// This file is distributed under a BSD license. See LICENSE.txt for details.

#include "_types.hpp"
#include "mapfile.hpp"
#include <algorithm>

// HACK: report buffer is 1mb fixed size

/****************************************************************************/

void DebugInfo::Init()
{
  Strings.Init();
  StringData.Init();
  Symbols.Init();
  Files.Init();
  NameSps.Init();

  BaseAddress = 0;
}

void DebugInfo::Exit()
{
  NameSps.Exit();
  Files.Exit();
  Symbols.Exit();
  StringData.Exit();
  Strings.Exit();
}

sInt DebugInfo::MakeString(sChar *string)
{
  // TODO: write a better implementation using hashing

  sInt i;

  for(i=0;i<Strings.Count;i++)
    if(!sCmpString(string,&StringData[Strings[i]]))
      return Strings[i];

  i = StringData.Count;
  while(*string)
    *StringData.Add() = *string++;

  *StringData.Add() = 0;
  *Strings.Add() = i;

  return i;
}

bool virtAddressComp(const DISymbol &a,const DISymbol &b)
{
  return a.VA < b.VA;
}

void DebugInfo::FinishedReading()
{
  // fix strings
  for(sInt i=0;i<Symbols.Count;i++)
  {
    DISymbol *sym = &Symbols[i];
    sym->Name.String = &StringData[sym->Name.Index];
    sym->MangledName.String = &StringData[sym->MangledName.Index];
  }

  for(sInt i=0;i<Files.Count;i++)
    Files[i].Name.String = &StringData[Files[i].Name.Index];

  for(sInt i=0;i<NameSps.Count;i++)
    NameSps[i].Name.String = &StringData[NameSps[i].Name.Index];

  // sort symbols by virtual address
  std::sort(&Symbols[0],&Symbols[Symbols.Count],virtAddressComp);

  // remove address double-covers
  sInt symCount = Symbols.Count;
  DISymbol *syms = new DISymbol[symCount];
  sCopyMem(syms,&Symbols[0],symCount * sizeof(DISymbol));

  Symbols.Count = 0;
  sU32 oldVA = 0;
  sChar *oldName = "";
  sInt oldSize = 0;

  for(sInt i=0;i<symCount;i++)
  {
    DISymbol *in = &syms[i];
    sU32 newVA = in->VA;
    sU32 newSize = in->Size;

    if(oldVA != 0)
    {
      sInt adjust = newVA - oldVA;
      if(adjust < 0) // we have to shorten
      {
        newVA = oldVA;
        if(newSize >= (sU32) -adjust)
          newSize += adjust;
      }
    }

    if(newSize || in->Class == DIC_END)
    {
      DISymbol *out = Symbols.Add();
      *out = *in;
      out->VA = newVA;
      out->Size = newSize;
      
      oldVA = newVA + newSize;
      oldSize = newSize;
      oldName = in->Name.String;
    }
  }

  delete[] syms;
}

void DebugInfo::Rebase(sU32 newBase)
{
  sU32 delta = newBase - BaseAddress;

  for(sInt i=0;i<Symbols.Count;i++)
    Symbols[i].VA += delta;

  BaseAddress = newBase;
}

sInt DebugInfo::GetFile(sInt name)
{
  for(sInt i=0;i<Files.Count;i++)
    if(Files[i].Name.Index == name)
      return i;

  DISymFile *file = Files.Add();
  file->Name.Index = name;
  file->PackedSize = 0;
  file->Size = 0;

  return Files.Count - 1;
}

sInt DebugInfo::GetFileByName(sChar *name)
{
  sChar *p;

  // skip path seperators
  while((p = (sChar *) sFindString(name,"\\")))
    name = p + 1;

  while((p = (sChar *) sFindString(name,"/")))
    name = p + 1;

  return GetFile(MakeString(name));
}

sInt DebugInfo::GetNameSpace(sInt name)
{
  for(sInt i=0;i<NameSps.Count;i++)
    if(NameSps[i].Name.Index == name)
      return i;

  DISymNameSp *namesp = NameSps.Add();
  namesp->Name.Index = name;
  namesp->PackedSize = 0;
  namesp->Size = 0;

  return NameSps.Count - 1;
}

sInt DebugInfo::GetNameSpaceByName(sChar *name)
{
  sChar *pp = name - 2;
  sChar *p;
  sInt cname;

  while((p = (sChar *) sFindString(pp+2,"::")))
    pp = p;

  while((p = (sChar *) sFindString(pp+1,".")))
    pp = p;

  if(pp != name - 2)
  {
    sChar buffer[2048];
    sCopyString(buffer,name,2048);

    if(pp - name < 2048)
      buffer[pp - name] = 0;

    cname = MakeString(buffer);
  }
  else
    cname = MakeString("<global>");

  return GetNameSpace(cname);
}

void DebugInfo::StartAnalyze(sU32 startAddress,ReorderBuffer *reorder)
{
  sInt i;

