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/*
* Copyright (C) 2022 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "ASTExpression.h"
#include "Types.h"
#include <wtf/OptionSet.h>
namespace WGSL {
class BoundsCheckVisitor;
class RewriteGlobalVariables;
class TypeChecker;
namespace AST {
// A CallExpression expresses a "function" call, which consists of a target to be called,
// and a list of arguments. The target does not necesserily have to be a function identifier,
// but can also be a type, in which the whole call is a type conversion expression. The exact
// kind of expression can only be resolved during semantic analysis.
class CallExpression final : public Expression {
WGSL_AST_BUILDER_NODE(CallExpression);
friend BoundsCheckVisitor;
friend RewriteGlobalVariables;
friend TypeChecker;
public:
using Ref = std::reference_wrapper<CallExpression>;
NodeKind kind() const override;
Expression& target() { return m_target.get(); }
Expression::List& arguments() { return m_arguments; }
bool isConstructor() const { return m_isConstructor; }
bool isFloatToIntConversion(const Type* result = nullptr) const
{
const auto& getPrimitiveType = [&](const Type* type) -> const Types::Primitive* {
if (auto* reference = std::get_if<Types::Reference>(type))
type = reference->element;
if (auto* vector = std::get_if<Types::Vector>(type))
type = vector->element;
return std::get_if<Types::Primitive>(type);
};
if (!m_isConstructor)
return false;
auto* resultPrimitive = getPrimitiveType(result ?: m_inferredType);
if (!resultPrimitive)
return false;
if (resultPrimitive->kind != Types::Primitive::I32 && resultPrimitive->kind != Types::Primitive::U32)
return false;
if (m_arguments.size() != 1)
return false;
auto& argument = m_arguments[0];
auto* argumentPrimitive = getPrimitiveType(argument.inferredType());
if (!argumentPrimitive)
return false;
if (argumentPrimitive->kind != Types::Primitive::F32 && argumentPrimitive->kind != Types::Primitive::F16 && argumentPrimitive->kind != Types::Primitive::AbstractFloat)
return false;
return true;
}
const OptionSet<ShaderStage>& visibility() const { return m_visibility; }
private:
CallExpression(SourceSpan span, Expression::Ref&& target, Expression::List&& arguments)
: Expression(span)
, m_target(WTFMove(target))
, m_arguments(WTFMove(arguments))
{ }
// If m_target is a NamedType, it could either be a:
// * Type that does not accept parameters (bool, i32, u32, ...)
// * Identifier that refers to a type alias.
// * Identifier that refers to a function.
Expression::Ref m_target;
Expression::List m_arguments;
bool m_isConstructor { false };
OptionSet<ShaderStage> m_visibility { ShaderStage::Compute, ShaderStage::Vertex, ShaderStage::Fragment };
};
} // namespace AST
} // namespace WGSL
SPECIALIZE_TYPE_TRAITS_WGSL_AST(CallExpression)
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