153 lines
3.3 KiB
C++
153 lines
3.3 KiB
C++
/*
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* Copyright 2016-2019 Arm Limited
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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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*/
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#ifndef SPIRV_CROSS_CFG_HPP
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#define SPIRV_CROSS_CFG_HPP
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#include "spirv_common.hpp"
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#include <assert.h>
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namespace SPIRV_CROSS_NAMESPACE
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{
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class Compiler;
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class CFG
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{
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public:
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CFG(Compiler &compiler, const SPIRFunction &function);
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Compiler &get_compiler()
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{
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return compiler;
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}
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const Compiler &get_compiler() const
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{
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return compiler;
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}
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const SPIRFunction &get_function() const
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{
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return func;
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}
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uint32_t get_immediate_dominator(uint32_t block) const
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{
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auto itr = immediate_dominators.find(block);
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if (itr != std::end(immediate_dominators))
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return itr->second;
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else
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return 0;
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}
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uint32_t get_visit_order(uint32_t block) const
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{
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auto itr = visit_order.find(block);
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assert(itr != std::end(visit_order));
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int v = itr->second.get();
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assert(v > 0);
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return uint32_t(v);
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}
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uint32_t find_common_dominator(uint32_t a, uint32_t b) const;
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const SmallVector<uint32_t> &get_preceding_edges(uint32_t block) const
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{
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auto itr = preceding_edges.find(block);
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if (itr != std::end(preceding_edges))
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return itr->second;
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else
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return empty_vector;
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}
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const SmallVector<uint32_t> &get_succeeding_edges(uint32_t block) const
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{
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auto itr = succeeding_edges.find(block);
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if (itr != std::end(succeeding_edges))
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return itr->second;
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else
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return empty_vector;
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}
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template <typename Op>
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void walk_from(std::unordered_set<uint32_t> &seen_blocks, uint32_t block, const Op &op) const
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{
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if (seen_blocks.count(block))
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return;
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seen_blocks.insert(block);
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op(block);
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for (auto b : get_succeeding_edges(block))
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walk_from(seen_blocks, b, op);
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}
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uint32_t find_loop_dominator(uint32_t block) const;
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private:
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struct VisitOrder
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{
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int &get()
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{
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return v;
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}
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const int &get() const
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{
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return v;
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}
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int v = -1;
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};
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Compiler &compiler;
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const SPIRFunction &func;
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std::unordered_map<uint32_t, SmallVector<uint32_t>> preceding_edges;
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std::unordered_map<uint32_t, SmallVector<uint32_t>> succeeding_edges;
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std::unordered_map<uint32_t, uint32_t> immediate_dominators;
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std::unordered_map<uint32_t, VisitOrder> visit_order;
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SmallVector<uint32_t> post_order;
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SmallVector<uint32_t> empty_vector;
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void add_branch(uint32_t from, uint32_t to);
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void build_post_order_visit_order();
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void build_immediate_dominators();
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bool post_order_visit(uint32_t block);
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uint32_t visit_count = 0;
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bool is_back_edge(uint32_t to) const;
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bool has_visited_forward_edge(uint32_t to) const;
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};
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class DominatorBuilder
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{
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public:
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DominatorBuilder(const CFG &cfg);
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void add_block(uint32_t block);
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uint32_t get_dominator() const
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{
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return dominator;
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}
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void lift_continue_block_dominator();
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private:
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const CFG &cfg;
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uint32_t dominator = 0;
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};
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} // namespace SPIRV_CROSS_NAMESPACE
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#endif
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