mirror of
https://github.com/c64scene-ar/llvm-6502.git
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ba9e3285d0
This reduces MCSymbol from 64 to 56 bytes on x86_64. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238747 91177308-0d34-0410-b5e6-96231b3b80d8
941 lines
29 KiB
C++
941 lines
29 KiB
C++
//===- MCAssembler.h - Object File Generation -------------------*- 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_MCASSEMBLER_H
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#define LLVM_MC_MCASSEMBLER_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/DenseSet.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/ilist.h"
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#include "llvm/ADT/ilist_node.h"
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#include "llvm/ADT/iterator.h"
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#include "llvm/MC/MCDirectives.h"
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#include "llvm/MC/MCFixup.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCLinkerOptimizationHint.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/DataTypes.h"
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#include <algorithm>
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#include <vector> // FIXME: Shouldn't be needed.
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namespace llvm {
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class raw_ostream;
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class MCAsmLayout;
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class MCAssembler;
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class MCContext;
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class MCCodeEmitter;
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class MCExpr;
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class MCFragment;
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class MCObjectWriter;
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class MCSection;
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class MCSubtargetInfo;
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class MCValue;
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class MCAsmBackend;
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class MCFragment : public ilist_node<MCFragment> {
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friend class MCAsmLayout;
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MCFragment(const MCFragment &) = delete;
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void operator=(const MCFragment &) = delete;
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public:
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enum FragmentType {
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FT_Align,
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FT_Data,
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FT_CompactEncodedInst,
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FT_Fill,
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FT_Relaxable,
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FT_Org,
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FT_Dwarf,
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FT_DwarfFrame,
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FT_LEB,
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FT_SafeSEH
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};
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private:
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FragmentType Kind;
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/// The data for the section this fragment is in.
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MCSection *Parent;
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/// Atom - The atom this fragment is in, as represented by it's defining
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/// symbol.
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const MCSymbol *Atom;
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/// \name Assembler Backend Data
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/// @{
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//
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// FIXME: This could all be kept private to the assembler implementation.
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/// Offset - The offset of this fragment in its section. This is ~0 until
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/// initialized.
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uint64_t Offset;
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/// LayoutOrder - The layout order of this fragment.
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unsigned LayoutOrder;
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/// @}
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protected:
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MCFragment(FragmentType Kind, MCSection *Parent = nullptr);
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public:
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// Only for sentinel.
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MCFragment();
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virtual ~MCFragment();
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FragmentType getKind() const { return Kind; }
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MCSection *getParent() const { return Parent; }
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void setParent(MCSection *Value) { Parent = Value; }
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const MCSymbol *getAtom() const { return Atom; }
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void setAtom(const MCSymbol *Value) { Atom = Value; }
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unsigned getLayoutOrder() const { return LayoutOrder; }
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void setLayoutOrder(unsigned Value) { LayoutOrder = Value; }
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/// \brief Does this fragment have instructions emitted into it? By default
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/// this is false, but specific fragment types may set it to true.
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virtual bool hasInstructions() const { return false; }
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/// \brief Should this fragment be placed at the end of an aligned bundle?
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virtual bool alignToBundleEnd() const { return false; }
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virtual void setAlignToBundleEnd(bool V) {}
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/// \brief Get the padding size that must be inserted before this fragment.
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/// Used for bundling. By default, no padding is inserted.
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/// Note that padding size is restricted to 8 bits. This is an optimization
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/// to reduce the amount of space used for each fragment. In practice, larger
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/// padding should never be required.
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virtual uint8_t getBundlePadding() const { return 0; }
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/// \brief Set the padding size for this fragment. By default it's a no-op,
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/// and only some fragments have a meaningful implementation.
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virtual void setBundlePadding(uint8_t N) {}
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void dump();
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};
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/// Interface implemented by fragments that contain encoded instructions and/or
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/// data.
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///
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class MCEncodedFragment : public MCFragment {
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virtual void anchor();
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uint8_t BundlePadding;
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public:
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MCEncodedFragment(MCFragment::FragmentType FType, MCSection *Sec = nullptr)
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: MCFragment(FType, Sec), BundlePadding(0) {}
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~MCEncodedFragment() override;
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virtual SmallVectorImpl<char> &getContents() = 0;
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virtual const SmallVectorImpl<char> &getContents() const = 0;
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uint8_t getBundlePadding() const override { return BundlePadding; }
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void setBundlePadding(uint8_t N) override { BundlePadding = N; }
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static bool classof(const MCFragment *F) {
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MCFragment::FragmentType Kind = F->getKind();
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switch (Kind) {
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default:
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return false;
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case MCFragment::FT_Relaxable:
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case MCFragment::FT_CompactEncodedInst:
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case MCFragment::FT_Data:
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return true;
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}
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}
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};
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/// Interface implemented by fragments that contain encoded instructions and/or
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/// data and also have fixups registered.
