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&); // DO NOT IMPLEMENT
45 void operator=(const MCExpr&); // DO NOT IMPLEMENT
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 MCAsmLayout *Layout,
54 const SectionAddrMap *Addrs,
60 ExprKind getKind() const { return Kind; }
63 /// @name Utility Methods
66 void print(raw_ostream &OS) const;
70 /// @name Expression Evaluation
73 /// EvaluateAsAbsolute - Try to evaluate the expression to an absolute value.
75 /// @param Res - The absolute value, if evaluation succeeds.
76 /// @param Layout - The assembler layout object to use for evaluating symbol
77 /// values. If not given, then only non-symbolic expressions will be
79 /// @result - True on success.
80 bool EvaluateAsAbsolute(int64_t &Res) const;
81 bool EvaluateAsAbsolute(int64_t &Res, const MCAssembler &Asm) const;
82 bool EvaluateAsAbsolute(int64_t &Res, const MCAsmLayout &Layout) const;
83 bool EvaluateAsAbsolute(int64_t &Res, const MCAsmLayout &Layout,
84 const SectionAddrMap &Addrs) const;
86 /// EvaluateAsRelocatable - Try to evaluate the expression to a relocatable
87 /// value, i.e. an expression of the fixed form (a - b + constant).
89 /// @param Res - The relocatable value, if evaluation succeeds.
90 /// @param Layout - The assembler layout object to use for evaluating values.
91 /// @result - True on success.
92 bool EvaluateAsRelocatable(MCValue &Res, const MCAsmLayout *Layout = 0) const;
96 static bool classof(const MCExpr *) { return true; }
99 inline raw_ostream &operator<<(raw_ostream &OS, const MCExpr &E) {
104 //// MCConstantExpr - Represent a constant integer expression.
105 class MCConstantExpr : public MCExpr {
108 explicit MCConstantExpr(int64_t _Value)
109 : MCExpr(MCExpr::Constant), Value(_Value) {}
112 /// @name Construction
115 static const MCConstantExpr *Create(int64_t Value, MCContext &Ctx);
121 int64_t getValue() const { return Value; }
125 static bool classof(const MCExpr *E) {
126 return E->getKind() == MCExpr::Constant;
128 static bool classof(const MCConstantExpr *) { return true; }
131 /// MCSymbolRefExpr - Represent a reference to a symbol from inside an
134 /// A symbol reference in an expression may be a use of a label, a use of an
135 /// assembler variable (defined constant), or constitute an implicit definition
136 /// of the symbol as external.
137 class MCSymbolRefExpr : public MCExpr {
156 VK_TLVP, // Mach-O thread local variable relocation
157 VK_ARM_HI16, // The R_ARM_MOVT_ABS relocation (:upper16: in the .s file)
158 VK_ARM_LO16, // The R_ARM_MOVW_ABS_NC relocation (:lower16: in the .w file)
159 // FIXME: We'd really like to use the generic Kinds listed above for these.
160 VK_ARM_PLT, // ARM-style PLT references. i.e., (PLT) instead of @PLT
161 VK_ARM_TLSGD, // ditto for TLSGD, GOT, GOTOFF, TPOFF and GOTTPOFF
168 VK_PPC_HA16, // ha16(symbol)
169 VK_PPC_LO16 // lo16(symbol)
173 /// The symbol being referenced.
174 const MCSymbol *Symbol;
176 /// The symbol reference modifier.
177 const VariantKind Kind;
179 explicit MCSymbolRefExpr(const MCSymbol *_Symbol, VariantKind _Kind)
180 : MCExpr(MCExpr::SymbolRef), Symbol(_Symbol), Kind(_Kind) {}
183 /// @name Construction
186 static const MCSymbolRefExpr *Create(const MCSymbol *Symbol, MCContext &Ctx) {
187 return MCSymbolRefExpr::Create(Symbol, VK_None, Ctx);
190 static const MCSymbolRefExpr *Create(const MCSymbol *Symbol, VariantKind Kind,
192 static const MCSymbolRefExpr *Create(StringRef Name, VariantKind Kind,
199 const MCSymbol &getSymbol() const { return *Symbol; }
201 VariantKind getKind() const { return Kind; }
204 /// @name Static Utility Functions
207 static StringRef getVariantKindName(VariantKind Kind);
209 static VariantKind getVariantKindForName(StringRef Name);
213 static bool classof(const MCExpr *E) {
214 return E->getKind() == MCExpr::SymbolRef;
216 static bool classof(const MCSymbolRefExpr *) { return true; }
219 /// MCUnaryExpr - Unary assembler expressions.
