IR: Give 'DI' prefix to debug info metadata

Finish off PR23080 by renaming the debug info IR constructs from `MD*`
to `DI*`.  The last of the `DIDescriptor` classes were deleted in
r235356, and the last of the related typedefs removed in r235413, so
this has all baked for about a week.

Note: If you have out-of-tree code (like a frontend), I recommend that
you get everything compiling and tests passing with the *previous*
commit before updating to this one.  It'll be easier to keep track of
what code is using the `DIDescriptor` hierarchy and what you've already
updated, and I think you're extremely unlikely to insert bugs.  YMMV of
course.

Back to *this* commit: I did this using the rename-md-di-nodes.sh
upgrade script I've attached to PR23080 (both code and testcases) and
filtered through clang-format-diff.py.  I edited the tests for
test/Assembler/invalid-generic-debug-node-*.ll by hand since the columns
were off-by-three.  It should work on your out-of-tree testcases (and
code, if you've followed the advice in the previous paragraph).

Some of the tests are in badly named files now (e.g.,
test/Assembler/invalid-mdcompositetype-missing-tag.ll should be
'dicompositetype'); I'll come back and move the files in a follow-up
commit.

llvm-svn: 236120
diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
index 15b0106..85a6da3 100644
--- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -784,7 +784,7 @@
   Record.clear();
 }
 
-static void WriteMDLocation(const MDLocation *N, const ValueEnumerator &VE,
+static void WriteDILocation(const DILocation *N, const ValueEnumerator &VE,
                             BitstreamWriter &Stream,
                             SmallVectorImpl<uint64_t> &Record,
                             unsigned Abbrev) {
@@ -798,11 +798,11 @@
   Record.clear();
 }
 
-static void WriteGenericDebugNode(const GenericDebugNode *N,
-                                  const ValueEnumerator &VE,
-                                  BitstreamWriter &Stream,
-                                  SmallVectorImpl<uint64_t> &Record,
-                                  unsigned Abbrev) {
+static void WriteGenericDINode(const GenericDINode *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.
@@ -819,7 +819,7 @@
   return I < 0 ? ~(U << 1) : U << 1;
 }
 
-static void WriteMDSubrange(const MDSubrange *N, const ValueEnumerator &,
+static void WriteDISubrange(const DISubrange *N, const ValueEnumerator &,
                             BitstreamWriter &Stream,
                             SmallVectorImpl<uint64_t> &Record,
                             unsigned Abbrev) {
@@ -831,7 +831,7 @@
   Record.clear();
 }
 
-static void WriteMDEnumerator(const MDEnumerator *N, const ValueEnumerator &VE,
+static void WriteDIEnumerator(const DIEnumerator *N, const ValueEnumerator &VE,
                               BitstreamWriter &Stream,
                               SmallVectorImpl<uint64_t> &Record,
                               unsigned Abbrev) {
@@ -843,7 +843,7 @@
   Record.clear();
 }
 
-static void WriteMDBasicType(const MDBasicType *N, const ValueEnumerator &VE,
+static void WriteDIBasicType(const DIBasicType *N, const ValueEnumerator &VE,
                              BitstreamWriter &Stream,
                              SmallVectorImpl<uint64_t> &Record,
                              unsigned Abbrev) {
@@ -858,7 +858,7 @@
   Record.clear();
 }
 
-static void WriteMDDerivedType(const MDDerivedType *N,
+static void WriteDIDerivedType(const DIDerivedType *N,
                                const ValueEnumerator &VE,
                                BitstreamWriter &Stream,
                                SmallVectorImpl<uint64_t> &Record,
@@ -880,7 +880,7 @@
   Record.clear();
 }
 
-static void WriteMDCompositeType(const MDCompositeType *N,
+static void WriteDICompositeType(const DICompositeType *N,
                                  const ValueEnumerator &VE,
                                  BitstreamWriter &Stream,
                                  SmallVectorImpl<uint64_t> &Record,
@@ -906,7 +906,7 @@
   Record.clear();
 }
 
-static void WriteMDSubroutineType(const MDSubroutineType *N,
+static void WriteDISubroutineType(const DISubroutineType *N,
                                   const ValueEnumerator &VE,
                                   BitstreamWriter &Stream,
                                   SmallVectorImpl<uint64_t> &Record,
@@ -919,7 +919,7 @@
   Record.clear();
 }
 
-static void WriteMDFile(const MDFile *N, const ValueEnumerator &VE,
+static void WriteDIFile(const DIFile *N, const ValueEnumerator &VE,
                         BitstreamWriter &Stream,
                         SmallVectorImpl<uint64_t> &Record, unsigned Abbrev) {
   Record.push_back(N->isDistinct());
@@ -930,7 +930,7 @@
   Record.clear();
 }
 
