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|
/*****
* dec.cc
* Andy Hammerlindl 2002/8/29
*
* Represents the abstract syntax tree for declarations in the language.
* Also included is an abstract syntax for types as they are most often
* used with declarations.
*****/
#include "errormsg.h"
#include "coenv.h"
#include "dec.h"
#include "fundec.h"
#include "newexp.h"
#include "stm.h"
#include "exp.h"
#include "modifier.h"
#include "runtime.h"
#include "parser.h"
namespace absyntax {
using namespace trans;
using namespace types;
using mem::list;
trans::tyEntry *ty::transAsTyEntry(coenv &e, record *where)
{
return new trans::tyEntry(trans(e, false), 0, where, getPos());
}
void nameTy::prettyprint(ostream &out, Int indent)
{
prettyname(out, "nameTy",indent);
id->prettyprint(out, indent+1);
}
types::ty *nameTy::trans(coenv &e, bool tacit)
{
return id->typeTrans(e, tacit);
}
trans::tyEntry *nameTy::transAsTyEntry(coenv &e, record *)
{
return id->tyEntryTrans(e);
}
void dimensions::prettyprint(ostream &out, Int indent)
{
prettyindent(out, indent);
out << "dimensions (" << depth << ")\n";
}
types::array *dimensions::truetype(types::ty *base)
{
if (base->kind == ty_void) {
em.error(getPos());
em << "cannot declare array of type void";
}
assert(depth >= 1);
size_t d=depth;
types::array *a=new types::array(base); d--;
for (; d > 0; d--) {
a = new types::array(a);
}
return a;
}
void arrayTy::prettyprint(ostream &out, Int indent)
{
prettyname(out, "arrayTy",indent);
cell->prettyprint(out, indent+1);
dims->prettyprint(out, indent+1);
}
// NOTE: Can this be merged with trans somehow?
void arrayTy::addOps(coenv &e, record *r)
{
types::ty *t=trans(e, true);
// Only add ops if it is an array (and not, say, an error)
if (t->kind == types::ty_array) {
types::array *at=dynamic_cast<types::array *>(t);
assert(at);
e.e.addArrayOps(at);
if (r)
r->e.addArrayOps(at);
}
}
types::ty *arrayTy::trans(coenv &e, bool tacit)
{
types::ty *ct = cell->trans(e, tacit);
assert(ct);
// Don't make an array of errors.
if (ct->kind == types::ty_error)
return ct;
types::array *t = dims->truetype(ct);
assert(t);
return t;
}
tyEntryTy::tyEntryTy(position pos, types::ty *t)
: ty(pos), ent(new trans::tyEntry(t, 0, 0, position()))
{
}
void tyEntryTy::prettyprint(ostream &out, Int indent)
{
prettyindent(out,indent);
out << "tyEntryTy: " << *(ent->t) << "\n";
}
types::ty *tyEntryTy::trans(coenv &, bool) {
return ent->t;
}
vm::lambda *runnable::transAsCodelet(coenv &e)
{
coder c=e.c.newCodelet(getPos());
coenv ce(c, e.e);
markTrans(ce);
return c.close();
}
void block::prettystms(ostream &out, Int indent)
{
for (list<runnable *>::iterator p = stms.begin(); p != stms.end(); ++p)
(*p)->prettyprint(out, indent);
}
void block::prettyprint(ostream &out, Int indent)
{
prettyname(out,"block",indent);
prettystms(out, indent+1);
}
void block::trans(coenv &e)
{
if (scope) e.e.beginScope();
for (list<runnable *>::iterator p = stms.begin(); p != stms.end(); ++p) {
(*p)->markTrans(e);
}
if (scope) e.e.endScope();
}
void block::transAsField(coenv &e, record *r)
{
if (scope) e.e.beginScope();
for (list<runnable *>::iterator p = stms.begin(); p != stms.end(); ++p) {
(*p)->markTransAsField(e, r);
}
if (scope) e.e.endScope();
}
void block::transAsRecordBody(coenv &e, record *r)
{
transAsField(e, r);
e.c.closeRecord();
}
record *block::transAsFile(genv& ge, symbol id)
{
// Create the new module.
record *r = new record(id, new frame(id,0,0));
// Create coder and environment to translate the module.
