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"
27 typedef DenseMap<const MCSectionData*, uint64_t> SectionAddrMap;
29 /// MCExpr - Base class for the full range of assembler expressions which are
30 /// needed for parsing.
34 Binary, ///< Binary expressions.
35 Constant, ///< Constant expressions.
36 SymbolRef, ///< References to labels and assigned expressions.
37 Unary, ///< Unary expressions.
38 Target ///< Target specific expression.
44 MCExpr(const MCExpr&) LLVM_DELETED_FUNCTION;
45 void operator=(const MCExpr&) LLVM_DELETED_FUNCTION;
47 bool EvaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm,
48 const MCAsmLayout *Layout,
49 const SectionAddrMap *Addrs) const;
51 explicit MCExpr(ExprKind _Kind) : Kind(_Kind) {}
53 bool EvaluateAsRelocatableImpl(MCValue &Res, const MCAssembler *Asm,
54 const MCAsmLayout *Layout,
55 const SectionAddrMap *Addrs,
61 ExprKind getKind() const { return Kind; }
64 /// @name Utility Methods
67 void print(raw_ostream &OS) const;
71 /// @name Expression Evaluation
74 /// EvaluateAsAbsolute - Try to evaluate the expression to an absolute value.
76 /// @param Res - The absolute value, if evaluation succeeds.
77 /// @param Layout - The assembler layout object to use for evaluating symbol
78 /// values. If not given, then only non-symbolic expressions will be
80 /// @result - True on success.
81 bool EvaluateAsAbsolute(int64_t &Res, const MCAsmLayout &Layout,
82 const SectionAddrMap &Addrs) const;
83 bool EvaluateAsAbsolute(int64_t &Res) const;
84 bool EvaluateAsAbsolute(int64_t &Res, const MCAssembler &Asm) const;
85 bool EvaluateAsAbsolute(int64_t &Res, const MCAsmLayout &Layout) const;
87 /// EvaluateAsRelocatable - Try to evaluate the expression to a relocatable
88 /// value, i.e. an expression of the fixed form (a - b + constant).
90 /// @param Res - The relocatable value, if evaluation succeeds.
91 /// @param Layout - The assembler layout object to use for evaluating values.
92 /// @result - True on success.
93 bool EvaluateAsRelocatable(MCValue &Res, const MCAsmLayout &Layout) const;
95 /// FindAssociatedSection - Find the "associated section" for this expression,
96 /// which is currently defined as the absolute section for constants, or
97 /// otherwise the section associated with the first defined symbol in the
99 const MCSection *FindAssociatedSection() const;
104 inline raw_ostream &operator<<(raw_ostream &OS, const MCExpr &E) {
109 //// MCConstantExpr - Represent a constant integer expression.
110 class MCConstantExpr : public MCExpr {
113 explicit MCConstantExpr(int64_t _Value)
114 : MCExpr(MCExpr::Constant), Value(_Value) {}
117 /// @name Construction
120 static const MCConstantExpr *Create(int64_t Value, MCContext &Ctx);
126 int64_t getValue() const { return Value; }
130 static bool classof(const MCExpr *E) {
131 return E->getKind() == MCExpr::Constant;
135 /// MCSymbolRefExpr - Represent a reference to a symbol from inside an
138 /// A symbol reference in an expression may be a use of a label, a use of an
139 /// assembler variable (defined constant), or constitute an implicit definition
140 /// of the symbol as external.
141 class MCSymbolRefExpr : public MCExpr {
160 VK_TLVP, // Mach-O thread local variable relocation
162 // FIXME: We'd really like to use the generic Kinds listed above for these.
164 VK_ARM_PLT, // ARM-style PLT references. i.e., (PLT) instead of @PLT
165 VK_ARM_TLSGD, // ditto for TLSGD, GOT, GOTOFF, TPOFF and GOTTPOFF
174 VK_PPC_LO, // symbol@l
175 VK_PPC_HI, // symbol@h
176 VK_PPC_HA, // symbol@ha
177 VK_PPC_HIGHER, // symbol@higher
178 VK_PPC_HIGHERA, // symbol@highera
179 VK_PPC_HIGHEST, // symbol@highest
180 VK_PPC_HIGHESTA, // symbol@highesta
181 VK_PPC_TOCBASE, // symbol@tocbase
182 VK_PPC_TOC, // symbol@toc
183 VK_PPC_TOC_LO, // symbol@toc@l
184 VK_PPC_TOC_HI, // symbol@toc@h
185 VK_PPC_TOC_HA, // symbol@toc@ha
186 VK_PPC_TPREL_LO, // symbol@tprel@l
187 VK_PPC_TPREL_HA, // symbol@tprel@ha
188 VK_PPC_DTPREL_LO, // symbol@dtprel@l
189 VK_PPC_DTPREL_HA, // symbol@dtprel@ha
190 VK_PPC_GOT_TPREL_LO, // symbol@got@tprel@l
191 VK_PPC_GOT_TPREL_HA, // symbol@got@tprel@ha
192 VK_PPC_TLS, // symbol@tls
193 VK_PPC_GOT_TLSGD_LO, // symbol@got@tlsgd@l
194 VK_PPC_GOT_TLSGD_HA, // symbol@got@tlsgd@ha
195 VK_PPC_TLSGD, // symbol@tlsgd
196 VK_PPC_GOT_TLSLD_LO, // symbol@got@tlsld@l
197 VK_PPC_GOT_TLSLD_HA, // symbol@got@tlsld@ha
198 VK_PPC_TLSLD, // symbol@tlsld
225 VK_COFF_IMGREL32 // symbol@imgrel (image-relative)
229 /// The symbol being referenced.
