mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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67 lines
2.4 KiB
C++
67 lines
2.4 KiB
C++
// Copyright (c) 2019 Google LLC
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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 "eliminate_dead_functions_util.h"
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namespace spvtools {
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namespace opt {
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namespace eliminatedeadfunctionsutil {
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Module::iterator EliminateFunction(IRContext* context,
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Module::iterator* func_iter) {
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bool first_func = *func_iter == context->module()->begin();
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bool seen_func_end = false;
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std::unordered_set<Instruction*> to_kill;
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(*func_iter)
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->ForEachInst(
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[context, first_func, func_iter, &seen_func_end,
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&to_kill](Instruction* inst) {
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if (inst->opcode() == SpvOpFunctionEnd) {
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seen_func_end = true;
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}
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// Move non-semantic instructions to the previous function or
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// global values if this is the first function.
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if (seen_func_end && inst->opcode() == SpvOpExtInst) {
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assert(inst->IsNonSemanticInstruction());
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if (to_kill.find(inst) != to_kill.end()) return;
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std::unique_ptr<Instruction> clone(inst->Clone(context));
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context->ForgetUses(inst);
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context->AnalyzeDefUse(clone.get());
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if (first_func) {
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context->AddGlobalValue(std::move(clone));
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} else {
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auto prev_func_iter = *func_iter;
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--prev_func_iter;
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prev_func_iter->AddNonSemanticInstruction(std::move(clone));
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}
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inst->ToNop();
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} else if (to_kill.find(inst) == to_kill.end()) {
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context->CollectNonSemanticTree(inst, &to_kill);
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context->KillInst(inst);
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}
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},
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true, true);
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for (auto* dead : to_kill) {
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context->KillInst(dead);
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}
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return func_iter->Erase();
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}
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} // namespace eliminatedeadfunctionsutil
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} // namespace opt
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} // namespace spvtools
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