SPIRV-Tools/source/fuzz/transformation_equation_instruction.cpp

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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_equation_instruction.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/instruction_descriptor.h"
namespace spvtools {
namespace fuzz {
TransformationEquationInstruction::TransformationEquationInstruction(
protobufs::TransformationEquationInstruction message)
: message_(std::move(message)) {}
TransformationEquationInstruction::TransformationEquationInstruction(
uint32_t fresh_id, spv::Op opcode,
const std::vector<uint32_t>& in_operand_id,
const protobufs::InstructionDescriptor& instruction_to_insert_before) {
message_.set_fresh_id(fresh_id);
message_.set_opcode(uint32_t(opcode));
for (auto id : in_operand_id) {
message_.add_in_operand_id(id);
}
*message_.mutable_instruction_to_insert_before() =
instruction_to_insert_before;
}
bool TransformationEquationInstruction::IsApplicable(
opt::IRContext* ir_context,
const TransformationContext& transformation_context) const {
// The result id must be fresh.
if (!fuzzerutil::IsFreshId(ir_context, message_.fresh_id())) {
return false;
}
// The instruction to insert before must exist.
auto insert_before =
FindInstruction(message_.instruction_to_insert_before(), ir_context);
if (!insert_before) {
return false;
}
// The input ids must all exist, not be OpUndef, not be irrelevant, and be
// available before this instruction.
for (auto id : message_.in_operand_id()) {
auto inst = ir_context->get_def_use_mgr()->GetDef(id);
if (!inst) {
return false;
}
if (inst->opcode() == spv::Op::OpUndef) {
return false;
}
if (transformation_context.GetFactManager()->IdIsIrrelevant(id)) {
return false;
}
if (!fuzzerutil::IdIsAvailableBeforeInstruction(ir_context, insert_before,
id)) {
return false;
}
}
return MaybeGetResultTypeId(ir_context) != 0;
}
void TransformationEquationInstruction::Apply(
opt::IRContext* ir_context,
TransformationContext* transformation_context) const {
fuzzerutil::UpdateModuleIdBound(ir_context, message_.fresh_id());
opt::Instruction::OperandList in_operands;
std::vector<uint32_t> rhs_id;
for (auto id : message_.in_operand_id()) {
in_operands.push_back({SPV_OPERAND_TYPE_ID, {id}});
rhs_id.push_back(id);
}
auto insert_before =
FindInstruction(message_.instruction_to_insert_before(), ir_context);
opt::Instruction* new_instruction =
insert_before->InsertBefore(MakeUnique<opt::Instruction>(
ir_context, static_cast<spv::Op>(message_.opcode()),
MaybeGetResultTypeId(ir_context), message_.fresh_id(),
std::move(in_operands)));
ir_context->get_def_use_mgr()->AnalyzeInstDefUse(new_instruction);
ir_context->set_instr_block(new_instruction,
ir_context->get_instr_block(insert_before));
// Add an equation fact as long as the result id is not irrelevant (it could
// be if we are inserting into a dead block).
if (!transformation_context->GetFactManager()->IdIsIrrelevant(
message_.fresh_id())) {
transformation_context->GetFactManager()->AddFactIdEquation(
message_.fresh_id(), static_cast<spv::Op>(message_.opcode()), rhs_id);
}
}
protobufs::Transformation TransformationEquationInstruction::ToMessage() const {
protobufs::Transformation result;
*result.mutable_equation_instruction() = message_;
return result;
}
uint32_t TransformationEquationInstruction::MaybeGetResultTypeId(
opt::IRContext* ir_context) const {
auto opcode = static_cast<spv::Op>(message_.opcode());
switch (opcode) {
case spv::Op::OpConvertUToF:
case spv::Op::OpConvertSToF: {
if (message_.in_operand_id_size() != 1) {
return 0;
}
const auto* type = ir_context->get_type_mgr()->GetType(
fuzzerutil::GetTypeId(ir_context, message_.in_operand_id(0)));
if (!type) {
return 0;
}
if (const auto* vector = type->AsVector()) {
if (!vector->element_type()->AsInteger()) {
return 0;
}
if (auto element_type_id = fuzzerutil::MaybeGetFloatType(
ir_context, vector->element_type()->AsInteger()->width())) {
return fuzzerutil::MaybeGetVectorType(ir_context, element_type_id,
vector->element_count());
}
return 0;
} else {
if (!type->AsInteger()) {
return 0;
}
return fuzzerutil::MaybeGetFloatType(ir_context,
type->AsInteger()->width());
}
}
case spv::Op::OpBitcast: {
if (message_.in_operand_id_size() != 1) {
return 0;
}
const auto* operand_inst =
ir_context->get_def_use_mgr()->GetDef(message_.in_operand_id(0));
if (!operand_inst) {
return 0;
}
const auto* operand_type =
ir_context->get_type_mgr()->GetType(operand_inst->type_id());
if (!operand_type) {
return 0;
}
// TODO(https://github.com/KhronosGroup/SPIRV-Tools/issues/3539):
// The only constraint on the types of OpBitcast's parameters is that
// they must have the same number of bits. Consider improving the code
// below to support this in full.
