Unify the way cctest initalizes the VM for each test case.

test/cctest/test-disasm-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 22 matching lines @@
 #include "debug.h"
 #include "disasm.h"
 #include "disassembler.h"
 #include "macro-assembler.h"
 #include "serialize.h"
 #include "cctest.h"
 
 using namespace v8::internal;
 
 
-static v8::Persistent<v8::Context> env;
-
-static void InitializeVM() {
-  // Disable compilation of natives.
-  FLAG_disable_native_files = true;
-  if (env.IsEmpty()) {
-    env = v8::Context::New();
-  }
-}
-
-
 bool DisassembleAndCompare(byte* pc, const char* compare_string) {
   disasm::NameConverter converter;
   disasm::Disassembler disasm(converter);
   EmbeddedVector<char, 128> disasm_buffer;
 
   disasm.InstructionDecode(disasm_buffer, pc);
 
   if (strcmp(compare_string, disasm_buffer.start()) != 0) {
     fprintf(stderr,
             "expected: \n"
             "%s\n"
             "disassembled: \n"
             "%s\n\n",
             compare_string, disasm_buffer.start());
     return false;
   }
   return true;
 }
 
 
 // Set up V8 to a state where we can at least run the assembler and
 // disassembler. Declare the variables and allocate the data structures used
 // in the rest of the macros.
 #define SET_UP()                                          \
-  InitializeVM();                                         \
+  CcTest::InitializeVM();                                 \
   Isolate* isolate = Isolate::Current();                  \
   HandleScope scope(isolate);                             \
   byte *buffer = reinterpret_cast<byte*>(malloc(4*1024)); \
   Assembler assm(isolate, buffer, 4*1024);                \
   bool failure = false;
 
 
 // This macro assembles one instruction using the preallocated assembler and
 // disassembles the generated instruction, comparing the output to the expected
 // value. If the comparison fails an error message is printed, but the test
@@ skipping 344 matching lines @@
     COMPARE(ext_(a0, a1, 31, 1),
             "7ca407c0       ext     a0, a1, 31, 1");
     COMPARE(ext_(s6, s7, 30, 2),
             "7ef60f80       ext     s6, s7, 30, 2");
     COMPARE(ext_(v0, v1, 0, 32),
             "7c62f800       ext     v0, v1, 0, 32");
   }
 
   VERIFY_RUN();
 }