// File-level modules have dynamic fields by default.
coder c(getPos(), r, 0);
env e(ge);
coenv ce(c, e);
// Translate the abstract syntax.
if (settings::getSetting<bool>("autoplain")) {
autoplainRunnable()->transAsField(ce, r);
}
transAsRecordBody(ce, r);
em.sync();
return r;
}
bool block::returns() {
// Search for a returning runnable, starting at the end for efficiency.
for (list<runnable *>::reverse_iterator p=stms.rbegin();
p != stms.rend();
++p)
if ((*p)->returns())
return true;
return false;
}
vardec *block::asVardec()
{
vardec *var = 0;
for (list<runnable *>::iterator p=stms.begin();
p != stms.end();
++p)
{
vardec *v = dynamic_cast<vardec *>(*p);
if (v) {
if (var)
// Multiple vardecs.
return 0;
var = v;
}
else if (!dynamic_cast<emptyStm *>(*p))
// Failure due to another runnable in the block.
return 0;
}
return var;
}
void dec::prettyprint(ostream &out, Int indent)
{
prettyname(out, "dec", indent);
}
void modifierList::prettyprint(ostream &out, Int indent)
{
prettyindent(out,indent);
out << "modifierList (";
for (list<modifier>::iterator p = mods.begin(); p != mods.end(); ++p) {
if (p != mods.begin())
out << ", ";
switch (*p) {
case EXPLICIT_STATIC:
out << "static";
break;
#if 0
case EXPLICIT_DYNAMIC:
out << "dynamic";
break;
#endif
default:
out << "invalid code";
}
}
for (list<permission>::iterator p = perms.begin(); p != perms.end(); ++p) {
if (p != perms.begin() || !mods.empty())
out << ", ";
switch (*p) {
case PUBLIC:
out << "public";
break;
case PRIVATE:
out << "private";
break;
default:
out << "invalid code";
}
}
out << ")\n";
}
bool modifierList::staticSet()
{
return !mods.empty();
}
modifier modifierList::getModifier()
{
if (mods.size() > 1) {
em.error(getPos());
em << "too many modifiers";
}
assert(staticSet());
return mods.front();
}
permission modifierList::getPermission()
{
if (perms.size() > 1) {
em.error(getPos());
em << "too many modifiers";
}
return perms.empty() ? DEFAULT_PERM : perms.front();
}
void modifiedRunnable::prettyprint(ostream &out, Int indent)
{
prettyname(out, "modifierRunnable",indent);
mods->prettyprint(out, indent+1);
body->prettyprint(out, indent+1);
}
void modifiedRunnable::transAsField(coenv &e, record *r)
{
if (mods->staticSet()) {
if (e.c.isTopLevel()) {
em.warning(getPos());
em << "static modifier is meaningless at top level";
}
e.c.pushModifier(mods->getModifier());
}
permission p = mods->getPermission();
#if 0 // This is innocuous
if (p != DEFAULT_PERM && (!r || !body->allowPermissions())) {
em.warning(pos);
em << "permission modifier is meaningless";
}
#endif
e.c.setPermission(p);
body->transAsField(e,r);
e.c.clearPermission();
if (mods->staticSet())
e.c.popModifier();
}
void decidstart::prettyprint(ostream &out, Int indent)
{
prettyindent(out, indent);
out << "decidstart '" << id << "'\n";
if (dims)
dims->prettyprint(out, indent+1);
}
types::ty *decidstart::getType(types::ty *base, coenv &, bool)
{
return dims ? dims->truetype(base) : base;
}
trans::tyEntry *decidstart::getTyEntry(trans::tyEntry *base, coenv &e,
record *where)
{
return dims ? new trans::tyEntry(getType(base->t,e,false), 0,
where, getPos()) :
base;
}
void decidstart::addOps(types::ty *base, coenv &e, record *r)
{
if (dims) {
e.e.addArrayOps(dims->truetype(base));
if (r)
r->e.addArrayOps(dims->truetype(base));
}
}
void fundecidstart::prettyprint(ostream &out, Int indent)
{
prettyindent(out, indent);
out << "fundecidstart '" << id << "'\n";
if (dims)
dims->prettyprint(out, indent+1);
if (params)
params->prettyprint(out, indent+1);
}
types::ty *fundecidstart::getType(types::ty *base, coenv &e, bool tacit)
{
types::ty *result = decidstart::getType(base, e, tacit);
if (params) {
return params->getType(result, e, true, tacit);
}
else {
types::ty *t = new function(base);
return t;
}
}
trans::tyEntry *fundecidstart::getTyEntry(trans::tyEntry *base, coenv &e,
record *where)
{
return new trans::tyEntry(getType(base->t,e,false), 0, where, getPos());
}
void fundecidstart::addOps(types::ty *base, coenv &e, record *r)
{
decidstart::addOps(base, e, r);
params->addOps(e, r);
types::function *ft=dynamic_cast<types::function *>(getType(base, e, true));
assert(ft);
e.e.addFunctionOps(ft);
if (r)
r->e.addFunctionOps(ft);
}
void decid::prettyprint(ostream &out, Int indent)
{
prettyname(out, "decid",indent);
start->prettyprint(out, indent+1);
if (init)
init->prettyprint(out, indent+1);
}
varEntry *makeVarEntryWhere(coenv &e, record *r, types::ty *t,
record *where, position pos)
{
access *a = r ? r->allocField(e.c.isStatic()) :
e.c.allocLocal();
return r ? new varEntry(t, a, e.c.getPermission(), r, where, pos) :
new varEntry(t, a, where, pos);
}
varEntry *makeVarEntry(position pos, coenv &e, record *r, types::ty *t) {
return makeVarEntryWhere(e, r, t, r, pos);
}
// Defined in constructor.cc.
