void EnumDeclaration::semantic(Scope *sc)
{
//printf("EnumDeclaration::semantic(sd = %p, '%s') %s\n", sc->scopesym, sc->scopesym->toChars(), toChars());
//printf("EnumDeclaration::semantic() %p %s\n", this, toChars());
if (semanticRun >= PASSsemanticdone)
return; // semantic() already completed
if (semanticRun == PASSsemantic)
{
assert(memtype);
::error(loc, "circular reference to enum base type %s", memtype->toChars());
errors = true;
semanticRun = PASSsemanticdone;
return;
}
unsigned dprogress_save = Module::dprogress;
Scope *scx = NULL;
if (scope)
{
sc = scope;
scx = scope; // save so we don't make redundant copies
scope = NULL;
}
parent = sc->parent;
type = type->semantic(loc, sc);
protection = sc->protection;
if (sc->stc & STCdeprecated)
isdeprecated = true;
userAttribDecl = sc->userAttribDecl;
semanticRun = PASSsemantic;
if (!members && !memtype) // enum ident;
{
semanticRun = PASSsemanticdone;
return;
}
if (!symtab)
symtab = new DsymbolTable();
/* The separate, and distinct, cases are:
* 1. enum { ... }
* 2. enum : memtype { ... }
* 3. enum ident { ... }
* 4. enum ident : memtype { ... }
* 5. enum ident : memtype;
* 6. enum ident;
*/
if (memtype)
{
memtype = memtype->semantic(loc, sc);
/* Check to see if memtype is forward referenced
*/
if (memtype->ty == Tenum)
{
EnumDeclaration *sym = (EnumDeclaration *)memtype->toDsymbol(sc);
if (!sym->memtype || !sym->members || !sym->symtab || sym->scope)
{
// memtype is forward referenced, so try again later
scope = scx ? scx : sc->copy();
scope->setNoFree();
scope->module->addDeferredSemantic(this);
Module::dprogress = dprogress_save;
//printf("\tdeferring %s\n", toChars());
semanticRun = PASSinit;
return;
}
}
if (memtype->ty == Tvoid)
{
error("base type must not be void");
memtype = Type::terror;
}
if (memtype->ty == Terror)
{
errors = true;
if (members)
{
for (size_t i = 0; i < members->dim; i++)
{
Dsymbol *s = (*members)[i];
s->errors = true; // poison all the members
}
}
semanticRun = PASSsemanticdone;
return;
}
}
semanticRun = PASSsemanticdone;
if (!members) // enum ident : memtype;
return;
if (members->dim == 0)
{
error("enum %s must have at least one member", toChars());
errors = true;
return;
}
Module::dprogress++;
Scope *sce;
if (isAnonymous())
sce = sc;
else
{
sce = sc->push(this);
sce->parent = this;
}
sce = sce->startCTFE();
sce->setNoFree(); // needed for getMaxMinValue()
/* Each enum member gets the sce scope
*/
for (size_t i = 0; i < members->dim; i++)
{
EnumMember *em = (*members)[i]->isEnumMember();
if (em)
em->scope = sce;
}
if (!added)
{
/* addMember() is not called when the EnumDeclaration appears as a function statement,
* so we have to do what addMember() does and install the enum members in the right symbol
* table
*/
ScopeDsymbol *scopesym = NULL;
if (isAnonymous())
{
/* Anonymous enum members get added to enclosing scope.
*/
for (Scope *sct = sce; 1; sct = sct->enclosing)
{
assert(sct);
if (sct->scopesym)
{
scopesym = sct->scopesym;
if (!sct->scopesym->symtab)
sct->scopesym->symtab = new DsymbolTable();
break;
}
}
}
else
{
// Otherwise enum members are in the EnumDeclaration's symbol table
scopesym = this;
}
for (size_t i = 0; i < members->dim; i++)
{
EnumMember *em = (*members)[i]->isEnumMember();
if (em)
{
em->ed = this;
em->addMember(sc, scopesym, 1);
}
}
}
for (size_t i = 0; i < members->dim; i++)
{
EnumMember *em = (*members)[i]->isEnumMember();
if (em)
em->semantic(em->scope);
}
//printf("defaultval = %lld\n", defaultval);
//if (defaultval) printf("defaultval: %s %s\n", defaultval->toChars(), defaultval->type->toChars());
//printf("members = %s\n", members->toChars());
}
void EnumMember::semantic(Scope *sc)
{
//printf("EnumMember::semantic() %s\n", toChars());
if (errors || semanticRun >= PASSsemanticdone)
return;
if (semanticRun == PASSsemantic)
{
error("circular reference to enum member");
Lerrors:
errors = true;
semanticRun = PASSsemanticdone;
return;
}
assert(ed);
ed->semantic(sc);
if (ed->errors)
goto Lerrors;
if (errors || semanticRun >= PASSsemanticdone)
return;
semanticRun = PASSsemantic;
if (scope)
sc = scope;
// The first enum member is special
bool first = (this == (*ed->members)[0]);
if (type)
{
type = type->semantic(loc, sc);
assert(value); // "type id;" is not a valid enum member declaration
}
if (value)
{
Expression *e = value;
assert(e->dyncast() == DYNCAST_EXPRESSION);
e = e->semantic(sc);
e = resolveProperties(sc, e);
e = e->ctfeInterpret();
if (e->op == TOKerror)
goto Lerrors;
if (first && !ed->memtype && !ed->isAnonymous())
{
ed->memtype = e->type;
if (ed->memtype->ty == Terror)
{
ed->errors = true;
goto Lerrors;
}
if (ed->memtype->ty != Terror)
{
/* Bugzilla 11746: All of named enum members should have same type
* with the first member. If the following members were referenced
* during the first member semantic, their types should be unified.
