mirror of
https://github.com/c64scene-ar/llvm-6502.git
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85f2ecc697
actuall addresses in a .o file, so it is better to let the MachO writer compute it. This is good for two reasons. First, areas that shouldn't care about addresses now don't have access to it. Second, the layout of each section is independent. I should use this in a subsequent commit to speed it up. Most of the patch is just removing the section address computation. The two interesting parts are the change on how we handle padding in the end of sections and how MachO can get the address of a-b when a and b are in different sections. Since now the expression evaluation normally doesn't know the section address, it will think that a-b needs relocation and let the MachO writer know. Once it has computed the section addresses, it calls back the expression evaluation with the section addresses to resolve these expressions. The remaining problem is the handling of padding. Currently it will create a special alignment fragment at the end. Since that fragment doesn't update the alignment of the section, it needs the real address to be computed. Since now the layout will not compute a-b with a and b in different sections, the only effect that the special alignment fragment has is update the address size of the section. This can also be done by the MachO writer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121076 91177308-0d34-0410-b5e6-96231b3b80d8
435 lines
13 KiB
C++
435 lines
13 KiB
C++
//===- MCExpr.h - Assembly Level Expressions --------------------*- 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_MCEXPR_H
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#define LLVM_MC_MCEXPR_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/DataTypes.h"
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namespace llvm {
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class MCAsmInfo;
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class MCAsmLayout;
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class MCAssembler;
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class MCContext;
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class MCSectionData;
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class MCSymbol;
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class MCValue;
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class raw_ostream;
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class StringRef;
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typedef DenseMap<const MCSectionData*, uint64_t> SectionAddrMap;
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/// MCExpr - Base class for the full range of assembler expressions which are
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/// needed for parsing.
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class MCExpr {
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public:
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enum ExprKind {
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Binary, ///< Binary expressions.
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Constant, ///< Constant expressions.
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SymbolRef, ///< References to labels and assigned expressions.
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Unary, ///< Unary expressions.
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Target ///< Target specific expression.
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};
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private:
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ExprKind Kind;
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MCExpr(const MCExpr&); // DO NOT IMPLEMENT
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void operator=(const MCExpr&); // DO NOT IMPLEMENT
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bool EvaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm,
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const MCAsmLayout *Layout,
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const SectionAddrMap *Addrs) const;
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protected:
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explicit MCExpr(ExprKind _Kind) : Kind(_Kind) {}
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bool EvaluateAsRelocatableImpl(MCValue &Res, const MCAssembler *Asm,
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const MCAsmLayout *Layout,
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const SectionAddrMap *Addrs,
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bool InSet) const;
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public:
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/// @name Accessors
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/// @{
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ExprKind getKind() const { return Kind; }
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/// @}
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/// @name Utility Methods
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/// @{
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void print(raw_ostream &OS) const;
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void dump() const;
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/// @}
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/// @name Expression Evaluation
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/// @{
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/// EvaluateAsAbsolute - Try to evaluate the expression to an absolute value.
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///
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/// @param Res - The absolute value, if evaluation succeeds.
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/// @param Layout - The assembler layout object to use for evaluating symbol
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/// values. If not given, then only non-symbolic expressions will be
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/// evaluated.
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/// @result - True on success.
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bool EvaluateAsAbsolute(int64_t &Res) const;
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bool EvaluateAsAbsolute(int64_t &Res, const MCAssembler &Asm) const;
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bool EvaluateAsAbsolute(int64_t &Res, const MCAsmLayout &Layout) const;
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bool EvaluateAsAbsolute(int64_t &Res, const MCAsmLayout &Layout,
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const SectionAddrMap &Addrs) const;
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/// EvaluateAsRelocatable - Try to evaluate the expression to a relocatable
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/// value, i.e. an expression of the fixed form (a - b + constant).
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///
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/// @param Res - The relocatable value, if evaluation succeeds.
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/// @param Layout - The assembler layout object to use for evaluating values.
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/// @result - True on success.
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bool EvaluateAsRelocatable(MCValue &Res, const MCAsmLayout *Layout = 0) const;
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/// @}
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static bool classof(const MCExpr *) { return true; }
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};
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inline raw_ostream &operator<<(raw_ostream &OS, const MCExpr &E) {
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E.print(OS);
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return OS;
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}
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//// MCConstantExpr - Represent a constant integer expression.
