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gerrit-public.fairphone.software / toolchain / llvm-project / 6e00ca887ebbeef8018cd058e68be82697f8b989 / . / llvm / lib / MC / MCExpr.cpp
blob: 3772bceea57d424772585d56ce655ad67b3b5538 [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 Dunbar5376c2a2010-03-23 23:47:14 +0000[diff] [blame]10#define DEBUG_TYPE "mcexpr"
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]11#include "llvm/MC/MCExpr.h"
Daniel Dunbar5376c2a2010-03-23 23:47:14 +0000[diff] [blame]12#include "llvm/ADT/Statistic.h"
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]13#include "llvm/ADT/StringSwitch.h"
David Peixotto8ad70b32013-12-04 22:43:20 +0000[diff] [blame]14#include "llvm/MC/MCAsmInfo.h"
Daniel Dunbar5c5228a2010-03-11 05:53:37 +0000[diff] [blame]15#include "llvm/MC/MCAsmLayout.h"
16#include "llvm/MC/MCAssembler.h"
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]17#include "llvm/MC/MCContext.h"
Craig Topper6e80c282012-03-26 06:58:25 +0000[diff] [blame]18#include "llvm/MC/MCObjectWriter.h"
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]19#include "llvm/MC/MCSymbol.h"
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]20#include "llvm/MC/MCValue.h"
David Greenea8cbfb82010-01-05 01:28:07 +0000[diff] [blame]21#include "llvm/Support/Debug.h"
Chandler Carruthf3e85022012-01-10 18:08:01 +0000[diff] [blame]22#include "llvm/Support/ErrorHandling.h"
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]23#include "llvm/Support/raw_ostream.h"
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]24using namespace llvm;
25
Daniel Dunbar5376c2a2010-03-23 23:47:14 +0000[diff] [blame]26namespace {
27namespace stats {
28STATISTIC(MCExprEvaluate, "Number of MCExpr evaluations");
29}
30}
31
Chris Lattnerc8f77172010-01-18 00:37:40 +0000[diff] [blame]32void MCExpr::print(raw_ostream &OS) const {
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]33 switch (getKind()) {
Chris Lattner38d022e2010-02-08 19:41:07 +0000[diff] [blame]34 case MCExpr::Target:
35 return cast<MCTargetExpr>(this)->PrintImpl(OS);
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]36 case MCExpr::Constant:
37 OS << cast<MCConstantExpr>(*this).getValue();
38 return;
39
Chris Lattner22833a32009-09-08 23:20:50 +0000[diff] [blame]40 case MCExpr::SymbolRef: {
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]41 const MCSymbolRefExpr &SRE = cast<MCSymbolRefExpr>(*this);
42 const MCSymbol &Sym = SRE.getSymbol();
Chris Lattneredb9d842010-11-15 02:46:57 +0000[diff] [blame]43 // Parenthesize names that start with $ so that they don't look like
44 // absolute names.
45 bool UseParens = Sym.getName()[0] == '$';
Chris Lattneredb9d842010-11-15 02:46:57 +0000[diff] [blame]46 if (UseParens)
Chris Lattner8b5d55e2010-01-17 21:43:43 +0000[diff] [blame]47 OS << '(' << Sym << ')';
48 else
49 OS << Sym;
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]50
David Peixotto8ad70b32013-12-04 22:43:20 +0000[diff] [blame]51 if (SRE.getKind() != MCSymbolRefExpr::VK_None) {
52 if (SRE.getMCAsmInfo().useParensForSymbolVariant())
53 OS << '(' << MCSymbolRefExpr::getVariantKindName(SRE.getKind()) << ')';
54 else
55 OS << '@' << MCSymbolRefExpr::getVariantKindName(SRE.getKind());
56 }
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]57
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]58 return;
Chris Lattner22833a32009-09-08 23:20:50 +0000[diff] [blame]59 }
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]60
61 case MCExpr::Unary: {
62 const MCUnaryExpr &UE = cast<MCUnaryExpr>(*this);
63 switch (UE.getOpcode()) {
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]64 case MCUnaryExpr::LNot: OS << '!'; break;
65 case MCUnaryExpr::Minus: OS << '-'; break;
66 case MCUnaryExpr::Not: OS << '~'; break;
67 case MCUnaryExpr::Plus: OS << '+'; break;
68 }
Chris Lattnerc8f77172010-01-18 00:37:40 +0000[diff] [blame]69 OS << *UE.getSubExpr();
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]70 return;
71 }
72
73 case MCExpr::Binary: {
74 const MCBinaryExpr &BE = cast<MCBinaryExpr>(*this);
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]75
Chris Lattner3cfc5512009-09-08 06:34:07 +0000[diff] [blame]76 // Only print parens around the LHS if it is non-trivial.
77 if (isa<MCConstantExpr>(BE.getLHS()) || isa<MCSymbolRefExpr>(BE.getLHS())) {
Chris Lattnerc8f77172010-01-18 00:37:40 +0000[diff] [blame]78 OS << *BE.getLHS();
Chris Lattner3cfc5512009-09-08 06:34:07 +0000[diff] [blame]79 } else {
Chris Lattnerc8f77172010-01-18 00:37:40 +0000[diff] [blame]80 OS << '(' << *BE.getLHS() << ')';
Chris Lattner3cfc5512009-09-08 06:34:07 +0000[diff] [blame]81 }
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]82
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]83 switch (BE.getOpcode()) {
Chris Lattner7975b8f2009-09-08 06:37:35 +0000[diff] [blame]84 case MCBinaryExpr::Add:
85 // Print "X-42" instead of "X+-42".
86 if (const MCConstantExpr *RHSC = dyn_cast<MCConstantExpr>(BE.getRHS())) {
87 if (RHSC->getValue() < 0) {
88 OS << RHSC->getValue();
89 return;
90 }
91 }
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]92
Chris Lattner7975b8f2009-09-08 06:37:35 +0000[diff] [blame]93 OS << '+';
94 break;
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]95 case MCBinaryExpr::And: OS << '&'; break;
96 case MCBinaryExpr::Div: OS << '/'; break;
97 case MCBinaryExpr::EQ: OS << "=="; break;
98 case MCBinaryExpr::GT: OS << '>'; break;
99 case MCBinaryExpr::GTE: OS << ">="; break;
100 case MCBinaryExpr::LAnd: OS << "&&"; break;
101 case MCBinaryExpr::LOr: OS << "||"; break;
102 case MCBinaryExpr::LT: OS << '<'; break;
103 case MCBinaryExpr::LTE: OS << "<="; break;
104 case MCBinaryExpr::Mod: OS << '%'; break;
105 case MCBinaryExpr::Mul: OS << '*'; break;
106 case MCBinaryExpr::NE: OS << "!="; break;
107 case MCBinaryExpr::Or: OS << '|'; break;
108 case MCBinaryExpr::Shl: OS << "<<"; break;
109 case MCBinaryExpr::Shr: OS << ">>"; break;
110 case MCBinaryExpr::Sub: OS << '-'; break;
111 case MCBinaryExpr::Xor: OS << '^'; break;
112 }
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]113
Chris Lattner3cfc5512009-09-08 06:34:07 +0000[diff] [blame]114 // Only print parens around the LHS if it is non-trivial.
