[ic] Remove unnecessary access rights checks from the IC handlers.

src/arm/macro-assembler-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.
 
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_ARM
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 1812 matching lines @@
 
 void MacroAssembler::PopStackHandler() {
   STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
   pop(r1);
   mov(ip, Operand(ExternalReference(Isolate::kHandlerAddress, isolate())));
   add(sp, sp, Operand(StackHandlerConstants::kSize - kPointerSize));
   str(r1, MemOperand(ip));
 }
 
 
-void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg,
-                                            Register scratch,
-                                            Label* miss) {
-  Label same_contexts;
-
-  DCHECK(!holder_reg.is(scratch));
-  DCHECK(!holder_reg.is(ip));
-  DCHECK(!scratch.is(ip));
-
-  // Load current lexical context from the active StandardFrame, which
-  // may require crawling past STUB frames.
-  Label load_context;
-  Label has_context;
-  DCHECK(!ip.is(scratch));
-  mov(ip, fp);
-  bind(&load_context);
-  ldr(scratch, MemOperand(ip, CommonFrameConstants::kContextOrFrameTypeOffset));
-  JumpIfNotSmi(scratch, &has_context);
-  ldr(ip, MemOperand(ip, CommonFrameConstants::kCallerFPOffset));
-  b(&load_context);
-  bind(&has_context);
-
-  // In debug mode, make sure the lexical context is set.
-#ifdef DEBUG
-  cmp(scratch, Operand::Zero());
-  Check(ne, kWeShouldNotHaveAnEmptyLexicalContext);
-#endif
-
-  // Load the native context of the current context.
-  ldr(scratch, ContextMemOperand(scratch, Context::NATIVE_CONTEXT_INDEX));
-
-  // Check the context is a native context.
-  if (emit_debug_code()) {
-    // Cannot use ip as a temporary in this verification code. Due to the fact
-    // that ip is clobbered as part of cmp with an object Operand.
-    push(holder_reg);  // Temporarily save holder on the stack.
-    // Read the first word and compare to the native_context_map.
-    ldr(holder_reg, FieldMemOperand(scratch, HeapObject::kMapOffset));
-    LoadRoot(ip, Heap::kNativeContextMapRootIndex);
-    cmp(holder_reg, ip);
-    Check(eq, kJSGlobalObjectNativeContextShouldBeANativeContext);
-    pop(holder_reg);  // Restore holder.
-  }
-
-  // Check if both contexts are the same.
-  ldr(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kNativeContextOffset));
-  cmp(scratch, Operand(ip));
-  b(eq, &same_contexts);
-
-  // Check the context is a native context.
-  if (emit_debug_code()) {
-    // Cannot use ip as a temporary in this verification code. Due to the fact
-    // that ip is clobbered as part of cmp with an object Operand.
-    push(holder_reg);  // Temporarily save holder on the stack.
-    mov(holder_reg, ip);  // Move ip to its holding place.
-    LoadRoot(ip, Heap::kNullValueRootIndex);
-    cmp(holder_reg, ip);
-    Check(ne, kJSGlobalProxyContextShouldNotBeNull);
-
-    ldr(holder_reg, FieldMemOperand(holder_reg, HeapObject::kMapOffset));
-    LoadRoot(ip, Heap::kNativeContextMapRootIndex);
-    cmp(holder_reg, ip);
-    Check(eq, kJSGlobalObjectNativeContextShouldBeANativeContext);
-    // Restore ip is not needed. ip is reloaded below.
-    pop(holder_reg);  // Restore holder.
-    // Restore ip to holder's context.
-    ldr(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kNativeContextOffset));
-  }
-
-  // Check that the security token in the calling global object is
-  // compatible with the security token in the receiving global
-  // object.
-  int token_offset = Context::kHeaderSize +
-                     Context::SECURITY_TOKEN_INDEX * kPointerSize;
-
-  ldr(scratch, FieldMemOperand(scratch, token_offset));
-  ldr(ip, FieldMemOperand(ip, token_offset));
-  cmp(scratch, Operand(ip));
-  b(ne, miss);
-
-  bind(&same_contexts);
-}
-
-
 // Compute the hash code from the untagged key.  This must be kept in sync with
 // ComputeIntegerHash in utils.h and KeyedLoadGenericStub in
 // code-stub-hydrogen.cc
 void MacroAssembler::GetNumberHash(Register t0, Register scratch) {
   // First of all we assign the hash seed to scratch.
   LoadRoot(scratch, Heap::kHashSeedRootIndex);
   SmiUntag(scratch);
 
   // Xor original key with a seed.
   eor(t0, t0, Operand(scratch));
@@ skipping 2154 matching lines @@
     }
   }
   if (mag.shift > 0) mov(result, Operand(result, ASR, mag.shift));
   add(result, result, Operand(dividend, LSR, 31));
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM