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// Copyright (c) 2019 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_set_function_control.h"
namespace spvtools {
namespace fuzz {
TransformationSetFunctionControl::TransformationSetFunctionControl(
protobufs::TransformationSetFunctionControl message)
: message_(std::move(message)) {}
TransformationSetFunctionControl::TransformationSetFunctionControl(
uint32_t function_id, uint32_t function_control) {
message_.set_function_id(function_id);
message_.set_function_control(function_control);
}
bool TransformationSetFunctionControl::IsApplicable(
opt::IRContext* ir_context, const TransformationContext& /*unused*/) const {
opt::Instruction* function_def_instruction =
FindFunctionDefInstruction(ir_context);
if (!function_def_instruction) {
// The given function id does not correspond to any function.
return false;
}
uint32_t existing_function_control_mask =
function_def_instruction->GetSingleWordInOperand(0);
// Check (via an assertion) that function control mask doesn't have any bad
// bits set.
uint32_t acceptable_function_control_bits = uint32_t(
spv::FunctionControlMask::Inline | spv::FunctionControlMask::DontInline |
spv::FunctionControlMask::Pure | spv::FunctionControlMask::Const);
// The following is to keep release-mode compilers happy as this variable is
// only used in an assertion.
(void)(acceptable_function_control_bits);
assert(!(message_.function_control() & ~acceptable_function_control_bits) &&
"Nonsensical loop control bits were found.");
// Check (via an assertion) that function control mask does not have both
// Inline and DontInline bits set.
assert(!((message_.function_control() &
(uint32_t)spv::FunctionControlMask::Inline) &&
(message_.function_control() &
(uint32_t)spv::FunctionControlMask::DontInline)) &&
"It is not OK to set both the 'Inline' and 'DontInline' bits of a "
"function control mask");
// Check that Const and Pure are only present if they were present on the
// original function
for (auto mask_bit :
{spv::FunctionControlMask::Pure, spv::FunctionControlMask::Const}) {
if ((message_.function_control() & uint32_t(mask_bit)) &&
!(existing_function_control_mask & uint32_t(mask_bit))) {
return false;
}
}
return true;
}
void TransformationSetFunctionControl::Apply(
opt::IRContext* ir_context, TransformationContext* /*unused*/) const {
opt::Instruction* function_def_instruction =
FindFunctionDefInstruction(ir_context);
function_def_instruction->SetInOperand(0, {message_.function_control()});
}
protobufs::Transformation TransformationSetFunctionControl::ToMessage() const {
protobufs::Transformation result;
*result.mutable_set_function_control() = message_;
return result;
}
opt::Instruction* TransformationSetFunctionControl ::FindFunctionDefInstruction(
opt::IRContext* ir_context) const {
// Look through all functions for a function whose defining instruction's
// result id matches |message_.function_id|, returning the defining
// instruction if found.
for (auto& function : *ir_context->module()) {
if (function.DefInst().result_id() == message_.function_id()) {
return &function.DefInst();
}
}
// A nullptr result indicates that no match was found.
return nullptr;
}
std::unordered_set<uint32_t> TransformationSetFunctionControl::GetFreshIds()
const {
return std::unordered_set<uint32_t>();
}
} // namespace fuzz
} // namespace spvtools
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