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/*****
* env.h
* Andy Hammerlindl 2002/6/20
*
* Keeps track of the namespaces of variables and types when traversing
* the abstract syntax.
*****/
#include "env.h"
#include "record.h"
#include "genv.h"
#include "builtin.h"
using namespace types;
namespace absyntax {
void clearCachedCalls();
}
namespace trans {
// Instances of this class are passed to types::ty objects so that they can call
// back to env when checking casting of subtypes.
class envCaster : public caster {
protoenv &e;
symbol *name;
public:
envCaster(protoenv &e, symbol *name)
: e(e), name(name) {}
access *operator() (ty *target, ty *source) {
return e.lookupCast(target, source, name);
}
bool castable(ty *target, ty *source) {
return e.castable(target, source, name);
}
};
access *protoenv::baseLookupCast(ty *target, ty *source, symbol *name) {
static identAccess id;
assert(target->kind != ty_overloaded &&
source->kind != ty_overloaded);
// If errors already exist, don't report more. This may, however, cause
// problems with resoving the signature of an overloaded function. The
// abstract syntax should check if any of the parameters had an error before
// finding the signature.
if (target->kind == ty_error || source->kind == ty_error)
return &id;
else if (equivalent(target,source))
return &id;
else {
varEntry *v=lookupVarByType(name,new function(target,source));
return v ? v->getLocation() : 0;
}
}
access *protoenv::lookupCast(ty *target, ty *source, symbol *name) {
access *a=baseLookupCast(target, source, name);
if (a)
return a;
envCaster ec(*this, name);
return source->castTo(target, ec);
}
bool protoenv::castable(ty *target, ty *source, symbol *name) {
struct castTester : public tester {
protoenv &e;
symbol *name;
castTester(protoenv &e, symbol *name)
: e(e), name(name) {}
bool base(ty *t, ty *s) {
access *a=e.baseLookupCast(t, s, name);
if (a)
return true;
envCaster ec(e, name);
return s->castable(t, ec);
}
};
castTester ct(*this, name);
return ct.test(target,source);
}
ty *protoenv::castTarget(ty *target, ty *source, symbol *name) {
struct resolver : public collector {
protoenv &e;
symbol *name;
resolver(protoenv &e, symbol *name)
: e(e), name(name) {}
types::ty *base(types::ty *target, types::ty *source) {
return e.castable(target, source, name) ? target : 0;
}
};
resolver r(*this, name);
return r.collect(target, source);
}
ty *protoenv::castSource(ty *target, ty *source, symbol *name) {
struct resolver : public collector {
protoenv &e;
symbol *name;
resolver(protoenv &e, symbol *name)
: e(e), name(name) {}
types::ty *base(types::ty *target, types::ty *source) {
return e.castable(target, source, name) ? source : 0;
}
};
resolver r(*this, name);
return r.collect(target, source);
}
void protoenv::addArrayOps(array *a)
{
trans::addArrayOps(ve, a);
}
void protoenv::addRecordOps(record *r)
{
trans::addRecordOps(ve, r);
}
void protoenv::addFunctionOps(function *f)
{
trans::addFunctionOps(ve, f);
}
env::env(genv &ge)
: protoenv(venv::file_env_tag()), ge(ge)
{
// NOTE: May want to make this initial environment into a "builtin" module,
// and then import the builtin module.
base_tenv(te);
base_venv(ve);
}
env::~env()
{
}
record *env::getModule(symbol *id, string filename)
{
return ge.getModule(id, filename);
}
}
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