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7be534824b
Currently, when a fragment is relaxed, its size is modified, but its offset is not (it gets laid out as a side effect of checking whether it needs relaxation), then all subsequent fragments are invalidated because their offsets need to change. When bundling is enabled, relaxed fragments need to get laid out again, because the increase in size may push it over a bundle boundary. So instead of only invalidating subsequent fragments, also invalidate the fragment that gets relaxed, which causes it to get laid out again. This patch also fixes some trailing whitespace and fixes the bundling-related debug output of MCFragments. llvm-svn: 174401
113 lines
3.8 KiB
C++
113 lines
3.8 KiB
C++
//===- MCAsmLayout.h - Assembly Layout Object -------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCASMLAYOUT_H
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#define LLVM_MC_MCASMLAYOUT_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallVector.h"
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namespace llvm {
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class MCAssembler;
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class MCFragment;
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class MCSectionData;
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class MCSymbolData;
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/// Encapsulates the layout of an assembly file at a particular point in time.
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///
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/// Assembly may require computing multiple layouts for a particular assembly
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/// file as part of the relaxation process. This class encapsulates the layout
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/// at a single point in time in such a way that it is always possible to
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/// efficiently compute the exact address of any symbol in the assembly file,
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/// even during the relaxation process.
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class MCAsmLayout {
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public:
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typedef llvm::SmallVectorImpl<MCSectionData*>::const_iterator const_iterator;
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typedef llvm::SmallVectorImpl<MCSectionData*>::iterator iterator;
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private:
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MCAssembler &Assembler;
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/// List of sections in layout order.
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llvm::SmallVector<MCSectionData*, 16> SectionOrder;
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/// The last fragment which was laid out, or 0 if nothing has been laid
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/// out. Fragments are always laid out in order, so all fragments with a
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/// lower ordinal will be valid.
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mutable DenseMap<const MCSectionData*, MCFragment*> LastValidFragment;
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/// \brief Make sure that the layout for the given fragment is valid, lazily
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/// computing it if necessary.
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void ensureValid(const MCFragment *F) const;
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/// \brief Is the layout for this fragment valid?
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bool isFragmentValid(const MCFragment *F) const;
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/// \brief Compute the amount of padding required before this fragment to
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/// obey bundling restrictions.
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uint64_t computeBundlePadding(const MCFragment *F,
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uint64_t FOffset, uint64_t FSize);
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public:
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MCAsmLayout(MCAssembler &_Assembler);
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/// Get the assembler object this is a layout for.
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MCAssembler &getAssembler() const { return Assembler; }
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/// \brief Invalidate the fragments starting with F because it has been
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/// resized. The fragment's size should have already been updated, but
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/// its bundle padding will be recomputed.
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void invalidateFragmentsFrom(MCFragment *F);
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/// \brief Perform layout for a single fragment, assuming that the previous
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/// fragment has already been laid out correctly, and the parent section has
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/// been initialized.
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void layoutFragment(MCFragment *Fragment);
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/// @name Section Access (in layout order)
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/// @{
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llvm::SmallVectorImpl<MCSectionData*> &getSectionOrder() {
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return SectionOrder;
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}
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const llvm::SmallVectorImpl<MCSectionData*> &getSectionOrder() const {
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return SectionOrder;
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}
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/// @}
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/// @name Fragment Layout Data
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/// @{
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/// \brief Get the offset of the given fragment inside its containing section.
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uint64_t getFragmentOffset(const MCFragment *F) const;
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/// @}
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/// @name Utility Functions
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/// @{
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/// \brief Get the address space size of the given section, as it effects
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/// layout. This may differ from the size reported by \see getSectionSize() by
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/// not including section tail padding.
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uint64_t getSectionAddressSize(const MCSectionData *SD) const;
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/// \brief Get the data size of the given section, as emitted to the object
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/// file. This may include additional padding, or be 0 for virtual sections.
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uint64_t getSectionFileSize(const MCSectionData *SD) const;
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/// \brief Get the offset of the given symbol, as computed in the current
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/// layout.
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uint64_t getSymbolOffset(const MCSymbolData *SD) const;
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/// @}
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};
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} // end namespace llvm
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#endif
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