// Copyright 2013 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.
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#include <stdlib.h>

#include "src/v8.h"

#include "src/arm64/macro-assembler-arm64-inl.h"
#include "src/base/platform/platform.h"
#include "src/code-stubs.h"
#include "src/heap/factory.h"
#include "src/macro-assembler.h"
#include "src/simulator.h"
#include "test/cctest/cctest.h"
#include "test/cctest/test-code-stubs.h"

namespace v8 {
namespace internal {

#define __ masm.

ConvertDToIFunc MakeConvertDToIFuncTrampoline(Isolate* isolate,
                                              Register destination_reg) {
  HandleScope handles(isolate);

  size_t allocated;
  byte* buffer =
      AllocateAssemblerBuffer(&allocated, 4 * Assembler::kMinimalBufferSize);
  MacroAssembler masm(isolate, buffer, static_cast<int>(allocated),
                      v8::internal::CodeObjectRequired::kYes);

  Handle<Code> code = BUILTIN_CODE(isolate, DoubleToI);
  Address start = code->InstructionStart();

  __ PushCalleeSavedRegisters();

  MacroAssembler::PushPopQueue queue(&masm);

  // Save registers make sure they don't get clobbered.
  int source_reg_offset = kDoubleSize;
  int reg_num = 0;
  for (; reg_num < Register::kNumRegisters; ++reg_num) {
    if (RegisterConfiguration::Default()->IsAllocatableGeneralCode(reg_num)) {
      Register reg = Register::from_code(reg_num);
      queue.Queue(reg);
      source_reg_offset += kPointerSize;
    }
  }
  // Push the double argument. We push a second copy to maintain sp alignment.
  queue.Queue(d0);
  queue.Queue(d0);

  queue.PushQueued();

  // Call through to the actual stub.
  __ IndirectCall(start, RelocInfo::CODE_TARGET);
  __ Peek(destination_reg, 0);

  __ Drop(2, kDoubleSize);

  // Make sure no registers have been unexpectedly clobbered.
  {
    const RegisterConfiguration* config(RegisterConfiguration::Default());
    int allocatable_register_count =
        config->num_allocatable_general_registers();
    UseScratchRegisterScope temps(&masm);
    Register temp0 = temps.AcquireX();
    Register temp1 = temps.AcquireX();
    for (int i = allocatable_register_count - 1; i > 0; i -= 2) {
      int code0 = config->GetAllocatableGeneralCode(i);
      int code1 = config->GetAllocatableGeneralCode(i - 1);
      Register reg0 = Register::from_code(code0);
      Register reg1 = Register::from_code(code1);
      __ Pop(temp0, temp1);
      if (!reg0.is(destination_reg)) {
        __ Cmp(reg0, temp0);
        __ Assert(eq, AbortReason::kRegisterWasClobbered);
      }
      if (!reg1.is(destination_reg)) {
        __ Cmp(reg1, temp1);
        __ Assert(eq, AbortReason::kRegisterWasClobbered);
      }
    }

    if (allocatable_register_count % 2 != 0) {
      int code = config->GetAllocatableGeneralCode(0);
      Register reg = Register::from_code(code);
      __ Pop(temp0, xzr);
      if (!reg.is(destination_reg)) {
        __ Cmp(reg, temp0);
        __ Assert(eq, AbortReason::kRegisterWasClobbered);
      }
    }
  }

  if (!destination_reg.is(x0))
    __ Mov(x0, destination_reg);

  // Restore callee save registers.
  __ PopCalleeSavedRegisters();

  __ Ret();

  CodeDesc desc;
  masm.GetCode(isolate, &desc);
  MakeAssemblerBufferExecutable(buffer, allocated);
  Assembler::FlushICache(buffer, allocated);
  return (reinterpret_cast<ConvertDToIFunc>(
      reinterpret_cast<intptr_t>(buffer)));
}

#undef __


static Isolate* GetIsolateFrom(LocalContext* context) {
  return reinterpret_cast<Isolate*>((*context)->GetIsolate());
}


int32_t RunGeneratedCodeCallWrapper(ConvertDToIFunc func,
                                    double from) {
#ifdef USE_SIMULATOR
  return Simulator::current(CcTest::i_isolate())
      ->Call<int32_t>(FUNCTION_ADDR(func), from);
#else
  return (*func)(from);
#endif
}


TEST(ConvertDToI) {
  CcTest::InitializeVM();
  LocalContext context;
  Isolate* isolate = GetIsolateFrom(&context);
  HandleScope scope(isolate);

#if DEBUG
  // Verify that the tests actually work with the C version. In the release
  // code, the compiler optimizes it away because it's all constant, but does it
  // wrong, triggering an assert on gcc.
  RunAllTruncationTests(&ConvertDToICVersion);
#endif

  Register dest_registers[] = {x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11,
                               x12, x13, x14, x15, x18, x19, x20, x21, x22, x23,
                               x24};

  for (size_t d = 0; d < sizeof(dest_registers) / sizeof(Register); d++) {
    RunAllTruncationTests(
        RunGeneratedCodeCallWrapper,
        MakeConvertDToIFuncTrampoline(isolate, dest_registers[d]));
  }
}

}  // namespace internal
}  // namespace v8