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, 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
227 VK_X86_ABS8,
228 VK_X86_PLTOFF,
229
230 VK_ARM_NONE,
231 VK_ARM_GOT_PREL,
232 VK_ARM_TARGET1,
233 VK_ARM_TARGET2,
234 VK_ARM_PREL31,
235 VK_ARM_SBREL, // symbol(sbrel)
236 VK_ARM_TLSLDO, // symbol(tlsldo)
237 VK_ARM_TLSDESCSEQ,
238
239 VK_AVR_NONE,
240 VK_AVR_LO8,
241 VK_AVR_HI8,
242 VK_AVR_HLO8,
243 VK_AVR_DIFF8,
244 VK_AVR_DIFF16,
245 VK_AVR_DIFF32,
246 VK_AVR_PM,
247
248 VK_PPC_LO, // symbol@l
249 VK_PPC_HI, // symbol@h
250 VK_PPC_HA, // symbol@ha
251 VK_PPC_HIGH, // symbol@high
252 VK_PPC_HIGHA, // symbol@higha
253 VK_PPC_HIGHER, // symbol@higher
254 VK_PPC_HIGHERA, // symbol@highera
255 VK_PPC_HIGHEST, // symbol@highest
256 VK_PPC_HIGHESTA, // symbol@highesta
257 VK_PPC_GOT_LO, // symbol@got@l
258 VK_PPC_GOT_HI, // symbol@got@h
259 VK_PPC_GOT_HA, // symbol@got@ha
260 VK_PPC_TOCBASE, // symbol@tocbase
261 VK_PPC_TOC, // symbol@toc
262 VK_PPC_TOC_LO, // symbol@toc@l
263 VK_PPC_TOC_HI, // symbol@toc@h
264 VK_PPC_TOC_HA, // symbol@toc@ha
265 VK_PPC_U, // symbol@u
266 VK_PPC_L, // symbol@l
267 VK_PPC_DTPMOD, // symbol@dtpmod
268 VK_PPC_TPREL_LO, // symbol@tprel@l
269 VK_PPC_TPREL_HI, // symbol@tprel@h
270 VK_PPC_TPREL_HA, // symbol@tprel@ha
271 VK_PPC_TPREL_HIGH, // symbol@tprel@high
272 VK_PPC_TPREL_HIGHA, // symbol@tprel@higha
273 VK_PPC_TPREL_HIGHER, // symbol@tprel@higher
274 VK_PPC_TPREL_HIGHERA, // symbol@tprel@highera
275 VK_PPC_TPREL_HIGHEST, // symbol@tprel@highest
276 VK_PPC_TPREL_HIGHESTA, // symbol@tprel@highesta
277 VK_PPC_DTPREL_LO, // symbol@dtprel@l
278 VK_PPC_DTPREL_HI, // symbol@dtprel@h
279 VK_PPC_DTPREL_HA, // symbol@dtprel@ha
280 VK_PPC_DTPREL_HIGH, // symbol@dtprel@high
281 VK_PPC_DTPREL_HIGHA, // symbol@dtprel@higha
282 VK_PPC_DTPREL_HIGHER, // symbol@dtprel@higher
283 VK_PPC_DTPREL_HIGHERA, // symbol@dtprel@highera
284 VK_PPC_DTPREL_HIGHEST, // symbol@dtprel@highest
285 VK_PPC_DTPREL_HIGHESTA, // symbol@dtprel@highesta
286 VK_PPC_GOT_TPREL, // symbol@got@tprel
287 VK_PPC_GOT_TPREL_LO, // symbol@got@tprel@l
288 VK_PPC_GOT_TPREL_HI, // symbol@got@tprel@h
289 VK_PPC_GOT_TPREL_HA, // symbol@got@tprel@ha
290 VK_PPC_GOT_DTPREL, // symbol@got@dtprel
291 VK_PPC_GOT_DTPREL_LO, // symbol@got@dtprel@l
292 VK_PPC_GOT_DTPREL_HI, // symbol@got@dtprel@h
293 VK_PPC_GOT_DTPREL_HA, // symbol@got@dtprel@ha
294 VK_PPC_TLS, // symbol@tls