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///
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class MCEncodedFragmentWithFixups : public MCEncodedFragment {
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void anchor() override;
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public:
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MCEncodedFragmentWithFixups(MCFragment::FragmentType FType,
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MCSection *Sec = nullptr)
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: MCEncodedFragment(FType, Sec) {}
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~MCEncodedFragmentWithFixups() override;
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typedef SmallVectorImpl<MCFixup>::const_iterator const_fixup_iterator;
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typedef SmallVectorImpl<MCFixup>::iterator fixup_iterator;
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virtual SmallVectorImpl<MCFixup> &getFixups() = 0;
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virtual const SmallVectorImpl<MCFixup> &getFixups() const = 0;
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virtual fixup_iterator fixup_begin() = 0;
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virtual const_fixup_iterator fixup_begin() const = 0;
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virtual fixup_iterator fixup_end() = 0;
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virtual const_fixup_iterator fixup_end() const = 0;
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static bool classof(const MCFragment *F) {
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MCFragment::FragmentType Kind = F->getKind();
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return Kind == MCFragment::FT_Relaxable || Kind == MCFragment::FT_Data;
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}
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};
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/// Fragment for data and encoded instructions.
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///
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class MCDataFragment : public MCEncodedFragmentWithFixups {
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void anchor() override;
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/// \brief Does this fragment contain encoded instructions anywhere in it?
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bool HasInstructions;
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/// \brief Should this fragment be aligned to the end of a bundle?
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bool AlignToBundleEnd;
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SmallVector<char, 32> Contents;
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/// Fixups - The list of fixups in this fragment.
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SmallVector<MCFixup, 4> Fixups;
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public:
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MCDataFragment(MCSection *Sec = nullptr)
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: MCEncodedFragmentWithFixups(FT_Data, Sec), HasInstructions(false),
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AlignToBundleEnd(false) {}
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SmallVectorImpl<char> &getContents() override { return Contents; }
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const SmallVectorImpl<char> &getContents() const override { return Contents; }
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SmallVectorImpl<MCFixup> &getFixups() override { return Fixups; }
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const SmallVectorImpl<MCFixup> &getFixups() const override { return Fixups; }
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bool hasInstructions() const override { return HasInstructions; }
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virtual void setHasInstructions(bool V) { HasInstructions = V; }
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bool alignToBundleEnd() const override { return AlignToBundleEnd; }
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void setAlignToBundleEnd(bool V) override { AlignToBundleEnd = V; }
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fixup_iterator fixup_begin() override { return Fixups.begin(); }
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const_fixup_iterator fixup_begin() const override { return Fixups.begin(); }
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fixup_iterator fixup_end() override { return Fixups.end(); }
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const_fixup_iterator fixup_end() const override { return Fixups.end(); }
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static bool classof(const MCFragment *F) {
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return F->getKind() == MCFragment::FT_Data;
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}
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};
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/// This is a compact (memory-size-wise) fragment for holding an encoded
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/// instruction (non-relaxable) that has no fixups registered. When applicable,
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/// it can be used instead of MCDataFragment and lead to lower memory
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/// consumption.
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///
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class MCCompactEncodedInstFragment : public MCEncodedFragment {
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void anchor() override;
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/// \brief Should this fragment be aligned to the end of a bundle?
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bool AlignToBundleEnd;
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SmallVector<char, 4> Contents;
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public:
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MCCompactEncodedInstFragment(MCSection *Sec = nullptr)
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: MCEncodedFragment(FT_CompactEncodedInst, Sec), AlignToBundleEnd(false) {
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}
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bool hasInstructions() const override { return true; }
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SmallVectorImpl<char> &getContents() override { return Contents; }
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const SmallVectorImpl<char> &getContents() const override { return Contents; }
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bool alignToBundleEnd() const override { return AlignToBundleEnd; }
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void setAlignToBundleEnd(bool V) override { AlignToBundleEnd = V; }
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static bool classof(const MCFragment *F) {
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return F->getKind() == MCFragment::FT_CompactEncodedInst;
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}
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};
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/// A relaxable fragment holds on to its MCInst, since it may need to be
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/// relaxed during the assembler layout and relaxation stage.
