SkSL performance improvements

src/sksl/SkSLIRGenerator.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
  
 #ifndef SKSL_IRGENERATOR
 #define SKSL_IRGENERATOR
 
@@ skipping 44 matching lines @@
 public:
     IRGenerator(std::shared_ptr<SymbolTable> root, ErrorReporter& errorReporter);
 
     std::unique_ptr<VarDeclaration> convertVarDeclaration(const ASTVarDeclaration& decl, 
                                                           Variable::Storage storage);
     std::unique_ptr<FunctionDefinition> convertFunction(const ASTFunction& f);
     std::unique_ptr<Statement> convertStatement(const ASTStatement& statement);
     std::unique_ptr<Expression> convertExpression(const ASTExpression& expression);
 
 private:
-    void pushSymbolTable();
+    void pushSymbolTable(bool owner = false);
     void popSymbolTable();
 
-    std::shared_ptr<Type> convertType(const ASTType& type);
+    const Type* convertType(const ASTType& type);
     std::unique_ptr<Expression> call(Position position, 
-                                     std::shared_ptr<FunctionDeclaration> function, 
+                                     const FunctionDeclaration& function, 
                                      std::vector<std::unique_ptr<Expression>> arguments);
-    bool determineCallCost(std::shared_ptr<FunctionDeclaration> function, 
+    bool determineCallCost(const FunctionDeclaration& function, 
                            const std::vector<std::unique_ptr<Expression>>& arguments,
                            int* outCost);
     std::unique_ptr<Expression> call(Position position, std::unique_ptr<Expression> function, 
                                      std::vector<std::unique_ptr<Expression>> arguments);
-    std::unique_ptr<Expression> coerce(std::unique_ptr<Expression> expr, 
-                                       std::shared_ptr<Type> type);
+    std::unique_ptr<Expression> coerce(std::unique_ptr<Expression> expr, const Type& type);
     std::unique_ptr<Block> convertBlock(const ASTBlock& block);
     std::unique_ptr<Statement> convertBreak(const ASTBreakStatement& b);
     std::unique_ptr<Expression> convertConstructor(Position position, 
-                                                   std::shared_ptr<Type> type, 
+                                                   const Type& type, 
                                                    std::vector<std::unique_ptr<Expression>> params);
     std::unique_ptr<Statement> convertContinue(const ASTContinueStatement& c);
     std::unique_ptr<Statement> convertDiscard(const ASTDiscardStatement& d);
     std::unique_ptr<Statement> convertDo(const ASTDoStatement& d);
     std::unique_ptr<Expression> convertBinaryExpression(const ASTBinaryExpression& expression);
     std::unique_ptr<Extension> convertExtension(const ASTExtension& e);
     std::unique_ptr<Statement> convertExpressionStatement(const ASTExpressionStatement& s);
     std::unique_ptr<Statement> convertFor(const ASTForStatement& f);
     std::unique_ptr<Expression> convertIdentifier(const ASTIdentifier& identifier);
     std::unique_ptr<Statement> convertIf(const ASTIfStatement& s);
     std::unique_ptr<Expression> convertIndex(std::unique_ptr<Expression> base,
                                              const ASTExpression& index);
     std::unique_ptr<InterfaceBlock> convertInterfaceBlock(const ASTInterfaceBlock& s);
     Modifiers convertModifiers(const ASTModifiers& m);
     std::unique_ptr<Expression> convertPrefixExpression(const ASTPrefixExpression& expression);
     std::unique_ptr<Statement> convertReturn(const ASTReturnStatement& r);
     std::unique_ptr<Expression> convertSuffixExpression(const ASTSuffixExpression& expression);
     std::unique_ptr<Expression> convertField(std::unique_ptr<Expression> base, 
                                              const std::string& field);
     std::unique_ptr<Expression> convertSwizzle(std::unique_ptr<Expression> base,
                                                const std::string& fields);
     std::unique_ptr<Expression> convertTernaryExpression(const ASTTernaryExpression& expression);
     std::unique_ptr<Statement> convertVarDeclarationStatement(const ASTVarDeclarationStatement& s);
     std::unique_ptr<Statement> convertWhile(const ASTWhileStatement& w);
 
     void checkValid(const Expression& expr);
-    void markReadFrom(std::shared_ptr<Variable> var);
+    void markReadFrom(const Variable& var);
     void markWrittenTo(const Expression& expr);
 
-    std::shared_ptr<FunctionDeclaration> fCurrentFunction;
+    const FunctionDeclaration* fCurrentFunction;
     std::shared_ptr<SymbolTable> fSymbolTable;
     ErrorReporter& fErrors;
 
     friend class AutoSymbolTable;
     friend class Compiler;
 };
 
 }
 
 #endif