mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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89 lines
3.6 KiB
C++
89 lines
3.6 KiB
C++
// Copyright (c) 2016 Google Inc.
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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 LIBSPIRV_OPT_SET_SPEC_CONSTANT_DEFAULT_VALUE_PASS_H_
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#define LIBSPIRV_OPT_SET_SPEC_CONSTANT_DEFAULT_VALUE_PASS_H_
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#include <memory>
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#include <string>
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#include <unordered_map>
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#include "module.h"
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#include "pass.h"
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namespace spvtools {
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namespace opt {
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// See optimizer.hpp for documentation.
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class SetSpecConstantDefaultValuePass : public Pass {
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public:
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using SpecIdToValueStrMap = std::unordered_map<uint32_t, std::string>;
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using SpecIdToInstMap = std::unordered_map<uint32_t, ir::Instruction*>;
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// Constructs a pass instance with a map from spec ids to default values.
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explicit SetSpecConstantDefaultValuePass(
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const SpecIdToValueStrMap& default_values)
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: spec_id_to_value_(default_values) {}
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explicit SetSpecConstantDefaultValuePass(SpecIdToValueStrMap&& default_values)
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: spec_id_to_value_(std::move(default_values)) {}
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const char* name() const override { return "set-spec-const-default-value"; }
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Status Process(ir::Module*) override;
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// Parses the given null-terminated C string to get a mapping from Spec Id to
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// default value strings. Returns a unique pointer of the mapping from spec
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// ids to spec constant default value strings built from the given |str| on
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// success. Returns a nullptr if the given string is not valid for building
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// the mapping.
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// A valid string for building the mapping should follow the rule below:
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//
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// "<spec id A>:<default value for A> <spec id B>:<default value for B> ..."
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// Example:
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// "200:0x11 201:3.14 202:1.4728"
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//
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// Entries are separated with blank spaces (i.e.:' ', '\n', '\r', '\t',
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// '\f', '\v'). Each entry corresponds to a Spec Id and default value pair.
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// Multiple spaces between, before or after entries are allowed. However,
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// spaces are not allowed within spec id or the default value string because
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// spaces are always considered as delimiter to separate entries.
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//
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// In each entry, the spec id and value string is separated by ':'. Missing
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// ':' in any entry is invalid. And it is invalid to have blank spaces in
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// between the spec id and ':' or the default value and ':'.
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//
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// <spec id>: specifies the spec id value.
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// The text must represent a valid uint32_t number.
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// Hex format with '0x' prefix is allowed.
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// Empty <spec id> is not allowed.
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// One spec id value can only be defined once, multiple default values
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// defined for the same spec id is not allowed. Spec ids with same value
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// but different formats (e.g. 0x100 and 256) are considered the same.
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//
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// <default value>: the default value string.
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// Spaces before and after default value text is allowed.
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// Spaces within the text is not allowed.
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// Empty <default value> is not allowed.
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static std::unique_ptr<SpecIdToValueStrMap> ParseDefaultValuesString(
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const char* str);
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private:
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// The mapping from spec ids to their default values to be set.
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const SpecIdToValueStrMap spec_id_to_value_;
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};
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} // namespace opt
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} // namespace spvtools
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#endif // LIBSPIRV_OPT_SET_SPEC_CONSTANT_DEFAULT_VALUE_PASS_H_
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