  Address = startAddress;
  Reorder = reorder;
  Reorder->Finish();

  for(i=0;i<Symbols.Count;i++)
    Symbols[i].PackedSize = 0.0f;

  for(i=0;i<Files.Count;i++)
  {
    Files[i].Size = 0;
    Files[i].PackedSize = 0.0f;
  }

  for(i=0;i<NameSps.Count;i++)
  {
    NameSps[i].Size = 0;
    NameSps[i].PackedSize = 0.0f;
  }
}

void DebugInfo::TokenizeCallback(void *user,sInt uncompSize,sF32 compSize)
{
  DebugInfo *info;
  DISymbol *sym;
  sU32 addr;
  sInt leftSize,availSize,len;
  ReorderItem *reord;
  
  info = (DebugInfo *) user;
  leftSize = uncompSize;

  while(leftSize)
  {
    // setup
    availSize = leftSize;
    addr = info->Address;

    // find out whether there is a remapping for the current address range
    if(info->Reorder)
    {
      if(!info->Reorder->Find(addr,&reord)) // no match
      {
        if(reord)
          len = sMin<sInt>(availSize,reord->NewVA - addr);
        else
          len = availSize;

        info->Address += len;
        leftSize -= len;
      }
      else
      {
        len = sMin<sInt>(availSize,reord->NewVA + reord->NewSize - addr);
        info->Address += len;
        leftSize -= len;

        // just a crude approximation here, gotta fix it somehow
        availSize = reord->OldSize * len / reord->NewSize;
        addr = reord->OldVA + (reord->OldSize * (addr - reord->NewVA) + reord->NewSize/2) / reord->NewSize;
      }
    }
    else
    {
      info->Address += availSize;
      leftSize -= availSize;
    }

    // try to find symbol for current address
    while(availSize)
    {
      if(!info->FindSymbol(addr,&sym)) // no match
      {
        if(sym) // skip to next symbol or everything if there's no next symbol
          len = sMin<sInt>(availSize,sym->VA - addr);
        else
          len = availSize;

        addr += len;
        availSize -= len;
      }
      else // match with symbol
      {
        len = sMin<sInt>(availSize,sym->VA + sym->Size - addr);
        addr += len;
        availSize -= len;

        sym->PackedSize += compSize * 0.125f * len / uncompSize;
      }
    }
  }
}

void DebugInfo::FinishAnalyze()
{
  sInt i;

  for(i=0;i<Symbols.Count;i++)
  {
    if(Symbols[i].Class != DIC_END)
    {
      Files[Symbols[i].FileNum].Size += Symbols[i].Size;
      Files[Symbols[i].FileNum].PackedSize += Symbols[i].PackedSize;
      NameSps[Symbols[i].NameSpNum].Size += Symbols[i].Size;
      NameSps[Symbols[i].NameSpNum].PackedSize += Symbols[i].PackedSize;
    }
  }
}

sBool DebugInfo::FindSymbol(sU32 VA,DISymbol **sym)
{
  sInt l,r,x;

  l = 0;
  r = Symbols.Count;
  while(l<r)
  {
    x = (l + r) / 2;

    if(VA < Symbols[x].VA)
      r = x; // continue in left half
    else if(VA >= Symbols[x].VA + Symbols[x].Size)
      l = x + 1; // continue in left half
    else
    {
      *sym = &Symbols[x]; // we found a match
      return sTRUE;
    }
  }

  *sym = (l + 1 < Symbols.Count) ? &Symbols[l+1] : 0;
  return sFALSE;
}

static sChar ReportBuffer[1024*1024];

bool symPackedSizeComp(const DISymbol &a,const DISymbol &b)
{
  return a.PackedSize > b.PackedSize;
}

bool namePackedSizeComp(const DISymNameSp &a,const DISymNameSp &b)
{
  return a.PackedSize > b.PackedSize;
}

bool filePackedSizeComp(const DISymFile &a,const DISymFile &b)
{
  return a.PackedSize > b.PackedSize;
}

sChar *DebugInfo::WriteReport()
{
  sChar *Report;
  sInt i,j;
  sU32 size;
  sF32 pSize;
  
  Report = ReportBuffer;
  sSPrintF(Report,512,"kkrunchy >> pack ratio report\n\n");
  Report += sGetStringLen(Report);

  sSPrintF(Report,512,"Functions by packed size:\n");
  Report += sGetStringLen(Report);

  std::sort(&Symbols[0],&Symbols[Symbols.Count],symPackedSizeComp);

  for(i=0;i<Symbols.Count;i++)
  {
    if(Symbols[i].Class == DIC_CODE)
    {
      sSPrintF(Report,512,"%5d.%02d/%8d: %-50s %s\n",
        (sInt) Symbols[i].PackedSize,sInt(Symbols[i].PackedSize*100)%100,
        Symbols[i].Size,Symbols[i].Name,Files[Symbols[i].FileNum].Name);

      Report += sGetStringLen(Report);
    }
  }

  sSPrintF(Report,512,"\nData by packed size:\n");
  Report += sGetStringLen(Report);
  for(i=0;i<Symbols.Count;i++)
  {
    if(Symbols[i].Class == DIC_DATA)
    {
      sSPrintF(Report,512,"%5d.%02d/%8d: %-50s %s\n",
        (sInt) Symbols[i].PackedSize,sInt(Symbols[i].PackedSize*100)%100,
        Symbols[i].Size,Symbols[i].Name,Files[Symbols[i].FileNum].Name);

