1 //===- MCExpr.h - Assembly Level Expressions --------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_MC_MCEXPR_H
11 #define LLVM_MC_MCEXPR_H
13 #include "llvm/ADT/DenseMap.h"
14 #include "llvm/Support/Casting.h"
15 #include "llvm/Support/DataTypes.h"
30 typedef DenseMap<const MCSectionData*, uint64_t> SectionAddrMap;
32 /// MCExpr - Base class for the full range of assembler expressions which are
33 /// needed for parsing.
37 Binary, ///< Binary expressions.
38 Constant, ///< Constant expressions.
39 SymbolRef, ///< References to labels and assigned expressions.
40 Unary, ///< Unary expressions.
41 Target ///< Target specific expression.
47 MCExpr(const MCExpr&) = delete;
48 void operator=(const MCExpr&) = delete;
50 bool EvaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm,
51 const MCAsmLayout *Layout,
52 const SectionAddrMap *Addrs) const;
54 bool evaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm,
55 const MCAsmLayout *Layout,
56 const SectionAddrMap *Addrs, bool InSet) const;
59 explicit MCExpr(ExprKind Kind) : Kind(Kind) {}
61 bool EvaluateAsRelocatableImpl(MCValue &Res, const MCAssembler *Asm,
62 const MCAsmLayout *Layout,
64 const SectionAddrMap *Addrs, bool InSet) const;
70 ExprKind getKind() const { return Kind; }
73 /// @name Utility Methods
76 void print(raw_ostream &OS) const;
80 /// @name Expression Evaluation
83 /// EvaluateAsAbsolute - Try to evaluate the expression to an absolute value.
85 /// @param Res - The absolute value, if evaluation succeeds.
86 /// @param Layout - The assembler layout object to use for evaluating symbol
87 /// values. If not given, then only non-symbolic expressions will be
89 /// @result - True on success.
90 bool EvaluateAsAbsolute(int64_t &Res, const MCAsmLayout &Layout,
91 const SectionAddrMap &Addrs) const;
92 bool EvaluateAsAbsolute(int64_t &Res) const;
93 bool EvaluateAsAbsolute(int64_t &Res, const MCAssembler &Asm) const;
94 bool EvaluateAsAbsolute(int64_t &Res, const MCAsmLayout &Layout) const;
96 bool evaluateKnownAbsolute(int64_t &Res, const MCAsmLayout &Layout) const;
98 /// EvaluateAsRelocatable - Try to evaluate the expression to a relocatable
99 /// value, i.e. an expression of the fixed form (a - b + constant).
101 /// @param Res - The relocatable value, if evaluation succeeds.
102 /// @param Layout - The assembler layout object to use for evaluating values.
103 /// @param Fixup - The Fixup object if available.
104 /// @result - True on success.
105 bool EvaluateAsRelocatable(MCValue &Res, const MCAsmLayout *Layout,
106 const MCFixup *Fixup) const;
108 /// \brief Try to evaluate the expression to the form (a - b + constant) where
109 /// neither a nor b are variables.
111 /// This is a more aggressive variant of EvaluateAsRelocatable. The intended
112 /// use is for when relocations are not available, like the .size directive.
113 bool evaluateAsValue(MCValue &Res, const MCAsmLayout &Layout) const;
115 /// FindAssociatedSection - Find the "associated section" for this expression,
116 /// which is currently defined as the absolute section for constants, or
117 /// otherwise the section associated with the first defined symbol in the
119 const MCSection *FindAssociatedSection() const;
124 inline raw_ostream &operator<<(raw_ostream &OS, const MCExpr &E) {
129 //// MCConstantExpr - Represent a constant integer expression.
130 class MCConstantExpr : public MCExpr {
133 explicit MCConstantExpr(int64_t Value)
134 : MCExpr(MCExpr::Constant), Value(Value) {}
137 /// @name Construction
140 static const MCConstantExpr *Create(int64_t Value, MCContext &Ctx);
146 int64_t getValue() const { return Value; }
150 static bool classof(const MCExpr *E) {
151 return E->getKind() == MCExpr::Constant;
155 /// MCSymbolRefExpr - Represent a reference to a symbol from inside an
158 /// A symbol reference in an expression may be a use of a label, a use of an
159 /// assembler variable (defined constant), or constitute an implicit definition
160 /// of the symbol as external.
