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gerrit-public.fairphone.software / toolchain / llvm-project / adbe02435db367785cbff52a89dda644e29b20c8 / . / llvm / lib / MC / MCExpr.cpp
blob: 992f0a756ca81485706c6f2adfba1d95fab5c800 [file] [log] [blame]
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]1//===- MCExpr.cpp - Assembly Level Expression Implementation --------------===//
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]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
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]10#include "llvm/MC/MCExpr.h"
Daniel Dunbar5376c2a2010-03-23 23:47:14 +0000[diff] [blame]11#include "llvm/ADT/Statistic.h"
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]12#include "llvm/ADT/StringSwitch.h"
David Peixotto8ad70b32013-12-04 22:43:20 +0000[diff] [blame]13#include "llvm/MC/MCAsmInfo.h"
Daniel Dunbar5c5228a2010-03-11 05:53:37 +0000[diff] [blame]14#include "llvm/MC/MCAsmLayout.h"
15#include "llvm/MC/MCAssembler.h"
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]16#include "llvm/MC/MCContext.h"
Craig Topper6e80c282012-03-26 06:58:25 +0000[diff] [blame]17#include "llvm/MC/MCObjectWriter.h"
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]18#include "llvm/MC/MCSymbol.h"
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]19#include "llvm/MC/MCValue.h"
David Greenea8cbfb82010-01-05 01:28:07 +0000[diff] [blame]20#include "llvm/Support/Debug.h"
Chandler Carruthf3e85022012-01-10 18:08:01 +0000[diff] [blame]21#include "llvm/Support/ErrorHandling.h"
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]22#include "llvm/Support/raw_ostream.h"
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]23using namespace llvm;
24
Chandler Carruthf58e3762014-04-22 03:04:17 +0000[diff] [blame]25#define DEBUG_TYPE "mcexpr"
26
Daniel Dunbar5376c2a2010-03-23 23:47:14 +0000[diff] [blame]27namespace {
28namespace stats {
29STATISTIC(MCExprEvaluate, "Number of MCExpr evaluations");
30}
31}
32
Chris Lattnerc8f77172010-01-18 00:37:40 +0000[diff] [blame]33void MCExpr::print(raw_ostream &OS) const {
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]34 switch (getKind()) {
Chris Lattner38d022e2010-02-08 19:41:07 +0000[diff] [blame]35 case MCExpr::Target:
36 return cast<MCTargetExpr>(this)->PrintImpl(OS);
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]37 case MCExpr::Constant:
38 OS << cast<MCConstantExpr>(*this).getValue();
39 return;
40
Chris Lattner22833a32009-09-08 23:20:50 +0000[diff] [blame]41 case MCExpr::SymbolRef: {
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]42 const MCSymbolRefExpr &SRE = cast<MCSymbolRefExpr>(*this);
43 const MCSymbol &Sym = SRE.getSymbol();
Chris Lattneredb9d842010-11-15 02:46:57 +0000[diff] [blame]44 // Parenthesize names that start with $ so that they don't look like
45 // absolute names.
46 bool UseParens = Sym.getName()[0] == '$';
Chris Lattneredb9d842010-11-15 02:46:57 +0000[diff] [blame]47 if (UseParens)
Chris Lattner8b5d55e2010-01-17 21:43:43 +0000[diff] [blame]48 OS << '(' << Sym << ')';
49 else
50 OS << Sym;
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]51
David Peixotto8ad70b32013-12-04 22:43:20 +0000[diff] [blame]52 if (SRE.getKind() != MCSymbolRefExpr::VK_None) {
53 if (SRE.getMCAsmInfo().useParensForSymbolVariant())
54 OS << '(' << MCSymbolRefExpr::getVariantKindName(SRE.getKind()) << ')';
55 else
56 OS << '@' << MCSymbolRefExpr::getVariantKindName(SRE.getKind());
57 }
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]58
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]59 return;
Chris Lattner22833a32009-09-08 23:20:50 +0000[diff] [blame]60 }
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]61
62 case MCExpr::Unary: {
63 const MCUnaryExpr &UE = cast<MCUnaryExpr>(*this);
64 switch (UE.getOpcode()) {
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]65 case MCUnaryExpr::LNot: OS << '!'; break;
66 case MCUnaryExpr::Minus: OS << '-'; break;
67 case MCUnaryExpr::Not: OS << '~'; break;
68 case MCUnaryExpr::Plus: OS << '+'; break;
69 }
Chris Lattnerc8f77172010-01-18 00:37:40 +0000[diff] [blame]70 OS << *UE.getSubExpr();
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]71 return;
72 }
73
74 case MCExpr::Binary: {
75 const MCBinaryExpr &BE = cast<MCBinaryExpr>(*this);
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]76
Chris Lattner3cfc5512009-09-08 06:34:07 +0000[diff] [blame]77 // Only print parens around the LHS if it is non-trivial.
78 if (isa<MCConstantExpr>(BE.getLHS()) || isa<MCSymbolRefExpr>(BE.getLHS())) {
Chris Lattnerc8f77172010-01-18 00:37:40 +0000[diff] [blame]79 OS << *BE.getLHS();
Chris Lattner3cfc5512009-09-08 06:34:07 +0000[diff] [blame]80 } else {
Chris Lattnerc8f77172010-01-18 00:37:40 +0000[diff] [blame]81 OS << '(' << *BE.getLHS() << ')';
Chris Lattner3cfc5512009-09-08 06:34:07 +0000[diff] [blame]82 }
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]83
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]84 switch (BE.getOpcode()) {
Chris Lattner7975b8f2009-09-08 06:37:35 +0000[diff] [blame]85 case MCBinaryExpr::Add:
86 // Print "X-42" instead of "X+-42".
87 if (const MCConstantExpr *RHSC = dyn_cast<MCConstantExpr>(BE.getRHS())) {
88 if (RHSC->getValue() < 0) {
89 OS << RHSC->getValue();
90 return;
91 }
92 }
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]93
Chris Lattner7975b8f2009-09-08 06:37:35 +0000[diff] [blame]94 OS << '+';
95 break;
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]96 case MCBinaryExpr::And: OS << '&'; break;
97 case MCBinaryExpr::Div: OS << '/'; break;
98 case MCBinaryExpr::EQ: OS << "=="; break;
99 case MCBinaryExpr::GT: OS << '>'; break;
100 case MCBinaryExpr::GTE: OS << ">="; break;
101 case MCBinaryExpr::LAnd: OS << "&&"; break;
102 case MCBinaryExpr::LOr: OS << "||"; break;
103 case MCBinaryExpr::LT: OS << '<'; break;
104 case MCBinaryExpr::LTE: OS << "<="; break;
105 case MCBinaryExpr::Mod: OS << '%'; break;
106 case MCBinaryExpr::Mul: OS << '*'; break;
107 case MCBinaryExpr::NE: OS << "!="; break;
108 case MCBinaryExpr::Or: OS << '|'; break;
109 case MCBinaryExpr::Shl: OS << "<<"; break;
110 case MCBinaryExpr::Shr: OS << ">>"; break;
111 case MCBinaryExpr::Sub: OS << '-'; break;
112 case MCBinaryExpr::Xor: OS << '^'; break;
113 }
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]114
Chris Lattner3cfc5512009-09-08 06:34:07 +0000[diff] [blame]115 // Only print parens around the LHS if it is non-trivial.
