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#include "yql_linear_checker.h"
#include "yql_expr_optimize.h"
#include <yql/essentials/utils/log/log.h>
#include <library/cpp/containers/stack_vector/stack_vec.h>
namespace NYql {
namespace {
bool ValidateLinearTypeAnn(TPositionHandle pos, const TTypeAnnotationNode& type, TExprContext& ctx) {
bool hasError = false;
if (type.IsLinear()) {
// ok
} else if (type.GetKind() == ETypeAnnotationKind::Tuple) {
auto tupleType = type.Cast<TTupleExprType>();
for (const auto& item : tupleType->GetItems()) {
if (!item->HasStaticLinear()) {
continue;
}
if (!item->IsLinear()) {
hasError = true;
break;
}
}
} else if (type.GetKind() == ETypeAnnotationKind::Struct) {
auto structType = type.Cast<TStructExprType>();
for (const auto& item : structType->GetItems()) {
if (!item->GetItemType()->HasStaticLinear()) {
continue;
}
if (!item->GetItemType()->IsLinear()) {
hasError = true;
break;
}
}
} else {
hasError = true;
}
if (hasError) {
ctx.AddError(TIssue(ctx.GetPosition(pos), TStringBuilder() <<
"Linear types can be used either directly or via Struct/Tuple (non-recursive), but got type " <<
type << "\nConsider using ToDynamicLinear function"));
}
return !hasError;
}
class TUsageVisitor
{
public:
// length = 1 for Linear, N for Struct/Tuple
using TUsage = TStackVec<TMaybe<TPositionHandle>, 1>;
TUsageVisitor(TExprContext& ctx)
: Ctx_(ctx)
{}
void Visit(const TExprNode& node, const TExprNode* parent) {
auto [it, inserted] = Visited_.emplace(&node, TUsage{});
if (node.GetTypeAnn()->HasStaticLinear()) {
if (node.GetTypeAnn()->IsLinear()) {
it->second.resize(1);
if (it->second[0]) {
AddError(*it->second[0], parent->Pos(), node.Pos());
return;
} else {
it->second[0] = parent->Pos();
}
} else if (node.GetTypeAnn()->GetKind() == ETypeAnnotationKind::Tuple) {
auto tupleType = node.GetTypeAnn()->Cast<TTupleExprType>();
it->second.resize(tupleType->GetSize());
if (parent->IsCallable("Nth")) {
auto index = FromString<ui32>(parent->Tail().Content());
if (tupleType->GetItems()[index]->IsLinear()) {
if (it->second[index]) {
AddError(*it->second[index], parent->Pos(), node.Pos());
return;
} else {
it->second[index] = parent->Pos();
}
}
} else {
// all items consumed
for (ui32 i = 0; i < tupleType->GetSize(); ++i) {
if (tupleType->GetItems()[i]->IsLinear()) {
if (it->second[i]) {
AddError(*it->second[i], parent->Pos(), node.Pos());
return;
} else {
it->second[i] = parent->Pos();
}
}
}
}
} else {
auto structType = node.GetTypeAnn()->Cast<TStructExprType>();
it->second.resize(structType->GetSize());
if (parent->IsCallable("Member")) {
auto index = structType->FindItem(parent->Tail().Content());
YQL_ENSURE(index);
if (structType->GetItems()[*index]->GetItemType()->IsLinear()) {
if (it->second[*index]) {
AddError(*it->second[*index], parent->Pos(), node.Pos());
return;
} else {
it->second[*index] = parent->Pos();
}
}
} else {
// all items consumed
for (ui32 i = 0; i < structType->GetSize(); ++i) {
if (structType->GetItems()[i]->GetItemType()->IsLinear()) {
if (it->second[i]) {
AddError(*it->second[i], parent->Pos(), node.Pos());
return;
} else {
it->second[i] = parent->Pos();
}
}
}
}
}
}
if (!inserted) {
return;
}
if (node.IsLambda()) {
// validate arg & bodies
bool isValid = true;
for (const auto& arg: node.Head().Children()) {
if (arg->GetTypeAnn()->HasStaticLinear()) {
isValid = false;
AddError(arg->Pos(), "An argument of a lambda should not be a linear type");
}
}
for (ui32 i = 1; i < node.ChildrenSize(); ++i) {
if (node.Child(i)->GetTypeAnn()->HasStaticLinear()) {
isValid = false;
AddError(node.Child(i)->Pos(), "A lambda body should not be a linear type");
}
}
if (!isValid) {
return;
}
for (ui32 i = 1; i < node.ChildrenSize(); ++i) {
Visit(*node.Child(i), parent);
}
} else {
for (const auto& child : node.Children()) {
Visit(*child, &node);
}
}
}
bool HasErrors() const {
return HasErrors_;
}
private:
void AddError(TPositionHandle firstUsage, TPositionHandle secondUsage, TPositionHandle linear) {
HasErrors_ = true;
auto first = MakeIntrusive<TIssue>(Ctx_.GetPosition(firstUsage), "First usage of the value");
auto second = MakeIntrusive<TIssue>(Ctx_.GetPosition(secondUsage), "Second usage of the value");
auto main = TIssue(Ctx_.GetPosition(linear), "The linear value has already been used");
main.AddSubIssue(first);
main.AddSubIssue(second);
Ctx_.AddError(main);
}
void AddError(TPositionHandle pos, const TString& message) {
HasErrors_ = true;
Ctx_.AddError(TIssue(Ctx_.GetPosition(pos), message));
}
private:
TExprContext& Ctx_;
bool HasErrors_ = false;
TNodeMap<TUsage> Visited_;
};
}
bool ValidateLinearTypes(const TExprNode& root, TExprContext& ctx) {
bool hasErrors = false;
THashSet<const TTypeAnnotationNode*> scannedTypes;
VisitExpr(root, [&](const TExprNode& node) {
if (node.GetTypeAnn()->HasStaticLinear()) {
auto [_, inserted] = scannedTypes.emplace(node.GetTypeAnn());
if (inserted) {
if (!ValidateLinearTypeAnn(node.Pos(), *node.GetTypeAnn(), ctx)) {
hasErrors = true;
return false;
}
}
}
return true;
});
YQL_CLOG(INFO, Core) << "Scanned " << scannedTypes.size() << " static linear types";
if (hasErrors) {
return false;
}
TUsageVisitor visitor(ctx);
visitor.Visit(root, nullptr);
return !visitor.HasErrors();
}
}
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