161 class MCSymbolRefExpr : public MCExpr {
180 VK_TLVP, // Mach-O thread local variable relocations
188 VK_SIZE, // symbol@SIZE
189 VK_WEAKREF, // The link between the symbols in .weakref foo, bar
195 VK_ARM_SBREL, // symbol(sbrel)
196 VK_ARM_TLSLDO, // symbol(tlsldo)
197 VK_ARM_TLSCALL, // symbol(tlscall)
198 VK_ARM_TLSDESC, // symbol(tlsdesc)
201 VK_PPC_LO, // symbol@l
202 VK_PPC_HI, // symbol@h
203 VK_PPC_HA, // symbol@ha
204 VK_PPC_HIGHER, // symbol@higher
205 VK_PPC_HIGHERA, // symbol@highera
206 VK_PPC_HIGHEST, // symbol@highest
207 VK_PPC_HIGHESTA, // symbol@highesta
208 VK_PPC_GOT_LO, // symbol@got@l
209 VK_PPC_GOT_HI, // symbol@got@h
210 VK_PPC_GOT_HA, // symbol@got@ha
211 VK_PPC_TOCBASE, // symbol@tocbase
212 VK_PPC_TOC, // symbol@toc
213 VK_PPC_TOC_LO, // symbol@toc@l
214 VK_PPC_TOC_HI, // symbol@toc@h
215 VK_PPC_TOC_HA, // symbol@toc@ha
216 VK_PPC_DTPMOD, // symbol@dtpmod
217 VK_PPC_TPREL, // symbol@tprel
218 VK_PPC_TPREL_LO, // symbol@tprel@l
219 VK_PPC_TPREL_HI, // symbol@tprel@h
220 VK_PPC_TPREL_HA, // symbol@tprel@ha
221 VK_PPC_TPREL_HIGHER, // symbol@tprel@higher
222 VK_PPC_TPREL_HIGHERA, // symbol@tprel@highera
223 VK_PPC_TPREL_HIGHEST, // symbol@tprel@highest
224 VK_PPC_TPREL_HIGHESTA, // symbol@tprel@highesta
225 VK_PPC_DTPREL, // symbol@dtprel
226 VK_PPC_DTPREL_LO, // symbol@dtprel@l
227 VK_PPC_DTPREL_HI, // symbol@dtprel@h
228 VK_PPC_DTPREL_HA, // symbol@dtprel@ha
229 VK_PPC_DTPREL_HIGHER, // symbol@dtprel@higher
230 VK_PPC_DTPREL_HIGHERA, // symbol@dtprel@highera
231 VK_PPC_DTPREL_HIGHEST, // symbol@dtprel@highest
232 VK_PPC_DTPREL_HIGHESTA,// symbol@dtprel@highesta
233 VK_PPC_GOT_TPREL, // symbol@got@tprel
234 VK_PPC_GOT_TPREL_LO, // symbol@got@tprel@l
235 VK_PPC_GOT_TPREL_HI, // symbol@got@tprel@h
236 VK_PPC_GOT_TPREL_HA, // symbol@got@tprel@ha
237 VK_PPC_GOT_DTPREL, // symbol@got@dtprel
238 VK_PPC_GOT_DTPREL_LO, // symbol@got@dtprel@l
239 VK_PPC_GOT_DTPREL_HI, // symbol@got@dtprel@h
240 VK_PPC_GOT_DTPREL_HA, // symbol@got@dtprel@ha
241 VK_PPC_TLS, // symbol@tls
242 VK_PPC_GOT_TLSGD, // symbol@got@tlsgd
243 VK_PPC_GOT_TLSGD_LO, // symbol@got@tlsgd@l
244 VK_PPC_GOT_TLSGD_HI, // symbol@got@tlsgd@h
245 VK_PPC_GOT_TLSGD_HA, // symbol@got@tlsgd@ha
246 VK_PPC_TLSGD, // symbol@tlsgd
247 VK_PPC_GOT_TLSLD, // symbol@got@tlsld
248 VK_PPC_GOT_TLSLD_LO, // symbol@got@tlsld@l
249 VK_PPC_GOT_TLSLD_HI, // symbol@got@tlsld@h
250 VK_PPC_GOT_TLSLD_HA, // symbol@got@tlsld@ha
251 VK_PPC_TLSLD, // symbol@tlsld
252 VK_PPC_LOCAL, // symbol@local
281 VK_COFF_IMGREL32 // symbol@imgrel (image-relative)
285 /// The symbol reference modifier.
286 const unsigned Kind : 16;
288 /// Specifies how the variant kind should be printed.
289 const unsigned UseParensForSymbolVariant : 1;
291 // FIXME: Remove this bit.
