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359 lines
11 KiB
C++
359 lines
11 KiB
C++
//===- MCExpr.h - Assembly Level Expressions --------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCEXPR_H
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#define LLVM_MC_MCEXPR_H
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#include "llvm/Support/Casting.h"
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#include "llvm/System/DataTypes.h"
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namespace llvm {
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class MCAsmInfo;
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class MCContext;
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class MCSymbol;
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class MCValue;
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class raw_ostream;
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class StringRef;
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/// MCExpr - Base class for the full range of assembler expressions which are
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/// needed for parsing.
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class MCExpr {
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public:
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enum ExprKind {
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Binary, ///< Binary expressions.
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Constant, ///< Constant expressions.
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SymbolRef, ///< References to labels and assigned expressions.
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Unary, ///< Unary expressions.
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Target ///< Target specific expression.
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};
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private:
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ExprKind Kind;
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MCExpr(const MCExpr&); // DO NOT IMPLEMENT
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void operator=(const MCExpr&); // DO NOT IMPLEMENT
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protected:
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explicit MCExpr(ExprKind _Kind) : Kind(_Kind) {}
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public:
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/// @name Accessors
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/// @{
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ExprKind getKind() const { return Kind; }
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/// @}
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/// @name Utility Methods
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/// @{
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void print(raw_ostream &OS) const;
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void dump() const;
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/// @}
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/// @name Expression Evaluation
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/// @{
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/// EvaluateAsAbsolute - Try to evaluate the expression to an absolute value.
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///
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/// @param Res - The absolute value, if evaluation succeeds.
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/// @result - True on success.
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bool EvaluateAsAbsolute(int64_t &Res) const;
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/// EvaluateAsRelocatable - Try to evaluate the expression to a relocatable
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/// value, i.e. an expression of the fixed form (a - b + constant).
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///
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/// @param Res - The relocatable value, if evaluation succeeds.
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/// @result - True on success.
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bool EvaluateAsRelocatable(MCValue &Res) const;
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/// @}
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static bool classof(const MCExpr *) { return true; }
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};
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inline raw_ostream &operator<<(raw_ostream &OS, const MCExpr &E) {
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E.print(OS);
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return OS;
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}
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//// MCConstantExpr - Represent a constant integer expression.
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class MCConstantExpr : public MCExpr {
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int64_t Value;
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explicit MCConstantExpr(int64_t _Value)
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: MCExpr(MCExpr::Constant), Value(_Value) {}
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public:
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/// @name Construction
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/// @{
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static const MCConstantExpr *Create(int64_t Value, MCContext &Ctx);
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/// @}
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/// @name Accessors
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/// @{
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int64_t getValue() const { return Value; }
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/// @}
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static bool classof(const MCExpr *E) {
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return E->getKind() == MCExpr::Constant;
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}
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static bool classof(const MCConstantExpr *) { return true; }
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};
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/// MCSymbolRefExpr - Represent a reference to a symbol from inside an
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/// expression.
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///
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/// A symbol reference in an expression may be a use of a label, a use of an
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/// assembler variable (defined constant), or constitute an implicit definition
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/// of the symbol as external.
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class MCSymbolRefExpr : public MCExpr {
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const MCSymbol *Symbol;
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explicit MCSymbolRefExpr(const MCSymbol *_Symbol)
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: MCExpr(MCExpr::SymbolRef), Symbol(_Symbol) {}
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public:
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/// @name Construction
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/// @{
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static const MCSymbolRefExpr *Create(const MCSymbol *Symbol, MCContext &Ctx);
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static const MCSymbolRefExpr *Create(StringRef Name, MCContext &Ctx);
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/// @}
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/// @name Accessors
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/// @{
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const MCSymbol &getSymbol() const { return *Symbol; }
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/// @}
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static bool classof(const MCExpr *E) {
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return E->getKind() == MCExpr::SymbolRef;
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}
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static bool classof(const MCSymbolRefExpr *) { return true; }
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};
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/// MCUnaryExpr - Unary assembler expressions.
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class MCUnaryExpr : public MCExpr {
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public:
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enum Opcode {
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LNot, ///< Logical negation.
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Minus, ///< Unary minus.
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Not, ///< Bitwise negation.
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Plus ///< Unary plus.
