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https://github.com/KhronosGroup/SPIRV-Tools
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5834719fc1
There does not seem to be any pass that remove global variables. I think we could use one. This pass will look specifically for global variables that are not referenced and are not exported. Any decoration associated with the variable will also be removed. However, this could cause types or constants to become unreferenced. They will not be removed. Another pass will have to be called to remove those.
84 lines
3.5 KiB
C++
84 lines
3.5 KiB
C++
// Copyright (c) 2017 Pierre Moreau
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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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#ifndef LIBSPIRV_OPT_DECORATION_MANAGER_H_
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#define LIBSPIRV_OPT_DECORATION_MANAGER_H_
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#include <functional>
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#include <unordered_map>
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#include <vector>
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#include "instruction.h"
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#include "module.h"
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namespace spvtools {
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namespace opt {
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namespace analysis {
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// A class for analyzing and managing decorations in an ir::Module.
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class DecorationManager {
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public:
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// Constructs a decoration manager from the given |module|
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DecorationManager(ir::Module* module) { AnalyzeDecorations(module); }
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// Removes all decorations from |id|, which should not be a group ID, except
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// for linkage decorations if |keep_linkage| is set.
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void RemoveDecorationsFrom(uint32_t id, bool keep_linkage);
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// Returns a vector of all decorations affecting |id|. If a group is applied
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// to |id|, the decorations of that group are returned rather than the group
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// decoration instruction. If |include_linkage| is not set, linkage
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// decorations won't be returned.
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std::vector<ir::Instruction*> GetDecorationsFor(uint32_t id,
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bool include_linkage);
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std::vector<const ir::Instruction*> GetDecorationsFor(
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uint32_t id, bool include_linkage) const;
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// Returns whether two IDs have the same decorations. Two SpvOpGroupDecorate
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// instructions that apply the same decorations but to different IDs, still
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// count as being the same.
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bool HaveTheSameDecorations(uint32_t id1, uint32_t id2) const;
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// Returns whether two decorations are the same. SpvOpDecorateId is currently
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// not handled and will return false no matter what.
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bool AreDecorationsTheSame(const ir::Instruction* inst1,
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const ir::Instruction* inst2) const;
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// |f| is run on each decoration instruction for |id| with decoration
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// |decoration|.
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void ForEachDecoration(uint32_t id, uint32_t decoration,
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std::function<void(const ir::Instruction& f)>) const;
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private:
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using IdToDecorationInstsMap =
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std::unordered_map<uint32_t, std::vector<ir::Instruction*>>;
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// Analyzes the defs and uses in the given |module| and populates data
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// structures in this class. Does nothing if |module| is nullptr.
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void AnalyzeDecorations(ir::Module* module);
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template <typename T>
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std::vector<T> InternalGetDecorationsFor(uint32_t id, bool include_linkage);
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// Mapping from ids to the instructions applying a decoration to them. In
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// other words, for each id you get all decoration instructions referencing
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// that id, be it directly (SpvOpDecorate, SpvOpMemberDecorate and
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// SpvOpDecorateId), or indirectly (SpvOpGroupDecorate,
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// SpvOpMemberGroupDecorate).
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IdToDecorationInstsMap id_to_decoration_insts_;
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// Mapping from group ids to all the decoration instructions they apply.
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IdToDecorationInstsMap group_to_decoration_insts_;
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};
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} // namespace analysis
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} // namespace opt
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} // namespace spvtools
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#endif // LIBSPIRV_OPT_DECORATION_MANAGER_H_
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