116 if (isa<MCConstantExpr>(BE.getRHS()) || isa<MCSymbolRefExpr>(BE.getRHS())) {
Chris Lattnerc8f77172010-01-18 00:37:40 +0000[diff] [blame]117 OS << *BE.getRHS();
Chris Lattner3cfc5512009-09-08 06:34:07 +0000[diff] [blame]118 } else {
Chris Lattnerc8f77172010-01-18 00:37:40 +0000[diff] [blame]119 OS << '(' << *BE.getRHS() << ')';
Chris Lattner3cfc5512009-09-08 06:34:07 +0000[diff] [blame]120 }
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]121 return;
122 }
123 }
124
Craig Toppera2886c22012-02-07 05:05:23 +0000[diff] [blame]125 llvm_unreachable("Invalid expression kind!");
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]126}
127
Manman Ren49d684e2012-09-12 05:06:18 +0000[diff] [blame]128#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]129void MCExpr::dump() const {
Chris Lattnerc8f77172010-01-18 00:37:40 +0000[diff] [blame]130 print(dbgs());
David Greenea8cbfb82010-01-05 01:28:07 +0000[diff] [blame]131 dbgs() << '\n';
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]132}
Manman Renc3366cc2012-09-06 19:55:56 +0000[diff] [blame]133#endif
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]134
135/* *** */
136
Chris Lattnera0020be2009-09-08 06:27:48 +0000[diff] [blame]137const MCBinaryExpr *MCBinaryExpr::Create(Opcode Opc, const MCExpr *LHS,
138 const MCExpr *RHS, MCContext &Ctx) {
Daniel Dunbarf3636452009-08-31 08:07:22 +0000[diff] [blame]139 return new (Ctx) MCBinaryExpr(Opc, LHS, RHS);
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]140}
141
Chris Lattnera0020be2009-09-08 06:27:48 +0000[diff] [blame]142const MCUnaryExpr *MCUnaryExpr::Create(Opcode Opc, const MCExpr *Expr,
143 MCContext &Ctx) {
Daniel Dunbarf3636452009-08-31 08:07:22 +0000[diff] [blame]144 return new (Ctx) MCUnaryExpr(Opc, Expr);
145}
146
147const MCConstantExpr *MCConstantExpr::Create(int64_t Value, MCContext &Ctx) {
148 return new (Ctx) MCConstantExpr(Value);
149}
150
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]151/* *** */
152
Daniel Dunbarf3636452009-08-31 08:07:22 +0000[diff] [blame]153const MCSymbolRefExpr *MCSymbolRefExpr::Create(const MCSymbol *Sym,
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]154 VariantKind Kind,
Daniel Dunbarf3636452009-08-31 08:07:22 +0000[diff] [blame]155 MCContext &Ctx) {
David Peixotto8ad70b32013-12-04 22:43:20 +0000[diff] [blame]156 return new (Ctx) MCSymbolRefExpr(Sym, Kind, Ctx.getAsmInfo());
Daniel Dunbarf3636452009-08-31 08:07:22 +0000[diff] [blame]157}
158
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]159const MCSymbolRefExpr *MCSymbolRefExpr::Create(StringRef Name, VariantKind Kind,
160 MCContext &Ctx) {
161 return Create(Ctx.GetOrCreateSymbol(Name), Kind, Ctx);
Chris Lattner6a833f62009-09-16 01:26:31 +0000[diff] [blame]162}
163
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]164StringRef MCSymbolRefExpr::getVariantKindName(VariantKind Kind) {
165 switch (Kind) {
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]166 case VK_Invalid: return "<<invalid>>";
167 case VK_None: return "<<none>>";
168
169 case VK_GOT: return "GOT";
170 case VK_GOTOFF: return "GOTOFF";
171 case VK_GOTPCREL: return "GOTPCREL";
172 case VK_GOTTPOFF: return "GOTTPOFF";
173 case VK_INDNTPOFF: return "INDNTPOFF";
174 case VK_NTPOFF: return "NTPOFF";
Rafael Espindolab3b49bb2010-10-28 14:22:44 +0000[diff] [blame]175 case VK_GOTNTPOFF: return "GOTNTPOFF";
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]176 case VK_PLT: return "PLT";
177 case VK_TLSGD: return "TLSGD";
Rafael Espindola2dbec3f2010-10-28 15:02:40 +0000[diff] [blame]178 case VK_TLSLD: return "TLSLD";
Rafael Espindola6f23eb32010-10-28 14:37:09 +0000[diff] [blame]179 case VK_TLSLDM: return "TLSLDM";
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]180 case VK_TPOFF: return "TPOFF";
Rafael Espindolae8f08be2010-10-28 14:48:59 +0000[diff] [blame]181 case VK_DTPOFF: return "DTPOFF";
Chris Lattner94f0c142010-11-14 22:22:59 +0000[diff] [blame]182 case VK_TLVP: return "TLVP";
Tim Northover00ed9962014-03-29 10:18:08 +0000[diff] [blame]183 case VK_TLVPPAGE: return "TLVPPAGE";
184 case VK_TLVPPAGEOFF: return "TLVPPAGEOFF";
185 case VK_PAGE: return "PAGE";
186 case VK_PAGEOFF: return "PAGEOFF";
187 case VK_GOTPAGE: return "GOTPAGE";
188 case VK_GOTPAGEOFF: return "GOTPAGEOFF";
Benjamin Kramer9c9e0a22013-03-30 16:21:50 +0000[diff] [blame]189 case VK_SECREL: return "SECREL32";
Rafael Espindola7fadc0e2014-03-20 02:12:01 +0000[diff] [blame]190 case VK_WEAKREF: return "WEAKREF";
David Peixotto8ad70b32013-12-04 22:43:20 +0000[diff] [blame]191 case VK_ARM_NONE: return "none";
192 case VK_ARM_TARGET1: return "target1";
193 case VK_ARM_TARGET2: return "target2";
194 case VK_ARM_PREL31: return "prel31";
Kai Nackee51c8132014-01-20 11:00:40 +0000[diff] [blame]195 case VK_ARM_TLSLDO: return "tlsldo";
Saleem Abdulrasool6e00ca82014-01-30 04:02:31 +0000[diff] [blame]196 case VK_ARM_TLSCALL: return "tlscall";
Saleem Abdulrasoola3f12bd2014-01-30 04:02:38 +0000[diff] [blame]197 case VK_ARM_TLSDESC: return "tlsdesc";
Saleem Abdulrasool56e06e82014-01-30 04:02:47 +0000[diff] [blame]198 case VK_ARM_TLSDESCSEQ: return "tlsdescseq";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]199 case VK_PPC_LO: return "l";
Ulrich Weigande67c5652013-06-21 14:42:49 +0000[diff] [blame]200 case VK_PPC_HI: return "h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]201 case VK_PPC_HA: return "ha";
Ulrich Weigande9126f52013-06-21 14:43:42 +0000[diff] [blame]202 case VK_PPC_HIGHER: return "higher";
203 case VK_PPC_HIGHERA: return "highera";
204 case VK_PPC_HIGHEST: return "highest";
205 case VK_PPC_HIGHESTA: return "highesta";
Ulrich Weigand93372b42013-06-25 16:49:50 +0000[diff] [blame]206 case VK_PPC_GOT_LO: return "got@l";
207 case VK_PPC_GOT_HI: return "got@h";
