1//===- MCExpr.h - Assembly Level Expressions --------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef LLVM_MC_MCEXPR_H
10#define LLVM_MC_MCEXPR_H
11
12#include "llvm/ADT/DenseMap.h"
13#include "llvm/Support/SMLoc.h"
14#include <cstdint>
15
16namespace llvm {
17
18class MCAsmInfo;
19class MCAsmLayout;
20class MCAssembler;
21class MCContext;
22class MCFixup;
23class MCFragment;
24class MCSection;
25class MCStreamer;
26class MCSymbol;
27class MCValue;
28class raw_ostream;
29class StringRef;
30
31using SectionAddrMap = DenseMap<const MCSection *, uint64_t>;
32
33/// Base class for the full range of assembler expressions which are
34/// needed for parsing.
35class MCExpr {
36public:
37 enum ExprKind : uint8_t {
38 Binary, ///< Binary expressions.
39 Constant, ///< Constant expressions.
40 SymbolRef, ///< References to labels and assigned expressions.
41 Unary, ///< Unary expressions.
42 Target ///< Target specific expression.
43 };
44
45private:
46 static const unsigned NumSubclassDataBits = 24;
47 static_assert(
48 NumSubclassDataBits == CHAR_BIT * (sizeof(unsigned) - sizeof(ExprKind)),
49 "ExprKind and SubclassData together should take up one word");
50
51 ExprKind Kind;
52 /// Field reserved for use by MCExpr subclasses.
53 unsigned SubclassData : NumSubclassDataBits;
54 SMLoc Loc;
55
56 bool evaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm,
57 const MCAsmLayout *Layout,
58 const SectionAddrMap *Addrs, bool InSet) const;
59
60protected:
61 explicit MCExpr(ExprKind Kind, SMLoc Loc, unsigned SubclassData = 0)
62 : Kind(Kind), SubclassData(SubclassData), Loc(Loc) {
63 assert(SubclassData < (1 << NumSubclassDataBits) &&
64 "Subclass data too large");
65 }
66
67 bool evaluateAsRelocatableImpl(MCValue &Res, const MCAssembler *Asm,
68 const MCAsmLayout *Layout,
69 const MCFixup *Fixup,
70 const SectionAddrMap *Addrs, bool InSet) const;
71
72 unsigned getSubclassData() const { return SubclassData; }
73
74public:
75 MCExpr(const MCExpr &) = delete;
76 MCExpr &operator=(const MCExpr &) = delete;
77
78 /// \name Accessors
79 /// @{
80
81 ExprKind getKind() const { return Kind; }
82 SMLoc getLoc() const { return Loc; }
83
84 /// @}
85 /// \name Utility Methods
86 /// @{
87
88 void print(raw_ostream &OS, const MCAsmInfo *MAI,
89 bool InParens = false) const;
90 void dump() const;
91
92 /// @}
93 /// \name Expression Evaluation
94 /// @{
95
96 /// Try to evaluate the expression to an absolute value.
97 ///
98 /// \param Res - The absolute value, if evaluation succeeds.
99 /// \param Layout - The assembler layout object to use for evaluating symbol
100 /// values. If not given, then only non-symbolic expressions will be
101 /// evaluated.
102 /// \return - True on success.
103 bool evaluateAsAbsolute(int64_t &Res, const MCAsmLayout &Layout,
104 const SectionAddrMap &Addrs) const;
105 bool evaluateAsAbsolute(int64_t &Res) const;
106 bool evaluateAsAbsolute(int64_t &Res, const MCAssembler &Asm) const;
107 bool evaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm) const;
108 bool evaluateAsAbsolute(int64_t &Res, const MCAsmLayout &Layout) const;
109
110 bool evaluateKnownAbsolute(int64_t &Res, const MCAsmLayout &Layout) const;
111
112 /// Try to evaluate the expression to a relocatable value, i.e. an
113 /// expression of the fixed form (a - b + constant).
114 ///
115 /// \param Res - The relocatable value, if evaluation succeeds.
116 /// \param Layout - The assembler layout object to use for evaluating values.
117 /// \param Fixup - The Fixup object if available.
118 /// \return - True on success.
