src/scriptvm/tree.cpp

/*
 * Copyright (c) 2014 - 2019 Christian Schoenebeck and Andreas Persson
 *
 * http://www.linuxsampler.org
 *
 * This file is part of LinuxSampler and released under the same terms.
 * See README file for details.
 */

#include <cstdio>
#include <string.h>
#include "tree.h"
#include "../common/global_private.h"
#include <assert.h>

namespace LinuxSampler {
    
bool isNoOperation(StatementRef statement) {
    return statement->statementType() == STMT_NOOP;
}
    
Node::Node() {
}

Node::~Node() {
}

void Node::printIndents(int n) {
    for (int i = 0; i < n; ++i) printf("  ");
    fflush(stdout);
}

String IntExpr::evalCastToStr() {
    return ToString(evalInt());
}

String IntArrayExpr::evalCastToStr() {
    String s = "{";
    for (vmint i = 0; i < arraySize(); ++i) {
        vmint val = evalIntElement(i);
        if (i) s += ",";
        s += ToString(val);
    }
    s += "}";
    return s;
}

MetricPrefix_t Unit::unitPrefix(vmuint i) const {
    if (i >= prefix.size()) return VM_NO_PREFIX;
    return prefix[i];
}

void Unit::setUnit(const std::vector<MetricPrefix_t>& prefix, StdUnit_t type) {
    this->prefix.resize( prefix.size() );
    for (vmuint i = 0; i < prefix.size(); ++i)
        this->prefix[i] = prefix[i];

    unit = type;
}

void Unit::setUnit(const MetricPrefix_t* prefixes, StdUnit_t type) {
    unit = type;
    prefix.clear();
    for (int i = 0; i < 2 && prefixes[i]; ++i)
        prefix.add(prefixes[i]);
}

void Unit::copyUnitFrom(const IntExprRef& src) {
    unit = src->unitType();
    prefix.clear();
    for (int i = 0; true; ++i) {
        MetricPrefix_t p = src->unitPrefix(i);
        if (!p) return;
        prefix.add(p);
    }
}

vmint IntLiteral::evalInt() {
    return value;
}

void IntLiteral::dump(int level) {
    printIndents(level);
    printf("IntLiteral %lld\n", value);
}

void StringLiteral::dump(int level) {
    printIndents(level);
    printf("StringLiteral: '%s'\n", value.c_str());
}

vmint Add::evalInt() {
    IntExpr* pLHS = dynamic_cast<IntExpr*>(&*lhs);
    IntExpr* pRHS = dynamic_cast<IntExpr*>(&*rhs);;
    return (pLHS && pRHS) ? pLHS->evalInt() + pRHS->evalInt() : 0;
}

void Add::dump(int level) {
    printIndents(level);
    printf("Add(\n");
    lhs->dump(level+1);
    printIndents(level);
    printf(",\n");
    rhs->dump(level+1);
    printIndents(level);
    printf(")\n");
}

vmint Sub::evalInt() {
    IntExpr* pLHS = dynamic_cast<IntExpr*>(&*lhs);
    IntExpr* pRHS = dynamic_cast<IntExpr*>(&*rhs);;
    return (pLHS && pRHS) ? pLHS->evalInt() - pRHS->evalInt() : 0;
}

void Sub::dump(int level) {
    printIndents(level);
    printf("Sub(\n");
    lhs->dump(level+1);
    printIndents(level);
    printf(",\n");
    rhs->dump(level+1);
    printIndents(level);
    printf(")\n");
}

vmint Mul::evalInt() {
    IntExpr* pLHS = dynamic_cast<IntExpr*>(&*lhs);
    IntExpr* pRHS = dynamic_cast<IntExpr*>(&*rhs);;
    return (pLHS && pRHS) ? pLHS->evalInt() * pRHS->evalInt() : 0;
}

void Mul::dump(int level) {
    printIndents(level);
    printf("Mul(\n");
    lhs->dump(level+1);
    printIndents(level);
    printf(",\n");
    rhs->dump(level+1);
    printIndents(level);
    printf(")\n");
}

MetricPrefix_t Mul::unitPrefix(vmuint i) const {
    const IntExpr* pLHS = dynamic_cast<const IntExpr*>(&*lhs);
    const IntExpr* pRHS = dynamic_cast<const IntExpr*>(&*rhs);
    // currently the NKSP parser only allows a unit prefix on either side
    return (pLHS->unitPrefix(0)) ? pLHS->unitPrefix(i) : pRHS->unitPrefix(i);
}

