Add special case bitcode support for DebugLoc. This avoids

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.

llvm-svn: 100261

1 files changed, 35 insertions, 9 deletions

diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
index 1f69e168516..9bda6dca3d5 100644
--- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -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();
 }