119 bool evaluateAsRelocatable(MCValue &Res, const MCAsmLayout *Layout,
120 const MCFixup *Fixup) const;
121
122 /// Try to evaluate the expression to the form (a - b + constant) where
123 /// neither a nor b are variables.
124 ///
125 /// This is a more aggressive variant of evaluateAsRelocatable. The intended
126 /// use is for when relocations are not available, like the .size directive.
127 bool evaluateAsValue(MCValue &Res, const MCAsmLayout &Layout) const;
128
129 /// Find the "associated section" for this expression, which is
130 /// currently defined as the absolute section for constants, or
131 /// otherwise the section associated with the first defined symbol in the
132 /// expression.
133 MCFragment *findAssociatedFragment() const;
134
135 /// @}
136};
137
138inline raw_ostream &operator<<(raw_ostream &OS, const MCExpr &E) {
139 E.print(OS, MAI: nullptr);
140 return OS;
141}
142
143//// Represent a constant integer expression.
144class MCConstantExpr : public MCExpr {
145 int64_t Value;
146
147 // Subclass data stores SizeInBytes in bits 0..7 and PrintInHex in bit 8.
148 static const unsigned SizeInBytesBits = 8;
149 static const unsigned SizeInBytesMask = (1 << SizeInBytesBits) - 1;
150 static const unsigned PrintInHexBit = 1 << SizeInBytesBits;
151
152 static unsigned encodeSubclassData(bool PrintInHex, unsigned SizeInBytes) {
153 assert(SizeInBytes <= sizeof(int64_t) && "Excessive size");
154 return SizeInBytes | (PrintInHex ? PrintInHexBit : 0);
155 }
156
157 MCConstantExpr(int64_t Value, bool PrintInHex, unsigned SizeInBytes)
158 : MCExpr(MCExpr::Constant, SMLoc(),
159 encodeSubclassData(PrintInHex, SizeInBytes)), Value(Value) {}
160
161public:
162 /// \name Construction
163 /// @{
164
165 static const MCConstantExpr *create(int64_t Value, MCContext &Ctx,
166 bool PrintInHex = false,
167 unsigned SizeInBytes = 0);
168
169 /// @}
170 /// \name Accessors
171 /// @{
172
173 int64_t getValue() const { return Value; }
174 unsigned getSizeInBytes() const {
175 return getSubclassData() & SizeInBytesMask;
176 }
177
178 bool useHexFormat() const { return (getSubclassData() & PrintInHexBit) != 0; }
179
180 /// @}
181
182 static bool classof(const MCExpr *E) {
183 return E->getKind() == MCExpr::Constant;
184 }
185};
186
187/// Represent a reference to a symbol from inside an expression.
188///
189/// A symbol reference in an expression may be a use of a label, a use of an
190/// assembler variable (defined constant), or constitute an implicit definition
191/// of the symbol as external.
192class MCSymbolRefExpr : public MCExpr {
193public:
194 enum VariantKind : uint16_t {
195 VK_None,
196 VK_Invalid,
197
198 VK_GOT,
199 VK_GOTOFF,
200 VK_GOTREL,
201 VK_PCREL,
202 VK_GOTPCREL,
203 VK_GOTPCREL_NORELAX,