295 VK_PPC_GOT_TLSGD, // symbol@got@tlsgd
296 VK_PPC_GOT_TLSGD_LO, // symbol@got@tlsgd@l
297 VK_PPC_GOT_TLSGD_HI, // symbol@got@tlsgd@h
298 VK_PPC_GOT_TLSGD_HA, // symbol@got@tlsgd@ha
299 VK_PPC_TLSGD, // symbol@tlsgd
300 VK_PPC_AIX_TLSGD, // symbol@gd
301 VK_PPC_AIX_TLSGDM, // symbol@m
302 VK_PPC_GOT_TLSLD, // symbol@got@tlsld
303 VK_PPC_GOT_TLSLD_LO, // symbol@got@tlsld@l
304 VK_PPC_GOT_TLSLD_HI, // symbol@got@tlsld@h
305 VK_PPC_GOT_TLSLD_HA, // symbol@got@tlsld@ha
306 VK_PPC_GOT_PCREL, // symbol@got@pcrel
307 VK_PPC_GOT_TLSGD_PCREL, // symbol@got@tlsgd@pcrel
308 VK_PPC_GOT_TLSLD_PCREL, // symbol@got@tlsld@pcrel
309 VK_PPC_GOT_TPREL_PCREL, // symbol@got@tprel@pcrel
310 VK_PPC_TLS_PCREL, // symbol@tls@pcrel
311 VK_PPC_TLSLD, // symbol@tlsld
312 VK_PPC_LOCAL, // symbol@local
313 VK_PPC_NOTOC, // symbol@notoc
314 VK_PPC_PCREL_OPT, // .reloc expr, R_PPC64_PCREL_OPT, expr
315
316 VK_COFF_IMGREL32, // symbol@imgrel (image-relative)
317
318 VK_Hexagon_LO16,
319 VK_Hexagon_HI16,
320 VK_Hexagon_GPREL,
321 VK_Hexagon_GD_GOT,
322 VK_Hexagon_LD_GOT,
323 VK_Hexagon_GD_PLT,
324 VK_Hexagon_LD_PLT,
325 VK_Hexagon_IE,
326 VK_Hexagon_IE_GOT,
327
328 VK_WASM_TYPEINDEX, // Reference to a symbol's type (signature)
329 VK_WASM_TLSREL, // Memory address relative to __tls_base
330 VK_WASM_MBREL, // Memory address relative to __memory_base
331 VK_WASM_TBREL, // Table index relative to __table_base
332 VK_WASM_GOT_TLS, // Wasm global index of TLS symbol.
333
334 VK_AMDGPU_GOTPCREL32_LO, // symbol@gotpcrel32@lo
335 VK_AMDGPU_GOTPCREL32_HI, // symbol@gotpcrel32@hi
336 VK_AMDGPU_REL32_LO, // symbol@rel32@lo
337 VK_AMDGPU_REL32_HI, // symbol@rel32@hi
338 VK_AMDGPU_REL64, // symbol@rel64
339 VK_AMDGPU_ABS32_LO, // symbol@abs32@lo
340 VK_AMDGPU_ABS32_HI, // symbol@abs32@hi
341
342 VK_VE_HI32, // symbol@hi
343 VK_VE_LO32, // symbol@lo
344 VK_VE_PC_HI32, // symbol@pc_hi
345 VK_VE_PC_LO32, // symbol@pc_lo
346 VK_VE_GOT_HI32, // symbol@got_hi
347 VK_VE_GOT_LO32, // symbol@got_lo
348 VK_VE_GOTOFF_HI32, // symbol@gotoff_hi
349 VK_VE_GOTOFF_LO32, // symbol@gotoff_lo
350 VK_VE_PLT_HI32, // symbol@plt_hi
351 VK_VE_PLT_LO32, // symbol@plt_lo
352 VK_VE_TLS_GD_HI32, // symbol@tls_gd_hi
353 VK_VE_TLS_GD_LO32, // symbol@tls_gd_lo
354 VK_VE_TPOFF_HI32, // symbol@tpoff_hi
355 VK_VE_TPOFF_LO32, // symbol@tpoff_lo
356
357 VK_TPREL,
358 VK_DTPREL
359 };
360
361private:
362 /// The symbol being referenced.
