#ifndef LLVM_MC_MCASMLAYOUT_H
#define LLVM_MC_MCASMLAYOUT_H
+#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallVector.h"
namespace llvm {
class MCAssembler;
class MCFragment;
class MCSectionData;
+class MCSymbol;
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:
/// 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 DenseMap<const MCSectionData*, 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 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);
/// Get the assembler object this is a layout for.
MCAssembler &getAssembler() const { return Assembler; }
- /// \brief Invalidate all following fragments because a fragment has been resized. The
- /// fragments size should have already been updated.
- void Invalidate(MCFragment *F);
+ /// \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);
+ void layoutFragment(MCFragment *Fragment);
/// @name Section Access (in layout order)
/// @{
/// \brief Get the offset of the given symbol, as computed in the current
/// layout.
+ /// \result True on success.
+ bool getSymbolOffset(const MCSymbolData *SD, uint64_t &Val) const;
+
+ /// \brief Variant that reports a fatal error if the offset is not computable.
uint64_t getSymbolOffset(const MCSymbolData *SD) const;
+ /// \brief If this symbol is equivalent to A + Constant, return A.
+ const MCSymbol *getBaseSymbol(const MCSymbol &Symbol) const;
+
/// @}
};