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Daniel Dunbar115e4d62009-08-31 08:06:59 +00001//===- MCExpr.cpp - Assembly Level Expression Implementation --------------===//
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +00002//
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
Chandler Carruth6bda14b2017-06-06 11:49:48 +000010#include "llvm/MC/MCExpr.h"
Daniel Dunbar5376c2a2010-03-23 23:47:14 +000011#include "llvm/ADT/Statistic.h"
Daniel Dunbar55992562010-03-15 23:51:06 +000012#include "llvm/ADT/StringSwitch.h"
David Peixotto8ad70b32013-12-04 22:43:20 +000013#include "llvm/MC/MCAsmInfo.h"
Daniel Dunbar5c5228a2010-03-11 05:53:37 +000014#include "llvm/MC/MCAsmLayout.h"
15#include "llvm/MC/MCAssembler.h"
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +000016#include "llvm/MC/MCContext.h"
Craig Topper6e80c282012-03-26 06:58:25 +000017#include "llvm/MC/MCObjectWriter.h"
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +000018#include "llvm/MC/MCSymbol.h"
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +000019#include "llvm/MC/MCValue.h"
Eugene Zelenko1d435522017-02-07 23:02:00 +000020#include "llvm/Support/Casting.h"
21#include "llvm/Support/Compiler.h"
David Greenea8cbfb82010-01-05 01:28:07 +000022#include "llvm/Support/Debug.h"
Chandler Carruthf3e85022012-01-10 18:08:01 +000023#include "llvm/Support/ErrorHandling.h"
Daniel Dunbarb34a2b92009-08-31 08:07:33 +000024#include "llvm/Support/raw_ostream.h"
Eugene Zelenko1d435522017-02-07 23:02:00 +000025#include <cassert>
26#include <cstdint>
27
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +000028using namespace llvm;
29
Chandler Carruthf58e3762014-04-22 03:04:17 +000030#define DEBUG_TYPE "mcexpr"
31
Daniel Dunbar5376c2a2010-03-23 23:47:14 +000032namespace {
33namespace stats {
Eugene Zelenko1d435522017-02-07 23:02:00 +000034
Daniel Dunbar5376c2a2010-03-23 23:47:14 +000035STATISTIC(MCExprEvaluate, "Number of MCExpr evaluations");
Eugene Zelenko1d435522017-02-07 23:02:00 +000036
37} // end namespace stats
38} // end anonymous namespace
Daniel Dunbar5376c2a2010-03-23 23:47:14 +000039
Daniel Sandersfe98b2f2016-05-03 13:35:44 +000040void MCExpr::print(raw_ostream &OS, const MCAsmInfo *MAI, bool InParens) const {
Daniel Dunbarb34a2b92009-08-31 08:07:33 +000041 switch (getKind()) {
Chris Lattner38d022e2010-02-08 19:41:07 +000042 case MCExpr::Target:
Matt Arsenault8b643552015-06-09 00:31:39 +000043 return cast<MCTargetExpr>(this)->printImpl(OS, MAI);
Daniel Dunbarb34a2b92009-08-31 08:07:33 +000044 case MCExpr::Constant:
45 OS << cast<MCConstantExpr>(*this).getValue();
46 return;
47
Chris Lattner22833a32009-09-08 23:20:50 +000048 case MCExpr::SymbolRef: {
Daniel Dunbar55992562010-03-15 23:51:06 +000049 const MCSymbolRefExpr &SRE = cast<MCSymbolRefExpr>(*this);
50 const MCSymbol &Sym = SRE.getSymbol();
Chris Lattneredb9d842010-11-15 02:46:57 +000051 // Parenthesize names that start with $ so that they don't look like
52 // absolute names.
Daniel Sandersfe98b2f2016-05-03 13:35:44 +000053 bool UseParens =
Eugene Zelenko1d435522017-02-07 23:02:00 +000054 !InParens && !Sym.getName().empty() && Sym.getName()[0] == '$';
Matt Arsenault8b643552015-06-09 00:31:39 +000055 if (UseParens) {
56 OS << '(';
57 Sym.print(OS, MAI);
58 OS << ')';
59 } else
60 Sym.print(OS, MAI);
Daniel Dunbar55992562010-03-15 23:51:06 +000061
Benjamin Kramerdd136432014-10-11 17:57:27 +000062 if (SRE.getKind() != MCSymbolRefExpr::VK_None)
63 SRE.printVariantKind(OS);
Daniel Dunbar55992562010-03-15 23:51:06 +000064
Daniel Dunbarb34a2b92009-08-31 08:07:33 +000065 return;
Chris Lattner22833a32009-09-08 23:20:50 +000066 }
Daniel Dunbarb34a2b92009-08-31 08:07:33 +000067
68 case MCExpr::Unary: {
69 const MCUnaryExpr &UE = cast<MCUnaryExpr>(*this);
70 switch (UE.getOpcode()) {
Daniel Dunbarb34a2b92009-08-31 08:07:33 +000071 case MCUnaryExpr::LNot: OS << '!'; break;
72 case MCUnaryExpr::Minus: OS << '-'; break;
73 case MCUnaryExpr::Not: OS << '~'; break;
74 case MCUnaryExpr::Plus: OS << '+'; break;
75 }
Matt Arsenault8b643552015-06-09 00:31:39 +000076 UE.getSubExpr()->print(OS, MAI);
Daniel Dunbarb34a2b92009-08-31 08:07:33 +000077 return;
78 }
79
80 case MCExpr::Binary: {
81 const MCBinaryExpr &BE = cast<MCBinaryExpr>(*this);
Daniel Dunbar9c64ec02010-03-18 00:59:10 +000082
Chris Lattner3cfc5512009-09-08 06:34:07 +000083 // Only print parens around the LHS if it is non-trivial.
84 if (isa<MCConstantExpr>(BE.getLHS()) || isa<MCSymbolRefExpr>(BE.getLHS())) {
Matt Arsenault8b643552015-06-09 00:31:39 +000085 BE.getLHS()->print(OS, MAI);
Chris Lattner3cfc5512009-09-08 06:34:07 +000086 } else {
Matt Arsenault8b643552015-06-09 00:31:39 +000087 OS << '(';
88 BE.getLHS()->print(OS, MAI);
89 OS << ')';
Chris Lattner3cfc5512009-09-08 06:34:07 +000090 }
Daniel Dunbar9c64ec02010-03-18 00:59:10 +000091
Daniel Dunbarb34a2b92009-08-31 08:07:33 +000092 switch (BE.getOpcode()) {
Chris Lattner7975b8f2009-09-08 06:37:35 +000093 case MCBinaryExpr::Add:
94 // Print "X-42" instead of "X+-42".
95 if (const MCConstantExpr *RHSC = dyn_cast<MCConstantExpr>(BE.getRHS())) {
96 if (RHSC->getValue() < 0) {
97 OS << RHSC->getValue();
98 return;
99 }
100 }
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000101
Chris Lattner7975b8f2009-09-08 06:37:35 +0000102 OS << '+';
103 break;
Ahmed Bougacha177c1482015-04-28 00:21:32 +0000104 case MCBinaryExpr::AShr: OS << ">>"; break;
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000105 case MCBinaryExpr::And: OS << '&'; break;
106 case MCBinaryExpr::Div: OS << '/'; break;
107 case MCBinaryExpr::EQ: OS << "=="; break;
108 case MCBinaryExpr::GT: OS << '>'; break;
109 case MCBinaryExpr::GTE: OS << ">="; break;
110 case MCBinaryExpr::LAnd: OS << "&&"; break;
111 case MCBinaryExpr::LOr: OS << "||"; break;
Ahmed Bougacha177c1482015-04-28 00:21:32 +0000112 case MCBinaryExpr::LShr: OS << ">>"; break;
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000113 case MCBinaryExpr::LT: OS << '<'; break;
114 case MCBinaryExpr::LTE: OS << "<="; break;
115 case MCBinaryExpr::Mod: OS << '%'; break;
116 case MCBinaryExpr::Mul: OS << '*'; break;
117 case MCBinaryExpr::NE: OS << "!="; break;
118 case MCBinaryExpr::Or: OS << '|'; break;
119 case MCBinaryExpr::Shl: OS << "<<"; break;
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000120 case MCBinaryExpr::Sub: OS << '-'; break;
121 case MCBinaryExpr::Xor: OS << '^'; break;
122 }
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000123
Chris Lattner3cfc5512009-09-08 06:34:07 +0000124 // Only print parens around the LHS if it is non-trivial.
