ExprListPtr clone(ExprListPtr x)
{
ExprListPtr out = new ExprList();
for (unsigned i = 0; i < x->size(); ++i)
out->add(clone(x->exprs[i]));
return out;
}
static void initializeVariantType(VariantTypePtr t) {
assert(!t->initialized);
EnvPtr variantEnv = new Env(t->variant->env);
{
const vector<IdentifierPtr> ¶ms = t->variant->params;
IdentifierPtr varParam = t->variant->varParam;
assert(params.size() <= t->params.size());
for (unsigned j = 0; j < params.size(); ++j)
addLocal(variantEnv, params[j], t->params[j]);
if (varParam.ptr()) {
MultiStaticPtr ms = new MultiStatic();
for (unsigned j = params.size(); j < t->params.size(); ++j)
ms->add(t->params[j]);
addLocal(variantEnv, varParam, ms.ptr());
}
else {
assert(params.size() == t->params.size());
}
}
ExprListPtr defaultInstances = t->variant->defaultInstances;
for (unsigned i = 0; i < defaultInstances->size(); ++i) {
ExprPtr x = defaultInstances->exprs[i];
TypePtr memberType = evaluateType(x, variantEnv);
t->memberTypes.push_back(memberType);
}
const vector<InstancePtr> &instances = t->variant->instances;
for (unsigned i = 0; i < instances.size(); ++i) {
InstancePtr x = instances[i];
vector<PatternCellPtr> cells;
vector<MultiPatternCellPtr> multiCells;
const vector<PatternVar> &pvars = x->patternVars;
EnvPtr patternEnv = new Env(x->env);
for (unsigned j = 0; j < pvars.size(); ++j) {
if (pvars[j].isMulti) {
MultiPatternCellPtr multiCell = new MultiPatternCell(NULL);
multiCells.push_back(multiCell);
cells.push_back(NULL);
addLocal(patternEnv, pvars[j].name, multiCell.ptr());
}
else {
PatternCellPtr cell = new PatternCell(NULL);
cells.push_back(cell);
multiCells.push_back(NULL);
addLocal(patternEnv, pvars[j].name, cell.ptr());
}
}
PatternPtr pattern = evaluateOnePattern(x->target, patternEnv);
if (!unifyPatternObj(pattern, t.ptr()))
continue;
EnvPtr staticEnv = new Env(x->env);
for (unsigned j = 0; j < pvars.size(); ++j) {
if (pvars[j].isMulti) {
MultiStaticPtr ms = derefDeep(multiCells[j].ptr());
if (!ms)
error(pvars[j].name, "unbound pattern variable");
addLocal(staticEnv, pvars[j].name, ms.ptr());
}
else {
ObjectPtr v = derefDeep(cells[j].ptr());
if (!v)
error(pvars[j].name, "unbound pattern variable");
addLocal(staticEnv, pvars[j].name, v.ptr());
}
}
if (x->predicate.ptr())
if (!evaluateBool(x->predicate, staticEnv))
continue;
TypePtr memberType = evaluateType(x->member, staticEnv);
t->memberTypes.push_back(memberType);
}
RecordPtr reprRecord = getVariantReprRecord();
vector<ObjectPtr> params;
for (unsigned i = 0; i < t->memberTypes.size(); ++i)
params.push_back(t->memberTypes[i].ptr());
t->reprType = recordType(reprRecord, params);
t->initialized = true;
}
void convertFreeVars(ExprListPtr x, EnvPtr env, LambdaContext &ctx)
{
for (unsigned i = 0; i < x->size(); ++i)
convertFreeVars(x->exprs[i], env, ctx);
}