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 #include "MipsMCExpr.h"
11 #include "llvm/MC/MCAsmInfo.h"
12 #include "llvm/MC/MCAssembler.h"
13 #include "llvm/MC/MCContext.h"
14 #include "llvm/MC/MCObjectStreamer.h"
15
16 using namespace llvm;
17
18 #define DEBUG_TYPE "mipsmcexpr"
19
isSupportedBinaryExpr(MCSymbolRefExpr::VariantKind VK,const MCBinaryExpr * BE)20 bool MipsMCExpr::isSupportedBinaryExpr(MCSymbolRefExpr::VariantKind VK,
21 const MCBinaryExpr *BE) {
22 switch (VK) {
23 case MCSymbolRefExpr::VK_Mips_ABS_LO:
24 case MCSymbolRefExpr::VK_Mips_ABS_HI:
25 case MCSymbolRefExpr::VK_Mips_HIGHER:
26 case MCSymbolRefExpr::VK_Mips_HIGHEST:
27 break;
28 default:
29 return false;
30 }
31
32 // We support expressions of the form "(sym1 binop1 sym2) binop2 const",
33 // where "binop2 const" is optional.
34 if (isa<MCBinaryExpr>(BE->getLHS())) {
35 if (!isa<MCConstantExpr>(BE->getRHS()))
36 return false;
37 BE = cast<MCBinaryExpr>(BE->getLHS());
38 }
39 return (isa<MCSymbolRefExpr>(BE->getLHS())
40 && isa<MCSymbolRefExpr>(BE->getRHS()));
41 }
42
43 const MipsMCExpr*
create(MCSymbolRefExpr::VariantKind VK,const MCExpr * Expr,MCContext & Ctx)44 MipsMCExpr::create(MCSymbolRefExpr::VariantKind VK, const MCExpr *Expr,
45 MCContext &Ctx) {
46 VariantKind Kind;
47 switch (VK) {
48 case MCSymbolRefExpr::VK_Mips_ABS_LO:
49 Kind = VK_Mips_LO;
50 break;
51 case MCSymbolRefExpr::VK_Mips_ABS_HI:
52 Kind = VK_Mips_HI;
53 break;
54 case MCSymbolRefExpr::VK_Mips_HIGHER:
55 Kind = VK_Mips_HIGHER;
56 break;
57 case MCSymbolRefExpr::VK_Mips_HIGHEST:
58 Kind = VK_Mips_HIGHEST;
59 break;
60 default:
61 llvm_unreachable("Invalid kind!");
62 }
63
64 return new (Ctx) MipsMCExpr(Kind, Expr);
65 }
66
printImpl(raw_ostream & OS,const MCAsmInfo * MAI) const67 void MipsMCExpr::printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const {
68 switch (Kind) {
69 default: llvm_unreachable("Invalid kind!");
70 case VK_Mips_LO: OS << "%lo"; break;
71 case VK_Mips_HI: OS << "%hi"; break;
72 case VK_Mips_HIGHER: OS << "%higher"; break;
73 case VK_Mips_HIGHEST: OS << "%highest"; break;
74 }
75
76 OS << '(';
77 Expr->print(OS, MAI);
78 OS << ')';
79 }
80
81 bool
evaluateAsRelocatableImpl(MCValue & Res,const MCAsmLayout * Layout,const MCFixup * Fixup) const82 MipsMCExpr::evaluateAsRelocatableImpl(MCValue &Res,
83 const MCAsmLayout *Layout,
84 const MCFixup *Fixup) const {
85 return getSubExpr()->evaluateAsRelocatable(Res, Layout, Fixup);
86 }
87
visitUsedExpr(MCStreamer & Streamer) const88 void MipsMCExpr::visitUsedExpr(MCStreamer &Streamer) const {
89 Streamer.visitUsedExpr(*getSubExpr());
90 }
91