1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
// 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/fuzzer_pass_adjust_function_controls.h"
#include "source/fuzz/transformation_set_function_control.h"
namespace spvtools {
namespace fuzz {
FuzzerPassAdjustFunctionControls::FuzzerPassAdjustFunctionControls(
opt::IRContext* ir_context, TransformationContext* transformation_context,
FuzzerContext* fuzzer_context,
protobufs::TransformationSequence* transformations,
bool ignore_inapplicable_transformations)
: FuzzerPass(ir_context, transformation_context, fuzzer_context,
transformations, ignore_inapplicable_transformations) {}
void FuzzerPassAdjustFunctionControls::Apply() {
// Consider every function in the module.
for (auto& function : *GetIRContext()->module()) {
// Randomly decide whether to adjust this function's controls.
if (GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()->GetChanceOfAdjustingFunctionControl())) {
// Grab the function control mask for the function in its present form.
uint32_t existing_function_control_mask =
function.DefInst().GetSingleWordInOperand(0);
// For the new mask, we first randomly select one of three basic masks:
// None, Inline or DontInline. These are always valid (and are mutually
// exclusive).
std::vector<spv::FunctionControlMask> basic_function_control_masks = {
spv::FunctionControlMask::MaskNone, spv::FunctionControlMask::Inline,
spv::FunctionControlMask::DontInline};
uint32_t new_function_control_mask =
uint32_t(basic_function_control_masks[GetFuzzerContext()->RandomIndex(
basic_function_control_masks)]);
// We now consider the Pure and Const mask bits. If these are already
// set on the function then it's OK to keep them, but also interesting
// to consider dropping them, so we decide randomly in each case.
for (auto mask_bit :
{spv::FunctionControlMask::Pure, spv::FunctionControlMask::Const}) {
if ((existing_function_control_mask & uint32_t(mask_bit)) &&
GetFuzzerContext()->ChooseEven()) {
new_function_control_mask |= uint32_t(mask_bit);
}
}
// Create and add a transformation.
TransformationSetFunctionControl transformation(
function.DefInst().result_id(), new_function_control_mask);
ApplyTransformation(transformation);
}
}
}
} // namespace fuzz
} // namespace spvtools
|
