1 //===-- MipsMCExpr.cpp - Mips 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 "mipsmcexpr"
11 #include "MipsMCExpr.h"
12 #include "llvm/MC/MCAssembler.h"
13 #include "llvm/MC/MCContext.h"
14 #include "llvm/MC/MCAsmInfo.h"
15 
16 using namespace llvm;
17 
18 const MipsMCExpr*
19 MipsMCExpr::Create(VariantKind Kind, const MCExpr *Expr,
20                    MCContext &Ctx) {
21   return new (Ctx) MipsMCExpr(Kind, Expr);
22 }
23 
24 void MipsMCExpr::PrintImpl(raw_ostream &OS) const {
25   switch (Kind) {
26   default: llvm_unreachable("Invalid kind!");
27   case VK_Mips_ABS_LO: OS << "%lo"; break;
28   case VK_Mips_ABS_HI: OS << "%hi"; break;
29   }
30 
31   OS << '(';
32   Expr->print(OS);
33   OS << ')';
34 }
35 
36 bool
37 MipsMCExpr::EvaluateAsRelocatableImpl(MCValue &Res,
38                                       const MCAsmLayout *Layout) const {
39   if (!Layout)
40     return false;
41   return getSubExpr()->EvaluateAsRelocatable(Res, *Layout);
42 }
43 
44 // FIXME: This basically copies MCObjectStreamer::AddValueSymbols. Perhaps
45 // that method should be made public?
46 static void AddValueSymbolsImpl(const MCExpr *Value, MCAssembler *Asm) {
47   switch (Value->getKind()) {
48   case MCExpr::Target:
49     llvm_unreachable("Can't handle nested target expr!");
50 
51   case MCExpr::Constant:
52     break;
53 
54   case MCExpr::Binary: {
55     const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
56     AddValueSymbolsImpl(BE->getLHS(), Asm);
57     AddValueSymbolsImpl(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     AddValueSymbolsImpl(cast<MCUnaryExpr>(Value)->getSubExpr(), Asm);
67     break;
68   }
69 }
70 
71 void MipsMCExpr::AddValueSymbols(MCAssembler *Asm) const {
72   AddValueSymbolsImpl(getSubExpr(), Asm);
73 }
74