if (const auto* vector = operand_type->AsVector()) {
uint32_t component_type_id;
if (const auto* int_type = vector->element_type()->AsInteger()) {
component_type_id =
fuzzerutil::MaybeGetFloatType(ir_context, int_type->width());
} else if (const auto* float_type = vector->element_type()->AsFloat()) {
component_type_id = fuzzerutil::MaybeGetIntegerType(
ir_context, float_type->width(), true);
if (component_type_id == 0 ||
fuzzerutil::MaybeGetVectorType(ir_context, component_type_id,
vector->element_count()) == 0) {
component_type_id = fuzzerutil::MaybeGetIntegerType(
ir_context, float_type->width(), false);
}
} else {
assert(false && "Only vectors of numerical components are supported");
return 0;
}
if (component_type_id == 0) {
return 0;
}
return fuzzerutil::MaybeGetVectorType(ir_context, component_type_id,
vector->element_count());
} else if (const auto* int_type = operand_type->AsInteger()) {
return fuzzerutil::MaybeGetFloatType(ir_context, int_type->width());
} else if (const auto* float_type = operand_type->AsFloat()) {
if (auto existing_id = fuzzerutil::MaybeGetIntegerType(
ir_context, float_type->width(), true)) {
return existing_id;
}
return fuzzerutil::MaybeGetIntegerType(ir_context, float_type->width(),
false);
} else {
assert(false &&
"Operand is not a scalar or a vector of numerical type");
return 0;
}
}
case spv::Op::OpIAdd:
case spv::Op::OpISub: {
if (message_.in_operand_id_size() != 2) {
return 0;
}
uint32_t first_operand_width = 0;
uint32_t first_operand_type_id = 0;
for (uint32_t index = 0; index < 2; index++) {
auto operand_inst = ir_context->get_def_use_mgr()->GetDef(
message_.in_operand_id(index));
if (!operand_inst || !operand_inst->type_id()) {
return 0;
}
auto operand_type =
ir_context->get_type_mgr()->GetType(operand_inst->type_id());
if (!(operand_type->AsInteger() ||
(operand_type->AsVector() &&
operand_type->AsVector()->element_type()->AsInteger()))) {
return 0;
}
uint32_t operand_width =
operand_type->AsInteger()
? 1
: operand_type->AsVector()->element_count();
if (index == 0) {
first_operand_width = operand_width;
first_operand_type_id = operand_inst->type_id();
} else {
assert(first_operand_width != 0 &&
"The first operand should have been processed.");
if (operand_width != first_operand_width) {
return 0;
}
}
}
assert(first_operand_type_id != 0 &&
"A type must have been found for the first operand.");
return first_operand_type_id;
}
case spv::Op::OpLogicalNot: {
if (message_.in_operand_id().size() != 1) {
return 0;
}
auto operand_inst =
ir_context->get_def_use_mgr()->GetDef(message_.in_operand_id(0));
if (!operand_inst || !operand_inst->type_id()) {
return 0;
}
auto operand_type =
ir_context->get_type_mgr()->GetType(operand_inst->type_id());
if (!(operand_type->AsBool() ||
(operand_type->AsVector() &&
operand_type->AsVector()->element_type()->AsBool()))) {
return 0;
}
return operand_inst->type_id();
}
case spv::Op::OpSNegate: {
if (message_.in_operand_id().size() != 1) {
return 0;
}
auto operand_inst =
ir_context->get_def_use_mgr()->GetDef(message_.in_operand_id(0));
if (!operand_inst || !operand_inst->type_id()) {
return 0;
}
auto operand_type =
ir_context->get_type_mgr()->GetType(operand_inst->type_id());
if (!(operand_type->AsInteger() ||
(operand_type->AsVector() &&
operand_type->AsVector()->element_type()->AsInteger()))) {
return 0;
}
return operand_inst->type_id();
}
default:
assert(false && "Inappropriate opcode for equation instruction.");
return 0;
}
}
std::unordered_set<uint32_t> TransformationEquationInstruction::GetFreshIds()
const {
return {message_.fresh_id()};
}
} // namespace fuzz
} // namespace spvtools