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ast.cpp
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// Copyright 2018 LPC Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "ast.h"
#include "compilationContext.h"
#include "symbols.h"
#include "_parser.h"
#include "types.h"
namespace ast
{
///////////////////////////////////////////////////////////////////////////////
//
VarPtr ConstExpr::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr Intrinsic::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr VarExpr::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr ParamExpr::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr FuncPtr::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr TypeCast::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr BinaryOp::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr UnaryOp::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr ArrayIndex::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr FieldExpr::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr Indirection::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr FuncCall::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr Set::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr WriteArgExpr::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr NopStm::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr CompoundStm::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr IfStm::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr CaseStm::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr AssignStm::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr WhileStm::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr RepeatStm::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr ForStm::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr GotoStm::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
VarPtr ProcCallStm::accept(Visitor* pVisitor) const { return pVisitor->visit(this); }
///////////////////////////////////////////////////////////////////////////////
//
static
Expr* castExpr(Expr* pValue, ts::Type* pDstType)
{
return pValue->pType->isSameType(pDstType) ? pValue :
new TypeCast(pValue, pDstType, TypeCast::ctxExpression, pValue->line);
}
///////////////////////////////////////////////////////////////////////////////
//
BinaryOp::BinaryOp(Expr* pLeft, Token* pOperator, Expr* pRight, int line) :
Expr(line), pLeft(pLeft), pOperator(pOperator), pRight(pRight)
{
auto pLT = pLeft->pType;
auto pRT = pRight->pType;
if(pLT->isDummy() || pRT->isDummy())
{
pType = new ts::DummyType(pOperator->line);
return;
}
ts::Type* pResultType = nullptr;
switch(pOperator->token)
{
case Parser::T_PLUS:
case Parser::T_MINUS:
case Parser::T_STAR:
if(pLT->isSet() && pRT->isSet())
{
auto pLSetType = pLT->as<ts::SetType>();
auto pRSetType = pRT->as<ts::SetType>();
if(pLSetType->elemType()->isCompatible(pRSetType->elemType()))
{
pResultType = pLT->isSameType(pRT) ? pLT : ts::g_pGenericSetType;
}
}
else if(pLT->isInteger() && pRT->isInteger())
pResultType = ts::g_pIntegerType;
else if(pLT->isNumber() && pRT->isNumber())
pResultType = ts::g_pRealType;
break;
case Parser::T_SLASH:
if(pLT->isNumber() && pRT->isNumber())
pResultType = ts::g_pRealType;
break;
case Parser::T_DIV:
case Parser::T_MOD:
if(pLT->isInteger() && pRT->isInteger())
pResultType = ts::g_pIntegerType;
break;
case Parser::T_EQ:
case Parser::T_NE:
case Parser::T_LT:
case Parser::T_GT:
case Parser::T_LE:
case Parser::T_GE:
if(pLT->isCompatible(pRT))
pResultType = ts::g_pBoolType;
break;
case Parser::T_IN:
if(pRT->isA<ts::SetType>() &&
pRT->as<ts::SetType>()->elemType()->isCompatible(pLT))
{
pResultType = ts::g_pBoolType;
}
break;
case Parser::T_OR:
case Parser::T_AND:
if(pLT->isBool() && pRT->isBool())
pResultType = ts::g_pBoolType;
break;
case Parser::T_DOTDOT:
if(pLT->isCompatible(pRT) && pLT->isOrdinal())
{
// NOTE: technically this would be a special 'range' type
// but for our limited use (set constructors) this is fine
//
pResultType = pLT;
}
break;
default:
assert(!"unexpected binary operator");
}
// invalid operands?
//
if (pResultType == nullptr)
{
context()->error(line, "invalid operand types (%s %s %s)",
pLT->typeDef().c_str(), pOperator->name(), pRT->typeDef().c_str());
pResultType = new ts::DummyType(pLT->line());
}
// implicit set type casts?
//
else if(pLT->isSet() && pRT->isSet() && !pLT->isSameType(pRT))
{
this->pLeft = castExpr(pLeft, ts::g_pGenericSetType);
this->pRight = castExpr(pRight, ts::g_pGenericSetType);
}
pType = pResultType;
}
///////////////////////////////////////////////////////////////////////////////
//
UnaryOp::UnaryOp(Token* pOperator, Expr* pExpr, int line) :
Expr(line), pOperator(pOperator), pExpr(pExpr)
{
auto pT = pExpr->pType;
if(pT->isDummy())
{
pType = new ts::DummyType(pOperator->line);
return;
}
ts::Type* pResultType = nullptr;
switch(pOperator->token)
{
case Parser::T_PLUS:
case Parser::T_MINUS:
if(pT->isNumber())
pResultType = pT;
break;
case Parser::T_NOT:
if(pT->isBool())
pResultType = ts::g_pBoolType;
break;
default:
assert(!"unexpected unary operator");
}
if(pResultType == nullptr)
{
context()->error(line, "invalid operand type (%s %s)",
pOperator->name(), pT->typeDef().c_str());
pResultType = new ts::DummyType(pT->line());
}
pType = pResultType;
}
///////////////////////////////////////////////////////////////////////////////
//
ArrayIndex::ArrayIndex(Expr* pArray, const ExprList* pIndexList, int line) :
Expr(line), pObject(nullptr), pIndex(nullptr)
{
assert(!pIndexList->empty());
if(pArray->pType->isDummy())
{
pType = new ts::DummyType(pArray->pType->line());
return;
}
pIndex = pIndexList->back();
pObject = pArray;
// for multi-dimensional arrays recursively index one dimension at a time
//
if(pIndexList->size() > 1)
{
auto pTmpIndexList = new ExprList(*pIndexList);
pTmpIndexList->pop_back();
pObject = new ArrayIndex(pArray, pTmpIndexList, line);
}
auto pArrayType = pObject->pType->as<ts::ArrayType>();
if(pArrayType != nullptr)
{
if(pArrayType->indexType()->canBeAssigned(pIndex->pType))
{
pType = pArrayType->elemType();
}
else
{
context()->error(line,
"invalid indexes for the array subscript operator");
}
}
else
{
context()->error(line,
"too many indexes or subscript applied to a non-array type");
}
if(pType == nullptr)
pType = new ts::DummyType(pArray->pType->line());
}
///////////////////////////////////////////////////////////////////////////////
//
Indirection::Indirection(Expr* pObject, int line) :
Expr(line), pObject(pObject)
{
if(pObject->pType->isDummy())
{
pType = new ts::DummyType(pObject->pType->line());
return;
}
const auto pPtrType = pObject->pType->as<ts::PointerType>();
if(pPtrType != nullptr)
{
pType = pPtrType->baseType();
}
else
{
const auto pFileType = pObject->pType->as<ts::FileType>();
if (pFileType != nullptr)
{
pType = pFileType->elemType();
}
else
{
context()->error(pObject->pType->line(), "indirection requires a pointer or file type");
}
}
if(pType == nullptr)
{
pType = new ts::DummyType(pObject->pType->line());
}
}
///////////////////////////////////////////////////////////////////////////////
//
FieldExpr::FieldExpr(obj::Field* pField, int line) :
Expr(line), pField(pField)
{
const auto pRecType = this->pField->pRecord->pType->as<ts::RecordType>();
const auto& fieldMap = pRecType->fieldMap();
auto it = fieldMap.find(this->pField->pId);
assert(it != fieldMap.end());
pType = it->second;
}
///////////////////////////////////////////////////////////////////////////////
//
FieldExpr::FieldExpr(Expr* pRecord, Identifier* pFieldId, int line) :
Expr(line), pField(nullptr)
{
if(!pRecord->pType->isDummy())
{
const auto pRecType = pRecord->pType->as<ts::RecordType>();
if(pRecType != nullptr)
{
const auto& fieldMap = pRecType->fieldMap();
auto it = fieldMap.find(pFieldId);
if(it != fieldMap.end())
{
pField = new obj::Field(it->first, pRecord);
pType = it->second;
}
else
{
context()->error(line, "there's no field named '%s'", pFieldId->name.c_str());
}
}
else
{
context()->error(line, "left side of the field operator must be a record type");
}
}
// failed to construct a valid FieldExpr?
