Move platform abstraction to base library

src/arm64/codegen-arm64.cc

 // Copyright 2013 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 "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/arm64/simulator-arm64.h"
 #include "src/codegen.h"
@@ skipping 17 matching lines @@
 #endif
 
 
 UnaryMathFunction CreateExpFunction() {
   if (!FLAG_fast_math) return &std::exp;
 
   // Use the Math.exp implemetation in MathExpGenerator::EmitMathExp() to create
   // an AAPCS64-compliant exp() function. This will be faster than the C
   // library's exp() function, but probably less accurate.
   size_t actual_size;
-  byte* buffer = static_cast<byte*>(OS::Allocate(1 * KB, &actual_size, true));
+  byte* buffer =
+      static_cast<byte*>(base::OS::Allocate(1 * KB, &actual_size, true));
   if (buffer == NULL) return &std::exp;
 
   ExternalReference::InitializeMathExpData();
   MacroAssembler masm(NULL, buffer, static_cast<int>(actual_size));
   masm.SetStackPointer(csp);
 
   // The argument will be in d0 on entry.
   DoubleRegister input = d0;
   // Use other caller-saved registers for all other values.
   DoubleRegister result = d1;
   DoubleRegister double_temp1 = d2;
   DoubleRegister double_temp2 = d3;
   Register temp1 = x10;
   Register temp2 = x11;
   Register temp3 = x12;
 
   MathExpGenerator::EmitMathExp(&masm, input, result,
                                 double_temp1, double_temp2,
                                 temp1, temp2, temp3);
   // Move the result to the return register.
   masm.Fmov(d0, result);
   masm.Ret();
 
   CodeDesc desc;
   masm.GetCode(&desc);
   ASSERT(!RelocInfo::RequiresRelocation(desc));
 
-  CPU::FlushICache(buffer, actual_size);
-  OS::ProtectCode(buffer, actual_size);
+  CpuFeatures::FlushICache(buffer, actual_size);
+  base::OS::ProtectCode(buffer, actual_size);
 
 #if !defined(USE_SIMULATOR)
   return FUNCTION_CAST<UnaryMathFunction>(buffer);
 #else
   fast_exp_arm64_machine_code = buffer;
   return &fast_exp_simulator;
 #endif
 }
 
 
@@ skipping 533 matching lines @@
   __ Fmul(result, double_temp3, double_temp1);
 
   __ Bind(&done);
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64