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///
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class MCRelaxableFragment : public MCEncodedFragmentWithFixups {
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void anchor() override;
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/// Inst - The instruction this is a fragment for.
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MCInst Inst;
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/// STI - The MCSubtargetInfo in effect when the instruction was encoded.
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/// Keep a copy instead of a reference to make sure that updates to STI
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/// in the assembler are not seen here.
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const MCSubtargetInfo STI;
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/// Contents - Binary data for the currently encoded instruction.
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SmallVector<char, 8> Contents;
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/// Fixups - The list of fixups in this fragment.
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SmallVector<MCFixup, 1> Fixups;
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public:
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MCRelaxableFragment(const MCInst &Inst, const MCSubtargetInfo &STI,
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MCSection *Sec = nullptr)
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: MCEncodedFragmentWithFixups(FT_Relaxable, Sec), Inst(Inst), STI(STI) {}
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SmallVectorImpl<char> &getContents() override { return Contents; }
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const SmallVectorImpl<char> &getContents() const override { return Contents; }
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const MCInst &getInst() const { return Inst; }
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void setInst(const MCInst &Value) { Inst = Value; }
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const MCSubtargetInfo &getSubtargetInfo() { return STI; }
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SmallVectorImpl<MCFixup> &getFixups() override { return Fixups; }
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const SmallVectorImpl<MCFixup> &getFixups() const override { return Fixups; }
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bool hasInstructions() const override { return true; }
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fixup_iterator fixup_begin() override { return Fixups.begin(); }
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const_fixup_iterator fixup_begin() const override { return Fixups.begin(); }
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fixup_iterator fixup_end() override { return Fixups.end(); }
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const_fixup_iterator fixup_end() const override { return Fixups.end(); }
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static bool classof(const MCFragment *F) {
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return F->getKind() == MCFragment::FT_Relaxable;
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}
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};
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class MCAlignFragment : public MCFragment {
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virtual void anchor();
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/// Alignment - The alignment to ensure, in bytes.
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unsigned Alignment;
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/// Value - Value to use for filling padding bytes.
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int64_t Value;
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/// ValueSize - The size of the integer (in bytes) of \p Value.
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unsigned ValueSize;
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/// MaxBytesToEmit - The maximum number of bytes to emit; if the alignment
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/// cannot be satisfied in this width then this fragment is ignored.
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unsigned MaxBytesToEmit;
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/// EmitNops - Flag to indicate that (optimal) NOPs should be emitted instead
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/// of using the provided value. The exact interpretation of this flag is
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/// target dependent.
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bool EmitNops : 1;
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public:
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MCAlignFragment(unsigned Alignment, int64_t Value, unsigned ValueSize,
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unsigned MaxBytesToEmit, MCSection *Sec = nullptr)
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: MCFragment(FT_Align, Sec), Alignment(Alignment), Value(Value),
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ValueSize(ValueSize), MaxBytesToEmit(MaxBytesToEmit), EmitNops(false) {}
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/// \name Accessors
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/// @{
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unsigned getAlignment() const { return Alignment; }
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int64_t getValue() const { return Value; }
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unsigned getValueSize() const { return ValueSize; }
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unsigned getMaxBytesToEmit() const { return MaxBytesToEmit; }
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bool hasEmitNops() const { return EmitNops; }
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void setEmitNops(bool Value) { EmitNops = Value; }
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/// @}
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static bool classof(const MCFragment *F) {
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return F->getKind() == MCFragment::FT_Align;
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}
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};
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class MCFillFragment : public MCFragment {
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virtual void anchor();
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/// Value - Value to use for filling bytes.
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int64_t Value;
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/// ValueSize - The size (in bytes) of \p Value to use when filling, or 0 if
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/// this is a virtual fill fragment.
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unsigned ValueSize;
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/// Size - The number of bytes to insert.
