// 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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//
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#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"
#include "simulator.h"

using namespace v8::internal;

#define __ masm.

ConvertDToIFunc MakeConvertDToIFuncTrampoline(Isolate* isolate,
                                              Register source_reg,
                                              Register destination_reg,
                                              bool inline_fastpath) {
  // Allocate an executable page of memory.
  size_t actual_size = 4 * Assembler::kMinimalBufferSize;
  byte* buffer = static_cast<byte*>(OS::Allocate(actual_size,
                                                 &actual_size,
                                                 true));
  CHECK(buffer);
  HandleScope handles(isolate);
  MacroAssembler masm(isolate, buffer, static_cast<int>(actual_size));
  DoubleToIStub stub(isolate, source_reg, destination_reg, 0, true,
                     inline_fastpath);

  byte* start = stub.GetCode()->instruction_start();
  Label done;

  __ SetStackPointer(csp);
  __ PushCalleeSavedRegisters();
  __ Mov(jssp, csp);
  __ SetStackPointer(jssp);

  // Push the double argument.
  __ Push(d0);
  __ Mov(source_reg, jssp);

  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::NumAllocatableRegisters(); ++reg_num) {
    Register reg = Register::from_code(reg_num);
    if (!reg.is(destination_reg)) {
      queue.Queue(reg);
      source_reg_offset += kPointerSize;
    }
  }
  // Re-push the double argument.
  queue.Queue(d0);

  queue.PushQueued();

  // Call through to the actual stub
  if (inline_fastpath) {
    __ Ldr(d0, MemOperand(source_reg));
    __ TryConvertDoubleToInt64(destination_reg, d0, &done);
    if (destination_reg.is(source_reg)) {
      // Restore clobbered source_reg.
      __ add(source_reg, jssp, Operand(source_reg_offset));
    }
  }
  __ Call(start, RelocInfo::EXTERNAL_REFERENCE);
  __ bind(&done);

  __ Drop(1, kDoubleSize);

  // // Make sure no registers have been unexpectedly clobbered
  for (--reg_num; reg_num >= 0; --reg_num) {
    Register reg = Register::from_code(reg_num);
    if (!reg.is(destination_reg)) {
      __ Pop(ip0);
      __ cmp(reg, ip0);
      __ Assert(eq, kRegisterWasClobbered);
    }
  }

  __ Drop(1, kDoubleSize);

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

  // Restore callee save registers.
  __ Mov(csp, jssp);
  __ SetStackPointer(csp);
  __ PopCalleeSavedRegisters();

  __ Ret();

  CodeDesc desc;
  masm.GetCode(&desc);
  CPU::FlushICache(buffer, actual_size);
  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
  Simulator::CallArgument args[] = {
      Simulator::CallArgument(from),
      Simulator::CallArgument::End()
  };
  return Simulator::current(Isolate::Current())->CallInt64(
      FUNCTION_ADDR(func), args);
#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 source_registers[] = {jssp, x0, x1, x2, x3, x4, x5, x6, x7, x8, x9,
                                 x10, x11, x12, x13, x14, x15, x18, x19, x20,
                                 x21, x22, x23, x24};
  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 s = 0; s < sizeof(source_registers) / sizeof(Register); s++) {
    for (size_t d = 0; d < sizeof(dest_registers) / sizeof(Register); d++) {
      RunAllTruncationTests(
          RunGeneratedCodeCallWrapper,
          MakeConvertDToIFuncTrampoline(isolate,
                                        source_registers[s],
                                        dest_registers[d],
                                        false));
      RunAllTruncationTests(
          RunGeneratedCodeCallWrapper,
          MakeConvertDToIFuncTrampoline(isolate,
                                        source_registers[s],
                                        dest_registers[d],
                                        true));
    }
  }
}