214 lines
8.0 KiB
C++
214 lines
8.0 KiB
C++
// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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#pragma once
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// Do not include LValue. It should never be used here.
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#include "Luau/Ast.h"
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#include "Luau/ControlFlow.h"
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#include "Luau/DenseHash.h"
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#include "Luau/Def.h"
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#include "Luau/Symbol.h"
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#include "Luau/TypedAllocator.h"
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#include <unordered_map>
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namespace Luau
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{
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struct RefinementKey
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{
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const RefinementKey* parent = nullptr;
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DefId def;
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std::optional<std::string> propName;
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};
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struct RefinementKeyArena
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{
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TypedAllocator<RefinementKey> allocator;
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const RefinementKey* leaf(DefId def);
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const RefinementKey* node(const RefinementKey* parent, DefId def, const std::string& propName);
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};
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struct DataFlowGraph
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{
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DataFlowGraph(DataFlowGraph&&) = default;
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DataFlowGraph& operator=(DataFlowGraph&&) = default;
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DefId getDef(const AstExpr* expr) const;
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// Look up for the rvalue def for a compound assignment.
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std::optional<DefId> getRValueDefForCompoundAssign(const AstExpr* expr) const;
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DefId getDef(const AstLocal* local) const;
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DefId getDef(const AstStatDeclareGlobal* global) const;
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DefId getDef(const AstStatDeclareFunction* func) const;
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const RefinementKey* getRefinementKey(const AstExpr* expr) const;
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private:
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DataFlowGraph() = default;
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DataFlowGraph(const DataFlowGraph&) = delete;
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DataFlowGraph& operator=(const DataFlowGraph&) = delete;
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DefArena defArena;
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RefinementKeyArena keyArena;
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DenseHashMap<const AstExpr*, const Def*> astDefs{nullptr};
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// Sometimes we don't have the AstExprLocal* but we have AstLocal*, and sometimes we need to extract that DefId.
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DenseHashMap<const AstLocal*, const Def*> localDefs{nullptr};
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// There's no AstStatDeclaration, and it feels useless to introduce it just to enforce an invariant in one place.
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// All keys in this maps are really only statements that ambiently declares a symbol.
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DenseHashMap<const AstStat*, const Def*> declaredDefs{nullptr};
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// Compound assignments are in a weird situation where the local being assigned to is also being used at its
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// previous type implicitly in an rvalue position. This map provides the previous binding.
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DenseHashMap<const AstExpr*, const Def*> compoundAssignDefs{nullptr};
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DenseHashMap<const AstExpr*, const RefinementKey*> astRefinementKeys{nullptr};
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friend struct DataFlowGraphBuilder;
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};
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struct DfgScope
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{
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enum ScopeType
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{
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Linear,
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Loop,
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Function,
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};
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DfgScope* parent;
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ScopeType scopeType;
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using Bindings = DenseHashMap<Symbol, const Def*>;
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using Props = DenseHashMap<const Def*, std::unordered_map<std::string, const Def*>>;
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Bindings bindings{Symbol{}};
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Props props{nullptr};
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std::optional<DefId> lookup(Symbol symbol) const;
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std::optional<DefId> lookup(DefId def, const std::string& key) const;
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void inherit(const DfgScope* childScope);
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bool canUpdateDefinition(Symbol symbol) const;
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bool canUpdateDefinition(DefId def, const std::string& key) const;
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};
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struct DataFlowResult
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{
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DefId def;
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const RefinementKey* parent = nullptr;
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};
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struct DataFlowGraphBuilder
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{
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static DataFlowGraph build(AstStatBlock* root, NotNull<struct InternalErrorReporter> handle);
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private:
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DataFlowGraphBuilder() = default;
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DataFlowGraphBuilder(const DataFlowGraphBuilder&) = delete;
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DataFlowGraphBuilder& operator=(const DataFlowGraphBuilder&) = delete;
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DataFlowGraph graph;
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NotNull<DefArena> defArena{&graph.defArena};
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NotNull<RefinementKeyArena> keyArena{&graph.keyArena};
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struct InternalErrorReporter* handle = nullptr;
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DfgScope* moduleScope = nullptr;
