mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-11-26 21:30:07 +00:00
97 lines
3.7 KiB
C++
97 lines
3.7 KiB
C++
// 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/fuzzer_pass_add_loads.h"
|
|
|
|
#include "source/fuzz/fuzzer_util.h"
|
|
#include "source/fuzz/transformation_load.h"
|
|
|
|
namespace spvtools {
|
|
namespace fuzz {
|
|
|
|
FuzzerPassAddLoads::FuzzerPassAddLoads(
|
|
opt::IRContext* ir_context, TransformationContext* transformation_context,
|
|
FuzzerContext* fuzzer_context,
|
|
protobufs::TransformationSequence* transformations)
|
|
: FuzzerPass(ir_context, transformation_context, fuzzer_context,
|
|
transformations) {}
|
|
|
|
FuzzerPassAddLoads::~FuzzerPassAddLoads() = default;
|
|
|
|
void FuzzerPassAddLoads::Apply() {
|
|
ForEachInstructionWithInstructionDescriptor(
|
|
[this](opt::Function* function, opt::BasicBlock* block,
|
|
opt::BasicBlock::iterator inst_it,
|
|
const protobufs::InstructionDescriptor& instruction_descriptor)
|
|
-> void {
|
|
assert(inst_it->opcode() ==
|
|
instruction_descriptor.target_instruction_opcode() &&
|
|
"The opcode of the instruction we might insert before must be "
|
|
"the same as the opcode in the descriptor for the instruction");
|
|
|
|
// Check whether it is legitimate to insert a load before this
|
|
// instruction.
|
|
if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(SpvOpLoad, inst_it)) {
|
|
return;
|
|
}
|
|
|
|
// Randomly decide whether to try inserting a load here.
|
|
if (!GetFuzzerContext()->ChoosePercentage(
|
|
GetFuzzerContext()->GetChanceOfAddingLoad())) {
|
|
return;
|
|
}
|
|
|
|
std::vector<opt::Instruction*> relevant_instructions =
|
|
FindAvailableInstructions(
|
|
function, block, inst_it,
|
|
[](opt::IRContext* context,
|
|
opt::Instruction* instruction) -> bool {
|
|
if (!instruction->result_id() || !instruction->type_id()) {
|
|
return false;
|
|
}
|
|
switch (instruction->opcode()) {
|
|
case SpvOpConstantNull:
|
|
case SpvOpUndef:
|
|
// Do not allow loading from a null or undefined pointer;
|
|
// this might be OK if the block is dead, but for now we
|
|
// conservatively avoid it.
|
|
return false;
|
|
default:
|
|
break;
|
|
}
|
|
return context->get_def_use_mgr()
|
|
->GetDef(instruction->type_id())
|
|
->opcode() == SpvOpTypePointer;
|
|
});
|
|
|
|
// At this point, |relevant_instructions| contains all the pointers
|
|
// we might think of loading from.
|
|
if (relevant_instructions.empty()) {
|
|
return;
|
|
}
|
|
|
|
// Choose a pointer at random, and create and apply a loading
|
|
// transformation based on it.
|
|
ApplyTransformation(TransformationLoad(
|
|
GetFuzzerContext()->GetFreshId(),
|
|
relevant_instructions[GetFuzzerContext()->RandomIndex(
|
|
relevant_instructions)]
|
|
->result_id(),
|
|
instruction_descriptor));
|
|
});
|
|
}
|
|
|
|
} // namespace fuzz
|
|
} // namespace spvtools
|