added initial GLSL support to skslc

src/sksl/SkSLSPIRVCodeGenerator.h

Index: src/sksl/SkSLSPIRVCodeGenerator.h
diff --git a/src/sksl/SkSLSPIRVCodeGenerator.h b/src/sksl/SkSLSPIRVCodeGenerator.h
index a20ad9f40b976fd693229936f34628a83e146142..caae20114d31f3e264339bfafa2b6ee78bfccafd 100644
--- a/src/sksl/SkSLSPIRVCodeGenerator.h
+++ b/src/sksl/SkSLSPIRVCodeGenerator.h
@@ -71,7 +71,7 @@ public:
         this->setupIntrinsics();
     }
 
-    void generateCode(Program& program, std::ostream& out) override;
+    void generateCode(const Program& program, std::ostream& out) override;
 
 private:
     enum IntrinsicKind {
@@ -97,7 +97,7 @@ private:
 
     SpvId getPointerType(const Type& type, SpvStorageClass_ storageClass);
 
-    std::vector<SpvId> getAccessChain(Expression& expr, std::ostream& out);
+    std::vector<SpvId> getAccessChain(const Expression& expr, std::ostream& out);
 
     void writeLayout(const Layout& layout, SpvId target);
 
@@ -105,9 +105,9 @@ private:
 
     void writeStruct(const Type& type, SpvId resultId);
 
-    void writeProgramElement(ProgramElement& pe, std::ostream& out);
+    void writeProgramElement(const ProgramElement& pe, std::ostream& out);
 
-    SpvId writeInterfaceBlock(InterfaceBlock& intf);
+    SpvId writeInterfaceBlock(const InterfaceBlock& intf);
 
     SpvId writeFunctionStart(const FunctionDeclaration& f, std::ostream& out);
     
@@ -115,78 +115,78 @@ private:
 
     SpvId writeFunction(const FunctionDefinition& f, std::ostream& out);
 
-    void writeGlobalVars(VarDeclaration& v, std::ostream& out);
+    void writeGlobalVars(const VarDeclaration& v, std::ostream& out);
 
-    void writeVarDeclaration(VarDeclaration& decl, std::ostream& out);
+    void writeVarDeclaration(const VarDeclaration& decl, std::ostream& out);
 
-    SpvId writeVariableReference(VariableReference& ref, std::ostream& out);
+    SpvId writeVariableReference(const VariableReference& ref, std::ostream& out);
 
-    std::unique_ptr<LValue> getLValue(Expression& value, std::ostream& out);
+    std::unique_ptr<LValue> getLValue(const Expression& value, std::ostream& out);
 
-    SpvId writeExpression(Expression& expr, std::ostream& out);
+    SpvId writeExpression(const Expression& expr, std::ostream& out);
     
-    SpvId writeIntrinsicCall(FunctionCall& c, std::ostream& out);
+    SpvId writeIntrinsicCall(const FunctionCall& c, std::ostream& out);
 
-    SpvId writeFunctionCall(FunctionCall& c, std::ostream& out);
+    SpvId writeFunctionCall(const FunctionCall& c, std::ostream& out);
 
-    SpvId writeSpecialIntrinsic(FunctionCall& c, SpecialIntrinsic kind, std::ostream& out);
+    SpvId writeSpecialIntrinsic(const FunctionCall& c, SpecialIntrinsic kind, std::ostream& out);
 
-    SpvId writeConstantVector(Constructor& c);
+    SpvId writeConstantVector(const Constructor& c);
 
-    SpvId writeFloatConstructor(Constructor& c, std::ostream& out);
+    SpvId writeFloatConstructor(const Constructor& c, std::ostream& out);
 
-    SpvId writeIntConstructor(Constructor& c, std::ostream& out);
+    SpvId writeIntConstructor(const Constructor& c, std::ostream& out);
     
-    SpvId writeMatrixConstructor(Constructor& c, std::ostream& out);
+    SpvId writeMatrixConstructor(const Constructor& c, std::ostream& out);
 
