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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
87 lines
2.5 KiB
C++
87 lines
2.5 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/MC/MCSymbol.h"
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#include "llvm/Support/DataTypes.h"
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#include <cassert>
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namespace llvm {
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class MCAsmInfo;
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class raw_ostream;
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/// This represents an "assembler immediate".
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///
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/// In its most general form, this can hold ":Kind:(SymbolA - SymbolB +
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/// imm64)". Not all targets supports relocations of this general form, but we
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/// need to represent this anyway.
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///
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/// In general both SymbolA and SymbolB will also have a modifier
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/// analogous to the top-level Kind. Current targets are not expected
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/// to make use of both though. The choice comes down to whether
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/// relocation modifiers apply to the closest symbol or the whole
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/// expression.
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///
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/// Note that this class must remain a simple POD value class, because we need
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/// it to live in unions etc.
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class MCValue {
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const MCSymbolRefExpr *SymA = nullptr, *SymB = nullptr;
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int64_t Cst = 0;
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uint32_t RefKind = 0;
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public:
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MCValue() = default;
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int64_t getConstant() const { return Cst; }
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const MCSymbolRefExpr *getSymA() const { return SymA; }
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const MCSymbolRefExpr *getSymB() const { return SymB; }
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uint32_t getRefKind() const { return RefKind; }
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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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/// Print the value to the stream \p OS.
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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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MCSymbolRefExpr::VariantKind getAccessVariant() const;
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static MCValue get(const MCSymbolRefExpr *SymA,
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const MCSymbolRefExpr *SymB = nullptr,
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int64_t Val = 0, uint32_t RefKind = 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.RefKind = RefKind;
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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.RefKind = 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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