bind(&done);
       context()->Plug(v0);
     }
   }
 }
 
 
 void FullCodeGenerator::VisitRegExpLiteral(RegExpLiteral* expr) {
   Comment cmnt(masm_, "[ RegExpLiteral");
@@ skipping 985 matching lines @@
     __ li(a0, Operand(var->name()));
     __ Push(a0);
     __ CallRuntime(Runtime::kThrowReferenceError);
     __ bind(&uninitialized_this);
     EmitStoreToStackLocalOrContextSlot(var, location);
 
   } else if (!var->is_const_mode() ||
              (var->mode() == CONST && op == Token::INIT)) {
     if (var->IsLookupSlot()) {
       // Assignment to var.
-      __ li(a1, Operand(var->name()));
-      __ li(a0, Operand(Smi::FromInt(language_mode())));
-      __ Push(v0, cp, a1, a0);  // Value, context, name, language mode.
-      __ CallRuntime(Runtime::kStoreLookupSlot);
+      __ Push(var->name());
+      __ Push(v0);
+      __ CallRuntime(is_strict(language_mode())
+                         ? Runtime::kStoreLookupSlot_Strict
+                         : Runtime::kStoreLookupSlot_Sloppy);
     } else {
       // Assignment to var or initializing assignment to let/const in harmony
       // mode.
       DCHECK((var->IsStackAllocated() || var->IsContextSlot()));
       MemOperand location = VarOperand(var, a1);
       if (generate_debug_code_ && var->mode() == LET && op == Token::INIT) {
         // Check for an uninitialized let binding.
         __ lw(a2, location);
         __ LoadRoot(t0, Heap::kTheHoleValueRootIndex);
         __ Check(eq, kLetBindingReInitialization, a2, Operand(t0));
@@ skipping 329 matching lines @@
     Label slow, done;
 
     SetExpressionPosition(callee);
     // Generate code for loading from variables potentially shadowed by
     // eval-introduced variables.
     EmitDynamicLookupFastCase(callee, NOT_INSIDE_TYPEOF, &slow, &done);
 
     __ bind(&slow);
     // Call the runtime to find the function to call (returned in v0)
     // and the object holding it (returned in v1).
-    DCHECK(!context_register().is(a2));
-    __ li(a2, Operand(callee->name()));
-    __ Push(context_register(), a2);
-    __ CallRuntime(Runtime::kLoadLookupSlot);
+    __ Push(callee->name());
+    __ CallRuntime(Runtime::kLoadLookupSlotForCall);
     __ Push(v0, v1);  // Function, receiver.
     PrepareForBailoutForId(expr->LookupId(), NO_REGISTERS);
 
     // If fast case code has been generated, emit code to push the
     // function and receiver and have the slow path jump around this
     // code.
     if (done.is_linked()) {
       Label call;
       __ Branch(&call);
       __ bind(&done);
@@ skipping 1111 matching lines @@
           __ Push(a2, a1);
           __ CallRuntime(Runtime::kDeleteProperty_Sloppy);
           context()->Plug(v0);
         } else if (var->IsStackAllocated() || var->IsContextSlot()) {
           // Result of deleting non-global, non-dynamic variables is false.
           // The subexpression does not have side effects.
           context()->Plug(is_this);
         } else {
           // Non-global variable.  Call the runtime to try to delete from the
           // context where the variable was introduced.
-          DCHECK(!context_register().is(a2));
-          __ li(a2, Operand(var->name()));
-          __ Push(context_register(), a2);
+          __ Push(var->name());
           __ CallRuntime(Runtime::kDeleteLookupSlot);
           context()->Plug(v0);
         }
       } else {
         // Result of deleting non-property, non-variable reference is true.
         // The subexpression may have side effects.
         VisitForEffect(expr->expression());
         context()->Plug(true);
       }
       break;
@@ skipping 693 matching lines @@
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OsrAfterStackCheck()->entry()));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS