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Add a version field in the bitcode for the summary

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Differential Revision: http://reviews.llvm.org/D19456

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 267318
This commit is contained in:
Mehdi Amini
2016-04-24 03:18:11 +00:00
parent 059464fe36
commit 8fe6936e18
11 changed files with 46 additions and 1 deletions
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8
llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
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@@ -3067,6 +3067,11 @@ void ModuleBitcodeWriter::writeModuleLevelReferences(
NameVals.clear();
}
// Current version for the summary.
// This is bumped whenever we introduce changes in the way some record are
// interpreted, like flags for instance.
static const uint64_t INDEX_VERSION = 1;
/// Emit the per-module summary section alongside the rest of
/// the module's bitcode.
void ModuleBitcodeWriter::writePerModuleGlobalValueSummary() {
@@ -3078,6 +3083,8 @@ void ModuleBitcodeWriter::writePerModuleGlobalValueSummary() {
Stream.EnterSubblock(bitc::GLOBALVAL_SUMMARY_BLOCK_ID, 3);
Stream.EmitRecord(bitc::FS_VERSION, ArrayRef<uint64_t>{INDEX_VERSION});
// Abbrev for FS_PERMODULE.
BitCodeAbbrev *Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(bitc::FS_PERMODULE));
@@ -3162,6 +3169,7 @@ void ModuleBitcodeWriter::writePerModuleGlobalValueSummary() {
/// Emit the combined summary section into the combined index file.
void IndexBitcodeWriter::writeCombinedGlobalValueSummary() {
Stream.EnterSubblock(bitc::GLOBALVAL_SUMMARY_BLOCK_ID, 3);
Stream.EmitRecord(bitc::FS_VERSION, ArrayRef<uint64_t>{INDEX_VERSION});
// Abbrev for FS_COMBINED.
BitCodeAbbrev *Abbv = new BitCodeAbbrev();