src/tint/lang/core/ir/break_if.cc

// 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/break_if.h"

#include <utility>

#include "src/tint/lang/core/ir/block.h"
#include "src/tint/lang/core/ir/clone_context.h"
#include "src/tint/lang/core/ir/loop.h"
#include "src/tint/lang/core/ir/module.h"
#include "src/tint/lang/core/ir/multi_in_block.h"
#include "src/tint/utils/ice/ice.h"

TINT_INSTANTIATE_TYPEINFO(tint::core::ir::BreakIf);

namespace tint::core::ir {

BreakIf::BreakIf(Id id) : Base(id) {}

BreakIf::BreakIf(Id id,
                 Value* condition,
                 ir::Loop* loop,
                 VectorRef<Value*> next_iter_values /* = tint::Empty */,
                 VectorRef<Value*> exit_values /* = tint::Empty */)
    : Base(id), loop_(loop), num_next_iter_values_(next_iter_values.Length()) {
    TINT_ASSERT(loop_);

    AddOperand(BreakIf::kConditionOperandOffset, condition);
    AddOperands(BreakIf::kArgsOperandOffset, std::move(next_iter_values));
    AddOperands(BreakIf::kArgsOperandOffset + num_next_iter_values_, std::move(exit_values));

    if (loop_) {
        loop_->Body()->AddInboundSiblingBranch(this);
        SetControlInstruction(loop_);
    }
}

BreakIf::~BreakIf() = default;

BreakIf* BreakIf::Clone(CloneContext& ctx) {
    auto* loop = ctx.Remap(loop_);
    auto* cond = ctx.Remap(Condition());
    auto args = ctx.Remap<BreakIf::kDefaultNumOperands>(Args());
    return ctx.ir.CreateInstruction<BreakIf>(cond, loop, args);
}

void BreakIf::SetLoop(ir::Loop* loop) {
    if (loop_ && loop_->Body()) {
        loop_->Body()->RemoveInboundSiblingBranch(this);
    }
    loop_ = loop;
    SetControlInstruction(loop);
    if (loop) {
        loop->Body()->AddInboundSiblingBranch(this);
    }
}

}  // namespace tint::core::ir