125 if (isa<MCConstantExpr>(BE.getRHS()) || isa<MCSymbolRefExpr>(BE.getRHS())) {
Matt Arsenault8b643552015-06-09 00:31:39 +0000126 BE.getRHS()->print(OS, MAI);
Chris Lattner3cfc5512009-09-08 06:34:07 +0000127 } else {
Matt Arsenault8b643552015-06-09 00:31:39 +0000128 OS << '(';
129 BE.getRHS()->print(OS, MAI);
130 OS << ')';
Chris Lattner3cfc5512009-09-08 06:34:07 +0000131 }
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000132 return;
133 }
134 }
135
Craig Toppera2886c22012-02-07 05:05:23 +0000136 llvm_unreachable("Invalid expression kind!");
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000137}
138
Aaron Ballman615eb472017-10-15 14:32:27 +0000139#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
Yaron Kereneb2a2542016-01-29 20:50:44 +0000140LLVM_DUMP_METHOD void MCExpr::dump() const {
Rafael Espindolaf4a13652015-05-27 13:05:42 +0000141 dbgs() << *this;
David Greenea8cbfb82010-01-05 01:28:07 +0000142 dbgs() << '\n';
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000143}
Matthias Braun8c209aa2017-01-28 02:02:38 +0000144#endif
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000145
146/* *** */
147
Jim Grosbach13760bd2015-05-30 01:25:56 +0000148const MCBinaryExpr *MCBinaryExpr::create(Opcode Opc, const MCExpr *LHS,
Chad Rosier9245e122017-01-19 20:06:32 +0000149 const MCExpr *RHS, MCContext &Ctx,
150 SMLoc Loc) {
151 return new (Ctx) MCBinaryExpr(Opc, LHS, RHS, Loc);
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000152}
153
Jim Grosbach13760bd2015-05-30 01:25:56 +0000154const MCUnaryExpr *MCUnaryExpr::create(Opcode Opc, const MCExpr *Expr,
Sanne Wouda9dfa6ad2017-03-10 13:08:20 +0000155 MCContext &Ctx, SMLoc Loc) {
156 return new (Ctx) MCUnaryExpr(Opc, Expr, Loc);
Daniel Dunbarf3636452009-08-31 08:07:22 +0000157}
158
Jim Grosbach13760bd2015-05-30 01:25:56 +0000159const MCConstantExpr *MCConstantExpr::create(int64_t Value, MCContext &Ctx) {
Daniel Dunbarf3636452009-08-31 08:07:22 +0000160 return new (Ctx) MCConstantExpr(Value);
161}
162
Daniel Dunbar55992562010-03-15 23:51:06 +0000163/* *** */
164
Benjamin Kramerdd136432014-10-11 17:57:27 +0000165MCSymbolRefExpr::MCSymbolRefExpr(const MCSymbol *Symbol, VariantKind Kind,
Chad Rosier9245e122017-01-19 20:06:32 +0000166 const MCAsmInfo *MAI, SMLoc Loc)
167 : MCExpr(MCExpr::SymbolRef, Loc), Kind(Kind),
Benjamin Kramerdd136432014-10-11 17:57:27 +0000168 UseParensForSymbolVariant(MAI->useParensForSymbolVariant()),
169 HasSubsectionsViaSymbols(MAI->hasSubsectionsViaSymbols()),
170 Symbol(Symbol) {
171 assert(Symbol);
172}
173
Jim Grosbach13760bd2015-05-30 01:25:56 +0000174const MCSymbolRefExpr *MCSymbolRefExpr::create(const MCSymbol *Sym,
Daniel Dunbar55992562010-03-15 23:51:06 +0000175 VariantKind Kind,
Chad Rosier9245e122017-01-19 20:06:32 +0000176 MCContext &Ctx, SMLoc Loc) {
177 return new (Ctx) MCSymbolRefExpr(Sym, Kind, Ctx.getAsmInfo(), Loc);
Daniel Dunbarf3636452009-08-31 08:07:22 +0000178}
179
Jim Grosbach13760bd2015-05-30 01:25:56 +0000180const MCSymbolRefExpr *MCSymbolRefExpr::create(StringRef Name, VariantKind Kind,
Daniel Dunbar55992562010-03-15 23:51:06 +0000181 MCContext &Ctx) {
Jim Grosbach13760bd2015-05-30 01:25:56 +0000182 return create(Ctx.getOrCreateSymbol(Name), Kind, Ctx);
Chris Lattner6a833f62009-09-16 01:26:31 +0000183}
184
Daniel Dunbar55992562010-03-15 23:51:06 +0000185StringRef MCSymbolRefExpr::getVariantKindName(VariantKind Kind) {
186 switch (Kind) {
Daniel Dunbar55992562010-03-15 23:51:06 +0000187 case VK_Invalid: return "<<invalid>>";
188 case VK_None: return "<<none>>";
189
Colin LeMahieu0e051922016-02-10 18:32:01 +0000190 case VK_DTPOFF: return "DTPOFF";
191 case VK_DTPREL: return "DTPREL";
Daniel Dunbar55992562010-03-15 23:51:06 +0000192 case VK_GOT: return "GOT";
193 case VK_GOTOFF: return "GOTOFF";
Colin LeMahieuea211422016-02-09 19:17:34 +0000194 case VK_GOTREL: return "GOTREL";
Daniel Dunbar55992562010-03-15 23:51:06 +0000195 case VK_GOTPCREL: return "GOTPCREL";
196 case VK_GOTTPOFF: return "GOTTPOFF";
197 case VK_INDNTPOFF: return "INDNTPOFF";
198 case VK_NTPOFF: return "NTPOFF";
Rafael Espindolab3b49bb2010-10-28 14:22:44 +0000199 case VK_GOTNTPOFF: return "GOTNTPOFF";
Daniel Dunbar55992562010-03-15 23:51:06 +0000200 case VK_PLT: return "PLT";
201 case VK_TLSGD: return "TLSGD";
Rafael Espindola2dbec3f2010-10-28 15:02:40 +0000202 case VK_TLSLD: return "TLSLD";
Rafael Espindola6f23eb32010-10-28 14:37:09 +0000203 case VK_TLSLDM: return "TLSLDM";
Daniel Dunbar55992562010-03-15 23:51:06 +0000204 case VK_TPOFF: return "TPOFF";
Colin LeMahieu0e051922016-02-10 18:32:01 +0000205 case VK_TPREL: return "TPREL";
Davide Italiano249c45d2016-03-15 00:25:22 +0000206 case VK_TLSCALL: return "tlscall";
Davide Italianodfdf2782016-03-15 17:29:52 +0000207 case VK_TLSDESC: return "tlsdesc";
Chris Lattner94f0c142010-11-14 22:22:59 +0000208 case VK_TLVP: return "TLVP";
Tim Northover00ed9962014-03-29 10:18:08 +0000209 case VK_TLVPPAGE: return "TLVPPAGE";
210 case VK_TLVPPAGEOFF: return "TLVPPAGEOFF";
211 case VK_PAGE: return "PAGE";
212 case VK_PAGEOFF: return "PAGEOFF";
213 case VK_GOTPAGE: return "GOTPAGE";
214 case VK_GOTPAGEOFF: return "GOTPAGEOFF";
Benjamin Kramer9c9e0a22013-03-30 16:21:50 +0000215 case VK_SECREL: return "SECREL32";
Davide Italianofcae9342015-03-04 06:49:39 +0000216 case VK_SIZE: return "SIZE";
Rafael Espindola7fadc0e2014-03-20 02:12:01 +0000217 case VK_WEAKREF: return "WEAKREF";
Peter Collingbourned763c4c2017-01-31 18:28:44 +0000218 case VK_X86_ABS8: return "ABS8";
David Peixotto8ad70b32013-12-04 22:43:20 +0000219 case VK_ARM_NONE: return "none";
Peter Collingbourne97aae402015-10-26 18:23:16 +0000220 case VK_ARM_GOT_PREL: return "GOT_PREL";
David Peixotto8ad70b32013-12-04 22:43:20 +0000221 case VK_ARM_TARGET1: return "target1";
222 case VK_ARM_TARGET2: return "target2";
223 case VK_ARM_PREL31: return "prel31";
Saleem Abdulrasoolfe781972015-01-11 04:39:18 +0000224 case VK_ARM_SBREL: return "sbrel";
Kai Nackee51c8132014-01-20 11:00:40 +0000225 case VK_ARM_TLSLDO: return "tlsldo";
Saleem Abdulrasool56e06e82014-01-30 04:02:47 +0000226 case VK_ARM_TLSDESCSEQ: return "tlsdescseq";
Dylan McKayba233432017-12-09 08:01:28 +0000227 case VK_AVR_NONE: return "none";
228 case VK_AVR_LO8: return "lo8";
229 case VK_AVR_HI8: return "hi8";
230 case VK_AVR_HLO8: return "hlo8";
231 case VK_AVR_DIFF8: return "diff8";
232 case VK_AVR_DIFF16: return "diff16";
233 case VK_AVR_DIFF32: return "diff32";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000234 case VK_PPC_LO: return "l";
Ulrich Weigande67c5652013-06-21 14:42:49 +0000235 case VK_PPC_HI: return "h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000236 case VK_PPC_HA: return "ha";
Ulrich Weigande9126f52013-06-21 14:43:42 +0000237 case VK_PPC_HIGHER: return "higher";
238 case VK_PPC_HIGHERA: return "highera";
239 case VK_PPC_HIGHEST: return "highest";
240 case VK_PPC_HIGHESTA: return "highesta";
Ulrich Weigand93372b42013-06-25 16:49:50 +0000241 case VK_PPC_GOT_LO: return "got@l";
242 case VK_PPC_GOT_HI: return "got@h";
243 case VK_PPC_GOT_HA: return "got@ha";
Ulrich Weigand68e2e1b2013-06-20 22:39:42 +0000244 case VK_PPC_TOCBASE: return "tocbase";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000245 case VK_PPC_TOC: return "toc";
246 case VK_PPC_TOC_LO: return "toc@l";
Ulrich Weigand72ddbd62013-06-21 14:43:10 +0000247 case VK_PPC_TOC_HI: return "toc@h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000248 case VK_PPC_TOC_HA: return "toc@ha";
Ulrich Weigandf11efe72013-07-01 23:33:29 +0000249 case VK_PPC_DTPMOD: return "dtpmod";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000250 case VK_PPC_TPREL_LO: return "tprel@l";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000251 case VK_PPC_TPREL_HI: return "tprel@h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000252 case VK_PPC_TPREL_HA: return "tprel@ha";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000253 case VK_PPC_TPREL_HIGHER: return "tprel@higher";
254 case VK_PPC_TPREL_HIGHERA: return "tprel@highera";
255 case VK_PPC_TPREL_HIGHEST: return "tprel@highest";
256 case VK_PPC_TPREL_HIGHESTA: return "tprel@highesta";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000257 case VK_PPC_DTPREL_LO: return "dtprel@l";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000258 case VK_PPC_DTPREL_HI: return "dtprel@h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000259 case VK_PPC_DTPREL_HA: return "dtprel@ha";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000260 case VK_PPC_DTPREL_HIGHER: return "dtprel@higher";
261 case VK_PPC_DTPREL_HIGHERA: return "dtprel@highera";
262 case VK_PPC_DTPREL_HIGHEST: return "dtprel@highest";
263 case VK_PPC_DTPREL_HIGHESTA: return "dtprel@highesta";
264 case VK_PPC_GOT_TPREL: return "got@tprel";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000265 case VK_PPC_GOT_TPREL_LO: return "got@tprel@l";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000266 case VK_PPC_GOT_TPREL_HI: return "got@tprel@h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000267 case VK_PPC_GOT_TPREL_HA: return "got@tprel@ha";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000268 case VK_PPC_GOT_DTPREL: return "got@dtprel";
269 case VK_PPC_GOT_DTPREL_LO: return "got@dtprel@l";
270 case VK_PPC_GOT_DTPREL_HI: return "got@dtprel@h";
271 case VK_PPC_GOT_DTPREL_HA: return "got@dtprel@ha";
Bill Schmidtca4a0c92012-12-04 16:18:08 +0000272 case VK_PPC_TLS: return "tls";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000273 case VK_PPC_GOT_TLSGD: return "got@tlsgd";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000274 case VK_PPC_GOT_TLSGD_LO: return "got@tlsgd@l";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000275 case VK_PPC_GOT_TLSGD_HI: return "got@tlsgd@h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000276 case VK_PPC_GOT_TLSGD_HA: return "got@tlsgd@ha";
Ulrich Weigand52cf8e42013-07-09 16:41:09 +0000277 case VK_PPC_TLSGD: return "tlsgd";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000278 case VK_PPC_GOT_TLSLD: return "got@tlsld";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000279 case VK_PPC_GOT_TLSLD_LO: return "got@tlsld@l";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000280 case VK_PPC_GOT_TLSLD_HI: return "got@tlsld@h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000281 case VK_PPC_GOT_TLSLD_HA: return "got@tlsld@ha";
Ulrich Weigand52cf8e42013-07-09 16:41:09 +0000282 case VK_PPC_TLSLD: return "tlsld";
Justin Hibbitsa88b6052014-11-12 15:16:30 +0000283 case VK_PPC_LOCAL: return "local";
Reid Kleckner81782f02014-09-25 02:09:18 +0000284 case VK_COFF_IMGREL32: return "IMGREL";
Colin LeMahieub6625652015-05-01 21:14:21 +0000285 case VK_Hexagon_PCREL: return "PCREL";
286 case VK_Hexagon_LO16: return "LO16";
287 case VK_Hexagon_HI16: return "HI16";
288 case VK_Hexagon_GPREL: return "GPREL";
289 case VK_Hexagon_GD_GOT: return "GDGOT";
290 case VK_Hexagon_LD_GOT: return "LDGOT";
291 case VK_Hexagon_GD_PLT: return "GDPLT";
292 case VK_Hexagon_LD_PLT: return "LDPLT";
293 case VK_Hexagon_IE: return "IE";
294 case VK_Hexagon_IE_GOT: return "IEGOT";
Dan Gohman26c67652016-01-11 23:38:05 +0000295 case VK_WebAssembly_FUNCTION: return "FUNCTION";
Dan Gohmand934cb82017-02-24 23:18:00 +0000296 case VK_WebAssembly_TYPEINDEX: return "TYPEINDEX";
Konstantin Zhuravlyov2a2ac372016-10-14 04:21:32 +0000297 case VK_AMDGPU_GOTPCREL32_LO: return "gotpcrel32@lo";
298 case VK_AMDGPU_GOTPCREL32_HI: return "gotpcrel32@hi";
299 case VK_AMDGPU_REL32_LO: return "rel32@lo";
300 case VK_AMDGPU_REL32_HI: return "rel32@hi";
Daniel Dunbar55992562010-03-15 23:51:06 +0000301 }
Chandler Carruthf3e85022012-01-10 18:08:01 +0000302 llvm_unreachable("Invalid variant kind");
Daniel Dunbar55992562010-03-15 23:51:06 +0000303}
304
305MCSymbolRefExpr::VariantKind
306MCSymbolRefExpr::getVariantKindForName(StringRef Name) {
Roman Divackya93d0022014-12-18 23:12:34 +0000307 return StringSwitch<VariantKind>(Name.lower())
Colin LeMahieu0e051922016-02-10 18:32:01 +0000308 .Case("dtprel", VK_DTPREL)
309 .Case("dtpoff", VK_DTPOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000310 .Case("got", VK_GOT)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000311 .Case("gotoff", VK_GOTOFF)
Colin LeMahieuea211422016-02-09 19:17:34 +0000312 .Case("gotrel", VK_GOTREL)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000313 .Case("gotpcrel", VK_GOTPCREL)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000314 .Case("gottpoff", VK_GOTTPOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000315 .Case("indntpoff", VK_INDNTPOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000316 .Case("ntpoff", VK_NTPOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000317 .Case("gotntpoff", VK_GOTNTPOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000318 .Case("plt", VK_PLT)
