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// Copyright (c) 2017 Pierre Moreau
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include <functional>
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include "source/opt/instruction.h"
#include "source/opt/module.h"
namespace spvtools {
namespace opt {
namespace analysis {
// A class for analyzing and managing decorations in an Module.
class DecorationManager {
// Constructs a decoration manager from the given |module|
explicit DecorationManager(Module* module) : module_(module) {
DecorationManager() = delete;
// Changes all of the decorations (direct and through groups) where |pred| is
// true and that apply to |id| so that they no longer apply to |id|.
// If |id| is part of a group, it will be removed from the group if it
// does not use all of the group's decorations, or, if there are no
// decorations that apply to the group.
// If decoration groups become empty, the |OpGroupDecorate| and
// |OpGroupMemberDecorate| instructions will be killed.
// Decoration instructions that apply directly to |id| will be killed.
// If |id| is a decoration group and all of the group's decorations are
// removed, then the |OpGroupDecorate| and
// |OpGroupMemberDecorate| for the group will be killed, but not the defining
// |OpDecorationGroup| instruction.
void RemoveDecorationsFrom(uint32_t id,
std::function<bool(const Instruction&)> pred =
[](const Instruction&) { return true; });
// Removes all decorations from the result id of |inst|.
// NOTE: This is only meant to be called from ir_context, as only metadata
// will be removed, and no actual instruction.
void RemoveDecoration(Instruction* inst);
// Returns a vector of all decorations affecting |id|. If a group is applied
// to |id|, the decorations of that group are returned rather than the group
// decoration instruction. If |include_linkage| is not set, linkage
// decorations won't be returned.
std::vector<Instruction*> GetDecorationsFor(uint32_t id,
bool include_linkage);
std::vector<const Instruction*> GetDecorationsFor(uint32_t id,
bool include_linkage) const;
// Returns whether two IDs have the same decorations. Two SpvOpGroupDecorate
// instructions that apply the same decorations but to different IDs, still
// count as being the same.
bool HaveTheSameDecorations(uint32_t id1, uint32_t id2) const;
// Returns whether two IDs have the same decorations. Two SpvOpGroupDecorate
// instructions that apply the same decorations but to different IDs, still
// count as being the same.
bool HaveSubsetOfDecorations(uint32_t id1, uint32_t id2) const;
// Returns whether the two decorations instructions are the same and are
// applying the same decorations; unless |ignore_target| is false, the targets
// to which they are applied to does not matter, except for the member part.
// This is only valid for OpDecorate, OpMemberDecorate and OpDecorateId; it
// will return false for other opcodes.
bool AreDecorationsTheSame(const Instruction* inst1, const Instruction* inst2,
bool ignore_target) const;
// |f| is run on each decoration instruction for |id| with decoration
// |decoration|. Processed are all decorations which target |id| either
// directly or indirectly by Decoration Groups.
void ForEachDecoration(uint32_t id, uint32_t decoration,
std::function<void(const Instruction&)> f);
// |f| is run on each decoration instruction for |id| with decoration
// |decoration|. Processes all decoration which target |id| either directly or
// indirectly through decoration groups. If |f| returns false, iteration is
// terminated and this function returns false.
bool WhileEachDecoration(uint32_t id, uint32_t decoration,
std::function<bool(const Instruction&)> f);
// Clone all decorations from one id |from|.
// The cloned decorations are assigned to the given id |to| and are
// added to the module. The purpose is to decorate cloned instructions.
// This function does not check if the id |to| is already decorated.
void CloneDecorations(uint32_t from, uint32_t to);
// Same as above, but only clone the decoration if the decoration operand is
// in |decorations_to_copy|. This function has the extra restriction that
// |from| and |to| must not be an object, not a type.
void CloneDecorations(uint32_t from, uint32_t to,
const std::vector<SpvDecoration>& decorations_to_copy);
// Informs the decoration manager of a new decoration that it needs to track.
void AddDecoration(Instruction* inst);
// Add decoration with |opcode| and operands |opnds|.
void AddDecoration(SpvOp opcode, const std::vector<Operand> opnds);
// Add |decoration| of |inst_id| to module.
void AddDecoration(uint32_t inst_id, uint32_t decoration);
// Add |decoration, decoration_value| of |inst_id| to module.
void AddDecorationVal(uint32_t inst_id, uint32_t decoration,
uint32_t decoration_value);
// Add |decoration, decoration_value| of |inst_id, member| to module.
void AddMemberDecoration(uint32_t member, uint32_t inst_id,
uint32_t decoration, uint32_t decoration_value);
friend bool operator==(const DecorationManager&, const DecorationManager&);
friend bool operator!=(const DecorationManager& lhs,
const DecorationManager& rhs) {
return !(lhs == rhs);
// Analyzes the defs and uses in the given |module| and populates data
// structures in this class. Does nothing if |module| is nullptr.
void AnalyzeDecorations();
template <typename T>
std::vector<T> InternalGetDecorationsFor(uint32_t id, bool include_linkage);
// Tracks decoration information of an ID.
struct TargetData {
std::vector<Instruction*> direct_decorations; // All decorate
// instructions applied
// to the tracked ID.
std::vector<Instruction*> indirect_decorations; // All instructions
// applying a group to
// the tracked ID.
std::vector<Instruction*> decorate_insts; // All decorate instructions
// applying the decorations
// of the tracked ID to
// targets.
// It is empty if the
// tracked ID is not a
// group.
friend bool operator==(const TargetData& lhs, const TargetData& rhs) {
if (!std::is_permutation(lhs.direct_decorations.begin(),
rhs.direct_decorations.begin())) {
return false;
if (!std::is_permutation(lhs.indirect_decorations.begin(),
rhs.indirect_decorations.begin())) {
return false;
if (!std::is_permutation(lhs.decorate_insts.begin(),
rhs.decorate_insts.begin())) {
return false;
return true;
// Mapping from ids to the instructions applying a decoration to those ids.
// In other words, for each id you get all decoration instructions
// referencing that id, be it directly (SpvOpDecorate, SpvOpMemberDecorate
// and SpvOpDecorateId), or indirectly (SpvOpGroupDecorate,
// SpvOpMemberGroupDecorate).
std::unordered_map<uint32_t, TargetData> id_to_decoration_insts_;
// The enclosing module.
Module* module_;
} // namespace analysis
} // namespace opt
} // namespace spvtools