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https://github.com/c64scene-ar/llvm-6502.git
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2bf6afc277
With this we don't need the EffectiveSize field anymore. Without that field LayoutFragment only updates offsets and we don't need to invalidate the current fragment when it is relaxed (only the ones following it). This is also a very small improvement in the accuracy of the layout info as we now use the after relaxation size immediately. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121857 91177308-0d34-0410-b5e6-96231b3b80d8
105 lines
3.4 KiB
C++
105 lines
3.4 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/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 requiring compute 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 addresses 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 layed out, or 0 if nothing has been layed
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/// out. Fragments are always layed out in order, so all fragments with a
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/// lower ordinal will be up to date.
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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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bool isFragmentUpToDate(const MCFragment *F) const;
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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 all following fragments because a fragment has been resized. The
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/// fragments size should have already been updated.
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void Invalidate(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 layed 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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