12 #include "llvm/Config/llvm-config.h"
31 #define DEBUG_TYPE "mcexpr"
36 STATISTIC(MCExprEvaluate,
"Number of MCExpr evaluations");
44 return cast<MCTargetExpr>(
this)->printImpl(OS, MAI);
46 auto Value = cast<MCConstantExpr>(*this).getValue();
47 auto PrintInHex = cast<MCConstantExpr>(*this).useHexFormat();
48 auto SizeInBytes = cast<MCConstantExpr>(*this).getSizeInBytes();
52 switch (SizeInBytes) {
118 if (isa<MCConstantExpr>(BE.
getLHS()) || isa<MCSymbolRefExpr>(BE.
getLHS())) {
130 if (RHSC->getValue() < 0) {
131 OS << RHSC->getValue();
143 case MCBinaryExpr::GTE: OS << ">="; break;
144 case MCBinaryExpr::LAnd: OS << "&&"; break;
145 case MCBinaryExpr::LOr: OS << "||"; break;
146 case MCBinaryExpr::LShr: OS << ">>"; break;
147 case MCBinaryExpr::LT: OS << '<
'; break;
148 case MCBinaryExpr::LTE: OS << "<="; break;
149 case MCBinaryExpr::Mod: OS << '%
'; break;
150 case MCBinaryExpr::Mul: OS << '*
'; break;
151 case MCBinaryExpr::NE: OS << "!="; break;
152 case MCBinaryExpr::Or: OS << '|
'; break;
153 case MCBinaryExpr::OrNot: OS << '!
'; break;
154 case MCBinaryExpr::Shl: OS << "<<"; break;
155 case MCBinaryExpr::Sub: OS << '-
'; break;
156 case MCBinaryExpr::Xor: OS << '^
'; break;
159 // Only print parens around the LHS if it is non-trivial.
160 if (isa<MCConstantExpr>(BE.getRHS()) || isa<MCSymbolRefExpr>(BE.getRHS())) {
161 BE.getRHS()->print(OS, MAI);
164 BE.getRHS()->print(OS, MAI);
171 llvm_unreachable("Invalid expression kind!");
174 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
175 LLVM_DUMP_METHOD void MCExpr::dump() const {
183 const MCBinaryExpr *MCBinaryExpr::create(Opcode Opc, const MCExpr *LHS,
184 const MCExpr *RHS, MCContext &Ctx,
186 return new (Ctx) MCBinaryExpr(Opc, LHS, RHS, Loc);
189 const MCUnaryExpr *MCUnaryExpr::create(Opcode Opc, const MCExpr *Expr,
190 MCContext &Ctx, SMLoc Loc) {
191 return new (Ctx) MCUnaryExpr(Opc, Expr, Loc);
194 const MCConstantExpr *MCConstantExpr::create(int64_t Value, MCContext &Ctx,
196 unsigned SizeInBytes) {
197 return new (Ctx) MCConstantExpr(Value, PrintInHex, SizeInBytes);
202 MCSymbolRefExpr::MCSymbolRefExpr(const MCSymbol *Symbol, VariantKind Kind,
203 const MCAsmInfo *MAI, SMLoc Loc)
204 : MCExpr(MCExpr::SymbolRef, Loc,
205 encodeSubclassData(Kind, MAI->hasSubsectionsViaSymbols())),
210 const MCSymbolRefExpr *MCSymbolRefExpr::create(const MCSymbol *Sym,
212 MCContext &Ctx, SMLoc Loc) {
213 return new (Ctx) MCSymbolRefExpr(Sym, Kind, Ctx.getAsmInfo(), Loc);
216 const MCSymbolRefExpr *MCSymbolRefExpr::create(StringRef Name, VariantKind Kind,