208 case VK_PPC_GOT_HA: return "got@ha";
Ulrich Weigand68e2e1b2013-06-20 22:39:42 +0000[diff] [blame]209 case VK_PPC_TOCBASE: return "tocbase";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]210 case VK_PPC_TOC: return "toc";
211 case VK_PPC_TOC_LO: return "toc@l";
Ulrich Weigand72ddbd62013-06-21 14:43:10 +0000[diff] [blame]212 case VK_PPC_TOC_HI: return "toc@h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]213 case VK_PPC_TOC_HA: return "toc@ha";
Ulrich Weigandf11efe72013-07-01 23:33:29 +0000[diff] [blame]214 case VK_PPC_DTPMOD: return "dtpmod";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]215 case VK_PPC_TPREL: return "tprel";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]216 case VK_PPC_TPREL_LO: return "tprel@l";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]217 case VK_PPC_TPREL_HI: return "tprel@h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]218 case VK_PPC_TPREL_HA: return "tprel@ha";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]219 case VK_PPC_TPREL_HIGHER: return "tprel@higher";
220 case VK_PPC_TPREL_HIGHERA: return "tprel@highera";
221 case VK_PPC_TPREL_HIGHEST: return "tprel@highest";
222 case VK_PPC_TPREL_HIGHESTA: return "tprel@highesta";
223 case VK_PPC_DTPREL: return "dtprel";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]224 case VK_PPC_DTPREL_LO: return "dtprel@l";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]225 case VK_PPC_DTPREL_HI: return "dtprel@h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]226 case VK_PPC_DTPREL_HA: return "dtprel@ha";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]227 case VK_PPC_DTPREL_HIGHER: return "dtprel@higher";
228 case VK_PPC_DTPREL_HIGHERA: return "dtprel@highera";
229 case VK_PPC_DTPREL_HIGHEST: return "dtprel@highest";
230 case VK_PPC_DTPREL_HIGHESTA: return "dtprel@highesta";
231 case VK_PPC_GOT_TPREL: return "got@tprel";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]232 case VK_PPC_GOT_TPREL_LO: return "got@tprel@l";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]233 case VK_PPC_GOT_TPREL_HI: return "got@tprel@h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]234 case VK_PPC_GOT_TPREL_HA: return "got@tprel@ha";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]235 case VK_PPC_GOT_DTPREL: return "got@dtprel";
236 case VK_PPC_GOT_DTPREL_LO: return "got@dtprel@l";
237 case VK_PPC_GOT_DTPREL_HI: return "got@dtprel@h";
238 case VK_PPC_GOT_DTPREL_HA: return "got@dtprel@ha";
Bill Schmidtca4a0c92012-12-04 16:18:08 +0000[diff] [blame]239 case VK_PPC_TLS: return "tls";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]240 case VK_PPC_GOT_TLSGD: return "got@tlsgd";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]241 case VK_PPC_GOT_TLSGD_LO: return "got@tlsgd@l";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]242 case VK_PPC_GOT_TLSGD_HI: return "got@tlsgd@h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]243 case VK_PPC_GOT_TLSGD_HA: return "got@tlsgd@ha";
Ulrich Weigand52cf8e42013-07-09 16:41:09 +0000[diff] [blame]244 case VK_PPC_TLSGD: return "tlsgd";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]245 case VK_PPC_GOT_TLSLD: return "got@tlsld";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]246 case VK_PPC_GOT_TLSLD_LO: return "got@tlsld@l";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]247 case VK_PPC_GOT_TLSLD_HI: return "got@tlsld@h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]248 case VK_PPC_GOT_TLSLD_HA: return "got@tlsld@ha";
Ulrich Weigand52cf8e42013-07-09 16:41:09 +0000[diff] [blame]249 case VK_PPC_TLSLD: return "tlsld";
Akira Hatanakae2eed962011-12-22 01:05:17 +0000[diff] [blame]250 case VK_Mips_GPREL: return "GPREL";
251 case VK_Mips_GOT_CALL: return "GOT_CALL";
252 case VK_Mips_GOT16: return "GOT16";
253 case VK_Mips_GOT: return "GOT";
254 case VK_Mips_ABS_HI: return "ABS_HI";
255 case VK_Mips_ABS_LO: return "ABS_LO";
256 case VK_Mips_TLSGD: return "TLSGD";
257 case VK_Mips_TLSLDM: return "TLSLDM";
258 case VK_Mips_DTPREL_HI: return "DTPREL_HI";
259 case VK_Mips_DTPREL_LO: return "DTPREL_LO";
260 case VK_Mips_GOTTPREL: return "GOTTPREL";
261 case VK_Mips_TPREL_HI: return "TPREL_HI";
262 case VK_Mips_TPREL_LO: return "TPREL_LO";
263 case VK_Mips_GPOFF_HI: return "GPOFF_HI";
264 case VK_Mips_GPOFF_LO: return "GPOFF_LO";
265 case VK_Mips_GOT_DISP: return "GOT_DISP";
266 case VK_Mips_GOT_PAGE: return "GOT_PAGE";
267 case VK_Mips_GOT_OFST: return "GOT_OFST";
Akira Hatanakaf73e3622012-07-21 02:15:19 +0000[diff] [blame]268 case VK_Mips_HIGHER: return "HIGHER";
269 case VK_Mips_HIGHEST: return "HIGHEST";
Akira Hatanaka64b52d82012-11-21 19:50:22 +0000[diff] [blame]270 case VK_Mips_GOT_HI16: return "GOT_HI16";
271 case VK_Mips_GOT_LO16: return "GOT_LO16";
272 case VK_Mips_CALL_HI16: return "CALL_HI16";
273 case VK_Mips_CALL_LO16: return "CALL_LO16";
Zoran Jovanovicb355e8f2014-05-27 14:58:51 +0000[diff] [blame]274 case VK_Mips_PCREL_HI16: return "PCREL_HI16";
275 case VK_Mips_PCREL_LO16: return "PCREL_LO16";
Nico Rieck1da45292013-04-10 23:28:17 +0000[diff] [blame]276 case VK_COFF_IMGREL32: return "IMGREL32";
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]277 }
Chandler Carruthf3e85022012-01-10 18:08:01 +0000[diff] [blame]278 llvm_unreachable("Invalid variant kind");
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]279}
280
281MCSymbolRefExpr::VariantKind
282MCSymbolRefExpr::getVariantKindForName(StringRef Name) {
283 return StringSwitch<VariantKind>(Name)
284 .Case("GOT", VK_GOT)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]285 .Case("got", VK_GOT)
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]286 .Case("GOTOFF", VK_GOTOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]287 .Case("gotoff", VK_GOTOFF)
