From 52f3603b1748a1359addad22990635c865162a96 Mon Sep 17 00:00:00 2001
From: "Duncan P. N. Exon Smith" <dexonsmith@apple.com>
Date: Tue, 20 Jan 2015 01:00:23 +0000
Subject: [PATCH] Bitcode: Add ValueEnumerator::getMetadataOrNullID(), NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226533 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Bitcode/Writer/BitcodeWriter.cpp   | 20 ++++++--------------
 lib/Bitcode/Writer/ValueEnumerator.cpp |  6 ------
 lib/Bitcode/Writer/ValueEnumerator.h   |  9 ++++++++-
 3 files changed, 14 insertions(+), 21 deletions(-)

diff --git a/lib/Bitcode/Writer/BitcodeWriter.cpp b/lib/Bitcode/Writer/BitcodeWriter.cpp
index 960a7922cd8..d37faa6f085 100644
--- a/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -768,12 +768,9 @@ static void WriteMDNode(const MDNode *N,
                         SmallVectorImpl<uint64_t> &Record) {
   for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
     Metadata *MD = N->getOperand(i);
-    if (!MD) {
-      Record.push_back(0);
-      continue;
-    }
-    assert(!isa<LocalAsMetadata>(MD) && "Unexpected function-local metadata");
-    Record.push_back(VE.getMetadataID(MD) + 1);
+    assert(!(MD && isa<LocalAsMetadata>(MD)) &&
+           "Unexpected function-local metadata");
+    Record.push_back(VE.getMetadataOrNullID(MD));
   }
   Stream.EmitRecord(N->isDistinct() ? bitc::METADATA_DISTINCT_NODE
                                     : bitc::METADATA_NODE,
@@ -789,12 +786,7 @@ static void WriteMDLocation(const MDLocation *N, const ValueEnumerator &VE,
   Record.push_back(N->getLine());
   Record.push_back(N->getColumn());
   Record.push_back(VE.getMetadataID(N->getScope()));
-
-  // Always emit the inlined-at location, even though it's optional.
-  if (Metadata *InlinedAt = N->getInlinedAt())
-    Record.push_back(VE.getMetadataID(InlinedAt) + 1);
-  else
-    Record.push_back(0);
+  Record.push_back(VE.getMetadataOrNullID(N->getInlinedAt()));
 
   Stream.EmitRecord(bitc::METADATA_LOCATION, Record, Abbrev);
   Record.clear();
@@ -1754,8 +1746,8 @@ static void WriteFunction(const Function &F, ValueEnumerator &VE,
 
         Vals.push_back(DL.getLine());
         Vals.push_back(DL.getCol());
-        Vals.push_back(Scope ? VE.getMetadataID(Scope) + 1 : 0);
-        Vals.push_back(IA ? VE.getMetadataID(IA) + 1 : 0);
+        Vals.push_back(VE.getMetadataOrNullID(Scope));
+        Vals.push_back(VE.getMetadataOrNullID(IA));
         Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals);
         Vals.clear();
 
diff --git a/lib/Bitcode/Writer/ValueEnumerator.cpp b/lib/Bitcode/Writer/ValueEnumerator.cpp
index 27a63d8fefc..bd623210a5b 100644
--- a/lib/Bitcode/Writer/ValueEnumerator.cpp
+++ b/lib/Bitcode/Writer/ValueEnumerator.cpp
@@ -410,12 +410,6 @@ unsigned ValueEnumerator::getValueID(const Value *V) const {
   return I->second-1;
 }
 
-unsigned ValueEnumerator::getMetadataID(const Metadata *MD) const {
-  auto I = MDValueMap.find(MD);
-  assert(I != MDValueMap.end() && "Metadata not in slotcalculator!");
-  return I->second - 1;
-}
-
 void ValueEnumerator::dump() const {
   print(dbgs(), ValueMap, "Default");
   dbgs() << '\n';
diff --git a/lib/Bitcode/Writer/ValueEnumerator.h b/lib/Bitcode/Writer/ValueEnumerator.h
index d363c1be0dd..043c4925b39 100644
--- a/lib/Bitcode/Writer/ValueEnumerator.h
+++ b/lib/Bitcode/Writer/ValueEnumerator.h
@@ -109,7 +109,14 @@ public:
              const char *Name) const;
 
   unsigned getValueID(const Value *V) const;
-  unsigned getMetadataID(const Metadata *V) const;
+  unsigned getMetadataID(const Metadata *MD) const {
+    auto ID = getMetadataOrNullID(MD);
+    assert(ID != 0 && "Metadata not in slotcalculator!");
+    return ID - 1;
+  }
+  unsigned getMetadataOrNullID(const Metadata *MD) const {
+    return MDValueMap.lookup(MD);
+  }
 
   bool hasMDString() const { return HasMDString; }
   bool hasMDLocation() const { return HasMDLocation; }