      Report += sGetStringLen(Report);
    }
  }

  sSPrintF(Report,512,"\nFunctions by object file and packed size:\n");
  Report += sGetStringLen(Report);

  for(i=1;i<Symbols.Count;i++)
    for(j=i;j>0;j--)
    {
      sInt f1 = Symbols[j].FileNum;
      sInt f2 = Symbols[j-1].FileNum;

      if(f1 == -1 || f2 != -1 && sCmpStringI(Files[f1].Name.String,Files[f2].Name.String) < 0)
        sSwap(Symbols[j],Symbols[j-1]);
    }

  for(i=0;i<Symbols.Count;i++)
  {
    if(Symbols[i].Class == DIC_CODE)
    {
      sSPrintF(Report,512,"%5d.%02d/%8d: %-50s %s\n",
        (sInt) Symbols[i].PackedSize,sInt(Symbols[i].PackedSize*100)%100,
        Symbols[i].Size,Symbols[i].Name,Files[Symbols[i].FileNum].Name);

      Report += sGetStringLen(Report);
    }
  }

  sSPrintF(Report,512,"\nClasses/Namespaces by packed size:\n");
  Report += sGetStringLen(Report);
  std::sort(&NameSps[0],&NameSps[NameSps.Count],namePackedSizeComp);

  for(i=0;i<NameSps.Count;i++)
  {
    sSPrintF(Report,512,"%5d.%02d/%8d: %s\n",sInt(NameSps[i].PackedSize),
      sInt(NameSps[i].PackedSize*100)%100,NameSps[i].Size,NameSps[i].Name);
    Report += sGetStringLen(Report);
  }

  sSPrintF(Report,512,"\nObject files by packed size:\n");
  Report += sGetStringLen(Report);
  std::sort(&Files[0],&Files[Files.Count],filePackedSizeComp);

  for(i=0;i<Files.Count;i++)
  {
    sSPrintF(Report,512,"%5d.%02d/%8d: %s\n",sInt(Files[i].PackedSize),
      sInt(Files[i].PackedSize*100)%100,Files[i].Size,Files[i].Name);
    Report += sGetStringLen(Report);
  }

  size = 0;
  pSize = 0.0f;
  for(i=0;i<Symbols.Count;i++)
  {
    if(Symbols[i].Class == DIC_CODE)
    {
      size += Symbols[i].Size;
      pSize += Symbols[i].PackedSize;
    }
  }

  sSPrintF(Report,512,"\nOverall code: %5d.%02d/%8d\n",sInt(pSize),
    sInt(pSize*100)%100,size);
  Report += sGetStringLen(Report);

  size = 0;
  pSize = 0.0f;
  for(i=0;i<Symbols.Count;i++)
  {
    if(Symbols[i].Class == DIC_DATA)
    {
      size += Symbols[i].Size;
      pSize += Symbols[i].PackedSize;
    }
  }

  sSPrintF(Report,512,"Overall data: %5d.%02d/%8d\n",sInt(pSize),
    sInt(pSize*100)%100,size);
  Report += sGetStringLen(Report);

  return sDupString(ReportBuffer,1);
}

/****************************************************************************/

ReorderBuffer::ReorderBuffer()
{
  Reorder.Init();
}

ReorderBuffer::~ReorderBuffer()
{
  Reorder.Exit();
}

void ReorderBuffer::Add(sU32 newVA,sU32 newSize,sU32 oldVA,sU32 oldSize)
{
  ReorderItem *item;
  
  item = Reorder.Add();
  item->NewVA = newVA;
  item->NewSize = newSize;
  item->OldVA  = oldVA;
  item->OldSize = oldSize;
}

static bool reorderComp(const ReorderItem &a,const ReorderItem &b)
{
  return a.NewVA < b.NewVA;
}

void ReorderBuffer::Finish()
{
  // sort by new start address
  // (these are *lots* of records, so use a decent sort)
  std::sort(&Reorder[0],&Reorder[Reorder.Count],reorderComp);

  // just to be sure, assert we have no overlaps
  for(sInt i=0;i<Reorder.Count-1;i++)
    sVERIFY(Reorder[i].NewVA + Reorder[i].NewSize <= Reorder[i+1].NewVA);
}

sBool ReorderBuffer::Find(sU32 addr,ReorderItem **reord)
{
  sInt l,r,x;

  l = 0;
  r = Reorder.Count;
  while(l<r)
  {
    x = (l + r) / 2;
    if(addr < Reorder[x].NewVA)
      r = x; // continue in left half
    else if(addr >= Reorder[x].NewVA + Reorder[x].NewSize)
      l = x + 1; // continue in right half
    else
    {
      *reord = &Reorder[x]; // we got a match
      return sTRUE;
    }
  }

  *reord = (l + 1 < Reorder.Count) ? &Reorder[l + 1] : 0;
  return sFALSE;
}

/****************************************************************************/