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// Copyright 2023 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/ir/var.h"
#include "src/tint/lang/core/ir/clone_context.h"
#include "src/tint/lang/core/ir/module.h"
#include "src/tint/lang/core/ir/store.h"
#include "src/tint/lang/core/type/pointer.h"
#include "src/tint/utils/ice/ice.h"
TINT_INSTANTIATE_TYPEINFO(tint::core::ir::Var);
namespace tint::core::ir {
Var::Var() = default;
Var::Var(InstructionResult* result) {
if (result && result->Type()) {
TINT_ASSERT(result->Type()->Is<core::type::Pointer>());
}
// Default to no initializer.
AddOperand(Var::kInitializerOperandOffset, nullptr);
AddResult(result);
}
Var::~Var() = default;
Var* Var::Clone(CloneContext& ctx) {
auto* new_result = ctx.Clone(Result(0));
auto* new_var = ctx.ir.instructions.Create<Var>(new_result);
new_var->binding_point_ = binding_point_;
new_var->attributes_ = attributes_;
if (auto* init = Initializer()) {
new_var->SetInitializer(ctx.Clone(init));
}
auto name = ctx.ir.NameOf(this);
if (name.IsValid()) {
ctx.ir.SetName(new_var, name.Name());
}
return new_var;
}
void Var::SetInitializer(Value* initializer) {
SetOperand(Var::kInitializerOperandOffset, initializer);
}
void Var::DestroyIfOnlyAssigned() {
auto* result = Result(0);
if (result->Usages().All([](const Usage& u) { return u.instruction->Is<ir::Store>(); })) {
while (!result->Usages().IsEmpty()) {
auto& usage = *result->Usages().begin();
usage->instruction->Destroy();
}
Destroy();
}
}
} // namespace tint::core::ir