mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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3eda1b9ff1
A refactoring that separates the identification of an instruction from the identification of a use in an instruction, to enable the former to be used independently of the latter.
71 lines
2.5 KiB
C++
71 lines
2.5 KiB
C++
// Copyright (c) 2019 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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#include "source/fuzz/instruction_descriptor.h"
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namespace spvtools {
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namespace fuzz {
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opt::Instruction* FindInstruction(
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const protobufs::InstructionDescriptor& instruction_descriptor,
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spvtools::opt::IRContext* context) {
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for (auto& function : *context->module()) {
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for (auto& block : function) {
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bool found_base =
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block.id() == instruction_descriptor.base_instruction_result_id();
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uint32_t num_ignored = 0;
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for (auto& instruction : block) {
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if (instruction.HasResultId() &&
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instruction.result_id() ==
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instruction_descriptor.base_instruction_result_id()) {
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assert(!found_base &&
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"It should not be possible to find the base instruction "
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"multiple times.");
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found_base = true;
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assert(num_ignored == 0 &&
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"The skipped instruction count should only be incremented "
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"after the instruction base has been found.");
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}
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if (found_base &&
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instruction.opcode() ==
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instruction_descriptor.target_instruction_opcode()) {
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if (num_ignored == instruction_descriptor.num_opcodes_to_ignore()) {
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return &instruction;
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}
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num_ignored++;
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}
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}
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if (found_base) {
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// We found the base instruction, but did not find the target
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// instruction in the same block.
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return nullptr;
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}
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}
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}
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return nullptr;
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}
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protobufs::InstructionDescriptor MakeInstructionDescriptor(
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uint32_t base_instruction_result_id, SpvOp target_instruction_opcode,
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uint32_t num_opcodes_to_ignore) {
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protobufs::InstructionDescriptor result;
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result.set_base_instruction_result_id(base_instruction_result_id);
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result.set_target_instruction_opcode(target_instruction_opcode);
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result.set_num_opcodes_to_ignore(num_opcodes_to_ignore);
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return result;
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}
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} // namespace fuzz
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} // namespace spvtools
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