Davide Italiano249c45d2016-03-15 00:25:22 +0000319 .Case("tlscall", VK_TLSCALL)
Davide Italianodfdf2782016-03-15 17:29:52 +0000320 .Case("tlsdesc", VK_TLSDESC)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000321 .Case("tlsgd", VK_TLSGD)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000322 .Case("tlsld", VK_TLSLD)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000323 .Case("tlsldm", VK_TLSLDM)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000324 .Case("tpoff", VK_TPOFF)
Colin LeMahieu0e051922016-02-10 18:32:01 +0000325 .Case("tprel", VK_TPREL)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000326 .Case("tlvp", VK_TLVP)
Tim Northover00ed9962014-03-29 10:18:08 +0000327 .Case("tlvppage", VK_TLVPPAGE)
Tim Northover00ed9962014-03-29 10:18:08 +0000328 .Case("tlvppageoff", VK_TLVPPAGEOFF)
Tim Northover00ed9962014-03-29 10:18:08 +0000329 .Case("page", VK_PAGE)
Tim Northover00ed9962014-03-29 10:18:08 +0000330 .Case("pageoff", VK_PAGEOFF)
Tim Northover00ed9962014-03-29 10:18:08 +0000331 .Case("gotpage", VK_GOTPAGE)
Tim Northover00ed9962014-03-29 10:18:08 +0000332 .Case("gotpageoff", VK_GOTPAGEOFF)
Nico Rieck1da45292013-04-10 23:28:17 +0000333 .Case("imgrel", VK_COFF_IMGREL32)
Rafael Espindolab770f892013-04-25 19:27:05 +0000334 .Case("secrel32", VK_SECREL)
Davide Italianofcae9342015-03-04 06:49:39 +0000335 .Case("size", VK_SIZE)
Peter Collingbourned763c4c2017-01-31 18:28:44 +0000336 .Case("abs8", VK_X86_ABS8)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000337 .Case("l", VK_PPC_LO)
Ulrich Weigande67c5652013-06-21 14:42:49 +0000338 .Case("h", VK_PPC_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000339 .Case("ha", VK_PPC_HA)
Ulrich Weigande9126f52013-06-21 14:43:42 +0000340 .Case("higher", VK_PPC_HIGHER)
Ulrich Weigande9126f52013-06-21 14:43:42 +0000341 .Case("highera", VK_PPC_HIGHERA)
Ulrich Weigande9126f52013-06-21 14:43:42 +0000342 .Case("highest", VK_PPC_HIGHEST)
Ulrich Weigande9126f52013-06-21 14:43:42 +0000343 .Case("highesta", VK_PPC_HIGHESTA)
Ulrich Weigand93372b42013-06-25 16:49:50 +0000344 .Case("got@l", VK_PPC_GOT_LO)
Ulrich Weigand93372b42013-06-25 16:49:50 +0000345 .Case("got@h", VK_PPC_GOT_HI)
Ulrich Weigand93372b42013-06-25 16:49:50 +0000346 .Case("got@ha", VK_PPC_GOT_HA)
Justin Hibbits0c0d5de2014-12-17 06:23:35 +0000347 .Case("local", VK_PPC_LOCAL)
Ulrich Weigand68e2e1b2013-06-20 22:39:42 +0000348 .Case("tocbase", VK_PPC_TOCBASE)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000349 .Case("toc", VK_PPC_TOC)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000350 .Case("toc@l", VK_PPC_TOC_LO)
Ulrich Weigand72ddbd62013-06-21 14:43:10 +0000351 .Case("toc@h", VK_PPC_TOC_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000352 .Case("toc@ha", VK_PPC_TOC_HA)
Ulrich Weigand2c3a2192013-05-03 19:52:35 +0000353 .Case("tls", VK_PPC_TLS)
Ulrich Weigandf11efe72013-07-01 23:33:29 +0000354 .Case("dtpmod", VK_PPC_DTPMOD)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000355 .Case("tprel@l", VK_PPC_TPREL_LO)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000356 .Case("tprel@h", VK_PPC_TPREL_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000357 .Case("tprel@ha", VK_PPC_TPREL_HA)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000358 .Case("tprel@higher", VK_PPC_TPREL_HIGHER)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000359 .Case("tprel@highera", VK_PPC_TPREL_HIGHERA)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000360 .Case("tprel@highest", VK_PPC_TPREL_HIGHEST)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000361 .Case("tprel@highesta", VK_PPC_TPREL_HIGHESTA)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000362 .Case("dtprel@l", VK_PPC_DTPREL_LO)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000363 .Case("dtprel@h", VK_PPC_DTPREL_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000364 .Case("dtprel@ha", VK_PPC_DTPREL_HA)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000365 .Case("dtprel@higher", VK_PPC_DTPREL_HIGHER)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000366 .Case("dtprel@highera", VK_PPC_DTPREL_HIGHERA)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000367 .Case("dtprel@highest", VK_PPC_DTPREL_HIGHEST)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000368 .Case("dtprel@highesta", VK_PPC_DTPREL_HIGHESTA)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000369 .Case("got@tprel", VK_PPC_GOT_TPREL)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000370 .Case("got@tprel@l", VK_PPC_GOT_TPREL_LO)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000371 .Case("got@tprel@h", VK_PPC_GOT_TPREL_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000372 .Case("got@tprel@ha", VK_PPC_GOT_TPREL_HA)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000373 .Case("got@dtprel", VK_PPC_GOT_DTPREL)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000374 .Case("got@dtprel@l", VK_PPC_GOT_DTPREL_LO)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000375 .Case("got@dtprel@h", VK_PPC_GOT_DTPREL_HI)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000376 .Case("got@dtprel@ha", VK_PPC_GOT_DTPREL_HA)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000377 .Case("got@tlsgd", VK_PPC_GOT_TLSGD)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000378 .Case("got@tlsgd@l", VK_PPC_GOT_TLSGD_LO)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000379 .Case("got@tlsgd@h", VK_PPC_GOT_TLSGD_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000380 .Case("got@tlsgd@ha", VK_PPC_GOT_TLSGD_HA)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000381 .Case("got@tlsld", VK_PPC_GOT_TLSLD)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000382 .Case("got@tlsld@l", VK_PPC_GOT_TLSLD_LO)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000383 .Case("got@tlsld@h", VK_PPC_GOT_TLSLD_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000384 .Case("got@tlsld@ha", VK_PPC_GOT_TLSLD_HA)
Krzysztof Parzyszeka45c0e02015-12-18 18:47:27 +0000385 .Case("gdgot", VK_Hexagon_GD_GOT)
386 .Case("gdplt", VK_Hexagon_GD_PLT)
387 .Case("iegot", VK_Hexagon_IE_GOT)
