commit 4e4aa7053503a00c29fadaec82e2f399bc9da492
author Duncan P. N. Exon Smith <dexonsmith@apple.com> Tue Feb 03 21:54:14 2015 +0000
committer Duncan P. N. Exon Smith <dexonsmith@apple.com> Tue Feb 03 21:54:14 2015 +0000
tree d96c4bb1895e44a477fa4131e76d73bbbea3836d
parent 37cd4d0f42c31cc0c933069e528e65deaeb94477

IR: Assembly and bitcode for GenericDebugNode

llvm-svn: 228041

llvm/lib/Bitcode/Writer/BitcodeWriter.cpp

diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
index 2f1c74a..3aa1ef9 100644
--- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -792,10 +792,20 @@
   Record.clear();
 }
 
-static void WriteGenericDebugNode(const GenericDebugNode *,
-                                  const ValueEnumerator &, BitstreamWriter &,
-                                  SmallVectorImpl<uint64_t> &, unsigned) {
-  llvm_unreachable("unimplemented");
+static void WriteGenericDebugNode(const GenericDebugNode *N,
+                                  const ValueEnumerator &VE,
+                                  BitstreamWriter &Stream,
+                                  SmallVectorImpl<uint64_t> &Record,
+                                  unsigned Abbrev) {
+  Record.push_back(N->isDistinct());
+  Record.push_back(N->getTag());
+  Record.push_back(0); // Per-tag version field; unused for now.
+
+  for (auto &I : N->operands())
+    Record.push_back(VE.getMetadataOrNullID(I));
+
+  Stream.EmitRecord(bitc::METADATA_GENERIC_DEBUG, Record, Abbrev);
+  Record.clear();
 }
 
 static void WriteModuleMetadata(const Module *M,
@@ -833,6 +843,23 @@
     MDLocationAbbrev = Stream.EmitAbbrev(Abbv);
   }
 
+  unsigned GenericDebugNodeAbbrev = 0;
+  if (VE.hasGenericDebugNode()) {
+    // Abbrev for METADATA_GENERIC_DEBUG.
+    //
+    // Assume the column is usually under 128, and always output the inlined-at
+    // location (it's never more expensive than building an array size 1).
+    BitCodeAbbrev *Abbv = new BitCodeAbbrev();
+    Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_GENERIC_DEBUG));
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
+    Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
+    GenericDebugNodeAbbrev = Stream.EmitAbbrev(Abbv);
+  }
+
   unsigned NameAbbrev = 0;
   if (!M->named_metadata_empty()) {
     // Abbrev for METADATA_NAME.
@@ -844,7 +871,6 @@
   }
 
   unsigned MDTupleAbbrev = 0;
-  unsigned GenericDebugNodeAbbrev = 0;
   SmallVector<uint64_t, 64> Record;
   for (const Metadata *MD : MDs) {
     if (const MDNode *N = dyn_cast<MDNode>(MD)) {

llvm/lib/Bitcode/Writer/ValueEnumerator.cpp

diff --git a/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp b/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
index 2a7916b..24b077b 100644
--- a/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
+++ b/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
@@ -284,7 +284,7 @@
 }
 
 ValueEnumerator::ValueEnumerator(const Module &M)
-    : HasMDString(false), HasMDLocation(false) {
+    : HasMDString(false), HasMDLocation(false), HasGenericDebugNode(false) {
   if (shouldPreserveBitcodeUseListOrder())
     UseListOrders = predictUseListOrder(M);
 
@@ -544,6 +544,7 @@
 
   HasMDString |= isa<MDString>(MD);
   HasMDLocation |= isa<MDLocation>(MD);
+  HasGenericDebugNode |= isa<GenericDebugNode>(MD);
 
   // Replace the dummy ID inserted above with the correct one.  MDValueMap may
   // have changed by inserting operands, so we need a fresh lookup here.

llvm/lib/Bitcode/Writer/ValueEnumerator.h

diff --git a/llvm/lib/Bitcode/Writer/ValueEnumerator.h b/llvm/lib/Bitcode/Writer/ValueEnumerator.h
index 043c492..ab61584 100644
--- a/llvm/lib/Bitcode/Writer/ValueEnumerator.h
+++ b/llvm/lib/Bitcode/Writer/ValueEnumerator.h
@@ -66,6 +66,7 @@
   MetadataMapType MDValueMap;
   bool HasMDString;
   bool HasMDLocation;
+  bool HasGenericDebugNode;
 
   typedef DenseMap<AttributeSet, unsigned> AttributeGroupMapType;
   AttributeGroupMapType AttributeGroupMap;
@@ -120,6 +121,7 @@
 
   bool hasMDString() const { return HasMDString; }
   bool hasMDLocation() const { return HasMDLocation; }
+  bool hasGenericDebugNode() const { return HasGenericDebugNode; }
 
   unsigned getTypeID(Type *T) const {
     TypeMapType::const_iterator I = TypeMap.find(T);