[builtins] Sanitize receiver patching for API functions.

src/arm/builtins-arm.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_ARM
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 1194 matching lines @@
 
 static void CompatibleReceiverCheck(MacroAssembler* masm, Register receiver,
                                     Register function_template_info,
                                     Register scratch0, Register scratch1,
                                     Register scratch2,
                                     Label* receiver_check_failed) {
   Register signature = scratch0;
   Register map = scratch1;
   Register constructor = scratch2;
 
-  // If the receiver is not an object, jump to receiver_check_failed.
-  __ CompareObjectType(receiver, map, ip, FIRST_JS_OBJECT_TYPE);
-  __ b(lo, receiver_check_failed);
-
   // If there is no signature, return the holder.
   __ ldr(signature, FieldMemOperand(function_template_info,
                                     FunctionTemplateInfo::kSignatureOffset));
   __ CompareRoot(signature, Heap::kUndefinedValueRootIndex);
   Label receiver_check_passed;
   __ b(eq, &receiver_check_passed);
 
   // Walk the prototype chain.
   Label prototype_loop_start;
   __ bind(&prototype_loop_start);
@@ skipping 48 matching lines @@
   // ----------- S t a t e -------------
   //  -- r0                 : number of arguments excluding receiver
   //  -- r1                 : callee
   //  -- lr                 : return address
   //  -- sp[0]              : last argument
   //  -- ...
   //  -- sp[4 * (argc - 1)] : first argument
   //  -- sp[4 * argc]       : receiver
   // -----------------------------------
 
-  // Load the receiver.
-  __ ldr(r2, MemOperand(sp, r0, LSL, kPointerSizeLog2));
-
-  // Update the receiver if this is a contextual call.
-  Label set_global_proxy, valid_receiver;
-  __ CompareRoot(r2, Heap::kUndefinedValueRootIndex);
-  __ b(eq, &set_global_proxy);
-  __ bind(&valid_receiver);
-
   // Load the FunctionTemplateInfo.
   __ ldr(r3, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
   __ ldr(r3, FieldMemOperand(r3, SharedFunctionInfo::kFunctionDataOffset));
 
   // Do the compatible receiver check.
   Label receiver_check_failed;
+  __ ldr(r2, MemOperand(sp, r0, LSL, kPointerSizeLog2));
   CompatibleReceiverCheck(masm, r2, r3, r4, r5, r6, &receiver_check_failed);
 
   // Get the callback offset from the FunctionTemplateInfo, and jump to the
   // beginning of the code.
   __ ldr(r4, FieldMemOperand(r3, FunctionTemplateInfo::kCallCodeOffset));
   __ ldr(r4, FieldMemOperand(r4, CallHandlerInfo::kFastHandlerOffset));
   __ add(r4, r4, Operand(Code::kHeaderSize - kHeapObjectTag));
   __ Jump(r4);
 
-  __ bind(&set_global_proxy);
-  __ LoadGlobalProxy(r2);
-  __ str(r2, MemOperand(sp, r0, LSL, kPointerSizeLog2));
-  __ b(&valid_receiver);
-
   // Compatible receiver check failed: throw an Illegal Invocation exception.
   __ bind(&receiver_check_failed);
   // Drop the arguments (including the receiver)
   __ add(r0, r0, Operand(1));
   __ add(sp, sp, Operand(r0, LSL, kPointerSizeLog2));
   __ TailCallRuntime(Runtime::kThrowIllegalInvocation);
 }
 
 
 void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) {
@@ skipping 1035 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM