v8/test/cctest/test-disasm-x64.cc

// Copyright 2011 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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//       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
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#include <stdlib.h>

#include "src/v8.h"

#include "src/debug.h"
#include "src/disasm.h"
#include "src/disassembler.h"
#include "src/ic/ic.h"
#include "src/macro-assembler.h"
#include "src/serialize.h"
#include "test/cctest/cctest.h"

using namespace v8::internal;


#define __ assm.


static void DummyStaticFunction(Object* result) {
}


TEST(DisasmX64) {
  CcTest::InitializeVM();
  Isolate* isolate = CcTest::i_isolate();
  HandleScope scope(isolate);
  v8::internal::byte buffer[4096];
  Assembler assm(isolate, buffer, sizeof buffer);
  DummyStaticFunction(NULL);  // just bloody use it (DELETE; debugging)

  // Short immediate instructions
  __ addq(rax, Immediate(12345678));
  __ orq(rax, Immediate(12345678));
  __ subq(rax, Immediate(12345678));
  __ xorq(rax, Immediate(12345678));
  __ andq(rax, Immediate(12345678));

  // ---- This one caused crash
  __ movq(rbx,  Operand(rsp, rcx, times_2, 0));  // [rsp+rcx*4]

  // ---- All instructions that I can think of
  __ addq(rdx, rbx);
  __ addq(rdx, Operand(rbx, 0));
  __ addq(rdx, Operand(rbx, 16));
  __ addq(rdx, Operand(rbx, 1999));
  __ addq(rdx, Operand(rbx, -4));
  __ addq(rdx, Operand(rbx, -1999));
  __ addq(rdx, Operand(rsp, 0));
  __ addq(rdx, Operand(rsp, 16));
  __ addq(rdx, Operand(rsp, 1999));
  __ addq(rdx, Operand(rsp, -4));
  __ addq(rdx, Operand(rsp, -1999));
  __ nop();
  __ addq(rsi, Operand(rcx, times_4, 0));
  __ addq(rsi, Operand(rcx, times_4, 24));
  __ addq(rsi, Operand(rcx, times_4, -4));
  __ addq(rsi, Operand(rcx, times_4, -1999));
  __ nop();
  __ addq(rdi, Operand(rbp, rcx, times_4, 0));
  __ addq(rdi, Operand(rbp, rcx, times_4, 12));
  __ addq(rdi, Operand(rbp, rcx, times_4, -8));
  __ addq(rdi, Operand(rbp, rcx, times_4, -3999));
  __ addq(Operand(rbp, rcx, times_4, 12), Immediate(12));

  __ nop();
  __ addq(rbx, Immediate(12));
  __ nop();
  __ nop();
  __ andq(rdx, Immediate(3));
  __ andq(rdx, Operand(rsp, 4));
  __ cmpq(rdx, Immediate(3));
  __ cmpq(rdx, Operand(rsp, 4));
  __ cmpq(Operand(rbp, rcx, times_4, 0), Immediate(1000));
  __ cmpb(rbx, Operand(rbp, rcx, times_2, 0));
  __ cmpb(Operand(rbp, rcx, times_2, 0), rbx);
  __ orq(rdx, Immediate(3));
  __ xorq(rdx, Immediate(3));
  __ nop();
  __ cpuid();
  __ movsxbl(rdx, Operand(rcx, 0));
  __ movsxbq(rdx, Operand(rcx, 0));
  __ movsxwl(rdx, Operand(rcx, 0));
  __ movsxwq(rdx, Operand(rcx, 0));
  __ movzxbl(rdx, Operand(rcx, 0));
  __ movzxwl(rdx, Operand(rcx, 0));
  __ movzxbq(rdx, Operand(rcx, 0));
  __ movzxwq(rdx, Operand(rcx, 0));

  __ nop();
  __ imulq(rdx, rcx);
  __ shld(rdx, rcx);
  __ shrd(rdx, rcx);
  __ shlq(Operand(rdi, rax, times_4, 100), Immediate(1));
  __ shlq(Operand(rdi, rax, times_4, 100), Immediate(6));
  __ shlq(Operand(r15, 0), Immediate(1));
  __ shlq(Operand(r15, 0), Immediate(6));
  __ shlq_cl(Operand(r15, 0));
  __ shlq_cl(Operand(r15, 0));
  __ shlq_cl(Operand(rdi, rax, times_4, 100));
  __ shlq_cl(Operand(rdi, rax, times_4, 100));
  __ shlq(rdx, Immediate(1));
  __ shlq(rdx, Immediate(6));
  __ shll(Operand(rdi, rax, times_4, 100), Immediate(1));
  __ shll(Operand(rdi, rax, times_4, 100), Immediate(6));
  __ shll(Operand(r15, 0), Immediate(1));
  __ shll(Operand(r15, 0), Immediate(6));
  __ shll_cl(Operand(r15, 0));
  __ shll_cl(Operand(r15, 0));
  __ shll_cl(Operand(rdi, rax, times_4, 100));
  __ shll_cl(Operand(rdi, rax, times_4, 100));
  __ shll(rdx, Immediate(1));
  __ shll(rdx, Immediate(6));
  __ bts(Operand(rdx, 0), rcx);
  __ bts(Operand(rbx, rcx, times_4, 0), rcx);
  __ nop();
  __ pushq(Immediate(12));
  __ pushq(Immediate(23456));
  __ pushq(rcx);
  __ pushq(rsi);
  __ pushq(Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
  __ pushq(Operand(rbx, rcx, times_4, 0));
  __ pushq(Operand(rbx, rcx, times_4, 0));
  __ pushq(Operand(rbx, rcx, times_4, 10000));
  __ popq(rdx);
  __ popq(rax);
  __ popq(Operand(rbx, rcx, times_4, 0));
  __ nop();

  __ addq(rdx, Operand(rsp, 16));
  __ addq(rdx, rcx);
  __ movb(rdx, Operand(rcx, 0));
  __ movb(rcx, Immediate(6));
  __ movb(Operand(rsp, 16), rdx);
  __ movw(Operand(rsp, 16), rdx);
  __ nop();
  __ movsxwq(rdx, Operand(rsp, 12));
  __ movsxbq(rdx, Operand(rsp, 12));
  __ movsxlq(rdx, Operand(rsp, 12));
  __ movzxwq(rdx, Operand(rsp, 12));
  __ movzxbq(rdx, Operand(rsp, 12));
  __ nop();
  __ movq(rdx, Immediate(1234567));
  __ movq(rdx, Operand(rsp, 12));
  __ movq(Operand(rbx, rcx, times_4, 10000), Immediate(12345));
  __ movq(Operand(rbx, rcx, times_4, 10000), rdx);
  __ nop();
  __ decb(rdx);
  __ decb(Operand(rax, 10));
  __ decb(Operand(rbx, rcx, times_4, 10000));
  __ decq(rdx);
  __ cdq();

  __ nop();
  __ idivq(rdx);
  __ mull(rdx);
  __ mulq(rdx);
  __ negq(rdx);
  __ notq(rdx);
  __ testq(Operand(rbx, rcx, times_4, 10000), rdx);

  __ imulq(rdx, rcx, Immediate(12));
  __ imulq(rdx, rcx, Immediate(1000));
  __ imulq(rdx, Operand(rbx, rcx, times_4, 10000));
  __ imulq(rdx, Operand(rbx, rcx, times_4, 10000), Immediate(12));
  __ imulq(rdx, Operand(rbx, rcx, times_4, 10000), Immediate(1000));
  __ imull(r15, rcx, Immediate(12));
  __ imull(r15, rcx, Immediate(1000));
  __ imull(r15, Operand(rbx, rcx, times_4, 10000));
  __ imull(r15, Operand(rbx, rcx, times_4, 10000), Immediate(12));
  __ imull(r15, Operand(rbx, rcx, times_4, 10000), Immediate(1000));

  __ incq(rdx);
  __ incq(Operand(rbx, rcx, times_4, 10000));
  __ pushq(Operand(rbx, rcx, times_4, 10000));
  __ popq(Operand(rbx, rcx, times_4, 10000));
  // TODO(mstarzinger): The following is protected.
  // __ jmp(Operand(rbx, rcx, times_4, 10000));

  __ leaq(rdx, Operand(rbx, rcx, times_4, 10000));
  __ orq(rdx, Immediate(12345));
  __ orq(rdx, Operand(rbx, rcx, times_4, 10000));

  __ nop();

  __ rclq(rdx, Immediate(1));
  __ rclq(rdx, Immediate(7));
  __ rcrq(rdx, Immediate(1));
  __ rcrq(rdx, Immediate(7));
  __ sarq(rdx, Immediate(1));
  __ sarq(rdx, Immediate(6));
  __ sarq_cl(rdx);
  __ sbbq(rdx, rbx);
  __ shld(rdx, rbx);
  __ shlq(rdx, Immediate(1));
  __ shlq(rdx, Immediate(6));
  __ shlq_cl(rdx);
  __ shrd(rdx, rbx);
  __ shrq(rdx, Immediate(1));
  __ shrq(rdx, Immediate(7));
  __ shrq_cl(rdx);


  // Immediates

  __ addq(rbx, Immediate(12));
  __ addq(Operand(rdx, rcx, times_4, 10000), Immediate(12));

  __ andq(rbx, Immediate(12345));

  __ cmpq(rbx, Immediate(12345));
  __ cmpq(rbx, Immediate(12));
  __ cmpq(Operand(rdx, rcx, times_4, 10000), Immediate(12));
  __ cmpb(rax, Immediate(100));

  __ orq(rbx, Immediate(12345));

  __ subq(rbx, Immediate(12));
  __ subq(Operand(rdx, rcx, times_4, 10000), Immediate(12));

  __ xorq(rbx, Immediate(12345));

  __ imulq(rdx, rcx, Immediate(12));
  __ imulq(rdx, rcx, Immediate(1000));

  __ cld();

  __ subq(rdx, Operand(rbx, rcx, times_4, 10000));
  __ subq(rdx, rbx);

  __ testq(rdx, Immediate(12345));
  __ testq(Operand(rbx, rcx, times_8, 10000), rdx);
  __ testb(Operand(rcx, rbx, times_2, 1000), rdx);
  __ testb(Operand(rax, -20), Immediate(0x9A));
  __ nop();

  __ xorq(rdx, Immediate(12345));
  __ xorq(rdx, Operand(rbx, rcx, times_8, 10000));
  __ bts(Operand(rbx, rcx, times_8, 10000), rdx);
  __ hlt();
  __ int3();
  __ ret(0);
  __ ret(8);

  // Calls

  Label L1, L2;
  __ bind(&L1);
  __ nop();
  __ call(&L1);
  __ call(&L2);
  __ nop();
  __ bind(&L2);
  // TODO(mstarzinger): The following is protected.
  // __ call(Operand(rbx, rcx, times_4, 10000));
  __ nop();
  Handle<Code> ic(LoadIC::initialize_stub(isolate, NOT_CONTEXTUAL));
  __ call(ic, RelocInfo::CODE_TARGET);
  __ nop();
  __ nop();

  __ jmp(&L1);
  // TODO(mstarzinger): The following is protected.
  // __ jmp(Operand(rbx, rcx, times_4, 10000));
  ExternalReference after_break_target =
      ExternalReference::debug_after_break_target_address(isolate);
  USE(after_break_target);
  __ jmp(ic, RelocInfo::CODE_TARGET);
  __ nop();


  Label Ljcc;
  __ nop();
  // long jumps
  __ j(overflow, &Ljcc);
  __ j(no_overflow, &Ljcc);
  __ j(below, &Ljcc);
  __ j(above_equal, &Ljcc);
  __ j(equal, &Ljcc);
  __ j(not_equal, &Ljcc);
  __ j(below_equal, &Ljcc);
  __ j(above, &Ljcc);
  __ j(sign, &Ljcc);
  __ j(not_sign, &Ljcc);
  __ j(parity_even, &Ljcc);
  __ j(parity_odd, &Ljcc);
  __ j(less, &Ljcc);
  __ j(greater_equal, &Ljcc);
  __ j(less_equal, &Ljcc);
  __ j(greater, &Ljcc);
  __ nop();
  __ bind(&Ljcc);
  // short jumps
  __ j(overflow, &Ljcc);
  __ j(no_overflow, &Ljcc);
  __ j(below, &Ljcc);
  __ j(above_equal, &Ljcc);
  __ j(equal, &Ljcc);
  __ j(not_equal, &Ljcc);
  __ j(below_equal, &Ljcc);
  __ j(above, &Ljcc);
  __ j(sign, &Ljcc);
  __ j(not_sign, &Ljcc);
  __ j(parity_even, &Ljcc);
  __ j(parity_odd, &Ljcc);
  __ j(less, &Ljcc);
  __ j(greater_equal, &Ljcc);
  __ j(less_equal, &Ljcc);
  __ j(greater, &Ljcc);

  // 0xD9 instructions
  __ nop();

  __ fld(1);
  __ fld1();
  __ fldz();
  __ fldpi();
  __ fabs();
  __ fchs();
  __ fprem();
  __ fprem1();
  __ fincstp();
  __ ftst();
  __ fxch(3);
  __ fld_s(Operand(rbx, rcx, times_4, 10000));
  __ fstp_s(Operand(rbx, rcx, times_4, 10000));
  __ ffree(3);
  __ fld_d(Operand(rbx, rcx, times_4, 10000));
  __ fstp_d(Operand(rbx, rcx, times_4, 10000));
  __ nop();

  __ fild_s(Operand(rbx, rcx, times_4, 10000));
  __ fistp_s(Operand(rbx, rcx, times_4, 10000));
  __ fild_d(Operand(rbx, rcx, times_4, 10000));
  __ fistp_d(Operand(rbx, rcx, times_4, 10000));
  __ fnstsw_ax();
  __ nop();
  __ fadd(3);
  __ fsub(3);
  __ fmul(3);
  __ fdiv(3);

  __ faddp(3);
  __ fsubp(3);
  __ fmulp(3);
  __ fdivp(3);
  __ fcompp();
  __ fwait();
  __ frndint();
  __ fninit();
  __ nop();

  // SSE instruction
  {
    // Move operation
    __ cvttss2si(rdx, Operand(rbx, rcx, times_4, 10000));
    __ cvttss2si(rdx, xmm1);
    __ cvtsd2ss(xmm0, xmm1);
    __ cvtsd2ss(xmm0, Operand(rbx, rcx, times_4, 10000));
    __ movaps(xmm0, xmm1);

    // logic operation
    __ andps(xmm0, xmm1);
    __ andps(xmm0, Operand(rbx, rcx, times_4, 10000));
    __ orps(xmm0, xmm1);
    __ orps(xmm0, Operand(rbx, rcx, times_4, 10000));
    __ xorps(xmm0, xmm1);
    __ xorps(xmm0, Operand(rbx, rcx, times_4, 10000));

    // Arithmetic operation
    __ addss(xmm1, xmm0);
    __ addss(xmm1, Operand(rbx, rcx, times_4, 10000));
    __ mulss(xmm1, xmm0);
    __ mulss(xmm1, Operand(rbx, rcx, times_4, 10000));
    __ subss(xmm1, xmm0);
    __ subss(xmm1, Operand(rbx, rcx, times_4, 10000));
    __ divss(xmm1, xmm0);
    __ divss(xmm1, Operand(rbx, rcx, times_4, 10000));
    __ addps(xmm1, xmm0);
    __ addps(xmm1, Operand(rbx, rcx, times_4, 10000));
    __ subps(xmm1, xmm0);
    __ subps(xmm1, Operand(rbx, rcx, times_4, 10000));
    __ mulps(xmm1, xmm0);
    __ mulps(xmm1, Operand(rbx, rcx, times_4, 10000));
    __ divps(xmm1, xmm0);
    __ divps(xmm1, Operand(rbx, rcx, times_4, 10000));

    __ ucomiss(xmm0, xmm1);
    __ ucomiss(xmm0, Operand(rbx, rcx, times_4, 10000));
  }
  // SSE 2 instructions
  {
    __ cvttsd2si(rdx, Operand(rbx, rcx, times_4, 10000));
    __ cvttsd2si(rdx, xmm1);
    __ cvttsd2siq(rdx, xmm1);
    __ cvttsd2siq(rdx, Operand(rbx, rcx, times_4, 10000));
    __ cvtqsi2sd(xmm1, Operand(rbx, rcx, times_4, 10000));
    __ cvtqsi2sd(xmm1, rdx);
    __ movsd(xmm1, Operand(rbx, rcx, times_4, 10000));
    __ movsd(Operand(rbx, rcx, times_4, 10000), xmm1);
    // 128 bit move instructions.
    __ movdqa(xmm0, Operand(rbx, rcx, times_4, 10000));
    __ movdqa(Operand(rbx, rcx, times_4, 10000), xmm0);

    __ addsd(xmm1, xmm0);
    __ addsd(xmm1, Operand(rbx, rcx, times_4, 10000));
    __ mulsd(xmm1, xmm0);
    __ mulsd(xmm1, Operand(rbx, rcx, times_4, 10000));
    __ subsd(xmm1, xmm0);
    __ subsd(xmm1, Operand(rbx, rcx, times_4, 10000));
    __ divsd(xmm1, xmm0);
    __ divsd(xmm1, Operand(rbx, rcx, times_4, 10000));
    __ ucomisd(xmm0, xmm1);

    __ andpd(xmm0, xmm1);

    __ pslld(xmm0, 6);
    __ psrld(xmm0, 6);
    __ psllq(xmm0, 6);
    __ psrlq(xmm0, 6);

    __ pcmpeqd(xmm1, xmm0);
  }

  // cmov.
  {
    __ cmovq(overflow, rax, Operand(rax, 0));
    __ cmovq(no_overflow, rax, Operand(rax, 1));
    __ cmovq(below, rax, Operand(rax, 2));
    __ cmovq(above_equal, rax, Operand(rax, 3));
    __ cmovq(equal, rax, Operand(rbx, 0));
    __ cmovq(not_equal, rax, Operand(rbx, 1));
    __ cmovq(below_equal, rax, Operand(rbx, 2));
    __ cmovq(above, rax, Operand(rbx, 3));
    __ cmovq(sign, rax, Operand(rcx, 0));
    __ cmovq(not_sign, rax, Operand(rcx, 1));
    __ cmovq(parity_even, rax, Operand(rcx, 2));
    __ cmovq(parity_odd, rax, Operand(rcx, 3));
    __ cmovq(less, rax, Operand(rdx, 0));
    __ cmovq(greater_equal, rax, Operand(rdx, 1));
    __ cmovq(less_equal, rax, Operand(rdx, 2));
    __ cmovq(greater, rax, Operand(rdx, 3));
  }

  {
    if (CpuFeatures::IsSupported(SSE4_1)) {
      CpuFeatureScope scope(&assm, SSE4_1);
      __ extractps(rax, xmm1, 0);
    }
  }

  // AVX instruction
  {
    if (CpuFeatures::IsSupported(AVX)) {
      CpuFeatureScope scope(&assm, AVX);
      __ vaddsd(xmm0, xmm1, xmm2);
      __ vaddsd(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vmulsd(xmm0, xmm1, xmm2);
      __ vmulsd(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vsubsd(xmm0, xmm1, xmm2);
      __ vsubsd(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vdivsd(xmm0, xmm1, xmm2);
      __ vdivsd(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
    }
  }

  // FMA3 instruction
  {
    if (CpuFeatures::IsSupported(FMA3)) {
      CpuFeatureScope scope(&assm, FMA3);
      __ vfmadd132sd(xmm0, xmm1, xmm2);
      __ vfmadd132sd(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vfmadd213sd(xmm0, xmm1, xmm2);
      __ vfmadd213sd(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vfmadd231sd(xmm0, xmm1, xmm2);
      __ vfmadd231sd(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));

      __ vfmadd132sd(xmm9, xmm10, xmm11);
      __ vfmadd132sd(xmm9, xmm10, Operand(r9, r11, times_4, 10000));
      __ vfmadd213sd(xmm9, xmm10, xmm11);
      __ vfmadd213sd(xmm9, xmm10, Operand(r9, r11, times_4, 10000));
      __ vfmadd231sd(xmm9, xmm10, xmm11);
      __ vfmadd231sd(xmm9, xmm10, Operand(r9, r11, times_4, 10000));

      __ vfmsub132sd(xmm0, xmm1, xmm2);
      __ vfmsub132sd(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vfmsub213sd(xmm0, xmm1, xmm2);
      __ vfmsub213sd(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vfmsub231sd(xmm0, xmm1, xmm2);
      __ vfmsub231sd(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));

      __ vfnmadd132sd(xmm0, xmm1, xmm2);
      __ vfnmadd132sd(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vfnmadd213sd(xmm0, xmm1, xmm2);
      __ vfnmadd213sd(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vfnmadd231sd(xmm0, xmm1, xmm2);
      __ vfnmadd231sd(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));

      __ vfnmsub132sd(xmm0, xmm1, xmm2);
      __ vfnmsub132sd(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vfnmsub213sd(xmm0, xmm1, xmm2);
      __ vfnmsub213sd(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vfnmsub231sd(xmm0, xmm1, xmm2);
      __ vfnmsub231sd(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));

      __ vfmadd132ss(xmm0, xmm1, xmm2);
      __ vfmadd132ss(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vfmadd213ss(xmm0, xmm1, xmm2);
      __ vfmadd213ss(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vfmadd231ss(xmm0, xmm1, xmm2);
      __ vfmadd231ss(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));

      __ vfmsub132ss(xmm0, xmm1, xmm2);
      __ vfmsub132ss(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vfmsub213ss(xmm0, xmm1, xmm2);
      __ vfmsub213ss(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vfmsub231ss(xmm0, xmm1, xmm2);
      __ vfmsub231ss(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));

      __ vfnmadd132ss(xmm0, xmm1, xmm2);
      __ vfnmadd132ss(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vfnmadd213ss(xmm0, xmm1, xmm2);
      __ vfnmadd213ss(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vfnmadd231ss(xmm0, xmm1, xmm2);
      __ vfnmadd231ss(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));

      __ vfnmsub132ss(xmm0, xmm1, xmm2);
      __ vfnmsub132ss(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vfnmsub213ss(xmm0, xmm1, xmm2);
      __ vfnmsub213ss(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
      __ vfnmsub231ss(xmm0, xmm1, xmm2);
      __ vfnmsub231ss(xmm0, xmm1, Operand(rbx, rcx, times_4, 10000));
    }
  }
  // xchg.
  {
    __ xchgq(rax, rax);
    __ xchgq(rax, rbx);
    __ xchgq(rbx, rbx);
    __ xchgq(rbx, Operand(rsp, 12));
  }

  // Nop instructions
  for (int i = 0; i < 16; i++) {
    __ Nop(i);
  }

  __ ret(0);

  CodeDesc desc;
  assm.GetCode(&desc);
  Handle<Code> code = isolate->factory()->NewCode(
      desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
  USE(code);
#ifdef OBJECT_PRINT
  OFStream os(stdout);
  code->Print(os);
  byte* begin = code->instruction_start();
  byte* end = begin + code->instruction_size();
  disasm::Disassembler::Disassemble(stdout, begin, end);
#endif
}

#undef __