292 const unsigned HasSubsectionsViaSymbols : 1;
294 /// The symbol being referenced.
295 const MCSymbol *Symbol;
297 explicit MCSymbolRefExpr(const MCSymbol *Symbol, VariantKind Kind,
298 const MCAsmInfo *MAI);
301 /// @name Construction
304 static const MCSymbolRefExpr *Create(const MCSymbol *Symbol, MCContext &Ctx) {
305 return MCSymbolRefExpr::Create(Symbol, VK_None, Ctx);
308 static const MCSymbolRefExpr *Create(const MCSymbol *Symbol, VariantKind Kind,
310 static const MCSymbolRefExpr *Create(StringRef Name, VariantKind Kind,
317 const MCSymbol &getSymbol() const { return *Symbol; }
319 VariantKind getKind() const { return static_cast<VariantKind>(Kind); }
321 void printVariantKind(raw_ostream &OS) const;
323 bool hasSubsectionsViaSymbols() const { return HasSubsectionsViaSymbols; }
326 /// @name Static Utility Functions
329 static StringRef getVariantKindName(VariantKind Kind);
331 static VariantKind getVariantKindForName(StringRef Name);
335 static bool classof(const MCExpr *E) {
336 return E->getKind() == MCExpr::SymbolRef;
340 /// MCUnaryExpr - Unary assembler expressions.
341 class MCUnaryExpr : public MCExpr {
344 LNot, ///< Logical negation.
345 Minus, ///< Unary minus.
346 Not, ///< Bitwise negation.
347 Plus ///< Unary plus.
354 MCUnaryExpr(Opcode Op, const MCExpr *Expr)
355 : MCExpr(MCExpr::Unary), Op(Op), Expr(Expr) {}
358 /// @name Construction
361 static const MCUnaryExpr *Create(Opcode Op, const MCExpr *Expr,
363 static const MCUnaryExpr *CreateLNot(const MCExpr *Expr, MCContext &Ctx) {
364 return Create(LNot, Expr, Ctx);
366 static const MCUnaryExpr *CreateMinus(const MCExpr *Expr, MCContext &Ctx) {
367 return Create(Minus, Expr, Ctx);
369 static const MCUnaryExpr *CreateNot(const MCExpr *Expr, MCContext &Ctx) {
370 return Create(Not, Expr, Ctx);
372 static const MCUnaryExpr *CreatePlus(const MCExpr *Expr, MCContext &Ctx) {
373 return Create(Plus, Expr, Ctx);
380 /// getOpcode - Get the kind of this unary expression.
381 Opcode getOpcode() const { return Op; }
383 /// getSubExpr - Get the child of this unary expression.
384 const MCExpr *getSubExpr() const { return Expr; }
388 static bool classof(const MCExpr *E) {
389 return E->getKind() == MCExpr::Unary;
393 /// MCBinaryExpr - Binary assembler expressions.
394 class MCBinaryExpr : public MCExpr {
398 And, ///< Bitwise and.
399 Div, ///< Signed division.
400 EQ, ///< Equality comparison.
401 GT, ///< Signed greater than comparison (result is either 0 or some
402 ///< target-specific non-zero value)
403 GTE, ///< Signed greater than or equal comparison (result is either 0 or
404 ///< some target-specific non-zero value).
405 LAnd, ///< Logical and.
406 LOr, ///< Logical or.
407 LT, ///< Signed less than comparison (result is either 0 or
408 ///< some target-specific non-zero value).
409 LTE, ///< Signed less than or equal comparison (result is either 0 or
410 ///< some target-specific non-zero value).