115 if (isa<MCConstantExpr>(BE.getRHS()) || isa<MCSymbolRefExpr>(BE.getRHS())) {
Chris Lattnerc8f77172010-01-18 00:37:40 +0000[diff] [blame]116 OS << *BE.getRHS();
Chris Lattner3cfc5512009-09-08 06:34:07 +0000[diff] [blame]117 } else {
Chris Lattnerc8f77172010-01-18 00:37:40 +0000[diff] [blame]118 OS << '(' << *BE.getRHS() << ')';
Chris Lattner3cfc5512009-09-08 06:34:07 +0000[diff] [blame]119 }
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]120 return;
121 }
122 }
123
Craig Toppera2886c22012-02-07 05:05:23 +0000[diff] [blame]124 llvm_unreachable("Invalid expression kind!");
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]125}
126
Manman Ren49d684e2012-09-12 05:06:18 +0000[diff] [blame]127#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]128void MCExpr::dump() const {
Chris Lattnerc8f77172010-01-18 00:37:40 +0000[diff] [blame]129 print(dbgs());
David Greenea8cbfb82010-01-05 01:28:07 +0000[diff] [blame]130 dbgs() << '\n';
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]131}
Manman Renc3366cc2012-09-06 19:55:56 +0000[diff] [blame]132#endif
Daniel Dunbarb34a2b92009-08-31 08:07:33 +0000[diff] [blame]133
134/* *** */
135
Chris Lattnera0020be2009-09-08 06:27:48 +0000[diff] [blame]136const MCBinaryExpr *MCBinaryExpr::Create(Opcode Opc, const MCExpr *LHS,
137 const MCExpr *RHS, MCContext &Ctx) {
Daniel Dunbarf3636452009-08-31 08:07:22 +0000[diff] [blame]138 return new (Ctx) MCBinaryExpr(Opc, LHS, RHS);
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]139}
140
Chris Lattnera0020be2009-09-08 06:27:48 +0000[diff] [blame]141const MCUnaryExpr *MCUnaryExpr::Create(Opcode Opc, const MCExpr *Expr,
142 MCContext &Ctx) {
Daniel Dunbarf3636452009-08-31 08:07:22 +0000[diff] [blame]143 return new (Ctx) MCUnaryExpr(Opc, Expr);
144}
145
146const MCConstantExpr *MCConstantExpr::Create(int64_t Value, MCContext &Ctx) {
147 return new (Ctx) MCConstantExpr(Value);
148}
149
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]150/* *** */
151
Daniel Dunbarf3636452009-08-31 08:07:22 +0000[diff] [blame]152const MCSymbolRefExpr *MCSymbolRefExpr::Create(const MCSymbol *Sym,
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]153 VariantKind Kind,
Daniel Dunbarf3636452009-08-31 08:07:22 +0000[diff] [blame]154 MCContext &Ctx) {
David Peixotto8ad70b32013-12-04 22:43:20 +0000[diff] [blame]155 return new (Ctx) MCSymbolRefExpr(Sym, Kind, Ctx.getAsmInfo());
Daniel Dunbarf3636452009-08-31 08:07:22 +0000[diff] [blame]156}
157
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]158const MCSymbolRefExpr *MCSymbolRefExpr::Create(StringRef Name, VariantKind Kind,
159 MCContext &Ctx) {
160 return Create(Ctx.GetOrCreateSymbol(Name), Kind, Ctx);
Chris Lattner6a833f62009-09-16 01:26:31 +0000[diff] [blame]161}
162
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]163StringRef MCSymbolRefExpr::getVariantKindName(VariantKind Kind) {
164 switch (Kind) {
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]165 case VK_Invalid: return "<<invalid>>";
166 case VK_None: return "<<none>>";
167
168 case VK_GOT: return "GOT";
169 case VK_GOTOFF: return "GOTOFF";
170 case VK_GOTPCREL: return "GOTPCREL";
171 case VK_GOTTPOFF: return "GOTTPOFF";
172 case VK_INDNTPOFF: return "INDNTPOFF";
173 case VK_NTPOFF: return "NTPOFF";
Rafael Espindolab3b49bb2010-10-28 14:22:44 +0000[diff] [blame]174 case VK_GOTNTPOFF: return "GOTNTPOFF";
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]175 case VK_PLT: return "PLT";
176 case VK_TLSGD: return "TLSGD";
Rafael Espindola2dbec3f2010-10-28 15:02:40 +0000[diff] [blame]177 case VK_TLSLD: return "TLSLD";
Rafael Espindola6f23eb32010-10-28 14:37:09 +0000[diff] [blame]178 case VK_TLSLDM: return "TLSLDM";
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]179 case VK_TPOFF: return "TPOFF";
Rafael Espindolae8f08be2010-10-28 14:48:59 +0000[diff] [blame]180 case VK_DTPOFF: return "DTPOFF";
Chris Lattner94f0c142010-11-14 22:22:59 +0000[diff] [blame]181 case VK_TLVP: return "TLVP";
Benjamin Kramer9c9e0a22013-03-30 16:21:50 +0000[diff] [blame]182 case VK_SECREL: return "SECREL32";
David Peixotto8ad70b32013-12-04 22:43:20 +0000[diff] [blame]183 case VK_ARM_NONE: return "none";
184 case VK_ARM_TARGET1: return "target1";
185 case VK_ARM_TARGET2: return "target2";
186 case VK_ARM_PREL31: return "prel31";
Kai Nackee51c8132014-01-20 11:00:40 +0000[diff] [blame]187 case VK_ARM_TLSLDO: return "tlsldo";
Saleem Abdulrasool6e00ca82014-01-30 04:02:31 +0000[diff] [blame^]188 case VK_ARM_TLSCALL: return "tlscall";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]189 case VK_PPC_LO: return "l";
Ulrich Weigande67c5652013-06-21 14:42:49 +0000[diff] [blame]190 case VK_PPC_HI: return "h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]191 case VK_PPC_HA: return "ha";
Ulrich Weigande9126f52013-06-21 14:43:42 +0000[diff] [blame]192 case VK_PPC_HIGHER: return "higher";
193 case VK_PPC_HIGHERA: return "highera";
194 case VK_PPC_HIGHEST: return "highest";
195 case VK_PPC_HIGHESTA: return "highesta";
Ulrich Weigand93372b42013-06-25 16:49:50 +0000[diff] [blame]196 case VK_PPC_GOT_LO: return "got@l";
197 case VK_PPC_GOT_HI: return "got@h";
198 case VK_PPC_GOT_HA: return "got@ha";
