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Sync to upstream/release/570 (#885)
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Once again, all of our changes this week are for new type solver and the
JIT.

In the new type solver, we fixed cyclic type alias handling and multiple
stability issues.

In the JIT, our main progress was for arm64, where, after lowering 36%
of instructions, we start seeing first Luau functions executing
natively.
For x64, we performed code cleanup and refactoring to allow for future
optimizations.
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@vegorov-rbx
vegorov-rbx committed Mar 31, 2023
1 parent b4ebad4 commit 1212fda
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Showing 86 changed files with 3,543 additions and 1,218 deletions.
18 changes: 15 additions & 3 deletions Analysis/include/Luau/ConstraintSolver.h
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Original file line number Diff line number Diff line change
Expand Up @@ -53,7 +53,6 @@ struct ConstraintSolver
NotNull<BuiltinTypes> builtinTypes;
InternalErrorReporter iceReporter;
NotNull<Normalizer> normalizer;
NotNull<TypeReduction> reducer;
// The entire set of constraints that the solver is trying to resolve.
std::vector<NotNull<Constraint>> constraints;
NotNull<Scope> rootScope;
Expand Down Expand Up @@ -85,8 +84,7 @@ struct ConstraintSolver
DcrLogger* logger;

explicit ConstraintSolver(NotNull<Normalizer> normalizer, NotNull<Scope> rootScope, std::vector<NotNull<Constraint>> constraints,
ModuleName moduleName, NotNull<TypeReduction> reducer, NotNull<ModuleResolver> moduleResolver, std::vector<RequireCycle> requireCycles,
DcrLogger* logger);
ModuleName moduleName, NotNull<ModuleResolver> moduleResolver, std::vector<RequireCycle> requireCycles, DcrLogger* logger);

// Randomize the order in which to dispatch constraints
void randomize(unsigned seed);
Expand Down Expand Up @@ -219,6 +217,20 @@ struct ConstraintSolver
void reportError(TypeError e);

private:

/** Helper used by tryDispatch(SubtypeConstraint) and
* tryDispatch(PackSubtypeConstraint)
*
* Attempts to unify subTy with superTy. If doing so would require unifying
* BlockedTypes, fail and block the constraint on those BlockedTypes.
*
* If unification fails, replace all free types with errorType.
*
* If unification succeeds, unblock every type changed by the unification.
*/
template <typename TID>
bool tryUnify(NotNull<const Constraint> constraint, TID subTy, TID superTy);

/**
* Marks a constraint as being blocked on a type or type pack. The constraint
* solver will not attempt to dispatch blocked constraints until their
Expand Down
6 changes: 1 addition & 5 deletions Analysis/include/Luau/Normalize.h
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Original file line number Diff line number Diff line change
Expand Up @@ -191,12 +191,8 @@ struct NormalizedClassType
// this type may contain `error`.
struct NormalizedFunctionType
{
NormalizedFunctionType();

bool isTop = false;
// TODO: Remove this wrapping optional when clipping
// FFlagLuauNegatedFunctionTypes.
std::optional<TypeIds> parts;
TypeIds parts;

void resetToNever();
void resetToTop();
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6 changes: 3 additions & 3 deletions Analysis/include/Luau/Scope.h
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Expand Up @@ -55,11 +55,11 @@ struct Scope
std::optional<TypeId> lookup(DefId def) const;
std::optional<std::pair<Binding*, Scope*>> lookupEx(Symbol sym);

std::optional<TypeFun> lookupType(const Name& name);
std::optional<TypeFun> lookupImportedType(const Name& moduleAlias, const Name& name);
std::optional<TypeFun> lookupType(const Name& name) const;
std::optional<TypeFun> lookupImportedType(const Name& moduleAlias, const Name& name) const;

std::unordered_map<Name, TypePackId> privateTypePackBindings;
std::optional<TypePackId> lookupPack(const Name& name);
std::optional<TypePackId> lookupPack(const Name& name) const;