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uint64_t Size;
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public:
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MCFillFragment(int64_t Value, unsigned ValueSize, uint64_t Size,
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MCSection *Sec = nullptr)
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: MCFragment(FT_Fill, Sec), Value(Value), ValueSize(ValueSize),
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Size(Size) {
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assert((!ValueSize || (Size % ValueSize) == 0) &&
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"Fill size must be a multiple of the value size!");
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}
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/// \name Accessors
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/// @{
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int64_t getValue() const { return Value; }
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unsigned getValueSize() const { return ValueSize; }
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uint64_t getSize() const { return Size; }
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/// @}
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static bool classof(const MCFragment *F) {
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return F->getKind() == MCFragment::FT_Fill;
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}
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};
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class MCOrgFragment : public MCFragment {
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virtual void anchor();
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/// Offset - The offset this fragment should start at.
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const MCExpr *Offset;
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/// Value - Value to use for filling bytes.
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int8_t Value;
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public:
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MCOrgFragment(const MCExpr &Offset, int8_t Value, MCSection *Sec = nullptr)
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: MCFragment(FT_Org, Sec), Offset(&Offset), Value(Value) {}
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/// \name Accessors
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/// @{
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const MCExpr &getOffset() const { return *Offset; }
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uint8_t getValue() const { return Value; }
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/// @}
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static bool classof(const MCFragment *F) {
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return F->getKind() == MCFragment::FT_Org;
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}
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};
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class MCLEBFragment : public MCFragment {
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virtual void anchor();
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/// Value - The value this fragment should contain.
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const MCExpr *Value;
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/// IsSigned - True if this is a sleb128, false if uleb128.
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bool IsSigned;
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SmallString<8> Contents;
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public:
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MCLEBFragment(const MCExpr &Value_, bool IsSigned_, MCSection *Sec = nullptr)
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: MCFragment(FT_LEB, Sec), Value(&Value_), IsSigned(IsSigned_) {
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Contents.push_back(0);
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}
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/// \name Accessors
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/// @{
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const MCExpr &getValue() const { return *Value; }
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bool isSigned() const { return IsSigned; }
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SmallString<8> &getContents() { return Contents; }
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const SmallString<8> &getContents() const { return Contents; }
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/// @}
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static bool classof(const MCFragment *F) {
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return F->getKind() == MCFragment::FT_LEB;
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}
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};
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class MCDwarfLineAddrFragment : public MCFragment {
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virtual void anchor();
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/// LineDelta - the value of the difference between the two line numbers
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/// between two .loc dwarf directives.
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int64_t LineDelta;
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/// AddrDelta - The expression for the difference of the two symbols that
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/// make up the address delta between two .loc dwarf directives.
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const MCExpr *AddrDelta;
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SmallString<8> Contents;
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public:
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MCDwarfLineAddrFragment(int64_t LineDelta, const MCExpr &AddrDelta,
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MCSection *Sec = nullptr)
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: MCFragment(FT_Dwarf, Sec), LineDelta(LineDelta), AddrDelta(&AddrDelta) {
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Contents.push_back(0);
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}
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/// \name Accessors
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/// @{
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int64_t getLineDelta() const { return LineDelta; }
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const MCExpr &getAddrDelta() const { return *AddrDelta; }
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SmallString<8> &getContents() { return Contents; }
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const SmallString<8> &getContents() const { return Contents; }
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/// @}
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static bool classof(const MCFragment *F) {
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return F->getKind() == MCFragment::FT_Dwarf;
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}
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};
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class MCDwarfCallFrameFragment : public MCFragment {
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virtual void anchor();
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/// AddrDelta - The expression for the difference of the two symbols that
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/// make up the address delta between two .cfi_* dwarf directives.
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const MCExpr *AddrDelta;
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SmallString<8> Contents;
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public:
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MCDwarfCallFrameFragment(const MCExpr &AddrDelta, MCSection *Sec = nullptr)
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: MCFragment(FT_DwarfFrame, Sec), AddrDelta(&AddrDelta) {
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Contents.push_back(0);
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}
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/// \name Accessors
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/// @{
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const MCExpr &getAddrDelta() const { return *AddrDelta; }
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SmallString<8> &getContents() { return Contents; }
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const SmallString<8> &getContents() const { return Contents; }
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/// @}
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static bool classof(const MCFragment *F) {
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return F->getKind() == MCFragment::FT_DwarfFrame;
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}
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};
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class MCSafeSEHFragment : public MCFragment {
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virtual void anchor();
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const MCSymbol *Sym;
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public:
|
|
MCSafeSEHFragment(const MCSymbol *Sym, MCSection *Sec = nullptr)
|
|
: MCFragment(FT_SafeSEH, Sec), Sym(Sym) {}
|
|
|
|
/// \name Accessors
|
|
/// @{
|
|
|
|
const MCSymbol *getSymbol() { return Sym; }
|
|
const MCSymbol *getSymbol() const { return Sym; }
|
|
|
|
/// @}
|
|
|
|
static bool classof(const MCFragment *F) {
|
|
return F->getKind() == MCFragment::FT_SafeSEH;
|
|
}
|
|
};
|
|
|
|
// FIXME: This really doesn't belong here. See comments below.
