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// Copyright (c) 2019 Google LLC
//
// 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
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SOURCE_OPT_WRAP_OPKILL_H_
#define SOURCE_OPT_WRAP_OPKILL_H_
#include "source/opt/pass.h"
namespace spvtools {
namespace opt {
// Documented in optimizer.hpp
class WrapOpKill : public Pass {
public:
WrapOpKill() : void_type_id_(0) {}
const char* name() const override { return "wrap-opkill"; }
Status Process() override;
IRContext::Analysis GetPreservedAnalyses() override {
return IRContext::kAnalysisDefUse |
IRContext::kAnalysisInstrToBlockMapping |
IRContext::kAnalysisDecorations | IRContext::kAnalysisCombinators |
IRContext::kAnalysisNameMap | IRContext::kAnalysisBuiltinVarId |
IRContext::kAnalysisConstants | IRContext::kAnalysisTypes;
}
private:
// Replaces the OpKill or OpTerminateInvocation instruction |inst| with a
// function call to a function that contains a single instruction, a clone of
// |inst|. An OpUnreachable instruction will be placed after the function
// call. Return true if successful.
bool ReplaceWithFunctionCall(Instruction* inst);
// Returns the id of the void type.
uint32_t GetVoidTypeId();
// Returns the id of the function type for a void function with no parameters.
uint32_t GetVoidFunctionTypeId();
// Return the id of a function that has return type void, has no parameters,
// and contains a single instruction, which is |opcode|, either OpKill or
// OpTerminateInvocation. Returns 0 if the function could not be generated.
uint32_t GetKillingFuncId(SpvOp opcode);
// Returns the id of the return type for the function that contains |inst|.
// Returns 0 if |inst| is not in a function.
uint32_t GetOwningFunctionsReturnType(Instruction* inst);
// The id of the void type. If its value is 0, then the void type has not
// been found or created yet.
uint32_t void_type_id_;
// The function that is a single instruction, which is an OpKill. The
// function has a void return type and takes no parameters. If the function is
// |nullptr|, then the function has not been generated.
std::unique_ptr<Function> opkill_function_;
// The function that is a single instruction, which is an
// OpTerminateInvocation. The function has a void return type and takes no
// parameters. If the function is |nullptr|, then the function has not been
// generated.
std::unique_ptr<Function> opterminateinvocation_function_;
};
} // namespace opt
} // namespace spvtools
#endif // SOURCE_OPT_WRAP_OPKILL_H_
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