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"
29 typedef DenseMap<const MCSectionData*, uint64_t> SectionAddrMap;
31 /// MCExpr - Base class for the full range of assembler expressions which are
32 /// needed for parsing.
36 Binary, ///< Binary expressions.
37 Constant, ///< Constant expressions.
38 SymbolRef, ///< References to labels and assigned expressions.
39 Unary, ///< Unary expressions.
40 Target ///< Target specific expression.
46 MCExpr(const MCExpr&) LLVM_DELETED_FUNCTION;
47 void operator=(const MCExpr&) LLVM_DELETED_FUNCTION;
49 bool EvaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm,
50 const MCAsmLayout *Layout,
51 const SectionAddrMap *Addrs) const;
53 explicit MCExpr(ExprKind _Kind) : Kind(_Kind) {}
55 bool EvaluateAsRelocatableImpl(MCValue &Res, const MCAssembler *Asm,
56 const MCAsmLayout *Layout,
57 const SectionAddrMap *Addrs, bool InSet,
58 bool ForceVarExpansion) const;
64 ExprKind getKind() const { return Kind; }
67 /// @name Utility Methods
70 void print(raw_ostream &OS) const;
74 /// @name Expression Evaluation
77 /// EvaluateAsAbsolute - Try to evaluate the expression to an absolute value.
79 /// @param Res - The absolute value, if evaluation succeeds.
80 /// @param Layout - The assembler layout object to use for evaluating symbol
81 /// values. If not given, then only non-symbolic expressions will be
83 /// @result - True on success.
84 bool EvaluateAsAbsolute(int64_t &Res, const MCAsmLayout &Layout,
85 const SectionAddrMap &Addrs) const;
86 bool EvaluateAsAbsolute(int64_t &Res) const;
87 bool EvaluateAsAbsolute(int64_t &Res, const MCAssembler &Asm) const;
88 bool EvaluateAsAbsolute(int64_t &Res, const MCAsmLayout &Layout) const;
90 /// EvaluateAsRelocatable - Try to evaluate the expression to a relocatable
91 /// value, i.e. an expression of the fixed form (a - b + constant).
93 /// @param Res - The relocatable value, if evaluation succeeds.
94 /// @param Layout - The assembler layout object to use for evaluating values.
95 /// @result - True on success.
96 bool EvaluateAsRelocatable(MCValue &Res, const MCAsmLayout *Layout) const;
98 /// \brief Try to evaluate the expression to the form (a - b + constant) where
99 /// neither a nor b are variables.
101 /// This is a more aggressive variant of EvaluateAsRelocatable. The intended
102 /// use is for when relocations are not available, like the symbol value in
103 /// the symbol table.
104 bool EvaluateAsValue(MCValue &Res, const MCAsmLayout *Layout) const;
106 /// FindAssociatedSection - Find the "associated section" for this expression,
107 /// which is currently defined as the absolute section for constants, or
108 /// otherwise the section associated with the first defined symbol in the
110 const MCSection *FindAssociatedSection() const;
115 inline raw_ostream &operator<<(raw_ostream &OS, const MCExpr &E) {
120 //// MCConstantExpr - Represent a constant integer expression.
121 class MCConstantExpr : public MCExpr {
124 explicit MCConstantExpr(int64_t _Value)
125 : MCExpr(MCExpr::Constant), Value(_Value) {}
128 /// @name Construction
131 static const MCConstantExpr *Create(int64_t Value, MCContext &Ctx);
137 int64_t getValue() const { return Value; }
141 static bool classof(const MCExpr *E) {
142 return E->getKind() == MCExpr::Constant;
146 /// MCSymbolRefExpr - Represent a reference to a symbol from inside an
149 /// A symbol reference in an expression may be a use of a label, a use of an
150 /// assembler variable (defined constant), or constitute an implicit definition
151 /// of the symbol as external.
