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// Copyright 2021 The Dawn & Tint Authors
//
// 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.
//
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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#include "src/tint/lang/wgsl/sem/value_expression.h"
#include <utility>
#include "src/tint/lang/wgsl/sem/load.h"
#include "src/tint/lang/wgsl/sem/materialize.h"
#include "src/tint/utils/rtti/switch.h"
TINT_INSTANTIATE_TYPEINFO(tint::sem::ValueExpression);
namespace tint::sem {
ValueExpression::ValueExpression(const ast::Expression* declaration,
const core::type::Type* type,
core::EvaluationStage stage,
const Statement* statement,
const core::constant::Value* constant,
bool has_side_effects,
const Variable* root_ident /* = nullptr */)
: Base(declaration, statement),
root_identifier_(root_ident),
type_(type),
stage_(stage),
constant_(std::move(constant)),
has_side_effects_(has_side_effects) {
TINT_ASSERT(type_);
TINT_ASSERT((constant != nullptr) == (stage == core::EvaluationStage::kConstant));
if (constant != nullptr) {
TINT_ASSERT(type_ == constant->Type());
}
}
ValueExpression::~ValueExpression() = default;
const ValueExpression* ValueExpression::UnwrapMaterialize() const {
if (auto* m = As<Materialize>()) {
return m->Expr();
}
return this;
}
const ValueExpression* ValueExpression::UnwrapLoad() const {
if (auto* l = As<Load>()) {
return l->Source();
}
return this;
}
const ValueExpression* ValueExpression::Unwrap() const {
return Switch(
this, // note: An expression can only be wrapped by a Load or Materialize, not both.
[&](const Load* load) { return load->Source(); },
[&](const Materialize* materialize) { return materialize->Expr(); },
[&](Default) { return this; });
}
} // namespace tint::sem