SkSL performance improvements

src/sksl/SkSLSPIRVCodeGenerator.h

Index: src/sksl/SkSLSPIRVCodeGenerator.h
diff --git a/src/sksl/SkSLSPIRVCodeGenerator.h b/src/sksl/SkSLSPIRVCodeGenerator.h
index 885c6b8b706bc1ea6043b2d41af122d2113f9bcf..a20ad9f40b976fd693229936f34628a83e146142 100644
--- a/src/sksl/SkSLSPIRVCodeGenerator.h
+++ b/src/sksl/SkSLSPIRVCodeGenerator.h
@@ -61,8 +61,9 @@ public:
         virtual void store(SpvId value, std::ostream& out) = 0;
     };
 
-    SPIRVCodeGenerator()
-    : fCapabilities(1 << SpvCapabilityShader)
+    SPIRVCodeGenerator(const Context* context)
+    : fContext(*context)
+    , fCapabilities(1 << SpvCapabilityShader)
     , fIdCount(1)
     , fBoolTrue(0)
     , fBoolFalse(0)
@@ -92,9 +93,9 @@ private:
 
     SpvId getType(const Type& type);
 
-    SpvId getFunctionType(std::shared_ptr<FunctionDeclaration> function);
+    SpvId getFunctionType(const FunctionDeclaration& function);
 
-    SpvId getPointerType(std::shared_ptr<Type> type, SpvStorageClass_ storageClass);
+    SpvId getPointerType(const Type& type, SpvStorageClass_ storageClass);
 
     std::vector<SpvId> getAccessChain(Expression& expr, std::ostream& out);
 
@@ -108,11 +109,11 @@ private:
 
     SpvId writeInterfaceBlock(InterfaceBlock& intf);
 
-    SpvId writeFunctionStart(std::shared_ptr<FunctionDeclaration> f, std::ostream& out);
+    SpvId writeFunctionStart(const FunctionDeclaration& f, std::ostream& out);
     
-    SpvId writeFunctionDeclaration(std::shared_ptr<FunctionDeclaration> f, std::ostream& out);
+    SpvId writeFunctionDeclaration(const FunctionDeclaration& f, std::ostream& out);
 
-    SpvId writeFunction(FunctionDefinition& f, std::ostream& out);
+    SpvId writeFunction(const FunctionDefinition& f, std::ostream& out);
 
     void writeGlobalVars(VarDeclaration& v, std::ostream& out);
 
@@ -227,14 +228,16 @@ private:
                           int32_t word5, int32_t word6, int32_t word7, int32_t word8, 
                           std::ostream& out);
 
+    const Context& fContext;
+
     uint64_t fCapabilities;
     SpvId fIdCount;
     SpvId fGLSLExtendedInstructions;
     typedef std::tuple<IntrinsicKind, int32_t, int32_t, int32_t, int32_t> Intrinsic;
     std::unordered_map<std::string, Intrinsic> fIntrinsicMap;
-    std::unordered_map<std::shared_ptr<FunctionDeclaration>, SpvId> fFunctionMap;
-    std::unordered_map<std::shared_ptr<Variable>, SpvId> fVariableMap;
-    std::unordered_map<std::shared_ptr<Variable>, int32_t> fInterfaceBlockMap;
+    std::unordered_map<const FunctionDeclaration*, SpvId> fFunctionMap;
+    std::unordered_map<const Variable*, SpvId> fVariableMap;
+    std::unordered_map<const Variable*, int32_t> fInterfaceBlockMap;
     std::unordered_map<std::string, SpvId> fTypeMap;
     std::stringstream fCapabilitiesBuffer;
     std::stringstream fGlobalInitializersBuffer;