Ulrich Weigand68e2e1b2013-06-20 22:39:42 +0000[diff] [blame]199 case VK_PPC_TOCBASE: return "tocbase";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]200 case VK_PPC_TOC: return "toc";
201 case VK_PPC_TOC_LO: return "toc@l";
Ulrich Weigand72ddbd62013-06-21 14:43:10 +0000[diff] [blame]202 case VK_PPC_TOC_HI: return "toc@h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]203 case VK_PPC_TOC_HA: return "toc@ha";
Ulrich Weigandf11efe72013-07-01 23:33:29 +0000[diff] [blame]204 case VK_PPC_DTPMOD: return "dtpmod";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]205 case VK_PPC_TPREL: return "tprel";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]206 case VK_PPC_TPREL_LO: return "tprel@l";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]207 case VK_PPC_TPREL_HI: return "tprel@h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]208 case VK_PPC_TPREL_HA: return "tprel@ha";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]209 case VK_PPC_TPREL_HIGHER: return "tprel@higher";
210 case VK_PPC_TPREL_HIGHERA: return "tprel@highera";
211 case VK_PPC_TPREL_HIGHEST: return "tprel@highest";
212 case VK_PPC_TPREL_HIGHESTA: return "tprel@highesta";
213 case VK_PPC_DTPREL: return "dtprel";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]214 case VK_PPC_DTPREL_LO: return "dtprel@l";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]215 case VK_PPC_DTPREL_HI: return "dtprel@h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]216 case VK_PPC_DTPREL_HA: return "dtprel@ha";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]217 case VK_PPC_DTPREL_HIGHER: return "dtprel@higher";
218 case VK_PPC_DTPREL_HIGHERA: return "dtprel@highera";
219 case VK_PPC_DTPREL_HIGHEST: return "dtprel@highest";
220 case VK_PPC_DTPREL_HIGHESTA: return "dtprel@highesta";
221 case VK_PPC_GOT_TPREL: return "got@tprel";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]222 case VK_PPC_GOT_TPREL_LO: return "got@tprel@l";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]223 case VK_PPC_GOT_TPREL_HI: return "got@tprel@h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]224 case VK_PPC_GOT_TPREL_HA: return "got@tprel@ha";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]225 case VK_PPC_GOT_DTPREL: return "got@dtprel";
226 case VK_PPC_GOT_DTPREL_LO: return "got@dtprel@l";
227 case VK_PPC_GOT_DTPREL_HI: return "got@dtprel@h";
228 case VK_PPC_GOT_DTPREL_HA: return "got@dtprel@ha";
Bill Schmidtca4a0c92012-12-04 16:18:08 +0000[diff] [blame]229 case VK_PPC_TLS: return "tls";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]230 case VK_PPC_GOT_TLSGD: return "got@tlsgd";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]231 case VK_PPC_GOT_TLSGD_LO: return "got@tlsgd@l";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]232 case VK_PPC_GOT_TLSGD_HI: return "got@tlsgd@h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]233 case VK_PPC_GOT_TLSGD_HA: return "got@tlsgd@ha";
Ulrich Weigand52cf8e42013-07-09 16:41:09 +0000[diff] [blame]234 case VK_PPC_TLSGD: return "tlsgd";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]235 case VK_PPC_GOT_TLSLD: return "got@tlsld";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]236 case VK_PPC_GOT_TLSLD_LO: return "got@tlsld@l";
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]237 case VK_PPC_GOT_TLSLD_HI: return "got@tlsld@h";
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]238 case VK_PPC_GOT_TLSLD_HA: return "got@tlsld@ha";
Ulrich Weigand52cf8e42013-07-09 16:41:09 +0000[diff] [blame]239 case VK_PPC_TLSLD: return "tlsld";
Akira Hatanakae2eed962011-12-22 01:05:17 +0000[diff] [blame]240 case VK_Mips_GPREL: return "GPREL";
241 case VK_Mips_GOT_CALL: return "GOT_CALL";
242 case VK_Mips_GOT16: return "GOT16";
243 case VK_Mips_GOT: return "GOT";
244 case VK_Mips_ABS_HI: return "ABS_HI";
245 case VK_Mips_ABS_LO: return "ABS_LO";
246 case VK_Mips_TLSGD: return "TLSGD";
247 case VK_Mips_TLSLDM: return "TLSLDM";
248 case VK_Mips_DTPREL_HI: return "DTPREL_HI";
249 case VK_Mips_DTPREL_LO: return "DTPREL_LO";
250 case VK_Mips_GOTTPREL: return "GOTTPREL";
251 case VK_Mips_TPREL_HI: return "TPREL_HI";
252 case VK_Mips_TPREL_LO: return "TPREL_LO";
253 case VK_Mips_GPOFF_HI: return "GPOFF_HI";
254 case VK_Mips_GPOFF_LO: return "GPOFF_LO";
255 case VK_Mips_GOT_DISP: return "GOT_DISP";
256 case VK_Mips_GOT_PAGE: return "GOT_PAGE";
257 case VK_Mips_GOT_OFST: return "GOT_OFST";
Akira Hatanakaf73e3622012-07-21 02:15:19 +0000[diff] [blame]258 case VK_Mips_HIGHER: return "HIGHER";
259 case VK_Mips_HIGHEST: return "HIGHEST";
Akira Hatanaka64b52d82012-11-21 19:50:22 +0000[diff] [blame]260 case VK_Mips_GOT_HI16: return "GOT_HI16";
261 case VK_Mips_GOT_LO16: return "GOT_LO16";
262 case VK_Mips_CALL_HI16: return "CALL_HI16";
263 case VK_Mips_CALL_LO16: return "CALL_LO16";
Nico Rieck1da45292013-04-10 23:28:17 +0000[diff] [blame]264 case VK_COFF_IMGREL32: return "IMGREL32";
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]265 }
Chandler Carruthf3e85022012-01-10 18:08:01 +0000[diff] [blame]266 llvm_unreachable("Invalid variant kind");
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]267}
268
269MCSymbolRefExpr::VariantKind
270MCSymbolRefExpr::getVariantKindForName(StringRef Name) {
271 return StringSwitch<VariantKind>(Name)
272 .Case("GOT", VK_GOT)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]273 .Case("got", VK_GOT)
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]274 .Case("GOTOFF", VK_GOTOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]275 .Case("gotoff", VK_GOTOFF)
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]276 .Case("GOTPCREL", VK_GOTPCREL)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]277 .Case("gotpcrel", VK_GOTPCREL)
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]278 .Case("GOTTPOFF", VK_GOTTPOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]279 .Case("gottpoff", VK_GOTTPOFF)
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]280 .Case("INDNTPOFF", VK_INDNTPOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]281 .Case("indntpoff", VK_INDNTPOFF)
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]282 .Case("NTPOFF", VK_NTPOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]283 .Case("ntpoff", VK_NTPOFF)
Rafael Espindolab3b49bb2010-10-28 14:22:44 +0000[diff] [blame]284 .Case("GOTNTPOFF", VK_GOTNTPOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]285 .Case("gotntpoff", VK_GOTNTPOFF)
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]286 .Case("PLT", VK_PLT)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]287 .Case("plt", VK_PLT)
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]288 .Case("TLSGD", VK_TLSGD)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]289 .Case("tlsgd", VK_TLSGD)
Rafael Espindola2dbec3f2010-10-28 15:02:40 +0000[diff] [blame]290 .Case("TLSLD", VK_TLSLD)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]291 .Case("tlsld", VK_TLSLD)
Rafael Espindola6f23eb32010-10-28 14:37:09 +0000[diff] [blame]292 .Case("TLSLDM", VK_TLSLDM)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]293 .Case("tlsldm", VK_TLSLDM)
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]294 .Case("TPOFF", VK_TPOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]295 .Case("tpoff", VK_TPOFF)
Rafael Espindolae8f08be2010-10-28 14:48:59 +0000[diff] [blame]296 .Case("DTPOFF", VK_DTPOFF)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]297 .Case("dtpoff", VK_DTPOFF)
Eric Christophere7b64dc2010-05-26 00:02:12 +0000[diff] [blame]298 .Case("TLVP", VK_TLVP)
Rafael Espindola8bac4232011-01-23 16:11:25 +0000[diff] [blame]299 .Case("tlvp", VK_TLVP)
Nico Rieck1da45292013-04-10 23:28:17 +0000[diff] [blame]300 .Case("IMGREL", VK_COFF_IMGREL32)
301 .Case("imgrel", VK_COFF_IMGREL32)
Rafael Espindolab770f892013-04-25 19:27:05 +0000[diff] [blame]302 .Case("SECREL32", VK_SECREL)
303 .Case("secrel32", VK_SECREL)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]304 .Case("L", VK_PPC_LO)
305 .Case("l", VK_PPC_LO)
Ulrich Weigande67c5652013-06-21 14:42:49 +0000[diff] [blame]306 .Case("H", VK_PPC_HI)
307 .Case("h", VK_PPC_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]308 .Case("HA", VK_PPC_HA)
309 .Case("ha", VK_PPC_HA)
Ulrich Weigande9126f52013-06-21 14:43:42 +0000[diff] [blame]310 .Case("HIGHER", VK_PPC_HIGHER)
311 .Case("higher", VK_PPC_HIGHER)
312 .Case("HIGHERA", VK_PPC_HIGHERA)
313 .Case("highera", VK_PPC_HIGHERA)
314 .Case("HIGHEST", VK_PPC_HIGHEST)
315 .Case("highest", VK_PPC_HIGHEST)
316 .Case("HIGHESTA", VK_PPC_HIGHESTA)
317 .Case("highesta", VK_PPC_HIGHESTA)
Ulrich Weigand93372b42013-06-25 16:49:50 +0000[diff] [blame]318 .Case("GOT@L", VK_PPC_GOT_LO)
319 .Case("got@l", VK_PPC_GOT_LO)
320 .Case("GOT@H", VK_PPC_GOT_HI)
321 .Case("got@h", VK_PPC_GOT_HI)
322 .Case("GOT@HA", VK_PPC_GOT_HA)
323 .Case("got@ha", VK_PPC_GOT_HA)
Ulrich Weigand68e2e1b2013-06-20 22:39:42 +0000[diff] [blame]324 .Case("TOCBASE", VK_PPC_TOCBASE)
325 .Case("tocbase", VK_PPC_TOCBASE)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]326 .Case("TOC", VK_PPC_TOC)
327 .Case("toc", VK_PPC_TOC)
328 .Case("TOC@L", VK_PPC_TOC_LO)
329 .Case("toc@l", VK_PPC_TOC_LO)
Ulrich Weigand72ddbd62013-06-21 14:43:10 +0000[diff] [blame]330 .Case("TOC@H", VK_PPC_TOC_HI)
331 .Case("toc@h", VK_PPC_TOC_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]332 .Case("TOC@HA", VK_PPC_TOC_HA)
333 .Case("toc@ha", VK_PPC_TOC_HA)
Ulrich Weigand2c3a2192013-05-03 19:52:35 +0000[diff] [blame]334 .Case("TLS", VK_PPC_TLS)
335 .Case("tls", VK_PPC_TLS)
Ulrich Weigandf11efe72013-07-01 23:33:29 +0000[diff] [blame]336 .Case("DTPMOD", VK_PPC_DTPMOD)
337 .Case("dtpmod", VK_PPC_DTPMOD)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]338 .Case("TPREL", VK_PPC_TPREL)
339 .Case("tprel", VK_PPC_TPREL)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]340 .Case("TPREL@L", VK_PPC_TPREL_LO)
341 .Case("tprel@l", VK_PPC_TPREL_LO)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]342 .Case("TPREL@H", VK_PPC_TPREL_HI)
343 .Case("tprel@h", VK_PPC_TPREL_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]344 .Case("TPREL@HA", VK_PPC_TPREL_HA)
345 .Case("tprel@ha", VK_PPC_TPREL_HA)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]346 .Case("TPREL@HIGHER", VK_PPC_TPREL_HIGHER)
347 .Case("tprel@higher", VK_PPC_TPREL_HIGHER)
348 .Case("TPREL@HIGHERA", VK_PPC_TPREL_HIGHERA)
349 .Case("tprel@highera", VK_PPC_TPREL_HIGHERA)
350 .Case("TPREL@HIGHEST", VK_PPC_TPREL_HIGHEST)