-static void WriteMDCompileUnit(const MDCompileUnit *N,
+static void WriteDICompileUnit(const DICompileUnit *N,
                                const ValueEnumerator &VE,
                                BitstreamWriter &Stream,
                                SmallVectorImpl<uint64_t> &Record,
@@ -954,11 +954,10 @@
   Record.clear();
 }
 
-static void WriteMDSubprogram(const MDSubprogram *N,
-                               const ValueEnumerator &VE,
-                               BitstreamWriter &Stream,
-                               SmallVectorImpl<uint64_t> &Record,
-                               unsigned Abbrev) {
+static void WriteDISubprogram(const DISubprogram *N, const ValueEnumerator &VE,
+                              BitstreamWriter &Stream,
+                              SmallVectorImpl<uint64_t> &Record,
+                              unsigned Abbrev) {
   Record.push_back(N->isDistinct());
   Record.push_back(VE.getMetadataOrNullID(N->getScope()));
   Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
@@ -983,11 +982,11 @@
   Record.clear();
 }
 
-static void WriteMDLexicalBlock(const MDLexicalBlock *N,
-                               const ValueEnumerator &VE,
-                               BitstreamWriter &Stream,
-                               SmallVectorImpl<uint64_t> &Record,
-                               unsigned Abbrev) {
+static void WriteDILexicalBlock(const DILexicalBlock *N,
+                                const ValueEnumerator &VE,
+                                BitstreamWriter &Stream,
+                                SmallVectorImpl<uint64_t> &Record,
+                                unsigned Abbrev) {
   Record.push_back(N->isDistinct());
   Record.push_back(VE.getMetadataOrNullID(N->getScope()));
   Record.push_back(VE.getMetadataOrNullID(N->getFile()));
@@ -998,7 +997,7 @@
   Record.clear();
 }
 
-static void WriteMDLexicalBlockFile(const MDLexicalBlockFile *N,
+static void WriteDILexicalBlockFile(const DILexicalBlockFile *N,
                                     const ValueEnumerator &VE,
                                     BitstreamWriter &Stream,
                                     SmallVectorImpl<uint64_t> &Record,
@@ -1012,7 +1011,7 @@
   Record.clear();
 }
 
-static void WriteMDNamespace(const MDNamespace *N, const ValueEnumerator &VE,
+static void WriteDINamespace(const DINamespace *N, const ValueEnumerator &VE,
                              BitstreamWriter &Stream,
                              SmallVectorImpl<uint64_t> &Record,
                              unsigned Abbrev) {
@@ -1026,7 +1025,7 @@
   Record.clear();
 }
 
-static void WriteMDTemplateTypeParameter(const MDTemplateTypeParameter *N,
+static void WriteDITemplateTypeParameter(const DITemplateTypeParameter *N,
                                          const ValueEnumerator &VE,
                                          BitstreamWriter &Stream,
                                          SmallVectorImpl<uint64_t> &Record,
@@ -1039,7 +1038,7 @@
   Record.clear();
 }
 
-static void WriteMDTemplateValueParameter(const MDTemplateValueParameter *N,
+static void WriteDITemplateValueParameter(const DITemplateValueParameter *N,
                                           const ValueEnumerator &VE,
                                           BitstreamWriter &Stream,
                                           SmallVectorImpl<uint64_t> &Record,
@@ -1054,7 +1053,7 @@
   Record.clear();
 }
 
-static void WriteMDGlobalVariable(const MDGlobalVariable *N,
+static void WriteDIGlobalVariable(const DIGlobalVariable *N,
                                   const ValueEnumerator &VE,
                                   BitstreamWriter &Stream,
                                   SmallVectorImpl<uint64_t> &Record,
@@ -1075,7 +1074,7 @@
   Record.clear();
 }
 
-static void WriteMDLocalVariable(const MDLocalVariable *N,
+static void WriteDILocalVariable(const DILocalVariable *N,
                                  const ValueEnumerator &VE,
                                  BitstreamWriter &Stream,
                                  SmallVectorImpl<uint64_t> &Record,
@@ -1094,7 +1093,7 @@
   Record.clear();
 }
 
-static void WriteMDExpression(const MDExpression *N, const ValueEnumerator &,
+static void WriteDIExpression(const DIExpression *N, const ValueEnumerator &,
                               BitstreamWriter &Stream,
                               SmallVectorImpl<uint64_t> &Record,
                               unsigned Abbrev) {
@@ -1107,11 +1106,11 @@
   Record.clear();
 }
 
-static void WriteMDObjCProperty(const MDObjCProperty *N,
-                                 const ValueEnumerator &VE,
-                                 BitstreamWriter &Stream,
-                                 SmallVectorImpl<uint64_t> &Record,
-                                 unsigned Abbrev) {
+static void WriteDIObjCProperty(const DIObjCProperty *N,
+                                const ValueEnumerator &VE,
+                                BitstreamWriter &Stream,
+                                SmallVectorImpl<uint64_t> &Record,
+                                unsigned Abbrev) {
   Record.push_back(N->isDistinct());
   Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
   Record.push_back(VE.getMetadataOrNullID(N->getFile()));
@@ -1125,7 +1124,7 @@
   Record.clear();
 }
 