152 class MCSymbolRefExpr : public MCExpr {
171 VK_TLVP, // Mach-O thread local variable relocations
179 VK_WEAKREF, // The link between the symbols in .weakref foo, bar
185 VK_ARM_TLSLDO, // symbol(tlsldo)
186 VK_ARM_TLSCALL, // symbol(tlscall)
187 VK_ARM_TLSDESC, // symbol(tlsdesc)
190 VK_PPC_LO, // symbol@l
191 VK_PPC_HI, // symbol@h
192 VK_PPC_HA, // symbol@ha
193 VK_PPC_HIGHER, // symbol@higher
194 VK_PPC_HIGHERA, // symbol@highera
195 VK_PPC_HIGHEST, // symbol@highest
196 VK_PPC_HIGHESTA, // symbol@highesta
197 VK_PPC_GOT_LO, // symbol@got@l
198 VK_PPC_GOT_HI, // symbol@got@h
199 VK_PPC_GOT_HA, // symbol@got@ha
200 VK_PPC_TOCBASE, // symbol@tocbase
201 VK_PPC_TOC, // symbol@toc
202 VK_PPC_TOC_LO, // symbol@toc@l
203 VK_PPC_TOC_HI, // symbol@toc@h
204 VK_PPC_TOC_HA, // symbol@toc@ha
205 VK_PPC_DTPMOD, // symbol@dtpmod
206 VK_PPC_TPREL, // symbol@tprel
207 VK_PPC_TPREL_LO, // symbol@tprel@l
208 VK_PPC_TPREL_HI, // symbol@tprel@h
209 VK_PPC_TPREL_HA, // symbol@tprel@ha
210 VK_PPC_TPREL_HIGHER, // symbol@tprel@higher
211 VK_PPC_TPREL_HIGHERA, // symbol@tprel@highera
212 VK_PPC_TPREL_HIGHEST, // symbol@tprel@highest
213 VK_PPC_TPREL_HIGHESTA, // symbol@tprel@highesta
214 VK_PPC_DTPREL, // symbol@dtprel
215 VK_PPC_DTPREL_LO, // symbol@dtprel@l
216 VK_PPC_DTPREL_HI, // symbol@dtprel@h
217 VK_PPC_DTPREL_HA, // symbol@dtprel@ha
218 VK_PPC_DTPREL_HIGHER, // symbol@dtprel@higher
219 VK_PPC_DTPREL_HIGHERA, // symbol@dtprel@highera
220 VK_PPC_DTPREL_HIGHEST, // symbol@dtprel@highest
221 VK_PPC_DTPREL_HIGHESTA,// symbol@dtprel@highesta
222 VK_PPC_GOT_TPREL, // symbol@got@tprel
223 VK_PPC_GOT_TPREL_LO, // symbol@got@tprel@l
224 VK_PPC_GOT_TPREL_HI, // symbol@got@tprel@h
225 VK_PPC_GOT_TPREL_HA, // symbol@got@tprel@ha
226 VK_PPC_GOT_DTPREL, // symbol@got@dtprel
227 VK_PPC_GOT_DTPREL_LO, // symbol@got@dtprel@l
228 VK_PPC_GOT_DTPREL_HI, // symbol@got@dtprel@h
229 VK_PPC_GOT_DTPREL_HA, // symbol@got@dtprel@ha
230 VK_PPC_TLS, // symbol@tls
231 VK_PPC_GOT_TLSGD, // symbol@got@tlsgd
232 VK_PPC_GOT_TLSGD_LO, // symbol@got@tlsgd@l
233 VK_PPC_GOT_TLSGD_HI, // symbol@got@tlsgd@h
234 VK_PPC_GOT_TLSGD_HA, // symbol@got@tlsgd@ha
235 VK_PPC_TLSGD, // symbol@tlsgd
236 VK_PPC_GOT_TLSLD, // symbol@got@tlsld
237 VK_PPC_GOT_TLSLD_LO, // symbol@got@tlsld@l
238 VK_PPC_GOT_TLSLD_HI, // symbol@got@tlsld@h
239 VK_PPC_GOT_TLSLD_HA, // symbol@got@tlsld@ha
240 VK_PPC_TLSLD, // symbol@tlsld
241 VK_PPC_LOCAL, // symbol@local
270 VK_COFF_IMGREL32 // symbol@imgrel (image-relative)
274 /// The symbol being referenced.
275 const MCSymbol *Symbol;
277 /// The symbol reference modifier.
278 const VariantKind Kind;
280 /// MCAsmInfo that is used to print symbol variants correctly.
