PPC: [runtime] Replace global object link with native context link in all contexts.

src/ppc/macro-assembler-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.
 
 #include <assert.h>  // For assert
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/base/bits.h"
@@ skipping 1284 matching lines @@
 
   // Load current lexical context from the stack frame.
   LoadP(scratch, MemOperand(fp, StandardFrameConstants::kContextOffset));
 // In debug mode, make sure the lexical context is set.
 #ifdef DEBUG
   cmpi(scratch, Operand::Zero());
   Check(ne, kWeShouldNotHaveAnEmptyLexicalContext);
 #endif
 
   // Load the native context of the current context.
-  int offset =
-      Context::kHeaderSize + Context::GLOBAL_OBJECT_INDEX * kPointerSize;
-  LoadP(scratch, FieldMemOperand(scratch, offset));
-  LoadP(scratch,
-        FieldMemOperand(scratch, JSGlobalObject::kNativeContextOffset));
+  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));
     LoadRoot(ip, Heap::kNativeContextMapRootIndex);
     cmp(holder_reg, ip);
@@ skipping 1020 matching lines @@
   CEntryStub stub(isolate(), 1);
   Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
 }
 
 
 void MacroAssembler::InvokeBuiltin(int native_context_index, InvokeFlag flag,
                                    const CallWrapper& call_wrapper) {
   // You can't call a builtin without a valid frame.
   DCHECK(flag == JUMP_FUNCTION || has_frame());
 
-  GetBuiltinEntry(ip, native_context_index);
+  LoadNativeContextSlot(native_context_index, r4);
+  LoadP(ip, FieldMemOperand(r4, JSFunction::kCodeEntryOffset));
   if (flag == CALL_FUNCTION) {
     call_wrapper.BeforeCall(CallSize(ip));
     CallJSEntry(ip);
     call_wrapper.AfterCall();
   } else {
     DCHECK(flag == JUMP_FUNCTION);
     JumpToJSEntry(ip);
   }
 }
 
 
-void MacroAssembler::GetBuiltinFunction(Register target,
-                                        int native_context_index) {
-  // Load the builtins object into target register.
-  LoadP(target,
-        MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
-  LoadP(target, FieldMemOperand(target, JSGlobalObject::kNativeContextOffset));
-  // Load the JavaScript builtin function from the builtins object.
-  LoadP(target, ContextOperand(target, native_context_index), r0);
-}
-
-
-void MacroAssembler::GetBuiltinEntry(Register target,
-                                     int native_context_index) {
-  DCHECK(!target.is(r4));
-  GetBuiltinFunction(r4, native_context_index);
-  // Load the code entry point from the builtins object.
-  LoadP(target, FieldMemOperand(r4, JSFunction::kCodeEntryOffset));
-}
-
-
 void MacroAssembler::SetCounter(StatsCounter* counter, int value,
                                 Register scratch1, Register scratch2) {
   if (FLAG_native_code_counters && counter->Enabled()) {
     mov(scratch1, Operand(value));
     mov(scratch2, Operand(ExternalReference(counter)));
     stw(scratch1, MemOperand(scratch2));
   }
 }
 
 
@@ skipping 98 matching lines @@
     }
   } else {
     // Slot is in the current function context.  Move it into the
     // destination register in case we store into it (the write barrier
     // cannot be allowed to destroy the context in esi).
     mr(dst, cp);
   }
 }
 
 
-void MacroAssembler::LoadGlobalProxy(Register dst) {
-  LoadP(dst, GlobalObjectOperand());
-  LoadP(dst, FieldMemOperand(dst, JSGlobalObject::kGlobalProxyOffset));
-}
-
-
 void MacroAssembler::LoadTransitionedArrayMapConditional(
     ElementsKind expected_kind, ElementsKind transitioned_kind,
     Register map_in_out, Register scratch, Label* no_map_match) {
-  // Load the global or builtins object from the current context.
-  LoadP(scratch,
-        MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
-  LoadP(scratch,
-        FieldMemOperand(scratch, JSGlobalObject::kNativeContextOffset));
-
   // Check that the function's map is the same as the expected cached map.
-  LoadP(scratch,
-        MemOperand(scratch, Context::SlotOffset(Context::JS_ARRAY_MAPS_INDEX)));
+  LoadNativeContextSlot(Context::JS_ARRAY_MAPS_INDEX, scratch);
   size_t offset = expected_kind * kPointerSize + FixedArrayBase::kHeaderSize;
   LoadP(ip, FieldMemOperand(scratch, offset));
   cmp(map_in_out, ip);
   bne(no_map_match);
 
   // Use the transitioned cached map.
   offset = transitioned_kind * kPointerSize + FixedArrayBase::kHeaderSize;
   LoadP(map_in_out, FieldMemOperand(scratch, offset));
 }
 
 
-void MacroAssembler::LoadGlobalFunction(int index, Register function) {
-  // Load the global or builtins object from the current context.
-  LoadP(function,
-        MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
-  // Load the native context from the global or builtins object.
-  LoadP(function,
-        FieldMemOperand(function, JSGlobalObject::kNativeContextOffset));
-  // Load the function from the native context.
-  LoadP(function, MemOperand(function, Context::SlotOffset(index)), r0);
+void MacroAssembler::LoadNativeContextSlot(int index, Register dst) {
+  LoadP(dst, NativeContextMemOperand());
+  LoadP(dst, ContextMemOperand(dst, index));
 }
 
 
 void MacroAssembler::LoadGlobalFunctionInitialMap(Register function,
                                                   Register map,
                                                   Register scratch) {
   // Load the initial map. The global functions all have initial maps.
   LoadP(map,
         FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
   if (emit_debug_code()) {
@@ skipping 1903 matching lines @@
   }
   if (mag.shift > 0) srawi(result, result, mag.shift);
   ExtractBit(r0, dividend, 31);
   add(result, result, r0);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC