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[lld-macho] Cache library paths from findLibrary 

On top of https://reviews.llvm.org/D113063 this took another 10 seconds
off our overall link time.

Reviewed By: #lld-macho, int3

Differential Revision: https://reviews.llvm.org/D113073
This commit is contained in:
Keith Smiley 2021-11-03 09:49:13 -07:00
parent 9904bcf2a4
commit f79e65e61f
1 changed files with 23 additions and 8 deletions
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31
lld/MachO/Driver.cpp
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@ -80,16 +80,30 @@ static HeaderFileType getOutputType(const InputArgList &args) {
}
}
static DenseMap<CachedHashStringRef, StringRef> resolvedLibraries;
static Optional<StringRef> findLibrary(StringRef name) {
if (config->searchDylibsFirst) {
if (Optional<StringRef> path = findPathCombination(
"lib" + name, config->librarySearchPaths, {".tbd", ".dylib"}))
return path;
CachedHashStringRef key(name);
auto entry = resolvedLibraries.find(key);
if (entry != resolvedLibraries.end())
return entry->second;
auto doFind = [&] {
if (config->searchDylibsFirst) {
if (Optional<StringRef> path = findPathCombination(
"lib" + name, config->librarySearchPaths, {".tbd", ".dylib"}))
return path;
return findPathCombination("lib" + name, config->librarySearchPaths,
{".a"});
}
return findPathCombination("lib" + name, config->librarySearchPaths,
{".a"});
}
return findPathCombination("lib" + name, config->librarySearchPaths,
{".tbd", ".dylib", ".a"});
{".tbd", ".dylib", ".a"});
};
Optional<StringRef> path = doFind();
if (path)
resolvedLibraries[key] = *path;
return path;
}
static Optional<StringRef> findFramework(StringRef name) {
@ -1076,6 +1090,7 @@ bool macho::link(ArrayRef<const char *> argsArr, bool canExitEarly,
errorHandler().cleanupCallback = []() {
freeArena();
resolvedLibraries.clear();
concatOutputSections.clear();
inputFiles.clear();
inputSections.clear();