1 //===-- llvm/MC/MCValue.h - MCValue class -----------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the declaration of the MCValue class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_MC_MCVALUE_H
15 #define LLVM_MC_MCVALUE_H
17 #include "llvm/MC/MCExpr.h"
18 #include "llvm/MC/MCSymbol.h"
19 #include "llvm/Support/DataTypes.h"
26 /// MCValue - This represents an "assembler immediate". In its most
27 /// general form, this can hold ":Kind:(SymbolA - SymbolB + imm64)".
28 /// Not all targets supports relocations of this general form, but we
29 /// need to represent this anyway.
31 /// In general both SymbolA and SymbolB will also have a modifier
32 /// analogous to the top-level Kind. Current targets are not expected
33 /// to make use of both though. The choice comes down to whether
34 /// relocation modifiers apply to the closest symbol or the whole
37 /// In the general form, SymbolB can only be defined if SymbolA is, and both
38 /// must be in the same (non-external) section. The latter constraint is not
39 /// enforced, since a symbol's section may not be known at construction.
41 /// Note that this class must remain a simple POD value class, because we need
42 /// it to live in unions etc.
44 const MCSymbolRefExpr *SymA, *SymB;
49 int64_t getConstant() const { return Cst; }
50 const MCSymbolRefExpr *getSymA() const { return SymA; }
51 const MCSymbolRefExpr *getSymB() const { return SymB; }
52 uint32_t getRefKind() const { return RefKind; }
54 /// isAbsolute - Is this an absolute (as opposed to relocatable) value.
55 bool isAbsolute() const { return !SymA && !SymB; }
57 /// print - Print the value to the stream \p OS.
58 void print(raw_ostream &OS, const MCAsmInfo *MAI) const;
60 /// dump - Print the value to stderr.
63 MCSymbolRefExpr::VariantKind getAccessVariant() const;
65 static MCValue get(const MCSymbolRefExpr *SymA,
66 const MCSymbolRefExpr *SymB = nullptr,
67 int64_t Val = 0, uint32_t RefKind = 0) {
69 assert((!SymB || SymA) && "Invalid relocatable MCValue!");
77 static MCValue get(int64_t Val) {
88 } // end namespace llvm