204 VK_GOTTPOFF,
205 VK_INDNTPOFF,
206 VK_NTPOFF,
207 VK_GOTNTPOFF,
208 VK_PLT,
209 VK_TLSGD,
210 VK_TLSLD,
211 VK_TLSLDM,
212 VK_TPOFF,
213 VK_DTPOFF,
214 VK_TLSCALL, // symbol(tlscall)
215 VK_TLSDESC, // symbol(tlsdesc)
216 VK_TLVP, // Mach-O thread local variable relocations
217 VK_TLVPPAGE,
218 VK_TLVPPAGEOFF,
219 VK_PAGE,
220 VK_PAGEOFF,
221 VK_GOTPAGE,
222 VK_GOTPAGEOFF,
223 VK_SECREL,
224 VK_SIZE, // symbol@SIZE
225 VK_WEAKREF, // The link between the symbols in .weakref foo, bar
226 VK_FUNCDESC,
227 VK_GOTFUNCDESC,
228 VK_GOTOFFFUNCDESC,
229 VK_TLSGD_FDPIC,
230 VK_TLSLDM_FDPIC,
231 VK_GOTTPOFF_FDPIC,
232
233 VK_X86_ABS8,
234 VK_X86_PLTOFF,
235
236 VK_ARM_NONE,
237 VK_ARM_GOT_PREL,
238 VK_ARM_TARGET1,
239 VK_ARM_TARGET2,
240 VK_ARM_PREL31,
241 VK_ARM_SBREL, // symbol(sbrel)
242 VK_ARM_TLSLDO, // symbol(tlsldo)
243 VK_ARM_TLSDESCSEQ,
244
245 VK_AVR_NONE,
246 VK_AVR_LO8,
247 VK_AVR_HI8,
248 VK_AVR_HLO8,
249 VK_AVR_DIFF8,
250 VK_AVR_DIFF16,
251 VK_AVR_DIFF32,
252 VK_AVR_PM,
253
254 VK_PPC_LO, // symbol@l
255 VK_PPC_HI, // symbol@h
256 VK_PPC_HA, // symbol@ha
257 VK_PPC_HIGH, // symbol@high
258 VK_PPC_HIGHA, // symbol@higha
259 VK_PPC_HIGHER, // symbol@higher
260 VK_PPC_HIGHERA, // symbol@highera
261 VK_PPC_HIGHEST, // symbol@highest
262 VK_PPC_HIGHESTA, // symbol@highesta
263 VK_PPC_GOT_LO, // symbol@got@l
264 VK_PPC_GOT_HI, // symbol@got@h
265 VK_PPC_GOT_HA, // symbol@got@ha
266 VK_PPC_TOCBASE, // symbol@tocbase
267 VK_PPC_TOC, // symbol@toc
268 VK_PPC_TOC_LO, // symbol@toc@l
269 VK_PPC_TOC_HI, // symbol@toc@h
270 VK_PPC_TOC_HA, // symbol@toc@ha
271 VK_PPC_U, // symbol@u
272 VK_PPC_L, // symbol@l
273 VK_PPC_DTPMOD, // symbol@dtpmod
274 VK_PPC_TPREL_LO, // symbol@tprel@l
275 VK_PPC_TPREL_HI, // symbol@tprel@h
276 VK_PPC_TPREL_HA, // symbol@tprel@ha
277 VK_PPC_TPREL_HIGH, // symbol@tprel@high
278 VK_PPC_TPREL_HIGHA, // symbol@tprel@higha
279 VK_PPC_TPREL_HIGHER, // symbol@tprel@higher
280 VK_PPC_TPREL_HIGHERA, // symbol@tprel@highera
281 VK_PPC_TPREL_HIGHEST, // symbol@tprel@highest
282 VK_PPC_TPREL_HIGHESTA, // symbol@tprel@highesta
283 VK_PPC_DTPREL_LO, // symbol@dtprel@l
284 VK_PPC_DTPREL_HI, // symbol@dtprel@h
285 VK_PPC_DTPREL_HA, // symbol@dtprel@ha
286 VK_PPC_DTPREL_HIGH, // symbol@dtprel@high
287 VK_PPC_DTPREL_HIGHA, // symbol@dtprel@higha
288 VK_PPC_DTPREL_HIGHER, // symbol@dtprel@higher
289 VK_PPC_DTPREL_HIGHERA, // symbol@dtprel@highera
290 VK_PPC_DTPREL_HIGHEST, // symbol@dtprel@highest
291 VK_PPC_DTPREL_HIGHESTA, // symbol@dtprel@highesta
292 VK_PPC_GOT_TPREL, // symbol@got@tprel
293 VK_PPC_GOT_TPREL_LO, // symbol@got@tprel@l
294 VK_PPC_GOT_TPREL_HI, // symbol@got@tprel@h
295 VK_PPC_GOT_TPREL_HA, // symbol@got@tprel@ha
296 VK_PPC_GOT_DTPREL, // symbol@got@dtprel