218 return create(Ctx.getOrCreateSymbol(Name), Kind, Ctx);
221 StringRef MCSymbolRefExpr::getVariantKindName(VariantKind Kind) {
223 case VK_Invalid: return "<<invalid>>";
224 case VK_None: return "<<none>>";
226 case VK_DTPOFF: return "DTPOFF";
227 case VK_DTPREL: return "DTPREL";
228 case VK_GOT: return "GOT";
229 case VK_GOTOFF: return "GOTOFF";
230 case VK_GOTREL: return "GOTREL";
231 case VK_PCREL: return "PCREL";
232 case VK_GOTPCREL: return "GOTPCREL";
233 case VK_GOTPCREL_NORELAX: return "GOTPCREL_NORELAX";
234 case VK_GOTTPOFF: return "GOTTPOFF";
235 case VK_INDNTPOFF: return "INDNTPOFF";
236 case VK_NTPOFF: return "NTPOFF";
237 case VK_GOTNTPOFF: return "GOTNTPOFF";
238 case VK_PLT: return "PLT";
239 case VK_TLSGD: return "TLSGD";
240 case VK_TLSLD: return "TLSLD";
241 case VK_TLSLDM: return "TLSLDM";
242 case VK_TPOFF: return "TPOFF";
243 case VK_TPREL: return "TPREL";
244 case VK_TLSCALL: return "tlscall";
245 case VK_TLSDESC: return "tlsdesc";
246 case VK_TLVP: return "TLVP";
247 case VK_TLVPPAGE: return "TLVPPAGE";
248 case VK_TLVPPAGEOFF: return "TLVPPAGEOFF";
249 case VK_PAGE: return "PAGE";
250 case VK_PAGEOFF: return "PAGEOFF";
251 case VK_GOTPAGE: return "GOTPAGE";
252 case VK_GOTPAGEOFF: return "GOTPAGEOFF";
253 case VK_SECREL: return "SECREL32";
254 case VK_SIZE: return "SIZE";
255 case VK_WEAKREF: return "WEAKREF";
256 case VK_X86_ABS8: return "ABS8";
257 case VK_X86_PLTOFF: return "PLTOFF";
258 case VK_ARM_NONE: return "none";
259 case VK_ARM_GOT_PREL: return "GOT_PREL";
260 case VK_ARM_TARGET1: return "target1";
261 case VK_ARM_TARGET2: return "target2";
262 case VK_ARM_PREL31: return "prel31";
263 case VK_ARM_SBREL: return "sbrel";
264 case VK_ARM_TLSLDO: return "tlsldo";
265 case VK_ARM_TLSDESCSEQ: return "tlsdescseq";
266 case VK_AVR_NONE: return "none";
267 case VK_AVR_LO8: return "lo8";
268 case VK_AVR_HI8: return "hi8";
269 case VK_AVR_HLO8: return "hlo8";
270 case VK_AVR_DIFF8: return "diff8";
271 case VK_AVR_DIFF16: return "diff16";
272 case VK_AVR_DIFF32: return "diff32";
273 case VK_AVR_PM: return "pm";
274 case VK_PPC_LO: return "l";
275 case VK_PPC_HI: return "h";
276 case VK_PPC_HA: return "ha";
277 case VK_PPC_HIGH: return "high";
278 case VK_PPC_HIGHA: return "higha";
279 case VK_PPC_HIGHER: return "higher";
280 case VK_PPC_HIGHERA: return "highera";
281 case VK_PPC_HIGHEST: return "highest";
282 case VK_PPC_HIGHESTA: return "highesta";
283 case VK_PPC_GOT_LO: return "got@l";
284 case VK_PPC_GOT_HI: return "got@h";
