// Copyright 2013 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
//     * Rrdistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Rrdistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
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//       with the distribution.
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//       contributors may be used to endorse or promote products derived
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//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include <stdlib.h>

#include "src/v8.h"

#include "src/base/platform/platform.h"
#include "src/code-stubs.h"
#include "src/factory.h"
#include "src/macro-assembler.h"
#include "src/objects-inl.h"
#include "src/register-configuration.h"
#include "test/cctest/cctest.h"
#include "test/cctest/test-code-stubs.h"

using namespace v8::internal;


#define __ assm.

ConvertDToIFunc MakeConvertDToIFuncTrampoline(Isolate* isolate,
                                              Register source_reg,
                                              Register destination_reg) {
  // Allocate an executable page of memory.
  size_t actual_size;
  byte* buffer = static_cast<byte*>(v8::base::OS::Allocate(
      Assembler::kMinimalBufferSize, &actual_size, true));
  CHECK(buffer);
  HandleScope handles(isolate);
  MacroAssembler assm(isolate, buffer, static_cast<int>(actual_size),
                      v8::internal::CodeObjectRequired::kYes);
  int offset =
    source_reg.is(rsp) ? 0 : (HeapNumber::kValueOffset - kSmiTagSize);
  DoubleToIStub stub(isolate, source_reg, destination_reg, offset, true);
  byte* start = stub.GetCode()->instruction_start();

  __ pushq(rbx);
  __ pushq(rcx);
  __ pushq(rdx);
  __ pushq(rsi);
  __ pushq(rdi);

  const RegisterConfiguration* config = RegisterConfiguration::Default();
  if (!source_reg.is(rsp)) {
    // The argument we pass to the stub is not a heap number, but instead
    // stack-allocated and offset-wise made to look like a heap number for
    // the stub.  We create that "heap number" after pushing all allocatable
    // registers.
    int double_argument_slot =
        (config->num_allocatable_general_registers() - 1) * kPointerSize +
        kDoubleSize;
    __ leaq(source_reg, MemOperand(rsp, -double_argument_slot - offset));
  }

  // Save registers make sure they don't get clobbered.
  int reg_num = 0;
  for (; reg_num < config->num_allocatable_general_registers(); ++reg_num) {
    Register reg =
        Register::from_code(config->GetAllocatableGeneralCode(reg_num));
    if (!reg.is(rsp) && !reg.is(rbp) && !reg.is(destination_reg)) {
      __ pushq(reg);
    }
  }

  // Put the double argument into the designated double argument slot.
  __ subq(rsp, Immediate(kDoubleSize));
  __ Movsd(MemOperand(rsp, 0), xmm0);

  // Call through to the actual stub
  __ Call(start, RelocInfo::EXTERNAL_REFERENCE);

  __ addq(rsp, Immediate(kDoubleSize));

  // Make sure no registers have been unexpectedly clobbered
  for (--reg_num; reg_num >= 0; --reg_num) {
    Register reg =
        Register::from_code(config->GetAllocatableGeneralCode(reg_num));
    if (!reg.is(rsp) && !reg.is(rbp) && !reg.is(destination_reg)) {
      __ cmpq(reg, MemOperand(rsp, 0));
      __ Assert(equal, kRegisterWasClobbered);
      __ addq(rsp, Immediate(kPointerSize));
    }
  }

  __ movq(rax, destination_reg);

  __ popq(rdi);
  __ popq(rsi);
  __ popq(rdx);
  __ popq(rcx);
  __ popq(rbx);

  __ ret(0);

  CodeDesc desc;
  assm.GetCode(isolate, &desc);
  return reinterpret_cast<ConvertDToIFunc>(
      reinterpret_cast<intptr_t>(buffer));
}

#undef __


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


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 source_registers[] = {rsp, rax, rbx, rcx, rdx, rsi, rdi, r8, r9};
  Register dest_registers[] = {rax, rbx, rcx, rdx, rsi, rdi, r8, r9};

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