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]288 .Case("GOTPCREL", VK_GOTPCREL)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]289 .Case("gotpcrel", VK_GOTPCREL)
Joerg Sonnenbergerdd18d5b2014-04-29 13:42:02 +0000[diff] [blame]290 .Case("GOT_PREL", VK_GOTPCREL)
291 .Case("got_prel", VK_GOTPCREL)
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]292 .Case("GOTTPOFF", VK_GOTTPOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]293 .Case("gottpoff", VK_GOTTPOFF)
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]294 .Case("INDNTPOFF", VK_INDNTPOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]295 .Case("indntpoff", VK_INDNTPOFF)
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]296 .Case("NTPOFF", VK_NTPOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]297 .Case("ntpoff", VK_NTPOFF)
Rafael Espindolab3b49bb2010-10-28 14:22:44 +0000[diff] [blame]298 .Case("GOTNTPOFF", VK_GOTNTPOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]299 .Case("gotntpoff", VK_GOTNTPOFF)
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]300 .Case("PLT", VK_PLT)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]301 .Case("plt", VK_PLT)
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]302 .Case("TLSGD", VK_TLSGD)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]303 .Case("tlsgd", VK_TLSGD)
Rafael Espindola2dbec3f2010-10-28 15:02:40 +0000[diff] [blame]304 .Case("TLSLD", VK_TLSLD)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]305 .Case("tlsld", VK_TLSLD)
Rafael Espindola6f23eb32010-10-28 14:37:09 +0000[diff] [blame]306 .Case("TLSLDM", VK_TLSLDM)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]307 .Case("tlsldm", VK_TLSLDM)
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]308 .Case("TPOFF", VK_TPOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]309 .Case("tpoff", VK_TPOFF)
Rafael Espindolae8f08be2010-10-28 14:48:59 +0000[diff] [blame]310 .Case("DTPOFF", VK_DTPOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]311 .Case("dtpoff", VK_DTPOFF)
Eric Christophere7b64dc2010-05-26 00:02:12 +0000[diff] [blame]312 .Case("TLVP", VK_TLVP)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]313 .Case("tlvp", VK_TLVP)
Tim Northover00ed9962014-03-29 10:18:08 +0000[diff] [blame]314 .Case("TLVPPAGE", VK_TLVPPAGE)
315 .Case("tlvppage", VK_TLVPPAGE)
316 .Case("TLVPPAGEOFF", VK_TLVPPAGEOFF)
317 .Case("tlvppageoff", VK_TLVPPAGEOFF)
318 .Case("PAGE", VK_PAGE)
319 .Case("page", VK_PAGE)
320 .Case("PAGEOFF", VK_PAGEOFF)
321 .Case("pageoff", VK_PAGEOFF)
322 .Case("GOTPAGE", VK_GOTPAGE)
323 .Case("gotpage", VK_GOTPAGE)
324 .Case("GOTPAGEOFF", VK_GOTPAGEOFF)
325 .Case("gotpageoff", VK_GOTPAGEOFF)
Nico Rieck1da45292013-04-10 23:28:17 +0000[diff] [blame]326 .Case("IMGREL", VK_COFF_IMGREL32)
327 .Case("imgrel", VK_COFF_IMGREL32)
Rafael Espindolab770f892013-04-25 19:27:05 +0000[diff] [blame]328 .Case("SECREL32", VK_SECREL)
329 .Case("secrel32", VK_SECREL)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]330 .Case("L", VK_PPC_LO)
331 .Case("l", VK_PPC_LO)
Ulrich Weigande67c5652013-06-21 14:42:49 +0000[diff] [blame]332 .Case("H", VK_PPC_HI)
333 .Case("h", VK_PPC_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]334 .Case("HA", VK_PPC_HA)
335 .Case("ha", VK_PPC_HA)
Ulrich Weigande9126f52013-06-21 14:43:42 +0000[diff] [blame]336 .Case("HIGHER", VK_PPC_HIGHER)
337 .Case("higher", VK_PPC_HIGHER)
338 .Case("HIGHERA", VK_PPC_HIGHERA)
339 .Case("highera", VK_PPC_HIGHERA)
340 .Case("HIGHEST", VK_PPC_HIGHEST)
341 .Case("highest", VK_PPC_HIGHEST)
342 .Case("HIGHESTA", VK_PPC_HIGHESTA)
343 .Case("highesta", VK_PPC_HIGHESTA)
Ulrich Weigand93372b42013-06-25 16:49:50 +0000[diff] [blame]344 .Case("GOT@L", VK_PPC_GOT_LO)
345 .Case("got@l", VK_PPC_GOT_LO)
346 .Case("GOT@H", VK_PPC_GOT_HI)
347 .Case("got@h", VK_PPC_GOT_HI)
348 .Case("GOT@HA", VK_PPC_GOT_HA)
349 .Case("got@ha", VK_PPC_GOT_HA)
Ulrich Weigand68e2e1b2013-06-20 22:39:42 +0000[diff] [blame]350 .Case("TOCBASE", VK_PPC_TOCBASE)
351 .Case("tocbase", VK_PPC_TOCBASE)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]352 .Case("TOC", VK_PPC_TOC)
353 .Case("toc", VK_PPC_TOC)
354 .Case("TOC@L", VK_PPC_TOC_LO)
355 .Case("toc@l", VK_PPC_TOC_LO)
Ulrich Weigand72ddbd62013-06-21 14:43:10 +0000[diff] [blame]356 .Case("TOC@H", VK_PPC_TOC_HI)
357 .Case("toc@h", VK_PPC_TOC_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]358 .Case("TOC@HA", VK_PPC_TOC_HA)
359 .Case("toc@ha", VK_PPC_TOC_HA)
Ulrich Weigand2c3a2192013-05-03 19:52:35 +0000[diff] [blame]360 .Case("TLS", VK_PPC_TLS)
361 .Case("tls", VK_PPC_TLS)
Ulrich Weigandf11efe72013-07-01 23:33:29 +0000[diff] [blame]362 .Case("DTPMOD", VK_PPC_DTPMOD)
363 .Case("dtpmod", VK_PPC_DTPMOD)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]364 .Case("TPREL", VK_PPC_TPREL)
365 .Case("tprel", VK_PPC_TPREL)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]366 .Case("TPREL@L", VK_PPC_TPREL_LO)
367 .Case("tprel@l", VK_PPC_TPREL_LO)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]368 .Case("TPREL@H", VK_PPC_TPREL_HI)
369 .Case("tprel@h", VK_PPC_TPREL_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]370 .Case("TPREL@HA", VK_PPC_TPREL_HA)
371 .Case("tprel@ha", VK_PPC_TPREL_HA)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]372 .Case("TPREL@HIGHER", VK_PPC_TPREL_HIGHER)
373 .Case("tprel@higher", VK_PPC_TPREL_HIGHER)
374 .Case("TPREL@HIGHERA", VK_PPC_TPREL_HIGHERA)
375 .Case("tprel@highera", VK_PPC_TPREL_HIGHERA)
376 .Case("TPREL@HIGHEST", VK_PPC_TPREL_HIGHEST)
377 .Case("tprel@highest", VK_PPC_TPREL_HIGHEST)
378 .Case("TPREL@HIGHESTA", VK_PPC_TPREL_HIGHESTA)
379 .Case("tprel@highesta", VK_PPC_TPREL_HIGHESTA)
380 .Case("DTPREL", VK_PPC_DTPREL)
381 .Case("dtprel", VK_PPC_DTPREL)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]382 .Case("DTPREL@L", VK_PPC_DTPREL_LO)