StdUnit_t Mul::unitType() const {
    const IntExpr* pLHS = dynamic_cast<const IntExpr*>(&*lhs);
    const IntExpr* pRHS = dynamic_cast<const IntExpr*>(&*rhs);
    // currently the NKSP parser only allows a unit type on either side
    return (pLHS->unitType()) ? pLHS->unitType() : pRHS->unitType();
}

vmint Div::evalInt() {
    IntExpr* pLHS = dynamic_cast<IntExpr*>(&*lhs);
    IntExpr* pRHS = dynamic_cast<IntExpr*>(&*rhs);
    if (!pLHS || !pRHS) return 0;
    vmint l = pLHS->evalInt();
    vmint r = pRHS->evalInt();
    if (r == 0) return 0;
    return l / r;
}

void Div::dump(int level) {
    printIndents(level);
    printf("Div(\n");
    lhs->dump(level+1);
    printIndents(level);
    printf(",\n");
    rhs->dump(level+1);
    printIndents(level);
    printf(")\n");
}

MetricPrefix_t Div::unitPrefix(vmuint i) const {
    const IntExpr* pLHS = dynamic_cast<const IntExpr*>(&*lhs);
    const IntExpr* pRHS = dynamic_cast<const IntExpr*>(&*rhs);
    // currently the NKSP parser only allows either A) a unit prefix on left
    // side and none on right side or B) an identical unit prefix on both sides
    return (pLHS->unitPrefix(0) && pRHS->unitPrefix(0)) ? VM_NO_PREFIX : pLHS->unitPrefix(i);
}

StdUnit_t Div::unitType() const {
    const IntExpr* pLHS = dynamic_cast<const IntExpr*>(&*lhs);
    const IntExpr* pRHS = dynamic_cast<const IntExpr*>(&*rhs);
    // the NKSP parser only allows either A) a unit type on left side and none
    // on right side or B) an identical unit type on both sides
    return (pLHS->unitType() && pRHS->unitType()) ? VM_NO_UNIT : pLHS->unitType();
}

vmint Mod::evalInt() {
    IntExpr* pLHS = dynamic_cast<IntExpr*>(&*lhs);
    IntExpr* pRHS = dynamic_cast<IntExpr*>(&*rhs);;
    return (pLHS && pRHS) ? pLHS->evalInt() % pRHS->evalInt() : 0;
}

void Mod::dump(int level) {
    printIndents(level);
    printf("Mod(\n");
    lhs->dump(level+1);
    printIndents(level);
    printf(",\n");
    rhs->dump(level+1);
    printIndents(level);
    printf(")\n");
}

void Args::dump(int level) {
    printIndents(level);
    printf("Args(\n");
    for (std::vector<ExpressionRef>::iterator it = args.begin() ; it != args.end() ; ++it) {
        (*it)->dump(level+1);
    }
    printIndents(level);
    printf(")\n");
}

bool Args::isPolyphonic() const {
    for (vmint i = 0; i < args.size(); ++i)
        if (args[i]->isPolyphonic())
            return true;
    return false;
}

EventHandlers::EventHandlers() {
    //printf("EventHandlers::Constructor 0x%lx\n", (long long)this);
}

EventHandlers::~EventHandlers() {
}

void EventHandlers::add(EventHandlerRef arg) {
    args.push_back(arg);
}

void EventHandlers::dump(int level) {
    printIndents(level);
    printf("EventHandlers {\n");
    for (std::vector<EventHandlerRef>::iterator it = args.begin() ; it != args.end() ; ++it) {
        (*it)->dump(level+1);
    }
    printIndents(level);
    printf("}\n");
}

EventHandler* EventHandlers::eventHandlerByName(const String& name) const {
    for (vmint i = 0; i < args.size(); ++i)
        if (args.at(i)->eventHandlerName() == name)
            return const_cast<EventHandler*>(&*args.at(i));
    return NULL;
}

EventHandler* EventHandlers::eventHandler(uint index) const {
    if (index >= args.size()) return NULL;
    return const_cast<EventHandler*>(&*args.at(index));
}

bool EventHandlers::isPolyphonic() const {
    for (vmint i = 0; i < args.size(); ++i)
        if (args[i]->isPolyphonic())
            return true;
    return false;
}

Assignment::Assignment(VariableRef variable, ExpressionRef value)
   : variable(variable), value(value)
{
}

void Assignment::dump(int level) {
    printIndents(level);
    printf("Assignment\n");
}

StmtFlags_t Assignment::exec() {
    if (!variable)
        return StmtFlags_t(STMT_ABORT_SIGNALLED | STMT_ERROR_OCCURRED);
    variable->assign(&*value);
    return STMT_SUCCESS;
}

EventHandler::EventHandler(StatementsRef statements) {
    this->statements = statements;
    usingPolyphonics = statements->isPolyphonic();
}

void EventHandler::dump(int level) {
    printIndents(level);
    printf("EventHandler {\n");
    statements->dump(level+1);
    printIndents(level);
    printf("}\n");
}

void Statements::dump(int level) {
    printIndents(level);
    printf("Statements {\n");
    for (std::vector<StatementRef>::iterator it = args.begin() ; it != args.end() ; ++it) {
        (*it)->dump(level+1);
    }
    printIndents(level);
    printf("}\n");
}