// WARNING: This function linearly scans for a string key of equal value! It is thus O(n**2)
std::optional<Binding> linearSearchForBinding(const std::string& name, bool traverseScopeChain = true) const;
Expand Down
6 changes: 3 additions & 3 deletions Analysis/include/Luau/TypeInfer.h
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Expand Up @@ -79,7 +79,8 @@ struct GlobalTypes
// within a program are borrowed pointers into this set.
struct TypeChecker
{
explicit TypeChecker(const GlobalTypes& globals, ModuleResolver* resolver, NotNull<BuiltinTypes> builtinTypes, InternalErrorReporter* iceHandler);
explicit TypeChecker(
const ScopePtr& globalScope, ModuleResolver* resolver, NotNull<BuiltinTypes> builtinTypes, InternalErrorReporter* iceHandler);
TypeChecker(const TypeChecker&) = delete;
TypeChecker& operator=(const TypeChecker&) = delete;

Expand Down Expand Up @@ -367,8 +368,7 @@ struct TypeChecker
*/
std::vector<TypeId> unTypePack(const ScopePtr& scope, TypePackId pack, size_t expectedLength, const Location& location);

// TODO: only const version of global scope should be available to make sure nothing else is modified inside of from users of TypeChecker
const GlobalTypes& globals;
const ScopePtr& globalScope;

ModuleResolver* resolver;
ModulePtr currentModule;
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22 changes: 4 additions & 18 deletions Analysis/src/AstQuery.cpp
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Expand Up @@ -11,8 +11,6 @@

#include <algorithm>

LUAU_FASTFLAG(LuauCompleteTableKeysBetter);

namespace Luau
{

Expand All @@ -31,24 +29,12 @@ struct AutocompleteNodeFinder : public AstVisitor

bool visit(AstExpr* expr) override
{
if (FFlag::LuauCompleteTableKeysBetter)
{
if (expr->location.begin <= pos && pos <= expr->location.end)
{
ancestry.push_back(expr);
return true;
}
return false;
}
else
if (expr->location.begin <= pos && pos <= expr->location.end)
{
if (expr->location.begin < pos && pos <= expr->location.end)
{
ancestry.push_back(expr);
return true;
}
return false;
ancestry.push_back(expr);
return true;
}
return false;
}

bool visit(AstStat* stat) override
Expand Down
51 changes: 18 additions & 33 deletions Analysis/src/Autocomplete.cpp
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Expand Up @@ -13,7 +13,6 @@
#include <unordered_set>
#include <utility>

LUAU_FASTFLAGVARIABLE(LuauCompleteTableKeysBetter, false);
LUAU_FASTFLAGVARIABLE(LuauAutocompleteSkipNormalization, false);

static const std::unordered_set<std::string> kStatementStartingKeywords = {
Expand Down Expand Up @@ -981,25 +980,14 @@ T* extractStat(const std::vector<AstNode*>& ancestry)
AstNode* grandParent = ancestry.size() >= 3 ? ancestry.rbegin()[2] : nullptr;
AstNode* greatGrandParent = ancestry.size() >= 4 ? ancestry.rbegin()[3] : nullptr;

if (FFlag::LuauCompleteTableKeysBetter)
{
if (!grandParent)
return nullptr;

if (T* t = parent->as<T>(); t && grandParent->is<AstStatBlock>())
return t;
if (!grandParent)
return nullptr;

if (!greatGrandParent)
return nullptr;
}
else
{
if (T* t = parent->as<T>(); t && parent->is<AstStatBlock>())
return t;
if (T* t = parent->as<T>(); t && grandParent->is<AstStatBlock>())
return t;

if (!grandParent || !greatGrandParent)
return nullptr;
}
if (!greatGrandParent)
return nullptr;

if (T* t = greatGrandParent->as<T>(); t && grandParent->is<AstStatBlock>() && parent->is<AstStatError>() && isIdentifier(node))
return t;
Expand Down Expand Up @@ -1533,23 +1521,20 @@ static AutocompleteResult autocomplete(const SourceModule& sourceModule, const M
{
auto result = autocompleteProps(*module, typeArena, builtinTypes, *it, PropIndexType::Key, ancestry);