285 case VK_PPC_GOT_HA: return "got@ha";
286 case VK_PPC_TOCBASE: return "tocbase";
287 case VK_PPC_TOC: return "toc";
288 case VK_PPC_TOC_LO: return "toc@l";
289 case VK_PPC_TOC_HI: return "toc@h";
290 case VK_PPC_TOC_HA: return "toc@ha";
291 case VK_PPC_U: return "u";
292 case VK_PPC_L: return "l";
293 case VK_PPC_DTPMOD: return "dtpmod";
294 case VK_PPC_TPREL_LO: return "tprel@l";
295 case VK_PPC_TPREL_HI: return "tprel@h";
296 case VK_PPC_TPREL_HA: return "tprel@ha";
297 case VK_PPC_TPREL_HIGH: return "tprel@high";
298 case VK_PPC_TPREL_HIGHA: return "tprel@higha";
299 case VK_PPC_TPREL_HIGHER: return "tprel@higher";
300 case VK_PPC_TPREL_HIGHERA: return "tprel@highera";
301 case VK_PPC_TPREL_HIGHEST: return "tprel@highest";
302 case VK_PPC_TPREL_HIGHESTA: return "tprel@highesta";
303 case VK_PPC_DTPREL_LO: return "dtprel@l";
304 case VK_PPC_DTPREL_HI: return "dtprel@h";
305 case VK_PPC_DTPREL_HA: return "dtprel@ha";
306 case VK_PPC_DTPREL_HIGH: return "dtprel@high";
307 case VK_PPC_DTPREL_HIGHA: return "dtprel@higha";
308 case VK_PPC_DTPREL_HIGHER: return "dtprel@higher";
309 case VK_PPC_DTPREL_HIGHERA: return "dtprel@highera";
310 case VK_PPC_DTPREL_HIGHEST: return "dtprel@highest";
311 case VK_PPC_DTPREL_HIGHESTA: return "dtprel@highesta";
312 case VK_PPC_GOT_TPREL: return "got@tprel";
313 case VK_PPC_GOT_TPREL_LO: return "got@tprel@l";
314 case VK_PPC_GOT_TPREL_HI: return "got@tprel@h";
315 case VK_PPC_GOT_TPREL_HA: return "got@tprel@ha";
316 case VK_PPC_GOT_DTPREL: return "got@dtprel";
317 case VK_PPC_GOT_DTPREL_LO: return "got@dtprel@l";
318 case VK_PPC_GOT_DTPREL_HI: return "got@dtprel@h";
319 case VK_PPC_GOT_DTPREL_HA: return "got@dtprel@ha";
320 case VK_PPC_TLS: return "tls";
321 case VK_PPC_GOT_TLSGD: return "got@tlsgd";
322 case VK_PPC_GOT_TLSGD_LO: return "got@tlsgd@l";
323 case VK_PPC_GOT_TLSGD_HI: return "got@tlsgd@h";
324 case VK_PPC_GOT_TLSGD_HA: return "got@tlsgd@ha";
325 case VK_PPC_TLSGD: return "tlsgd";
326 case VK_PPC_AIX_TLSGD:
328 case VK_PPC_AIX_TLSGDM:
330 case VK_PPC_GOT_TLSLD: return "got@tlsld";
331 case VK_PPC_GOT_TLSLD_LO: return "got@tlsld@l";
332 case VK_PPC_GOT_TLSLD_HI: return "got@tlsld@h";
333 case VK_PPC_GOT_TLSLD_HA: return "got@tlsld@ha";
334 case VK_PPC_GOT_PCREL:
336 case VK_PPC_GOT_TLSGD_PCREL:
337 return "got@tlsgd@pcrel";
338 case VK_PPC_GOT_TLSLD_PCREL:
339 return "got@tlsld@pcrel";
340 case VK_PPC_GOT_TPREL_PCREL:
341 return "got@tprel@pcrel";
342 case VK_PPC_TLS_PCREL:
344 case VK_PPC_TLSLD: return "tlsld";