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std::vector<std::unique_ptr<DfgScope>> scopes;
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struct FunctionCapture
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{
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std::vector<DefId> captureDefs;
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std::vector<DefId> allVersions;
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size_t versionOffset = 0;
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};
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DenseHashMap<Symbol, FunctionCapture> captures{Symbol{}};
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void resolveCaptures();
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DfgScope* childScope(DfgScope* scope, DfgScope::ScopeType scopeType = DfgScope::Linear);
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void join(DfgScope* p, DfgScope* a, DfgScope* b);
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void joinBindings(DfgScope* p, const DfgScope& a, const DfgScope& b);
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void joinProps(DfgScope* p, const DfgScope& a, const DfgScope& b);
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DefId lookup(DfgScope* scope, Symbol symbol);
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DefId lookup(DfgScope* scope, DefId def, const std::string& key);
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ControlFlow visit(DfgScope* scope, AstStatBlock* b);
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ControlFlow visitBlockWithoutChildScope(DfgScope* scope, AstStatBlock* b);
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ControlFlow visit(DfgScope* scope, AstStat* s);
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ControlFlow visit(DfgScope* scope, AstStatIf* i);
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ControlFlow visit(DfgScope* scope, AstStatWhile* w);
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ControlFlow visit(DfgScope* scope, AstStatRepeat* r);
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ControlFlow visit(DfgScope* scope, AstStatBreak* b);
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ControlFlow visit(DfgScope* scope, AstStatContinue* c);
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ControlFlow visit(DfgScope* scope, AstStatReturn* r);
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ControlFlow visit(DfgScope* scope, AstStatExpr* e);
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ControlFlow visit(DfgScope* scope, AstStatLocal* l);
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ControlFlow visit(DfgScope* scope, AstStatFor* f);
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ControlFlow visit(DfgScope* scope, AstStatForIn* f);
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ControlFlow visit(DfgScope* scope, AstStatAssign* a);
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ControlFlow visit(DfgScope* scope, AstStatCompoundAssign* c);
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ControlFlow visit(DfgScope* scope, AstStatFunction* f);
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ControlFlow visit(DfgScope* scope, AstStatLocalFunction* l);
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ControlFlow visit(DfgScope* scope, AstStatTypeAlias* t);
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ControlFlow visit(DfgScope* scope, AstStatDeclareGlobal* d);
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ControlFlow visit(DfgScope* scope, AstStatDeclareFunction* d);
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ControlFlow visit(DfgScope* scope, AstStatDeclareClass* d);
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ControlFlow visit(DfgScope* scope, AstStatError* error);
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DataFlowResult visitExpr(DfgScope* scope, AstExpr* e);
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DataFlowResult visitExpr(DfgScope* scope, AstExprGroup* group);
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DataFlowResult visitExpr(DfgScope* scope, AstExprLocal* l);
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DataFlowResult visitExpr(DfgScope* scope, AstExprGlobal* g);
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DataFlowResult visitExpr(DfgScope* scope, AstExprCall* c);
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DataFlowResult visitExpr(DfgScope* scope, AstExprIndexName* i);
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DataFlowResult visitExpr(DfgScope* scope, AstExprIndexExpr* i);
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DataFlowResult visitExpr(DfgScope* scope, AstExprFunction* f);
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DataFlowResult visitExpr(DfgScope* scope, AstExprTable* t);
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DataFlowResult visitExpr(DfgScope* scope, AstExprUnary* u);
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DataFlowResult visitExpr(DfgScope* scope, AstExprBinary* b);
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DataFlowResult visitExpr(DfgScope* scope, AstExprTypeAssertion* t);
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DataFlowResult visitExpr(DfgScope* scope, AstExprIfElse* i);
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DataFlowResult visitExpr(DfgScope* scope, AstExprInterpString* i);
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DataFlowResult visitExpr(DfgScope* scope, AstExprError* error);
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void visitLValue(DfgScope* scope, AstExpr* e, DefId incomingDef, bool isCompoundAssignment = false);
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DefId visitLValue(DfgScope* scope, AstExprLocal* l, DefId incomingDef, bool isCompoundAssignment);
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DefId visitLValue(DfgScope* scope, AstExprGlobal* g, DefId incomingDef, bool isCompoundAssignment);
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DefId visitLValue(DfgScope* scope, AstExprIndexName* i, DefId incomingDef);
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DefId visitLValue(DfgScope* scope, AstExprIndexExpr* i, DefId incomingDef);
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DefId visitLValue(DfgScope* scope, AstExprError* e, DefId incomingDef);
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void visitType(DfgScope* scope, AstType* t);
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void visitType(DfgScope* scope, AstTypeReference* r);
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void visitType(DfgScope* scope, AstTypeTable* t);
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void visitType(DfgScope* scope, AstTypeFunction* f);
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void visitType(DfgScope* scope, AstTypeTypeof* t);
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void visitType(DfgScope* scope, AstTypeUnion* u);
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void visitType(DfgScope* scope, AstTypeIntersection* i);
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void visitType(DfgScope* scope, AstTypeError* error);
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void visitTypePack(DfgScope* scope, AstTypePack* p);
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void visitTypePack(DfgScope* scope, AstTypePackExplicit* e);
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void visitTypePack(DfgScope* scope, AstTypePackVariadic* v);
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void visitTypePack(DfgScope* scope, AstTypePackGeneric* g);
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void visitTypeList(DfgScope* scope, AstTypeList l);
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void visitGenerics(DfgScope* scope, AstArray<AstGenericType> g);
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void visitGenericPacks(DfgScope* scope, AstArray<AstGenericTypePack> g);
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};
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} // namespace Luau
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