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- /* Copyright (C) 2022 Free Software Foundation, Inc.
- This file is part of GDB.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- #include "gdbsupport/common-defs.h"
- #include "loongarch.h"
- #include <stdlib.h>
- #include <unordered_map>
- /* Target description features. */
- #include "../features/loongarch/base32.c"
- #include "../features/loongarch/base64.c"
- static target_desc_up
- loongarch_create_target_description (const struct loongarch_gdbarch_features features)
- {
- /* Now we should create a new target description. */
- target_desc_up tdesc = allocate_target_description ();
- std::string arch_name = "loongarch";
- if (features.xlen == 4)
- arch_name.append ("32");
- else if (features.xlen == 8)
- arch_name.append ("64");
- set_tdesc_architecture (tdesc.get (), arch_name.c_str ());
- long regnum = 0;
- /* For now we only support creating 32-bit or 64-bit x-registers. */
- if (features.xlen == 4)
- regnum = create_feature_loongarch_base32 (tdesc.get (), regnum);
- else if (features.xlen == 8)
- regnum = create_feature_loongarch_base64 (tdesc.get (), regnum);
- return tdesc;
- }
- /* Wrapper used by std::unordered_map to generate hash for feature set. */
- struct loongarch_gdbarch_features_hasher
- {
- std::size_t
- operator() (const loongarch_gdbarch_features &features) const noexcept
- {
- return features.hash ();
- }
- };
- /* Cache of previously seen target descriptions, indexed by the feature set
- that created them. */
- static std::unordered_map<loongarch_gdbarch_features,
- const target_desc_up,
- loongarch_gdbarch_features_hasher> loongarch_tdesc_cache;
- const target_desc *
- loongarch_lookup_target_description (const struct loongarch_gdbarch_features features)
- {
- /* Lookup in the cache. If we find it then return the pointer out of
- the target_desc_up (which is a unique_ptr). This is safe as the
- loongarch_tdesc_cache will exist until GDB exits. */
- const auto it = loongarch_tdesc_cache.find (features);
- if (it != loongarch_tdesc_cache.end ())
- return it->second.get ();
- target_desc_up tdesc (loongarch_create_target_description (features));
- /* Add to the cache, and return a pointer borrowed from the
- target_desc_up. This is safe as the cache (and the pointers
- contained within it) are not deleted until GDB exits. */
- target_desc *ptr = tdesc.get ();
- loongarch_tdesc_cache.emplace (features, std::move (tdesc));
- return ptr;
- }
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