-static void WriteMDImportedEntity(const MDImportedEntity *N,
+static void WriteDIImportedEntity(const DIImportedEntity *N,
                                   const ValueEnumerator &VE,
                                   BitstreamWriter &Stream,
                                   SmallVectorImpl<uint64_t> &Record,
@@ -1164,7 +1163,7 @@
 #define HANDLE_MDNODE_LEAF(CLASS) unsigned CLASS##Abbrev = 0;
 #include "llvm/IR/Metadata.def"
 
-  if (VE.hasMDLocation()) {
+  if (VE.hasDILocation()) {
     // Abbrev for METADATA_LOCATION.
     //
     // Assume the column is usually under 128, and always output the inlined-at
@@ -1176,10 +1175,10 @@
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
-    MDLocationAbbrev = Stream.EmitAbbrev(Abbv);
+    DILocationAbbrev = Stream.EmitAbbrev(Abbv);
   }
 
-  if (VE.hasGenericDebugNode()) {
+  if (VE.hasGenericDINode()) {
     // Abbrev for METADATA_GENERIC_DEBUG.
     //
     // Assume the column is usually under 128, and always output the inlined-at
@@ -1192,7 +1191,7 @@
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
-    GenericDebugNodeAbbrev = Stream.EmitAbbrev(Abbv);
+    GenericDINodeAbbrev = Stream.EmitAbbrev(Abbv);
   }
 
   unsigned NameAbbrev = 0;
@@ -2105,7 +2104,7 @@
 
   bool NeedsMetadataAttachment = F.hasMetadata();
 
-  MDLocation *LastDL = nullptr;
+  DILocation *LastDL = nullptr;
 
   // Finally, emit all the instructions, in order.
   for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
@@ -2120,7 +2119,7 @@
       NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc();
 
       // If the instruction has a debug location, emit it.
-      MDLocation *DL = I->getDebugLoc();
+      DILocation *DL = I->getDebugLoc();
       if (!DL)
         continue;
 
diff --git a/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp b/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
index 652851f..6c517f5 100644
--- a/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
+++ b/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
@@ -285,7 +285,7 @@
 
 ValueEnumerator::ValueEnumerator(const Module &M,
                                  bool ShouldPreserveUseListOrder)
-    : HasMDString(false), HasMDLocation(false), HasGenericDebugNode(false),
+    : HasMDString(false), HasDILocation(false), HasGenericDINode(false),
       ShouldPreserveUseListOrder(ShouldPreserveUseListOrder) {
   if (ShouldPreserveUseListOrder)
     UseListOrders = predictUseListOrder(M);
@@ -382,7 +382,7 @@
 
         // Don't enumerate the location directly -- it has a special record
         // type -- but enumerate its operands.
-        if (MDLocation *L = I.getDebugLoc())
+        if (DILocation *L = I.getDebugLoc())
           EnumerateMDNodeOperands(L);
       }
   }
@@ -548,8 +548,8 @@
     EnumerateValue(C->getValue());
 
   HasMDString |= isa<MDString>(MD);
-  HasMDLocation |= isa<MDLocation>(MD);
-  HasGenericDebugNode |= isa<GenericDebugNode>(MD);
+  HasDILocation |= isa<DILocation>(MD);
+  HasGenericDINode |= isa<GenericDINode>(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.
diff --git a/llvm/lib/Bitcode/Writer/ValueEnumerator.h b/llvm/lib/Bitcode/Writer/ValueEnumerator.h
index ba245a3..92d166e 100644
--- a/llvm/lib/Bitcode/Writer/ValueEnumerator.h
+++ b/llvm/lib/Bitcode/Writer/ValueEnumerator.h
@@ -65,8 +65,8 @@
   typedef DenseMap<const Metadata *, unsigned> MetadataMapType;
   MetadataMapType MDValueMap;
   bool HasMDString;
-  bool HasMDLocation;
-  bool HasGenericDebugNode;
+  bool HasDILocation;
+  bool HasGenericDINode;
   bool ShouldPreserveUseListOrder;
 
   typedef DenseMap<AttributeSet, unsigned> AttributeGroupMapType;
@@ -121,8 +121,8 @@
   }
 
   bool hasMDString() const { return HasMDString; }
-  bool hasMDLocation() const { return HasMDLocation; }
-  bool hasGenericDebugNode() const { return HasGenericDebugNode; }
+  bool hasDILocation() const { return HasDILocation; }
+  bool hasGenericDINode() const { return HasGenericDINode; }
 
   bool shouldPreserveUseListOrder() const { return ShouldPreserveUseListOrder; }