mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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fcb22ecf0f
Adds a virtual method, GetFreshIds(), to Transformation. Every transformation uses this to indicate which ids in its protobuf message are fresh ids. This means that when replaying a sequence of transformations the replayer can obtain a smallest id that is not in use by the module already and that will not be used by any transformation by necessity. Ids greater than or equal to this id can be used as overflow ids. Fixes #3851.
125 lines
4.2 KiB
C++
125 lines
4.2 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/transformation_add_global_variable.h"
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#include "source/fuzz/fuzzer_util.h"
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namespace spvtools {
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namespace fuzz {
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TransformationAddGlobalVariable::TransformationAddGlobalVariable(
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const spvtools::fuzz::protobufs::TransformationAddGlobalVariable& message)
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: message_(message) {}
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TransformationAddGlobalVariable::TransformationAddGlobalVariable(
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uint32_t fresh_id, uint32_t type_id, SpvStorageClass storage_class,
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uint32_t initializer_id, bool value_is_irrelevant) {
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message_.set_fresh_id(fresh_id);
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message_.set_type_id(type_id);
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message_.set_storage_class(storage_class);
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message_.set_initializer_id(initializer_id);
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message_.set_value_is_irrelevant(value_is_irrelevant);
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}
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bool TransformationAddGlobalVariable::IsApplicable(
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opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
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// The result id must be fresh.
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if (!fuzzerutil::IsFreshId(ir_context, message_.fresh_id())) {
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return false;
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}
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// The storage class must be Private or Workgroup.
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auto storage_class = static_cast<SpvStorageClass>(message_.storage_class());
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switch (storage_class) {
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case SpvStorageClassPrivate:
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case SpvStorageClassWorkgroup:
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break;
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default:
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assert(false && "Unsupported storage class.");
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return false;
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}
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// The type id must correspond to a type.
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auto type = ir_context->get_type_mgr()->GetType(message_.type_id());
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if (!type) {
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return false;
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}
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// That type must be a pointer type ...
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auto pointer_type = type->AsPointer();
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if (!pointer_type) {
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return false;
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}
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// ... with the right storage class.
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if (pointer_type->storage_class() != storage_class) {
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return false;
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}
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if (message_.initializer_id()) {
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// An initializer is not allowed if the storage class is Workgroup.
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if (storage_class == SpvStorageClassWorkgroup) {
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assert(false &&
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"By construction this transformation should not have an "
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"initializer when Workgroup storage class is used.");
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return false;
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}
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// The initializer id must be the id of a constant. Check this with the
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// constant manager.
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auto constant_id = ir_context->get_constant_mgr()->GetConstantsFromIds(
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{message_.initializer_id()});
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if (constant_id.empty()) {
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return false;
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}
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assert(constant_id.size() == 1 &&
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"We asked for the constant associated with a single id; we should "
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"get a single constant.");
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// The type of the constant must match the pointee type of the pointer.
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if (pointer_type->pointee_type() != constant_id[0]->type()) {
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return false;
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}
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}
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return true;
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}
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void TransformationAddGlobalVariable::Apply(
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opt::IRContext* ir_context,
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TransformationContext* transformation_context) const {
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fuzzerutil::AddGlobalVariable(
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ir_context, message_.fresh_id(), message_.type_id(),
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static_cast<SpvStorageClass>(message_.storage_class()),
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message_.initializer_id());
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// We have added an instruction to the module, so need to be careful about the
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// validity of existing analyses.
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ir_context->InvalidateAnalysesExceptFor(
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opt::IRContext::Analysis::kAnalysisNone);
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if (message_.value_is_irrelevant()) {
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transformation_context->GetFactManager()->AddFactValueOfPointeeIsIrrelevant(
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message_.fresh_id());
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}
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}
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protobufs::Transformation TransformationAddGlobalVariable::ToMessage() const {
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protobufs::Transformation result;
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*result.mutable_add_global_variable() = message_;
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return result;
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}
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std::unordered_set<uint32_t> TransformationAddGlobalVariable::GetFreshIds()
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const {
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return {message_.fresh_id()};
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}
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} // namespace fuzz
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} // namespace spvtools
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