|
|
struct IndirectSymbolData {
|
|
MCSymbol *Symbol;
|
|
MCSection *Section;
|
|
};
|
|
|
|
// FIXME: Ditto this. Purely so the Streamer and the ObjectWriter can talk
|
|
// to one another.
|
|
struct DataRegionData {
|
|
// This enum should be kept in sync w/ the mach-o definition in
|
|
// llvm/Object/MachOFormat.h.
|
|
enum KindTy { Data = 1, JumpTable8, JumpTable16, JumpTable32 } Kind;
|
|
MCSymbol *Start;
|
|
MCSymbol *End;
|
|
};
|
|
|
|
class MCAssembler {
|
|
friend class MCAsmLayout;
|
|
|
|
public:
|
|
typedef std::vector<MCSection *> SectionListType;
|
|
typedef std::vector<const MCSymbol *> SymbolDataListType;
|
|
|
|
typedef pointee_iterator<SectionListType::const_iterator> const_iterator;
|
|
typedef pointee_iterator<SectionListType::iterator> iterator;
|
|
|
|
typedef pointee_iterator<SymbolDataListType::const_iterator>
|
|
const_symbol_iterator;
|
|
typedef pointee_iterator<SymbolDataListType::iterator> symbol_iterator;
|
|
|
|
typedef iterator_range<symbol_iterator> symbol_range;
|
|
typedef iterator_range<const_symbol_iterator> const_symbol_range;
|
|
|
|
typedef std::vector<IndirectSymbolData>::const_iterator
|
|
const_indirect_symbol_iterator;
|
|
typedef std::vector<IndirectSymbolData>::iterator indirect_symbol_iterator;
|
|
|
|
typedef std::vector<DataRegionData>::const_iterator
|
|
const_data_region_iterator;
|
|
typedef std::vector<DataRegionData>::iterator data_region_iterator;
|
|
|
|
/// MachO specific deployment target version info.
|
|
// A Major version of 0 indicates that no version information was supplied
|
|
// and so the corresponding load command should not be emitted.
|
|
typedef struct {
|
|
MCVersionMinType Kind;
|
|
unsigned Major;
|
|
unsigned Minor;
|
|
unsigned Update;
|
|
} VersionMinInfoType;
|
|
|
|
private:
|
|
MCAssembler(const MCAssembler &) = delete;
|
|
void operator=(const MCAssembler &) = delete;
|
|
|
|
MCContext &Context;
|
|
|
|
MCAsmBackend &Backend;
|
|
|
|
MCCodeEmitter &Emitter;
|
|
|
|
MCObjectWriter &Writer;
|
|
|
|
raw_ostream &OS;
|
|
|
|
SectionListType Sections;
|
|
|
|
SymbolDataListType Symbols;
|
|
|
|
DenseSet<const MCSymbol *> LocalsUsedInReloc;
|
|
|
|
std::vector<IndirectSymbolData> IndirectSymbols;
|
|
|
|
std::vector<DataRegionData> DataRegions;
|
|
|
|
/// The list of linker options to propagate into the object file.
|
|
std::vector<std::vector<std::string>> LinkerOptions;
|
|
|
|
/// List of declared file names
|
|
std::vector<std::string> FileNames;
|
|
|
|
/// The set of function symbols for which a .thumb_func directive has
|
|
/// been seen.
|
|
//
|
|
// FIXME: We really would like this in target specific code rather than
|
|
// here. Maybe when the relocation stuff moves to target specific,
|
|
// this can go with it? The streamer would need some target specific
|
|
// refactoring too.
|
|
mutable SmallPtrSet<const MCSymbol *, 64> ThumbFuncs;
|
|
|
|
/// \brief The bundle alignment size currently set in the assembler.
|
|
///
|
|
/// By default it's 0, which means bundling is disabled.