383 .Case("dtprel@l", VK_PPC_DTPREL_LO)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]384 .Case("DTPREL@H", VK_PPC_DTPREL_HI)
385 .Case("dtprel@h", VK_PPC_DTPREL_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]386 .Case("DTPREL@HA", VK_PPC_DTPREL_HA)
387 .Case("dtprel@ha", VK_PPC_DTPREL_HA)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]388 .Case("DTPREL@HIGHER", VK_PPC_DTPREL_HIGHER)
389 .Case("dtprel@higher", VK_PPC_DTPREL_HIGHER)
390 .Case("DTPREL@HIGHERA", VK_PPC_DTPREL_HIGHERA)
391 .Case("dtprel@highera", VK_PPC_DTPREL_HIGHERA)
392 .Case("DTPREL@HIGHEST", VK_PPC_DTPREL_HIGHEST)
393 .Case("dtprel@highest", VK_PPC_DTPREL_HIGHEST)
394 .Case("DTPREL@HIGHESTA", VK_PPC_DTPREL_HIGHESTA)
395 .Case("dtprel@highesta", VK_PPC_DTPREL_HIGHESTA)
396 .Case("GOT@TPREL", VK_PPC_GOT_TPREL)
397 .Case("got@tprel", VK_PPC_GOT_TPREL)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]398 .Case("GOT@TPREL@L", VK_PPC_GOT_TPREL_LO)
399 .Case("got@tprel@l", VK_PPC_GOT_TPREL_LO)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]400 .Case("GOT@TPREL@H", VK_PPC_GOT_TPREL_HI)
401 .Case("got@tprel@h", VK_PPC_GOT_TPREL_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]402 .Case("GOT@TPREL@HA", VK_PPC_GOT_TPREL_HA)
403 .Case("got@tprel@ha", VK_PPC_GOT_TPREL_HA)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]404 .Case("GOT@DTPREL", VK_PPC_GOT_DTPREL)
405 .Case("got@dtprel", VK_PPC_GOT_DTPREL)
406 .Case("GOT@DTPREL@L", VK_PPC_GOT_DTPREL_LO)
407 .Case("got@dtprel@l", VK_PPC_GOT_DTPREL_LO)
408 .Case("GOT@DTPREL@H", VK_PPC_GOT_DTPREL_HI)
409 .Case("got@dtprel@h", VK_PPC_GOT_DTPREL_HI)
410 .Case("GOT@DTPREL@HA", VK_PPC_GOT_DTPREL_HA)
411 .Case("got@dtprel@ha", VK_PPC_GOT_DTPREL_HA)
412 .Case("GOT@TLSGD", VK_PPC_GOT_TLSGD)
413 .Case("got@tlsgd", VK_PPC_GOT_TLSGD)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]414 .Case("GOT@TLSGD@L", VK_PPC_GOT_TLSGD_LO)
415 .Case("got@tlsgd@l", VK_PPC_GOT_TLSGD_LO)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]416 .Case("GOT@TLSGD@H", VK_PPC_GOT_TLSGD_HI)
417 .Case("got@tlsgd@h", VK_PPC_GOT_TLSGD_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]418 .Case("GOT@TLSGD@HA", VK_PPC_GOT_TLSGD_HA)
419 .Case("got@tlsgd@ha", VK_PPC_GOT_TLSGD_HA)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]420 .Case("GOT@TLSLD", VK_PPC_GOT_TLSLD)
421 .Case("got@tlsld", VK_PPC_GOT_TLSLD)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]422 .Case("GOT@TLSLD@L", VK_PPC_GOT_TLSLD_LO)
423 .Case("got@tlsld@l", VK_PPC_GOT_TLSLD_LO)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]424 .Case("GOT@TLSLD@H", VK_PPC_GOT_TLSLD_HI)
425 .Case("got@tlsld@h", VK_PPC_GOT_TLSLD_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]426 .Case("GOT@TLSLD@HA", VK_PPC_GOT_TLSLD_HA)
427 .Case("got@tlsld@ha", VK_PPC_GOT_TLSLD_HA)
David Peixotto8ad70b32013-12-04 22:43:20 +0000[diff] [blame]428 .Case("NONE", VK_ARM_NONE)
429 .Case("none", VK_ARM_NONE)
430 .Case("TARGET1", VK_ARM_TARGET1)
431 .Case("target1", VK_ARM_TARGET1)
432 .Case("TARGET2", VK_ARM_TARGET2)
433 .Case("target2", VK_ARM_TARGET2)
434 .Case("PREL31", VK_ARM_PREL31)
435 .Case("prel31", VK_ARM_PREL31)
Kai Nackee51c8132014-01-20 11:00:40 +0000[diff] [blame]436 .Case("TLSLDO", VK_ARM_TLSLDO)
437 .Case("tlsldo", VK_ARM_TLSLDO)
Saleem Abdulrasool6e00ca82014-01-30 04:02:31 +0000[diff] [blame]438 .Case("TLSCALL", VK_ARM_TLSCALL)
439 .Case("tlscall", VK_ARM_TLSCALL)
Saleem Abdulrasoola3f12bd2014-01-30 04:02:38 +0000[diff] [blame]440 .Case("TLSDESC", VK_ARM_TLSDESC)
441 .Case("tlsdesc", VK_ARM_TLSDESC)
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]442 .Default(VK_Invalid);
443}
444
445/* *** */
446
Craig Topper2a6a08b2012-09-26 06:36:36 +0000[diff] [blame]447void MCTargetExpr::anchor() {}
Chris Lattner6a833f62009-09-16 01:26:31 +0000[diff] [blame]448
Daniel Dunbarf3636452009-08-31 08:07:22 +0000[diff] [blame]449/* *** */
450
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]451bool MCExpr::EvaluateAsAbsolute(int64_t &Res) const {
Craig Topperbb694de2014-04-13 04:57:38 +0000[diff] [blame]452 return EvaluateAsAbsolute(Res, nullptr, nullptr, nullptr);
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]453}
454
455bool MCExpr::EvaluateAsAbsolute(int64_t &Res,
456 const MCAsmLayout &Layout) const {
Craig Topperbb694de2014-04-13 04:57:38 +0000[diff] [blame]457 return EvaluateAsAbsolute(Res, &Layout.getAssembler(), &Layout, nullptr);
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]458}
459
460bool MCExpr::EvaluateAsAbsolute(int64_t &Res,
461 const MCAsmLayout &Layout,
462 const SectionAddrMap &Addrs) const {
463 return EvaluateAsAbsolute(Res, &Layout.getAssembler(), &Layout, &Addrs);
464}
465
466bool MCExpr::EvaluateAsAbsolute(int64_t &Res, const MCAssembler &Asm) const {
Craig Topperbb694de2014-04-13 04:57:38 +0000[diff] [blame]467 return EvaluateAsAbsolute(Res, &Asm, nullptr, nullptr);
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]468}
469
Rafael Espindolaadbe0242014-08-15 14:20:32 +0000[diff] [blame^]470int64_t MCExpr::evaluateKnownAbsolute(const MCAsmLayout &Layout) const {
471 int64_t Res;
472 bool Abs =
473 evaluateAsAbsolute(Res, &Layout.getAssembler(), &Layout, nullptr, true);
474 (void)Abs;
475 assert(Abs && "Not actually absolute");
476 return Res;
477}
478
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]479bool MCExpr::EvaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm,
480 const MCAsmLayout *Layout,
Rafael Espindola93e3cf02010-12-07 00:27:36 +0000[diff] [blame]481 const SectionAddrMap *Addrs) const {
Rafael Espindolaadbe0242014-08-15 14:20:32 +0000[diff] [blame^]482 // FIXME: The use if InSet = Addrs is a hack. Setting InSet causes us
483 // absolutize differences across sections and that is what the MachO writer
484 // uses Addrs for.