230 const MCSymbol *Symbol;
232 /// The symbol reference modifier.
233 const VariantKind Kind;
235 explicit MCSymbolRefExpr(const MCSymbol *_Symbol, VariantKind _Kind)
236 : MCExpr(MCExpr::SymbolRef), Symbol(_Symbol), Kind(_Kind) {
241 /// @name Construction
244 static const MCSymbolRefExpr *Create(const MCSymbol *Symbol, MCContext &Ctx) {
245 return MCSymbolRefExpr::Create(Symbol, VK_None, Ctx);
248 static const MCSymbolRefExpr *Create(const MCSymbol *Symbol, VariantKind Kind,
250 static const MCSymbolRefExpr *Create(StringRef Name, VariantKind Kind,
257 const MCSymbol &getSymbol() const { return *Symbol; }
259 VariantKind getKind() const { return Kind; }
262 /// @name Static Utility Functions
265 static StringRef getVariantKindName(VariantKind Kind);
267 static VariantKind getVariantKindForName(StringRef Name);
271 static bool classof(const MCExpr *E) {
272 return E->getKind() == MCExpr::SymbolRef;
276 /// MCUnaryExpr - Unary assembler expressions.
277 class MCUnaryExpr : public MCExpr {
280 LNot, ///< Logical negation.
281 Minus, ///< Unary minus.
282 Not, ///< Bitwise negation.
283 Plus ///< Unary plus.
290 MCUnaryExpr(Opcode _Op, const MCExpr *_Expr)
291 : MCExpr(MCExpr::Unary), Op(_Op), Expr(_Expr) {}
294 /// @name Construction
297 static const MCUnaryExpr *Create(Opcode Op, const MCExpr *Expr,
299 static const MCUnaryExpr *CreateLNot(const MCExpr *Expr, MCContext &Ctx) {
300 return Create(LNot, Expr, Ctx);
302 static const MCUnaryExpr *CreateMinus(const MCExpr *Expr, MCContext &Ctx) {
303 return Create(Minus, Expr, Ctx);
305 static const MCUnaryExpr *CreateNot(const MCExpr *Expr, MCContext &Ctx) {
306 return Create(Not, Expr, Ctx);
308 static const MCUnaryExpr *CreatePlus(const MCExpr *Expr, MCContext &Ctx) {
309 return Create(Plus, Expr, Ctx);
316 /// getOpcode - Get the kind of this unary expression.
317 Opcode getOpcode() const { return Op; }
319 /// getSubExpr - Get the child of this unary expression.
320 const MCExpr *getSubExpr() const { return Expr; }
324 static bool classof(const MCExpr *E) {
325 return E->getKind() == MCExpr::Unary;
329 /// MCBinaryExpr - Binary assembler expressions.
330 class MCBinaryExpr : public MCExpr {
334 And, ///< Bitwise and.
335 Div, ///< Signed division.
336 EQ, ///< Equality comparison.
337 GT, ///< Signed greater than comparison (result is either 0 or some
338 ///< target-specific non-zero value)
339 GTE, ///< Signed greater than or equal comparison (result is either 0 or
340 ///< some target-specific non-zero value).
341 LAnd, ///< Logical and.
342 LOr, ///< Logical or.
343 LT, ///< Signed less than comparison (result is either 0 or
344 ///< some target-specific non-zero value).
345 LTE, ///< Signed less than or equal comparison (result is either 0 or
346 ///< some target-specific non-zero value).