351 .Case("tprel@highest", VK_PPC_TPREL_HIGHEST)
352 .Case("TPREL@HIGHESTA", VK_PPC_TPREL_HIGHESTA)
353 .Case("tprel@highesta", VK_PPC_TPREL_HIGHESTA)
354 .Case("DTPREL", VK_PPC_DTPREL)
355 .Case("dtprel", VK_PPC_DTPREL)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]356 .Case("DTPREL@L", VK_PPC_DTPREL_LO)
357 .Case("dtprel@l", VK_PPC_DTPREL_LO)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]358 .Case("DTPREL@H", VK_PPC_DTPREL_HI)
359 .Case("dtprel@h", VK_PPC_DTPREL_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]360 .Case("DTPREL@HA", VK_PPC_DTPREL_HA)
361 .Case("dtprel@ha", VK_PPC_DTPREL_HA)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]362 .Case("DTPREL@HIGHER", VK_PPC_DTPREL_HIGHER)
363 .Case("dtprel@higher", VK_PPC_DTPREL_HIGHER)
364 .Case("DTPREL@HIGHERA", VK_PPC_DTPREL_HIGHERA)
365 .Case("dtprel@highera", VK_PPC_DTPREL_HIGHERA)
366 .Case("DTPREL@HIGHEST", VK_PPC_DTPREL_HIGHEST)
367 .Case("dtprel@highest", VK_PPC_DTPREL_HIGHEST)
368 .Case("DTPREL@HIGHESTA", VK_PPC_DTPREL_HIGHESTA)
369 .Case("dtprel@highesta", VK_PPC_DTPREL_HIGHESTA)
370 .Case("GOT@TPREL", VK_PPC_GOT_TPREL)
371 .Case("got@tprel", VK_PPC_GOT_TPREL)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]372 .Case("GOT@TPREL@L", VK_PPC_GOT_TPREL_LO)
373 .Case("got@tprel@l", VK_PPC_GOT_TPREL_LO)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]374 .Case("GOT@TPREL@H", VK_PPC_GOT_TPREL_HI)
375 .Case("got@tprel@h", VK_PPC_GOT_TPREL_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]376 .Case("GOT@TPREL@HA", VK_PPC_GOT_TPREL_HA)
377 .Case("got@tprel@ha", VK_PPC_GOT_TPREL_HA)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]378 .Case("GOT@DTPREL", VK_PPC_GOT_DTPREL)
379 .Case("got@dtprel", VK_PPC_GOT_DTPREL)
380 .Case("GOT@DTPREL@L", VK_PPC_GOT_DTPREL_LO)
381 .Case("got@dtprel@l", VK_PPC_GOT_DTPREL_LO)
382 .Case("GOT@DTPREL@H", VK_PPC_GOT_DTPREL_HI)
383 .Case("got@dtprel@h", VK_PPC_GOT_DTPREL_HI)
384 .Case("GOT@DTPREL@HA", VK_PPC_GOT_DTPREL_HA)
385 .Case("got@dtprel@ha", VK_PPC_GOT_DTPREL_HA)
386 .Case("GOT@TLSGD", VK_PPC_GOT_TLSGD)
387 .Case("got@tlsgd", VK_PPC_GOT_TLSGD)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]388 .Case("GOT@TLSGD@L", VK_PPC_GOT_TLSGD_LO)
389 .Case("got@tlsgd@l", VK_PPC_GOT_TLSGD_LO)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]390 .Case("GOT@TLSGD@H", VK_PPC_GOT_TLSGD_HI)
391 .Case("got@tlsgd@h", VK_PPC_GOT_TLSGD_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]392 .Case("GOT@TLSGD@HA", VK_PPC_GOT_TLSGD_HA)
393 .Case("got@tlsgd@ha", VK_PPC_GOT_TLSGD_HA)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]394 .Case("GOT@TLSLD", VK_PPC_GOT_TLSLD)
395 .Case("got@tlsld", VK_PPC_GOT_TLSLD)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]396 .Case("GOT@TLSLD@L", VK_PPC_GOT_TLSLD_LO)
397 .Case("got@tlsld@l", VK_PPC_GOT_TLSLD_LO)
Ulrich Weigand876a0d02013-06-21 14:44:15 +0000[diff] [blame]398 .Case("GOT@TLSLD@H", VK_PPC_GOT_TLSLD_HI)
399 .Case("got@tlsld@h", VK_PPC_GOT_TLSLD_HI)
Ulrich Weigandd51c09f2013-06-21 14:42:20 +0000[diff] [blame]400 .Case("GOT@TLSLD@HA", VK_PPC_GOT_TLSLD_HA)
401 .Case("got@tlsld@ha", VK_PPC_GOT_TLSLD_HA)
David Peixotto8ad70b32013-12-04 22:43:20 +0000[diff] [blame]402 .Case("NONE", VK_ARM_NONE)
403 .Case("none", VK_ARM_NONE)
404 .Case("TARGET1", VK_ARM_TARGET1)
405 .Case("target1", VK_ARM_TARGET1)
406 .Case("TARGET2", VK_ARM_TARGET2)
407 .Case("target2", VK_ARM_TARGET2)
408 .Case("PREL31", VK_ARM_PREL31)
409 .Case("prel31", VK_ARM_PREL31)
Kai Nackee51c8132014-01-20 11:00:40 +0000[diff] [blame]410 .Case("TLSLDO", VK_ARM_TLSLDO)
411 .Case("tlsldo", VK_ARM_TLSLDO)
Saleem Abdulrasool6e00ca82014-01-30 04:02:31 +0000[diff] [blame^]412 .Case("TLSCALL", VK_ARM_TLSCALL)
413 .Case("tlscall", VK_ARM_TLSCALL)
Daniel Dunbar55992562010-03-15 23:51:06 +0000[diff] [blame]414 .Default(VK_Invalid);
415}
416
417/* *** */
418
Craig Topper2a6a08b2012-09-26 06:36:36 +0000[diff] [blame]419void MCTargetExpr::anchor() {}
Chris Lattner6a833f62009-09-16 01:26:31 +0000[diff] [blame]420
Daniel Dunbarf3636452009-08-31 08:07:22 +0000[diff] [blame]421/* *** */
422
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]423bool MCExpr::EvaluateAsAbsolute(int64_t &Res) const {
424 return EvaluateAsAbsolute(Res, 0, 0, 0);
425}
426
427bool MCExpr::EvaluateAsAbsolute(int64_t &Res,
428 const MCAsmLayout &Layout) const {
429 return EvaluateAsAbsolute(Res, &Layout.getAssembler(), &Layout, 0);
430}
431
432bool MCExpr::EvaluateAsAbsolute(int64_t &Res,
433 const MCAsmLayout &Layout,
434 const SectionAddrMap &Addrs) const {
435 return EvaluateAsAbsolute(Res, &Layout.getAssembler(), &Layout, &Addrs);
436}
437
438bool MCExpr::EvaluateAsAbsolute(int64_t &Res, const MCAssembler &Asm) const {
439 return EvaluateAsAbsolute(Res, &Asm, 0, 0);
440}
441
442bool MCExpr::EvaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm,
443 const MCAsmLayout *Layout,
Rafael Espindola93e3cf02010-12-07 00:27:36 +0000[diff] [blame]444 const SectionAddrMap *Addrs) const {
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]445 MCValue Value;
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]446
Daniel Dunbar5cfb5872010-03-23 23:47:07 +0000[diff] [blame]447 // Fast path constants.