|
|
unsigned BundleAlignSize;
|
|
|
|
unsigned RelaxAll : 1;
|
|
unsigned SubsectionsViaSymbols : 1;
|
|
|
|
/// ELF specific e_header flags
|
|
// It would be good if there were an MCELFAssembler class to hold this.
|
|
// ELF header flags are used both by the integrated and standalone assemblers.
|
|
// Access to the flags is necessary in cases where assembler directives affect
|
|
// which flags to be set.
|
|
unsigned ELFHeaderEFlags;
|
|
|
|
/// Used to communicate Linker Optimization Hint information between
|
|
/// the Streamer and the .o writer
|
|
MCLOHContainer LOHContainer;
|
|
|
|
VersionMinInfoType VersionMinInfo;
|
|
|
|
private:
|
|
/// Evaluate a fixup to a relocatable expression and the value which should be
|
|
/// placed into the fixup.
|
|
///
|
|
/// \param Layout The layout to use for evaluation.
|
|
/// \param Fixup The fixup to evaluate.
|
|
/// \param DF The fragment the fixup is inside.
|
|
/// \param Target [out] On return, the relocatable expression the fixup
|
|
/// evaluates to.
|
|
/// \param Value [out] On return, the value of the fixup as currently laid
|
|
/// out.
|
|
/// \return Whether the fixup value was fully resolved. This is true if the
|
|
/// \p Value result is fixed, otherwise the value may change due to
|
|
/// relocation.
|
|
bool evaluateFixup(const MCAsmLayout &Layout, const MCFixup &Fixup,
|
|
const MCFragment *DF, MCValue &Target,
|
|
uint64_t &Value) const;
|
|
|
|
/// Check whether a fixup can be satisfied, or whether it needs to be relaxed
|
|
/// (increased in size, in order to hold its value correctly).
|
|
bool fixupNeedsRelaxation(const MCFixup &Fixup, const MCRelaxableFragment *DF,
|
|
const MCAsmLayout &Layout) const;
|
|
|
|
/// Check whether the given fragment needs relaxation.
|
|
bool fragmentNeedsRelaxation(const MCRelaxableFragment *IF,
|
|
const MCAsmLayout &Layout) const;
|
|
|
|
/// \brief Perform one layout iteration and return true if any offsets
|
|
/// were adjusted.
|
|
bool layoutOnce(MCAsmLayout &Layout);
|
|
|
|
/// \brief Perform one layout iteration of the given section and return true
|
|
/// if any offsets were adjusted.
|
|
bool layoutSectionOnce(MCAsmLayout &Layout, MCSection &Sec);
|
|
|
|
bool relaxInstruction(MCAsmLayout &Layout, MCRelaxableFragment &IF);
|
|
|
|
bool relaxLEB(MCAsmLayout &Layout, MCLEBFragment &IF);
|
|
|
|
bool relaxDwarfLineAddr(MCAsmLayout &Layout, MCDwarfLineAddrFragment &DF);
|
|
bool relaxDwarfCallFrameFragment(MCAsmLayout &Layout,
|
|
MCDwarfCallFrameFragment &DF);
|
|
|
|
/// finishLayout - Finalize a layout, including fragment lowering.
|
|
void finishLayout(MCAsmLayout &Layout);
|
|
|
|
std::pair<uint64_t, bool> handleFixup(const MCAsmLayout &Layout,
|
|
MCFragment &F, const MCFixup &Fixup);
|
|
|
|
public:
|
|
void addLocalUsedInReloc(const MCSymbol &Sym);
|
|
bool isLocalUsedInReloc(const MCSymbol &Sym) const;
|
|
|
|
/// Compute the effective fragment size assuming it is laid out at the given
|
|
/// \p SectionAddress and \p FragmentOffset.
|
|
uint64_t computeFragmentSize(const MCAsmLayout &Layout,
|
|
const MCFragment &F) const;
|
|
|
|
/// Find the symbol which defines the atom containing the given symbol, or
|
|
/// null if there is no such symbol.
|
|
const MCSymbol *getAtom(const MCSymbol &S) const;
|
|
|
|
/// Check whether a particular symbol is visible to the linker and is required
|
|
/// in the symbol table, or whether it can be discarded by the assembler. This
|
|
/// also effects whether the assembler treats the label as potentially
|
|
/// defining a separate atom.
