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https://github.com/KhronosGroup/SPIRV-Tools
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d35a78db57
Fixes #4960 * Switches to using enum classes with an underlying type to avoid undefined behaviour
106 lines
3.7 KiB
C++
106 lines
3.7 KiB
C++
// 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/transformation_add_local_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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TransformationAddLocalVariable::TransformationAddLocalVariable(
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spvtools::fuzz::protobufs::TransformationAddLocalVariable message)
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: message_(std::move(message)) {}
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TransformationAddLocalVariable::TransformationAddLocalVariable(
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uint32_t fresh_id, uint32_t type_id, uint32_t function_id,
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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_function_id(function_id);
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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 TransformationAddLocalVariable::IsApplicable(
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opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
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// The provided 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 pointer type id must indeed correspond to a pointer, and it must have
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// function storage class.
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auto type_instruction =
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ir_context->get_def_use_mgr()->GetDef(message_.type_id());
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if (!type_instruction ||
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type_instruction->opcode() != spv::Op::OpTypePointer ||
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spv::StorageClass(type_instruction->GetSingleWordInOperand(0)) !=
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spv::StorageClass::Function) {
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return false;
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}
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// The initializer must...
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auto initializer_instruction =
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ir_context->get_def_use_mgr()->GetDef(message_.initializer_id());
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// ... exist, ...
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if (!initializer_instruction) {
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return false;
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}
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// ... be a constant, ...
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if (!spvOpcodeIsConstant(initializer_instruction->opcode())) {
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return false;
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}
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// ... and have the same type as the pointee type.
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if (initializer_instruction->type_id() !=
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type_instruction->GetSingleWordInOperand(1)) {
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return false;
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}
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// The function to which the local variable is to be added must exist.
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return fuzzerutil::FindFunction(ir_context, message_.function_id());
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}
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void TransformationAddLocalVariable::Apply(
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opt::IRContext* ir_context,
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TransformationContext* transformation_context) const {
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opt::Instruction* new_instruction = fuzzerutil::AddLocalVariable(
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ir_context, message_.fresh_id(), message_.type_id(),
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message_.function_id(), message_.initializer_id());
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// Inform the def-use manager about the new instruction.
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ir_context->get_def_use_mgr()->AnalyzeInstDefUse(new_instruction);
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ir_context->set_instr_block(
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new_instruction,
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fuzzerutil::FindFunction(ir_context, message_.function_id())
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->entry()
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.get());
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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 TransformationAddLocalVariable::ToMessage() const {
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protobufs::Transformation result;
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*result.mutable_add_local_variable() = message_;
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return result;
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}
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std::unordered_set<uint32_t> TransformationAddLocalVariable::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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