363 const MCSymbol *Symbol;
364
365 // Subclass data stores VariantKind in bits 0..15 and HasSubsectionsViaSymbols
366 // in bit 16.
367 static const unsigned VariantKindBits = 16;
368 static const unsigned VariantKindMask = (1 << VariantKindBits) - 1;
369
370 // FIXME: Remove this bit.
371 static const unsigned HasSubsectionsViaSymbolsBit = 1 << VariantKindBits;
372
373 static unsigned encodeSubclassData(VariantKind Kind,
374 bool HasSubsectionsViaSymbols) {
375 return (unsigned)Kind |
376 (HasSubsectionsViaSymbols ? HasSubsectionsViaSymbolsBit : 0);
377 }
378
379 explicit MCSymbolRefExpr(const MCSymbol *Symbol, VariantKind Kind,
380 const MCAsmInfo *MAI, SMLoc Loc = SMLoc());
381
382public:
383 /// \name Construction
384 /// @{
385
386 static const MCSymbolRefExpr *create(const MCSymbol *Symbol, MCContext &Ctx) {
387 return MCSymbolRefExpr::create(Symbol, VK_None, Ctx);
388 }
389
390 static const MCSymbolRefExpr *create(const MCSymbol *Symbol, VariantKind Kind,
391 MCContext &Ctx, SMLoc Loc = SMLoc());
392 static const MCSymbolRefExpr *create(StringRef Name, VariantKind Kind,
393 MCContext &Ctx);
394
395 /// @}
396 /// \name Accessors
397 /// @{
398
399 const MCSymbol &getSymbol() const { return *Symbol; }
400
401 VariantKind getKind() const {
402 return (VariantKind)(getSubclassData() & VariantKindMask);
403 }
404
405 bool hasSubsectionsViaSymbols() const {
406 return (getSubclassData() & HasSubsectionsViaSymbolsBit) != 0;
407 }
408
409 /// @}
410 /// \name Static Utility Functions
411 /// @{
412
413 static StringRef getVariantKindName(VariantKind Kind);
414
415 static VariantKind getVariantKindForName(StringRef Name);
416
417 /// @}
418
419 static bool classof(const MCExpr *E) {
420 return E->getKind() == MCExpr::SymbolRef;
421 }
422};
423
424/// Unary assembler expressions.
425class MCUnaryExpr : public MCExpr {
426public:
427 enum Opcode {
428 LNot, ///< Logical negation.
429 Minus, ///< Unary minus.
430 Not, ///< Bitwise negation.
431 Plus ///< Unary plus.
432 };
433
434private:
435 const MCExpr *Expr;
436
437 MCUnaryExpr(Opcode Op, const MCExpr *Expr, SMLoc Loc)
438 : MCExpr(MCExpr::Unary, Loc, Op), Expr(Expr) {}
439
440public:
441 /// \name Construction
442 /// @{
443
444 static const MCUnaryExpr *create(Opcode Op, const MCExpr *Expr,
445 MCContext &Ctx, SMLoc Loc = SMLoc());
446
447 static const MCUnaryExpr *createLNot(const MCExpr *Expr, MCContext &Ctx, SMLoc Loc = SMLoc()) {
448 return create(LNot, Expr, Ctx, Loc);
449 }
450
451 static const MCUnaryExpr *createMinus(const MCExpr *Expr, MCContext &Ctx, SMLoc Loc = SMLoc()) {
452 return create(Minus, Expr, Ctx, Loc);
453 }
454
455 static const MCUnaryExpr *createNot(const MCExpr *Expr, MCContext &Ctx, SMLoc Loc = SMLoc()) {
456 return create(Not, Expr, Ctx, Loc);
457 }
458
459 static const MCUnaryExpr *createPlus(const MCExpr *Expr, MCContext &Ctx, SMLoc Loc = SMLoc()) {
460 return create(Plus, Expr, Ctx, Loc);
461 }
462
463 /// @}
464 /// \name Accessors
465 /// @{
466
467 /// Get the kind of this unary expression.