388 .Case("ie", VK_Hexagon_IE)
389 .Case("ldgot", VK_Hexagon_LD_GOT)
390 .Case("ldplt", VK_Hexagon_LD_PLT)
391 .Case("pcrel", VK_Hexagon_PCREL)
David Peixotto8ad70b32013-12-04 22:43:20 +0000392 .Case("none", VK_ARM_NONE)
Peter Collingbourne97aae402015-10-26 18:23:16 +0000393 .Case("got_prel", VK_ARM_GOT_PREL)
David Peixotto8ad70b32013-12-04 22:43:20 +0000394 .Case("target1", VK_ARM_TARGET1)
David Peixotto8ad70b32013-12-04 22:43:20 +0000395 .Case("target2", VK_ARM_TARGET2)
David Peixotto8ad70b32013-12-04 22:43:20 +0000396 .Case("prel31", VK_ARM_PREL31)
Saleem Abdulrasoolfe781972015-01-11 04:39:18 +0000397 .Case("sbrel", VK_ARM_SBREL)
Kai Nackee51c8132014-01-20 11:00:40 +0000398 .Case("tlsldo", VK_ARM_TLSLDO)
Dylan McKayba233432017-12-09 08:01:28 +0000399 .Case("lo8", VK_AVR_LO8)
400 .Case("hi8", VK_AVR_HI8)
401 .Case("hlo8", VK_AVR_HLO8)
Konstantin Zhuravlyov2a2ac372016-10-14 04:21:32 +0000402 .Case("gotpcrel32@lo", VK_AMDGPU_GOTPCREL32_LO)
403 .Case("gotpcrel32@hi", VK_AMDGPU_GOTPCREL32_HI)
404 .Case("rel32@lo", VK_AMDGPU_REL32_LO)
405 .Case("rel32@hi", VK_AMDGPU_REL32_HI)
Daniel Dunbar55992562010-03-15 23:51:06 +0000406 .Default(VK_Invalid);
407}
408
Benjamin Kramerdd136432014-10-11 17:57:27 +0000409void MCSymbolRefExpr::printVariantKind(raw_ostream &OS) const {
410 if (UseParensForSymbolVariant)
411 OS << '(' << MCSymbolRefExpr::getVariantKindName(getKind()) << ')';
412 else
413 OS << '@' << MCSymbolRefExpr::getVariantKindName(getKind());
414}
415
Daniel Dunbar55992562010-03-15 23:51:06 +0000416/* *** */
417
Craig Topper2a6a08b2012-09-26 06:36:36 +0000418void MCTargetExpr::anchor() {}
Chris Lattner6a833f62009-09-16 01:26:31 +0000419
Daniel Dunbarf3636452009-08-31 08:07:22 +0000420/* *** */
421
Jim Grosbach13760bd2015-05-30 01:25:56 +0000422bool MCExpr::evaluateAsAbsolute(int64_t &Res) const {
423 return evaluateAsAbsolute(Res, nullptr, nullptr, nullptr);
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000424}
425
Jim Grosbach13760bd2015-05-30 01:25:56 +0000426bool MCExpr::evaluateAsAbsolute(int64_t &Res,
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000427 const MCAsmLayout &Layout) const {
Jim Grosbach13760bd2015-05-30 01:25:56 +0000428 return evaluateAsAbsolute(Res, &Layout.getAssembler(), &Layout, nullptr);
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000429}
430
Jim Grosbach13760bd2015-05-30 01:25:56 +0000431bool MCExpr::evaluateAsAbsolute(int64_t &Res,
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000432 const MCAsmLayout &Layout,
433 const SectionAddrMap &Addrs) const {
Jim Grosbach13760bd2015-05-30 01:25:56 +0000434 return evaluateAsAbsolute(Res, &Layout.getAssembler(), &Layout, &Addrs);
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000435}
436
Jim Grosbach13760bd2015-05-30 01:25:56 +0000437bool MCExpr::evaluateAsAbsolute(int64_t &Res, const MCAssembler &Asm) const {
438 return evaluateAsAbsolute(Res, &Asm, nullptr, nullptr);
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000439}
440
Rafael Espindoladbb40212015-03-25 00:25:37 +0000441bool MCExpr::evaluateKnownAbsolute(int64_t &Res,
442 const MCAsmLayout &Layout) const {
443 return evaluateAsAbsolute(Res, &Layout.getAssembler(), &Layout, nullptr,
444 true);
Rafael Espindolaadbe0242014-08-15 14:20:32 +0000445}
446
Jim Grosbach13760bd2015-05-30 01:25:56 +0000447bool MCExpr::evaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm,
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000448 const MCAsmLayout *Layout,
Rafael Espindola93e3cf02010-12-07 00:27:36 +0000449 const SectionAddrMap *Addrs) const {
Rafael Espindolaadbe0242014-08-15 14:20:32 +0000450 // FIXME: The use if InSet = Addrs is a hack. Setting InSet causes us
451 // absolutize differences across sections and that is what the MachO writer
452 // uses Addrs for.
453 return evaluateAsAbsolute(Res, Asm, Layout, Addrs, Addrs);
454}
455
456bool MCExpr::evaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm,
457 const MCAsmLayout *Layout,
458 const SectionAddrMap *Addrs, bool InSet) const {
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000459 MCValue Value;
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000460
Daniel Dunbar5cfb5872010-03-23 23:47:07 +0000461 // Fast path constants.
462 if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(this)) {
463 Res = CE->getValue();
464 return true;
465 }
466
Rafael Espindolaf275ad82015-03-25 13:16:53 +0000467 bool IsRelocatable =
Jim Grosbach13760bd2015-05-30 01:25:56 +0000468 evaluateAsRelocatableImpl(Value, Asm, Layout, nullptr, Addrs, InSet);
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000469
Rafael Espindola4124ab12010-12-22 22:16:24 +0000470 // Record the current value.
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000471 Res = Value.getConstant();
Rafael Espindola4124ab12010-12-22 22:16:24 +0000472
473 return IsRelocatable && Value.isAbsolute();
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000474}
475
Daniel Dunbar137d4222010-12-17 05:50:33 +0000476/// \brief Helper method for \see EvaluateSymbolAdd().
Rafael Espindola59f90b22015-03-25 19:24:39 +0000477static void AttemptToFoldSymbolOffsetDifference(
478 const MCAssembler *Asm, const MCAsmLayout *Layout,
479 const SectionAddrMap *Addrs, bool InSet, const MCSymbolRefExpr *&A,
480 const MCSymbolRefExpr *&B, int64_t &Addend) {
Rafael Espindolaee546362010-12-19 04:18:56 +0000481 if (!A || !B)
482 return;
Daniel Dunbar137d4222010-12-17 05:50:33 +0000483
Rafael Espindolaee546362010-12-19 04:18:56 +0000484 const MCSymbol &SA = A->getSymbol();
485 const MCSymbol &SB = B->getSymbol();
486
487 if (SA.isUndefined() || SB.isUndefined())
488 return;
489
Jim Grosbach36e60e92015-06-04 22:24:41 +0000490 if (!Asm->getWriter().isSymbolRefDifferenceFullyResolved(*Asm, A, B, InSet))
Rafael Espindolaee546362010-12-19 04:18:56 +0000491 return;
492
Rafael Espindolae3a20f52015-10-05 12:07:05 +0000493 if (SA.getFragment() == SB.getFragment() && !SA.isVariable() &&
494 !SB.isVariable()) {
Rafael Espindola14672502015-05-29 17:48:04 +0000495 Addend += (SA.getOffset() - SB.getOffset());
Daniel Dunbar137d4222010-12-17 05:50:33 +0000496
Owen Anderson97462862011-03-21 23:13:43 +0000497 // Pointers to Thumb symbols need to have their low-bit set to allow
498 // for interworking.