bool definesImplicitConstructor(coenv &e, record *r, varEntry *v, symbol id);
void addConstructorFromInitializer(position pos, coenv &e, record *r,
varEntry *init);
void addVar(coenv &e, record *r, varEntry *v, symbol id)
{
// Test for 'operator init' definitions that implicitly define constructors:
if (definesImplicitConstructor(e, r, v, id))
addConstructorFromInitializer(position(), e, r, v);
// Add to the record so it can be accessed when qualified; add to the
// environment so it can be accessed unqualified in the scope of the
// record definition.
if (r)
r->e.addVar(id, v);
e.e.addVar(id, v);
}
void initializeVar(position pos, coenv &e, varEntry *v, varinit *init)
{
types::ty *t=v->getType();
if (init)
init->transToType(e, t);
else {
definit d(pos);
d.transToType(e, t);
}
v->getLocation()->encode(WRITE, pos, e.c);
e.c.encodePop();
}
types::ty *inferType(position pos, coenv &e, varinit *init)
{
if (!init) {
em.error(pos);
em << "inferred variable declaration without initializer";
return primError();
}
exp *base = dynamic_cast<exp *>(init);
if (base) {
types::ty *t = base->cgetType(e);
if (t->kind != ty_overloaded)
return t;
}
em.error(pos);
em << "could not infer type of initializer";
return primError();
}
void createVar(position pos, coenv &e, record *r,
symbol id, types::ty *t, varinit *init)
{
// I'm not sure how to handle inferred types in these cases.
assert(t->kind != types::ty_inferred);
varEntry *v=makeVarEntry(pos, e, r, t);
addVar(e, r, v, id);
initializeVar(pos, e, v, init);
}
void createVarOutOfOrder(position pos, coenv &e, record *r,
symbol id, types::ty *t, varinit *init)
{
/* For declarations such as "var x = 5;", infer the type from the
* initializer.
*/
if (t->kind == types::ty_inferred)
t = inferType(pos, e, init);
varEntry *v=makeVarEntry(pos, e, r, t);
initializeVar(pos, e, v, init);
addVar(e, r, v, id);
}
void addTypeWithPermission(coenv &e, record *r, tyEntry *base, symbol id)
{
// Only bother encoding permissions for private types.
tyEntry *ent = (r && e.c.getPermission()==PRIVATE) ?
