SPIRV-Tools/source/fuzz/transformation_add_local_variable.cpp
Alastair Donaldson fcb22ecf0f
spirv-fuzz: Report fresh ids in transformations (#3856)
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.
2020-09-29 22:12:49 +01:00

98 lines
3.4 KiB
C++

// Copyright (c) 2020 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/transformation_add_local_variable.h"
#include "source/fuzz/fuzzer_util.h"
namespace spvtools {
namespace fuzz {
TransformationAddLocalVariable::TransformationAddLocalVariable(
const spvtools::fuzz::protobufs::TransformationAddLocalVariable& message)
: message_(message) {}
TransformationAddLocalVariable::TransformationAddLocalVariable(
uint32_t fresh_id, uint32_t type_id, uint32_t function_id,
uint32_t initializer_id, bool value_is_irrelevant) {
message_.set_fresh_id(fresh_id);
message_.set_type_id(type_id);
message_.set_function_id(function_id);
message_.set_initializer_id(initializer_id);
message_.set_value_is_irrelevant(value_is_irrelevant);
}
bool TransformationAddLocalVariable::IsApplicable(
opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
// The provided id must be fresh.
if (!fuzzerutil::IsFreshId(ir_context, message_.fresh_id())) {
return false;
}
// The pointer type id must indeed correspond to a pointer, and it must have
// function storage class.
auto type_instruction =
ir_context->get_def_use_mgr()->GetDef(message_.type_id());
if (!type_instruction || type_instruction->opcode() != SpvOpTypePointer ||
type_instruction->GetSingleWordInOperand(0) != SpvStorageClassFunction) {
return false;
}
// The initializer must...
auto initializer_instruction =
ir_context->get_def_use_mgr()->GetDef(message_.initializer_id());
// ... exist, ...
if (!initializer_instruction) {
return false;
}
// ... be a constant, ...
if (!spvOpcodeIsConstant(initializer_instruction->opcode())) {
return false;
}
// ... and have the same type as the pointee type.
if (initializer_instruction->type_id() !=
type_instruction->GetSingleWordInOperand(1)) {
return false;
}
// The function to which the local variable is to be added must exist.
return fuzzerutil::FindFunction(ir_context, message_.function_id());
}
void TransformationAddLocalVariable::Apply(
opt::IRContext* ir_context,
TransformationContext* transformation_context) const {
fuzzerutil::AddLocalVariable(ir_context, message_.fresh_id(),
message_.type_id(), message_.function_id(),
message_.initializer_id());
ir_context->InvalidateAnalysesExceptFor(opt::IRContext::kAnalysisNone);
if (message_.value_is_irrelevant()) {
transformation_context->GetFactManager()->AddFactValueOfPointeeIsIrrelevant(
message_.fresh_id());
}
}
protobufs::Transformation TransformationAddLocalVariable::ToMessage() const {
protobufs::Transformation result;
*result.mutable_add_local_variable() = message_;
return result;
}
std::unordered_set<uint32_t> TransformationAddLocalVariable::GetFreshIds()
const {
return {message_.fresh_id()};
}
} // namespace fuzz
} // namespace spvtools