281 const MCAsmInfo *MAI;
283 explicit MCSymbolRefExpr(const MCSymbol *_Symbol, VariantKind _Kind,
284 const MCAsmInfo *_MAI)
285 : MCExpr(MCExpr::SymbolRef), Symbol(_Symbol), Kind(_Kind), MAI(_MAI) {
291 /// @name Construction
294 static const MCSymbolRefExpr *Create(const MCSymbol *Symbol, MCContext &Ctx) {
295 return MCSymbolRefExpr::Create(Symbol, VK_None, Ctx);
298 static const MCSymbolRefExpr *Create(const MCSymbol *Symbol, VariantKind Kind,
300 static const MCSymbolRefExpr *Create(StringRef Name, VariantKind Kind,
307 const MCSymbol &getSymbol() const { return *Symbol; }
308 const MCAsmInfo &getMCAsmInfo() const { return *MAI; }
310 VariantKind getKind() const { return Kind; }
313 /// @name Static Utility Functions
316 static StringRef getVariantKindName(VariantKind Kind);
318 static VariantKind getVariantKindForName(StringRef Name);
322 static bool classof(const MCExpr *E) {
323 return E->getKind() == MCExpr::SymbolRef;
327 /// MCUnaryExpr - Unary assembler expressions.
328 class MCUnaryExpr : public MCExpr {
331 LNot, ///< Logical negation.
332 Minus, ///< Unary minus.
333 Not, ///< Bitwise negation.
334 Plus ///< Unary plus.
341 MCUnaryExpr(Opcode _Op, const MCExpr *_Expr)
342 : MCExpr(MCExpr::Unary), Op(_Op), Expr(_Expr) {}
345 /// @name Construction
348 static const MCUnaryExpr *Create(Opcode Op, const MCExpr *Expr,
350 static const MCUnaryExpr *CreateLNot(const MCExpr *Expr, MCContext &Ctx) {
351 return Create(LNot, Expr, Ctx);
353 static const MCUnaryExpr *CreateMinus(const MCExpr *Expr, MCContext &Ctx) {
354 return Create(Minus, Expr, Ctx);
356 static const MCUnaryExpr *CreateNot(const MCExpr *Expr, MCContext &Ctx) {
357 return Create(Not, Expr, Ctx);
359 static const MCUnaryExpr *CreatePlus(const MCExpr *Expr, MCContext &Ctx) {
360 return Create(Plus, Expr, Ctx);
367 /// getOpcode - Get the kind of this unary expression.
368 Opcode getOpcode() const { return Op; }
370 /// getSubExpr - Get the child of this unary expression.
371 const MCExpr *getSubExpr() const { return Expr; }
375 static bool classof(const MCExpr *E) {
376 return E->getKind() == MCExpr::Unary;
380 /// MCBinaryExpr - Binary assembler expressions.
381 class MCBinaryExpr : public MCExpr {
385 And, ///< Bitwise and.
386 Div, ///< Signed division.
387 EQ, ///< Equality comparison.
388 GT, ///< Signed greater than comparison (result is either 0 or some
389 ///< target-specific non-zero value)
390 GTE, ///< Signed greater than or equal comparison (result is either 0 or
391 ///< some target-specific non-zero value).
392 LAnd, ///< Logical and.
393 LOr, ///< Logical or.
394 LT, ///< Signed less than comparison (result is either 0 or
395 ///< some target-specific non-zero value).
396 LTE, ///< Signed less than or equal comparison (result is either 0 or
397 ///< some target-specific non-zero value).
