//
// Copyright (c) 2002-2012 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.
//

//
// Symbol table for parsing.  Most functionaliy and main ideas
// are documented in the header file.
//

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

#include "compiler/SymbolTable.h"

#include <stdio.h>
#include <algorithm>
#include <climits>

TType::TType(const TPublicType &p) :
            type(p.type), precision(p.precision), qualifier(p.qualifier), size(p.size), matrix(p.matrix), array(p.array), arraySize(p.arraySize),
            maxArraySize(0), arrayInformationType(0), structure(0), structureSize(0), deepestStructNesting(0), fieldName(0), mangled(0), typeName(0)
{
    if (p.userDef) {
        structure = p.userDef->getStruct();
        typeName = NewPoolTString(p.userDef->getTypeName().c_str());
        computeDeepestStructNesting();
    }
}

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

    switch (type) {
    case EbtFloat:              mangledName += 'f';      break;
    case EbtInt:                mangledName += 'i';      break;
    case EbtBool:               mangledName += 'b';      break;
    case EbtSampler2D:          mangledName += "s2";     break;
    case EbtSamplerCube:        mangledName += "sC";     break;
    case EbtStruct:
        mangledName += "struct-";
        if (typeName)
            mangledName += *typeName;
        {// support MSVC++6.0
            for (unsigned int i = 0; i < structure->size(); ++i) {
                mangledName += '-';
                (*structure)[i]->buildMangledName(mangledName);
            }
        }
    default:
        break;
    }

    mangledName += static_cast<char>('0' + getNominalSize());
    if (isArray()) {
        char buf[20];
        snprintf(buf, sizeof(buf), "%d", arraySize);
        mangledName += '[';
        mangledName += buf;
        mangledName += ']';
    }
}

size_t TType::getObjectSize() const
{
    size_t totalSize = 0;

    if (getBasicType() == EbtStruct)
        totalSize = getStructSize();
    else if (matrix)
        totalSize = size * size;
    else
        totalSize = size;

    if (isArray()) {
        size_t arraySize = std::max(getArraySize(), getMaxArraySize());
        if (arraySize > INT_MAX / totalSize)
            totalSize = INT_MAX;
        else
            totalSize *= arraySize;
    }

    return totalSize;
}

size_t TType::getStructSize() const
{
    if (!getStruct()) {
        assert(false && "Not a struct");
        return 0;
    }

    if (structureSize == 0) {
        for (TTypeList::const_iterator tl = getStruct()->begin(); tl != getStruct()->end(); tl++) {
            size_t fieldSize = (*tl)->getObjectSize();
            if (fieldSize > INT_MAX - structureSize)
                structureSize = INT_MAX;
            else
                structureSize += fieldSize;
        }
    }

    return structureSize;
}

void TType::computeDeepestStructNesting()
{
    if (!getStruct()) {
        return;
    }

    int maxNesting = 0;
    for (TTypeList::const_iterator tl = getStruct()->begin(); tl != getStruct()->end(); ++tl) {
        maxNesting = std::max(maxNesting, (*tl)->getDeepestStructNesting());
    }

    deepestStructNesting = 1 + maxNesting;
}

bool TType::isStructureContainingArrays() const
{
    if (!structure)
    {
        return false;
    }

    for (TTypeList::const_iterator member = structure->begin(); member != structure->end(); member++)
    {
        if ((*member)->isArray() ||
            (*member)->isStructureContainingArrays())
        {
            return true;
        }
    }

    return false;
}

//
// Dump functions.
//

void TVariable::dump(TInfoSink& infoSink) const
{
    infoSink.debug << getName().c_str() << ": " << type.getQualifierString() << " " << type.getPrecisionString() << " " << type.getBasicString();
    if (type.isArray()) {
        infoSink.debug << "[0]";
    }
    infoSink.debug << "\n";
}

void TFunction::dump(TInfoSink &infoSink) const
{
    infoSink.debug << getName().c_str() << ": " <<  returnType.getBasicString() << " " << getMangledName().c_str() << "\n";
}

void TSymbolTableLevel::dump(TInfoSink &infoSink) const
{
    tLevel::const_iterator it;
    for (it = level.begin(); it != level.end(); ++it)
        (*it).second->dump(infoSink);
}

void TSymbolTable::dump(TInfoSink &infoSink) const
{
    for (int level = currentLevel(); level >= 0; --level) {
        infoSink.debug << "LEVEL " << level << "\n";
        table[level]->dump(infoSink);
    }
}

//
// Functions have buried pointers to delete.
//
TFunction::~TFunction()
{
    for (TParamList::iterator i = parameters.begin(); i != parameters.end(); ++i)
        delete (*i).type;
}

//
// Symbol table levels are a map of pointers to symbols that have to be deleted.
//
TSymbolTableLevel::~TSymbolTableLevel()
{
    for (tLevel::iterator it = level.begin(); it != level.end(); ++it)
        delete (*it).second;
}

//
// Change all function entries in the table with the non-mangled name
// to be related to the provided built-in operation.  This is a low
// performance operation, and only intended for symbol tables that
// live across a large number of compiles.
//
void TSymbolTableLevel::relateToOperator(const char* name, TOperator op)
{
    tLevel::iterator it;
    for (it = level.begin(); it != level.end(); ++it) {
        if ((*it).second->isFunction()) {
            TFunction* function = static_cast<TFunction*>((*it).second);
            if (function->getName() == name)
                function->relateToOperator(op);
        }
    }
}

//
// Change all function entries in the table with the non-mangled name
// to be related to the provided built-in extension. This is a low
// performance operation, and only intended for symbol tables that
// live across a large number of compiles.
//
void TSymbolTableLevel::relateToExtension(const char* name, const TString& ext)
{
    for (tLevel::iterator it = level.begin(); it != level.end(); ++it) {
        if (it->second->isFunction()) {
            TFunction* function = static_cast<TFunction*>(it->second);
            if (function->getName() == name)
                function->relateToExtension(ext);
        }
    }
}