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Add special case bitcode support for DebugLoc. This avoids

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having the bitcode writer materialize mdnodes for all the
debug location tuples when writing out the bc file and 
stores the information in a more compact form.  For example,
the -O0 -g bc file for combine.c in 176.gcc shrinks from
739392 to 512096 bytes.

This concludes my planned short-term debug info work.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100261 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-04-03 02:17:50 +00:00
parent cbf1aa9e31
commit a6245247e9
5 changed files with 91 additions and 13 deletions
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44
lib/Bitcode/Writer/BitcodeWriter.cpp
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@@ -596,7 +596,8 @@ static void WriteFunctionLocalMetadata(const Function &F,
static void WriteMetadataAttachment(const Function &F,
const ValueEnumerator &VE,
BitstreamWriter &Stream) {
bool StartedMetadataBlock = false;
Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3);
SmallVector<uint64_t, 64> Record;
// Write metadata attachments
@@ -607,7 +608,7 @@ static void WriteMetadataAttachment(const Function &F,
for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
I != E; ++I) {
MDs.clear();
I->getAllMetadata(MDs);
I->getAllMetadataOtherThanDebugLoc(MDs);
// If no metadata, ignore instruction.
if (MDs.empty()) continue;
@@ -618,16 +619,11 @@ static void WriteMetadataAttachment(const Function &F,
Record.push_back(MDs[i].first);
Record.push_back(VE.getValueID(MDs[i].second));
}
if (!StartedMetadataBlock) {
Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3);
StartedMetadataBlock = true;
}
Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
Record.clear();
}
if (StartedMetadataBlock)
Stream.ExitBlock();
Stream.ExitBlock();
}
static void WriteModuleMetadataStore(const Module *M, BitstreamWriter &Stream) {
@@ -1256,19 +1252,49 @@ static void WriteFunction(const Function &F, ValueEnumerator &VE,
// Keep a running idea of what the instruction ID is.
unsigned InstID = CstEnd;
bool NeedsMetadataAttachment = false;
DebugLoc LastDL;
// Finally, emit all the instructions, in order.
for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
I != E; ++I) {
WriteInstruction(*I, InstID, VE, Stream, Vals);
if (!I->getType()->isVoidTy())
++InstID;
// If the instruction has metadata, write a metadata attachment later.
NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc();
// If the instruction has a debug location, emit it.
DebugLoc DL = I->getDebugLoc();
if (DL.isUnknown()) {
// nothing todo.
} else if (DL == LastDL) {
// Just repeat the same debug loc as last time.
Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals);
} else {
MDNode *Scope, *IA;
DL.getScopeAndInlinedAt(Scope, IA, I->getContext());
Vals.push_back(DL.getLine());
Vals.push_back(DL.getCol());
Vals.push_back(Scope ? VE.getValueID(Scope)+1 : 0);
Vals.push_back(IA ? VE.getValueID(IA)+1 : 0);
Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals);
Vals.clear();
LastDL = DL;
}
}
// Emit names for all the instructions etc.
WriteValueSymbolTable(F.getValueSymbolTable(), VE, Stream);
WriteMetadataAttachment(F, VE, Stream);
if (NeedsMetadataAttachment)
WriteMetadataAttachment(F, VE, Stream);
VE.purgeFunction();
Stream.ExitBlock();
}