Statement* Statements::statement(uint i) {
    if (i >= args.size()) return NULL;
    return &*args.at(i);
}

bool Statements::isPolyphonic() const {
    for (vmint i = 0; i < args.size(); ++i)
        if (args[i]->isPolyphonic())
            return true;
    return false;
}

DynamicVariableCall::DynamicVariableCall(const String& name, ParserContext* ctx, VMDynVar* v)
    : Variable(ctx, 0, false), dynVar(v), varName(name)
{
}

vmint DynamicVariableCall::evalInt() {
    VMIntExpr* expr = dynamic_cast<VMIntExpr*>(dynVar);
    if (!expr) return 0;
    return expr->evalInt();
}

String DynamicVariableCall::evalStr() {
    VMStringExpr* expr = dynamic_cast<VMStringExpr*>(dynVar);
    if (!expr) return "";
    return expr->evalStr();
}

String DynamicVariableCall::evalCastToStr() {
    if (dynVar->exprType() == STRING_EXPR) {
        return evalStr();
    } else {
        VMIntExpr* intExpr = dynamic_cast<VMIntExpr*>(dynVar);
        return intExpr ? ToString(intExpr->evalInt()) : "";
    }
}

void DynamicVariableCall::dump(int level) {
    printIndents(level);
    printf("Dynamic Variable '%s'\n", varName.c_str());
}

void FunctionCall::dump(int level) {
    printIndents(level);
    printf("FunctionCall '%s' args={\n", functionName.c_str());
    args->dump(level+1);
    printIndents(level);
    printf("}\n");
}

ExprType_t FunctionCall::exprType() const {
    if (!fn) return EMPTY_EXPR;
    return fn->returnType();
}

VMFnResult* FunctionCall::execVMFn() {
    if (!fn) return NULL;
    // assuming here that all argument checks (amount and types) have been made
    // at parse time, to avoid time intensive checks on each function call
    return fn->exec(dynamic_cast<VMFnArgs*>(&*args));
}

StmtFlags_t FunctionCall::exec() {
    VMFnResult* result = execVMFn();
    if (!result)
        return StmtFlags_t(STMT_ABORT_SIGNALLED | STMT_ERROR_OCCURRED);
    return result->resultFlags();
}

vmint FunctionCall::evalInt() {
    VMFnResult* result = execVMFn();
    if (!result) return 0;
    VMIntExpr* intExpr = dynamic_cast<VMIntExpr*>(result->resultValue());
    if (!intExpr) return 0;
    return intExpr->evalInt();
}

VMIntArrayExpr* FunctionCall::asIntArray() const {
    VMFnResult* result = const_cast<FunctionCall*>(this)->execVMFn();
    if (!result) return 0;
    VMIntArrayExpr* intArrExpr = dynamic_cast<VMIntArrayExpr*>(result->resultValue());
    return intArrExpr;
}

String FunctionCall::evalStr() {
    VMFnResult* result = execVMFn();
    if (!result) return "";
    VMStringExpr* strExpr = dynamic_cast<VMStringExpr*>(result->resultValue());
    if (!strExpr) return "";
    return strExpr->evalStr();
}

String FunctionCall::evalCastToStr() {
    VMFnResult* result = execVMFn();
    if (!result) return "";
    if (result->resultValue()->exprType() == STRING_EXPR) {
        VMStringExpr* strExpr = dynamic_cast<VMStringExpr*>(result->resultValue());
        return strExpr ? strExpr->evalStr() : "";
    } else {
        VMIntExpr* intExpr = dynamic_cast<VMIntExpr*>(result->resultValue());
        return intExpr ? ToString(intExpr->evalInt()) : "";
    }
}

IntVariable::IntVariable(ParserContext* ctx)
    : Variable(ctx, ctx ? ctx->globalIntVarCount++ : 0, false),
      Unit(),
      polyphonic(false), finalVal(false)
{
    //printf("globalIntVar parserctx=0x%lx memPOS=%d\n", ctx, memPos);
    assert(ctx);
}

inline static vmint postfixInc(vmint& object, vmint incBy) {
    const vmint i = object;
    object += incBy;
    return i;
}

