SkSL performance improvements

src/sksl/ir/SkSLSymbolTable.h

Index: src/sksl/ir/SkSLSymbolTable.h
diff --git a/src/sksl/ir/SkSLSymbolTable.h b/src/sksl/ir/SkSLSymbolTable.h
index 151475d6423690d3024d322c2c3968f0a21a9066..d732023ff091e01344f170221a64b0cc1cf91213 100644
--- a/src/sksl/ir/SkSLSymbolTable.h
+++ b/src/sksl/ir/SkSLSymbolTable.h
@@ -10,12 +10,14 @@
 
 #include <memory>
 #include <unordered_map>
+#include <vector>
 #include "SkSLErrorReporter.h"
 #include "SkSLSymbol.h"
-#include "SkSLUnresolvedFunction.h"
 
 namespace SkSL {
 
+struct FunctionDeclaration;
+
 /**
  * Maps identifiers to symbols. Functions, in particular, are mapped to either FunctionDeclaration
  * or UnresolvedFunction depending on whether they are overloaded or not.
@@ -29,17 +31,22 @@ public:
     : fParent(parent)
     , fErrorReporter(errorReporter) {}
 
-    std::shared_ptr<Symbol> operator[](const std::string& name);
+    const Symbol* operator[](const std::string& name);
+
+    void add(const std::string& name, std::unique_ptr<Symbol> symbol);
 
-    void add(const std::string& name, std::shared_ptr<Symbol> symbol);
+    void addWithoutOwnership(const std::string& name, const Symbol* symbol);
+
+    Symbol* takeOwnership(Symbol* s);
 
     const std::shared_ptr<SymbolTable> fParent;
 
 private:
-    static std::vector<std::shared_ptr<FunctionDeclaration>> GetFunctions(
-                                                                  const std::shared_ptr<Symbol>& s);
+    static std::vector<const FunctionDeclaration*> GetFunctions(const Symbol& s);
+
+    std::vector<std::unique_ptr<Symbol>> fOwnedPointers;
 
-    std::unordered_map<std::string, std::shared_ptr<Symbol>> fSymbols;
+    std::unordered_map<std::string, const Symbol*> fSymbols;
 
     ErrorReporter& fErrorReporter;
 };