345 case VK_PPC_LOCAL: return "local";
346 case VK_PPC_NOTOC: return "notoc";
347 case VK_PPC_PCREL_OPT: return "<<invalid>>";
348 case VK_COFF_IMGREL32: return "IMGREL";
349 case VK_Hexagon_LO16: return "LO16";
350 case VK_Hexagon_HI16: return "HI16";
351 case VK_Hexagon_GPREL: return "GPREL";
352 case VK_Hexagon_GD_GOT: return "GDGOT";
353 case VK_Hexagon_LD_GOT: return "LDGOT";
354 case VK_Hexagon_GD_PLT: return "GDPLT";
355 case VK_Hexagon_LD_PLT: return "LDPLT";
356 case VK_Hexagon_IE: return "IE";
357 case VK_Hexagon_IE_GOT: return "IEGOT";
358 case VK_WASM_TYPEINDEX: return "TYPEINDEX";
359 case VK_WASM_MBREL: return "MBREL";
360 case VK_WASM_TLSREL: return "TLSREL";
361 case VK_WASM_TBREL: return "TBREL";
362 case VK_WASM_GOT_TLS: return "GOT@TLS";
363 case VK_AMDGPU_GOTPCREL32_LO: return "gotpcrel32@lo";
364 case VK_AMDGPU_GOTPCREL32_HI: return "gotpcrel32@hi";
365 case VK_AMDGPU_REL32_LO: return "rel32@lo";
366 case VK_AMDGPU_REL32_HI: return "rel32@hi";
367 case VK_AMDGPU_REL64: return "rel64";
368 case VK_AMDGPU_ABS32_LO: return "abs32@lo";
369 case VK_AMDGPU_ABS32_HI: return "abs32@hi";
370 case VK_VE_HI32: return "hi";
371 case VK_VE_LO32: return "lo";
372 case VK_VE_PC_HI32: return "pc_hi";
373 case VK_VE_PC_LO32: return "pc_lo";
374 case VK_VE_GOT_HI32: return "got_hi";
375 case VK_VE_GOT_LO32: return "got_lo";
376 case VK_VE_GOTOFF_HI32: return "gotoff_hi";
377 case VK_VE_GOTOFF_LO32: return "gotoff_lo";
378 case VK_VE_PLT_HI32: return "plt_hi";
379 case VK_VE_PLT_LO32: return "plt_lo";
380 case VK_VE_TLS_GD_HI32: return "tls_gd_hi";
381 case VK_VE_TLS_GD_LO32: return "tls_gd_lo";
382 case VK_VE_TPOFF_HI32: return "tpoff_hi";
383 case VK_VE_TPOFF_LO32: return "tpoff_lo";
385 llvm_unreachable("Invalid variant kind");
388 MCSymbolRefExpr::VariantKind
389 MCSymbolRefExpr::getVariantKindForName(StringRef Name) {
390 return StringSwitch<VariantKind>(Name.lower())
391 .Case("dtprel", VK_DTPREL)
392 .Case("dtpoff", VK_DTPOFF)
394 .Case("gotoff", VK_GOTOFF)
395 .Case("gotrel", VK_GOTREL)
396 .Case("pcrel", VK_PCREL)
397 .Case("gotpcrel", VK_GOTPCREL)
398 .Case("gotpcrel_norelax", VK_GOTPCREL_NORELAX)
399 .Case("gottpoff", VK_GOTTPOFF)
400 .Case("indntpoff", VK_INDNTPOFF)
401 .Case("ntpoff", VK_NTPOFF)
402 .Case("gotntpoff", VK_GOTNTPOFF)
404 .Case("tlscall", VK_TLSCALL)
405 .Case("tlsdesc", VK_TLSDESC)
406 .Case("tlsgd", VK_TLSGD)
407 .Case("tlsld", VK_TLSLD)
408 .Case("tlsldm", VK_TLSLDM)
409 .Case("tpoff", VK_TPOFF)
410 .Case("tprel", VK_TPREL)
411 .Case("tlvp", VK_TLVP)
