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https://github.com/KhronosGroup/SPIRV-Tools
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d35a78db57
Fixes #4960 * Switches to using enum classes with an underlying type to avoid undefined behaviour
95 lines
3.3 KiB
C++
95 lines
3.3 KiB
C++
// Copyright (c) 2021 ZHOU He
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "remove_unused_interface_variables_pass.h"
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#include "source/spirv_constant.h"
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namespace spvtools {
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namespace opt {
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class RemoveUnusedInterfaceVariablesContext {
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RemoveUnusedInterfaceVariablesPass& parent_;
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Instruction& entry_;
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std::unordered_set<uint32_t> used_variables_;
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IRContext::ProcessFunction pfn_ =
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std::bind(&RemoveUnusedInterfaceVariablesContext::processFunction, this,
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std::placeholders::_1);
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bool processFunction(Function* func) {
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for (const auto& basic_block : *func)
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for (const auto& instruction : basic_block)
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instruction.ForEachInId([&](const uint32_t* id) {
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if (used_variables_.count(*id)) return;
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auto* var = parent_.get_def_use_mgr()->GetDef(*id);
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if (!var || var->opcode() != spv::Op::OpVariable) return;
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auto storage_class =
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spv::StorageClass(var->GetSingleWordInOperand(0));
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if (storage_class != spv::StorageClass::Function &&
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(parent_.get_module()->version() >=
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SPV_SPIRV_VERSION_WORD(1, 4) ||
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storage_class == spv::StorageClass::Input ||
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storage_class == spv::StorageClass::Output))
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used_variables_.insert(*id);
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});
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return false;
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}
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public:
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RemoveUnusedInterfaceVariablesContext(
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RemoveUnusedInterfaceVariablesPass& parent, Instruction& entry)
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: parent_(parent), entry_(entry) {}
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void CollectUsedVariables() {
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std::queue<uint32_t> roots;
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roots.push(entry_.GetSingleWordInOperand(1));
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parent_.context()->ProcessCallTreeFromRoots(pfn_, &roots);
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}
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bool ShouldModify() {
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std::unordered_set<uint32_t> old_variables;
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for (int i = entry_.NumInOperands() - 1; i >= 3; --i) {
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auto variable = entry_.GetInOperand(i).words[0];
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if (!used_variables_.count(variable)) return true; // It is unused.
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if (old_variables.count(variable)) return true; // It is duplicate.
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old_variables.insert(variable);
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}
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if (old_variables.size() != used_variables_.size()) // Missing IDs.
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return true;
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return false;
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}
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void Modify() {
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for (int i = entry_.NumInOperands() - 1; i >= 3; --i)
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entry_.RemoveInOperand(i);
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for (auto id : used_variables_) {
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entry_.AddOperand(Operand(SPV_OPERAND_TYPE_ID, {id}));
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}
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}
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};
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RemoveUnusedInterfaceVariablesPass::Status
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RemoveUnusedInterfaceVariablesPass::Process() {
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bool modified = false;
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for (auto& entry : get_module()->entry_points()) {
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RemoveUnusedInterfaceVariablesContext context(*this, entry);
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context.CollectUsedVariables();
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if (context.ShouldModify()) {
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context.Modify();
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modified = true;
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}
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}
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return (modified ? Status::SuccessWithChange : Status::SuccessWithoutChange);
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}
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} // namespace opt
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} // namespace spvtools
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