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// Copyright 2021 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0(the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "src/tint/constant/value.h"
#include "src/tint/switch.h"
#include "src/tint/type/array.h"
#include "src/tint/type/matrix.h"
#include "src/tint/type/struct.h"
#include "src/tint/type/vector.h"
TINT_INSTANTIATE_TYPEINFO(tint::constant::Value);
namespace tint::constant {
Value::Value() = default;
Value::~Value() = default;
/// Equal returns true if the constants `a` and `b` are of the same type and value.
bool Value::Equal(const constant::Value* b) const {
if (Hash() != b->Hash()) {
return false;
}
if (Type() != b->Type()) {
return false;
}
return Switch(
Type(), //
[&](const type::Vector* vec) {
for (size_t i = 0; i < vec->Width(); i++) {
if (!Index(i)->Equal(b->Index(i))) {
return false;
}
}
return true;
},
[&](const type::Matrix* mat) {
for (size_t i = 0; i < mat->columns(); i++) {
if (!Index(i)->Equal(b->Index(i))) {
return false;
}
}
return true;
},
[&](const type::Array* arr) {
if (auto count = arr->ConstantCount()) {
for (size_t i = 0; i < count; i++) {
if (!Index(i)->Equal(b->Index(i))) {
return false;
}
}
return true;
}
return false;
},
[&](const type::Struct* str) {
auto count = str->Members().Length();
for (size_t i = 0; i < count; i++) {
if (!Index(i)->Equal(b->Index(i))) {
return false;
}
}
return true;
},
[&](Default) {
auto va = InternalValue();
auto vb = b->InternalValue();
TINT_ASSERT(Resolver, !std::holds_alternative<std::monostate>(va));
TINT_ASSERT(Resolver, !std::holds_alternative<std::monostate>(vb));
return va == vb;
});
}
} // namespace tint::constant