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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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