|
|
bool isSymbolLinkerVisible(const MCSymbol &SD) const;
|
|
|
|
/// Emit the section contents using the given object writer.
|
|
void writeSectionData(const MCSection *Section,
|
|
const MCAsmLayout &Layout) const;
|
|
|
|
/// Check whether a given symbol has been flagged with .thumb_func.
|
|
bool isThumbFunc(const MCSymbol *Func) const;
|
|
|
|
/// Flag a function symbol as the target of a .thumb_func directive.
|
|
void setIsThumbFunc(const MCSymbol *Func) { ThumbFuncs.insert(Func); }
|
|
|
|
/// ELF e_header flags
|
|
unsigned getELFHeaderEFlags() const { return ELFHeaderEFlags; }
|
|
void setELFHeaderEFlags(unsigned Flags) { ELFHeaderEFlags = Flags; }
|
|
|
|
/// MachO deployment target version information.
|
|
const VersionMinInfoType &getVersionMinInfo() const { return VersionMinInfo; }
|
|
void setVersionMinInfo(MCVersionMinType Kind, unsigned Major, unsigned Minor,
|
|
unsigned Update) {
|
|
VersionMinInfo.Kind = Kind;
|
|
VersionMinInfo.Major = Major;
|
|
VersionMinInfo.Minor = Minor;
|
|
VersionMinInfo.Update = Update;
|
|
}
|
|
|
|
public:
|
|
/// Construct a new assembler instance.
|
|
///
|
|
/// \param OS The stream to output to.
|
|
//
|
|
// FIXME: How are we going to parameterize this? Two obvious options are stay
|
|
// concrete and require clients to pass in a target like object. The other
|
|
// option is to make this abstract, and have targets provide concrete
|
|
// implementations as we do with AsmParser.
|
|
MCAssembler(MCContext &Context_, MCAsmBackend &Backend_,
|
|
MCCodeEmitter &Emitter_, MCObjectWriter &Writer_,
|
|
raw_ostream &OS);
|
|
~MCAssembler();
|
|
|
|
/// Reuse an assembler instance
|
|
///
|
|
void reset();
|
|
|
|
MCContext &getContext() const { return Context; }
|
|
|
|
MCAsmBackend &getBackend() const { return Backend; }
|
|
|
|
MCCodeEmitter &getEmitter() const { return Emitter; }
|
|
|
|
MCObjectWriter &getWriter() const { return Writer; }
|
|
|
|
/// Finish - Do final processing and write the object to the output stream.
|
|
/// \p Writer is used for custom object writer (as the MCJIT does),
|
|
/// if not specified it is automatically created from backend.
|
|
void Finish();
|
|
|
|
// FIXME: This does not belong here.
|
|
bool getSubsectionsViaSymbols() const { return SubsectionsViaSymbols; }
|
|
void setSubsectionsViaSymbols(bool Value) { SubsectionsViaSymbols = Value; }
|
|
|
|
bool getRelaxAll() const { return RelaxAll; }
|
|
void setRelaxAll(bool Value) { RelaxAll = Value; }
|
|
|
|
bool isBundlingEnabled() const { return BundleAlignSize != 0; }
|
|
|
|
unsigned getBundleAlignSize() const { return BundleAlignSize; }
|
|
|
|
void setBundleAlignSize(unsigned Size) {
|
|
assert((Size == 0 || !(Size & (Size - 1))) &&
|
|
"Expect a power-of-two bundle align size");
|
|
BundleAlignSize = Size;
|
|
}
|
|
|
|
/// \name Section List Access
|
|
/// @{
|
|
|
|
iterator begin() { return Sections.begin(); }
|
|
const_iterator begin() const { return Sections.begin(); }
|
|
|
|
iterator end() { return Sections.end(); }
|
|
const_iterator end() const { return Sections.end(); }
|
|
|
|
size_t size() const { return Sections.size(); }
|
|
|
|
/// @}
|
|
/// \name Symbol List Access
|
|
/// @{
|
|
symbol_iterator symbol_begin() { return Symbols.begin(); }
|
|
const_symbol_iterator symbol_begin() const { return Symbols.begin(); }
|
|
|
|
symbol_iterator symbol_end() { return Symbols.end(); }
|
|
const_symbol_iterator symbol_end() const { return Symbols.end(); }
|
|
|
|
symbol_range symbols() { return make_range(symbol_begin(), symbol_end()); }
|
|
const_symbol_range symbols() const {
|
|
return make_range(symbol_begin(), symbol_end());
|
|
}
|
|
|
|
size_t symbol_size() const { return Symbols.size(); }
|
|
|
|
/// @}
|
|
/// \name Indirect Symbol List Access
|
|
/// @{
|
|
|
|
// FIXME: This is a total hack, this should not be here. Once things are
|
|
// factored so that the streamer has direct access to the .o writer, it can
|
|
// disappear.
