ARM64: initial backend import

[oota-llvm.git] / include / llvm / MC / MCAsmLayout.h

diff --git a/include/llvm/MC/MCAsmLayout.h b/include/llvm/MC/MCAsmLayout.h
index 6feacf56e4d90a61b63de4b940b6316f6d107d48..3058b7b48742db623837d325dd3736c17139ff12 100644 (file)
--- a/include/llvm/MC/MCAsmLayout.h
+++ b/include/llvm/MC/MCAsmLayout.h
@@ -10,6 +10,7 @@
 #ifndef LLVM_MC_MCASMLAYOUT_H
 #define LLVM_MC_MCASMLAYOUT_H
 
+#include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/SmallVector.h"
 
 namespace llvm {
@@ -20,10 +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:
@@ -36,17 +37,22 @@ private:
   /// List of sections in layout order.
   llvm::SmallVector<MCSectionData*, 16> SectionOrder;
 
-  /// The last fragment which was layed out, or 0 if nothing has been layed
-  /// out. Fragments are always layed out in order, so all fragments with a
-  /// lower ordinal will be up to date.
-  mutable MCFragment *LastValidFragment;
+  /// The last fragment which was laid out, or 0 if nothing has been laid
+  /// out. Fragments are always laid out in order, so all fragments with a
+  /// lower ordinal will be valid.
+  mutable DenseMap<const MCSectionData*, MCFragment*> LastValidFragment;
 
   /// \brief Make sure that the layout for the given fragment is valid, lazily
   /// computing it if necessary.
-  void EnsureValid(const MCFragment *F) const;
+  void ensureValid(const MCFragment *F) const;
 
-  bool isSectionUpToDate(const MCSectionData *SD) const;
-  bool isFragmentUpToDate(const MCFragment *F) const;
+  /// \brief Is the layout for this fragment valid?
+  bool isFragmentValid(const MCFragment *F) const;
+
+  /// \brief Compute the amount of padding required before this fragment to
+  /// obey bundling restrictions.
+  uint64_t computeBundlePadding(const MCFragment *F,
+                                uint64_t FOffset, uint64_t FSize);
 
 public:
   MCAsmLayout(MCAssembler &_Assembler);
@@ -54,33 +60,15 @@ public:
   /// Get the assembler object this is a layout for.
   MCAssembler &getAssembler() const { return Assembler; }
 
-  /// \brief Update the layout because a fragment has been resized. The
-  /// fragments size should have already been updated, the \arg SlideAmount is
-  /// the delta from the old size.
-  void UpdateForSlide(MCFragment *F, int SlideAmount);
-
-  /// \brief Update the layout, replacing Src with Dst. The contents
-  /// of Src and Dst are not modified, and must be copied by the caller.
-  /// Src will be removed from the layout, but not deleted.
-  void ReplaceFragment(MCFragment *Src, MCFragment *Dst);
-
-  /// \brief Update the layout to coalesce Src into Dst. The contents
-  /// of Src and Dst are not modified, and must be coalesced by the caller.
-  /// Src will be removed from the layout, but not deleted.
-  void CoalesceFragments(MCFragment *Src, MCFragment *Dst);
-
-  /// \brief Perform a full layout.
-  void LayoutFile();
+  /// \brief Invalidate the fragments starting with F because it has been
+  /// resized. The fragment's size should have already been updated, but
+  /// its bundle padding will be recomputed.
+  void invalidateFragmentsFrom(MCFragment *F);
 
   /// \brief Perform layout for a single fragment, assuming that the previous
-  /// fragment has already been layed out correctly, and the parent section has
+  /// fragment has already been laid out correctly, and the parent section has
   /// been initialized.
-  void LayoutFragment(MCFragment *Fragment);
-
-  /// \brief Performs initial layout for a single section, assuming that the
-  /// previous section (including its fragments) has already been layed out
-  /// correctly.
-  void LayoutSection(MCSectionData *SD);
+  void layoutFragment(MCFragment *Fragment);
 
   /// @name Section Access (in layout order)
   /// @{
@@ -96,28 +84,13 @@ public:
   /// @name Fragment Layout Data
   /// @{
 
-  /// \brief Get the effective size of the given fragment, as computed in the
-  /// current layout.
-  uint64_t getFragmentEffectiveSize(const MCFragment *F) const;
-
   /// \brief Get the offset of the given fragment inside its containing section.
   uint64_t getFragmentOffset(const MCFragment *F) const;
 
-  /// @}
-  /// @name Section Layout Data
-  /// @{
-
-  /// \brief Get the computed address of the given section.
-  uint64_t getSectionAddress(const MCSectionData *SD) const;
-
   /// @}
   /// @name Utility Functions
   /// @{
 
-  /// \brief Get the address of the given fragment, as computed in the current
-  /// layout.
-  uint64_t getFragmentAddress(const MCFragment *F) const;
-
   /// \brief Get the address space size of the given section, as it effects
   /// layout. This may differ from the size reported by \see getSectionSize() by
   /// not including section tail padding.
@@ -127,12 +100,9 @@ public:
   /// file. This may include additional padding, or be 0 for virtual sections.
   uint64_t getSectionFileSize(const MCSectionData *SD) const;
 
-  /// \brief Get the logical data size of the given section.
-  uint64_t getSectionSize(const MCSectionData *SD) const;
-
-  /// \brief Get the address of the given symbol, as computed in the current
+  /// \brief Get the offset of the given symbol, as computed in the current
   /// layout.
-  uint64_t getSymbolAddress(const MCSymbolData *SD) const;
+  uint64_t getSymbolOffset(const MCSymbolData *SD) const;
 
   /// @}
 };