398 Mod, ///< Signed remainder.
399 Mul, ///< Multiplication.
400 NE, ///< Inequality comparison.
402 Shl, ///< Shift left.
403 Shr, ///< Shift right (arithmetic or logical, depending on target)
404 Sub, ///< Subtraction.
405 Xor ///< Bitwise exclusive or.
410 const MCExpr *LHS, *RHS;
412 MCBinaryExpr(Opcode _Op, const MCExpr *_LHS, const MCExpr *_RHS)
413 : MCExpr(MCExpr::Binary), Op(_Op), LHS(_LHS), RHS(_RHS) {}
416 /// @name Construction
419 static const MCBinaryExpr *Create(Opcode Op, const MCExpr *LHS,
420 const MCExpr *RHS, MCContext &Ctx);
421 static const MCBinaryExpr *CreateAdd(const MCExpr *LHS, const MCExpr *RHS,
423 return Create(Add, LHS, RHS, Ctx);
425 static const MCBinaryExpr *CreateAnd(const MCExpr *LHS, const MCExpr *RHS,
427 return Create(And, LHS, RHS, Ctx);
429 static const MCBinaryExpr *CreateDiv(const MCExpr *LHS, const MCExpr *RHS,
431 return Create(Div, LHS, RHS, Ctx);
433 static const MCBinaryExpr *CreateEQ(const MCExpr *LHS, const MCExpr *RHS,
435 return Create(EQ, LHS, RHS, Ctx);
437 static const MCBinaryExpr *CreateGT(const MCExpr *LHS, const MCExpr *RHS,
439 return Create(GT, LHS, RHS, Ctx);
441 static const MCBinaryExpr *CreateGTE(const MCExpr *LHS, const MCExpr *RHS,
443 return Create(GTE, LHS, RHS, Ctx);
445 static const MCBinaryExpr *CreateLAnd(const MCExpr *LHS, const MCExpr *RHS,
447 return Create(LAnd, LHS, RHS, Ctx);
449 static const MCBinaryExpr *CreateLOr(const MCExpr *LHS, const MCExpr *RHS,
451 return Create(LOr, LHS, RHS, Ctx);
453 static const MCBinaryExpr *CreateLT(const MCExpr *LHS, const MCExpr *RHS,
455 return Create(LT, LHS, RHS, Ctx);
457 static const MCBinaryExpr *CreateLTE(const MCExpr *LHS, const MCExpr *RHS,
459 return Create(LTE, LHS, RHS, Ctx);
461 static const MCBinaryExpr *CreateMod(const MCExpr *LHS, const MCExpr *RHS,
463 return Create(Mod, LHS, RHS, Ctx);
465 static const MCBinaryExpr *CreateMul(const MCExpr *LHS, const MCExpr *RHS,
467 return Create(Mul, LHS, RHS, Ctx);
469 static const MCBinaryExpr *CreateNE(const MCExpr *LHS, const MCExpr *RHS,
471 return Create(NE, LHS, RHS, Ctx);
473 static const MCBinaryExpr *CreateOr(const MCExpr *LHS, const MCExpr *RHS,
475 return Create(Or, LHS, RHS, Ctx);
477 static const MCBinaryExpr *CreateShl(const MCExpr *LHS, const MCExpr *RHS,
479 return Create(Shl, LHS, RHS, Ctx);
481 static const MCBinaryExpr *CreateShr(const MCExpr *LHS, const MCExpr *RHS,
483 return Create(Shr, LHS, RHS, Ctx);
485 static const MCBinaryExpr *CreateSub(const MCExpr *LHS, const MCExpr *RHS,
487 return Create(Sub, LHS, RHS, Ctx);
489 static const MCBinaryExpr *CreateXor(const MCExpr *LHS, const MCExpr *RHS,
491 return Create(Xor, LHS, RHS, Ctx);
498 /// getOpcode - Get the kind of this binary expression.
499 Opcode getOpcode() const { return Op; }
501 /// getLHS - Get the left-hand side expression of the binary operator.
502 const MCExpr *getLHS() const { return LHS; }
504 /// getRHS - Get the right-hand side expression of the binary operator.
505 const MCExpr *getRHS() const { return RHS; }
509 static bool classof(const MCExpr *E) {
510 return E->getKind() == MCExpr::Binary;
514 /// MCTargetExpr - This is an extension point for target-specific MCExpr
515 /// subclasses to implement.
517 /// NOTE: All subclasses are required to have trivial destructors because
518 /// MCExprs are bump pointer allocated and not destructed.
519 class MCTargetExpr : public MCExpr {
520 virtual void anchor();
522 MCTargetExpr() : MCExpr(Target) {}
523 virtual ~MCTargetExpr() {}
526 virtual void PrintImpl(raw_ostream &OS) const = 0;
527 virtual bool EvaluateAsRelocatableImpl(MCValue &Res,
528 const MCAsmLayout *Layout) const = 0;
529 virtual void visitUsedExpr(MCStreamer& Streamer) const = 0;
530 virtual const MCSection *FindAssociatedSection() const = 0;
532 virtual void fixELFSymbolsInTLSFixups(MCAssembler &) const = 0;
534 static bool classof(const MCExpr *E) {
535 return E->getKind() == MCExpr::Target;
539 } // end namespace llvm