412 .Case("tlvppage", VK_TLVPPAGE)
413 .Case("tlvppageoff", VK_TLVPPAGEOFF)
414 .Case("page", VK_PAGE)
415 .Case("pageoff", VK_PAGEOFF)
416 .Case("gotpage", VK_GOTPAGE)
417 .Case("gotpageoff", VK_GOTPAGEOFF)
418 .Case("imgrel", VK_COFF_IMGREL32)
419 .Case("secrel32", VK_SECREL)
420 .Case("size", VK_SIZE)
421 .Case("abs8", VK_X86_ABS8)
422 .Case("pltoff", VK_X86_PLTOFF)
423 .Case("l", VK_PPC_LO)
424 .Case("h", VK_PPC_HI)
425 .Case("ha", VK_PPC_HA)
426 .Case("high", VK_PPC_HIGH)
427 .Case("higha", VK_PPC_HIGHA)
428 .Case("higher", VK_PPC_HIGHER)
429 .Case("highera", VK_PPC_HIGHERA)
430 .Case("highest", VK_PPC_HIGHEST)
431 .Case("highesta", VK_PPC_HIGHESTA)
432 .Case("got@l", VK_PPC_GOT_LO)
433 .Case("got@h", VK_PPC_GOT_HI)
434 .Case("got@ha", VK_PPC_GOT_HA)
435 .Case("local", VK_PPC_LOCAL)
436 .Case("tocbase", VK_PPC_TOCBASE)
437 .Case("toc", VK_PPC_TOC)
438 .Case("toc@l", VK_PPC_TOC_LO)
439 .Case("toc@h", VK_PPC_TOC_HI)
440 .Case("toc@ha", VK_PPC_TOC_HA)
443 .Case("tls", VK_PPC_TLS)
444 .Case("dtpmod", VK_PPC_DTPMOD)
445 .Case("tprel@l", VK_PPC_TPREL_LO)
446 .Case("tprel@h", VK_PPC_TPREL_HI)
447 .Case("tprel@ha", VK_PPC_TPREL_HA)
448 .Case("tprel@high", VK_PPC_TPREL_HIGH)
449 .Case("tprel@higha", VK_PPC_TPREL_HIGHA)
450 .Case("tprel@higher", VK_PPC_TPREL_HIGHER)
451 .Case("tprel@highera", VK_PPC_TPREL_HIGHERA)
452 .Case("tprel@highest", VK_PPC_TPREL_HIGHEST)
453 .Case("tprel@highesta", VK_PPC_TPREL_HIGHESTA)
454 .Case("dtprel@l", VK_PPC_DTPREL_LO)
455 .Case("dtprel@h", VK_PPC_DTPREL_HI)
456 .Case("dtprel@ha", VK_PPC_DTPREL_HA)
457 .Case("dtprel@high", VK_PPC_DTPREL_HIGH)
458 .Case("dtprel@higha", VK_PPC_DTPREL_HIGHA)
459 .Case("dtprel@higher", VK_PPC_DTPREL_HIGHER)
460 .Case("dtprel@highera", VK_PPC_DTPREL_HIGHERA)
461 .Case("dtprel@highest", VK_PPC_DTPREL_HIGHEST)
462 .Case("dtprel@highesta", VK_PPC_DTPREL_HIGHESTA)
463 .Case("got@tprel", VK_PPC_GOT_TPREL)
464 .Case("got@tprel@l", VK_PPC_GOT_TPREL_LO)
465 .Case("got@tprel@h", VK_PPC_GOT_TPREL_HI)
466 .Case("got@tprel@ha", VK_PPC_GOT_TPREL_HA)
467 .Case("got@dtprel", VK_PPC_GOT_DTPREL)
468 .Case("got@dtprel@l", VK_PPC_GOT_DTPREL_LO)
469 .Case("got@dtprel@h", VK_PPC_GOT_DTPREL_HI)
470 .Case("got@dtprel@ha", VK_PPC_GOT_DTPREL_HA)
471 .Case("got@tlsgd", VK_PPC_GOT_TLSGD)
472 .Case("got@tlsgd@l", VK_PPC_GOT_TLSGD_LO)
473 .Case("got@tlsgd@h", VK_PPC_GOT_TLSGD_HI)
474 .Case("got@tlsgd@ha", VK_PPC_GOT_TLSGD_HA)
475 .Case("got@tlsld", VK_PPC_GOT_TLSLD)
476 .Case("got@tlsld@l", VK_PPC_GOT_TLSLD_LO)
477 .Case("got@tlsld@h", VK_PPC_GOT_TLSLD_HI)
