luau/Analysis/include/Luau/ConstraintGraphBuilder.h

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// 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>
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#include <unordered_map>
#include "Luau/Ast.h"
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#include "Luau/Constraint.h"
#include "Luau/Module.h"
#include "Luau/ModuleResolver.h"
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#include "Luau/NotNull.h"
#include "Luau/Symbol.h"
#include "Luau/TypeVar.h"
#include "Luau/Variant.h"
namespace Luau
{
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struct Scope;
using ScopePtr = std::shared_ptr<Scope>;
struct DcrLogger;
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.
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std::vector<std::pair<Location, ScopePtr>> scopes;
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ModuleName moduleName;
ModulePtr module;
NotNull<SingletonTypes> singletonTypes;
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const NotNull<TypeArena> arena;
// The root scope of the module we're generating constraints for.
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// This is null when the CGB is initially constructed.
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Scope* rootScope;
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// A mapping of AST node to TypeId.
DenseHashMap<const AstExpr*, TypeId> astTypes{nullptr};
// A mapping of AST node to TypePackId.
DenseHashMap<const AstExpr*, TypePackId> astTypePacks{nullptr};
DenseHashMap<const AstExpr*, TypeId> astOriginalCallTypes{nullptr};
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// Types resolved from type annotations. Analogous to astTypes.
DenseHashMap<const AstType*, TypeId> astResolvedTypes{nullptr};
// Type packs resolved from type annotations. Analogous to astTypePacks.
DenseHashMap<const AstTypePack*, TypePackId> astResolvedTypePacks{nullptr};
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// Defining scopes for AST nodes.
DenseHashMap<const AstStatTypeAlias*, ScopePtr> astTypeAliasDefiningScopes{nullptr};
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int recursionCount = 0;
// It is pretty uncommon for constraint generation to itself produce errors, but it can happen.
std::vector<TypeError> errors;
// Needed to resolve modules to make 'require' import types properly.
NotNull<ModuleResolver> moduleResolver;
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// Occasionally constraint generation needs to produce an ICE.
const NotNull<InternalErrorReporter> ice;
ScopePtr globalScope;
DcrLogger* logger;
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ConstraintGraphBuilder(const ModuleName& moduleName, ModulePtr module, TypeArena* arena, NotNull<ModuleResolver> moduleResolver,
NotNull<SingletonTypes> singletonTypes, NotNull<InternalErrorReporter> ice, const ScopePtr& globalScope, DcrLogger* logger);
/**
* Fabricates a new free type belonging to a given scope.
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* @param scope the scope the free type belongs to.
*/
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TypeId freshType(const ScopePtr& scope);
/**
* Fabricates a new free type pack belonging to a given scope.
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* @param scope the scope the free type pack belongs to.
*/
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TypePackId freshTypePack(const ScopePtr& scope);
/**
* Fabricates a scope that is a child of another scope.
* @param node the lexical node that the scope belongs to.
* @param parent the parent scope of the new scope. Must not be null.
*/
ScopePtr childScope(AstNode* node, const ScopePtr& parent);
/**
* Adds a new constraint with no dependencies to a given scope.
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* @param scope the scope to add the constraint to.
* @param cv the constraint variant to add.
*/
void addConstraint(const ScopePtr& scope, const Location& location, 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.
*/
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void addConstraint(const ScopePtr& 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);
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void visitBlockWithoutChildScope(const ScopePtr& scope, AstStatBlock* block);
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void visit(const ScopePtr& scope, AstStat* stat);
void visit(const ScopePtr& scope, AstStatBlock* block);
void visit(const ScopePtr& scope, AstStatLocal* local);
void visit(const ScopePtr& scope, AstStatFor* for_);
void visit(const ScopePtr& scope, AstStatForIn* forIn);
void visit(const ScopePtr& scope, AstStatWhile* while_);
void visit(const ScopePtr& scope, AstStatRepeat* repeat);
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void visit(const ScopePtr& scope, AstStatLocalFunction* function);
void visit(const ScopePtr& scope, AstStatFunction* function);
void visit(const ScopePtr& scope, AstStatReturn* ret);
void visit(const ScopePtr& scope, AstStatAssign* assign);
void visit(const ScopePtr& scope, AstStatCompoundAssign* assign);
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void visit(const ScopePtr& scope, AstStatIf* ifStatement);
void visit(const ScopePtr& scope, AstStatTypeAlias* alias);
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void visit(const ScopePtr& scope, AstStatDeclareGlobal* declareGlobal);
void visit(const ScopePtr& scope, AstStatDeclareClass* declareClass);
void visit(const ScopePtr& scope, AstStatDeclareFunction* declareFunction);
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TypePackId checkPack(const ScopePtr& scope, AstArray<AstExpr*> exprs);
TypePackId checkPack(const ScopePtr& scope, AstExpr* expr);
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/**
* Checks an expression that is expected to evaluate to one type.