-    SpvId writeVectorConstructor(Constructor& c, std::ostream& out);
+    SpvId writeVectorConstructor(const Constructor& c, std::ostream& out);
 
-    SpvId writeConstructor(Constructor& c, std::ostream& out);
+    SpvId writeConstructor(const Constructor& c, std::ostream& out);
 
-    SpvId writeFieldAccess(FieldAccess& f, std::ostream& out);
+    SpvId writeFieldAccess(const FieldAccess& f, std::ostream& out);
 
-    SpvId writeSwizzle(Swizzle& swizzle, std::ostream& out);
+    SpvId writeSwizzle(const Swizzle& swizzle, std::ostream& out);
 
     SpvId writeBinaryOperation(const Type& resultType, const Type& operandType, SpvId lhs, 
                                SpvId rhs, SpvOp_ ifFloat, SpvOp_ ifInt, SpvOp_ ifUInt, 
                                SpvOp_ ifBool, std::ostream& out);
 
-    SpvId writeBinaryOperation(BinaryExpression& expr, SpvOp_ ifFloat, SpvOp_ ifInt, SpvOp_ ifUInt,
-                               std::ostream& out);
+    SpvId writeBinaryOperation(const BinaryExpression& expr, SpvOp_ ifFloat, SpvOp_ ifInt, 
+                               SpvOp_ ifUInt, std::ostream& out);
 
-    SpvId writeBinaryExpression(BinaryExpression& b, std::ostream& out);
+    SpvId writeBinaryExpression(const BinaryExpression& b, std::ostream& out);
 
-    SpvId writeTernaryExpression(TernaryExpression& t, std::ostream& out);
+    SpvId writeTernaryExpression(const TernaryExpression& t, std::ostream& out);
 
-    SpvId writeIndexExpression(IndexExpression& expr, std::ostream& out);
+    SpvId writeIndexExpression(const IndexExpression& expr, std::ostream& out);
 
-    SpvId writeLogicalAnd(BinaryExpression& b, std::ostream& out);
+    SpvId writeLogicalAnd(const BinaryExpression& b, std::ostream& out);
 
-    SpvId writeLogicalOr(BinaryExpression& o, std::ostream& out);
+    SpvId writeLogicalOr(const BinaryExpression& o, std::ostream& out);
 
-    SpvId writePrefixExpression(PrefixExpression& p, std::ostream& out);
+    SpvId writePrefixExpression(const PrefixExpression& p, std::ostream& out);
 
-    SpvId writePostfixExpression(PostfixExpression& p, std::ostream& out);
+    SpvId writePostfixExpression(const PostfixExpression& p, std::ostream& out);
 
-    SpvId writeBoolLiteral(BoolLiteral& b);
+    SpvId writeBoolLiteral(const BoolLiteral& b);
 
-    SpvId writeIntLiteral(IntLiteral& i);
+    SpvId writeIntLiteral(const IntLiteral& i);
 
-    SpvId writeFloatLiteral(FloatLiteral& f);
+    SpvId writeFloatLiteral(const FloatLiteral& f);
 
-    void writeStatement(Statement& s, std::ostream& out);
+    void writeStatement(const Statement& s, std::ostream& out);
 
-    void writeBlock(Block& b, std::ostream& out);
+    void writeBlock(const Block& b, std::ostream& out);
 
-    void writeIfStatement(IfStatement& stmt, std::ostream& out);
+    void writeIfStatement(const IfStatement& stmt, std::ostream& out);
 
-    void writeForStatement(ForStatement& f, std::ostream& out);
+    void writeForStatement(const ForStatement& f, std::ostream& out);
 
-    void writeReturnStatement(ReturnStatement& r, std::ostream& out);
+    void writeReturnStatement(const ReturnStatement& r, std::ostream& out);
 
     void writeCapabilities(std::ostream& out);
 
-    void writeInstructions(Program& program, std::ostream& out);
+    void writeInstructions(const Program& program, std::ostream& out);
 
     void writeOpCode(SpvOp_ opCode, int length, std::ostream& out);