499 if (Asm->isThumbFunc(&SA))
500 Addend |= 1;
501
Daniel Dunbar137d4222010-12-17 05:50:33 +0000502 // Clear the symbol expr pointers to indicate we have folded these
503 // operands.
Craig Topperbb694de2014-04-13 04:57:38 +0000504 A = B = nullptr;
Rafael Espindolaee546362010-12-19 04:18:56 +0000505 return;
Daniel Dunbar137d4222010-12-17 05:50:33 +0000506 }
Rafael Espindolaee546362010-12-19 04:18:56 +0000507
508 if (!Layout)
509 return;
510
Rafael Espindola4d37b2a2015-05-29 21:45:01 +0000511 const MCSection &SecA = *SA.getFragment()->getParent();
512 const MCSection &SecB = *SB.getFragment()->getParent();
Rafael Espindolaee546362010-12-19 04:18:56 +0000513
514 if ((&SecA != &SecB) && !Addrs)
515 return;
516
517 // Eagerly evaluate.
Duncan P. N. Exon Smith2a404832015-05-19 23:53:20 +0000518 Addend += Layout->getSymbolOffset(A->getSymbol()) -
519 Layout->getSymbolOffset(B->getSymbol());
Rafael Espindolaee546362010-12-19 04:18:56 +0000520 if (Addrs && (&SecA != &SecB))
Rafael Espindola079027e2015-05-26 00:52:18 +0000521 Addend += (Addrs->lookup(&SecA) - Addrs->lookup(&SecB));
Rafael Espindolaee546362010-12-19 04:18:56 +0000522
Jim Grosbach213039a2012-02-24 05:12:18 +0000523 // Pointers to Thumb symbols need to have their low-bit set to allow
524 // for interworking.
525 if (Asm->isThumbFunc(&SA))
526 Addend |= 1;
527
Rafael Espindolaee546362010-12-19 04:18:56 +0000528 // Clear the symbol expr pointers to indicate we have folded these
529 // operands.
Craig Topperbb694de2014-04-13 04:57:38 +0000530 A = B = nullptr;
Daniel Dunbar137d4222010-12-17 05:50:33 +0000531}
532
Daniel Dunbar395a0992010-12-16 18:36:25 +0000533/// \brief Evaluate the result of an add between (conceptually) two MCValues.
534///
535/// This routine conceptually attempts to construct an MCValue:
536/// Result = (Result_A - Result_B + Result_Cst)
537/// from two MCValue's LHS and RHS where
538/// Result = LHS + RHS
539/// and
540/// Result = (LHS_A - LHS_B + LHS_Cst) + (RHS_A - RHS_B + RHS_Cst).
541///
542/// This routine attempts to aggresively fold the operands such that the result
543/// is representable in an MCValue, but may not always succeed.
544///
545/// \returns True on success, false if the result is not representable in an
546/// MCValue.
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000547
548/// NOTE: It is really important to have both the Asm and Layout arguments.
549/// They might look redundant, but this function can be used before layout
550/// is done (see the object streamer for example) and having the Asm argument
Rafael Espindola1ea7f182010-12-18 04:01:45 +0000551/// lets us avoid relaxations early.
Rafael Espindola59f90b22015-03-25 19:24:39 +0000552static bool
553EvaluateSymbolicAdd(const MCAssembler *Asm, const MCAsmLayout *Layout,
554 const SectionAddrMap *Addrs, bool InSet, const MCValue &LHS,
555 const MCSymbolRefExpr *RHS_A, const MCSymbolRefExpr *RHS_B,
556 int64_t RHS_Cst, MCValue &Res) {
Daniel Dunbar76793ba2010-12-17 01:07:20 +0000557 // FIXME: This routine (and other evaluation parts) are *incredibly* sloppy
558 // about dealing with modifiers. This will ultimately bite us, one day.
559 const MCSymbolRefExpr *LHS_A = LHS.getSymA();
560 const MCSymbolRefExpr *LHS_B = LHS.getSymB();
561 int64_t LHS_Cst = LHS.getConstant();
562
563 // Fold the result constant immediately.
564 int64_t Result_Cst = LHS_Cst + RHS_Cst;
565
Rafael Espindolaee546362010-12-19 04:18:56 +0000566 assert((!Layout || Asm) &&
567 "Must have an assembler object if layout is given!");
568
Daniel Dunbar137d4222010-12-17 05:50:33 +0000569 // If we have a layout, we can fold resolved differences.
Rafael Espindolaee546362010-12-19 04:18:56 +0000570 if (Asm) {
Daniel Dunbar137d4222010-12-17 05:50:33 +0000571 // First, fold out any differences which are fully resolved. By
572 // reassociating terms in
573 // Result = (LHS_A - LHS_B + LHS_Cst) + (RHS_A - RHS_B + RHS_Cst).
574 // we have the four possible differences:
575 // (LHS_A - LHS_B),
576 // (LHS_A - RHS_B),
577 // (RHS_A - LHS_B),
578 // (RHS_A - RHS_B).
Chris Lattner0ab5e2c2011-04-15 05:18:47 +0000579 // Since we are attempting to be as aggressive as possible about folding, we
Daniel Dunbar137d4222010-12-17 05:50:33 +0000580 // attempt to evaluate each possible alternative.
Rafael Espindolaee546362010-12-19 04:18:56 +0000581 AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, LHS_A, LHS_B,
582 Result_Cst);
583 AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, LHS_A, RHS_B,
584 Result_Cst);
585 AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, RHS_A, LHS_B,
586 Result_Cst);
587 AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, RHS_A, RHS_B,
588 Result_Cst);
Daniel Dunbar137d4222010-12-17 05:50:33 +0000589 }
590
Daniel Dunbar76793ba2010-12-17 01:07:20 +0000591 // We can't represent the addition or subtraction of two symbols.
592 if ((LHS_A && RHS_A) || (LHS_B && RHS_B))
Daniel Dunbar19f847f2009-06-30 02:08:27 +0000593 return false;
594
Daniel Dunbar137d4222010-12-17 05:50:33 +0000595 // At this point, we have at most one additive symbol and one subtractive
596 // symbol -- find them.
