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https://github.com/KhronosGroup/SPIRV-Tools
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5e5929455f
`FuzzerPassInterchangeSignednessOfIntegerOperands` and `FuzzerPassInterchangeZeroLikeConstants` both included specialization constants when trying to find integer constants with known values. However, this is incorrect behavior because we do not know the value of specialization constants. Furthermore, ConstantManager does not support them, and this led to crashes where we assumed we could look up specialization constants via the ConstantManager. This change fixes both passes to ignore specialization constants. Fixes #3663.
117 lines
4.3 KiB
C++
117 lines
4.3 KiB
C++
// Copyright (c) 2020 Stefano Milizia
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// Copyright (c) 2020 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/fuzzer_pass_interchange_zero_like_constants.h"
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#include "source/fuzz/fuzzer_util.h"
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#include "source/fuzz/id_use_descriptor.h"
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#include "source/fuzz/transformation_record_synonymous_constants.h"
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#include "source/fuzz/transformation_replace_id_with_synonym.h"
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namespace spvtools {
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namespace fuzz {
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FuzzerPassInterchangeZeroLikeConstants::FuzzerPassInterchangeZeroLikeConstants(
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opt::IRContext* ir_context, TransformationContext* transformation_context,
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FuzzerContext* fuzzer_context,
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protobufs::TransformationSequence* transformations)
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: FuzzerPass(ir_context, transformation_context, fuzzer_context,
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transformations) {}
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FuzzerPassInterchangeZeroLikeConstants::
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~FuzzerPassInterchangeZeroLikeConstants() = default;
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uint32_t FuzzerPassInterchangeZeroLikeConstants::FindOrCreateToggledConstant(
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opt::Instruction* declaration) {
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// |declaration| must not be a specialization constant because we do not know
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// the value of specialization constants.
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if (opt::IsSpecConstantInst(declaration->opcode())) {
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return 0;
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}
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auto constant = GetIRContext()->get_constant_mgr()->FindDeclaredConstant(
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declaration->result_id());
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// This pass only toggles zero-like constants
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if (!constant->IsZero()) {
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return 0;
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}
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if (constant->AsScalarConstant()) {
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return FindOrCreateNullConstant(declaration->type_id());
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} else if (constant->AsNullConstant()) {
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// Add declaration of equivalent scalar constant
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auto kind = constant->type()->kind();
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if (kind == opt::analysis::Type::kBool ||
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kind == opt::analysis::Type::kInteger ||
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kind == opt::analysis::Type::kFloat) {
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return FindOrCreateZeroConstant(declaration->type_id(), false);
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}
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}
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return 0;
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}
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void FuzzerPassInterchangeZeroLikeConstants::Apply() {
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// Make vector keeping track of all the uses we want to replace.
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// This is a vector of pairs, where the first element is an id use descriptor
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// identifying the use of a constant id and the second is the id that should
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// be used to replace it.
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std::vector<std::pair<protobufs::IdUseDescriptor, uint32_t>> uses_to_replace;
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for (auto constant : GetIRContext()->GetConstants()) {
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uint32_t constant_id = constant->result_id();
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if (GetTransformationContext()->GetFactManager()->IdIsIrrelevant(
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constant_id)) {
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continue;
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}
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uint32_t toggled_id = FindOrCreateToggledConstant(constant);
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if (!toggled_id) {
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// Not a zero-like constant
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continue;
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}
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assert(!GetTransformationContext()->GetFactManager()->IdIsIrrelevant(
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toggled_id) &&
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"FindOrCreateToggledConstant can't produce an irrelevant id");
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// Record synonymous constants
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ApplyTransformation(
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TransformationRecordSynonymousConstants(constant_id, toggled_id));
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// Find all the uses of the constant and, for each, probabilistically
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// decide whether to replace it.
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GetIRContext()->get_def_use_mgr()->ForEachUse(
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constant_id,
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[this, toggled_id, &uses_to_replace](opt::Instruction* use_inst,
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uint32_t use_index) -> void {
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if (GetFuzzerContext()->ChoosePercentage(
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GetFuzzerContext()
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->GetChanceOfInterchangingZeroLikeConstants())) {
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MaybeAddUseToReplace(use_inst, use_index, toggled_id,
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&uses_to_replace);
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}
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});
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}
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// Replace the ids if it is allowed.
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for (auto use_to_replace : uses_to_replace) {
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MaybeApplyTransformation(TransformationReplaceIdWithSynonym(
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use_to_replace.first, use_to_replace.second));
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}
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}
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} // namespace fuzz
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} // namespace spvtools
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