// Copyright 2013 the V8 project authors. All rights reserved.
// Rrdistribution and use in source and binary forms, with or without
// 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
//       disclaimer in the documentation and/or other materials provided
//       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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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include <stdlib.h>

#include "v8.h"

#include "cctest.h"
#include "code-stubs.h"
#include "test-code-stubs.h"
#include "factory.h"
#include "macro-assembler.h"
#include "platform.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*>(OS::Allocate(Assembler::kMinimalBufferSize,
                                                   &actual_size,
                                                   true));
  CHECK(buffer);
  HandleScope handles(isolate);
  MacroAssembler assm(isolate, buffer, static_cast<int>(actual_size));
  int offset =
    source_reg.is(rsp) ? 0 : (HeapNumber::kValueOffset - kSmiTagSize);
  DoubleToIStub stub(source_reg, destination_reg, offset, true);
  byte* start = stub.GetCode(isolate)->instruction_start();

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

  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 =
        (Register::NumAllocatableRegisters() - 1) * kPointerSize + kDoubleSize;
    __ lea(source_reg, MemOperand(rsp, -double_argument_slot - offset));
  }

  // Save registers make sure they don't get clobbered.
  int reg_num = 0;
  for (;reg_num < Register::NumAllocatableRegisters(); ++reg_num) {
    Register reg = Register::FromAllocationIndex(reg_num);
    if (!reg.is(rsp) && !reg.is(rbp) && !reg.is(destination_reg)) {
      __ push(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::FromAllocationIndex(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);

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

  __ ret(0);

  CodeDesc desc;
  assm.GetCode(&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]));
    }
  }
}
