MC: Explicity track section and fragment ordinals.

llvm-svn: 99500

include/llvm/MC/MCAssembler.h

@@ -91,6 +91,10 @@ private:
   /// initialized.
   uint64_t EffectiveSize;
 
+  /// Ordinal - The global index of this fragment. This is the index across all
+  /// sections, not just the parent section.
+  unsigned Ordinal;
+
   /// @}
 
 protected:
@@ -106,6 +110,9 @@ public:
   MCSectionData *getParent() const { return Parent; }
   void setParent(MCSectionData *Value) { Parent = Value; }
 
+  unsigned getOrdinal() const { return Ordinal; }
+  void setOrdinal(unsigned Value) { Ordinal = Value; }
+
   static bool classof(const MCFragment *O) { return true; }
 
   virtual void dump();
@@ -390,6 +397,9 @@ private:
   iplist<MCFragment> Fragments;
   const MCSection *Section;
 
+  /// Ordinal - The section index in the assemblers section list.
+  unsigned Ordinal;
+
   /// Alignment - The maximum alignment seen in this section.
   unsigned Alignment;
 
@@ -428,6 +438,9 @@ public:
   bool hasInstructions() const { return HasInstructions; }
   void setHasInstructions(bool Value) { HasInstructions = Value; }
 
+  unsigned getOrdinal() const { return Ordinal; }
+  void setOrdinal(unsigned Value) { Ordinal = Value; }
+
   /// @name Fragment Access
   /// @{
 
@@ -451,6 +464,8 @@ public:
   bool empty() const { return Fragments.empty(); }
 
   void dump();
+
+  /// @}
 };
 
 // FIXME: Same concerns as with SectionData.

lib/MC/MCAssembler.cpp

@@ -568,6 +568,18 @@ void MCAssembler::Finish() {
       llvm::errs() << "assembler backend - pre-layout\n--\n";
       dump(); });
 
+  // Assign section and fragment ordinals, all subsequent backend code is
+  // responsible for updating these in place.
+  unsigned SectionIndex = 0;
+  unsigned FragmentIndex = 0;
+  for (MCAssembler::iterator it = begin(), ie = end(); it != ie; ++it) {
+    it->setOrdinal(SectionIndex++);
+
+    for (MCSectionData::iterator it2 = it->begin(),
+           ie2 = it->end(); it2 != ie2; ++it2)
+      it2->setOrdinal(FragmentIndex++);
+  }
+
   // Layout until everything fits.
   MCAsmLayout Layout(*this);
   while (LayoutOnce(Layout))
@@ -781,6 +793,7 @@ void MCAssembler::FinishLayout(MCAsmLayout &Layout) {
       //
       // FIXME: Add MCAsmLayout utility for this.
       DF->setParent(IF->getParent());
+      DF->setOrdinal(IF->getOrdinal());
       Layout.setFragmentOffset(DF, Layout.getFragmentOffset(IF));
       Layout.setFragmentEffectiveSize(DF, Layout.getFragmentEffectiveSize(IF));