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};
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private:
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Opcode Op;
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const MCExpr *Expr;
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MCUnaryExpr(Opcode _Op, const MCExpr *_Expr)
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: MCExpr(MCExpr::Unary), Op(_Op), Expr(_Expr) {}
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public:
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/// @name Construction
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/// @{
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static const MCUnaryExpr *Create(Opcode Op, const MCExpr *Expr,
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MCContext &Ctx);
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static const MCUnaryExpr *CreateLNot(const MCExpr *Expr, MCContext &Ctx) {
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return Create(LNot, Expr, Ctx);
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}
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static const MCUnaryExpr *CreateMinus(const MCExpr *Expr, MCContext &Ctx) {
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return Create(Minus, Expr, Ctx);
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}
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static const MCUnaryExpr *CreateNot(const MCExpr *Expr, MCContext &Ctx) {
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return Create(Not, Expr, Ctx);
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}
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static const MCUnaryExpr *CreatePlus(const MCExpr *Expr, MCContext &Ctx) {
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return Create(Plus, Expr, Ctx);
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}
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/// @}
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/// @name Accessors
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/// @{
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/// getOpcode - Get the kind of this unary expression.
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Opcode getOpcode() const { return Op; }
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/// getSubExpr - Get the child of this unary expression.
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const MCExpr *getSubExpr() const { return Expr; }
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/// @}
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static bool classof(const MCExpr *E) {
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return E->getKind() == MCExpr::Unary;
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}
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static bool classof(const MCUnaryExpr *) { return true; }
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};
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/// MCBinaryExpr - Binary assembler expressions.
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class MCBinaryExpr : public MCExpr {
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public:
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enum Opcode {
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Add, ///< Addition.
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And, ///< Bitwise and.
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Div, ///< Signed division.
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EQ, ///< Equality comparison.
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GT, ///< Signed greater than comparison (result is either 0 or some
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///< target-specific non-zero value)
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GTE, ///< Signed greater than or equal comparison (result is either 0 or
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///< some target-specific non-zero value).
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LAnd, ///< Logical and.
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LOr, ///< Logical or.
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LT, ///< Signed less than comparison (result is either 0 or
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///< some target-specific non-zero value).
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LTE, ///< Signed less than or equal comparison (result is either 0 or
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///< some target-specific non-zero value).
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Mod, ///< Signed remainder.
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Mul, ///< Multiplication.
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NE, ///< Inequality comparison.
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Or, ///< Bitwise or.
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Shl, ///< Shift left.
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Shr, ///< Shift right (arithmetic or logical, depending on target)
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Sub, ///< Subtraction.
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Xor ///< Bitwise exclusive or.
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};
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private:
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Opcode Op;
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const MCExpr *LHS, *RHS;
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MCBinaryExpr(Opcode _Op, const MCExpr *_LHS, const MCExpr *_RHS)
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: MCExpr(MCExpr::Binary), Op(_Op), LHS(_LHS), RHS(_RHS) {}
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public:
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/// @name Construction
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/// @{
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static const MCBinaryExpr *Create(Opcode Op, const MCExpr *LHS,
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const MCExpr *RHS, MCContext &Ctx);
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static const MCBinaryExpr *CreateAdd(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(Add, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateAnd(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(And, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateDiv(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(Div, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateEQ(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(EQ, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateGT(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(GT, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateGTE(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(GTE, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateLAnd(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(LAnd, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateLOr(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(LOr, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateLT(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(LT, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateLTE(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(LTE, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateMod(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(Mod, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateMul(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(Mul, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateNE(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(NE, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateOr(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(Or, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateShl(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(Shl, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateShr(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(Shr, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateSub(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(Sub, LHS, RHS, Ctx);
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}
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static const MCBinaryExpr *CreateXor(const MCExpr *LHS, const MCExpr *RHS,
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MCContext &Ctx) {
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return Create(Xor, LHS, RHS, Ctx);
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}
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/// @}
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/// @name Accessors
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/// @{
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/// getOpcode - Get the kind of this binary expression.
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Opcode getOpcode() const { return Op; }
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/// getLHS - Get the left-hand side expression of the binary operator.
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const MCExpr *getLHS() const { return LHS; }
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/// getRHS - Get the right-hand side expression of the binary operator.
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const MCExpr *getRHS() const { return RHS; }
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/// @}
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static bool classof(const MCExpr *E) {
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return E->getKind() == MCExpr::Binary;
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}
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static bool classof(const MCBinaryExpr *) { return true; }
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};
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/// MCTargetExpr - This is an extension point for target-specific MCExpr
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/// subclasses to implement.
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///
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/// NOTE: All subclasses are required to have trivial destructors because
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/// MCExprs are bump pointer allocated and not destructed.
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class MCTargetExpr : public MCExpr {
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virtual void Anchor();
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protected:
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MCTargetExpr() : MCExpr(Target) {}
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virtual ~MCTargetExpr() {}
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public:
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virtual void PrintImpl(raw_ostream &OS) const = 0;
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virtual bool EvaluateAsRelocatableImpl(MCValue &Res) const = 0;
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static bool classof(const MCExpr *E) {
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return E->getKind() == MCExpr::Target;
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}
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static bool classof(const MCTargetExpr *) { return true; }
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};
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} // end namespace llvm
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#endif
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