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0a4fdc82f4
This is principally to allow neater mapping of fixups to relocations in ARM64 ELF. Without this, there isn't enough information available to GetRelocType, leading to many more fixup_arm64_... enumerators. llvm-svn: 205085
89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
//===-- llvm/MC/MCValue.h - MCValue class -----------------------*- 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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//
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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/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 MCSymbol;
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class MCSymbolRefExpr;
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class raw_ostream;
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/// MCValue - This represents an "assembler immediate". In its most
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/// general form, this can hold ":Kind:(SymbolA - SymbolB + imm64)".
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/// 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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/// In the general form, SymbolB can only be defined if SymbolA is, and both
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/// must be in the same (non-external) section. The latter constraint is not
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/// enforced, since a symbol's section may not be known at construction.
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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, *SymB;
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int64_t Cst;
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uint32_t RefKind;
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public:
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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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/// isAbsolute - Is this an absolute (as opposed to relocatable) value.
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bool isAbsolute() const { return !SymA && !SymB; }
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/// print - Print the value to the stream \p OS.
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void print(raw_ostream &OS, const MCAsmInfo *MAI) const;
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/// dump - Print the value to stderr.
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void dump() const;
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static MCValue get(const MCSymbolRefExpr *SymA, const MCSymbolRefExpr *SymB=0,
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int64_t Val = 0, uint32_t RefKind = 0) {
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MCValue R;
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assert((!SymB || SymA) && "Invalid relocatable MCValue!");
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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 = 0;
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R.SymB = 0;
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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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