297 VK_PPC_GOT_DTPREL_LO, // symbol@got@dtprel@l
298 VK_PPC_GOT_DTPREL_HI, // symbol@got@dtprel@h
299 VK_PPC_GOT_DTPREL_HA, // symbol@got@dtprel@ha
300 VK_PPC_TLS, // symbol@tls
301 VK_PPC_GOT_TLSGD, // symbol@got@tlsgd
302 VK_PPC_GOT_TLSGD_LO, // symbol@got@tlsgd@l
303 VK_PPC_GOT_TLSGD_HI, // symbol@got@tlsgd@h
304 VK_PPC_GOT_TLSGD_HA, // symbol@got@tlsgd@ha
305 VK_PPC_TLSGD, // symbol@tlsgd
306 VK_PPC_AIX_TLSGD, // symbol@gd
307 VK_PPC_AIX_TLSGDM, // symbol@m
308 VK_PPC_AIX_TLSIE, // symbol@ie
309 VK_PPC_AIX_TLSLE, // symbol@le
310 VK_PPC_AIX_TLSLD, // symbol@ld
311 VK_PPC_AIX_TLSML, // symbol@ml
312 VK_PPC_GOT_TLSLD, // symbol@got@tlsld
313 VK_PPC_GOT_TLSLD_LO, // symbol@got@tlsld@l
314 VK_PPC_GOT_TLSLD_HI, // symbol@got@tlsld@h
315 VK_PPC_GOT_TLSLD_HA, // symbol@got@tlsld@ha
316 VK_PPC_GOT_PCREL, // symbol@got@pcrel
317 VK_PPC_GOT_TLSGD_PCREL, // symbol@got@tlsgd@pcrel
318 VK_PPC_GOT_TLSLD_PCREL, // symbol@got@tlsld@pcrel
319 VK_PPC_GOT_TPREL_PCREL, // symbol@got@tprel@pcrel
320 VK_PPC_TLS_PCREL, // symbol@tls@pcrel
321 VK_PPC_TLSLD, // symbol@tlsld
322 VK_PPC_LOCAL, // symbol@local
323 VK_PPC_NOTOC, // symbol@notoc
324 VK_PPC_PCREL_OPT, // .reloc expr, R_PPC64_PCREL_OPT, expr
325
326 VK_COFF_IMGREL32, // symbol@imgrel (image-relative)
327
328 VK_Hexagon_LO16,
329 VK_Hexagon_HI16,
330 VK_Hexagon_GPREL,
331 VK_Hexagon_GD_GOT,
332 VK_Hexagon_LD_GOT,
333 VK_Hexagon_GD_PLT,
334 VK_Hexagon_LD_PLT,
335 VK_Hexagon_IE,
336 VK_Hexagon_IE_GOT,
337
338 VK_WASM_TYPEINDEX, // Reference to a symbol's type (signature)
339 VK_WASM_TLSREL, // Memory address relative to __tls_base
340 VK_WASM_MBREL, // Memory address relative to __memory_base
341 VK_WASM_TBREL, // Table index relative to __table_base
342 VK_WASM_GOT_TLS, // Wasm global index of TLS symbol.
343 VK_WASM_FUNCINDEX, // Wasm function index.
344
345 VK_AMDGPU_GOTPCREL32_LO, // symbol@gotpcrel32@lo
346 VK_AMDGPU_GOTPCREL32_HI, // symbol@gotpcrel32@hi
347 VK_AMDGPU_REL32_LO, // symbol@rel32@lo
348 VK_AMDGPU_REL32_HI, // symbol@rel32@hi
349 VK_AMDGPU_REL64, // symbol@rel64
350 VK_AMDGPU_ABS32_LO, // symbol@abs32@lo
351 VK_AMDGPU_ABS32_HI, // symbol@abs32@hi
352
353 VK_VE_HI32, // symbol@hi
354 VK_VE_LO32, // symbol@lo
355 VK_VE_PC_HI32, // symbol@pc_hi
356 VK_VE_PC_LO32, // symbol@pc_lo
357 VK_VE_GOT_HI32, // symbol@got_hi
358 VK_VE_GOT_LO32, // symbol@got_lo
359 VK_VE_GOTOFF_HI32, // symbol@gotoff_hi
360 VK_VE_GOTOFF_LO32, // symbol@gotoff_lo
361 VK_VE_PLT_HI32, // symbol@plt_hi
362 VK_VE_PLT_LO32, // symbol@plt_lo
363 VK_VE_TLS_GD_HI32, // symbol@tls_gd_hi
364 VK_VE_TLS_GD_LO32, // symbol@tls_gd_lo
365 VK_VE_TPOFF_HI32, // symbol@tpoff_hi
366 VK_VE_TPOFF_LO32, // symbol@tpoff_lo
367
368 VK_TPREL,
369 VK_DTPREL
370 };
371
372private:
373 /// The symbol being referenced.
