#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 MCSymbolData;
+class MCSection;
+class MCSymbol;
/// 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:
- typedef llvm::SmallVectorImpl<MCSectionData*>::const_iterator const_iterator;
- typedef llvm::SmallVectorImpl<MCSectionData*>::iterator iterator;
-
-private:
MCAssembler &Assembler;
/// List of sections in layout order.
- llvm::SmallVector<MCSectionData*, 16> SectionOrder;
+ llvm::SmallVector<MCSection *, 16> SectionOrder;
+
+ /// 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 MCSection *, 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;
+
+ /// \brief Is the layout for this fragment valid?
+ bool isFragmentValid(const MCFragment *F) const;
public:
- MCAsmLayout(MCAssembler &_Assembler);
+ MCAsmLayout(MCAssembler &Assembler);
/// 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 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 laid out correctly, and the parent section has
+ /// been initialized.
+ void layoutFragment(MCFragment *Fragment);
- /// @name Section Access (in layout order)
+ /// \name Section Access (in layout order)
/// @{
- llvm::SmallVectorImpl<MCSectionData*> &getSectionOrder() {
- return SectionOrder;
- }
- const llvm::SmallVectorImpl<MCSectionData*> &getSectionOrder() const {
+ llvm::SmallVectorImpl<MCSection *> &getSectionOrder() { return SectionOrder; }
+ const llvm::SmallVectorImpl<MCSection *> &getSectionOrder() const {
return SectionOrder;
}
/// @}
- /// @name Fragment Layout Data
+ /// \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 Set the effective size of the given fragment.
- void setFragmentEffectiveSize(MCFragment *F, uint64_t Value);
-
/// \brief Get the offset of the given fragment inside its containing section.
uint64_t getFragmentOffset(const MCFragment *F) const;
- /// \brief Set the offset of the given fragment inside its containing section.
- void setFragmentOffset(MCFragment *F, uint64_t Value);
-
/// @}
- /// @name Section Layout Data
+ /// \name Utility Functions
/// @{
- /// \brief Get the computed address of the given section.
- uint64_t getSectionAddress(const MCSectionData *SD) const;
-
- /// \brief Set the computed address of the given section.
- void setSectionAddress(MCSectionData *SD, uint64_t Value);
-
- /// \brief Get the data size of the given section, as emitted to the object
- /// file. This may include additional padding, or be 0 for virtual sections.
- uint64_t getSectionFileSize(const MCSectionData *SD) const;
-
- /// \brief Set the data size of the given section.
- void setSectionFileSize(MCSectionData *SD, uint64_t Value);
-
/// \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.
- uint64_t getSectionAddressSize(const MCSectionData *SD) const;
-
- /// \brief Set the address space size of the given section.
- void setSectionAddressSize(MCSectionData *SD, uint64_t Value);
-
- /// \brief Get the logical data size of the given section.
- uint64_t getSectionSize(const MCSectionData *SD) const;
-
- /// \brief Set the logical data size of the given section.
- void setSectionSize(MCSectionData *SD, uint64_t Value);
+ uint64_t getSectionAddressSize(const MCSection *Sec) const;
- /// @}
- /// @name Utility Functions
- /// @{
+ /// \brief Get the data size of the given section, as emitted to the object
+ /// file. This may include additional padding, or be 0 for virtual sections.
+ uint64_t getSectionFileSize(const MCSection *Sec) const;
- /// \brief Get the address of the given fragment, as computed in the current
+ /// \brief Get the offset of the given symbol, as computed in the current
/// layout.
- uint64_t getFragmentAddress(const MCFragment *F) const;
+ /// \return True on success.
+ bool getSymbolOffset(const MCSymbol &S, uint64_t &Val) const;
- /// \brief Get the address of the given symbol, as computed in the current
- /// layout.
- uint64_t getSymbolAddress(const MCSymbolData *SD) const;
+ /// \brief Variant that reports a fatal error if the offset is not computable.
+ uint64_t getSymbolOffset(const MCSymbol &S) const;
+
+ /// \brief If this symbol is equivalent to A + Constant, return A.
+ const MCSymbol *getBaseSymbol(const MCSymbol &Symbol) const;
/// @}
};
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