478 .Case("got@tlsld@ha", VK_PPC_GOT_TLSLD_HA)
479 .Case("got@pcrel", VK_PPC_GOT_PCREL)
480 .Case("got@tlsgd@pcrel", VK_PPC_GOT_TLSGD_PCREL)
481 .Case("got@tlsld@pcrel", VK_PPC_GOT_TLSLD_PCREL)
482 .Case("got@tprel@pcrel", VK_PPC_GOT_TPREL_PCREL)
483 .Case("tls@pcrel", VK_PPC_TLS_PCREL)
484 .Case("notoc", VK_PPC_NOTOC)
485 .Case("gdgot", VK_Hexagon_GD_GOT)
486 .Case("gdplt", VK_Hexagon_GD_PLT)
487 .Case("iegot", VK_Hexagon_IE_GOT)
488 .Case("ie", VK_Hexagon_IE)
489 .Case("ldgot", VK_Hexagon_LD_GOT)
490 .Case("ldplt", VK_Hexagon_LD_PLT)
491 .Case("none", VK_ARM_NONE)
492 .Case("got_prel", VK_ARM_GOT_PREL)
493 .Case("target1", VK_ARM_TARGET1)
494 .Case("target2", VK_ARM_TARGET2)
495 .Case("prel31", VK_ARM_PREL31)
496 .Case("sbrel", VK_ARM_SBREL)
497 .Case("tlsldo", VK_ARM_TLSLDO)
498 .Case("lo8", VK_AVR_LO8)
499 .Case("hi8", VK_AVR_HI8)
500 .Case("hlo8", VK_AVR_HLO8)
501 .Case("typeindex", VK_WASM_TYPEINDEX)
502 .Case("tbrel", VK_WASM_TBREL)
503 .Case("mbrel", VK_WASM_MBREL)
504 .Case("tlsrel", VK_WASM_TLSREL)
505 .Case("got@tls", VK_WASM_GOT_TLS)
506 .Case("gotpcrel32@lo", VK_AMDGPU_GOTPCREL32_LO)
507 .Case("gotpcrel32@hi", VK_AMDGPU_GOTPCREL32_HI)
508 .Case("rel32@lo", VK_AMDGPU_REL32_LO)
509 .Case("rel32@hi", VK_AMDGPU_REL32_HI)
510 .Case("rel64", VK_AMDGPU_REL64)
511 .Case("abs32@lo", VK_AMDGPU_ABS32_LO)
512 .Case("abs32@hi", VK_AMDGPU_ABS32_HI)
513 .Case("hi", VK_VE_HI32)
514 .Case("lo", VK_VE_LO32)
515 .Case("pc_hi", VK_VE_PC_HI32)
516 .Case("pc_lo", VK_VE_PC_LO32)
517 .Case("got_hi", VK_VE_GOT_HI32)
518 .Case("got_lo", VK_VE_GOT_LO32)
519 .Case("gotoff_hi", VK_VE_GOTOFF_HI32)
520 .Case("gotoff_lo", VK_VE_GOTOFF_LO32)
521 .Case("plt_hi", VK_VE_PLT_HI32)
522 .Case("plt_lo", VK_VE_PLT_LO32)
523 .Case("tls_gd_hi", VK_VE_TLS_GD_HI32)
524 .Case("tls_gd_lo", VK_VE_TLS_GD_LO32)
525 .Case("tpoff_hi", VK_VE_TPOFF_HI32)
526 .Case("tpoff_lo", VK_VE_TPOFF_LO32)
527 .Default(VK_Invalid);
532 void MCTargetExpr::anchor() {}
536 bool MCExpr::evaluateAsAbsolute(int64_t &Res) const {
537 return evaluateAsAbsolute(Res, nullptr, nullptr, nullptr, false);
540 bool MCExpr::evaluateAsAbsolute(int64_t &Res,
541 const MCAsmLayout &Layout) const {
542 return evaluateAsAbsolute(Res, &Layout.getAssembler(), &Layout, nullptr, false);
545 bool MCExpr::evaluateAsAbsolute(int64_t &Res,
546 const MCAsmLayout &Layout,
547 const SectionAddrMap &Addrs) const {
548 // Setting InSet causes us to absolutize differences across sections and that
549 // is what the MachO writer uses Addrs for.