IntVariable::IntVariable(ParserContext* ctx, bool polyphonic, bool bConst, vmint size)
    : Variable(ctx, !ctx ? 0 : polyphonic ? postfixInc(ctx->polyphonicIntVarCount, size) : postfixInc(ctx->globalIntVarCount, size), bConst),
      Unit(),
      polyphonic(polyphonic), finalVal(false)
{
    //printf("InvVar size=%d parserCtx=0x%lx\n", size, (uint64_t)ctx);
    if (polyphonic) {
        //printf("polyIntVar memPOS=%d\n", memPos);
        assert(ctx);
    }
}

void IntVariable::assign(Expression* expr) {
    IntExpr* intExpr = dynamic_cast<IntExpr*>(expr);
    if (intExpr) {
        if (polyphonic)
            context->execContext->polyphonicIntMemory[memPos] = intExpr->evalInt();
        else
            (*context->globalIntMemory)[memPos] = intExpr->evalInt();
    }
}

vmint IntVariable::evalInt() {
    //printf("IntVariable::eval pos=%d\n", memPos);
    if (polyphonic) {
        //printf("evalInt() poly memPos=%d execCtx=0x%lx\n", memPos, (uint64_t)context->execContext);
        return context->execContext->polyphonicIntMemory[memPos];
    }
    return (*context->globalIntMemory)[memPos];
}

void IntVariable::dump(int level) {
    printIndents(level);
    printf("IntVariable\n");
    //printf("IntVariable memPos=%d\n", memPos);
}

//ConstIntVariable::ConstIntVariable(ParserContext* ctx, int value)
ConstIntVariable::ConstIntVariable(vmint value)
    : IntVariable(NULL,false,true), value(value)
{
}

void ConstIntVariable::assign(Expression* expr) {
    // ignore assignment
/*
    printf("ConstIntVariable::assign()\n");
    IntExpr* intExpr = dynamic_cast<IntExpr*>(expr);
    if (intExpr) {
        value = intExpr->evalInt();
    }
*/
}

vmint ConstIntVariable::evalInt() {
    return value;
}

void ConstIntVariable::dump(int level) {
    printIndents(level);
    printf("ConstIntVariable val=%lld\n", value);
}

BuiltInIntVariable::BuiltInIntVariable(const String& name, VMIntPtr* ptr)
    : IntVariable(NULL,false,false), name(name), ptr(ptr)
{
}

void BuiltInIntVariable::assign(Expression* expr) {
    IntExpr* valueExpr = dynamic_cast<IntExpr*>(expr);
    if (!valueExpr) return;
    ptr->assign(valueExpr->evalInt());
}

vmint BuiltInIntVariable::evalInt() {
    return ptr->evalInt();
}

void BuiltInIntVariable::dump(int level) {
    printIndents(level);
    printf("Built-in IntVar '%s'\n", name.c_str());
}

PolyphonicIntVariable::PolyphonicIntVariable(ParserContext* ctx)
    : IntVariable(ctx,true,false)
{
}

void PolyphonicIntVariable::dump(int level) {
    printIndents(level);
    printf("PolyphonicIntVariable\n");
}

IntArrayVariable::IntArrayVariable(ParserContext* ctx, vmint size)
    : Variable(ctx, 0, false)
{
    values.resize(size);
    memset(&values[0], 0, size * sizeof(vmint));
}

IntArrayVariable::IntArrayVariable(ParserContext* ctx, vmint size, ArgsRef values, bool _bConst)
    : Variable(ctx, 0, _bConst)
{
    this->values.resize(size);
    for (vmint i = 0; i < values->argsCount(); ++i) {
        VMIntExpr* expr = dynamic_cast<VMIntExpr*>(values->arg(i));
        if (expr) this->values[i] = expr->evalInt();
    }
}

IntArrayVariable::IntArrayVariable(ParserContext* ctx, bool bConst)
    : Variable(ctx, 0, bConst)
{
}

vmint IntArrayVariable::evalIntElement(vmuint i) {
    if (i >= values.size()) return 0;
    return values[i];
}

void IntArrayVariable::assignIntElement(vmuint i, vmint value) {
    if (i >= values.size()) return;
    values[i] = value;
}

void IntArrayVariable::dump(int level) {
    printIndents(level);
    printf("IntArray(");
    for (vmint i = 0; i < values.size(); ++i) {
        if (i % 12 == 0) {
            printf("\n");
            printIndents(level+1);
        }
        printf("%lld, ", values[i]);
    }
    printIndents(level);
    printf(")\n");
}

BuiltInIntArrayVariable::BuiltInIntArrayVariable(const String& name, VMInt8Array* array)
    : IntArrayVariable(NULL, false), name(name), array(array)
{
}

vmint BuiltInIntArrayVariable::evalIntElement(vmuint i) {
    return i >= array->size ? 0 : array->data[i];
}

void BuiltInIntArrayVariable::assignIntElement(vmuint i, vmint value) {
    if (i >= array->size) return;
    array->data[i] = value;
}

void BuiltInIntArrayVariable::dump(int level) {
    printIndents(level);
    printf("Built-In Int Array Variable '%s'\n", name.c_str());
}

