mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-12-27 02:10:15 +00:00
8866fd7ae2
Avoids redundantly searching the whome module when locating an instruction from its descriptor - instead, only the block containing the instruction needs to be searched.
123 lines
4.6 KiB
C++
123 lines
4.6 KiB
C++
// 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.
|
|
|
|
#include "source/fuzz/instruction_descriptor.h"
|
|
|
|
namespace spvtools {
|
|
namespace fuzz {
|
|
|
|
opt::Instruction* FindInstruction(
|
|
const protobufs::InstructionDescriptor& instruction_descriptor,
|
|
spvtools::opt::IRContext* context) {
|
|
auto block = context->get_instr_block(
|
|
instruction_descriptor.base_instruction_result_id());
|
|
if (block == nullptr) {
|
|
return nullptr;
|
|
}
|
|
bool found_base =
|
|
block->id() == instruction_descriptor.base_instruction_result_id();
|
|
uint32_t num_ignored = 0;
|
|
for (auto& instruction : *block) {
|
|
if (instruction.HasResultId() &&
|
|
instruction.result_id() ==
|
|
instruction_descriptor.base_instruction_result_id()) {
|
|
assert(!found_base &&
|
|
"It should not be possible to find the base instruction "
|
|
"multiple times.");
|
|
found_base = true;
|
|
assert(num_ignored == 0 &&
|
|
"The skipped instruction count should only be incremented "
|
|
"after the instruction base has been found.");
|
|
}
|
|
if (found_base && instruction.opcode() ==
|
|
instruction_descriptor.target_instruction_opcode()) {
|
|
if (num_ignored == instruction_descriptor.num_opcodes_to_ignore()) {
|
|
return &instruction;
|
|
}
|
|
num_ignored++;
|
|
}
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
protobufs::InstructionDescriptor MakeInstructionDescriptor(
|
|
uint32_t base_instruction_result_id, SpvOp target_instruction_opcode,
|
|
uint32_t num_opcodes_to_ignore) {
|
|
protobufs::InstructionDescriptor result;
|
|
result.set_base_instruction_result_id(base_instruction_result_id);
|
|
result.set_target_instruction_opcode(target_instruction_opcode);
|
|
result.set_num_opcodes_to_ignore(num_opcodes_to_ignore);
|
|
return result;
|
|
}
|
|
|
|
protobufs::InstructionDescriptor MakeInstructionDescriptor(
|
|
const opt::BasicBlock& block,
|
|
const opt::BasicBlock::const_iterator& inst_it) {
|
|
const SpvOp opcode =
|
|
inst_it->opcode(); // The opcode of the instruction being described.
|
|
uint32_t skip_count = 0; // The number of these opcodes we have skipped when
|
|
// searching backwards.
|
|
|
|
// Consider instructions in the block in reverse order, starting from
|
|
// |inst_it|.
|
|
for (opt::BasicBlock::const_iterator backwards_iterator = inst_it;;
|
|
--backwards_iterator) {
|
|
if (backwards_iterator->HasResultId()) {
|
|
// As soon as we find an instruction with a result id, we can return a
|
|
// descriptor for |inst_it|.
|
|
return MakeInstructionDescriptor(backwards_iterator->result_id(), opcode,
|
|
skip_count);
|
|
}
|
|
if (backwards_iterator != inst_it &&
|
|
backwards_iterator->opcode() == opcode) {
|
|
// We are skipping over an instruction with the same opcode as |inst_it|;
|
|
// we increase our skip count to reflect this.
|
|
skip_count++;
|
|
}
|
|
if (backwards_iterator == block.begin()) {
|
|
// We exit the loop when we reach the start of the block, but only after
|
|
// we have processed the first instruction in the block.
|
|
break;
|
|
}
|
|
}
|
|
// We did not find an instruction inside the block with a result id, so we use
|
|
// the block's label's id.
|
|
return MakeInstructionDescriptor(block.id(), opcode, skip_count);
|
|
}
|
|
|
|
protobufs::InstructionDescriptor MakeInstructionDescriptor(
|
|
opt::IRContext* context, opt::Instruction* inst) {
|
|
auto block = context->get_instr_block(inst);
|
|
uint32_t base_instruction_result_id = block->id();
|
|
uint32_t num_opcodes_to_ignore = 0;
|
|
for (auto& inst_in_block : *block) {
|
|
if (inst_in_block.HasResultId()) {
|
|
base_instruction_result_id = inst_in_block.result_id();
|
|
num_opcodes_to_ignore = 0;
|
|
}
|
|
if (&inst_in_block == inst) {
|
|
return MakeInstructionDescriptor(base_instruction_result_id,
|
|
inst->opcode(), num_opcodes_to_ignore);
|
|
}
|
|
if (inst_in_block.opcode() == inst->opcode()) {
|
|
num_opcodes_to_ignore++;
|
|
}
|
|
}
|
|
assert(false && "No matching instruction was found.");
|
|
return protobufs::InstructionDescriptor();
|
|
}
|
|
|
|
} // namespace fuzz
|
|
} // namespace spvtools
|