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Prevents UB for divide-by-zero and integer overflow when dividing Fixed: tint:1349 Change-Id: Ieef66d27d7aec3011628ced076b2bccc7770a8af Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/108925 Commit-Queue: Ben Clayton <bclayton@google.com> Reviewed-by: Dan Sinclair <dsinclair@chromium.org> Kokoro: Kokoro <noreply+kokoro@google.com>
107 lines
3.8 KiB
C++
107 lines
3.8 KiB
C++
// Copyright 2022 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SRC_TINT_TRANSFORM_BUILTIN_POLYFILL_H_
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#define SRC_TINT_TRANSFORM_BUILTIN_POLYFILL_H_
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#include "src/tint/transform/transform.h"
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namespace tint::transform {
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/// Implements builtins for backends that do not have a native implementation.
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class BuiltinPolyfill final : public Castable<BuiltinPolyfill, Transform> {
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public:
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/// Constructor
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BuiltinPolyfill();
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/// Destructor
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~BuiltinPolyfill() override;
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/// Enumerator of polyfill levels
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enum class Level {
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/// No polyfill needed, supported by the backend.
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kNone,
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/// Clamp the parameters to the inner implementation.
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kClampParameters,
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/// Range check the input.
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kRangeCheck,
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/// Polyfill the entire function
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kFull,
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};
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/// Specifies the builtins that should be polyfilled by the transform.
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struct Builtins {
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/// What level should `acosh` be polyfilled?
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Level acosh = Level::kNone;
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/// Should `asinh` be polyfilled?
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bool asinh = false;
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/// What level should `atanh` be polyfilled?
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Level atanh = Level::kNone;
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/// Should the RHS of `<<` and `>>` be wrapped in a modulo bit-width of LHS?
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bool bitshift_modulo = false;
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/// Should `clamp()` be polyfilled for integer values (scalar or vector)?
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bool clamp_int = false;
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/// Should `countLeadingZeros()` be polyfilled?
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bool count_leading_zeros = false;
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/// Should `countTrailingZeros()` be polyfilled?
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bool count_trailing_zeros = false;
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/// What level should `extractBits()` be polyfilled?
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Level extract_bits = Level::kNone;
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/// Should `firstLeadingBit()` be polyfilled?
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bool first_leading_bit = false;
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/// Should `firstTrailingBit()` be polyfilled?
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bool first_trailing_bit = false;
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/// Should `insertBits()` be polyfilled?
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Level insert_bits = Level::kNone;
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/// Should integer scalar / vector divides and modulos be polyfilled to avoid DBZ and
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/// integer overflows?
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bool int_div_mod = false;
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/// Should `saturate()` be polyfilled?
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bool saturate = false;
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/// Should `textureSampleBaseClampToEdge()` be polyfilled for texture_2d<f32> textures?
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bool texture_sample_base_clamp_to_edge_2d_f32 = false;
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/// Should the vector form of `quantizeToF16()` be polyfilled with a scalar implementation?
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/// See crbug.com/tint/1741
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bool quantize_to_vec_f16 = false;
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};
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/// Config is consumed by the BuiltinPolyfill transform.
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/// Config specifies the builtins that should be polyfilled.
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struct Config final : public Castable<Data, transform::Data> {
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/// Constructor
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/// @param b the list of builtins to polyfill
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explicit Config(const Builtins& b);
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/// Copy constructor
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Config(const Config&);
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/// Destructor
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~Config() override;
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/// The builtins to polyfill
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const Builtins builtins;
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};
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/// @copydoc Transform::Apply
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ApplyResult Apply(const Program* program,
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const DataMap& inputs,
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DataMap& outputs) const override;
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private:
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struct State;
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};
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} // namespace tint::transform
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#endif // SRC_TINT_TRANSFORM_BUILTIN_POLYFILL_H_
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