//
if(pField == nullptr)
{
assert(pType == nullptr);
pField = new obj::Field(pFieldId, pRecord);
pType = new ts::DummyType(line);
}
assert(pType != nullptr);
}
///////////////////////////////////////////////////////////////////////////////
//
Set::Set(ExprList* pValues, int line) :
Expr(line), pValues(pValues)
{
ts::Type* pElemType = ts::g_pIntegerType;
if(pValues != nullptr)
{
pElemType = pValues->front()->pType;
if(pElemType->isA<ts::RangeType>())
pElemType = pElemType->as<ts::RangeType>()->baseType();
for(auto pValue : *pValues)
{
if(pValue->pType->isDummy())
{
pElemType = new ts::DummyType(line);
break;
}
const ts::Type* pValueType = pValue->pType;
if(pValueType->isA<ts::RangeType>())
pValueType = pValueType->as<ts::RangeType>()->baseType();
if(!pValueType->isCompatible(pElemType))
{
context()->error(line, "inconsistent set element types");
break;
}
}
}
pType = new ts::SetType(pElemType, nullptr, line);
}
///////////////////////////////////////////////////////////////////////////////
//
AssignStm::AssignStm(Expr* pLValue, Expr* pRValue, int line) :
Stm(line), pLValue(nullptr), pRValue(nullptr)
{
// try to compensate for auto-func-calls
//
auto pFuncCall = pLValue->as<FuncCall>();
if(nullptr != pFuncCall && pFuncCall->pArguments == nullptr)
{
pLValue = pFuncCall->pFunc;
}
// handle the assignments to the current funcition
//
if(pLValue->isA<FuncPtr>())
{
obj::Subroutine* pFunc = pLValue->as<FuncPtr>()->pFunc;
if(pFunc->pType->isFunction())
{
pLValue = lookupObject(new Identifier("_fnvalue", line), false, pFunc->pScope);
}
else
{
context()->error(line, "can't assign values to a procedure");
this->pLValue = pLValue;
return;
}
}
// generic lvalue semantic checks
//
if(!pLValue->isLValue())
{
context()->error(line, "assignment target must be a lvalue");
}
else if(!pLValue->pType->canBeAssigned(pRValue->pType))
{
context()->error(line, "value type incompatible with the assignment destination");
}
// do we need an implicit cast?
//
if(!pLValue->pType->isSameType(pRValue->pType))
{
pRValue = new TypeCast(pRValue, pLValue->pType, TypeCast::ctxAssignment, pRValue->line);
}
// finally set our pLValue and pRValue
//
this->pLValue = pLValue;
this->pRValue = pRValue;
}
///////////////////////////////////////////////////////////////////////////////
//
ForStm::ForStm(Identifier* pIndexId, Expr* pStartValue, Token* pDirection, Expr* pEndValue, Stm* pStm, int line) :
Stm(line), pIndex(nullptr), pStartValue(pStartValue),
pDirection(pDirection), pEndValue(pEndValue), pStm(pStm)
{
pIndex = lookupObject(pIndexId);
if(pIndex->pType->isDummy())
return;
if(!pIndex->isA<VarExpr>() ||
!pIndex->pType->canBeAssigned(pStartValue->pType))
{
context()->error(line, "for index must be a variable compatible with the start/end values");
return;
}
assert(pIndex->isLValue());
if(pIndex->as<VarExpr>()->pVariable->pScope->level !=
context()->symbolTable()->currentScope()->level)
{
context()->error(line, "for index must be a local variable");
return;
}
if(!pStartValue->pType->isOrdinal() ||
!pEndValue->pType->isCompatible(pStartValue->pType))
{
context()->error(line, "for end/start values must be ordinals");
return;
}
}
///////////////////////////////////////////////////////////////////////////////
//
// checks a list of actual arguments against a subroutine type
//
static
