jkorous added a comment.
IIUC the issue is that `SourceManager::translateFile()` basically consists of
two blocks of code:
// First, check the main file ID, since it is common to look for a
// location in the main file.
if (MainFileID.isValid()) {
bool Invalid = false;
const SLocEntry &MainSLoc = getSLocEntry(MainFileID, &Invalid);
if (Invalid)
return FileID();
if (MainSLoc.isFile()) {
const ContentCache *MainContentCache =
MainSLoc.getFile().getContentCache();
if (MainContentCache && MainContentCache->OrigEntry == SourceFile)
return MainFileID;
}
}
and
// The location we're looking for isn't in the main file; look
// through all of the local source locations.
...
The comments suggest that the first block is a heuristic related to our case
and the second block I would assume being the expensive part.
`SourceManager::getFileEntryRefForID` implementation seems similar to the first
block.
It makes sense to me to avoid the expensive search. I'm just wondering - how
much speedup do we get with caching the value?
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D79834/new/
https://reviews.llvm.org/D79834
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