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https://github.com/KhronosGroup/SPIRV-Tools
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c2013e248b
Currently it is impossible to invalidate the constnat and type manager. However, the compact ids pass changes the ids for the types and constants, which makes them invalid. This change will make them analyses that have to been explicitly marked as preserved by passes. This will allow compact ids to invalidate them. Fixes #2220.
74 lines
2.9 KiB
C++
74 lines
2.9 KiB
C++
// Copyright (c) 2017 Google Inc.
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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_PRIVATE_TO_LOCAL_PASS_H_
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#define SOURCE_OPT_PRIVATE_TO_LOCAL_PASS_H_
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#include "source/opt/ir_context.h"
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#include "source/opt/pass.h"
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namespace spvtools {
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namespace opt {
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// This pass implements total redundancy elimination. This is the same as
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// local redundancy elimination except it looks across basic block boundaries.
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// An instruction, inst, is totally redundant if there is another instruction
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// that dominates inst, and also computes the same value.
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class PrivateToLocalPass : public Pass {
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public:
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const char* name() const override { return "private-to-local"; }
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Status Process() override;
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IRContext::Analysis GetPreservedAnalyses() override {
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return IRContext::kAnalysisDefUse |
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IRContext::kAnalysisInstrToBlockMapping |
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IRContext::kAnalysisDecorations | IRContext::kAnalysisCombinators |
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IRContext::kAnalysisCFG | IRContext::kAnalysisDominatorAnalysis |
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IRContext::kAnalysisNameMap | IRContext::kAnalysisConstants |
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IRContext::kAnalysisTypes;
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}
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private:
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// Moves |variable| from the private storage class to the function storage
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// class of |function|.
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void MoveVariable(Instruction* variable, Function* function);
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// |inst| is an instruction declaring a varible. If that variable is
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// referenced in a single function and all of uses are valid as defined by
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// |IsValidUse|, then that function is returned. Otherwise, the return
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// value is |nullptr|.
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Function* FindLocalFunction(const Instruction& inst) const;
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// Returns true is |inst| is a valid use of a pointer. In this case, a
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// valid use is one where the transformation is able to rewrite the type to
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// match a change in storage class of the original variable.
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bool IsValidUse(const Instruction* inst) const;
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// Given the result id of a pointer type, |old_type_id|, this function
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// returns the id of a the same pointer type except the storage class has
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// been changed to function. If the type does not already exist, it will be
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// created.
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uint32_t GetNewType(uint32_t old_type_id);
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// Updates |inst|, and any instruction dependent on |inst|, to reflect the
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// change of the base pointer now pointing to the function storage class.
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void UpdateUse(Instruction* inst);
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void UpdateUses(uint32_t id);
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};
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} // namespace opt
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} // namespace spvtools
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#endif // SOURCE_OPT_PRIVATE_TO_LOCAL_PASS_H_
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