source/fuzz/transformation_add_constant_scalar.cpp

   1 // Copyright (c) 2019 Google LLC
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //     http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14
  15 #include "source/fuzz/transformation_add_constant_scalar.h"
  16
  17 #include "source/fuzz/fuzzer_util.h"
  18
  19 namespace spvtools {
  20 namespace fuzz {
  21
  22 TransformationAddConstantScalar::TransformationAddConstantScalar(
  23     spvtools::fuzz::protobufs::TransformationAddConstantScalar message)
  24     : message_(std::move(message)) {}
  25
  26 TransformationAddConstantScalar::TransformationAddConstantScalar(
  27     uint32_t fresh_id, uint32_t type_id, const std::vector<uint32_t>& words,
  28     bool is_irrelevant) {
  29   message_.set_fresh_id(fresh_id);
  30   message_.set_type_id(type_id);
  31   message_.set_is_irrelevant(is_irrelevant);
  32   for (auto word : words) {
  33     message_.add_word(word);
  34   }
  35 }
  36
  37 bool TransformationAddConstantScalar::IsApplicable(
  38     opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
  39   // The id needs to be fresh.
  40   if (!fuzzerutil::IsFreshId(ir_context, message_.fresh_id())) {
  41     return false;
  42   }
  43   // The type id for the scalar must exist and be a type.
  44   auto type = ir_context->get_type_mgr()->GetType(message_.type_id());
  45   if (!type) {
  46     return false;
  47   }
  48   uint32_t width;
  49   if (type->AsFloat()) {
  50     width = type->AsFloat()->width();
  51   } else if (type->AsInteger()) {
  52     width = type->AsInteger()->width();
  53   } else {
  54     return false;
  55   }
  56   // The number of words is the integer floor of the width.
  57   auto words = (width + 32 - 1) / 32;
  58
  59   // The number of words provided by the transformation needs to match the
  60   // width of the type.
  61   return static_cast<uint32_t>(message_.word().size()) == words;
  62 }
  63
  64 void TransformationAddConstantScalar::Apply(
  65     opt::IRContext* ir_context,
  66     TransformationContext* transformation_context) const {
  67   auto new_instruction = MakeUnique<opt::Instruction>(
  68       ir_context, spv::Op::OpConstant, message_.type_id(), message_.fresh_id(),
  69       opt::Instruction::OperandList(
  70           {{SPV_OPERAND_TYPE_LITERAL_INTEGER,
  71             std::vector<uint32_t>(message_.word().begin(),
  72                                   message_.word().end())}}));
  73   auto new_instruction_ptr = new_instruction.get();
  74   ir_context->module()->AddGlobalValue(std::move(new_instruction));
  75
  76   fuzzerutil::UpdateModuleIdBound(ir_context, message_.fresh_id());
  77
  78   // Inform the def-use manager about the new instruction. Invalidate the
  79   // constant manager as we have added a new constant.
  80   ir_context->get_def_use_mgr()->AnalyzeInstDef(new_instruction_ptr);
  81   ir_context->InvalidateAnalyses(opt::IRContext::kAnalysisConstants);
  82
  83   if (message_.is_irrelevant()) {
  84     transformation_context->GetFactManager()->AddFactIdIsIrrelevant(
  85         message_.fresh_id());
  86   }
  87 }
  88
  89 protobufs::Transformation TransformationAddConstantScalar::ToMessage() const {
  90   protobufs::Transformation result;
  91   *result.mutable_add_constant_scalar() = message_;
  92   return result;
  93 }
  94
  95 std::unordered_set<uint32_t> TransformationAddConstantScalar::GetFreshIds()
  96     const {
  97   return {message_.fresh_id()};
  98 }
  99
 100 }  // namespace fuzz
 101 }  // namespace spvtools