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

src/s390/macro-assembler-s390.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.
 
 #include <assert.h>  // For assert
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_S390
 
 #include "src/base/bits.h"
@@ skipping 1484 matching lines @@
   STATIC_ASSERT(StackHandlerConstants::kSize == 1 * kPointerSize);
   STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
 
   // Pop the Next Handler into r3 and store it into Handler Address reference.
   Pop(r3);
   mov(ip, Operand(ExternalReference(Isolate::kHandlerAddress, isolate())));
 
   StoreP(r3, 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));
-  LoadRR(ip, fp);
-  bind(&load_context);
-  LoadP(scratch,
-        MemOperand(ip, CommonFrameConstants::kContextOrFrameTypeOffset));
-  JumpIfNotSmi(scratch, &has_context);
-  LoadP(ip, MemOperand(ip, CommonFrameConstants::kCallerFPOffset));
-  b(&load_context);
-  bind(&has_context);
-
-// In debug mode, make sure the lexical context is set.
-#ifdef DEBUG
-  CmpP(scratch, Operand::Zero());
-  Check(ne, kWeShouldNotHaveAnEmptyLexicalContext);
-#endif
-
-  // Load the native context of the current context.
-  LoadP(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.
-    LoadP(holder_reg, FieldMemOperand(scratch, HeapObject::kMapOffset));
-    CompareRoot(holder_reg, Heap::kNativeContextMapRootIndex);
-    Check(eq, kJSGlobalObjectNativeContextShouldBeANativeContext);
-    pop(holder_reg);  // Restore holder.
-  }
-
-  // Check if both contexts are the same.
-  LoadP(ip, FieldMemOperand(holder_reg, JSGlobalProxy::kNativeContextOffset));
-  CmpP(scratch, ip);
-  beq(&same_contexts, Label::kNear);
-
-  // Check the context is a native context.
-  if (emit_debug_code()) {
-    // TODO(119): avoid push(holder_reg)/pop(holder_reg)
-    // 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.
-    LoadRR(holder_reg, ip);  // Move ip to its holding place.
-    CompareRoot(holder_reg, Heap::kNullValueRootIndex);
-    Check(ne, kJSGlobalProxyContextShouldNotBeNull);
-
-    LoadP(holder_reg, FieldMemOperand(holder_reg, HeapObject::kMapOffset));
-    CompareRoot(holder_reg, Heap::kNativeContextMapRootIndex);
-    Check(eq, kJSGlobalObjectNativeContextShouldBeANativeContext);
-    // Restore ip is not needed. ip is reloaded below.
-    pop(holder_reg);  // Restore holder.
-    // Restore ip to holder's context.
-    LoadP(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;
-
-  LoadP(scratch, FieldMemOperand(scratch, token_offset));
-  LoadP(ip, FieldMemOperand(ip, token_offset));
-  CmpP(scratch, ip);
-  bne(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.
   XorP(t0, scratch);
@@ skipping 3791 matching lines @@
   }
   if (mag.shift > 0) ShiftRightArith(result, result, Operand(mag.shift));
   ExtractBit(r0, dividend, 31);
   AddP(result, r0);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_S390