485 return evaluateAsAbsolute(Res, Asm, Layout, Addrs, Addrs);
486}
487
488bool MCExpr::evaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm,
489 const MCAsmLayout *Layout,
490 const SectionAddrMap *Addrs, bool InSet) const {
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]491 MCValue Value;
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]492
Daniel Dunbar5cfb5872010-03-23 23:47:07 +0000[diff] [blame]493 // Fast path constants.
494 if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(this)) {
495 Res = CE->getValue();
496 return true;
497 }
498
Rafael Espindolaadbe0242014-08-15 14:20:32 +0000[diff] [blame^]499 bool IsRelocatable = EvaluateAsRelocatableImpl(
500 Value, Asm, Layout, nullptr, Addrs, InSet, /*ForceVarExpansion*/ false);
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]501
Rafael Espindola4124ab12010-12-22 22:16:24 +0000[diff] [blame]502 // Record the current value.
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]503 Res = Value.getConstant();
Rafael Espindola4124ab12010-12-22 22:16:24 +0000[diff] [blame]504
505 return IsRelocatable && Value.isAbsolute();
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]506}
507
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]508/// \brief Helper method for \see EvaluateSymbolAdd().
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]509static void AttemptToFoldSymbolOffsetDifference(const MCAssembler *Asm,
510 const MCAsmLayout *Layout,
511 const SectionAddrMap *Addrs,
512 bool InSet,
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]513 const MCSymbolRefExpr *&A,
514 const MCSymbolRefExpr *&B,
515 int64_t &Addend) {
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]516 if (!A || !B)
517 return;
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]518
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]519 const MCSymbol &SA = A->getSymbol();
520 const MCSymbol &SB = B->getSymbol();
521
522 if (SA.isUndefined() || SB.isUndefined())
523 return;
524
525 if (!Asm->getWriter().IsSymbolRefDifferenceFullyResolved(*Asm, A, B, InSet))
526 return;
527
David Blaikie908f4d42014-04-24 16:59:40 +0000[diff] [blame]528 const MCSymbolData &AD = Asm->getSymbolData(SA);
529 const MCSymbolData &BD = Asm->getSymbolData(SB);
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]530
531 if (AD.getFragment() == BD.getFragment()) {
532 Addend += (AD.getOffset() - BD.getOffset());
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]533
Owen Anderson97462862011-03-21 23:13:43 +0000[diff] [blame]534 // Pointers to Thumb symbols need to have their low-bit set to allow
535 // for interworking.
536 if (Asm->isThumbFunc(&SA))
537 Addend |= 1;
538
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]539 // Clear the symbol expr pointers to indicate we have folded these
540 // operands.
Craig Topperbb694de2014-04-13 04:57:38 +0000[diff] [blame]541 A = B = nullptr;
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]542 return;
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]543 }
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]544
545 if (!Layout)
546 return;
547
548 const MCSectionData &SecA = *AD.getFragment()->getParent();
549 const MCSectionData &SecB = *BD.getFragment()->getParent();
550
551 if ((&SecA != &SecB) && !Addrs)
552 return;
553
554 // Eagerly evaluate.
555 Addend += (Layout->getSymbolOffset(&Asm->getSymbolData(A->getSymbol())) -
556 Layout->getSymbolOffset(&Asm->getSymbolData(B->getSymbol())));
557 if (Addrs && (&SecA != &SecB))
558 Addend += (Addrs->lookup(&SecA) - Addrs->lookup(&SecB));
559
Jim Grosbach213039a2012-02-24 05:12:18 +0000[diff] [blame]560 // Pointers to Thumb symbols need to have their low-bit set to allow
561 // for interworking.
562 if (Asm->isThumbFunc(&SA))
563 Addend |= 1;
564
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]565 // Clear the symbol expr pointers to indicate we have folded these
566 // operands.
Craig Topperbb694de2014-04-13 04:57:38 +0000[diff] [blame]567 A = B = nullptr;
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]568}
569
Daniel Dunbar395a0992010-12-16 18:36:25 +0000[diff] [blame]570/// \brief Evaluate the result of an add between (conceptually) two MCValues.
571///
572/// This routine conceptually attempts to construct an MCValue:
573/// Result = (Result_A - Result_B + Result_Cst)
574/// from two MCValue's LHS and RHS where
575/// Result = LHS + RHS
576/// and
577/// Result = (LHS_A - LHS_B + LHS_Cst) + (RHS_A - RHS_B + RHS_Cst).
578///
579/// This routine attempts to aggresively fold the operands such that the result
580/// is representable in an MCValue, but may not always succeed.
581///
582/// \returns True on success, false if the result is not representable in an
583/// MCValue.
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]584
585/// NOTE: It is really important to have both the Asm and Layout arguments.
586/// They might look redundant, but this function can be used before layout
587/// is done (see the object streamer for example) and having the Asm argument
Rafael Espindola1ea7f182010-12-18 04:01:45 +0000[diff] [blame]588/// lets us avoid relaxations early.
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]589static bool EvaluateSymbolicAdd(const MCAssembler *Asm,
590 const MCAsmLayout *Layout,
Rafael Espindola93e3cf02010-12-07 00:27:36 +0000[diff] [blame]591 const SectionAddrMap *Addrs,
Rafael Espindola57ab7082010-12-03 00:55:40 +0000[diff] [blame]592 bool InSet,
Rafael Espindola4262a222010-10-16 18:23:53 +0000[diff] [blame]593 const MCValue &LHS,const MCSymbolRefExpr *RHS_A,
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]594 const MCSymbolRefExpr *RHS_B, int64_t RHS_Cst,
Daniel Dunbar19f847f2009-06-30 02:08:27 +0000[diff] [blame]595 MCValue &Res) {
Daniel Dunbar76793ba2010-12-17 01:07:20 +0000[diff] [blame]596 // FIXME: This routine (and other evaluation parts) are *incredibly* sloppy
597 // about dealing with modifiers. This will ultimately bite us, one day.
598 const MCSymbolRefExpr *LHS_A = LHS.getSymA();
599 const MCSymbolRefExpr *LHS_B = LHS.getSymB();
600 int64_t LHS_Cst = LHS.getConstant();
601
602 // Fold the result constant immediately.
603 int64_t Result_Cst = LHS_Cst + RHS_Cst;
604
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]605 assert((!Layout || Asm) &&
606 "Must have an assembler object if layout is given!");
607
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]608 // If we have a layout, we can fold resolved differences.
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]609 if (Asm) {
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]610 // First, fold out any differences which are fully resolved. By
611 // reassociating terms in
612 // Result = (LHS_A - LHS_B + LHS_Cst) + (RHS_A - RHS_B + RHS_Cst).
613 // we have the four possible differences:
614 // (LHS_A - LHS_B),
615 // (LHS_A - RHS_B),
616 // (RHS_A - LHS_B),
617 // (RHS_A - RHS_B).
Chris Lattner0ab5e2c2011-04-15 05:18:47 +0000[diff] [blame]618 // Since we are attempting to be as aggressive as possible about folding, we
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]619 // attempt to evaluate each possible alternative.
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]620 AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, LHS_A, LHS_B,
621 Result_Cst);
622 AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, LHS_A, RHS_B,
623 Result_Cst);
624 AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, RHS_A, LHS_B,
625 Result_Cst);
626 AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, RHS_A, RHS_B,
627 Result_Cst);
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]628 }
629
Daniel Dunbar76793ba2010-12-17 01:07:20 +0000[diff] [blame]630 // We can't represent the addition or subtraction of two symbols.
