// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#include "Core/PowerPC/JitInterface.h"

#include <algorithm>
#include <cinttypes>
#include <cstdio>
#include <string>
#include <unordered_set>

#ifdef _WIN32
#include <windows.h>
#else
#include "Common/PerformanceCounter.h"
#endif

#include "Common/ChunkFile.h"
#include "Common/CommonTypes.h"
#include "Common/File.h"
#include "Common/MsgHandler.h"

#include "Core/Core.h"
#include "Core/PowerPC/CPUCoreBase.h"
#include "Core/PowerPC/CachedInterpreter/CachedInterpreter.h"
#include "Core/PowerPC/JitCommon/JitBase.h"
#include "Core/PowerPC/PPCSymbolDB.h"
#include "Core/PowerPC/PowerPC.h"
#include "Core/PowerPC/Profiler.h"

#if _M_X86
#include "Core/PowerPC/Jit64/Jit.h"
#endif

#if _M_ARM_64
#include "Core/PowerPC/JitArm64/Jit.h"
#endif

namespace JitInterface
{
void DoState(PointerWrap& p)
{
  if (g_jit && p.GetMode() == PointerWrap::MODE_READ)
    g_jit->ClearCache();
}
CPUCoreBase* InitJitCore(int core)
{
  switch (core)
  {
#if _M_X86
  case PowerPC::CORE_JIT64:
    g_jit = new Jit64();
    break;
#endif
#if _M_ARM_64
  case PowerPC::CORE_JITARM64:
    g_jit = new JitArm64();
    break;
#endif
  case PowerPC::CORE_CACHEDINTERPRETER:
    g_jit = new CachedInterpreter();
    break;

  default:
    PanicAlert("Unrecognizable cpu_core: %d", core);
    g_jit = nullptr;
    return nullptr;
  }
  g_jit->Init();
  return g_jit;
}

CPUCoreBase* GetCore()
{
  return g_jit;
}

void WriteProfileResults(const std::string& filename)
{
  ProfileStats prof_stats;
  GetProfileResults(&prof_stats);

  File::IOFile f(filename, "w");
  if (!f)
  {
    PanicAlert("Failed to open %s", filename.c_str());
    return;
  }
  fprintf(f.GetHandle(), "origAddr\tblkName\trunCount\tcost\ttimeCost\tpercent\ttimePercent\tOvAlli"
                         "nBlkTime(ms)\tblkCodeSize\n");
  for (auto& stat : prof_stats.block_stats)
  {
    std::string name = g_symbolDB.GetDescription(stat.addr);
    double percent = 100.0 * (double)stat.cost / (double)prof_stats.cost_sum;
    double timePercent = 100.0 * (double)stat.tick_counter / (double)prof_stats.timecost_sum;
    fprintf(f.GetHandle(),
            "%08x\t%s\t%" PRIu64 "\t%" PRIu64 "\t%" PRIu64 "\t%.2f\t%.2f\t%.2f\t%i\n", stat.addr,
            name.c_str(), stat.run_count, stat.cost, stat.tick_counter, percent, timePercent,
            (double)stat.tick_counter * 1000.0 / (double)prof_stats.countsPerSec, stat.block_size);
  }
}

void GetProfileResults(ProfileStats* prof_stats)
{
  // Can't really do this with no g_jit core available
  if (!g_jit)
    return;

  prof_stats->cost_sum = 0;
  prof_stats->timecost_sum = 0;
  prof_stats->block_stats.clear();

  Core::State old_state = Core::GetState();
  if (old_state == Core::State::Running)
    Core::SetState(Core::State::Paused);

  QueryPerformanceFrequency((LARGE_INTEGER*)&prof_stats->countsPerSec);
  g_jit->GetBlockCache()->RunOnBlocks([&prof_stats](const JitBlock& block) {
    const auto& data = block.profile_data;
    u64 cost = data.downcountCounter;
    u64 timecost = data.ticCounter;
    // Todo: tweak.
    if (data.runCount >= 1)
      prof_stats->block_stats.emplace_back(block.effectiveAddress, cost, timecost, data.runCount,
                                           block.codeSize);
    prof_stats->cost_sum += cost;
    prof_stats->timecost_sum += timecost;
  });

  sort(prof_stats->block_stats.begin(), prof_stats->block_stats.end());
  if (old_state == Core::State::Running)
    Core::SetState(Core::State::Running);
}

int GetHostCode(u32* address, const u8** code, u32* code_size)
{
  if (!g_jit)
  {
    *code_size = 0;
    return 1;
  }

  JitBlock* block = g_jit->GetBlockCache()->GetBlockFromStartAddress(*address, MSR);
  if (!block)
  {
    for (int i = 0; i < 500; i++)
    {
      block = g_jit->GetBlockCache()->GetBlockFromStartAddress(*address - 4 * i, MSR);
      if (block)
        break;
    }

    if (block)
    {
      if (!(block->effectiveAddress <= *address &&
            block->originalSize + block->effectiveAddress >= *address))
        block = nullptr;
    }

    // Do not merge this "if" with the above - block_num changes inside it.
    if (!block)
    {
      *code_size = 0;
      return 2;
    }
  }

  *code = block->checkedEntry;
  *code_size = block->codeSize;
  *address = block->effectiveAddress;
  return 0;
}

bool HandleFault(uintptr_t access_address, SContext* ctx)
{
  // Prevent nullptr dereference on a crash with no JIT present
  if (!g_jit)
  {
    return false;
  }

  return g_jit->HandleFault(access_address, ctx);
}

bool HandleStackFault()
{
  if (!g_jit)
  {
    return false;
  }

  return g_jit->HandleStackFault();
}

void ClearCache()
{
  if (g_jit)
    g_jit->ClearCache();
}
void ClearSafe()
{
  // This clear is "safe" in the sense that it's okay to run from
  // inside a JIT'ed block: it clears the instruction cache, but not
  // the JIT'ed code.
  // TODO: There's probably a better way to handle this situation.
  if (g_jit)
    g_jit->GetBlockCache()->Clear();
}

void InvalidateICache(u32 address, u32 size, bool forced)
{
  if (g_jit)
    g_jit->GetBlockCache()->InvalidateICache(address, size, forced);
}

void CompileExceptionCheck(ExceptionType type)
{
  if (!g_jit)
    return;

  std::unordered_set<u32>* exception_addresses = nullptr;

  switch (type)
  {
  case ExceptionType::FIFOWrite:
    exception_addresses = &g_jit->js.fifoWriteAddresses;
    break;
  case ExceptionType::PairedQuantize:
    exception_addresses = &g_jit->js.pairedQuantizeAddresses;
    break;
  case ExceptionType::SpeculativeConstants:
    exception_addresses = &g_jit->js.noSpeculativeConstantsAddresses;
    break;
  }

  if (PC != 0 && (exception_addresses->find(PC)) == (exception_addresses->end()))
  {
    if (type == ExceptionType::FIFOWrite)
    {
      // Check in case the code has been replaced since: do we need to do this?
      int optype = GetOpInfo(PowerPC::HostRead_U32(PC))->type;
      if (optype != OPTYPE_STORE && optype != OPTYPE_STOREFP && (optype != OPTYPE_STOREPS))
        return;
    }
    exception_addresses->insert(PC);

    // Invalidate the JIT block so that it gets recompiled with the external exception check
    // included.
    g_jit->GetBlockCache()->InvalidateICache(PC, 4, true);
  }
}

void Shutdown()
{
  if (g_jit)
  {
    g_jit->Shutdown();
    delete g_jit;
    g_jit = nullptr;
  }
}
}