IntArrayElement::IntArrayElement(IntArrayExprRef array, IntExprRef arrayIndex)
    : IntVariable(NULL, false, false, 0), array(array), index(arrayIndex)
{    
}

void IntArrayElement::assign(Expression* expr) {
    IntExpr* valueExpr = dynamic_cast<IntExpr*>(expr);
    if (!valueExpr) return;
    vmint value = valueExpr->evalInt();

    if (!index) return;
    vmint idx = index->evalInt();
    if (idx < 0 || idx >= array->arraySize()) return;

    array->assignIntElement(idx, value);
}

vmint IntArrayElement::evalInt() {
    if (!index) return 0;
    vmint idx = index->evalInt();
    if (idx < 0 || idx >= array->arraySize()) return 0;

    return array->evalIntElement(idx);
}

void IntArrayElement::dump(int level) {
    printIndents(level);
    printf("IntArrayElement\n");
}

StringVariable::StringVariable(ParserContext* ctx)
    : Variable(ctx,ctx->globalStrVarCount++,false)
{
}

StringVariable::StringVariable(ParserContext* ctx, bool bConst)
    : Variable(ctx,0,bConst)
{
}

void StringVariable::assign(Expression* expr) {
    StringExpr* strExpr = dynamic_cast<StringExpr*>(expr);
    (*context->globalStrMemory)[memPos] = strExpr->evalStr();
}

String StringVariable::evalStr() {
    //printf("StringVariable::eval pos=%d\n", memPos);
    return (*context->globalStrMemory)[memPos];
}

void StringVariable::dump(int level) {
    printIndents(level);
    printf("StringVariable memPos=%lld\n", memPos);
}

ConstStringVariable::ConstStringVariable(ParserContext* ctx, String _value)
    : StringVariable(ctx,true), value(_value)
{
}

void ConstStringVariable::assign(Expression* expr) {
    // ignore assignment
//     StringExpr* strExpr = dynamic_cast<StringExpr*>(expr);
//     if (strExpr) value = strExpr->evalStr();
}

String ConstStringVariable::evalStr() {
    return value;
}

void ConstStringVariable::dump(int level) {
    printIndents(level);
    printf("ConstStringVariable val='%s'\n", value.c_str());
}

MetricPrefix_t IntBinaryOp::unitPrefix(vmuint i) const {
    IntExprRef l = (IntExprRef) lhs;
    IntExprRef r = (IntExprRef) rhs;
    return (r->unitFactor() < l->unitFactor()) ? r->unitPrefix(i) : l->unitPrefix(i);
}

StdUnit_t IntBinaryOp::unitType() const {
    IntExprRef l = (IntExprRef) lhs;
    IntExprRef r = (IntExprRef) rhs;
    return (l->unitType()) ? l->unitType() : r->unitType();
}

bool IntBinaryOp::isFinal() const {
    IntExprRef l = (IntExprRef) lhs;
    IntExprRef r = (IntExprRef) rhs;
    return l->isFinal() || r->isFinal();
}

void If::dump(int level) {
    printIndents(level);
    if (ifStatements && elseStatements)
        printf("if cond stmts1 else stmts2 end if\n");
    else if (ifStatements)
        printf("if cond statements end if\n");
    else
        printf("if [INVALID]\n");
}

vmint If::evalBranch() {
    if (condition->evalInt()) return 0;
    if (elseStatements) return 1;
    return -1;
}

Statements* If::branch(vmuint i) const {
    if (i == 0) return (Statements*) &*ifStatements;
    if (i == 1) return (elseStatements) ? (Statements*) &*elseStatements : NULL;
    return NULL;
}

bool If::isPolyphonic() const {
    if (condition->isPolyphonic() || ifStatements->isPolyphonic())
        return true;
    return elseStatements ? elseStatements->isPolyphonic() : false;
}

void SelectCase::dump(int level) {
    printIndents(level);
    if (select)
        if (select->isConstExpr())
            printf("Case select %lld\n", select->evalInt());
        else
            printf("Case select [runtime expr]\n");
    else
        printf("Case select NULL\n");
    for (vmint i = 0; i < branches.size(); ++i) {
        printIndents(level+1);
        CaseBranch& branch = branches[i];
        if (branch.from && branch.to)
            if (branch.from->isConstExpr() && branch.to->isConstExpr())
                printf("case %lld to %lld\n", branch.from->evalInt(), branch.to->evalInt());
            else if (branch.from->isConstExpr() && !branch.to->isConstExpr())
                printf("case %lld to [runtime expr]\n", branch.from->evalInt());
            else if (!branch.from->isConstExpr() && branch.to->isConstExpr())
                printf("case [runtime expr] to %lld\n", branch.to->evalInt());
            else
                printf("case [runtime expr] to [runtime expr]\n");
        else if (branch.from)
            if (branch.from->isConstExpr())
                printf("case %lld\n", branch.from->evalInt());
            else
                printf("case [runtime expr]\n");
        else
            printf("case NULL\n");
    }
}