448 if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(this)) {
449 Res = CE->getValue();
450 return true;
451 }
452
Rafael Espindola293a7c12010-12-18 04:19:20 +0000[diff] [blame]453 // FIXME: The use if InSet = Addrs is a hack. Setting InSet causes us
454 // absolutize differences across sections and that is what the MachO writer
455 // uses Addrs for.
Rafael Espindola4124ab12010-12-22 22:16:24 +0000[diff] [blame]456 bool IsRelocatable =
457 EvaluateAsRelocatableImpl(Value, Asm, Layout, Addrs, /*InSet*/ Addrs);
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]458
Rafael Espindola4124ab12010-12-22 22:16:24 +0000[diff] [blame]459 // Record the current value.
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]460 Res = Value.getConstant();
Rafael Espindola4124ab12010-12-22 22:16:24 +0000[diff] [blame]461
462 return IsRelocatable && Value.isAbsolute();
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]463}
464
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]465/// \brief Helper method for \see EvaluateSymbolAdd().
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]466static void AttemptToFoldSymbolOffsetDifference(const MCAssembler *Asm,
467 const MCAsmLayout *Layout,
468 const SectionAddrMap *Addrs,
469 bool InSet,
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]470 const MCSymbolRefExpr *&A,
471 const MCSymbolRefExpr *&B,
472 int64_t &Addend) {
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]473 if (!A || !B)
474 return;
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]475
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]476 const MCSymbol &SA = A->getSymbol();
477 const MCSymbol &SB = B->getSymbol();
478
479 if (SA.isUndefined() || SB.isUndefined())
480 return;
481
482 if (!Asm->getWriter().IsSymbolRefDifferenceFullyResolved(*Asm, A, B, InSet))
483 return;
484
485 MCSymbolData &AD = Asm->getSymbolData(SA);
486 MCSymbolData &BD = Asm->getSymbolData(SB);
487
488 if (AD.getFragment() == BD.getFragment()) {
489 Addend += (AD.getOffset() - BD.getOffset());
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]490
Owen Anderson97462862011-03-21 23:13:43 +0000[diff] [blame]491 // Pointers to Thumb symbols need to have their low-bit set to allow
492 // for interworking.
493 if (Asm->isThumbFunc(&SA))
494 Addend |= 1;
495
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]496 // Clear the symbol expr pointers to indicate we have folded these
497 // operands.
498 A = B = 0;
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]499 return;
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]500 }
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]501
502 if (!Layout)
503 return;
504
505 const MCSectionData &SecA = *AD.getFragment()->getParent();
506 const MCSectionData &SecB = *BD.getFragment()->getParent();
507
508 if ((&SecA != &SecB) && !Addrs)
509 return;
510
511 // Eagerly evaluate.
512 Addend += (Layout->getSymbolOffset(&Asm->getSymbolData(A->getSymbol())) -
513 Layout->getSymbolOffset(&Asm->getSymbolData(B->getSymbol())));
514 if (Addrs && (&SecA != &SecB))
515 Addend += (Addrs->lookup(&SecA) - Addrs->lookup(&SecB));
516
Jim Grosbach213039a2012-02-24 05:12:18 +0000[diff] [blame]517 // Pointers to Thumb symbols need to have their low-bit set to allow
518 // for interworking.
519 if (Asm->isThumbFunc(&SA))
520 Addend |= 1;
521
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]522 // Clear the symbol expr pointers to indicate we have folded these
523 // operands.
524 A = B = 0;
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]525}
526
Daniel Dunbar395a0992010-12-16 18:36:25 +0000[diff] [blame]527/// \brief Evaluate the result of an add between (conceptually) two MCValues.
528///
529/// This routine conceptually attempts to construct an MCValue:
530/// Result = (Result_A - Result_B + Result_Cst)
531/// from two MCValue's LHS and RHS where
532/// Result = LHS + RHS
533/// and
534/// Result = (LHS_A - LHS_B + LHS_Cst) + (RHS_A - RHS_B + RHS_Cst).
535///
536/// This routine attempts to aggresively fold the operands such that the result
537/// is representable in an MCValue, but may not always succeed.
538///
539/// \returns True on success, false if the result is not representable in an
540/// MCValue.
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]541
542/// NOTE: It is really important to have both the Asm and Layout arguments.
543/// They might look redundant, but this function can be used before layout
544/// is done (see the object streamer for example) and having the Asm argument
Rafael Espindola1ea7f182010-12-18 04:01:45 +0000[diff] [blame]545/// lets us avoid relaxations early.
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]546static bool EvaluateSymbolicAdd(const MCAssembler *Asm,
547 const MCAsmLayout *Layout,
Rafael Espindola93e3cf02010-12-07 00:27:36 +0000[diff] [blame]548 const SectionAddrMap *Addrs,
Rafael Espindola57ab7082010-12-03 00:55:40 +0000[diff] [blame]549 bool InSet,
Rafael Espindola4262a222010-10-16 18:23:53 +0000[diff] [blame]550 const MCValue &LHS,const MCSymbolRefExpr *RHS_A,
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]551 const MCSymbolRefExpr *RHS_B, int64_t RHS_Cst,
Daniel Dunbar19f847f2009-06-30 02:08:27 +0000[diff] [blame]552 MCValue &Res) {
Daniel Dunbar76793ba2010-12-17 01:07:20 +0000[diff] [blame]553 // FIXME: This routine (and other evaluation parts) are *incredibly* sloppy
554 // about dealing with modifiers. This will ultimately bite us, one day.
555 const MCSymbolRefExpr *LHS_A = LHS.getSymA();
556 const MCSymbolRefExpr *LHS_B = LHS.getSymB();
557 int64_t LHS_Cst = LHS.getConstant();
558
559 // Fold the result constant immediately.