347 Mod, ///< Signed remainder.
348 Mul, ///< Multiplication.
349 NE, ///< Inequality comparison.
351 Shl, ///< Shift left.
352 Shr, ///< Shift right (arithmetic or logical, depending on target)
353 Sub, ///< Subtraction.
354 Xor ///< Bitwise exclusive or.
359 const MCExpr *LHS, *RHS;
361 MCBinaryExpr(Opcode _Op, const MCExpr *_LHS, const MCExpr *_RHS)
362 : MCExpr(MCExpr::Binary), Op(_Op), LHS(_LHS), RHS(_RHS) {}
365 /// @name Construction
368 static const MCBinaryExpr *Create(Opcode Op, const MCExpr *LHS,
369 const MCExpr *RHS, MCContext &Ctx);
370 static const MCBinaryExpr *CreateAdd(const MCExpr *LHS, const MCExpr *RHS,
372 return Create(Add, LHS, RHS, Ctx);
374 static const MCBinaryExpr *CreateAnd(const MCExpr *LHS, const MCExpr *RHS,
376 return Create(And, LHS, RHS, Ctx);
378 static const MCBinaryExpr *CreateDiv(const MCExpr *LHS, const MCExpr *RHS,
380 return Create(Div, LHS, RHS, Ctx);
382 static const MCBinaryExpr *CreateEQ(const MCExpr *LHS, const MCExpr *RHS,
384 return Create(EQ, LHS, RHS, Ctx);
386 static const MCBinaryExpr *CreateGT(const MCExpr *LHS, const MCExpr *RHS,
388 return Create(GT, LHS, RHS, Ctx);
390 static const MCBinaryExpr *CreateGTE(const MCExpr *LHS, const MCExpr *RHS,
392 return Create(GTE, LHS, RHS, Ctx);
394 static const MCBinaryExpr *CreateLAnd(const MCExpr *LHS, const MCExpr *RHS,
396 return Create(LAnd, LHS, RHS, Ctx);
398 static const MCBinaryExpr *CreateLOr(const MCExpr *LHS, const MCExpr *RHS,
400 return Create(LOr, LHS, RHS, Ctx);
402 static const MCBinaryExpr *CreateLT(const MCExpr *LHS, const MCExpr *RHS,
404 return Create(LT, LHS, RHS, Ctx);
406 static const MCBinaryExpr *CreateLTE(const MCExpr *LHS, const MCExpr *RHS,
408 return Create(LTE, LHS, RHS, Ctx);
410 static const MCBinaryExpr *CreateMod(const MCExpr *LHS, const MCExpr *RHS,
412 return Create(Mod, LHS, RHS, Ctx);
414 static const MCBinaryExpr *CreateMul(const MCExpr *LHS, const MCExpr *RHS,
416 return Create(Mul, LHS, RHS, Ctx);
418 static const MCBinaryExpr *CreateNE(const MCExpr *LHS, const MCExpr *RHS,
420 return Create(NE, LHS, RHS, Ctx);
422 static const MCBinaryExpr *CreateOr(const MCExpr *LHS, const MCExpr *RHS,
424 return Create(Or, LHS, RHS, Ctx);
426 static const MCBinaryExpr *CreateShl(const MCExpr *LHS, const MCExpr *RHS,
428 return Create(Shl, LHS, RHS, Ctx);
430 static const MCBinaryExpr *CreateShr(const MCExpr *LHS, const MCExpr *RHS,
432 return Create(Shr, LHS, RHS, Ctx);
434 static const MCBinaryExpr *CreateSub(const MCExpr *LHS, const MCExpr *RHS,
436 return Create(Sub, LHS, RHS, Ctx);
438 static const MCBinaryExpr *CreateXor(const MCExpr *LHS, const MCExpr *RHS,
440 return Create(Xor, LHS, RHS, Ctx);
447 /// getOpcode - Get the kind of this binary expression.
448 Opcode getOpcode() const { return Op; }
450 /// getLHS - Get the left-hand side expression of the binary operator.
451 const MCExpr *getLHS() const { return LHS; }
453 /// getRHS - Get the right-hand side expression of the binary operator.
454 const MCExpr *getRHS() const { return RHS; }
458 static bool classof(const MCExpr *E) {
459 return E->getKind() == MCExpr::Binary;
463 /// MCTargetExpr - This is an extension point for target-specific MCExpr
464 /// subclasses to implement.
466 /// NOTE: All subclasses are required to have trivial destructors because
467 /// MCExprs are bump pointer allocated and not destructed.
468 class MCTargetExpr : public MCExpr {
469 virtual void anchor();
471 MCTargetExpr() : MCExpr(Target) {}
472 virtual ~MCTargetExpr() {}
475 virtual void PrintImpl(raw_ostream &OS) const = 0;
476 virtual bool EvaluateAsRelocatableImpl(MCValue &Res,
477 const MCAsmLayout *Layout) const = 0;
478 virtual void AddValueSymbols(MCAssembler *) const = 0;
479 virtual const MCSection *FindAssociatedSection() const = 0;
481 virtual void fixELFSymbolsInTLSFixups(MCAssembler &) const = 0;
483 static bool classof(const MCExpr *E) {
484 return E->getKind() == MCExpr::Target;
488 } // end namespace llvm