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https://github.com/KhronosGroup/SPIRV-Tools
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61d8c0384b
Creates a pass that will remove instructions that are invalid for the current shader stage. For the instruction to be considered for replacement 1) The opcode must be valid for a shader modules. 2) The opcode must be invalid for the current shader stage. 3) All entry points to the module must be for the same shader stage. 4) The function containing the instruction must be reachable from an entry point. Fixes #1247.
66 lines
2.7 KiB
C++
66 lines
2.7 KiB
C++
// Copyright (c) 2018 Google LLC
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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 LIBSPIRV_OPT_REPLACE_INVALID_OPC_H_
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#define LIBSPIRV_OPT_REPLACE_INVALID_OPC_H_
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#include "pass.h"
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namespace spvtools {
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namespace opt {
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// This pass will runs on shader modules only. It will replace the result of
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// instructions that are valid for shader modules, but not the current shader
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// stage, with a constant value. If the instruction does not have a return
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// value, the instruction will simply be deleted.
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class ReplaceInvalidOpcodePass : public Pass {
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public:
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const char* name() const override { return "replace-invalid-opcodes"; }
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Status Process(ir::IRContext*) override;
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private:
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// Returns the execution model that is used by every entry point in the
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// module. If more than one execution model is used in the module, then the
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// return value is SpvExecutionModelMax.
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SpvExecutionModel GetExecutionModel();
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// Replaces all instructions in |function| that are invalid with execution
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// model |mode|, but valid for another shader model, with a special constant
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// value. See |GetSpecialConstant|.
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bool RewriteFunction(ir::Function* function, SpvExecutionModel mode);
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// Returns true if |inst| is valid for fragment shaders only.
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bool IsFragmentShaderOnlyInstruction(ir::Instruction* inst);
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// Replaces all uses of the result of |inst|, if there is one, with the id of
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// a special constant. Then |inst| is killed. |inst| cannot be a block
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// terminator because the basic block will then become invalid. |inst| is no
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// longer valid after calling this function.
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void ReplaceInstruction(ir::Instruction* inst, const char* source,
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uint32_t line_number, uint32_t column_number);
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// Returns the id of a constant with type |type_id|. The type must be an
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// integer, float, or vector. For scalar types, the hex representation of the
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// constant will be the concatenation of 0xDEADBEEF with itself until the
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// width of the type has been reached. For a vector, each element of the
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// constant will be constructed the same way.
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uint32_t GetSpecialConstant(uint32_t type_id);
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std::string BuildWarningMessage(SpvOp opcode);
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};
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} // namespace opt
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} // namespace spvtools
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#endif // LIBSPIRV_OPT_REPLACE_INVALID_OPC_H_
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