631 if ((LHS_A && RHS_A) || (LHS_B && RHS_B))
Daniel Dunbar19f847f2009-06-30 02:08:27 +0000[diff] [blame]632 return false;
633
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]634 // At this point, we have at most one additive symbol and one subtractive
635 // symbol -- find them.
Daniel Dunbar76793ba2010-12-17 01:07:20 +0000[diff] [blame]636 const MCSymbolRefExpr *A = LHS_A ? LHS_A : RHS_A;
637 const MCSymbolRefExpr *B = LHS_B ? LHS_B : RHS_B;
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]638
639 // If we have a negated symbol, then we must have also have a non-negated
640 // symbol in order to encode the expression.
641 if (B && !A)
642 return false;
Rafael Espindola4262a222010-10-16 18:23:53 +0000[diff] [blame]643
Daniel Dunbar76793ba2010-12-17 01:07:20 +0000[diff] [blame]644 Res = MCValue::get(A, B, Result_Cst);
Daniel Dunbar19f847f2009-06-30 02:08:27 +0000[diff] [blame]645 return true;
646}
647
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]648bool MCExpr::EvaluateAsRelocatable(MCValue &Res,
Joerg Sonnenberger752b91b2014-08-10 11:35:12 +0000[diff] [blame]649 const MCAsmLayout *Layout,
Joerg Sonnenbergerb696d462014-08-10 11:37:07 +0000[diff] [blame]650 const MCFixup *Fixup) const {
Craig Topperbb694de2014-04-13 04:57:38 +0000[diff] [blame]651 MCAssembler *Assembler = Layout ? &Layout->getAssembler() : nullptr;
Joerg Sonnenberger752b91b2014-08-10 11:35:12 +0000[diff] [blame]652 return EvaluateAsRelocatableImpl(Res, Assembler, Layout, Fixup, nullptr,
653 false, /*ForceVarExpansion*/ false);
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]654}
655
Joerg Sonnenberger752b91b2014-08-10 11:35:12 +0000[diff] [blame]656bool MCExpr::EvaluateAsValue(MCValue &Res, const MCAsmLayout *Layout,
657 const MCFixup *Fixup) const {
Rafael Espindolabc91d7e2014-04-28 20:53:11 +0000[diff] [blame]658 MCAssembler *Assembler = Layout ? &Layout->getAssembler() : nullptr;
Joerg Sonnenberger752b91b2014-08-10 11:35:12 +0000[diff] [blame]659 return EvaluateAsRelocatableImpl(Res, Assembler, Layout, Fixup, nullptr,
660 false, /*ForceVarExpansion*/ true);
Rafael Espindolabc91d7e2014-04-28 20:53:11 +0000[diff] [blame]661}
662
663bool MCExpr::EvaluateAsRelocatableImpl(MCValue &Res, const MCAssembler *Asm,
Rafael Espindola4262a222010-10-16 18:23:53 +0000[diff] [blame]664 const MCAsmLayout *Layout,
Joerg Sonnenberger752b91b2014-08-10 11:35:12 +0000[diff] [blame]665 const MCFixup *Fixup,
Rafael Espindolabc91d7e2014-04-28 20:53:11 +0000[diff] [blame]666 const SectionAddrMap *Addrs, bool InSet,
667 bool ForceVarExpansion) const {
Daniel Dunbar5376c2a2010-03-23 23:47:14 +0000[diff] [blame]668 ++stats::MCExprEvaluate;
669
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]670 switch (getKind()) {
Chris Lattner38d022e2010-02-08 19:41:07 +0000[diff] [blame]671 case Target:
Joerg Sonnenberger752b91b2014-08-10 11:35:12 +0000[diff] [blame]672 return cast<MCTargetExpr>(this)->EvaluateAsRelocatableImpl(Res, Layout,
673 Fixup);
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]674
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]675 case Constant:
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]676 Res = MCValue::get(cast<MCConstantExpr>(this)->getValue());
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]677 return true;
678
679 case SymbolRef: {
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]680 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(this);
681 const MCSymbol &Sym = SRE->getSymbol();
Rafael Espindola7fadc0e2014-03-20 02:12:01 +0000[diff] [blame]682 const MCAsmInfo &MCAsmInfo = SRE->getMCAsmInfo();
Daniel Dunbar17b90272009-10-16 01:33:57 +0000[diff] [blame]683
684 // Evaluate recursively if this is a variable.
Rafael Espindola3d082fa2014-05-03 19:57:04 +0000[diff] [blame]685 if (Sym.isVariable() && SRE->getKind() == MCSymbolRefExpr::VK_None) {
Rafael Espindolabc91d7e2014-04-28 20:53:11 +0000[diff] [blame]686 if (Sym.getVariableValue()->EvaluateAsRelocatableImpl(
Joerg Sonnenberger752b91b2014-08-10 11:35:12 +0000[diff] [blame]687 Res, Asm, Layout, Fixup, Addrs, true, ForceVarExpansion)) {
Rafael Espindola7fadc0e2014-03-20 02:12:01 +0000[diff] [blame]688 const MCSymbolRefExpr *A = Res.getSymA();
689 const MCSymbolRefExpr *B = Res.getSymB();
690
691 if (MCAsmInfo.hasSubsectionsViaSymbols()) {
692 // FIXME: This is small hack. Given
693 // a = b + 4
694 // .long a
695 // the OS X assembler will completely drop the 4. We should probably
696 // include it in the relocation or produce an error if that is not
697 // possible.