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class MCConstantExpr : public MCExpr {
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int64_t Value;
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explicit MCConstantExpr(int64_t _Value)
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: MCExpr(MCExpr::Constant), Value(_Value) {}
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public:
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/// @name Construction
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/// @{
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static const MCConstantExpr *Create(int64_t Value, MCContext &Ctx);
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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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/// @}
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static bool classof(const MCExpr *E) {
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return E->getKind() == MCExpr::Constant;
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}
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static bool classof(const MCConstantExpr *) { return true; }
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};
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/// MCSymbolRefExpr - Represent a reference to a symbol from inside an
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/// expression.
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///
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/// A symbol reference in an expression may be a use of a label, a use of an
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/// assembler variable (defined constant), or constitute an implicit definition
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/// of the symbol as external.
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class MCSymbolRefExpr : public MCExpr {
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public:
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enum VariantKind {
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VK_None,
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VK_Invalid,
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VK_GOT,
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VK_GOTOFF,
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VK_GOTPCREL,
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VK_GOTTPOFF,
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VK_INDNTPOFF,
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VK_NTPOFF,
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VK_GOTNTPOFF,
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VK_PLT,
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VK_TLSGD,
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VK_TLSLD,
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VK_TLSLDM,
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VK_TPOFF,
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VK_DTPOFF,
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VK_TLVP, // Mach-O thread local variable relocation
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VK_ARM_HI16, // The R_ARM_MOVT_ABS relocation (:upper16: in the .s file)
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VK_ARM_LO16, // The R_ARM_MOVW_ABS_NC relocation (:lower16: in the .w file)
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// FIXME: We'd really like to use the generic Kinds listed above for these.
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VK_ARM_PLT, // ARM-style PLT references. i.e., (PLT) instead of @PLT
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VK_ARM_TLSGD, // ditto for TLSGD, GOT, GOTOFF, TPOFF and GOTTPOFF
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VK_ARM_GOT,
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VK_ARM_GOTOFF,
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VK_ARM_TPOFF,
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VK_ARM_GOTTPOFF,
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VK_PPC_TOC,
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VK_PPC_HA16, // ha16(symbol)
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VK_PPC_LO16 // lo16(symbol)
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};
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private:
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/// The symbol being referenced.
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const MCSymbol *Symbol;
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/// The symbol reference modifier.
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const VariantKind Kind;
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explicit MCSymbolRefExpr(const MCSymbol *_Symbol, VariantKind _Kind)
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: MCExpr(MCExpr::SymbolRef), Symbol(_Symbol), Kind(_Kind) {}
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public:
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/// @name Construction
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/// @{
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static const MCSymbolRefExpr *Create(const MCSymbol *Symbol, MCContext &Ctx) {
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return MCSymbolRefExpr::Create(Symbol, VK_None, Ctx);
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}
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static const MCSymbolRefExpr *Create(const MCSymbol *Symbol, VariantKind Kind,
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MCContext &Ctx);
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static const MCSymbolRefExpr *Create(StringRef Name, VariantKind Kind,
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MCContext &Ctx);
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/// @}
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/// @name Accessors
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/// @{
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const MCSymbol &getSymbol() const { return *Symbol; }
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VariantKind getKind() const { return Kind; }
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/// @}
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/// @name Static Utility Functions
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/// @{
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static StringRef getVariantKindName(VariantKind Kind);
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static VariantKind getVariantKindForName(StringRef Name);
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/// @}
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static bool classof(const MCExpr *E) {
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return E->getKind() == MCExpr::SymbolRef;
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}
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static bool classof(const MCSymbolRefExpr *) { return true; }
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};
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/// MCUnaryExpr - Unary assembler expressions.
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class MCUnaryExpr : public MCExpr {
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public:
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enum Opcode {
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LNot, ///< Logical negation.
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Minus, ///< Unary minus.
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Not, ///< Bitwise negation.
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Plus ///< Unary plus.
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};
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private:
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Opcode Op;
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const MCExpr *Expr;
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MCUnaryExpr(Opcode _Op, const MCExpr *_Expr)
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: MCExpr(MCExpr::Unary), Op(_Op), Expr(_Expr) {}
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public:
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/// @name Construction
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/// @{
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static const MCUnaryExpr *Create(Opcode Op, const MCExpr *Expr,
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MCContext &Ctx);
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static const MCUnaryExpr *CreateLNot(const MCExpr *Expr, MCContext &Ctx) {
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return Create(LNot, Expr, Ctx);
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}
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static const MCUnaryExpr *CreateMinus(const MCExpr *Expr, MCContext &Ctx) {
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return Create(Minus, Expr, Ctx);
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}
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static const MCUnaryExpr *CreateNot(const MCExpr *Expr, MCContext &Ctx) {
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return Create(Not, Expr, Ctx);
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}
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static const MCUnaryExpr *CreatePlus(const MCExpr *Expr, MCContext &Ctx) {
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return Create(Plus, Expr, Ctx);
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}
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/// @}
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/// @name Accessors
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/// @{
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/// getOpcode - Get the kind of this unary expression.