Daniel Dunbar76793ba2010-12-17 01:07:20 +0000597 const MCSymbolRefExpr *A = LHS_A ? LHS_A : RHS_A;
598 const MCSymbolRefExpr *B = LHS_B ? LHS_B : RHS_B;
Daniel Dunbar137d4222010-12-17 05:50:33 +0000599
Daniel Dunbar76793ba2010-12-17 01:07:20 +0000600 Res = MCValue::get(A, B, Result_Cst);
Daniel Dunbar19f847f2009-06-30 02:08:27 +0000601 return true;
602}
603
Jim Grosbach13760bd2015-05-30 01:25:56 +0000604bool MCExpr::evaluateAsRelocatable(MCValue &Res,
Joerg Sonnenberger752b91b2014-08-10 11:35:12 +0000605 const MCAsmLayout *Layout,
Joerg Sonnenbergerb696d462014-08-10 11:37:07 +0000606 const MCFixup *Fixup) const {
Craig Topperbb694de2014-04-13 04:57:38 +0000607 MCAssembler *Assembler = Layout ? &Layout->getAssembler() : nullptr;
Jim Grosbach13760bd2015-05-30 01:25:56 +0000608 return evaluateAsRelocatableImpl(Res, Assembler, Layout, Fixup, nullptr,
Rafael Espindolaf275ad82015-03-25 13:16:53 +0000609 false);
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000610}
611
Rafael Espindolaaeed3cb2015-03-26 21:11:00 +0000612bool MCExpr::evaluateAsValue(MCValue &Res, const MCAsmLayout &Layout) const {
613 MCAssembler *Assembler = &Layout.getAssembler();
Jim Grosbach13760bd2015-05-30 01:25:56 +0000614 return evaluateAsRelocatableImpl(Res, Assembler, &Layout, nullptr, nullptr,
Rafael Espindolaaeed3cb2015-03-26 21:11:00 +0000615 true);
616}
617
Rafael Espindolae3a20f52015-10-05 12:07:05 +0000618static bool canExpand(const MCSymbol &Sym, bool InSet) {
Rafael Espindola212fdde2015-06-03 21:52:06 +0000619 const MCExpr *Expr = Sym.getVariableValue();
620 const auto *Inner = dyn_cast<MCSymbolRefExpr>(Expr);
621 if (Inner) {
622 if (Inner->getKind() == MCSymbolRefExpr::VK_WEAKREF)
623 return false;
624 }
625
Rafael Espindolaaeed3cb2015-03-26 21:11:00 +0000626 if (InSet)
627 return true;
Rafael Espindolae3a20f52015-10-05 12:07:05 +0000628 return !Sym.isInSection();
Rafael Espindolabc91d7e2014-04-28 20:53:11 +0000629}
630
Jim Grosbach13760bd2015-05-30 01:25:56 +0000631bool MCExpr::evaluateAsRelocatableImpl(MCValue &Res, const MCAssembler *Asm,
Rafael Espindola4262a222010-10-16 18:23:53 +0000632 const MCAsmLayout *Layout,
Joerg Sonnenberger752b91b2014-08-10 11:35:12 +0000633 const MCFixup *Fixup,
Rafael Espindolaf275ad82015-03-25 13:16:53 +0000634 const SectionAddrMap *Addrs,
635 bool InSet) const {
Daniel Dunbar5376c2a2010-03-23 23:47:14 +0000636 ++stats::MCExprEvaluate;
637
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000638 switch (getKind()) {
Chris Lattner38d022e2010-02-08 19:41:07 +0000639 case Target:
Jim Grosbach13760bd2015-05-30 01:25:56 +0000640 return cast<MCTargetExpr>(this)->evaluateAsRelocatableImpl(Res, Layout,
Joerg Sonnenberger752b91b2014-08-10 11:35:12 +0000641 Fixup);
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000642
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000643 case Constant:
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000644 Res = MCValue::get(cast<MCConstantExpr>(this)->getValue());
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000645 return true;
646
647 case SymbolRef: {
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000648 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(this);
649 const MCSymbol &Sym = SRE->getSymbol();
Daniel Dunbar17b90272009-10-16 01:33:57 +0000650
651 // Evaluate recursively if this is a variable.
Rafael Espindolaf275ad82015-03-25 13:16:53 +0000652 if (Sym.isVariable() && SRE->getKind() == MCSymbolRefExpr::VK_None &&
Rafael Espindolae3a20f52015-10-05 12:07:05 +0000653 canExpand(Sym, InSet)) {
Rafael Espindolaaeed3cb2015-03-26 21:11:00 +0000654 bool IsMachO = SRE->hasSubsectionsViaSymbols();
Jim Grosbach13760bd2015-05-30 01:25:56 +0000655 if (Sym.getVariableValue()->evaluateAsRelocatableImpl(
Rafael Espindolaaeed3cb2015-03-26 21:11:00 +0000656 Res, Asm, Layout, Fixup, Addrs, InSet || IsMachO)) {
657 if (!IsMachO)
Rafael Espindolaf275ad82015-03-25 13:16:53 +0000658 return true;
659
Rafael Espindola7fadc0e2014-03-20 02:12:01 +0000660 const MCSymbolRefExpr *A = Res.getSymA();
661 const MCSymbolRefExpr *B = Res.getSymB();
Rafael Espindolaf275ad82015-03-25 13:16:53 +0000662 // FIXME: This is small hack. Given
663 // a = b + 4
664 // .long a
665 // the OS X assembler will completely drop the 4. We should probably
666 // include it in the relocation or produce an error if that is not
667 // possible.
Evgeniy Stepanov60d411b2017-06-08 20:49:03 +0000668 // Allow constant expressions.
Rafael Espindolaf275ad82015-03-25 13:16:53 +0000669 if (!A && !B)
670 return true;
Evgeniy Stepanov60d411b2017-06-08 20:49:03 +0000671 // Allows aliases with zero offset.
672 if (Res.getConstant() == 0 && (!A || !B))
673 return true;
Rafael Espindola7fadc0e2014-03-20 02:12:01 +0000674 }
Rafael Espindola8c3039b2010-11-15 16:33:49 +0000675 }
Daniel Dunbar17b90272009-10-16 01:33:57 +0000676
Craig Topperbb694de2014-04-13 04:57:38 +0000677 Res = MCValue::get(SRE, nullptr, 0);
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000678 return true;
679 }
680
681 case Unary: {
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000682 const MCUnaryExpr *AUE = cast<MCUnaryExpr>(this);
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000683 MCValue Value;
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000684
Jim Grosbach13760bd2015-05-30 01:25:56 +0000685 if (!AUE->getSubExpr()->evaluateAsRelocatableImpl(Value, Asm, Layout, Fixup,
Rafael Espindolaf275ad82015-03-25 13:16:53 +0000686 Addrs, InSet))
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000687 return false;
688
689 switch (AUE->getOpcode()) {
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000690 case MCUnaryExpr::LNot:
Daniel Dunbar0d5fc9a2009-07-01 06:48:00 +0000691 if (!Value.isAbsolute())
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000692 return false;
693 Res = MCValue::get(!Value.getConstant());
694 break;
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000695 case MCUnaryExpr::Minus:
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000696 /// -(a - b + const) ==> (b - a - const)
Daniel Dunbar7f8a9eb2009-08-11 17:47:52 +0000697 if (Value.getSymA() && !Value.getSymB())
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000698 return false;
Sanjay Patel42bbe772016-05-20 14:09:41 +0000699
700 // The cast avoids undefined behavior if the constant is INT64_MIN.
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000701 Res = MCValue::get(Value.getSymB(), Value.getSymA(),
Sanjay Patel42bbe772016-05-20 14:09:41 +0000702 -(uint64_t)Value.getConstant());
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000703 break;
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000704 case MCUnaryExpr::Not:
Daniel Dunbar0d5fc9a2009-07-01 06:48:00 +0000705 if (!Value.isAbsolute())
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000706 return false;
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000707 Res = MCValue::get(~Value.getConstant());
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000708 break;
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000709 case MCUnaryExpr::Plus:
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000710 Res = Value;
711 break;
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000712 }
713
714 return true;
715 }
716
717 case Binary: {
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000718 const MCBinaryExpr *ABE = cast<MCBinaryExpr>(this);
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000719 MCValue LHSValue, RHSValue;
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000720
Jim Grosbach13760bd2015-05-30 01:25:56 +0000721 if (!ABE->getLHS()->evaluateAsRelocatableImpl(LHSValue, Asm, Layout, Fixup,
Rafael Espindolaf275ad82015-03-25 13:16:53 +0000722 Addrs, InSet) ||
Jim Grosbach13760bd2015-05-30 01:25:56 +0000723 !ABE->getRHS()->evaluateAsRelocatableImpl(RHSValue, Asm, Layout, Fixup,
Rafael Espindolaf275ad82015-03-25 13:16:53 +0000724 Addrs, InSet))
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000725 return false;
726
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000727 // We only support a few operations on non-constant expressions, handle
728 // those first.
