Store unique IDs for identifiers in the PCH file. Use some bitmangling
so that we only need to perform the lookup and identifier resolution
once per identifier in the PCH file.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68846 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/PCHReader.cpp b/lib/Frontend/PCHReader.cpp
index 345e673..b21beed 100644
--- a/lib/Frontend/PCHReader.cpp
+++ b/lib/Frontend/PCHReader.cpp
@@ -477,7 +477,7 @@
return IgnorePCH;
break;
- case pch::TARGET_TRIPLE:
+ case pch::TARGET_TRIPLE: {
std::string TargetTriple(BlobStart, BlobLen);
if (TargetTriple != Context.Target.getTargetTriple()) {
Diag(diag::warn_pch_target_triple)
@@ -487,6 +487,27 @@
}
break;
}
+
+ case pch::IDENTIFIER_TABLE:
+ IdentifierTable = BlobStart;
+ break;
+
+ case pch::IDENTIFIER_OFFSET:
+ if (!IdentifierData.empty()) {
+ Error("Duplicate IDENTIFIER_OFFSET record in PCH file");
+ return Failure;
+ }
+ IdentifierData.swap(Record);
+#ifndef NDEBUG
+ for (unsigned I = 0, N = IdentifierData.size(); I != N; ++I) {
+ if ((IdentifierData[I] & 0x01) == 0) {
+ Error("Malformed identifier table in the precompiled header");
+ return Failure;
+ }
+ }
+#endif
+ break;
+ }
}
Error("Premature end of bitstream");
@@ -927,13 +948,22 @@
const IdentifierInfo *PCHReader::GetIdentifierInfo(const RecordData &Record,
unsigned &Idx) {
- // FIXME: we need unique IDs for identifiers.
- std::string Str;
- unsigned Length = Record[Idx++];
- Str.resize(Length);
- for (unsigned I = 0; I != Length; ++I)
- Str[I] = Record[Idx++];
- return &Context.Idents.get(Str);
+ pch::IdentID ID = Record[Idx++];
+ if (ID == 0)
+ return 0;
+
+ if (!IdentifierTable || IdentifierData.empty()) {
+ Error("No identifier table in PCH file");
+ return 0;
+ }
+
+ if (IdentifierData[ID - 1] & 0x01) {
+ uint64_t Offset = IdentifierData[ID - 1];
+ IdentifierData[ID - 1] = reinterpret_cast<uint64_t>(
+ &Context.Idents.get(IdentifierTable + Offset));
+ }
+
+ return reinterpret_cast<const IdentifierInfo *>(IdentifierData[ID - 1]);
}
DeclarationName