374 const MCSymbol *Symbol;
375
376 // Subclass data stores VariantKind in bits 0..15 and HasSubsectionsViaSymbols
377 // in bit 16.
378 static const unsigned VariantKindBits = 16;
379 static const unsigned VariantKindMask = (1 << VariantKindBits) - 1;
380
381 // FIXME: Remove this bit.
382 static const unsigned HasSubsectionsViaSymbolsBit = 1 << VariantKindBits;
383
384 static unsigned encodeSubclassData(VariantKind Kind,
385 bool HasSubsectionsViaSymbols) {
386 return (unsigned)Kind |
387 (HasSubsectionsViaSymbols ? HasSubsectionsViaSymbolsBit : 0);
388 }
389
390 explicit MCSymbolRefExpr(const MCSymbol *Symbol, VariantKind Kind,
391 const MCAsmInfo *MAI, SMLoc Loc = SMLoc());
392
393public:
394 /// \name Construction
395 /// @{
396
397 static const MCSymbolRefExpr *create(const MCSymbol *Symbol, MCContext &Ctx) {
398 return MCSymbolRefExpr::create(Symbol, Kind: VK_None, Ctx);
399 }
400
401 static const MCSymbolRefExpr *create(const MCSymbol *Symbol, VariantKind Kind,
402 MCContext &Ctx, SMLoc Loc = SMLoc());
403 static const MCSymbolRefExpr *create(StringRef Name, VariantKind Kind,
404 MCContext &Ctx);
405
406 /// @}
407 /// \name Accessors
408 /// @{
409
410 const MCSymbol &getSymbol() const { return *Symbol; }
411
412 VariantKind getKind() const {
413 return (VariantKind)(getSubclassData() & VariantKindMask);
414 }
415
416 bool hasSubsectionsViaSymbols() const {
417 return (getSubclassData() & HasSubsectionsViaSymbolsBit) != 0;
418 }
419
420 /// @}
421 /// \name Static Utility Functions
422 /// @{
423
424 static StringRef getVariantKindName(VariantKind Kind);
425
426 static VariantKind getVariantKindForName(StringRef Name);
427
428 /// @}
429
430 static bool classof(const MCExpr *E) {
431 return E->getKind() == MCExpr::SymbolRef;
432 }
433};
434
435/// Unary assembler expressions.
436class MCUnaryExpr : public MCExpr {
437public:
438 enum Opcode {
439 LNot, ///< Logical negation.
440 Minus, ///< Unary minus.
441 Not, ///< Bitwise negation.
442 Plus ///< Unary plus.
443 };
444
445private:
446 const MCExpr *Expr;
447
448 MCUnaryExpr(Opcode Op, const MCExpr *Expr, SMLoc Loc)
449 : MCExpr(MCExpr::Unary, Loc, Op), Expr(Expr) {}
450
451public:
452 /// \name Construction
453 /// @{
454
455 static const MCUnaryExpr *create(Opcode Op, const MCExpr *Expr,
456 MCContext &Ctx, SMLoc Loc = SMLoc());
457
458 static const MCUnaryExpr *createLNot(const MCExpr *Expr, MCContext &Ctx, SMLoc Loc = SMLoc()) {
459 return create(Op: LNot, Expr, Ctx, Loc);
460 }
461
462 static const MCUnaryExpr *createMinus(const MCExpr *Expr, MCContext &Ctx, SMLoc Loc = SMLoc()) {
463 return create(Op: Minus, Expr, Ctx, Loc);
464 }
465
466 static const MCUnaryExpr *createNot(const MCExpr *Expr, MCContext &Ctx, SMLoc Loc = SMLoc()) {
467 return create(Op: Not, Expr, Ctx, Loc);
468 }
469
470 static const MCUnaryExpr *createPlus(const MCExpr *Expr, MCContext &Ctx, SMLoc Loc = SMLoc()) {
471 return create(Op: Plus, Expr, Ctx, Loc);
472 }
473
474 /// @}
475 /// \name Accessors
476 /// @{
477
478 /// Get the kind of this unary expression.
