[compiler] Sanitize entry points to LookupSlot access.

src/full-codegen/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.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 1375 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);
-      __ mov(r4, Operand(var->name()));
-      __ Push(cp, r4);  // 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(r3);
     }
   }
 }
 
 
 void FullCodeGenerator::VisitRegExpLiteral(RegExpLiteral* expr) {
   Comment cmnt(masm_, "[ RegExpLiteral");
@@ skipping 1031 matching lines @@
     __ mov(r4, Operand(var->name()));
     __ push(r4);
     __ 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.
-      __ push(r3);  // Value.
-      __ mov(r4, Operand(var->name()));
-      __ mov(r3, Operand(Smi::FromInt(language_mode())));
-      __ Push(cp, r4, r3);  // Context, name, language mode.
-      __ CallRuntime(Runtime::kStoreLookupSlot);
+      __ Push(var->name());
+      __ Push(r3);
+      __ 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, r4);
       if (generate_debug_code_ && var->mode() == LET && op == Token::INIT) {
         // Check for an uninitialized let binding.
         __ LoadP(r5, location);
         __ CompareRoot(r5, Heap::kTheHoleValueRootIndex);
         __ Check(eq, kLetBindingReInitialization);
@@ skipping 319 matching lines @@
   if (callee->var()->IsLookupSlot()) {
     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 r3) and
     // the object holding it (returned in r4).
-    DCHECK(!context_register().is(r5));
-    __ mov(r5, Operand(callee->name()));
-    __ Push(context_register(), r5);
-    __ CallRuntime(Runtime::kLoadLookupSlot);
+    __ Push(callee->name());
+    __ CallRuntime(Runtime::kLoadLookupSlotForCall);
     __ Push(r3, r4);  // 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;
       __ b(&call);
       __ bind(&done);
       // Push function.
@@ skipping 1112 matching lines @@
           __ Push(r5, r4);
           __ CallRuntime(Runtime::kDeleteProperty_Sloppy);
           context()->Plug(r3);
         } 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(r5));
-          __ mov(r5, Operand(var->name()));
-          __ Push(context_register(), r5);
+          __ Push(var->name());
           __ CallRuntime(Runtime::kDeleteLookupSlot);
           context()->Plug(r3);
         }
       } 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 677 matching lines @@
     return ON_STACK_REPLACEMENT;
   }
 
   DCHECK(interrupt_address ==
          isolate->builtins()->OsrAfterStackCheck()->entry());
   return OSR_AFTER_STACK_CHECK;
 }
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_TARGET_ARCH_PPC