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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
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 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.
#include "src/tint/lang/core/constant/value.h"
#include "src/tint/lang/core/constant/splat.h"
#include "src/tint/lang/core/type/array.h"
#include "src/tint/lang/core/type/matrix.h"
#include "src/tint/lang/core/type/struct.h"
#include "src/tint/lang/core/type/vector.h"
#include "src/tint/utils/rtti/switch.h"
TINT_INSTANTIATE_TYPEINFO(tint::core::constant::Value);
namespace tint::core::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 (this == b) {
return true;
}
if (Hash() != b->Hash()) {
return false;
}
if (Type() != b->Type()) {
return false;
}
auto elements_equal = [&](size_t count) {
if (count == 0) {
return true;
}
// Avoid per-element comparisons if the constants are splats
bool a_is_splat = Is<Splat>();
bool b_is_splat = b->Is<Splat>();
if (a_is_splat && b_is_splat) {
return Index(0)->Equal(b->Index(0));
}
if (a_is_splat) {
auto* el_a = Index(0);
for (size_t i = 0; i < count; i++) {
if (!el_a->Equal(b->Index(i))) {
return false;
}
}
return true;
}
if (b_is_splat) {
auto* el_b = b->Index(0);
for (size_t i = 0; i < count; i++) {
if (!Index(i)->Equal(el_b)) {
return false;
}
}
return true;
}
// Per-element comparison
for (size_t i = 0; i < count; i++) {
if (!Index(i)->Equal(b->Index(i))) {
return false;
}
}
return true;
};
return Switch(
Type(), //
[&](const core::type::Vector* vec) { return elements_equal(vec->Width()); },
[&](const core::type::Matrix* mat) { return elements_equal(mat->columns()); },
[&](const core::type::Struct* str) { return elements_equal(str->Members().Length()); },
[&](const core::type::Array* arr) {
if (auto n = arr->ConstantCount()) {
return elements_equal(*n);
}
return false;
},
[&](Default) {
auto va = InternalValue();
auto vb = b->InternalValue();
TINT_ASSERT(!std::holds_alternative<std::monostate>(va));
TINT_ASSERT(!std::holds_alternative<std::monostate>(vb));
return va == vb;
});
}
} // namespace tint::core::constant