479 Opcode getOpcode() const { return (Opcode)getSubclassData(); }
480
481 /// Get the child of this unary expression.
482 const MCExpr *getSubExpr() const { return Expr; }
483
484 /// @}
485
486 static bool classof(const MCExpr *E) {
487 return E->getKind() == MCExpr::Unary;
488 }
489};
490
491/// Binary assembler expressions.
492class MCBinaryExpr : public MCExpr {
493public:
494 enum Opcode {
495 Add, ///< Addition.
496 And, ///< Bitwise and.
497 Div, ///< Signed division.
498 EQ, ///< Equality comparison.
499 GT, ///< Signed greater than comparison (result is either 0 or some
500 ///< target-specific non-zero value)
501 GTE, ///< Signed greater than or equal comparison (result is either 0 or
502 ///< some target-specific non-zero value).
503 LAnd, ///< Logical and.
504 LOr, ///< Logical or.
505 LT, ///< Signed less than comparison (result is either 0 or
506 ///< some target-specific non-zero value).
507 LTE, ///< Signed less than or equal comparison (result is either 0 or
508 ///< some target-specific non-zero value).
509 Mod, ///< Signed remainder.
510 Mul, ///< Multiplication.
511 NE, ///< Inequality comparison.
512 Or, ///< Bitwise or.
513 OrNot, ///< Bitwise or not.
514 Shl, ///< Shift left.
515 AShr, ///< Arithmetic shift right.
516 LShr, ///< Logical shift right.
517 Sub, ///< Subtraction.
518 Xor ///< Bitwise exclusive or.
519 };
520
521private:
522 const MCExpr *LHS, *RHS;
523
524 MCBinaryExpr(Opcode Op, const MCExpr *LHS, const MCExpr *RHS,
525 SMLoc Loc = SMLoc())
526 : MCExpr(MCExpr::Binary, Loc, Op), LHS(LHS), RHS(RHS) {}
527
528public:
529 /// \name Construction
530 /// @{
531
532 static const MCBinaryExpr *create(Opcode Op, const MCExpr *LHS,
533 const MCExpr *RHS, MCContext &Ctx,
534 SMLoc Loc = SMLoc());
535
536 static const MCBinaryExpr *createAdd(const MCExpr *LHS, const MCExpr *RHS,
537 MCContext &Ctx) {
538 return create(Op: Add, LHS, RHS, Ctx);
539 }
540
541 static const MCBinaryExpr *createAnd(const MCExpr *LHS, const MCExpr *RHS,
542 MCContext &Ctx) {
543 return create(Op: And, LHS, RHS, Ctx);
544 }
545
546 static const MCBinaryExpr *createDiv(const MCExpr *LHS, const MCExpr *RHS,
547 MCContext &Ctx) {
548 return create(Op: Div, LHS, RHS, Ctx);
549 }
550
551 static const MCBinaryExpr *createEQ(const MCExpr *LHS, const MCExpr *RHS,
552 MCContext &Ctx) {
553 return create(Op: EQ, LHS, RHS, Ctx);
554 }
555
556 static const MCBinaryExpr *createGT(const MCExpr *LHS, const MCExpr *RHS,
557 MCContext &Ctx) {
558 return create(Op: GT, LHS, RHS, Ctx);
559 }
560
561 static const MCBinaryExpr *createGTE(const MCExpr *LHS, const MCExpr *RHS,
562 MCContext &Ctx) {
563 return create(Op: GTE, LHS, RHS, Ctx);
564 }
565
566 static const MCBinaryExpr *createLAnd(const MCExpr *LHS, const MCExpr *RHS,
567 MCContext &Ctx) {
568 return create(Op: LAnd, LHS, RHS, Ctx);
569 }
570
571 static const MCBinaryExpr *createLOr(const MCExpr *LHS, const MCExpr *RHS,
572 MCContext &Ctx) {
573 return create(Op: LOr, LHS, RHS, Ctx);
574 }
575
576 static const MCBinaryExpr *createLT(const MCExpr *LHS, const MCExpr *RHS,
577 MCContext &Ctx) {
578 return create(Op: LT, LHS, RHS, Ctx);
579 }
580
581 static const MCBinaryExpr *createLTE(const MCExpr *LHS, const MCExpr *RHS,
582 MCContext &Ctx) {
583 return create(Op: LTE, LHS, RHS, Ctx);
