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86e45efe15
There are a couple spots where we are not looking at decorations when we should. 1. Value numbering is suppose to assign a different value number to ids if they have different decorations. However that is not being done for OpCopyObject and OpPhi. 1. Instruction simplification is propagating OpCopyObject instruction without checking for decorations. It should only do that if no decorations are being lost. Add a new function to the decoration manager to check if the decorations of one id are a subset of the decorations of another. Fixes #2715.
199 lines
8.7 KiB
C++
199 lines
8.7 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 SOURCE_OPT_DECORATION_MANAGER_H_
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#define SOURCE_OPT_DECORATION_MANAGER_H_
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#include <functional>
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#include <unordered_map>
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#include <unordered_set>
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#include <vector>
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#include "source/opt/instruction.h"
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#include "source/opt/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 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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explicit DecorationManager(Module* module) : module_(module) {
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AnalyzeDecorations();
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}
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DecorationManager() = delete;
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// Changes all of the decorations (direct and through groups) where |pred| is
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// true and that apply to |id| so that they no longer apply to |id|.
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//
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// If |id| is part of a group, it will be removed from the group if it
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// does not use all of the group's decorations, or, if there are no
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// decorations that apply to the group.
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//
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// If decoration groups become empty, the |OpGroupDecorate| and
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// |OpGroupMemberDecorate| instructions will be killed.
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//
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// Decoration instructions that apply directly to |id| will be killed.
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//
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// If |id| is a decoration group and all of the group's decorations are
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// removed, then the |OpGroupDecorate| and
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// |OpGroupMemberDecorate| for the group will be killed, but not the defining
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// |OpDecorationGroup| instruction.
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void RemoveDecorationsFrom(uint32_t id,
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std::function<bool(const Instruction&)> pred =
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[](const Instruction&) { return true; });
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// Removes all decorations from the result id of |inst|.
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//
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// NOTE: This is only meant to be called from ir_context, as only metadata
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// will be removed, and no actual instruction.
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void RemoveDecoration(Instruction* inst);
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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<Instruction*> GetDecorationsFor(uint32_t id,
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bool include_linkage);
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std::vector<const Instruction*> GetDecorationsFor(uint32_t id,
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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 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 HaveSubsetOfDecorations(uint32_t id1, uint32_t id2) const;
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// Returns whether the two decorations instructions are the same and are
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// applying the same decorations; unless |ignore_target| is false, the targets
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// to which they are applied to does not matter, except for the member part.
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//
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// This is only valid for OpDecorate, OpMemberDecorate and OpDecorateId; it
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// will return false for other opcodes.
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bool AreDecorationsTheSame(const Instruction* inst1, const Instruction* inst2,
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bool ignore_target) const;
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// |f| is run on each decoration instruction for |id| with decoration
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// |decoration|. Processed are all decorations which target |id| either
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// directly or indirectly by Decoration Groups.
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void ForEachDecoration(uint32_t id, uint32_t decoration,
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std::function<void(const Instruction&)> f);
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// |f| is run on each decoration instruction for |id| with decoration
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// |decoration|. Processes all decoration which target |id| either directly or
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// indirectly through decoration groups. If |f| returns false, iteration is
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// terminated and this function returns false.
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bool WhileEachDecoration(uint32_t id, uint32_t decoration,
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std::function<bool(const Instruction&)> f);
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// Clone all decorations from one id |from|.
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// The cloned decorations are assigned to the given id |to| and are
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// added to the module. The purpose is to decorate cloned instructions.
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// This function does not check if the id |to| is already decorated.
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void CloneDecorations(uint32_t from, uint32_t to);
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// Same as above, but only clone the decoration if the decoration operand is
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// in |decorations_to_copy|. This function has the extra restriction that
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// |from| and |to| must not be an object, not a type.
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void CloneDecorations(uint32_t from, uint32_t to,
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const std::vector<SpvDecoration>& decorations_to_copy);
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// Informs the decoration manager of a new decoration that it needs to track.
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void AddDecoration(Instruction* inst);
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// Add decoration with |opcode| and operands |opnds|.
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void AddDecoration(SpvOp opcode, const std::vector<Operand> opnds);
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// Add |decoration| of |inst_id| to module.
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void AddDecoration(uint32_t inst_id, uint32_t decoration);
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// Add |decoration, decoration_value| of |inst_id| to module.
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void AddDecorationVal(uint32_t inst_id, uint32_t decoration,
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uint32_t decoration_value);
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// Add |decoration, decoration_value| of |inst_id, member| to module.
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void AddMemberDecoration(uint32_t member, uint32_t inst_id,
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uint32_t decoration, uint32_t decoration_value);
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friend bool operator==(const DecorationManager&, const DecorationManager&);
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friend bool operator!=(const DecorationManager& lhs,
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const DecorationManager& rhs) {
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return !(lhs == rhs);
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}
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private:
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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();
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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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// Tracks decoration information of an ID.
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struct TargetData {
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std::vector<Instruction*> direct_decorations; // All decorate
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// instructions applied
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// to the tracked ID.
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std::vector<Instruction*> indirect_decorations; // All instructions
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// applying a group to
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// the tracked ID.
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std::vector<Instruction*> decorate_insts; // All decorate instructions
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// applying the decorations
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// of the tracked ID to
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// targets.
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// It is empty if the
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// tracked ID is not a
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// group.
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};
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friend bool operator==(const TargetData& lhs, const TargetData& rhs) {
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if (!std::is_permutation(lhs.direct_decorations.begin(),
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lhs.direct_decorations.end(),
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rhs.direct_decorations.begin())) {
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return false;
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}
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if (!std::is_permutation(lhs.indirect_decorations.begin(),
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lhs.indirect_decorations.end(),
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rhs.indirect_decorations.begin())) {
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return false;
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}
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if (!std::is_permutation(lhs.decorate_insts.begin(),
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lhs.decorate_insts.end(),
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rhs.decorate_insts.begin())) {
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return false;
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}
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return true;
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}
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// Mapping from ids to the instructions applying a decoration to those ids.
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// In other words, for each id you get all decoration instructions
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// referencing that id, be it directly (SpvOpDecorate, SpvOpMemberDecorate
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// and SpvOpDecorateId), or indirectly (SpvOpGroupDecorate,
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// SpvOpMemberGroupDecorate).
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std::unordered_map<uint32_t, TargetData> id_to_decoration_insts_;
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// The enclosing module.
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Module* module_;
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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 // SOURCE_OPT_DECORATION_MANAGER_H_
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