vmint SelectCase::evalBranch() {
    vmint value = select->evalInt();
    for (vmint i = 0; i < branches.size(); ++i) {
        if (branches.at(i).from && branches.at(i).to) { // i.e. "case 4 to 7" ...
            if (branches.at(i).from->evalInt() <= value &&
                branches.at(i).to->evalInt() >= value) return i;
        } else { // i.e. "case 5" ...
            if (branches.at(i).from->evalInt() == value) return i;
        }
    }
    return -1;
}

Statements* SelectCase::branch(vmuint i) const {
    if (i < branches.size())
        return const_cast<Statements*>( &*branches[i].statements );
    return NULL;
}

bool SelectCase::isPolyphonic() const {
    if (select->isPolyphonic()) return true;
    for (vmint i = 0; i < branches.size(); ++i)
        if (branches[i].statements->isPolyphonic())
            return true;
    return false;
}

// void Case::addBranch(IntExprRef condition, StatementsRef statements) {
//     CaseBranchRef b = new CaseBranchRef;
//     b->from = condition;
//     b->statements = statements;
//     branches.push_back(b);
// }
// 
// void Case::addBranch(IntExprRef from, IntExprRef to, StatementsRef statements) {
//     CaseBranchRef b = new CaseBranchRef;
//     b->from = from;
//     b->to   = to;
//     b->statements = statements;
//     branches.push_back(b);
// }
// 
// void Case::addBranch(CaseBranchRef branch) {
//     branches.push_back(branch);
// }

void While::dump(int level) {
    printIndents(level);
    if (m_condition)
        if (m_condition->isConstExpr())
            printf("while (%lld) {\n", m_condition->evalInt());
        else
            printf("while ([runtime expr]) {\n");
    else
        printf("while ([INVALID]) {\n");
    m_statements->dump(level+1);
    printIndents(level);
    printf("}\n");
}

Statements* While::statements() const {
    return (m_statements) ? const_cast<Statements*>( &*m_statements ) : NULL;
}

bool While::evalLoopStartCondition() {
    if (!m_condition) return false;
    return m_condition->evalInt();
}

void SyncBlock::dump(int level) {
    printIndents(level);
    printf("sync {\n");
    m_statements->dump(level+1);
    printIndents(level);
    printf("}\n");
}

Statements* SyncBlock::statements() const {
    return (m_statements) ? const_cast<Statements*>( &*m_statements ) : NULL;
}

void Neg::dump(int level) {
    printIndents(level);
    printf("Negative Expr\n");
}

String ConcatString::evalStr() {
    // temporaries required here to enforce the associative left (to right) order
    // ( required for GCC and Visual Studio, see:
    //   http://stackoverflow.com/questions/25842902/why-stdstring-concatenation-operator-works-like-right-associative-one
    //   Personally I am not convinced that this is "not a bug" of the
    //   compiler/STL implementation and the allegedly underlying "function call"
    //   nature causing this is IMO no profound reason that the C++ language's
    //   "+" operator's left associativity is ignored. -- Christian, 2016-07-14 )
    String l = lhs->evalCastToStr();
    String r = rhs->evalCastToStr();
    return l + r;
}

void ConcatString::dump(int level) {
    printIndents(level);
    printf("ConcatString(\n");
    lhs->dump(level+1);
    printIndents(level);
    printf(",\n");
    rhs->dump(level+1);
    printIndents(level);
    printf(")");
}

bool ConcatString::isConstExpr() const {
    return lhs->isConstExpr() && rhs->isConstExpr();
}

vmint Relation::evalInt() {
    switch (type) {
        case LESS_THAN:
            return lhs->evalInt() < rhs->evalInt();
        case GREATER_THAN:
            return lhs->evalInt() > rhs->evalInt();
        case LESS_OR_EQUAL:
            return lhs->evalInt() <= rhs->evalInt();
        case GREATER_OR_EQUAL:
            return lhs->evalInt() >= rhs->evalInt();
        case EQUAL:
            if (lhs->exprType() == STRING_EXPR || rhs->exprType() == STRING_EXPR)
                return lhs->evalCastToStr() == rhs->evalCastToStr();
            else
                return lhs->evalInt() == rhs->evalInt();
        case NOT_EQUAL:
            if (lhs->exprType() == STRING_EXPR || rhs->exprType() == STRING_EXPR)
                return lhs->evalCastToStr() != rhs->evalCastToStr();
            else
                return lhs->evalInt() != rhs->evalInt();
    }
    return 0;
}

