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// 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_early_terminator_wrapper.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/util/make_unique.h"
namespace spvtools {
namespace fuzz {
TransformationAddEarlyTerminatorWrapper::
TransformationAddEarlyTerminatorWrapper(
protobufs::TransformationAddEarlyTerminatorWrapper message)
: message_(std::move(message)) {}
TransformationAddEarlyTerminatorWrapper::
TransformationAddEarlyTerminatorWrapper(uint32_t function_fresh_id,
uint32_t label_fresh_id,
spv::Op opcode) {
message_.set_function_fresh_id(function_fresh_id);
message_.set_label_fresh_id(label_fresh_id);
message_.set_opcode(uint32_t(opcode));
}
bool TransformationAddEarlyTerminatorWrapper::IsApplicable(
opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
assert((spv::Op(message_.opcode()) == spv::Op::OpKill ||
spv::Op(message_.opcode()) == spv::Op::OpUnreachable ||
spv::Op(message_.opcode()) == spv::Op::OpTerminateInvocation) &&
"Invalid opcode.");
if (!fuzzerutil::IsFreshId(ir_context, message_.function_fresh_id())) {
return false;
}
if (!fuzzerutil::IsFreshId(ir_context, message_.label_fresh_id())) {
return false;
}
if (message_.function_fresh_id() == message_.label_fresh_id()) {
return false;
}
uint32_t void_type_id = fuzzerutil::MaybeGetVoidType(ir_context);
if (!void_type_id) {
return false;
}
return fuzzerutil::FindFunctionType(ir_context, {void_type_id});
}
void TransformationAddEarlyTerminatorWrapper::Apply(
opt::IRContext* ir_context, TransformationContext* /*unused*/) const {
fuzzerutil::UpdateModuleIdBound(ir_context, message_.function_fresh_id());
fuzzerutil::UpdateModuleIdBound(ir_context, message_.label_fresh_id());
// Create a basic block of the form:
// %label_fresh_id = OpLabel
// OpKill|Unreachable|TerminateInvocation
auto basic_block = MakeUnique<opt::BasicBlock>(MakeUnique<opt::Instruction>(
ir_context, spv::Op::OpLabel, 0, message_.label_fresh_id(),
opt::Instruction::OperandList()));
basic_block->AddInstruction(MakeUnique<opt::Instruction>(
ir_context, static_cast<spv::Op>(message_.opcode()), 0, 0,
opt::Instruction::OperandList()));
// Create a zero-argument void function.
auto void_type_id = fuzzerutil::MaybeGetVoidType(ir_context);
auto function = MakeUnique<opt::Function>(MakeUnique<opt::Instruction>(
ir_context, spv::Op::OpFunction, void_type_id,
message_.function_fresh_id(),
opt::Instruction::OperandList(
{{SPV_OPERAND_TYPE_FUNCTION_CONTROL,
{uint32_t(spv::FunctionControlMask::MaskNone)}},
{SPV_OPERAND_TYPE_TYPE_ID,
{fuzzerutil::FindFunctionType(ir_context, {void_type_id})}}})));
// Add the basic block to the function as the sole block, and add the function
// to the module.
function->AddBasicBlock(std::move(basic_block));
function->SetFunctionEnd(
MakeUnique<opt::Instruction>(ir_context, spv::Op::OpFunctionEnd, 0, 0,
opt::Instruction::OperandList()));
ir_context->module()->AddFunction(std::move(function));
ir_context->InvalidateAnalysesExceptFor(opt::IRContext::kAnalysisNone);
}
std::unordered_set<uint32_t>
TransformationAddEarlyTerminatorWrapper::GetFreshIds() const {
return std::unordered_set<uint32_t>(
{message_.function_fresh_id(), message_.label_fresh_id()});
}
protobufs::Transformation TransformationAddEarlyTerminatorWrapper::ToMessage()
const {
protobufs::Transformation result;
*result.mutable_add_early_terminator_wrapper() = message_;
return result;
}
} // namespace fuzz
} // namespace spvtools
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