550 return evaluateAsAbsolute(Res, &Layout.getAssembler(), &Layout, &Addrs, true);
553 bool MCExpr::evaluateAsAbsolute(int64_t &Res, const MCAssembler &Asm) const {
554 return evaluateAsAbsolute(Res, &Asm, nullptr, nullptr, false);
557 bool MCExpr::evaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm) const {
558 return evaluateAsAbsolute(Res, Asm, nullptr, nullptr, false);
561 bool MCExpr::evaluateKnownAbsolute(int64_t &Res,
562 const MCAsmLayout &Layout) const {
563 return evaluateAsAbsolute(Res, &Layout.getAssembler(), &Layout, nullptr,
567 bool MCExpr::evaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm,
568 const MCAsmLayout *Layout,
569 const SectionAddrMap *Addrs, bool InSet) const {
572 // Fast path constants.
573 if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(this)) {
574 Res = CE->getValue();
579 evaluateAsRelocatableImpl(Value, Asm, Layout, nullptr, Addrs, InSet);
581 // Record the current value.
582 Res = Value.getConstant();
584 return IsRelocatable && Value.isAbsolute();
588 static void AttemptToFoldSymbolOffsetDifference(
589 const MCAssembler *Asm, const MCAsmLayout *Layout,
590 const SectionAddrMap *Addrs, bool InSet, const MCSymbolRefExpr *&A,
591 const MCSymbolRefExpr *&B, int64_t &Addend) {
595 const MCSymbol &SA = A->getSymbol();
596 const MCSymbol &SB = B->getSymbol();
598 if (SA.isUndefined() || SB.isUndefined())
601 if (!Asm->getWriter().isSymbolRefDifferenceFullyResolved(*Asm, A, B, InSet))
604 auto FinalizeFolding = [&]() {
605 // Pointers to Thumb symbols need to have their low-bit set to allow
607 if (Asm->isThumbFunc(&SA))
610 // If symbol is labeled as micromips, we set low-bit to ensure
611 // correct offset in .gcc_except_table
612 if (Asm->getBackend().isMicroMips(&SA))
615 // Clear the symbol expr pointers to indicate we have folded these
620 const MCFragment *FA = SA.getFragment();
621 const MCFragment *FB = SB.getFragment();
622 // If both symbols are in the same fragment, return the difference of their
624 if (FA == FB && !SA.isVariable() && !SA.isUnset() && !SB.isVariable() &&
626 Addend += SA.getOffset() - SB.getOffset();
627 return FinalizeFolding();
630 const MCSection &SecA = *FA->getParent();
631 const MCSection &SecB = *FB->getParent();
633 if ((&SecA != &SecB) && !Addrs)
637 // One of the symbol involved is part of a fragment being laid out. Quit now
638 // to avoid a self loop.
639 if (!Layout->canGetFragmentOffset(FA) || !Layout->canGetFragmentOffset(FB))
642 // Eagerly evaluate when layout is finalized.
