Add support for attribute groups in the value enumerator.

Attribute groups are essentially all AttributeSets which are used by the
program. Enumerate them here.

llvm-svn: 174844

2 files changed, 24 insertions, 0 deletions

diff --git a/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp b/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
index b2f7875111d..9f7e17b976b 100644
--- a/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
+++ b/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
@@ -427,6 +427,16 @@ void ValueEnumerator::EnumerateAttributes(const AttributeSet &PAL) {
     Attribute.push_back(PAL);
     Entry = Attribute.size();
   }
+
+  // Do lookups for all attribute groups.
+  for (unsigned i = 0, e = PAL.getNumSlots(); i != e; ++i) {
+    AttributeSet AS = PAL.getSlotAttributes(i);
+    unsigned &Entry = AttributeSetMap[AS];
+    if (Entry == 0) {
+      AttributeSets.push_back(AS);
+      Entry = AttributeSets.size();
+    }
+  }
 }
 
 void ValueEnumerator::incorporateFunction(const Function &F) {
diff --git a/llvm/lib/Bitcode/Writer/ValueEnumerator.h b/llvm/lib/Bitcode/Writer/ValueEnumerator.h
index 2d3d570354b..6e91d68fcb0 100644
--- a/llvm/lib/Bitcode/Writer/ValueEnumerator.h
+++ b/llvm/lib/Bitcode/Writer/ValueEnumerator.h
@@ -52,6 +52,10 @@ private:
   SmallVector<const MDNode *, 8> FunctionLocalMDs;
   ValueMapType MDValueMap;
 
+  typedef DenseMap<AttributeSet, unsigned> AttributeSetMapType;
+  AttributeSetMapType AttributeSetMap;
+  std::vector<AttributeSet> AttributeSets;
+
   typedef DenseMap<void*, unsigned> AttributeMapType;
   AttributeMapType AttributeMap;
   std::vector<AttributeSet> Attribute;
@@ -105,6 +109,13 @@ public:
     return I->second;
   }
 
+  unsigned getAttributeSetID(const AttributeSet &PAL) const {
+    if (PAL.isEmpty()) return 0;  // Null maps to zero.
+    AttributeSetMapType::const_iterator I = AttributeSetMap.find(PAL);
+    assert(I != AttributeSetMap.end() && "Attribute not in ValueEnumerator!");
+    return I->second;
+  }
+
   /// getFunctionConstantRange - Return the range of values that corresponds to
   /// function-local constants.
   void getFunctionConstantRange(unsigned &Start, unsigned &End) const {
@@ -124,6 +135,9 @@ public:
   const std::vector<AttributeSet> &getAttributes() const {
     return Attribute;
   }
+  const std::vector<AttributeSet> &getAttributeSets() const {
+    return AttributeSets;
+  }
 
   /// getGlobalBasicBlockID - This returns the function-specific ID for the
   /// specified basic block.  This is relatively expensive information, so it