*/
for (size_t i = 0; i < ed->members->dim; i++)
{
EnumMember *em = (*ed->members)[i]->isEnumMember();
if (!em || em == this || em->semanticRun < PASSsemanticdone || em->type)
continue;
//printf("[%d] em = %s, em->semanticRun = %d\n", i, toChars(), em->semanticRun);
Expression *e = em->value;
e = e->implicitCastTo(sc, ed->memtype);
e = e->ctfeInterpret();
e = e->castTo(sc, ed->type);
if (e->op == TOKerror)
ed->errors = true;
em->value = e;
}
if (ed->errors)
{
ed->memtype = Type::terror;
goto Lerrors;
}
}
}
if (ed->memtype && !type)
{
e = e->implicitCastTo(sc, ed->memtype);
e = e->ctfeInterpret();
// save origValue for better json output
origValue = e;
if (!ed->isAnonymous())
e = e->castTo(sc, ed->type);
}
else if (type)
{
e = e->implicitCastTo(sc, type);
e = e->ctfeInterpret();
assert(ed->isAnonymous());
// save origValue for better json output
origValue = e;
}
value = e;
}
else if (first)
{
Type *t;
if (ed->memtype)
t = ed->memtype;
else
{
t = Type::tint32;
if (!ed->isAnonymous())
ed->memtype = t;
}
Expression *e = new IntegerExp(loc, 0, Type::tint32);
e = e->implicitCastTo(sc, t);
e = e->ctfeInterpret();
// save origValue for better json output
origValue = e;
if (!ed->isAnonymous())
e = e->castTo(sc, ed->type);
value = e;
}
else
{
/* Find the previous enum member,
* and set this to be the previous value + 1
*/
EnumMember *emprev = NULL;
for (size_t i = 0; i < ed->members->dim; i++)
{
EnumMember *em = (*ed->members)[i]->isEnumMember();
if (em)
{
if (em == this)
break;
emprev = em;
}
}
assert(emprev);
if (emprev->semanticRun < PASSsemanticdone) // if forward reference
emprev->semantic(emprev->scope); // resolve it
if (emprev->errors)
goto Lerrors;
Expression *eprev = emprev->value;
Type *tprev = eprev->type->equals(ed->type) ? ed->memtype : eprev->type;
Expression *emax = tprev->getProperty(ed->loc, Id::max, 0);
emax = emax->semantic(sc);
emax = emax->ctfeInterpret();
// Set value to (eprev + 1).
// But first check that (eprev != emax)
assert(eprev);
Expression *e = new EqualExp(TOKequal, loc, eprev, emax);
e = e->semantic(sc);
e = e->ctfeInterpret();
if (e->toInteger())
{
error("initialization with (%s.%s + 1) causes overflow for type '%s'", emprev->ed->toChars(), emprev->toChars(), ed->type->toBasetype()->toChars());
goto Lerrors;
}
// Now set e to (eprev + 1)
e = new AddExp(loc, eprev, new IntegerExp(loc, 1, Type::tint32));
e = e->semantic(sc);
e = e->castTo(sc, eprev->type);
e = e->ctfeInterpret();
// save origValue (without cast) for better json output
if (e->op != TOKerror) // avoid duplicate diagnostics
{
assert(emprev->origValue);
origValue = new AddExp(loc, emprev->origValue, new IntegerExp(loc, 1, Type::tint32));
origValue = origValue->semantic(sc);
origValue = origValue->ctfeInterpret();
}
if (e->op == TOKerror)
goto Lerrors;
if (e->type->isfloating())
{
// Check that e != eprev (not always true for floats)
Expression *etest = new EqualExp(TOKequal, loc, e, eprev);
etest = etest->semantic(sc);
etest = etest->ctfeInterpret();
if (etest->toInteger())
{
error("has inexact value, due to loss of precision");
goto Lerrors;
}
}
value = e;
}
assert(origValue);
semanticRun = PASSsemanticdone;
}