Daniel Dunbar0d5fc9a2009-07-01 06:48:00 +0000729 if (!LHSValue.isAbsolute() || !RHSValue.isAbsolute()) {
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000730 switch (ABE->getOpcode()) {
731 default:
732 return false;
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000733 case MCBinaryExpr::Sub:
Daniel Dunbar19f847f2009-06-30 02:08:27 +0000734 // Negate RHS and add.
Sanjay Patel42bbe772016-05-20 14:09:41 +0000735 // The cast avoids undefined behavior if the constant is INT64_MIN.
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000736 return EvaluateSymbolicAdd(Asm, Layout, Addrs, InSet, LHSValue,
Daniel Dunbar19f847f2009-06-30 02:08:27 +0000737 RHSValue.getSymB(), RHSValue.getSymA(),
Sanjay Patel42bbe772016-05-20 14:09:41 +0000738 -(uint64_t)RHSValue.getConstant(), Res);
Daniel Dunbar19f847f2009-06-30 02:08:27 +0000739
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000740 case MCBinaryExpr::Add:
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000741 return EvaluateSymbolicAdd(Asm, Layout, Addrs, InSet, LHSValue,
Daniel Dunbar19f847f2009-06-30 02:08:27 +0000742 RHSValue.getSymA(), RHSValue.getSymB(),
Rafael Espindola59f90b22015-03-25 19:24:39 +0000743 RHSValue.getConstant(), Res);
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000744 }
745 }
746
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000747 // FIXME: We need target hooks for the evaluation. It may be limited in
Ahmed Bougacha177c1482015-04-28 00:21:32 +0000748 // width, and gas defines the result of comparisons differently from
749 // Apple as.
Daniel Dunbar39712732009-06-30 16:02:47 +0000750 int64_t LHS = LHSValue.getConstant(), RHS = RHSValue.getConstant();
751 int64_t Result = 0;
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000752 switch (ABE->getOpcode()) {
Ahmed Bougacha177c1482015-04-28 00:21:32 +0000753 case MCBinaryExpr::AShr: Result = LHS >> RHS; break;
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000754 case MCBinaryExpr::Add: Result = LHS + RHS; break;
755 case MCBinaryExpr::And: Result = LHS & RHS; break;
Davide Italiano983366a2015-09-11 22:04:21 +0000756 case MCBinaryExpr::Div:
Simon Pilgrim8831f6e2018-02-22 18:06:48 +0000757 case MCBinaryExpr::Mod:
Davide Italiano63cee812015-09-11 20:47:35 +0000758 // Handle division by zero. gas just emits a warning and keeps going,
759 // we try to be stricter.
760 // FIXME: Currently the caller of this function has no way to understand
761 // we're bailing out because of 'division by zero'. Therefore, it will
762 // emit a 'expected relocatable expression' error. It would be nice to
763 // change this code to emit a better diagnostic.
764 if (RHS == 0)
765 return false;
Simon Pilgrim8831f6e2018-02-22 18:06:48 +0000766 if (ABE->getOpcode() == MCBinaryExpr::Div)
767 Result = LHS / RHS;
768 else
769 Result = LHS % RHS;
Davide Italiano983366a2015-09-11 22:04:21 +0000770 break;
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000771 case MCBinaryExpr::EQ: Result = LHS == RHS; break;
772 case MCBinaryExpr::GT: Result = LHS > RHS; break;
773 case MCBinaryExpr::GTE: Result = LHS >= RHS; break;
774 case MCBinaryExpr::LAnd: Result = LHS && RHS; break;
775 case MCBinaryExpr::LOr: Result = LHS || RHS; break;
Ahmed Bougacha177c1482015-04-28 00:21:32 +0000776 case MCBinaryExpr::LShr: Result = uint64_t(LHS) >> uint64_t(RHS); break;
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000777 case MCBinaryExpr::LT: Result = LHS < RHS; break;
778 case MCBinaryExpr::LTE: Result = LHS <= RHS; break;
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000779 case MCBinaryExpr::Mul: Result = LHS * RHS; break;
780 case MCBinaryExpr::NE: Result = LHS != RHS; break;
781 case MCBinaryExpr::Or: Result = LHS | RHS; break;
Justin Bognerc1602152015-06-23 07:32:55 +0000782 case MCBinaryExpr::Shl: Result = uint64_t(LHS) << uint64_t(RHS); break;
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000783 case MCBinaryExpr::Sub: Result = LHS - RHS; break;
784 case MCBinaryExpr::Xor: Result = LHS ^ RHS; break;
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000785 }
786
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000787 Res = MCValue::get(Result);
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000788 return true;
789 }
790 }
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000791
Craig Toppera2886c22012-02-07 05:05:23 +0000792 llvm_unreachable("Invalid assembly expression kind!");
Daniel Dunbarf3636452009-08-31 08:07:22 +0000793}
Daniel Dunbardc3e4cc2011-04-29 18:00:03 +0000794
Rafael Espindolae3a20f52015-10-05 12:07:05 +0000795MCFragment *MCExpr::findAssociatedFragment() const {
Daniel Dunbardc3e4cc2011-04-29 18:00:03 +0000796 switch (getKind()) {
797 case Target:
798 // We never look through target specific expressions.
Rafael Espindolae3a20f52015-10-05 12:07:05 +0000799 return cast<MCTargetExpr>(this)->findAssociatedFragment();
Daniel Dunbardc3e4cc2011-04-29 18:00:03 +0000800
801 case Constant:
Rafael Espindolae3a20f52015-10-05 12:07:05 +0000802 return MCSymbol::AbsolutePseudoFragment;
Daniel Dunbardc3e4cc2011-04-29 18:00:03 +0000803
804 case SymbolRef: {
805 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(this);
806 const MCSymbol &Sym = SRE->getSymbol();
Rafael Espindolae3a20f52015-10-05 12:07:05 +0000807 return Sym.getFragment();
Daniel Dunbardc3e4cc2011-04-29 18:00:03 +0000808 }
809
810 case Unary:
Rafael Espindolae3a20f52015-10-05 12:07:05 +0000811 return cast<MCUnaryExpr>(this)->getSubExpr()->findAssociatedFragment();
Daniel Dunbardc3e4cc2011-04-29 18:00:03 +0000812
813 case Binary: {
814 const MCBinaryExpr *BE = cast<MCBinaryExpr>(this);
Rafael Espindolae3a20f52015-10-05 12:07:05 +0000815 MCFragment *LHS_F = BE->getLHS()->findAssociatedFragment();
816 MCFragment *RHS_F = BE->getRHS()->findAssociatedFragment();
Daniel Dunbardc3e4cc2011-04-29 18:00:03 +0000817
Rafael Espindolae3a20f52015-10-05 12:07:05 +0000818 // If either is absolute, return the other.
819 if (LHS_F == MCSymbol::AbsolutePseudoFragment)
820 return RHS_F;
821 if (RHS_F == MCSymbol::AbsolutePseudoFragment)
822 return LHS_F;
Daniel Dunbardc3e4cc2011-04-29 18:00:03 +0000823
Peter Collingbourne10d362c2015-04-03 01:46:11 +0000824 // Not always correct, but probably the best we can do without more context.
825 if (BE->getOpcode() == MCBinaryExpr::Sub)
Rafael Espindolae3a20f52015-10-05 12:07:05 +0000826 return MCSymbol::AbsolutePseudoFragment;
Peter Collingbourne10d362c2015-04-03 01:46:11 +0000827
Rafael Espindolae3a20f52015-10-05 12:07:05 +0000828 // Otherwise, return the first non-null fragment.
829 return LHS_F ? LHS_F : RHS_F;
Daniel Dunbardc3e4cc2011-04-29 18:00:03 +0000830 }
831 }
832
Craig Toppera2886c22012-02-07 05:05:23 +0000833 llvm_unreachable("Invalid assembly expression kind!");
Daniel Dunbardc3e4cc2011-04-29 18:00:03 +0000834}