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// Copyright (c) 2018 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_REPLACE_INVALID_OPC_H_
#define SOURCE_OPT_REPLACE_INVALID_OPC_H_
#include <string>
#include "source/opt/pass.h"
namespace spvtools {
namespace opt {
// This pass will runs on shader modules only. It will replace the result of
// instructions that are valid for shader modules, but not the current shader
// stage, with a constant value. If the instruction does not have a return
// value, the instruction will simply be deleted.
class ReplaceInvalidOpcodePass : public Pass {
public:
const char* name() const override { return "replace-invalid-opcode"; }
Status Process() override;
private:
// Returns the execution model that is used by every entry point in the
// module. If more than one execution model is used in the module, then the
// return value is spv::ExecutionModel::Max.
spv::ExecutionModel GetExecutionModel();
// Replaces all instructions in |function| that are invalid with execution
// model |mode|, but valid for another shader model, with a special constant
// value. See |GetSpecialConstant|.
bool RewriteFunction(Function* function, spv::ExecutionModel mode);
// Returns true if |inst| is valid for fragment shaders only.
bool IsFragmentShaderOnlyInstruction(Instruction* inst);
// Replaces all uses of the result of |inst|, if there is one, with the id of
// a special constant. Then |inst| is killed. |inst| cannot be a block
// terminator because the basic block will then become invalid. |inst| is no
// longer valid after calling this function.
void ReplaceInstruction(Instruction* inst, const char* source,
uint32_t line_number, uint32_t column_number);
// Returns the id of a constant with type |type_id|. The type must be an
// integer, float, or vector. For scalar types, the hex representation of the
// constant will be the concatenation of 0xDEADBEEF with itself until the
// width of the type has been reached. For a vector, each element of the
// constant will be constructed the same way.
uint32_t GetSpecialConstant(uint32_t type_id);
std::string BuildWarningMessage(spv::Op opcode);
};
} // namespace opt
} // namespace spvtools
#endif // SOURCE_OPT_REPLACE_INVALID_OPC_H_
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