1 /* 2 * Copyright 2021 Google LLC 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SKSL_CONSTRUCTOR_SCALAR_CAST 9 #define SKSL_CONSTRUCTOR_SCALAR_CAST 10 11 #include "include/private/SkSLDefines.h" 12 #include "src/sksl/SkSLContext.h" 13 #include "src/sksl/ir/SkSLConstructor.h" 14 #include "src/sksl/ir/SkSLExpression.h" 15 16 #include <memory> 17 18 namespace SkSL { 19 20 /** 21 * Represents the construction of a scalar cast, such as `float(intVariable)`. 22 * 23 * These always contain exactly 1 scalar of a differing type, and are never constant. 24 */ 25 class ConstructorScalarCast final : public SingleArgumentConstructor { 26 public: 27 inline static constexpr Kind kExpressionKind = Kind::kConstructorScalarCast; 28 ConstructorScalarCast(int line,const Type & type,std::unique_ptr<Expression> arg)29 ConstructorScalarCast(int line, const Type& type, std::unique_ptr<Expression> arg) 30 : INHERITED(line, kExpressionKind, &type, std::move(arg)) {} 31 32 // ConstructorScalarCast::Convert will typecheck and create scalar-constructor expressions. 33 // Reports errors via the ErrorReporter; returns null on error. 34 static std::unique_ptr<Expression> Convert(const Context& context, 35 int line, 36 const Type& rawType, 37 ExpressionArray args); 38 39 // ConstructorScalarCast::Make casts a scalar expression. Casts that can be evaluated at 40 // compile-time will do so (e.g. `int(4.1)` --> `Literal(int 4)`). Errors reported via SkASSERT. 41 static std::unique_ptr<Expression> Make(const Context& context, 42 int line, 43 const Type& type, 44 std::unique_ptr<Expression> arg); 45 clone()46 std::unique_ptr<Expression> clone() const override { 47 return std::make_unique<ConstructorScalarCast>(fLine, this->type(), argument()->clone()); 48 } 49 isCompileTimeConstant()50 bool isCompileTimeConstant() const override { 51 // If this were a compile-time constant, we would have created a literal instead. 52 return false; 53 } 54 55 private: 56 using INHERITED = SingleArgumentConstructor; 57 }; 58 59 } // namespace SkSL 60 61 #endif 62