698 if (!A && !B)
699 return true;
700 } else {
Rafael Espindolabc91d7e2014-04-28 20:53:11 +0000[diff] [blame]701 if (ForceVarExpansion)
702 return true;
Rafael Espindola7fadc0e2014-03-20 02:12:01 +0000[diff] [blame]703 bool IsSymbol = A && A->getSymbol().isDefined();
Rafael Espindolabc91d7e2014-04-28 20:53:11 +0000[diff] [blame]704 if (!IsSymbol)
Rafael Espindola7fadc0e2014-03-20 02:12:01 +0000[diff] [blame]705 return true;
706 }
707 }
Rafael Espindola8c3039b2010-11-15 16:33:49 +0000[diff] [blame]708 }
Daniel Dunbar17b90272009-10-16 01:33:57 +0000[diff] [blame]709
Craig Topperbb694de2014-04-13 04:57:38 +0000[diff] [blame]710 Res = MCValue::get(SRE, nullptr, 0);
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]711 return true;
712 }
713
714 case Unary: {
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]715 const MCUnaryExpr *AUE = cast<MCUnaryExpr>(this);
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]716 MCValue Value;
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]717
Joerg Sonnenberger752b91b2014-08-10 11:35:12 +0000[diff] [blame]718 if (!AUE->getSubExpr()->EvaluateAsRelocatableImpl(Value, Asm, Layout,
719 Fixup, Addrs, InSet,
Joerg Sonnenbergerb696d462014-08-10 11:37:07 +0000[diff] [blame]720 ForceVarExpansion))
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]721 return false;
722
723 switch (AUE->getOpcode()) {
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]724 case MCUnaryExpr::LNot:
Daniel Dunbar0d5fc9a2009-07-01 06:48:00 +0000[diff] [blame]725 if (!Value.isAbsolute())
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]726 return false;
727 Res = MCValue::get(!Value.getConstant());
728 break;
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]729 case MCUnaryExpr::Minus:
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]730 /// -(a - b + const) ==> (b - a - const)
Daniel Dunbar7f8a9eb2009-08-11 17:47:52 +0000[diff] [blame]731 if (Value.getSymA() && !Value.getSymB())
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]732 return false;
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]733 Res = MCValue::get(Value.getSymB(), Value.getSymA(),
734 -Value.getConstant());
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]735 break;
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]736 case MCUnaryExpr::Not:
Daniel Dunbar0d5fc9a2009-07-01 06:48:00 +0000[diff] [blame]737 if (!Value.isAbsolute())
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]738 return false;
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]739 Res = MCValue::get(~Value.getConstant());
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]740 break;
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]741 case MCUnaryExpr::Plus:
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]742 Res = Value;
743 break;
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]744 }
745
746 return true;
747 }
748
749 case Binary: {
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]750 const MCBinaryExpr *ABE = cast<MCBinaryExpr>(this);
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]751 MCValue LHSValue, RHSValue;
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]752
Joerg Sonnenberger752b91b2014-08-10 11:35:12 +0000[diff] [blame]753 if (!ABE->getLHS()->EvaluateAsRelocatableImpl(LHSValue, Asm, Layout,
754 Fixup, Addrs, InSet,
Joerg Sonnenbergerb696d462014-08-10 11:37:07 +0000[diff] [blame]755 ForceVarExpansion) ||
Joerg Sonnenberger752b91b2014-08-10 11:35:12 +0000[diff] [blame]756 !ABE->getRHS()->EvaluateAsRelocatableImpl(RHSValue, Asm, Layout,
757 Fixup, Addrs, InSet,
Joerg Sonnenbergerb696d462014-08-10 11:37:07 +0000[diff] [blame]758 ForceVarExpansion))
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]759 return false;
760
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]761 // We only support a few operations on non-constant expressions, handle
762 // those first.
Daniel Dunbar0d5fc9a2009-07-01 06:48:00 +0000[diff] [blame]763 if (!LHSValue.isAbsolute() || !RHSValue.isAbsolute()) {
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]764 switch (ABE->getOpcode()) {
765 default:
766 return false;
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]767 case MCBinaryExpr::Sub:
Daniel Dunbar19f847f2009-06-30 02:08:27 +0000[diff] [blame]768 // Negate RHS and add.
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]769 return EvaluateSymbolicAdd(Asm, Layout, Addrs, InSet, LHSValue,
Daniel Dunbar19f847f2009-06-30 02:08:27 +0000[diff] [blame]770 RHSValue.getSymB(), RHSValue.getSymA(),
771 -RHSValue.getConstant(),
772 Res);
773
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]774 case MCBinaryExpr::Add:
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]775 return EvaluateSymbolicAdd(Asm, Layout, Addrs, InSet, LHSValue,
Daniel Dunbar19f847f2009-06-30 02:08:27 +0000[diff] [blame]776 RHSValue.getSymA(), RHSValue.getSymB(),
777 RHSValue.getConstant(),
778 Res);
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]779 }
780 }
781
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]782 // FIXME: We need target hooks for the evaluation. It may be limited in
Dan Gohman9a9d9ea2010-02-08 23:58:47 +0000[diff] [blame]783 // width, and gas defines the result of comparisons and right shifts
784 // differently from Apple as.
Daniel Dunbar39712732009-06-30 16:02:47 +0000[diff] [blame]785 int64_t LHS = LHSValue.getConstant(), RHS = RHSValue.getConstant();
786 int64_t Result = 0;
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]787 switch (ABE->getOpcode()) {
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]788 case MCBinaryExpr::Add: Result = LHS + RHS; break;
789 case MCBinaryExpr::And: Result = LHS & RHS; break;
790 case MCBinaryExpr::Div: Result = LHS / RHS; break;
791 case MCBinaryExpr::EQ: Result = LHS == RHS; break;
792 case MCBinaryExpr::GT: Result = LHS > RHS; break;
793 case MCBinaryExpr::GTE: Result = LHS >= RHS; break;
794 case MCBinaryExpr::LAnd: Result = LHS && RHS; break;
795 case MCBinaryExpr::LOr: Result = LHS || RHS; break;
796 case MCBinaryExpr::LT: Result = LHS < RHS; break;
797 case MCBinaryExpr::LTE: Result = LHS <= RHS; break;
798 case MCBinaryExpr::Mod: Result = LHS % RHS; break;
799 case MCBinaryExpr::Mul: Result = LHS * RHS; break;
800 case MCBinaryExpr::NE: Result = LHS != RHS; break;
801 case MCBinaryExpr::Or: Result = LHS | RHS; break;
802 case MCBinaryExpr::Shl: Result = LHS << RHS; break;
803 case MCBinaryExpr::Shr: Result = LHS >> RHS; break;
804 case MCBinaryExpr::Sub: Result = LHS - RHS; break;
805 case MCBinaryExpr::Xor: Result = LHS ^ RHS; break;
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]806 }
807
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]808 Res = MCValue::get(Result);
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]809 return true;
810 }
811 }
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]812
Craig Toppera2886c22012-02-07 05:05:23 +0000[diff] [blame]813 llvm_unreachable("Invalid assembly expression kind!");
Daniel Dunbarf3636452009-08-31 08:07:22 +0000[diff] [blame]814}
Daniel Dunbardc3e4cc2011-04-29 18:00:03 +0000[diff] [blame]815
816const MCSection *MCExpr::FindAssociatedSection() const {
817 switch (getKind()) {
818 case Target:
819 // We never look through target specific expressions.
820 return cast<MCTargetExpr>(this)->FindAssociatedSection();
821
822 case Constant:
823 return MCSymbol::AbsolutePseudoSection;
824
825 case SymbolRef: {
826 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(this);
827 const MCSymbol &Sym = SRE->getSymbol();
828
829 if (Sym.isDefined())
830 return &Sym.getSection();
831
Craig Topperbb694de2014-04-13 04:57:38 +0000[diff] [blame]832 return nullptr;
Daniel Dunbardc3e4cc2011-04-29 18:00:03 +0000[diff] [blame]833 }
834
835 case Unary:
836 return cast<MCUnaryExpr>(this)->getSubExpr()->FindAssociatedSection();
837
838 case Binary: {
839 const MCBinaryExpr *BE = cast<MCBinaryExpr>(this);
840 const MCSection *LHS_S = BE->getLHS()->FindAssociatedSection();
841 const MCSection *RHS_S = BE->getRHS()->FindAssociatedSection();
842
843 // If either section is absolute, return the other.
844 if (LHS_S == MCSymbol::AbsolutePseudoSection)
845 return RHS_S;
846 if (RHS_S == MCSymbol::AbsolutePseudoSection)
847 return LHS_S;
848
849 // Otherwise, return the first non-null section.
850 return LHS_S ? LHS_S : RHS_S;
851 }
852 }
853
Craig Toppera2886c22012-02-07 05:05:23 +0000[diff] [blame]854 llvm_unreachable("Invalid assembly expression kind!");
Daniel Dunbardc3e4cc2011-04-29 18:00:03 +0000[diff] [blame]855}