Cleanup formatting, comments and naming.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169762 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/MCAsmLayout.h

@@ -21,10 +21,10 @@ class MCSymbolData;
 
 /// Encapsulates the layout of an assembly file at a particular point in time.
 ///
-/// Assembly may requiring compute multiple layouts for a particular assembly
+/// Assembly may require computing multiple layouts for a particular assembly
 /// file as part of the relaxation process. This class encapsulates the layout
 /// at a single point in time in such a way that it is always possible to
-/// efficiently compute the exact addresses of any symbol in the assembly file,
+/// efficiently compute the exact address of any symbol in the assembly file,
 /// even during the relaxation process.
 class MCAsmLayout {
 public:
@@ -54,9 +54,9 @@ public:
   /// Get the assembler object this is a layout for.
   MCAssembler &getAssembler() const { return Assembler; }
 
-  /// \brief Invalidate all following fragments because a fragment has been
+  /// \brief Invalidate the fragments after F because it has been resized.
-  /// resized. The fragments size should have already been updated.
+  /// The fragment's size should have already been updated.
-  void Invalidate(MCFragment *F);
+  void invalidateFragmentsAfter(MCFragment *F);
 
   /// \brief Perform layout for a single fragment, assuming that the previous
   /// fragment has already been laid out correctly, and the parent section has

include/llvm/MC/MCAssembler.h

@@ -738,10 +738,12 @@ private:
   bool fragmentNeedsRelaxation(const MCInstFragment *IF,
                                const MCAsmLayout &Layout) const;
 
-  /// layoutOnce - Perform one layout iteration and return true if any offsets
+  /// \brief Perform one layout iteration and return true if any offsets
   /// were adjusted.
   bool layoutOnce(MCAsmLayout &Layout);
 
+  /// \brief Perform one layout iteration of the given section and return true
+  /// if any offsets were adjusted.
   bool layoutSectionOnce(MCAsmLayout &Layout, MCSectionData &SD);
 
   bool relaxInstruction(MCAsmLayout &Layout, MCInstFragment &IF);

lib/MC/MCAssembler.cpp

@@ -80,7 +80,7 @@ bool MCAsmLayout::isFragmentUpToDate(const MCFragment *F) const {
   return F->getLayoutOrder() <= LastValid->getLayoutOrder();
 }
 
-void MCAsmLayout::Invalidate(MCFragment *F) {
+void MCAsmLayout::invalidateFragmentsAfter(MCFragment *F) {
   // If this fragment wasn't already up-to-date, we don't need to do anything.
   if (!isFragmentUpToDate(F))
     return;
@@ -678,7 +678,7 @@ bool MCAssembler::fragmentNeedsRelaxation(const MCInstFragment *IF,
     return false;
 
   for (MCInstFragment::const_fixup_iterator it = IF->fixup_begin(),
-         ie = IF->fixup_end(); it != ie; ++it)
+       ie = IF->fixup_end(); it != ie; ++it)
     if (fixupNeedsRelaxation(*it, IF, Layout))
       return true;
 
@@ -767,39 +767,39 @@ bool MCAssembler::relaxDwarfCallFrameFragment(MCAsmLayout &Layout,
   return OldSize != Data.size();
 }
 
-bool MCAssembler::layoutSectionOnce(MCAsmLayout &Layout,
+bool MCAssembler::layoutSectionOnce(MCAsmLayout &Layout, MCSectionData &SD) {
-                                    MCSectionData &SD) {
+  // Holds the first fragment which needed relaxing during this layout. It will
+  // remain NULL if none were relaxed.
   MCFragment *FirstInvalidFragment = NULL;
+
   // Scan for fragments that need relaxation.
-  for (MCSectionData::iterator it2 = SD.begin(),
+  for (MCSectionData::iterator I = SD.begin(), IE = SD.end(); I != IE; ++I) {
-         ie2 = SD.end(); it2 != ie2; ++it2) {
+    // Check if this is a fragment that needs relaxation.
-    // Check if this is an fragment that needs relaxation.
+    bool RelaxedFrag = false;
-    bool relaxedFrag = false;
+    switch(I->getKind()) {
-    switch(it2->getKind()) {
     default:
-          break;
+      break;
     case MCFragment::FT_Inst:
-      relaxedFrag = relaxInstruction(Layout, *cast<MCInstFragment>(it2));
+      RelaxedFrag = relaxInstruction(Layout, *cast<MCInstFragment>(I));
       break;
     case MCFragment::FT_Dwarf:
-      relaxedFrag = relaxDwarfLineAddr(Layout,
+      RelaxedFrag = relaxDwarfLineAddr(Layout,
-                                       *cast<MCDwarfLineAddrFragment>(it2));
+                                       *cast<MCDwarfLineAddrFragment>(I));
       break;
     case MCFragment::FT_DwarfFrame:
-      relaxedFrag =
+      RelaxedFrag =
         relaxDwarfCallFrameFragment(Layout,
-                                    *cast<MCDwarfCallFrameFragment>(it2));
+                                    *cast<MCDwarfCallFrameFragment>(I));
       break;
     case MCFragment::FT_LEB:
-      relaxedFrag = relaxLEB(Layout, *cast<MCLEBFragment>(it2));
+      RelaxedFrag = relaxLEB(Layout, *cast<MCLEBFragment>(I));
       break;
     }
-    // Update the layout, and remember that we relaxed.
+    if (RelaxedFrag && !FirstInvalidFragment)
-    if (relaxedFrag && !FirstInvalidFragment)
+      FirstInvalidFragment = I;
-      FirstInvalidFragment = it2;
   }
   if (FirstInvalidFragment) {
-    Layout.Invalidate(FirstInvalidFragment);
+    Layout.invalidateFragmentsAfter(FirstInvalidFragment);
     return true;
   }
   return false;
@@ -811,7 +811,7 @@ bool MCAssembler::layoutOnce(MCAsmLayout &Layout) {
   bool WasRelaxed = false;
   for (iterator it = begin(), ie = end(); it != ie; ++it) {
     MCSectionData &SD = *it;
-    while(layoutSectionOnce(Layout, SD))
+    while (layoutSectionOnce(Layout, SD))
       WasRelaxed = true;
   }