643 Addend += Layout->getSymbolOffset(A->getSymbol()) -
644 Layout->getSymbolOffset(B->getSymbol());
645 if (Addrs && (&SecA != &SecB))
646 Addend += (Addrs->lookup(&SecA) - Addrs->lookup(&SecB));
650 // When layout is not finalized, our ability to resolve differences between
651 // symbols is limited to specific cases where the fragments between two
652 // symbols (including the fragments the symbols are defined in) are
653 // fixed-size fragments so the difference can be calculated. For example,
654 // this is important when the Subtarget is changed and a new MCDataFragment
655 // is created in the case of foo: instr; .arch_extension ext; instr .if . -
657 if (SA.isVariable() || SA.isUnset() || SB.isVariable() || SB.isUnset() ||
658 FA->getKind() != MCFragment::FT_Data ||
659 FB->getKind() != MCFragment::FT_Data ||
660 FA->getSubsectionNumber() != FB->getSubsectionNumber())
662 // Try to find a constant displacement from FA to FB, add the displacement
663 // between the offset in FA of SA and the offset in FB of SB.
664 int64_t Displacement = SA.getOffset() - SB.getOffset();
665 for (auto FI = FB->getIterator(), FE = SecA.end(); FI != FE; ++FI) {
667 Addend += Displacement;
668 return FinalizeFolding();
671 if (FI->getKind() != MCFragment::FT_Data)
673 Displacement += cast<MCDataFragment>(FI)->getContents().size();
698 EvaluateSymbolicAdd(const MCAssembler *Asm, const MCAsmLayout *Layout,
699 const SectionAddrMap *Addrs, bool InSet, const MCValue &LHS,
700 const MCSymbolRefExpr *RHS_A, const MCSymbolRefExpr *RHS_B,
701 int64_t RHS_Cst, MCValue &Res) {
702 // FIXME: This routine (and other evaluation parts) are *incredibly* sloppy
703 // about dealing with modifiers. This will ultimately bite us, one day.
704 const MCSymbolRefExpr *LHS_A = LHS.getSymA();
705 const MCSymbolRefExpr *LHS_B = LHS.getSymB();
706 int64_t LHS_Cst = LHS.getConstant();
708 // Fold the result constant immediately.
709 int64_t Result_Cst = LHS_Cst + RHS_Cst;
711 assert((!Layout || Asm) &&
712 "Must have an assembler object if layout is given!");
714 // If we have a layout, we can fold resolved differences.
716 // First, fold out any differences which are fully resolved. By
717 // reassociating terms in
718 // Result = (LHS_A - LHS_B + LHS_Cst) + (RHS_A - RHS_B + RHS_Cst).
719 // we have the four possible differences:
724 // Since we are attempting to be as aggressive as possible about folding, we
725 // attempt to evaluate each possible alternative.
726 AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, LHS_A, LHS_B,
728 AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, LHS_A, RHS_B,
730 AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, RHS_A, LHS_B,
732 AttemptToFoldSymbolOffsetDifference(Asm, Layout, Addrs, InSet, RHS_A, RHS_B,
736 // We can'
t represent the addition
or subtraction
of two
symbols.
737 if ((LHS_A && RHS_A) || (LHS_B && RHS_B))
765 const auto *Inner = dyn_cast<MCSymbolRefExpr>(Expr);
781 ++stats::MCExprEvaluate;
785 return cast<MCTargetExpr>(
this)->evaluateAsRelocatableImpl(Res, Layout,
789 Res =
MCValue::get(cast<MCConstantExpr>(
this)->getValue());
795 const auto Kind = SRE->
getKind();
802 Res,
Asm, Layout,
Fixup, Addrs, InSet || IsMachO)) {
816 Kind,
Asm->getContext()),
853 if (!
Value.isAbsolute())
867 if (!
Value.isAbsolute())
991 return cast<MCTargetExpr>(
this)->findAssociatedFragment();
1003 return cast<MCUnaryExpr>(
this)->getSubExpr()->findAssociatedFragment();
1021 return LHS_F ? LHS_F : RHS_F;