new trans::tyEntry(base, PRIVATE, r) :
base;
if (r)
r->e.addType(id, ent);
e.e.addType(id, ent);
}
void decid::transAsField(coenv &e, record *r, types::ty *base)
{
types::ty *t = start->getType(base, e);
assert(t);
if (t->kind == ty_void) {
em.error(getPos());
em << "cannot declare variable of type void";
}
start->addOps(base, e, r);
createVarOutOfOrder(getPos(), e, r, start->getName(), t, init);
}
void decid::transAsTypedefField(coenv &e, trans::tyEntry *base, record *r)
{
trans::tyEntry *ent = start->getTyEntry(base, e, r);
assert(ent && ent->t);
if (init) {
em.error(getPos());
em << "type definition cannot have initializer";
}
start->addOps(base->t, e, r);
addTypeWithPermission(e, r, ent, start->getName());
}
void decidlist::prettyprint(ostream &out, Int indent)
{
prettyname(out, "decidlist",indent);
for (list<decid *>::iterator p = decs.begin(); p != decs.end(); ++p)
(*p)->prettyprint(out, indent+1);
}
void decidlist::transAsField(coenv &e, record *r, types::ty *base)
{
for (list<decid *>::iterator p = decs.begin(); p != decs.end(); ++p)
(*p)->transAsField(e, r, base);
}
void decidlist::transAsTypedefField(coenv &e, trans::tyEntry *base, record *r)
{
for (list<decid *>::iterator p = decs.begin(); p != decs.end(); ++p)
(*p)->transAsTypedefField(e, base, r);
}
void vardec::prettyprint(ostream &out, Int indent)
{
prettyname(out, "vardec",indent);
base->prettyprint(out, indent+1);
decs->prettyprint(out, indent+1);
}
void vardec::transAsTypedefField(coenv &e, record *r)
{
base->addOps(e, r);
decs->transAsTypedefField(e, base->transAsTyEntry(e, r), r);
}
symbol vardec::singleName()
{
decid *did = decs->singleEntry();
if (!did)
return symbol::nullsym;
return did->getStart()->getName();
}
types::ty *vardec::singleGetType(coenv &e)
{
decid *did = decs->singleEntry();
if (!did)
return 0;
return did->getStart()->getType(base->trans(e), e);
}
// Helper class for imports. This essentially evaluates to the run::loadModule
// function. However, that function returns different types of records
// depending on the filename given to it, so we cannot add it to the
// environment. Instead, we explicitly tell it what types::record it is
// returning for each use.
class loadModuleExp : public exp {
function *ft;
public:
loadModuleExp(position pos, record *imp)
: exp(pos) {ft=new function(imp,primString());}
void prettyprint(ostream &out, Int indent) {
prettyname(out, "loadModuleExp", indent);
}
types::ty *trans(coenv &) {
em.compiler(getPos());
em << "trans called for loadModuleExp";
return primError();
}
void transCall(coenv &e, types::ty *t) {
assert(equivalent(t, ft));
e.c.encode(inst::builtin, run::loadModule);
}
types::ty *getType(coenv &) {
return ft;
}
exp *evaluate(coenv &, types::ty *) {
// Don't alias.
return this;
}
};
// Creates a local variable to hold the import and translate the accessing of
// the import, but doesn't add the import to the environment.
varEntry *accessModule(position pos, coenv &e, record *r, symbol id)
{
record *imp=e.e.getModule(id, (string)id);
if (!imp) {
em.error(pos);
em << "could not load module '" << id << "'";
em.sync();
return 0;
}
else {
// Create a varinit that evaluates to the module.
// This is effectively the expression "loadModule(filename)".
callExp init(pos, new loadModuleExp(pos, imp),
new stringExp(pos, (string)id));
// The varEntry should have whereDefined()==0 as it is not defined inside
// the record r.
varEntry *v=makeVarEntryWhere(e, r, imp, 0, pos);
initializeVar(pos, e, v, &init);
return v;
}
}
void idpair::prettyprint(ostream &out, Int indent)
{
prettyindent(out, indent);
out << "idpair (" << "'" << src << "' as " << dest << ")\n";
}
void idpair::transAsAccess(coenv &e, record *r)
{
checkValidity();
varEntry *v=accessModule(getPos(), e, r, src);
if (v)
addVar(e, r, v, dest);
}
void idpair::transAsUnravel(coenv &e, record *r,
protoenv &source, varEntry *qualifier)
{
checkValidity();
if (r)
r->e.add(src, dest, source, qualifier, e.c);
if (!e.e.add(src, dest, source, qualifier, e.c)) {
em.error(getPos());
em << "no matching types or fields of name '" << src << "'";
}
}
void idpairlist::prettyprint(ostream &out, Int indent)
{
for (list<idpair *>::iterator p=base.begin();
p != base.end();
++p)
(*p)->prettyprint(out, indent);
}
void idpairlist::transAsAccess(coenv &e, record *r)
{
for (list<idpair *>::iterator p=base.begin();
p != base.end();
++p)
(*p)->transAsAccess(e,r);
}
void idpairlist::transAsUnravel(coenv &e, record *r,
protoenv &source, varEntry *qualifier)
{
for (list<idpair *>::iterator p=base.begin();
p != base.end();
++p)
(*p)->transAsUnravel(e,r,source,qualifier);
}
idpairlist * const WILDCARD = 0;
void accessdec::prettyprint(ostream &out, Int indent)
{
prettyname(out, "accessdec", indent);
base->prettyprint(out, indent+1);
}
void fromdec::prettyprint(ostream &out, Int indent)
{
prettyname(out, "fromdec", indent);
fields->prettyprint(out, indent+1);
}
void fromdec::transAsField(coenv &e, record *r)
{
qualifier q=getQualifier(e,r);
if (q.t) {
if (fields==WILDCARD) {
if (r)
r->e.add(q.t->e, q.v, e.c);
e.e.add(q.t->e, q.v, e.c);
}
else
fields->transAsUnravel(e, r, q.t->e, q.v);
}
}
void unraveldec::prettyprint(ostream &out, Int indent)
{
prettyname(out, "unraveldec", indent);
id->prettyprint(out, indent+1);
idpairlist *f=this->fields;
if(f) f->prettyprint(out, indent+1);
}
fromdec::qualifier unraveldec::getQualifier(coenv &e, record *)
{
// getType is where errors in the qualifier are reported.