void Relation::dump(int level) {
    printIndents(level);
    printf("Relation(\n");
    lhs->dump(level+1);
    printIndents(level);
    switch (type) {
        case LESS_THAN:
            printf("LESS_THAN\n");
            break;
        case GREATER_THAN:
            printf("GREATER_THAN\n");
            break;
        case LESS_OR_EQUAL:
            printf("LESS_OR_EQUAL\n");
            break;
        case GREATER_OR_EQUAL:
            printf("GREATER_OR_EQUAL\n");
            break;
        case EQUAL:
            printf("EQUAL\n");
            break;
        case NOT_EQUAL:
            printf("NOT_EQUAL\n");
            break;
    }
    rhs->dump(level+1);
    printIndents(level);
    printf(")\n");
}

bool Relation::isConstExpr() const {
    return lhs->isConstExpr() && rhs->isConstExpr();
}

vmint Or::evalInt() {
    IntExpr* pLHS = dynamic_cast<IntExpr*>(&*lhs);
    if (pLHS->evalInt()) return 1;
    IntExpr* pRHS = dynamic_cast<IntExpr*>(&*rhs);;
    return (pRHS->evalInt()) ? 1 : 0;
}

void Or::dump(int level) {
    printIndents(level);
    printf("Or(\n");
    lhs->dump(level+1);
    printIndents(level);
    printf(",\n");
    rhs->dump(level+1);
    printIndents(level);
    printf(")\n");
}

vmint BitwiseOr::evalInt() {
    IntExpr* pLHS = dynamic_cast<IntExpr*>(&*lhs);
    IntExpr* pRHS = dynamic_cast<IntExpr*>(&*rhs);
    return pLHS->evalInt() | pRHS->evalInt();
}

void BitwiseOr::dump(int level) {
    printIndents(level);
    printf("BitwiseOr(\n");
    lhs->dump(level+1);
    printIndents(level);
    printf(",\n");
    rhs->dump(level+1);
    printIndents(level);
    printf(")\n");
}

vmint And::evalInt() {
    IntExpr* pLHS = dynamic_cast<IntExpr*>(&*lhs);
    if (!pLHS->evalInt()) return 0;
    IntExpr* pRHS = dynamic_cast<IntExpr*>(&*rhs);
    return (pRHS->evalInt()) ? 1 : 0;
}

void And::dump(int level) {
    printIndents(level);
    printf("And(\n");
    lhs->dump(level+1);
    printIndents(level);
    printf(",\n");
    rhs->dump(level+1);
    printIndents(level);
    printf(")\n");
}

vmint BitwiseAnd::evalInt() {
    IntExpr* pLHS = dynamic_cast<IntExpr*>(&*lhs);
    IntExpr* pRHS = dynamic_cast<IntExpr*>(&*rhs);
    return pLHS->evalInt() & pRHS->evalInt();
}

void BitwiseAnd::dump(int level) {
    printIndents(level);
    printf("BitwiseAnd(\n");
    lhs->dump(level+1);
    printIndents(level);
    printf(",\n");
    rhs->dump(level+1);
    printIndents(level);
    printf(")\n");
}

void Not::dump(int level) {
    printIndents(level);
    printf("Not(\n");
    expr->dump(level+1);
    printIndents(level);
    printf(")\n");
}

void BitwiseNot::dump(int level) {
    printIndents(level);
    printf("BitwiseNot(\n");
    expr->dump(level+1);
    printIndents(level);
    printf(")\n");
}

void Final::dump(int level) {
    printIndents(level);
    printf("Final(\n");
    expr->dump(level+1);
    printIndents(level);
    printf(")\n");
}

StatementsRef ParserContext::userFunctionByName(const String& name) {
    if (!userFnTable.count(name)) {
        return StatementsRef();
    }
    return userFnTable.find(name)->second;
}

VariableRef ParserContext::variableByName(const String& name) {
    if (!vartable.count(name)) {
        return VariableRef();
    }
    return vartable.find(name)->second;
}

VariableRef ParserContext::globalVar(const String& name) {
    if (!vartable.count(name)) {
        //printf("No global var '%s'\n", name.c_str());
        //for (std::map<String,VariableRef>::const_iterator it = vartable.begin(); it != vartable.end(); ++it)
        //    printf("-> var '%s'\n", it->first.c_str());
        return VariableRef();
    }
    return vartable.find(name)->second;
}

IntVariableRef ParserContext::globalIntVar(const String& name) {
    return globalVar(name);
}

StringVariableRef ParserContext::globalStrVar(const String& name) {
    return globalVar(name);
}