468 Opcode getOpcode() const { return (Opcode)getSubclassData(); }
469
470 /// Get the child of this unary expression.
471 const MCExpr *getSubExpr() const { return Expr; }
472
473 /// @}
474
475 static bool classof(const MCExpr *E) {
476 return E->getKind() == MCExpr::Unary;
477 }
478};
479
480/// Binary assembler expressions.
481class MCBinaryExpr : public MCExpr {
482public:
483 enum Opcode {
484 Add, ///< Addition.
485 And, ///< Bitwise and.
486 Div, ///< Signed division.
487 EQ, ///< Equality comparison.
488 GT, ///< Signed greater than comparison (result is either 0 or some
489 ///< target-specific non-zero value)
490 GTE, ///< Signed greater than or equal comparison (result is either 0 or
491 ///< some target-specific non-zero value).
492 LAnd, ///< Logical and.
493 LOr, ///< Logical or.
494 LT, ///< Signed less than comparison (result is either 0 or
495 ///< some target-specific non-zero value).
496 LTE, ///< Signed less than or equal comparison (result is either 0 or
497 ///< some target-specific non-zero value).
498 Mod, ///< Signed remainder.
499 Mul, ///< Multiplication.
500 NE, ///< Inequality comparison.
501 Or, ///< Bitwise or.
502 OrNot, ///< Bitwise or not.
503 Shl, ///< Shift left.
504 AShr, ///< Arithmetic shift right.
505 LShr, ///< Logical shift right.
506 Sub, ///< Subtraction.
507 Xor ///< Bitwise exclusive or.
508 };
509
510private:
511 const MCExpr *LHS, *RHS;
512
513 MCBinaryExpr(Opcode Op, const MCExpr *LHS, const MCExpr *RHS,
514 SMLoc Loc = SMLoc())
515 : MCExpr(MCExpr::Binary, Loc, Op), LHS(LHS), RHS(RHS) {}
516
517public:
518 /// \name Construction
519 /// @{
520
521 static const MCBinaryExpr *create(Opcode Op, const MCExpr *LHS,
522 const MCExpr *RHS, MCContext &Ctx,
523 SMLoc Loc = SMLoc());
524
525 static const MCBinaryExpr *createAdd(const MCExpr *LHS, const MCExpr *RHS,
526 MCContext &Ctx) {
527 return create(Add, LHS, RHS, Ctx);
528 }
529
530 static const MCBinaryExpr *createAnd(const MCExpr *LHS, const MCExpr *RHS,
531 MCContext &Ctx) {
532 return create(And, LHS, RHS, Ctx);
533 }
534
535 static const MCBinaryExpr *createDiv(const MCExpr *LHS, const MCExpr *RHS,
536 MCContext &Ctx) {
537 return create(Div, LHS, RHS, Ctx);
538 }
539
540 static const MCBinaryExpr *createEQ(const MCExpr *LHS, const MCExpr *RHS,
541 MCContext &Ctx) {
542 return create(EQ, LHS, RHS, Ctx);
543 }
544
545 static const MCBinaryExpr *createGT(const MCExpr *LHS, const MCExpr *RHS,
546 MCContext &Ctx) {
547 return create(GT, LHS, RHS, Ctx);
548 }
549
550 static const MCBinaryExpr *createGTE(const MCExpr *LHS, const MCExpr *RHS,
551 MCContext &Ctx) {
552 return create(GTE, LHS, RHS, Ctx);
553 }
554
555 static const MCBinaryExpr *createLAnd(const MCExpr *LHS, const MCExpr *RHS,
556 MCContext &Ctx) {
557 return create(LAnd, LHS, RHS, Ctx);
558 }
559
560 static const MCBinaryExpr *createLOr(const MCExpr *LHS, const MCExpr *RHS,
561 MCContext &Ctx) {
562 return create(LOr, LHS, RHS, Ctx);
563 }
564
565 static const MCBinaryExpr *createLT(const MCExpr *LHS, const MCExpr *RHS,
566 MCContext &Ctx) {
567 return create(LT, LHS, RHS, Ctx);
568 }
569
570 static const MCBinaryExpr *createLTE(const MCExpr *LHS, const MCExpr *RHS,
571 MCContext &Ctx) {
572 return create(LTE, LHS, RHS, Ctx);
573 }
