PPC: [builtins] Sanitize receiver patching for API functions.

src/ppc/builtins-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/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 1193 matching lines @@
 
 // Clobbers registers {r7, r8, r9, r10}.
 void CompatibleReceiverCheck(MacroAssembler* masm, Register receiver,
                              Register function_template_info,
                              Label* receiver_check_failed) {
   Register signature = r7;
   Register map = r8;
   Register constructor = r9;
   Register scratch = r10;
 
-  __ CompareObjectType(receiver, map, no_reg, FIRST_JS_OBJECT_TYPE);
-  __ blt(receiver_check_failed);
-
   // If there is no signature, return the holder.
   __ LoadP(signature, FieldMemOperand(function_template_info,
                                       FunctionTemplateInfo::kSignatureOffset));
   Label receiver_check_passed;
   __ JumpIfRoot(signature, Heap::kUndefinedValueRootIndex,
                 &receiver_check_passed);
 
   // Walk the prototype chain.
   Label prototype_loop_start;
   __ bind(&prototype_loop_start);
@@ skipping 49 matching lines @@
   // ----------- S t a t e -------------
   //  -- r3                 : number of arguments excluding receiver
   //  -- r4                 : callee
   //  -- lr                 : return address
   //  -- sp[0]              : last argument
   //  -- ...
   //  -- sp[4 * (argc - 1)] : first argument
   //  -- sp[4 * argc]       : receiver
   // -----------------------------------
 
-  // Load the receiver.
-  __ ShiftLeftImm(r11, r3, Operand(kPointerSizeLog2));
-  __ LoadPX(r5, MemOperand(sp, r11));
-
-  // Update the receiver if this is a contextual call.
-  Label set_global_proxy, valid_receiver;
-  __ JumpIfRoot(r5, Heap::kUndefinedValueRootIndex, &set_global_proxy);
 
   // Load the FunctionTemplateInfo.
-  __ bind(&valid_receiver);
   __ LoadP(r6, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
   __ LoadP(r6, FieldMemOperand(r6, SharedFunctionInfo::kFunctionDataOffset));
 
   // Do the compatible receiver check.
   Label receiver_check_failed;
+  __ ShiftLeftImm(r11, r3, Operand(kPointerSizeLog2));
+  __ LoadPX(r5, MemOperand(sp, r11));
   CompatibleReceiverCheck(masm, r5, r6, &receiver_check_failed);
 
   // Get the callback offset from the FunctionTemplateInfo, and jump to the
   // beginning of the code.
   __ LoadP(r7, FieldMemOperand(r6, FunctionTemplateInfo::kCallCodeOffset));
   __ LoadP(r7, FieldMemOperand(r7, CallHandlerInfo::kFastHandlerOffset));
   __ addi(ip, r7, Operand(Code::kHeaderSize - kHeapObjectTag));
   __ JumpToJSEntry(ip);
 
-  __ bind(&set_global_proxy);
-  __ LoadGlobalProxy(r5);
-  __ StorePX(r5, MemOperand(sp, r11));
-  __ b(&valid_receiver);
-
   // Compatible receiver check failed: throw an Illegal Invocation exception.
   __ bind(&receiver_check_failed);
   // Drop the arguments (including the receiver);
   __ addi(r11, r11, Operand(kPointerSize));
   __ add(sp, sp, r11);
   __ TailCallRuntime(Runtime::kThrowIllegalInvocation);
 }
 
 
 void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) {
@@ skipping 1097 matching lines @@
     __ bkpt(0);
   }
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC