PTH: Have meta data be at the beginning of the PTH file, not the end.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64338 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Driver/CacheTokens.cpp b/Driver/CacheTokens.cpp
index d8a1fe1..6b9f96e 100644
--- a/Driver/CacheTokens.cpp
+++ b/Driver/CacheTokens.cpp
@@ -517,8 +517,10 @@
// Generate the prologue.
Out << "cfe-pth";
Emit32(PTHManager::Version);
- Offset JumpOffset = Out.tell();
- Emit32(0);
+
+ // Leave 4 words for the prologue.
+ Offset PrologueOffset = Out.tell();
+ for (unsigned i = 0; i < 4 * sizeof(uint32_t); ++i) Emit8(0);
// Iterate over all the files in SourceManager. Create a lexer
// for each file and cache the tokens.
@@ -554,16 +556,12 @@
// Write out the file table.
Offset FileTableOff = EmitFileTable();
- // Finally, write out the offset table at the end.
- Offset JumpTargetOffset = Out.tell();
+ // Finally, write the prologue.
+ Out.seek(PrologueOffset);
Emit32(IdTableOff.first);
Emit32(IdTableOff.second);
Emit32(FileTableOff);
Emit32(SpellingOff);
-
- // Now write the offset in the prologue.
- Out.seek(JumpOffset);
- Emit32(JumpTargetOffset);
}
void clang::CacheTokens(Preprocessor& PP, const std::string& OutFile) {