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

src/ia32/macro-assembler-ia32.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_IA32
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 1264 matching lines @@
 
 
 void MacroAssembler::PopStackHandler() {
   STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
   ExternalReference handler_address(Isolate::kHandlerAddress, isolate());
   pop(Operand::StaticVariable(handler_address));
   add(esp, Immediate(StackHandlerConstants::kSize - kPointerSize));
 }
 
 
-void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg,
-                                            Register scratch1,
-                                            Register scratch2,
-                                            Label* miss) {
-  Label same_contexts;
-
-  DCHECK(!holder_reg.is(scratch1));
-  DCHECK(!holder_reg.is(scratch2));
-  DCHECK(!scratch1.is(scratch2));
-
-  // Load current lexical context from the active StandardFrame, which
-  // may require crawling past STUB frames.
-  Label load_context;
-  Label has_context;
-  mov(scratch2, ebp);
-  bind(&load_context);
-  mov(scratch1,
-      MemOperand(scratch2, CommonFrameConstants::kContextOrFrameTypeOffset));
-  JumpIfNotSmi(scratch1, &has_context);
-  mov(scratch2, MemOperand(scratch2, CommonFrameConstants::kCallerFPOffset));
-  jmp(&load_context);
-  bind(&has_context);
-
-  // When generating debug code, make sure the lexical context is set.
-  if (emit_debug_code()) {
-    cmp(scratch1, Immediate(0));
-    Check(not_equal, kWeShouldNotHaveAnEmptyLexicalContext);
-  }
-  // Load the native context of the current context.
-  mov(scratch1, ContextOperand(scratch1, Context::NATIVE_CONTEXT_INDEX));
-
-  // Check the context is a native context.
-  if (emit_debug_code()) {
-    // Read the first word and compare to native_context_map.
-    cmp(FieldOperand(scratch1, HeapObject::kMapOffset),
-        isolate()->factory()->native_context_map());
-    Check(equal, kJSGlobalObjectNativeContextShouldBeANativeContext);
-  }
-
-  // Check if both contexts are the same.
-  cmp(scratch1, FieldOperand(holder_reg, JSGlobalProxy::kNativeContextOffset));
-  j(equal, &same_contexts);
-
-  // Compare security tokens, save holder_reg on the stack so we can use it
-  // as a temporary register.
-  //
-  // Check that the security token in the calling global object is
-  // compatible with the security token in the receiving global
-  // object.
-  mov(scratch2,
-      FieldOperand(holder_reg, JSGlobalProxy::kNativeContextOffset));
-
-  // Check the context is a native context.
-  if (emit_debug_code()) {
-    cmp(scratch2, isolate()->factory()->null_value());
-    Check(not_equal, kJSGlobalProxyContextShouldNotBeNull);
-
-    // Read the first word and compare to native_context_map(),
-    cmp(FieldOperand(scratch2, HeapObject::kMapOffset),
-        isolate()->factory()->native_context_map());
-    Check(equal, kJSGlobalObjectNativeContextShouldBeANativeContext);
-  }
-
-  int token_offset = Context::kHeaderSize +
-                     Context::SECURITY_TOKEN_INDEX * kPointerSize;
-  mov(scratch1, FieldOperand(scratch1, token_offset));
-  cmp(scratch1, FieldOperand(scratch2, token_offset));
-  j(not_equal, 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
 //
 // Note: r0 will contain hash code
 void MacroAssembler::GetNumberHash(Register r0, Register scratch) {
   // Xor original key with a seed.
   if (serializer_enabled()) {
     ExternalReference roots_array_start =
         ExternalReference::roots_array_start(isolate());
@@ skipping 1917 matching lines @@
   mov(eax, dividend);
   shr(eax, 31);
   add(edx, eax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32