mirror of
https://github.com/luau-lang/luau.git
synced 2024-12-13 21:40:43 +00:00
55a026811a
* Run clang-format * Contains a preliminary implementation of deferred constraint resolution * Reduce stack usage by some recursive functions * Fix a bug when smartCloning a BoundTypeVar * Remove some GC related flags from VM
162 lines
4.4 KiB
C++
162 lines
4.4 KiB
C++
// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
|
|
|
|
#pragma once
|
|
|
|
#include <memory>
|
|
#include <vector>
|
|
|
|
#include "Luau/Ast.h"
|
|
#include "Luau/Module.h"
|
|
#include "Luau/Symbol.h"
|
|
#include "Luau/TypeVar.h"
|
|
#include "Luau/Variant.h"
|
|
|
|
namespace Luau
|
|
{
|
|
|
|
struct Scope2;
|
|
|
|
// subType <: superType
|
|
struct SubtypeConstraint
|
|
{
|
|
TypeId subType;
|
|
TypeId superType;
|
|
};
|
|
|
|
// subPack <: superPack
|
|
struct PackSubtypeConstraint
|
|
{
|
|
TypePackId subPack;
|
|
TypePackId superPack;
|
|
};
|
|
|
|
// subType ~ gen superType
|
|
struct GeneralizationConstraint
|
|
{
|
|
TypeId subType;
|
|
TypeId superType;
|
|
Scope2* scope;
|
|
};
|
|
|
|
// subType ~ inst superType
|
|
struct InstantiationConstraint
|
|
{
|
|
TypeId subType;
|
|
TypeId superType;
|
|
};
|
|
|
|
using ConstraintV = Variant<SubtypeConstraint, PackSubtypeConstraint, GeneralizationConstraint, InstantiationConstraint>;
|
|
using ConstraintPtr = std::unique_ptr<struct Constraint>;
|
|
|
|
struct Constraint
|
|
{
|
|
Constraint(ConstraintV&& c);
|
|
Constraint(ConstraintV&& c, std::vector<Constraint*> dependencies);
|
|
|
|
Constraint(const Constraint&) = delete;
|
|
Constraint& operator=(const Constraint&) = delete;
|
|
|
|
ConstraintV c;
|
|
std::vector<Constraint*> dependencies;
|
|
};
|
|
|
|
inline Constraint& asMutable(const Constraint& c)
|
|
{
|
|
return const_cast<Constraint&>(c);
|
|
}
|
|
|
|
template<typename T>
|
|
T* getMutable(Constraint& c)
|
|
{
|
|
return ::Luau::get_if<T>(&c.c);
|
|
}
|
|
|
|
template<typename T>
|
|
const T* get(const Constraint& c)
|
|
{
|
|
return getMutable<T>(asMutable(c));
|
|
}
|
|
|
|
struct Scope2
|
|
{
|
|
// The parent scope of this scope. Null if there is no parent (i.e. this
|
|
// is the module-level scope).
|
|
Scope2* parent = nullptr;
|
|
// All the children of this scope.
|
|
std::vector<Scope2*> children;
|
|
std::unordered_map<Symbol, TypeId> bindings; // TODO: I think this can be a DenseHashMap
|
|
TypePackId returnType;
|
|
// All constraints belonging to this scope.
|
|
std::vector<ConstraintPtr> constraints;
|
|
|
|
std::optional<TypeId> lookup(Symbol sym);
|
|
};
|
|
|
|
struct ConstraintGraphBuilder
|
|
{
|
|
// A list of all the scopes in the module. This vector holds ownership of the
|
|
// scope pointers; the scopes themselves borrow pointers to other scopes to
|
|
// define the scope hierarchy.
|
|
std::vector<std::pair<Location, std::unique_ptr<Scope2>>> scopes;
|
|
SingletonTypes& singletonTypes;
|
|
TypeArena* const arena;
|
|
// The root scope of the module we're generating constraints for.
|
|
Scope2* rootScope;
|
|
|
|
explicit ConstraintGraphBuilder(TypeArena* arena);
|
|
|
|
/**
|
|
* Fabricates a new free type belonging to a given scope.
|
|
* @param scope the scope the free type belongs to. Must not be null.
|
|
*/
|
|
TypeId freshType(Scope2* scope);
|
|
|
|
/**
|
|
* Fabricates a new free type pack belonging to a given scope.
|
|
* @param scope the scope the free type pack belongs to. Must not be null.
|
|
*/
|
|
TypePackId freshTypePack(Scope2* scope);
|
|
|
|
/**
|
|
* Fabricates a scope that is a child of another scope.
|
|
* @param location the lexical extent of the scope in the source code.
|
|
* @param parent the parent scope of the new scope. Must not be null.
|
|
*/
|
|
Scope2* childScope(Location location, Scope2* parent);
|
|
|
|
/**
|
|
* Adds a new constraint with no dependencies to a given scope.
|
|
* @param scope the scope to add the constraint to. Must not be null.
|
|
* @param cv the constraint variant to add.
|
|
*/
|
|
void addConstraint(Scope2* scope, ConstraintV cv);
|
|
|
|
/**
|
|
* Adds a constraint to a given scope.
|
|
* @param scope the scope to add the constraint to. Must not be null.
|
|
* @param c the constraint to add.
|
|
*/
|
|
void addConstraint(Scope2* scope, std::unique_ptr<Constraint> c);
|
|
|
|
/**
|
|
* The entry point to the ConstraintGraphBuilder. This will construct a set
|
|
* of scopes, constraints, and free types that can be solved later.
|
|
* @param block the root block to generate constraints for.
|
|
*/
|
|
void visit(AstStatBlock* block);
|
|
|
|
void visit(Scope2* scope, AstStat* stat);
|
|
void visit(Scope2* scope, AstStatBlock* block);
|
|
void visit(Scope2* scope, AstStatLocal* local);
|
|
void visit(Scope2* scope, AstStatLocalFunction* local);
|
|
void visit(Scope2* scope, AstStatReturn* local);
|
|
|
|
TypePackId checkPack(Scope2* scope, AstArray<AstExpr*> exprs);
|
|
TypePackId checkPack(Scope2* scope, AstExpr* expr);
|
|
|
|
TypeId check(Scope2* scope, AstExpr* expr);
|
|
};
|
|
|
|
std::vector<const Constraint*> collectConstraints(Scope2* rootScope);
|
|
|
|
} // namespace Luau
|