584 }
585
586 static const MCBinaryExpr *createMod(const MCExpr *LHS, const MCExpr *RHS,
587 MCContext &Ctx) {
588 return create(Op: Mod, LHS, RHS, Ctx);
589 }
590
591 static const MCBinaryExpr *createMul(const MCExpr *LHS, const MCExpr *RHS,
592 MCContext &Ctx) {
593 return create(Op: Mul, LHS, RHS, Ctx);
594 }
595
596 static const MCBinaryExpr *createNE(const MCExpr *LHS, const MCExpr *RHS,
597 MCContext &Ctx) {
598 return create(Op: NE, LHS, RHS, Ctx);
599 }
600
601 static const MCBinaryExpr *createOr(const MCExpr *LHS, const MCExpr *RHS,
602 MCContext &Ctx) {
603 return create(Op: Or, LHS, RHS, Ctx);
604 }
605
606 static const MCBinaryExpr *createShl(const MCExpr *LHS, const MCExpr *RHS,
607 MCContext &Ctx) {
608 return create(Op: Shl, LHS, RHS, Ctx);
609 }
610
611 static const MCBinaryExpr *createAShr(const MCExpr *LHS, const MCExpr *RHS,
612 MCContext &Ctx) {
613 return create(Op: AShr, LHS, RHS, Ctx);
614 }
615
616 static const MCBinaryExpr *createLShr(const MCExpr *LHS, const MCExpr *RHS,
617 MCContext &Ctx) {
618 return create(Op: LShr, LHS, RHS, Ctx);
619 }
620
621 static const MCBinaryExpr *createSub(const MCExpr *LHS, const MCExpr *RHS,
622 MCContext &Ctx) {
623 return create(Op: Sub, LHS, RHS, Ctx);
624 }
625
626 static const MCBinaryExpr *createXor(const MCExpr *LHS, const MCExpr *RHS,
627 MCContext &Ctx) {
628 return create(Op: Xor, LHS, RHS, Ctx);
629 }
630
631 /// @}
632 /// \name Accessors
633 /// @{
634
635 /// Get the kind of this binary expression.
636 Opcode getOpcode() const { return (Opcode)getSubclassData(); }
637
638 /// Get the left-hand side expression of the binary operator.
639 const MCExpr *getLHS() const { return LHS; }
640
641 /// Get the right-hand side expression of the binary operator.
642 const MCExpr *getRHS() const { return RHS; }
643
644 /// @}
645
646 static bool classof(const MCExpr *E) {
647 return E->getKind() == MCExpr::Binary;
648 }
649};
650
651/// This is an extension point for target-specific MCExpr subclasses to
652/// implement.
653///
654/// NOTE: All subclasses are required to have trivial destructors because
655/// MCExprs are bump pointer allocated and not destructed.
656class MCTargetExpr : public MCExpr {
657 virtual void anchor();
658
659protected:
660 MCTargetExpr() : MCExpr(Target, SMLoc()) {}
661 virtual ~MCTargetExpr() = default;
662
663public:
664 virtual void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const = 0;
665 virtual bool evaluateAsRelocatableImpl(MCValue &Res,
666 const MCAsmLayout *Layout,
667 const MCFixup *Fixup) const = 0;
668 // allow Target Expressions to be checked for equality
669 virtual bool isEqualTo(const MCExpr *x) const { return false; }
670 // This should be set when assigned expressions are not valid ".set"
671 // expressions, e.g. registers, and must be inlined.
672 virtual bool inlineAssignedExpr() const { return false; }
673 virtual void visitUsedExpr(MCStreamer& Streamer) const = 0;
674 virtual MCFragment *findAssociatedFragment() const = 0;
675
676 virtual void fixELFSymbolsInTLSFixups(MCAssembler &) const = 0;
677
678 static bool classof(const MCExpr *E) {
679 return E->getKind() == MCExpr::Target;
680 }
681};
682
683} // end namespace llvm
684
685#endif // LLVM_MC_MCEXPR_H
686

source code of llvm/include/llvm/MC/MCExpr.h