ParserContext::~ParserContext() {
    destroyScanner();
    if (globalIntMemory) {
        delete globalIntMemory;
        globalIntMemory = NULL;
    }
}

void ParserContext::addErr(int firstLine, int lastLine, int firstColumn, int lastColumn, const char* txt) {
    ParserIssue e;
    e.type = PARSER_ERROR;
    e.txt = txt;
    e.firstLine = firstLine;
    e.lastLine = lastLine;
    e.firstColumn = firstColumn;
    e.lastColumn = lastColumn;
    vErrors.push_back(e);
    vIssues.push_back(e);
}

void ParserContext::addWrn(int firstLine, int lastLine, int firstColumn, int lastColumn, const char* txt) {
    ParserIssue w;
    w.type = PARSER_WARNING;
    w.txt = txt;
    w.firstLine = firstLine;
    w.lastLine = lastLine;
    w.firstColumn = firstColumn;
    w.lastColumn = lastColumn;
    vWarnings.push_back(w);
    vIssues.push_back(w);
}

void ParserContext::addPreprocessorComment(int firstLine, int lastLine, int firstColumn, int lastColumn) {
    CodeBlock block;
    block.firstLine = firstLine;
    block.lastLine = lastLine;
    block.firstColumn = firstColumn;
    block.lastColumn = lastColumn;
    vPreprocessorComments.push_back(block);
}

bool ParserContext::setPreprocessorCondition(const char* name) {
    if (builtinPreprocessorConditions.count(name)) return false;
    if (userPreprocessorConditions.count(name)) return false;
    userPreprocessorConditions.insert(name);
    return true;
}

bool ParserContext::resetPreprocessorCondition(const char* name) {
    if (builtinPreprocessorConditions.count(name)) return false;
    if (!userPreprocessorConditions.count(name)) return false;
    userPreprocessorConditions.erase(name);
    return true;
}

bool ParserContext::isPreprocessorConditionSet(const char* name) {
    if (builtinPreprocessorConditions.count(name)) return true;
    return userPreprocessorConditions.count(name);
}

std::vector<ParserIssue> ParserContext::issues() const {
    return vIssues;
}

std::vector<ParserIssue> ParserContext::errors() const {
    return vErrors;
}

std::vector<ParserIssue> ParserContext::warnings() const {
    return vWarnings;
}

std::vector<CodeBlock> ParserContext::preprocessorComments() const {
    return vPreprocessorComments;
}

VMEventHandler* ParserContext::eventHandler(uint index) {
    if (!handlers) return NULL;
    return handlers->eventHandler(index);
}

VMEventHandler* ParserContext::eventHandlerByName(const String& name) {
    if (!handlers) return NULL;
    return handlers->eventHandlerByName(name);
}

void ParserContext::registerBuiltInConstIntVariables(const std::map<String,vmint>& vars) {
    for (std::map<String,vmint>::const_iterator it = vars.begin();
         it != vars.end(); ++it)
    {
        ConstIntVariableRef ref = new ConstIntVariable(it->second);
        vartable[it->first] = ref;
    }
}

void ParserContext::registerBuiltInIntVariables(const std::map<String,VMIntPtr*>& vars) {
    for (std::map<String,VMIntPtr*>::const_iterator it = vars.begin();
         it != vars.end(); ++it)
    {
        BuiltInIntVariableRef ref = new BuiltInIntVariable(it->first, it->second);
        vartable[it->first] = ref;
    }
}

void ParserContext::registerBuiltInIntArrayVariables(const std::map<String,VMInt8Array*>& vars) {
    for (std::map<String,VMInt8Array*>::const_iterator it = vars.begin();
         it != vars.end(); ++it)
    {
        BuiltInIntArrayVariableRef ref = new BuiltInIntArrayVariable(it->first, it->second);
        vartable[it->first] = ref;
    }
}

void ParserContext::registerBuiltInDynVariables(const std::map<String,VMDynVar*>& vars) {
    for (std::map<String,VMDynVar*>::const_iterator it = vars.begin();
         it != vars.end(); ++it)
    {
        DynamicVariableCallRef ref = new DynamicVariableCall(it->first, this, it->second);
        vartable[it->first] = ref;
    }
}

ExecContext::ExecContext() :
    status(VM_EXEC_NOT_RUNNING), flags(STMT_SUCCESS), stackFrame(-1),
    suspendMicroseconds(0), instructionsCount(0)
{
    exitRes.value = NULL;
}

void ExecContext::forkTo(VMExecContext* ectx) const {
    ExecContext* child = dynamic_cast<ExecContext*>(ectx);

    child->polyphonicIntMemory.copyFlatFrom(polyphonicIntMemory);
    child->status = VM_EXEC_SUSPENDED;
    child->flags = STMT_SUCCESS;
    child->stack.copyFlatFrom(stack);
    child->stackFrame = stackFrame;
    child->suspendMicroseconds = 0;
    child->instructionsCount = 0;
}

} // namespace LinuxSampler