void checkArguments(Identifier* pId, const ts::SubroutineType* pType, ExprList* pArguments, int line)
{
auto paramList = pType->paramList();
if(pArguments == nullptr)
{
if(!paramList->empty())
{
context()->error(line,
"call to '%s' missing arguments",
pId->name.c_str());
}
return;
}
assert(!pArguments->empty());
auto paramIt = paramList->begin();
auto argIt = pArguments->begin();
for(;;)
{
bool endOfParams = (paramIt == paramList->end());
bool endOfArgs = (argIt == pArguments->end());
if(endOfParams != endOfArgs)
{
context()->error(line,
"incorrect number of arguments when calling '%s'",
pId->name.c_str());
return;
}
else if(endOfParams)
{
// done
//
return;
}
auto pArg = *argIt;
if(pArg->isA<WriteArgExpr>())
{
context()->error(line,
"format specifiers can only be used for write and writeln");
return;
}
if(paramIt->byRef)
{
// for "var" paramteters the actual argument type must match exactly
//
if(!paramIt->pType->isSameType(pArg->pType))
{
context()->error(line,
"invalid argument for var parameter '%s' when calling '%s' (types must match exactly)",
paramIt->pId->name.c_str(), pId->name.c_str());
return;
}
if(!pArg->isLValue())
{
context()->error(line,
"'var' argument '%s' must be a lvalue when calling '%s'",
paramIt->pId->name.c_str(), pId->name.c_str());
return;
}
auto pIndirection = pArg->as<ast::Indirection>();
if(pIndirection != nullptr && pIndirection->pObject->pType->isFile())
{
context()->error(line, "passing file variables as 'var' arguments is not supported");
return;
}
}
else
{
if(!paramIt->pType->canBeAssigned(pArg->pType))
{
context()->error(line,
"invalid argument value for '%s' when calling '%s'",
paramIt->pId->name.c_str(), pId->name.c_str());
return;
}
// do we need an implicit cast?
//
if(!paramIt->pType->isSameType(pArg->pType))
{
*argIt = new TypeCast(pArg, paramIt->pType, TypeCast::ctxArg, pArg->line);
}
}
++paramIt;
++argIt;
}
}
///////////////////////////////////////////////////////////////////////////////
//
// returns an expression that evaluates to the value of the 'input' or 'output'
// file variables
//
static
Expr* implicitFileArg(int idx, int line)
{
assert(idx >= 0 && idx < FIRST_ARG_FILE_IDX);
auto name = context()->symbolTable()->programArgs()[idx];
auto pId = new Identifier(name.c_str(), line);
auto pExpr = lookupObject(pId, false, context()->symbolTable()->programScope());
assert(pExpr->pType->isFile());
return pExpr;
}
///////////////////////////////////////////////////////////////////////////////
//
// inject implicit intrinsic arguments as needed
//
static
ExprList* addImplicitArguments(const Intrinsic* pIntrinsic, ExprList* pArguments, int line)
{
if(nullptr == pArguments)
pArguments = new ExprList();
switch(pIntrinsic->intrinsicId)
{
case obj::IN_EOF:
case obj::IN_EOLN:
if(pArguments->empty())
{
pArguments->push_front(implicitFileArg(INPUT_FILE_IDX, line));
}
break;
case obj::IN_PAGE:
if(pArguments->empty())
{
pArguments->push_front(implicitFileArg(OUTPUT_FILE_IDX, line));
}
break;
case obj::IN_READ:
case obj::IN_READLN:
if(pArguments->empty() || !pArguments->front()->pType->isFile())
{
pArguments->push_front(implicitFileArg(INPUT_FILE_IDX, line));
}
break;
case obj::IN_WRITE:
case obj::IN_WRITELN:
if(pArguments->empty() || !pArguments->front()->pType->isFile())
{
pArguments->push_front(implicitFileArg(OUTPUT_FILE_IDX, line));
}
break;
}
return pArguments;
}
