source/fuzz/transformation_add_early_terminator_wrapper.cpp

   1 // Copyright (c) 2020 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_early_terminator_wrapper.h"
  16
  17 #include "source/fuzz/fuzzer_util.h"
  18 #include "source/util/make_unique.h"
  19
  20 namespace spvtools {
  21 namespace fuzz {
  22
  23 TransformationAddEarlyTerminatorWrapper::
  24     TransformationAddEarlyTerminatorWrapper(
  25         protobufs::TransformationAddEarlyTerminatorWrapper message)
  26     : message_(std::move(message)) {}
  27
  28 TransformationAddEarlyTerminatorWrapper::
  29     TransformationAddEarlyTerminatorWrapper(uint32_t function_fresh_id,
  30                                             uint32_t label_fresh_id,
  31                                             spv::Op opcode) {
  32   message_.set_function_fresh_id(function_fresh_id);
  33   message_.set_label_fresh_id(label_fresh_id);
  34   message_.set_opcode(uint32_t(opcode));
  35 }
  36
  37 bool TransformationAddEarlyTerminatorWrapper::IsApplicable(
  38     opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
  39   assert((spv::Op(message_.opcode()) == spv::Op::OpKill ||
  40           spv::Op(message_.opcode()) == spv::Op::OpUnreachable ||
  41           spv::Op(message_.opcode()) == spv::Op::OpTerminateInvocation) &&
  42          "Invalid opcode.");
  43
  44   if (!fuzzerutil::IsFreshId(ir_context, message_.function_fresh_id())) {
  45     return false;
  46   }
  47   if (!fuzzerutil::IsFreshId(ir_context, message_.label_fresh_id())) {
  48     return false;
  49   }
  50   if (message_.function_fresh_id() == message_.label_fresh_id()) {
  51     return false;
  52   }
  53   uint32_t void_type_id = fuzzerutil::MaybeGetVoidType(ir_context);
  54   if (!void_type_id) {
  55     return false;
  56   }
  57   return fuzzerutil::FindFunctionType(ir_context, {void_type_id});
  58 }
  59
  60 void TransformationAddEarlyTerminatorWrapper::Apply(
  61     opt::IRContext* ir_context, TransformationContext* /*unused*/) const {
  62   fuzzerutil::UpdateModuleIdBound(ir_context, message_.function_fresh_id());
  63   fuzzerutil::UpdateModuleIdBound(ir_context, message_.label_fresh_id());
  64
  65   // Create a basic block of the form:
  66   // %label_fresh_id = OpLabel
  67   //                   OpKill|Unreachable|TerminateInvocation
  68   auto basic_block = MakeUnique<opt::BasicBlock>(MakeUnique<opt::Instruction>(
  69       ir_context, spv::Op::OpLabel, 0, message_.label_fresh_id(),
  70       opt::Instruction::OperandList()));
  71   basic_block->AddInstruction(MakeUnique<opt::Instruction>(
  72       ir_context, static_cast<spv::Op>(message_.opcode()), 0, 0,
  73       opt::Instruction::OperandList()));
  74
  75   // Create a zero-argument void function.
  76   auto void_type_id = fuzzerutil::MaybeGetVoidType(ir_context);
  77   auto function = MakeUnique<opt::Function>(MakeUnique<opt::Instruction>(
  78       ir_context, spv::Op::OpFunction, void_type_id,
  79       message_.function_fresh_id(),
  80       opt::Instruction::OperandList(
  81           {{SPV_OPERAND_TYPE_FUNCTION_CONTROL,
  82             {uint32_t(spv::FunctionControlMask::MaskNone)}},
  83            {SPV_OPERAND_TYPE_TYPE_ID,
  84             {fuzzerutil::FindFunctionType(ir_context, {void_type_id})}}})));
  85
  86   // Add the basic block to the function as the sole block, and add the function
  87   // to the module.
  88   function->AddBasicBlock(std::move(basic_block));
  89   function->SetFunctionEnd(
  90       MakeUnique<opt::Instruction>(ir_context, spv::Op::OpFunctionEnd, 0, 0,
  91                                    opt::Instruction::OperandList()));
  92   ir_context->module()->AddFunction(std::move(function));
  93
  94   ir_context->InvalidateAnalysesExceptFor(opt::IRContext::kAnalysisNone);
  95 }
  96
  97 std::unordered_set<uint32_t>
  98 TransformationAddEarlyTerminatorWrapper::GetFreshIds() const {
  99   return std::unordered_set<uint32_t>(
 100       {message_.function_fresh_id(), message_.label_fresh_id()});
 101 }
 102
 103 protobufs::Transformation TransformationAddEarlyTerminatorWrapper::ToMessage()
 104     const {
 105   protobufs::Transformation result;
 106   *result.mutable_add_early_terminator_wrapper() = message_;
 107   return result;
 108 }
 109
 110 }  // namespace fuzz
 111 }  // namespace spvtools