//
// Copyright (c) 2002-2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

#if defined(_MSC_VER)
#pragma warning(disable: 4718)
#endif

#include "compiler/translator/Types.h"

#include <algorithm>
#include <climits>

const char* getBasicString(TBasicType t)
{
    switch (t)
    {
      case EbtVoid:                 return "void";                 break;
      case EbtFloat:                return "float";                break;
      case EbtInt:                  return "int";                  break;
      case EbtUInt:                 return "uint";                 break;
      case EbtBool:                 return "bool";                 break;
      case EbtSampler2D:            return "sampler2D";            break;
      case EbtSampler3D:            return "sampler3D";            break;
      case EbtSamplerCube:          return "samplerCube";          break;
      case EbtSamplerExternalOES:   return "samplerExternalOES";   break;
      case EbtSampler2DRect:        return "sampler2DRect";        break;
      case EbtSampler2DArray:       return "sampler2DArray";       break;
      case EbtISampler2D:           return "isampler2D";           break;
      case EbtISampler3D:           return "isampler3D";           break;
      case EbtISamplerCube:         return "isamplerCube";         break;
      case EbtISampler2DArray:      return "isampler2DArray";      break;
      case EbtUSampler2D:           return "usampler2D";           break;
      case EbtUSampler3D:           return "usampler3D";           break;
      case EbtUSamplerCube:         return "usamplerCube";         break;
      case EbtUSampler2DArray:      return "usampler2DArray";      break;
      case EbtSampler2DShadow:      return "sampler2DShadow";      break;
      case EbtSamplerCubeShadow:    return "samplerCubeShadow";    break;
      case EbtSampler2DArrayShadow: return "sampler2DArrayShadow"; break;
      case EbtStruct:               return "structure";            break;
      case EbtInterfaceBlock:       return "interface block";      break;
      default: UNREACHABLE();       return "unknown type";
    }
}

TType::TType(const TPublicType &p)
    : type(p.type), precision(p.precision), qualifier(p.qualifier), layoutQualifier(p.layoutQualifier),
      primarySize(p.primarySize), secondarySize(p.secondarySize), array(p.array), arraySize(p.arraySize),
      interfaceBlock(0), structure(0)
{
    if (p.userDef)
        structure = p.userDef->getStruct();
}

bool TStructure::equals(const TStructure &other) const
{
    return (uniqueId() == other.uniqueId());
}

//
// Recursively generate mangled names.
//
TString TType::buildMangledName() const
{
    TString mangledName;
    if (isMatrix())
        mangledName += 'm';
    else if (isVector())
        mangledName += 'v';

    switch (type)
    {
      case EbtFloat:
        mangledName += 'f';
        break;
      case EbtInt:
        mangledName += 'i';
        break;
      case EbtUInt:
        mangledName += 'u';
        break;
      case EbtBool:
        mangledName += 'b';
        break;
      case EbtSampler2D:
        mangledName += "s2";
        break;
      case EbtSampler3D:
        mangledName += "s3";
        break;
      case EbtSamplerCube:
        mangledName += "sC";
        break;
      case EbtSampler2DArray:
        mangledName += "s2a";
        break;
      case EbtSamplerExternalOES:
        mangledName += "sext";
        break;
      case EbtSampler2DRect:
        mangledName += "s2r";
        break;
      case EbtISampler2D:
        mangledName += "is2";
        break;
      case EbtISampler3D:
        mangledName += "is3";
        break;
      case EbtISamplerCube:
        mangledName += "isC";
        break;
      case EbtISampler2DArray:
        mangledName += "is2a";
        break;
      case EbtUSampler2D:
        mangledName += "us2";
        break;
      case EbtUSampler3D:
        mangledName += "us3";
        break;
      case EbtUSamplerCube:
        mangledName += "usC";
        break;
      case EbtUSampler2DArray:
        mangledName += "us2a";
        break;
      case EbtSampler2DShadow:
        mangledName += "s2s";
        break;
      case EbtSamplerCubeShadow:
        mangledName += "sCs";
        break;
      case EbtSampler2DArrayShadow:
        mangledName += "s2as";
        break;
      case EbtStruct:
        mangledName += structure->mangledName();
        break;
      case EbtInterfaceBlock:
        mangledName += interfaceBlock->mangledName();
        break;
      default:
        UNREACHABLE();
    }

    if (isMatrix())
    {
        mangledName += static_cast<char>('0' + getCols());
        mangledName += static_cast<char>('x');
        mangledName += static_cast<char>('0' + getRows());
    }
    else
    {
        mangledName += static_cast<char>('0' + getNominalSize());
    }

    if (isArray())
    {
        char buf[20];
        snprintf(buf, sizeof(buf), "%d", arraySize);
        mangledName += '[';
        mangledName += buf;
        mangledName += ']';
    }
    return mangledName;
}

size_t TType::getObjectSize() const
{
    size_t totalSize;

    if (getBasicType() == EbtStruct)
        totalSize = structure->objectSize();
    else
        totalSize = primarySize * secondarySize;

    if (isArray())
    {
        // TODO: getArraySize() returns an int, not a size_t
        size_t currentArraySize = getArraySize();
        if (currentArraySize > INT_MAX / totalSize)
            totalSize = INT_MAX;
        else
            totalSize *= currentArraySize;
    }

    return totalSize;
}

bool TStructure::containsArrays() const
{
    for (size_t i = 0; i < mFields->size(); ++i)
    {
        const TType *fieldType = (*mFields)[i]->type();
        if (fieldType->isArray() || fieldType->isStructureContainingArrays())
            return true;
    }
    return false;
}

bool TStructure::containsSamplers() const
{
    for (size_t i = 0; i < mFields->size(); ++i)
    {
        const TType *fieldType = (*mFields)[i]->type();
        if (IsSampler(fieldType->getBasicType()) || fieldType->isStructureContainingSamplers())
            return true;
    }
    return false;
}

TString TFieldListCollection::buildMangledName() const
{
    TString mangledName(mangledNamePrefix());
    mangledName += *mName;
    for (size_t i = 0; i < mFields->size(); ++i)
    {
        mangledName += '-';
        mangledName += (*mFields)[i]->type()->getMangledName();
    }
    return mangledName;
}

size_t TFieldListCollection::calculateObjectSize() const
{
    size_t size = 0;
    for (size_t i = 0; i < mFields->size(); ++i)
    {
        size_t fieldSize = (*mFields)[i]->type()->getObjectSize();
        if (fieldSize > INT_MAX - size)
            size = INT_MAX;
        else
            size += fieldSize;
    }
    return size;
}

int TStructure::calculateDeepestNesting() const
{
    int maxNesting = 0;
    for (size_t i = 0; i < mFields->size(); ++i)
        maxNesting = std::max(maxNesting, (*mFields)[i]->type()->getDeepestStructNesting());
    return 1 + maxNesting;
}