80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
//===-- llvm/MC/MCValue.h - MCValue class -----------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the declaration of the MCValue class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCVALUE_H
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#define LLVM_MC_MCVALUE_H
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#include "llvm/MC/MCExpr.h"
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#include "llvm/Support/DataTypes.h"
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namespace llvm {
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class raw_ostream;
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// Represents a relocatable expression in its most general form:
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// relocation_specifier(SymA - SymB + imm64).
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//
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// Not all targets support SymB. For PC-relative relocations, a specifier is
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// typically used instead of setting SymB to DOT.
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//
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// This class must remain a simple POD value class, as it needs to reside in
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// unions and similar structures.
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class MCValue {
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const MCSymbol *SymA = nullptr, *SymB = nullptr;
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int64_t Cst = 0;
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uint32_t Specifier = 0;
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void print(raw_ostream &OS) const;
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/// Print the value to stderr.
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void dump() const;
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public:
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friend class MCAssembler;
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friend class MCExpr;
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MCValue() = default;
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int64_t getConstant() const { return Cst; }
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void setConstant(int64_t C) { Cst = C; }
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uint32_t getSpecifier() const { return Specifier; }
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void setSpecifier(uint32_t S) { Specifier = S; }
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const MCSymbol *getAddSym() const { return SymA; }
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void setAddSym(const MCSymbol *A) { SymA = A; }
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const MCSymbol *getSubSym() const { return SymB; }
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/// Is this an absolute (as opposed to relocatable) value.
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bool isAbsolute() const { return !SymA && !SymB; }
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static MCValue get(const MCSymbol *SymA, const MCSymbol *SymB = nullptr,
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int64_t Val = 0, uint32_t Specifier = 0) {
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MCValue R;
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R.Cst = Val;
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R.SymA = SymA;
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R.SymB = SymB;
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R.Specifier = Specifier;
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return R;
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}
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static MCValue get(int64_t Val) {
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MCValue R;
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R.Cst = Val;
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R.SymA = nullptr;
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R.SymB = nullptr;
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R.Specifier = 0;
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return R;
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}
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};
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} // end namespace llvm
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#endif
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