411 Mod, ///< Signed remainder.
412 Mul, ///< Multiplication.
413 NE, ///< Inequality comparison.
415 Shl, ///< Shift left.
416 AShr, ///< Arithmetic shift right.
417 LShr, ///< Logical shift right.
418 Sub, ///< Subtraction.
419 Xor ///< Bitwise exclusive or.
424 const MCExpr *LHS, *RHS;
426 MCBinaryExpr(Opcode Op, const MCExpr *LHS, const MCExpr *RHS)
427 : MCExpr(MCExpr::Binary), Op(Op), LHS(LHS), RHS(RHS) {}
430 /// @name Construction
433 static const MCBinaryExpr *Create(Opcode Op, const MCExpr *LHS,
434 const MCExpr *RHS, MCContext &Ctx);
435 static const MCBinaryExpr *CreateAdd(const MCExpr *LHS, const MCExpr *RHS,
437 return Create(Add, LHS, RHS, Ctx);
439 static const MCBinaryExpr *CreateAnd(const MCExpr *LHS, const MCExpr *RHS,
441 return Create(And, LHS, RHS, Ctx);
443 static const MCBinaryExpr *CreateDiv(const MCExpr *LHS, const MCExpr *RHS,
445 return Create(Div, LHS, RHS, Ctx);
447 static const MCBinaryExpr *CreateEQ(const MCExpr *LHS, const MCExpr *RHS,
449 return Create(EQ, LHS, RHS, Ctx);
451 static const MCBinaryExpr *CreateGT(const MCExpr *LHS, const MCExpr *RHS,
453 return Create(GT, LHS, RHS, Ctx);
455 static const MCBinaryExpr *CreateGTE(const MCExpr *LHS, const MCExpr *RHS,
457 return Create(GTE, LHS, RHS, Ctx);
459 static const MCBinaryExpr *CreateLAnd(const MCExpr *LHS, const MCExpr *RHS,
461 return Create(LAnd, LHS, RHS, Ctx);
463 static const MCBinaryExpr *CreateLOr(const MCExpr *LHS, const MCExpr *RHS,
465 return Create(LOr, LHS, RHS, Ctx);
467 static const MCBinaryExpr *CreateLT(const MCExpr *LHS, const MCExpr *RHS,
469 return Create(LT, LHS, RHS, Ctx);
471 static const MCBinaryExpr *CreateLTE(const MCExpr *LHS, const MCExpr *RHS,
473 return Create(LTE, LHS, RHS, Ctx);
475 static const MCBinaryExpr *CreateMod(const MCExpr *LHS, const MCExpr *RHS,
477 return Create(Mod, LHS, RHS, Ctx);
479 static const MCBinaryExpr *CreateMul(const MCExpr *LHS, const MCExpr *RHS,
481 return Create(Mul, LHS, RHS, Ctx);
483 static const MCBinaryExpr *CreateNE(const MCExpr *LHS, const MCExpr *RHS,
485 return Create(NE, LHS, RHS, Ctx);
487 static const MCBinaryExpr *CreateOr(const MCExpr *LHS, const MCExpr *RHS,
489 return Create(Or, LHS, RHS, Ctx);
491 static const MCBinaryExpr *CreateShl(const MCExpr *LHS, const MCExpr *RHS,
493 return Create(Shl, LHS, RHS, Ctx);
495 static const MCBinaryExpr *CreateAShr(const MCExpr *LHS, const MCExpr *RHS,
497 return Create(AShr, LHS, RHS, Ctx);
499 static const MCBinaryExpr *CreateLShr(const MCExpr *LHS, const MCExpr *RHS,
501 return Create(LShr, LHS, RHS, Ctx);
503 static const MCBinaryExpr *CreateSub(const MCExpr *LHS, const MCExpr *RHS,
505 return Create(Sub, LHS, RHS, Ctx);
507 static const MCBinaryExpr *CreateXor(const MCExpr *LHS, const MCExpr *RHS,
509 return Create(Xor, LHS, RHS, Ctx);
516 /// getOpcode - Get the kind of this binary expression.
517 Opcode getOpcode() const { return Op; }
519 /// getLHS - Get the left-hand side expression of the binary operator.
520 const MCExpr *getLHS() const { return LHS; }
522 /// getRHS - Get the right-hand side expression of the binary operator.
523 const MCExpr *getRHS() const { return RHS; }
527 static bool classof(const MCExpr *E) {
528 return E->getKind() == MCExpr::Binary;
532 /// MCTargetExpr - This is an extension point for target-specific MCExpr
533 /// subclasses to implement.
535 /// NOTE: All subclasses are required to have trivial destructors because
536 /// MCExprs are bump pointer allocated and not destructed.
537 class MCTargetExpr : public MCExpr {
538 virtual void anchor();
540 MCTargetExpr() : MCExpr(Target) {}
541 virtual ~MCTargetExpr() {}
544 virtual void PrintImpl(raw_ostream &OS) const = 0;
545 virtual bool EvaluateAsRelocatableImpl(MCValue &Res,
546 const MCAsmLayout *Layout,
547 const MCFixup *Fixup) const = 0;
548 virtual void visitUsedExpr(MCStreamer& Streamer) const = 0;
549 virtual const MCSection *FindAssociatedSection() const = 0;
551 virtual void fixELFSymbolsInTLSFixups(MCAssembler &) const = 0;
553 static bool classof(const MCExpr *E) {
554 return E->getKind() == MCExpr::Target;
558 } // end namespace llvm