560 int64_t Result_Cst = LHS_Cst + RHS_Cst;
561
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]562 assert((!Layout || Asm) &&
563 "Must have an assembler object if layout is given!");
564
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]565 // If we have a layout, we can fold resolved differences.
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]566 if (Asm) {
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]567 // First, fold out any differences which are fully resolved. By
568 // reassociating terms in
569 // Result = (LHS_A - LHS_B + LHS_Cst) + (RHS_A - RHS_B + RHS_Cst).
570 // we have the four possible differences:
571 // (LHS_A - LHS_B),
572 // (LHS_A - RHS_B),
573 // (RHS_A - LHS_B),
574 // (RHS_A - RHS_B).
Chris Lattner0ab5e2c2011-04-15 05:18:47 +0000[diff] [blame]575 // Since we are attempting to be as aggressive as possible about folding, we
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]576 // attempt to evaluate each possible alternative.
Rafael Espindolaee546362010-12-19 04:18:56 +0000[diff] [blame]577 AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, LHS_A, LHS_B,
578 Result_Cst);
579 AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, LHS_A, RHS_B,
580 Result_Cst);
581 AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, RHS_A, LHS_B,
582 Result_Cst);
583 AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, RHS_A, RHS_B,
584 Result_Cst);
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]585 }
586
Daniel Dunbar76793ba2010-12-17 01:07:20 +0000[diff] [blame]587 // We can't represent the addition or subtraction of two symbols.
588 if ((LHS_A && RHS_A) || (LHS_B && RHS_B))
Daniel Dunbar19f847f2009-06-30 02:08:27 +0000[diff] [blame]589 return false;
590
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]591 // At this point, we have at most one additive symbol and one subtractive
592 // symbol -- find them.
Daniel Dunbar76793ba2010-12-17 01:07:20 +0000[diff] [blame]593 const MCSymbolRefExpr *A = LHS_A ? LHS_A : RHS_A;
594 const MCSymbolRefExpr *B = LHS_B ? LHS_B : RHS_B;
Daniel Dunbar137d4222010-12-17 05:50:33 +0000[diff] [blame]595
596 // If we have a negated symbol, then we must have also have a non-negated
597 // symbol in order to encode the expression.
598 if (B && !A)
599 return false;
Rafael Espindola4262a222010-10-16 18:23:53 +0000[diff] [blame]600
Daniel Dunbar76793ba2010-12-17 01:07:20 +0000[diff] [blame]601 Res = MCValue::get(A, B, Result_Cst);
Daniel Dunbar19f847f2009-06-30 02:08:27 +0000[diff] [blame]602 return true;
603}
604
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]605bool MCExpr::EvaluateAsRelocatable(MCValue &Res,
Rafael Espindola50ce2f02010-12-22 16:11:57 +0000[diff] [blame]606 const MCAsmLayout &Layout) const {
607 return EvaluateAsRelocatableImpl(Res, &Layout.getAssembler(), &Layout,
608 0, false);
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]609}
610
Rafael Espindola4262a222010-10-16 18:23:53 +0000[diff] [blame]611bool MCExpr::EvaluateAsRelocatableImpl(MCValue &Res,
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]612 const MCAssembler *Asm,
Rafael Espindola4262a222010-10-16 18:23:53 +0000[diff] [blame]613 const MCAsmLayout *Layout,
Rafael Espindola93e3cf02010-12-07 00:27:36 +0000[diff] [blame]614 const SectionAddrMap *Addrs,
Rafael Espindola4262a222010-10-16 18:23:53 +0000[diff] [blame]615 bool InSet) const {
Daniel Dunbar5376c2a2010-03-23 23:47:14 +0000[diff] [blame]616 ++stats::MCExprEvaluate;
617
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]618 switch (getKind()) {
Chris Lattner38d022e2010-02-08 19:41:07 +0000[diff] [blame]619 case Target:
Daniel Dunbarac8a9542010-03-11 02:28:59 +0000[diff] [blame]620 return cast<MCTargetExpr>(this)->EvaluateAsRelocatableImpl(Res, Layout);
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]621
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]622 case Constant:
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]623 Res = MCValue::get(cast<MCConstantExpr>(this)->getValue());
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]624 return true;
625
626 case SymbolRef: {
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]627 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(this);
628 const MCSymbol &Sym = SRE->getSymbol();
Daniel Dunbar17b90272009-10-16 01:33:57 +0000[diff] [blame]629
630 // Evaluate recursively if this is a variable.
Rafael Espindola8c3039b2010-11-15 16:33:49 +0000[diff] [blame]631 if (Sym.isVariable() && SRE->getKind() == MCSymbolRefExpr::VK_None) {
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]632 bool Ret = Sym.getVariableValue()->EvaluateAsRelocatableImpl(Res, Asm,
633 Layout,
634 Addrs,
635 true);
Rafael Espindola8c3039b2010-11-15 16:33:49 +0000[diff] [blame]636 // If we failed to simplify this to a constant, let the target
637 // handle it.
638 if (Ret && !Res.getSymA() && !Res.getSymB())
639 return true;
640 }
Daniel Dunbar17b90272009-10-16 01:33:57 +0000[diff] [blame]641
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]642 Res = MCValue::get(SRE, 0, 0);
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]643 return true;
644 }
645
646 case Unary: {
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]647 const MCUnaryExpr *AUE = cast<MCUnaryExpr>(this);
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]648 MCValue Value;
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]649
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]650 if (!AUE->getSubExpr()->EvaluateAsRelocatableImpl(Value, Asm, Layout,
Rafael Espindola93e3cf02010-12-07 00:27:36 +0000[diff] [blame]651 Addrs, InSet))
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]652 return false;
653
654 switch (AUE->getOpcode()) {
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]655 case MCUnaryExpr::LNot:
Daniel Dunbar0d5fc9a2009-07-01 06:48:00 +0000[diff] [blame]656 if (!Value.isAbsolute())
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]657 return false;
658 Res = MCValue::get(!Value.getConstant());
659 break;
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]660 case MCUnaryExpr::Minus:
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]661 /// -(a - b + const) ==> (b - a - const)
Daniel Dunbar7f8a9eb2009-08-11 17:47:52 +0000[diff] [blame]662 if (Value.getSymA() && !Value.getSymB())
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]663 return false;
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]664 Res = MCValue::get(Value.getSymB(), Value.getSymA(),
665 -Value.getConstant());
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]666 break;
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]667 case MCUnaryExpr::Not:
Daniel Dunbar0d5fc9a2009-07-01 06:48:00 +0000[diff] [blame]668 if (!Value.isAbsolute())
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]669 return false;
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]670 Res = MCValue::get(~Value.getConstant());
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]671 break;
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]672 case MCUnaryExpr::Plus:
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]673 Res = Value;
674 break;
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]675 }
676
677 return true;
678 }
679
680 case Binary: {
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]681 const MCBinaryExpr *ABE = cast<MCBinaryExpr>(this);
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]682 MCValue LHSValue, RHSValue;
Daniel Dunbar9c64ec02010-03-18 00:59:10 +0000[diff] [blame]683
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]684 if (!ABE->getLHS()->EvaluateAsRelocatableImpl(LHSValue, Asm, Layout,
Rafael Espindola93e3cf02010-12-07 00:27:36 +0000[diff] [blame]685 Addrs, InSet) ||
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]686 !ABE->getRHS()->EvaluateAsRelocatableImpl(RHSValue, Asm, Layout,
Rafael Espindola93e3cf02010-12-07 00:27:36 +0000[diff] [blame]687 Addrs, InSet))
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]688 return false;
689
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]690 // We only support a few operations on non-constant expressions, handle
691 // those first.
