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| /* | ||
| * This file is part of staq. | ||
| * | ||
| * Copyright (c) 2019 - 2023 softwareQ Inc. All rights reserved. | ||
| * | ||
| * MIT License | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| * of this software and associated documentation files (the "Software"), to deal | ||
| * in the Software without restriction, including without limitation the rights | ||
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| * copies of the Software, and to permit persons to whom the Software is | ||
| * furnished to do so, subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be included in | ||
| * all copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| * SOFTWARE. | ||
| */ | ||
|
|
||
| /** | ||
| * \file transformations/group_qregs.hpp | ||
| * \brief Group individual qregs into one global register. | ||
| */ | ||
|
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| /** | ||
| * The classes in this file transformations::LayoutTransformer and | ||
| * transformations::BasicLayout are slightly modified versions of | ||
| * mapping::LayoutTransformer and mapping::BasicLayout, as defined in | ||
| * mapping/layout/basic.hpp. | ||
| */ | ||
|
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| #ifndef TRANSFORMATIONS_GROUP_QREGS_HPP_ | ||
| #define TRANSFORMATIONS_GROUP_QREGS_HPP_ | ||
|
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| #include "qasmtools/ast/replacer.hpp" | ||
| #include "qasmtools/ast/traversal.hpp" | ||
| #include "transformations/substitution.hpp" | ||
|
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| namespace staq { | ||
| namespace transformations { | ||
|
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| namespace ast = qasmtools::ast; | ||
| namespace parser = qasmtools::parser; | ||
|
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| using layout = std::unordered_map<ast::VarAccess, int>; | ||
|
|
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| /** | ||
| * \class staq::transformations::LayoutTransformer | ||
| * \brief Applies a hardware layout to a circuit | ||
| * | ||
| * Accepts a layout -- that is, a mapping from variable | ||
| * accesses to addresses of physical qubits -- and rewrites | ||
| * the AST so that all variable accesses refer to the | ||
| * relevant address of a global register representing | ||
| * the physical qubits | ||
| */ | ||
| class LayoutTransformer final : public ast::Replacer { | ||
| public: | ||
| /** | ||
| * \class staq::mapping::LayoutTransformer::config | ||
| * \brief Holds configuration options | ||
| */ | ||
| struct config { | ||
| std::string register_name = "q"; | ||
| }; | ||
|
|
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| LayoutTransformer() = default; | ||
| LayoutTransformer(const config& params) : Replacer(), config_(params) {} | ||
| ~LayoutTransformer() = default; | ||
|
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| /** \brief Main transformation method */ | ||
| void run(ast::Program& prog, const layout& l) { | ||
| // Visit entire program, removing register declarations, then | ||
| // add the physical register & apply substitutions | ||
| prog.accept(*this); | ||
|
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| // Physical register declaration | ||
| prog.body().emplace_front( | ||
| std::make_unique<ast::RegisterDecl>(ast::RegisterDecl( | ||
| prog.pos(), config_.register_name, true, l.size()))); | ||
|
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| // Substitution | ||
| std::unordered_map<ast::VarAccess, ast::VarAccess> subst; | ||
| for (auto const& [access, idx] : l) { | ||
| subst.insert({access, ast::VarAccess(parser::Position(), | ||
| config_.register_name, idx)}); | ||
| } | ||
| transformations::subst_ap_ap(subst, prog); | ||
| } | ||
|
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| std::optional<std::list<ast::ptr<ast::Stmt>>> | ||
| replace(ast::RegisterDecl& decl) override { | ||
| if (decl.is_quantum()) | ||
| return std::list<ast::ptr<ast::Stmt>>(); | ||
| else | ||
| return std::nullopt; | ||
| } | ||
|
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| private: | ||
| config config_; | ||
| }; | ||
|
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| /** | ||
| * \class staq::transformations::BasicLayout | ||
| * \brief A simple layout generation algorithm | ||
| * | ||
| * Allocates physical qubits on a first-come, first-serve basis | ||
| */ | ||
| class BasicLayout final : public ast::Traverse { | ||
| public: | ||
| BasicLayout() : Traverse() {} | ||
| ~BasicLayout() = default; | ||
|
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| /** \brief Main generation method */ | ||
| layout generate(ast::Program& prog) { | ||
| current_ = layout(); | ||
| prog.accept(*this); | ||
| return current_; | ||
| } | ||
|
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| void visit(ast::RegisterDecl& decl) override { | ||
| if (decl.is_quantum()) { | ||
| for (auto i = 0; i < decl.size(); i++) { | ||
| current_[ast::VarAccess(parser::Position(), decl.id(), i)] = | ||
| static_cast<int>(current_.size()); | ||
| } | ||
| } | ||
| } | ||
|
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| private: | ||
| layout current_; | ||
| }; | ||
|
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| inline void group_qregs(ast::Program& prog) { | ||
| BasicLayout gen; | ||
| layout l = gen.generate(prog); | ||
| LayoutTransformer alg; | ||
| alg.run(prog, l); | ||
| } | ||
|
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| } // namespace transformations | ||
| } /* namespace staq */ | ||
|
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| #endif /* TRANSFORMATIONS_GROUP_QREGS_HPP_ */ |
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