* @param scope the scope the expression is contained within.
* @param expr the expression to check.
* @return the type of the expression.
*/
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TypeId check(const ScopePtr& scope, AstExpr* expr);
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TypeId checkExprTable(const ScopePtr& scope, AstExprTable* expr);
TypeId check(const ScopePtr& scope, AstExprIndexName* indexName);
TypeId check(const ScopePtr& scope, AstExprIndexExpr* indexExpr);
TypeId check(const ScopePtr& scope, AstExprUnary* unary);
TypeId check(const ScopePtr& scope, AstExprBinary* binary);
TypeId check(const ScopePtr& scope, AstExprIfElse* ifElse);
TypeId check(const ScopePtr& scope, AstExprTypeAssertion* typeAssert);
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struct FunctionSignature
{
// The type of the function.
TypeId signature;
// The scope that encompasses the function's signature. May be nullptr
// if there was no need for a signature scope (the function has no
// generics).
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ScopePtr signatureScope;
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// The scope that encompasses the function's body. Is a child scope of
// signatureScope, if present.
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ScopePtr bodyScope;
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};
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FunctionSignature checkFunctionSignature(const ScopePtr& parent, AstExprFunction* fn);
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/**
* Checks the body of a function expression.
* @param scope the interior scope of the body of the function.
* @param fn the function expression to check.
*/
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void checkFunctionBody(const ScopePtr& scope, AstExprFunction* fn);
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/**
* Resolves a type from its AST annotation.
* @param scope the scope that the type annotation appears within.
* @param ty the AST annotation to resolve.
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* @param topLevel whether the annotation is a "top-level" annotation.
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* @return the type of the AST annotation.
**/
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TypeId resolveType(const ScopePtr& scope, AstType* ty, bool topLevel = false);
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/**
* Resolves a type pack from its AST annotation.
* @param scope the scope that the type annotation appears within.
* @param tp the AST annotation to resolve.
* @return the type pack of the AST annotation.
**/
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TypePackId resolveTypePack(const ScopePtr& scope, AstTypePack* tp);
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TypePackId resolveTypePack(const ScopePtr& scope, const AstTypeList& list);
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std::vector<std::pair<Name, GenericTypeDefinition>> createGenerics(const ScopePtr& scope, AstArray<AstGenericType> generics);
std::vector<std::pair<Name, GenericTypePackDefinition>> createGenericPacks(const ScopePtr& scope, AstArray<AstGenericTypePack> packs);
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TypeId flattenPack(const ScopePtr& scope, Location location, TypePackId tp);
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void reportError(Location location, TypeErrorData err);
void reportCodeTooComplex(Location location);
/** Scan the program for global definitions.
*
* ConstraintGraphBuilder needs to differentiate between globals and accesses to undefined symbols. Doing this "for
* real" in a general way is going to be pretty hard, so we are choosing not to tackle that yet. For now, we do an
* initial scan of the AST and note what globals are defined.
*/
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void prepopulateGlobalScope(const ScopePtr& globalScope, AstStatBlock* program);
};
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/**
* Collects a vector of borrowed constraints from the scope and all its child
* scopes. It is important to only call this function when you're done adding
* constraints to the scope or its descendants, lest the borrowed pointers
* become invalid due to a container reallocation.
* @param rootScope the root scope of the scope graph to collect constraints
* from.
* @return a list of pointers to constraints contained within the scope graph.
* None of these pointers should be null.
*/
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std::vector<NotNull<Constraint>> collectConstraints(NotNull<Scope> rootScope);
} // namespace Luau