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/*****
* fundec.h
* Andy Hammerlindl 2002/8/29
*
* Defines the semantics for defining functions. Both the newexp syntax, and
* the abbreviated C-style function definition.
*****/
#ifndef FUNDEC_H
#define FUNDEC_H
#include "dec.h"
#include "exp.h"
namespace absyntax {
class formal : public absyn {
ty *base;
decidstart *start;
bool Explicit;
varinit *defval;
public:
formal(position pos, ty *base, decidstart *start=0, varinit *defval=0,
bool Explicit= false)
: absyn(pos), base(base), start(start), Explicit(Explicit),
defval(defval) {}
virtual void prettyprint(ostream &out, Int indent);
// Build the corresponding types::formal to put into a signature.
types::formal trans(coenv &e, bool encodeDefVal, bool tacit=false);
// Add the formal parameter to the environment to prepare for the
// function body's translation.
virtual void transAsVar(coenv &e, Int index);
types::ty *getType(coenv &e, bool tacit=false);
virtual void addOps(coenv &e, record *r);
varinit *getDefaultValue() {
return defval;
}
symbol *getName() {
return start ? start->getName() : 0;
}
bool getExplicit() {
return Explicit;
}
};
class formals : public absyn {
//friend class funheader;
mem::list<formal *> fields;
formal *rest;
void addToSignature(types::signature& sig,
coenv &e, bool encodeDefVal, bool tacit);
public:
formals(position pos)
: absyn(pos), rest(0) {}
virtual ~formals() {}
virtual void prettyprint(ostream &out, Int indent);
virtual void add(formal *f) {
fields.push_back(f);
}
virtual void addRest(formal *f) {
rest = f;
}
// Returns the types of each parameter as a signature.
// encodeDefVal means that it will also encode information regarding
// the default values into the signature
types::signature *getSignature(coenv &e,
bool encodeDefVal = false,
bool tacit = false);
// Returns the corresponding function type, assuming it has a return
// value of "result."
types::function *getType(types::ty *result, coenv &e,
bool encodeDefVal = false,
bool tacit = false);
virtual void addOps(coenv &e, record *r);
// Add the formal parameters to the environment to prepare for the
// function body's translation.
virtual void trans(coenv &e);
};
class fundef : public exp {
ty *result;
formals *params;
stm *body;
// If the fundef is part of a fundec, the name of the function is stored
// here for debugging purposes.
symbol *id;
friend class fundec;
public:
fundef(position pos, ty *result, formals *params, stm *body)
: exp(pos), result(result), params(params), body(body), id(0) {}
virtual void prettyprint(ostream &out, Int indent);
varinit *makeVarInit(types::function *ft);
virtual void baseTrans(coenv &e, types::function *ft);
virtual types::ty *trans(coenv &e);
virtual types::function *transType(coenv &e, bool tacit);
virtual types::function *transTypeAndAddOps(coenv &e, record *r, bool tacit);
virtual types::ty *getType(coenv &e) {
return transType(e, true);
}
};
class fundec : public dec {
symbol *id;
fundef fun;
public:
fundec(position pos, ty *result, symbol *id, formals *params, stm *body)
: dec(pos), id(id), fun(pos, result, params, body)
{ fun.id = id; }
void prettyprint(ostream &out, Int indent);
void trans(coenv &e);
void transAsField(coenv &e, record *r);
};
} // namespace absyntax
#endif
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