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128 lines
4.7 KiB
128 lines
4.7 KiB
// 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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protobufs::InstructionDescriptor MakeInstructionDescriptor(
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const opt::BasicBlock& block,
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const opt::BasicBlock::const_iterator& inst_it) {
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const SpvOp opcode =
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inst_it->opcode(); // The opcode of the instruction being described.
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uint32_t skip_count = 0; // The number of these opcodes we have skipped when
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// searching backwards.
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// Consider instructions in the block in reverse order, starting from
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// |inst_it|.
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for (opt::BasicBlock::const_iterator backwards_iterator = inst_it;;
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--backwards_iterator) {
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if (backwards_iterator->HasResultId()) {
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// As soon as we find an instruction with a result id, we can return a
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// descriptor for |inst_it|.
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return MakeInstructionDescriptor(backwards_iterator->result_id(), opcode,
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skip_count);
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}
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if (backwards_iterator != inst_it &&
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backwards_iterator->opcode() == opcode) {
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// We are skipping over an instruction with the same opcode as |inst_it|;
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// we increase our skip count to reflect this.
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skip_count++;
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}
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if (backwards_iterator == block.begin()) {
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// We exit the loop when we reach the start of the block, but only after
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// we have processed the first instruction in the block.
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break;
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}
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}
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// We did not find an instruction inside the block with a result id, so we use
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// the block's label's id.
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return MakeInstructionDescriptor(block.id(), opcode, skip_count);
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}
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protobufs::InstructionDescriptor MakeInstructionDescriptor(
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opt::IRContext* context, opt::Instruction* inst) {
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auto block = context->get_instr_block(inst);
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uint32_t base_instruction_result_id = block->id();
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uint32_t num_opcodes_to_ignore = 0;
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for (auto& inst_in_block : *block) {
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if (inst_in_block.HasResultId()) {
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base_instruction_result_id = inst_in_block.result_id();
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num_opcodes_to_ignore = 0;
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}
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if (&inst_in_block == inst) {
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return MakeInstructionDescriptor(base_instruction_result_id,
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inst->opcode(), num_opcodes_to_ignore);
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}
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if (inst_in_block.opcode() == inst->opcode()) {
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num_opcodes_to_ignore++;
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}
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}
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assert(false && "No matching instruction was found.");
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return protobufs::InstructionDescriptor();
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}
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} // namespace fuzz
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} // namespace spvtools
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