if (FFlag::LuauCompleteTableKeysBetter)
{
if (auto nodeIt = module->astExpectedTypes.find(node->asExpr()))
autocompleteStringSingleton(*nodeIt, !node->is<AstExprConstantString>(), result);
if (auto nodeIt = module->astExpectedTypes.find(node->asExpr()))
autocompleteStringSingleton(*nodeIt, !node->is<AstExprConstantString>(), result);

if (!key)
if (!key)
{
// If there is "no key," it may be that the user
// intends for the current token to be the key, but
// has yet to type the `=` sign.
//
// If the key type is a union of singleton strings,
// suggest those too.
if (auto ttv = get<TableType>(follow(*it)); ttv && ttv->indexer)
{
// If there is "no key," it may be that the user
// intends for the current token to be the key, but
// has yet to type the `=` sign.
//
// If the key type is a union of singleton strings,
// suggest those too.
if (auto ttv = get<TableType>(follow(*it)); ttv && ttv->indexer)
{
autocompleteStringSingleton(ttv->indexer->indexType, false, result);
}
autocompleteStringSingleton(ttv->indexer->indexType, false, result);
}
}

Expand Down
25 changes: 9 additions & 16 deletions Analysis/src/BuiltinDefinitions.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -15,8 +15,6 @@

#include <algorithm>

LUAU_FASTFLAGVARIABLE(LuauDeprecateTableGetnForeach, false)

/** FIXME: Many of these type definitions are not quite completely accurate.
*
* Some of them require richer generics than we have. For instance, we do not yet have a way to talk
Expand Down Expand Up @@ -298,13 +296,10 @@ void registerBuiltinGlobals(TypeChecker& typeChecker, GlobalTypes& globals)
ttv->props["freeze"] = makeProperty(makeFunction(arena, std::nullopt, {tabTy}, {tabTy}), "@luau/global/table.freeze");
ttv->props["clone"] = makeProperty(makeFunction(arena, std::nullopt, {tabTy}, {tabTy}), "@luau/global/table.clone");

if (FFlag::LuauDeprecateTableGetnForeach)
{
ttv->props["getn"].deprecated = true;
ttv->props["getn"].deprecatedSuggestion = "#";
ttv->props["foreach"].deprecated = true;
ttv->props["foreachi"].deprecated = true;
}
ttv->props["getn"].deprecated = true;
ttv->props["getn"].deprecatedSuggestion = "#";
ttv->props["foreach"].deprecated = true;
ttv->props["foreachi"].deprecated = true;

attachMagicFunction(ttv->props["pack"].type, magicFunctionPack);
attachDcrMagicFunction(ttv->props["pack"].type, dcrMagicFunctionPack);
Expand Down Expand Up @@ -401,15 +396,13 @@ void registerBuiltinGlobals(Frontend& frontend)
ttv->props["freeze"] = makeProperty(makeFunction(arena, std::nullopt, {tabTy}, {tabTy}), "@luau/global/table.freeze");
ttv->props["clone"] = makeProperty(makeFunction(arena, std::nullopt, {tabTy}, {tabTy}), "@luau/global/table.clone");

if (FFlag::LuauDeprecateTableGetnForeach)
{
ttv->props["getn"].deprecated = true;
ttv->props["getn"].deprecatedSuggestion = "#";
ttv->props["foreach"].deprecated = true;
ttv->props["foreachi"].deprecated = true;
}
ttv->props["getn"].deprecated = true;
ttv->props["getn"].deprecatedSuggestion = "#";
ttv->props["foreach"].deprecated = true;
ttv->props["foreachi"].deprecated = true;

attachMagicFunction(ttv->props["pack"].type, magicFunctionPack);
attachDcrMagicFunction(ttv->props["pack"].type, dcrMagicFunctionPack);
}

attachMagicFunction(getGlobalBinding(globals, "require"), magicFunctionRequire);
Expand Down
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