void CParser::InitSymbolTable(CSymtab *s)
{
CTypeManager *tm = CTypeManager::Get();
// predefined functions:
// - DIM(a: ptr to array; dim: integer): integer
// - DOFS(a: ptr to array): integer
// - ReadInt(): integer
// - WriteInt(i:integer): void
// - WriteChar(c:char): void
// - WriteStr(str: char[]): void
// - WriteLn():void
// - DIM(a: ptr to array; dim: integer): integer
CSymProc *DIM = new CSymProc("DIM", tm->GetInt());
CSymParam *DIM_a = new CSymParam(0, "a", tm->GetPointer(tm->GetNull()));
CSymParam *DIM_dim = new CSymParam(1, "dim", tm->GetInt());
DIM->AddParam(DIM_a);
DIM->AddParam(DIM_dim);
s->AddSymbol(DIM);
// - DOFS(a: ptr to array): integer
CSymProc *DOFS = new CSymProc("DOFS", tm->GetInt());
CSymParam *DOFS_a = new CSymParam(0, "a", tm->GetPointer(tm->GetNull()));
DOFS->AddParam(DOFS_a);
s->AddSymbol(DOFS);
// - ReadInt(): integer
CSymProc *ReadInt = new CSymProc("ReadInt", tm->GetInt());
s->AddSymbol(ReadInt);
// - WriteInt(i:integer): void
CSymProc *WriteInt = new CSymProc("WriteInt", tm->GetNull());
CSymParam *WriteInt_i = new CSymParam(0, "i", tm->GetInt());
WriteInt->AddParam(WriteInt_i);
s->AddSymbol(WriteInt);
// - WriteChar(c:char): void
CSymProc *WriteChar = new CSymProc("WriteChar", tm->GetNull());
CSymParam *WriteChar_c = new CSymParam(0, "c", tm->GetChar());
WriteChar->AddParam(WriteChar_c);
s->AddSymbol(WriteChar);
// - WriteStr(str: char[]): void
CSymProc *WriteStr = new CSymProc("WriteStr", tm->GetNull());
CSymParam *WriteStr_str = new CSymParam(0, "str", tm->GetPointer(tm->GetArray(CArrayType::OPEN, tm->GetChar())));
WriteStr->AddParam(WriteStr_str);
s->AddSymbol(WriteStr);
// - WriteLn():void
CSymProc *WriteLn = new CSymProc("WriteLn", tm->GetNull());
s->AddSymbol(WriteLn);
}
void CParser::InitSymbolTable(CSymtab *s)
{
CTypeManager *tm = CTypeManager::Get();
CSymProc *fun;
// function DIM(array: pointer to array; dim: integer): integer
fun = new CSymProc("DIM", tm->GetInt());
fun->AddParam(new CSymParam(0, "arr", tm->GetPointer(tm->GetNull())));
fun->AddParam(new CSymParam(1, "dim", tm->GetInt()));
s->AddSymbol(fun);
// function DOFS(array: pointer to array): integer;
fun = new CSymProc("DOFS", tm->GetInt());
fun->AddParam(new CSymParam(0, "arr", tm->GetPointer(tm->GetNull())));
s->AddSymbol(fun);
// function ReadInt() : integer;
fun = new CSymProc("ReadInt", tm->GetInt());
s->AddSymbol(fun);
// procedure WriteInt(i: integer);
fun = new CSymProc("WriteInt", tm->GetNull());
fun->AddParam(new CSymParam(0, "i", tm->GetInt()));
s->AddSymbol(fun);
// procedure WriteChar(c: char);
fun = new CSymProc("WriteChar", tm->GetNull());
fun->AddParam(new CSymParam(0, "c", tm->GetChar()));
s->AddSymbol(fun);
// procedure WriteStr(string: char[]);
fun = new CSymProc("WriteStr", tm->GetNull());
fun->AddParam(new CSymParam(0, "str", tm->GetPointer(tm->GetArray(CArrayType::OPEN, tm->GetChar()))));
s->AddSymbol(fun);
// procedure WriteLn();
fun = new CSymProc("WriteLn", tm->GetNull());
s->AddSymbol(fun);
}
const CType* CAstSpecialOp::GetType(void) const
{
CTypeManager *tm = CTypeManager::Get();
EOperation oper = GetOperation();
if(GetOperand()->GetType() == NULL)
return NULL;
// case '&'
if(oper == opAddress) {
return tm->GetPointer(GetOperand()->GetType());
}
// we don't implement '*' , '(cast)'.
else if(oper == opDeref) {
return NULL;
}
else {
return NULL;
}
}
const CType* CParser::type(bool isParam, bool isFunction) {
//
// type ::= basetype | type "[" [ number ] "]".
// basetype ::= "boolean" | "char" | "integer".
//
CToken t;
CToken tk;
EToken tt = _scanner->Peek().GetType();
CTypeManager *tm = CTypeManager::Get();
const CType *type;
vector<int> nelems;
// basetype cases.
switch(tt) {
case tBoolean:
Consume(tBoolean, &t);
tk = t;
type = dynamic_cast<const CType *>(tm->GetBool());
break;
case tChar:
Consume(tChar, &t);
tk = t;
type = dynamic_cast<const CType *>(tm->GetChar());
break;
case tInteger:
Consume(tInteger, &t);
tk = t;
type = dynamic_cast<const CType *>(tm->GetInt());
break;
default:
SetError(_scanner->Peek(), "basetype expected.");
break;
}
assert(type != NULL);
// array case.
while(_scanner->Peek().GetType() == tLSBrak) {
Consume(tLSBrak);
CToken nelem;
if(_scanner->Peek().GetType() == tNumber) {
Consume(tNumber, &nelem);
nelems.push_back(atoi(nelem.GetValue().c_str()));
}
else {
// open arrays are allowed only in parameter.
if(isParam)
nelems.push_back(-1);
else
SetError(_scanner->Peek(), "expected 'tNumber', got '" + _scanner->Peek().GetName() + "'");
}
Consume(tRSBrak);
}
for(int i = nelems.size()-1; i >= 0; i--) {
type = dynamic_cast<const CType *>(tm->GetArray(nelems[i], type));
assert(type != NULL);
nelems.pop_back();
// Arrays are addressed in parameter.
if(i == 0 && isParam)
type = dynamic_cast<const CType *>(tm->GetPointer(type));
}
if(isFunction && !type->IsScalar()) {
SetError(tk, "invalid composite type for function.");
}
return type;
}