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Liberty file caching with new libcache command

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This adds optional in-memory caching of parsed liberty files to speed up
flows that repeatedly parse the same liberty files. To avoid increasing
the memory overhead by default, the caching is disabled by default. The
caching can be controlled globally or on a per path basis using the new
`libcache` command, which also allows purging cached data.
This commit is contained in:
Jannis Harder 2025-04-03 13:11:48 +02:00
parent 26a4b9b0c6
commit 0f13b55173
9 changed files with 253 additions and 17 deletions
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25
passes/techmap/libparse.cc
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@ -32,6 +32,31 @@
using namespace Yosys;
#ifndef FILTERLIB
LibertyAstCache LibertyAstCache::instance;
std::shared_ptr<const LibertyAst> LibertyAstCache::cached_ast(const std::string &fname)
{
auto it = cached.find(fname);
if (it == cached.end())
return nullptr;
log("Using cached data for liberty file `%s'\n", fname.c_str());
return it->second;
}
void LibertyAstCache::parsed_ast(const std::string &fname, const std::shared_ptr<const LibertyAst> &ast)
{
auto it = cache_path.find(fname);
bool should_cache = it == cache_path.end() ? cache_by_default : it->second;
if (!should_cache)
return;
log("Caching data for liberty file `%s'\n", fname.c_str());
cached.emplace(fname, ast);
}
#endif
bool LibertyInputStream::extend_buffer_once()
{
if (eof)