220 class MCUnaryExpr : public MCExpr {
223 LNot, ///< Logical negation.
224 Minus, ///< Unary minus.
225 Not, ///< Bitwise negation.
226 Plus ///< Unary plus.
233 MCUnaryExpr(Opcode _Op, const MCExpr *_Expr)
234 : MCExpr(MCExpr::Unary), Op(_Op), Expr(_Expr) {}
237 /// @name Construction
240 static const MCUnaryExpr *Create(Opcode Op, const MCExpr *Expr,
242 static const MCUnaryExpr *CreateLNot(const MCExpr *Expr, MCContext &Ctx) {
243 return Create(LNot, Expr, Ctx);
245 static const MCUnaryExpr *CreateMinus(const MCExpr *Expr, MCContext &Ctx) {
246 return Create(Minus, Expr, Ctx);
248 static const MCUnaryExpr *CreateNot(const MCExpr *Expr, MCContext &Ctx) {
249 return Create(Not, Expr, Ctx);
251 static const MCUnaryExpr *CreatePlus(const MCExpr *Expr, MCContext &Ctx) {
252 return Create(Plus, Expr, Ctx);
259 /// getOpcode - Get the kind of this unary expression.
260 Opcode getOpcode() const { return Op; }
262 /// getSubExpr - Get the child of this unary expression.
263 const MCExpr *getSubExpr() const { return Expr; }
267 static bool classof(const MCExpr *E) {
268 return E->getKind() == MCExpr::Unary;
270 static bool classof(const MCUnaryExpr *) { return true; }
273 /// MCBinaryExpr - Binary assembler expressions.
274 class MCBinaryExpr : public MCExpr {
278 And, ///< Bitwise and.
279 Div, ///< Signed division.
280 EQ, ///< Equality comparison.
281 GT, ///< Signed greater than comparison (result is either 0 or some
282 ///< target-specific non-zero value)
283 GTE, ///< Signed greater than or equal comparison (result is either 0 or
284 ///< some target-specific non-zero value).
285 LAnd, ///< Logical and.
286 LOr, ///< Logical or.
287 LT, ///< Signed less than comparison (result is either 0 or
288 ///< some target-specific non-zero value).
289 LTE, ///< Signed less than or equal comparison (result is either 0 or
290 ///< some target-specific non-zero value).