|
|
std::vector<IndirectSymbolData> &getIndirectSymbols() {
|
|
return IndirectSymbols;
|
|
}
|
|
|
|
indirect_symbol_iterator indirect_symbol_begin() {
|
|
return IndirectSymbols.begin();
|
|
}
|
|
const_indirect_symbol_iterator indirect_symbol_begin() const {
|
|
return IndirectSymbols.begin();
|
|
}
|
|
|
|
indirect_symbol_iterator indirect_symbol_end() {
|
|
return IndirectSymbols.end();
|
|
}
|
|
const_indirect_symbol_iterator indirect_symbol_end() const {
|
|
return IndirectSymbols.end();
|
|
}
|
|
|
|
size_t indirect_symbol_size() const { return IndirectSymbols.size(); }
|
|
|
|
/// @}
|
|
/// \name Linker Option List Access
|
|
/// @{
|
|
|
|
std::vector<std::vector<std::string>> &getLinkerOptions() {
|
|
return LinkerOptions;
|
|
}
|
|
|
|
/// @}
|
|
/// \name Data Region List Access
|
|
/// @{
|
|
|
|
// FIXME: This is a total hack, this should not be here. Once things are
|
|
// factored so that the streamer has direct access to the .o writer, it can
|
|
// disappear.
|
|
std::vector<DataRegionData> &getDataRegions() { return DataRegions; }
|
|
|
|
data_region_iterator data_region_begin() { return DataRegions.begin(); }
|
|
const_data_region_iterator data_region_begin() const {
|
|
return DataRegions.begin();
|
|
}
|
|
|
|
data_region_iterator data_region_end() { return DataRegions.end(); }
|
|
const_data_region_iterator data_region_end() const {
|
|
return DataRegions.end();
|
|
}
|
|
|
|
size_t data_region_size() const { return DataRegions.size(); }
|
|
|
|
/// @}
|
|
/// \name Data Region List Access
|
|
/// @{
|
|
|
|
// FIXME: This is a total hack, this should not be here. Once things are
|
|
// factored so that the streamer has direct access to the .o writer, it can
|
|
// disappear.
|
|
MCLOHContainer &getLOHContainer() { return LOHContainer; }
|
|
const MCLOHContainer &getLOHContainer() const {
|
|
return const_cast<MCAssembler *>(this)->getLOHContainer();
|
|
}
|
|
/// @}
|
|
/// \name Backend Data Access
|
|
/// @{
|
|
|
|
bool registerSection(MCSection &Section) {
|
|
if (Section.isRegistered())
|
|
return false;
|
|
Sections.push_back(&Section);
|
|
Section.setIsRegistered(true);
|
|
return true;
|
|
}
|
|
|
|
void registerSymbol(const MCSymbol &Symbol, bool *Created = nullptr);
|
|
|
|
ArrayRef<std::string> getFileNames() { return FileNames; }
|
|
|
|
void addFileName(StringRef FileName) {
|
|
if (std::find(FileNames.begin(), FileNames.end(), FileName) ==
|
|
FileNames.end())
|
|
FileNames.push_back(FileName);
|
|
}
|
|
|
|
/// \brief Write the necessary bundle padding to the given object writer.
|
|
/// Expects a fragment \p F containing instructions and its size \p FSize.
|
|
void writeFragmentPadding(const MCFragment &F, uint64_t FSize,
|
|
MCObjectWriter *OW) const;
|
|
|
|
/// @}
|
|
|
|
void dump();
|
|
};
|
|
|
|
/// \brief Compute the amount of padding required before the fragment \p F to
|
|
/// obey bundling restrictions, where \p FOffset is the fragment's offset in
|
|
/// its section and \p FSize is the fragment's size.
|
|
uint64_t computeBundlePadding(const MCAssembler &Assembler, const MCFragment *F,
|
|
uint64_t FOffset, uint64_t FSize);
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif
|