Daniel Dunbar0d5fc9a2009-07-01 06:48:00 +0000[diff] [blame]692 if (!LHSValue.isAbsolute() || !RHSValue.isAbsolute()) {
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]693 switch (ABE->getOpcode()) {
694 default:
695 return false;
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]696 case MCBinaryExpr::Sub:
Daniel Dunbar19f847f2009-06-30 02:08:27 +0000[diff] [blame]697 // Negate RHS and add.
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]698 return EvaluateSymbolicAdd(Asm, Layout, Addrs, InSet, LHSValue,
Daniel Dunbar19f847f2009-06-30 02:08:27 +0000[diff] [blame]699 RHSValue.getSymB(), RHSValue.getSymA(),
700 -RHSValue.getConstant(),
701 Res);
702
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]703 case MCBinaryExpr::Add:
Rafael Espindola5004f4a2010-12-18 03:57:21 +0000[diff] [blame]704 return EvaluateSymbolicAdd(Asm, Layout, Addrs, InSet, LHSValue,
Daniel Dunbar19f847f2009-06-30 02:08:27 +0000[diff] [blame]705 RHSValue.getSymA(), RHSValue.getSymB(),
706 RHSValue.getConstant(),
707 Res);
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]708 }
709 }
710
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]711 // FIXME: We need target hooks for the evaluation. It may be limited in
Dan Gohman9a9d9ea2010-02-08 23:58:47 +0000[diff] [blame]712 // width, and gas defines the result of comparisons and right shifts
713 // differently from Apple as.
Daniel Dunbar39712732009-06-30 16:02:47 +0000[diff] [blame]714 int64_t LHS = LHSValue.getConstant(), RHS = RHSValue.getConstant();
715 int64_t Result = 0;
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]716 switch (ABE->getOpcode()) {
Daniel Dunbar115e4d62009-08-31 08:06:59 +0000[diff] [blame]717 case MCBinaryExpr::Add: Result = LHS + RHS; break;
718 case MCBinaryExpr::And: Result = LHS & RHS; break;
719 case MCBinaryExpr::Div: Result = LHS / RHS; break;
720 case MCBinaryExpr::EQ: Result = LHS == RHS; break;
721 case MCBinaryExpr::GT: Result = LHS > RHS; break;
722 case MCBinaryExpr::GTE: Result = LHS >= RHS; break;
723 case MCBinaryExpr::LAnd: Result = LHS && RHS; break;
724 case MCBinaryExpr::LOr: Result = LHS || RHS; break;
725 case MCBinaryExpr::LT: Result = LHS < RHS; break;
726 case MCBinaryExpr::LTE: Result = LHS <= RHS; break;
727 case MCBinaryExpr::Mod: Result = LHS % RHS; break;
728 case MCBinaryExpr::Mul: Result = LHS * RHS; break;
729 case MCBinaryExpr::NE: Result = LHS != RHS; break;
730 case MCBinaryExpr::Or: Result = LHS | RHS; break;
731 case MCBinaryExpr::Shl: Result = LHS << RHS; break;
732 case MCBinaryExpr::Shr: Result = LHS >> RHS; break;
733 case MCBinaryExpr::Sub: Result = LHS - RHS; break;
734 case MCBinaryExpr::Xor: Result = LHS ^ RHS; break;
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]735 }
736
Daniel Dunbarbd4bf3d2009-06-30 01:49:52 +0000[diff] [blame]737 Res = MCValue::get(Result);
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]738 return true;
739 }
740 }
Daniel Dunbar84bfd7b2009-06-29 20:40:36 +0000[diff] [blame]741
Craig Toppera2886c22012-02-07 05:05:23 +0000[diff] [blame]742 llvm_unreachable("Invalid assembly expression kind!");
Daniel Dunbarf3636452009-08-31 08:07:22 +0000[diff] [blame]743}
Daniel Dunbardc3e4cc2011-04-29 18:00:03 +0000[diff] [blame]744
745const MCSection *MCExpr::FindAssociatedSection() const {
746 switch (getKind()) {
747 case Target:
748 // We never look through target specific expressions.
749 return cast<MCTargetExpr>(this)->FindAssociatedSection();
750
751 case Constant:
752 return MCSymbol::AbsolutePseudoSection;
753
754 case SymbolRef: {
755 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(this);
756 const MCSymbol &Sym = SRE->getSymbol();
757
758 if (Sym.isDefined())
759 return &Sym.getSection();
760
761 return 0;
762 }
763
764 case Unary:
765 return cast<MCUnaryExpr>(this)->getSubExpr()->FindAssociatedSection();
766
767 case Binary: {
768 const MCBinaryExpr *BE = cast<MCBinaryExpr>(this);
769 const MCSection *LHS_S = BE->getLHS()->FindAssociatedSection();
770 const MCSection *RHS_S = BE->getRHS()->FindAssociatedSection();
771
772 // If either section is absolute, return the other.
773 if (LHS_S == MCSymbol::AbsolutePseudoSection)
774 return RHS_S;
775 if (RHS_S == MCSymbol::AbsolutePseudoSection)
776 return LHS_S;
777
778 // Otherwise, return the first non-null section.
779 return LHS_S ? LHS_S : RHS_S;
780 }
781 }
782
Craig Toppera2886c22012-02-07 05:05:23 +0000[diff] [blame]783 llvm_unreachable("Invalid assembly expression kind!");
Daniel Dunbardc3e4cc2011-04-29 18:00:03 +0000[diff] [blame]784}