291 Mod, ///< Signed remainder.
292 Mul, ///< Multiplication.
293 NE, ///< Inequality comparison.
295 Shl, ///< Shift left.
296 Shr, ///< Shift right (arithmetic or logical, depending on target)
297 Sub, ///< Subtraction.
298 Xor ///< Bitwise exclusive or.
303 const MCExpr *LHS, *RHS;
305 MCBinaryExpr(Opcode _Op, const MCExpr *_LHS, const MCExpr *_RHS)
306 : MCExpr(MCExpr::Binary), Op(_Op), LHS(_LHS), RHS(_RHS) {}
309 /// @name Construction
312 static const MCBinaryExpr *Create(Opcode Op, const MCExpr *LHS,
313 const MCExpr *RHS, MCContext &Ctx);
314 static const MCBinaryExpr *CreateAdd(const MCExpr *LHS, const MCExpr *RHS,
316 return Create(Add, LHS, RHS, Ctx);
318 static const MCBinaryExpr *CreateAnd(const MCExpr *LHS, const MCExpr *RHS,
320 return Create(And, LHS, RHS, Ctx);
322 static const MCBinaryExpr *CreateDiv(const MCExpr *LHS, const MCExpr *RHS,
324 return Create(Div, LHS, RHS, Ctx);
326 static const MCBinaryExpr *CreateEQ(const MCExpr *LHS, const MCExpr *RHS,
328 return Create(EQ, LHS, RHS, Ctx);
330 static const MCBinaryExpr *CreateGT(const MCExpr *LHS, const MCExpr *RHS,
332 return Create(GT, LHS, RHS, Ctx);
334 static const MCBinaryExpr *CreateGTE(const MCExpr *LHS, const MCExpr *RHS,
336 return Create(GTE, LHS, RHS, Ctx);
338 static const MCBinaryExpr *CreateLAnd(const MCExpr *LHS, const MCExpr *RHS,
340 return Create(LAnd, LHS, RHS, Ctx);
342 static const MCBinaryExpr *CreateLOr(const MCExpr *LHS, const MCExpr *RHS,
344 return Create(LOr, LHS, RHS, Ctx);
346 static const MCBinaryExpr *CreateLT(const MCExpr *LHS, const MCExpr *RHS,
348 return Create(LT, LHS, RHS, Ctx);
350 static const MCBinaryExpr *CreateLTE(const MCExpr *LHS, const MCExpr *RHS,
352 return Create(LTE, LHS, RHS, Ctx);
354 static const MCBinaryExpr *CreateMod(const MCExpr *LHS, const MCExpr *RHS,
356 return Create(Mod, LHS, RHS, Ctx);
358 static const MCBinaryExpr *CreateMul(const MCExpr *LHS, const MCExpr *RHS,
360 return Create(Mul, LHS, RHS, Ctx);
362 static const MCBinaryExpr *CreateNE(const MCExpr *LHS, const MCExpr *RHS,
364 return Create(NE, LHS, RHS, Ctx);
366 static const MCBinaryExpr *CreateOr(const MCExpr *LHS, const MCExpr *RHS,
368 return Create(Or, LHS, RHS, Ctx);
370 static const MCBinaryExpr *CreateShl(const MCExpr *LHS, const MCExpr *RHS,
372 return Create(Shl, LHS, RHS, Ctx);
374 static const MCBinaryExpr *CreateShr(const MCExpr *LHS, const MCExpr *RHS,
376 return Create(Shr, LHS, RHS, Ctx);
378 static const MCBinaryExpr *CreateSub(const MCExpr *LHS, const MCExpr *RHS,
380 return Create(Sub, LHS, RHS, Ctx);
382 static const MCBinaryExpr *CreateXor(const MCExpr *LHS, const MCExpr *RHS,
384 return Create(Xor, LHS, RHS, Ctx);
391 /// getOpcode - Get the kind of this binary expression.
392 Opcode getOpcode() const { return Op; }
394 /// getLHS - Get the left-hand side expression of the binary operator.
395 const MCExpr *getLHS() const { return LHS; }
397 /// getRHS - Get the right-hand side expression of the binary operator.
398 const MCExpr *getRHS() const { return RHS; }
402 static bool classof(const MCExpr *E) {
403 return E->getKind() == MCExpr::Binary;
405 static bool classof(const MCBinaryExpr *) { return true; }
408 /// MCTargetExpr - This is an extension point for target-specific MCExpr
409 /// subclasses to implement.
411 /// NOTE: All subclasses are required to have trivial destructors because
412 /// MCExprs are bump pointer allocated and not destructed.
413 class MCTargetExpr : public MCExpr {
414 virtual void Anchor();
416 MCTargetExpr() : MCExpr(Target) {}
417 virtual ~MCTargetExpr() {}
420 virtual void PrintImpl(raw_ostream &OS) const = 0;
421 virtual bool EvaluateAsRelocatableImpl(MCValue &Res,
422 const MCAsmLayout *Layout) const = 0;
425 static bool classof(const MCExpr *E) {
426 return E->getKind() == MCExpr::Target;
428 static bool classof(const MCTargetExpr *) { return true; }
431 } // end namespace llvm