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Opcode getOpcode() const { return Op; }
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/// getSubExpr - Get the child of this unary expression.
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const MCExpr *getSubExpr() const { return Expr; }
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/// @}
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static bool classof(const MCExpr *E) {
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return E->getKind() == MCExpr::Unary;
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}
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static bool classof(const MCUnaryExpr *) { return true; }
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};
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/// MCBinaryExpr - Binary assembler expressions.
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class MCBinaryExpr : public MCExpr {
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public:
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enum Opcode {
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Add, ///< Addition.
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And, ///< Bitwise and.
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Div, ///< Signed division.
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EQ, ///< Equality comparison.
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GT, ///< Signed greater than comparison (result is either 0 or some
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///< target-specific non-zero value)
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GTE, ///< Signed greater than or equal comparison (result is either 0 or
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///< some target-specific non-zero value).
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LAnd, ///< Logical and.
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LOr, ///< Logical or.
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LT, ///< Signed less than comparison (result is either 0 or
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///< some target-specific non-zero value).
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LTE, ///< Signed less than or equal comparison (result is either 0 or
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///< some target-specific non-zero value).
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Mod, ///< Signed remainder.
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Mul, ///< Multiplication.
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NE, ///< Inequality comparison.
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Or, ///< Bitwise or.
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Shl, ///< Shift left.
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Shr, ///< Shift right (arithmetic or logical, depending on target)
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Sub, ///< Subtraction.
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Xor ///< Bitwise exclusive or.
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};
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private:
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Opcode Op;
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const MCExpr *LHS, *RHS;
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MCBinaryExpr(Opcode _Op, const MCExpr *_LHS, const MCExpr *_RHS)
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: MCExpr(MCExpr::Binary), Op(_Op), LHS(_LHS), RHS(_RHS) {}
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public:
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/// @name Construction
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/// @{
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static const MCBinaryExpr *Create(Opcode Op, const MCExpr *LHS,
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const MCExpr *RHS, MCContext &Ctx);
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static const MCBinaryExpr *CreateAdd(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(Add, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateAnd(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(And, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateDiv(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(Div, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateEQ(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(EQ, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateGT(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(GT, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateGTE(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(GTE, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateLAnd(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(LAnd, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateLOr(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(LOr, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateLT(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(LT, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateLTE(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(LTE, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateMod(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(Mod, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateMul(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(Mul, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateNE(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(NE, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateOr(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(Or, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateShl(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(Shl, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateShr(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(Shr, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateSub(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(Sub, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateXor(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(Xor, LHS, RHS, Ctx);
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}
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/// @}
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/// @name Accessors
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/// @{
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/// getOpcode - Get the kind of this binary expression.
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Opcode getOpcode() const { return Op; }
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/// getLHS - Get the left-hand side expression of the binary operator.
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const MCExpr *getLHS() const { return LHS; }
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/// getRHS - Get the right-hand side expression of the binary operator.
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const MCExpr *getRHS() const { return RHS; }
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/// @}
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static bool classof(const MCExpr *E) {
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return E->getKind() == MCExpr::Binary;
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}
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static bool classof(const MCBinaryExpr *) { return true; }
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};
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/// MCTargetExpr - This is an extension point for target-specific MCExpr
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/// subclasses to implement.
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///
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/// NOTE: All subclasses are required to have trivial destructors because
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/// MCExprs are bump pointer allocated and not destructed.
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class MCTargetExpr : public MCExpr {
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virtual void Anchor();
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protected:
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MCTargetExpr() : MCExpr(Target) {}
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virtual ~MCTargetExpr() {}
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public:
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virtual void PrintImpl(raw_ostream &OS) const = 0;
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virtual bool EvaluateAsRelocatableImpl(MCValue &Res,
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const MCAsmLayout *Layout) const = 0;
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static bool classof(const MCExpr *E) {
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return E->getKind() == MCExpr::Target;
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}
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static bool classof(const MCTargetExpr *) { return true; }
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};
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} // end namespace llvm
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#endif
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