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/*
* Copyright 2022 Google LLC
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkSpan.h"
#include "include/core/SkTypes.h"
#include "include/private/SkSLIRNode.h"
#include "src/sksl/SkSLAnalysis.h"
#include "src/sksl/ir/SkSLConstructor.h"
#include "src/sksl/ir/SkSLExpression.h"
#include "src/sksl/ir/SkSLFieldAccess.h"
#include "src/sksl/ir/SkSLIndexExpression.h"
#include "src/sksl/ir/SkSLSwizzle.h"
#include "src/sksl/ir/SkSLType.h"
#include <memory>
namespace SkSL {
bool Analysis::IsTrivialExpression(const Expression& expr) {
switch (expr.kind()) {
case Expression::Kind::kLiteral:
case Expression::Kind::kVariableReference:
return true;
case Expression::Kind::kSwizzle:
// All swizzles are considered to be trivial.
return IsTrivialExpression(*expr.as<Swizzle>().base());
case Expression::Kind::kFieldAccess:
// Accessing a field is trivial.
return IsTrivialExpression(*expr.as<FieldAccess>().base());
case Expression::Kind::kIndex: {
// Accessing a constant array index is trivial.
const IndexExpression& inner = expr.as<IndexExpression>();
return inner.index()->isIntLiteral() && IsTrivialExpression(*inner.base());
}
case Expression::Kind::kConstructorArray:
case Expression::Kind::kConstructorStruct:
// Only consider small arrays/structs of compile-time-constants to be trivial.
return expr.type().slotCount() <= 4 && IsCompileTimeConstant(expr);
case Expression::Kind::kConstructorArrayCast:
case Expression::Kind::kConstructorMatrixResize:
// These operations require function calls in Metal, so they're never trivial.
return false;
case Expression::Kind::kConstructorCompound:
// Only compile-time-constant compound constructors are considered to be trivial.
return IsCompileTimeConstant(expr);
case Expression::Kind::kConstructorCompoundCast:
case Expression::Kind::kConstructorScalarCast:
case Expression::Kind::kConstructorSplat:
case Expression::Kind::kConstructorDiagonalMatrix: {
// Single-argument constructors are trivial when their inner expression is trivial.
SkASSERT(expr.asAnyConstructor().argumentSpan().size() == 1);
const Expression& inner = *expr.asAnyConstructor().argumentSpan().front();
return IsTrivialExpression(inner);
}
default:
return false;
}
}
} // namespace SkSL
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