574
575 static const MCBinaryExpr *createMod(const MCExpr *LHS, const MCExpr *RHS,
576 MCContext &Ctx) {
577 return create(Mod, LHS, RHS, Ctx);
578 }
579
580 static const MCBinaryExpr *createMul(const MCExpr *LHS, const MCExpr *RHS,
581 MCContext &Ctx) {
582 return create(Mul, LHS, RHS, Ctx);
583 }
584
585 static const MCBinaryExpr *createNE(const MCExpr *LHS, const MCExpr *RHS,
586 MCContext &Ctx) {
587 return create(NE, LHS, RHS, Ctx);
588 }
589
590 static const MCBinaryExpr *createOr(const MCExpr *LHS, const MCExpr *RHS,
591 MCContext &Ctx) {
592 return create(Or, LHS, RHS, Ctx);
593 }
594
595 static const MCBinaryExpr *createShl(const MCExpr *LHS, const MCExpr *RHS,
596 MCContext &Ctx) {
597 return create(Shl, LHS, RHS, Ctx);
598 }
599
600 static const MCBinaryExpr *createAShr(const MCExpr *LHS, const MCExpr *RHS,
601 MCContext &Ctx) {
602 return create(AShr, LHS, RHS, Ctx);
603 }
604
605 static const MCBinaryExpr *createLShr(const MCExpr *LHS, const MCExpr *RHS,
606 MCContext &Ctx) {
607 return create(LShr, LHS, RHS, Ctx);
608 }
609
610 static const MCBinaryExpr *createSub(const MCExpr *LHS, const MCExpr *RHS,
611 MCContext &Ctx) {
612 return create(Sub, LHS, RHS, Ctx);
613 }
614
615 static const MCBinaryExpr *createXor(const MCExpr *LHS, const MCExpr *RHS,
616 MCContext &Ctx) {
617 return create(Xor, LHS, RHS, Ctx);
618 }
619
620 /// @}
621 /// \name Accessors
622 /// @{
623
624 /// Get the kind of this binary expression.
625 Opcode getOpcode() const { return (Opcode)getSubclassData(); }
626
627 /// Get the left-hand side expression of the binary operator.
628 const MCExpr *getLHS() const { return LHS; }
629
630 /// Get the right-hand side expression of the binary operator.
631 const MCExpr *getRHS() const { return RHS; }
632
633 /// @}
634
635 static bool classof(const MCExpr *E) {
636 return E->getKind() == MCExpr::Binary;
637 }
638};
639
640/// This is an extension point for target-specific MCExpr subclasses to
641/// implement.
642///
643/// NOTE: All subclasses are required to have trivial destructors because
644/// MCExprs are bump pointer allocated and not destructed.
645class MCTargetExpr : public MCExpr {
646 virtual void anchor();
647
648protected:
649 MCTargetExpr() : MCExpr(Target, SMLoc()) {}
650 virtual ~MCTargetExpr() = default;
651
652public:
653 virtual void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const = 0;
654 virtual bool evaluateAsRelocatableImpl(MCValue &Res,
655 const MCAsmLayout *Layout,
656 const MCFixup *Fixup) const = 0;
657 // allow Target Expressions to be checked for equality
658 virtual bool isEqualTo(const MCExpr *x) const { return false; }
659 // This should be set when assigned expressions are not valid ".set"
660 // expressions, e.g. registers, and must be inlined.
661 virtual bool inlineAssignedExpr() const { return false; }
662 virtual void visitUsedExpr(MCStreamer& Streamer) const = 0;
663 virtual MCFragment *findAssociatedFragment() const = 0;
664
665 virtual void fixELFSymbolsInTLSFixups(MCAssembler &) const = 0;
666
667 static bool classof(const MCExpr *E) {
668 return E->getKind() == MCExpr::Target;
669 }
670};
671
672} // end namespace llvm
673
674#endif // LLVM_MC_MCEXPR_H
675

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