///////////////////////////////////////////////////////////////////////////////
//
static
ts::Type* intrinsicReturnType(const Intrinsic* pIntrinsic,
const ExprList* pArguments, int line)
{
if(nullptr == pArguments || pArguments->size() != 1)
{
context()->error(line,
"'%s' requires exactly one argument",
obj::intrinsicName(pIntrinsic->intrinsicId));
return new ts::DummyType(line);
}
ts::Type* pReturnType = nullptr;
ts::Type* pArgType = pArguments->front()->pType;
assert(nullptr != pArgType);
switch(pIntrinsic->intrinsicId)
{
case obj::IN_ABS:
case obj::IN_SQR:
if(pArgType->isNumber())
{
if(pArgType->isReal())
pReturnType = ts::g_pRealType;
else
pReturnType = ts::g_pIntegerType;
}
break;
case obj::IN_SIN:
case obj::IN_COS:
case obj::IN_EXP:
case obj::IN_LN:
case obj::IN_SQRT:
case obj::IN_ARCTAN:
if(pArgType->isNumber())
pReturnType = ts::g_pRealType;
break;
case obj::IN_TRUNC:
case obj::IN_ROUND:
if(pArgType->isReal())
pReturnType = ts::g_pIntegerType;
break;
case obj::IN_ORD:
if(pArgType->isOrdinal())
pReturnType = ts::g_pIntegerType;
break;
case obj::IN_CHR:
if(pArgType->isInteger())
pReturnType = ts::g_pCharType;
break;
case obj::IN_SUCC:
case obj::IN_PRED:
if(pArgType->isOrdinal())
pReturnType = pArgType;
break;
case obj::IN_ODD:
if(pArgType->isInteger())
pReturnType = ts::g_pBoolType;
break;
case obj::IN_EOF:
if(pArgType->isFile())
pReturnType = ts::g_pBoolType;
break;
case obj::IN_EOLN:
{
auto pFileType = pArgType->as<ts::FileType>();
if(nullptr != pFileType && pFileType->isText())
pReturnType = ts::g_pBoolType;
}
break;
default:
context()->error(line,
"attempting to use intrinsic procedure '%s' as a function",
obj::intrinsicName(pIntrinsic->intrinsicId));
pReturnType = new ts::DummyType(line);
break;
}
if(nullptr == pReturnType)
{
context()->error(line,
"invalid arguments for '%s'",
obj::intrinsicName(pIntrinsic->intrinsicId));
pReturnType = new ts::DummyType(line);
}
return pReturnType;
}
///////////////////////////////////////////////////////////////////////////////
//
Expr* newFuncCall(Identifier* pId, ExprList* pArguments, int line)
{
ts::Type* pReturnType = nullptr;
Expr* pFunc = lookupObject(pId, false);
if(pFunc->pType->isDummy())
{
return new FuncCall(pFunc, pArguments, pFunc->pType, line);
}
const Intrinsic* pIntrinsic = pFunc->as<Intrinsic>();
if(nullptr != pIntrinsic)
{
pArguments = addImplicitArguments(pIntrinsic, pArguments, line);
pReturnType = intrinsicReturnType(pIntrinsic, pArguments, line);
}
else if(pFunc->pType->isSubroutine())
{
assert(pFunc->isA<FuncPtr>() || pFunc->isA<ParamExpr>());
const ts::SubroutineType* pSubroutineType = pFunc->pType->as<ts::SubroutineType>();
if(pSubroutineType->isFunction())
{
checkArguments(pId, pSubroutineType, pArguments, line);
pReturnType = pSubroutineType->returnType();
}
else
{
context()->error(pId->line,
"attempting to use procedure '%s' as a function",
pId->name.c_str());
}
}
else
{
context()->error(pId->line,
"'%s' is not a function",
pId->name.c_str());
}
if(nullptr == pReturnType)
pReturnType = new ts::DummyType(pId->line);
return new FuncCall(pFunc, pArguments, pReturnType, line);
}
///////////////////////////////////////////////////////////////////////////////
//
static
void checkReadArguments(bool readln, const ExprList* pArguments, int line)
{
const char* name = readln ? "readln" : "read";
auto it = pArguments->begin();
