PTH: Cache directory and negative 'stat' calls. This gives us a 1% performance improvement on Cocoa.h (fsyntax-only+PTH).
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64490 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/PTHLexer.cpp b/lib/Lex/PTHLexer.cpp
index 12fe829..ac510af 100644
--- a/lib/Lex/PTHLexer.cpp
+++ b/lib/Lex/PTHLexer.cpp
@@ -808,15 +808,17 @@
static data_type ReadData(const internal_key_type& k, const unsigned char* d,
unsigned) {
- if (k.first == 0x1 /* File */) {
- d += 4 * 2; // Skip the first 2 words.
+
+ if (k.first /* File or Directory */) {
+ if (k.first == 0x1 /* File */) d += 4 * 2; // Skip the first 2 words.
ino_t ino = (ino_t) ReadUnalignedLE32(d);
dev_t dev = (dev_t) ReadUnalignedLE32(d);
mode_t mode = (mode_t) ReadUnalignedLE16(d);
time_t mtime = (time_t) ReadUnalignedLE64(d);
return data_type(ino, dev, mode, mtime, (off_t) ReadUnalignedLE64(d));
}
-
+
+ // Negative stat. Don't read anything.
return data_type();
}
};
@@ -841,6 +843,10 @@
if (I == Cache.end()) return ::stat(path, buf);
const PTHStatData& Data = *I;
+
+ if (!Data.hasStat)
+ return 1;
+
buf->st_ino = Data.ino;
buf->st_dev = Data.dev;
buf->st_mtime = Data.mtime;