record *qt=dynamic_cast<record *>(id->getType(e, false));
if (!qt) {
em.error(getPos());
em << "qualifier is not a record";
}
return qualifier(qt,id->getVarEntry(e));
}
void fromaccessdec::prettyprint(ostream &out, Int indent)
{
prettyindent(out, indent);
out << "fromaccessdec '" << id << "'\n";
idpairlist *f=this->fields;
if(f) f->prettyprint(out, indent+1);
}
fromdec::qualifier fromaccessdec::getQualifier(coenv &e, record *r)
{
varEntry *v=accessModule(getPos(), e, r, id);
if (v) {
record *qt=dynamic_cast<record *>(v->getType());
if (!qt) {
em.compiler(getPos());
em << "qualifier is not a record";
}
return qualifier(qt, v);
}
else
return qualifier(0,0);
}
void importdec::prettyprint(ostream &out, Int indent)
{
prettyname(out, "importdec", indent);
base.prettyprint(out, indent+1);
}
void includedec::prettyprint(ostream &out, Int indent)
{
prettyindent(out, indent);
out << "includedec ('" << filename << "')\n";
}
void includedec::loadFailed(coenv &)
{
em.warning(getPos());
em << "could not parse file of name '" << filename << "'";
em.sync();
}
void includedec::transAsField(coenv &e, record *r)
{
file *ast = parser::parseFile(filename,"Including");
em.sync();
// The runnables will be translated, one at a time, without any additional
// scoping.
ast->transAsField(e, r);
}
void typedec::prettyprint(ostream &out, Int indent)
{
prettyname(out, "typedec",indent);
body->prettyprint(out, indent+1);
}
void recorddec::prettyprint(ostream &out, Int indent)
{
prettyindent(out, indent);
out << "structdec '" << id << "'\n";
body->prettyprint(out, indent+1);
}
void recorddec::transRecordInitializer(coenv &e, record *parent)
{
position here=getPos();
// This is equivalent to the code
// A operator init() { return new A; }
// where A is the name of the record.
formals formals(here);
simpleName recordName(here, id);
nameTy result(here, &recordName);
newRecordExp exp(here, &result);
returnStm stm(here, &exp);
fundec init(here, &result, symbol::opTrans("init"), &formals, &stm);
init.transAsField(e, parent);
}
void recorddec::addPostRecordEnvironment(coenv &e, record *r, record *parent) {
if (parent)
parent->e.add(r->postdefenv, 0, e.c);
e.e.add(r->postdefenv, 0, e.c);
}
void recorddec::transAsField(coenv &e, record *parent)
{
record *r = parent ? parent->newRecord(id, e.c.isStatic()) :
e.c.newRecord(id);
addTypeWithPermission(e, parent, new trans::tyEntry(r,0,parent,getPos()), id);
e.e.addRecordOps(r);
if (parent)
parent->e.addRecordOps(r);
// Start translating the initializer.
coder c=e.c.newRecordInit(getPos(), r);
coenv re(c,e.e);
body->transAsRecordBody(re, r);
// After the record is translated, add a default initializer so that a
// variable of the type of the record is initialized to a new instance by
// default.
transRecordInitializer(e, parent);
// Add types and variables defined during the record that should be added to
// the enclosing environment. These are the implicit constructors defined by
// "operator init".
addPostRecordEnvironment(e, r, parent);
}
runnable *autoplainRunnable() {
// Abstract syntax for the code:
// private import plain;
position pos=position();
static importdec ap(pos, new idpair(pos, symbol::trans("plain")));
static modifiedRunnable mr(pos, trans::PRIVATE, &ap);
return &mr;
}
} // namespace absyntax
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