ARMMCExpr.cpp revision 226584 
1//===-- ARMMCExpr.cpp - ARM specific MC expression classes ----------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#define DEBUG_TYPE "armmcexpr"
11#include "ARMMCExpr.h"
12#include "llvm/MC/MCContext.h"
13#include "llvm/MC/MCAssembler.h"
14using namespace llvm;
15
16const ARMMCExpr*
17ARMMCExpr::Create(VariantKind Kind, const MCExpr *Expr,
18                       MCContext &Ctx) {
19  return new (Ctx) ARMMCExpr(Kind, Expr);
20}
21
22void ARMMCExpr::PrintImpl(raw_ostream &OS) const {
23  switch (Kind) {
24  default: assert(0 && "Invalid kind!");
25  case VK_ARM_HI16: OS << ":upper16:"; break;
26  case VK_ARM_LO16: OS << ":lower16:"; break;
27  }
28
29  const MCExpr *Expr = getSubExpr();
30  if (Expr->getKind() != MCExpr::SymbolRef)
31    OS << '(';
32  Expr->print(OS);
33  if (Expr->getKind() != MCExpr::SymbolRef)
34    OS << ')';
35}
36
37bool
38ARMMCExpr::EvaluateAsRelocatableImpl(MCValue &Res,
39                                     const MCAsmLayout *Layout) const {
40  return false;
41}
42
43// FIXME: This basically copies MCObjectStreamer::AddValueSymbols. Perhaps
44// that method should be made public?
45static void AddValueSymbols_(const MCExpr *Value, MCAssembler *Asm) {
46  switch (Value->getKind()) {
47  case MCExpr::Target:
48    assert(0 && "Can't handle nested target expr!");
49    break;
50
51  case MCExpr::Constant:
52    break;
53
54  case MCExpr::Binary: {
55    const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
56    AddValueSymbols_(BE->getLHS(), Asm);
57    AddValueSymbols_(BE->getRHS(), Asm);
58    break;
59  }
60
61  case MCExpr::SymbolRef:
62    Asm->getOrCreateSymbolData(cast<MCSymbolRefExpr>(Value)->getSymbol());
63    break;
64
65  case MCExpr::Unary:
66    AddValueSymbols_(cast<MCUnaryExpr>(Value)->getSubExpr(), Asm);
67    break;
68  }
69}
70
71void ARMMCExpr::AddValueSymbols(MCAssembler *Asm) const {
72  AddValueSymbols_(getSubExpr(), Asm);
73}
74