auto pFileType = (*it)->pType->as<ts::FileType>();
if(nullptr == pFileType)
{
context()->error(line, "missing file argument for '%s'", name);
return;
}
if(readln && !pFileType->isText())
{
context()->error(line, "readln() only works on text files");
return;
}
++it;
if(!readln && it == pArguments->end())
{
context()->error(line, "read() requires at least one value argument");
return;
}
while(it != pArguments->end())
{
auto pArgType = (*it)->pType;
if(!(*it)->isLValue())
{
context()->error(line, "%s requires lvalue arguments", name);
return;
}
if(pFileType->isText())
{
if(!pArgType->isNumber() &&
!pArgType->isString() &&
!pArgType->isChar())
{
context()->error(line, "invalid argument type for %s()", name);
return;
}
}
else
{
if(!pArgType->isSameType(pFileType->elemType()))
{
context()->error(line, "invalid argument type for %s()", name);
return;
}
}
if((*it)->isA<ast::WriteArgExpr>())
{
context()->error(line, "write format specifiers can't be used for %s()", name);
return;
}
++it;
}
}
///////////////////////////////////////////////////////////////////////////////
//
static
void checkWriteArguments(bool writeln, ExprList* pArguments, int line)
{
const char* name = writeln ? "writeln" : "write";
auto it = pArguments->begin();
auto pFileType = (*it)->pType->as<ts::FileType>();
if(nullptr == pFileType)
{
context()->error(line, "missing file argument for '%s'", name);
return;
}
if(writeln && !pFileType->isText())
{
context()->error(line, "writeln() only works on text files");
return;
}
++it;
if(!writeln && it == pArguments->end())
{
context()->error(line, "writeln() requires at least one value argument");
return;
}
while(it != pArguments->end())
{
auto pArg = *it;
auto pArgType = pArg->pType;
if(pFileType->isText())
{
if(!pArgType->isBool() &&
!pArgType->isNumber() &&
!pArgType->isString() &&
!pArgType->isChar())
{
context()->error(line, "invalid argument type for %s()", name);
return;
}
}
else
{
if(pArg->isA<ast::WriteArgExpr>())
{
context()->error(line, "write format specifiers only work on text files");
return;
}
if(!pFileType->elemType()->canBeAssigned(pArgType))
{
context()->error(line, "invalid argument type for %s()", name);
return;
}
// do we need an implicit cast?
//
if(!pFileType->elemType()->isSameType(pArgType))
{
*it = new TypeCast(pArg, pFileType->elemType(), TypeCast::ctxArg, pArg->line);
}
}
++it;
}
}
///////////////////////////////////////////////////////////////////////////////
//
static
void checkNewDisposeArguments(const ExprList* pArguments, const char* name, int line)
{
if(pArguments == nullptr || pArguments->empty())
{
context()->error(line, "missing arguments for %s()", name);
return;
}
// pointer
//
auto it = pArguments->begin();
if(!(*it)->pType->isPointer() || !(*it)->isLValue())
{
context()->error(line, "the first argument to %s() must be a pointer lvalue", name);
return;
}
// make sure it's really a ts::PointerType before casting
// (could be a fake, ex. ts::DummyType)
//
if(!(*it)->pType->isA<ts::PointerType>())
{
return;
}
// try to get the base type assuming it's a record type
//
auto pType = (*it)->pType->as<ts::PointerType>()->baseType()->as<ts::RecordType>();
if(nullptr == pType)
{
if(pArguments->size() != 1)
context()->error(line, "variant selectors can be specified only for record types");
return;
}
auto pFields = pType->fields();