class MCValue;
/// MCExpr - Base class for the full range of assembler expressions which are
-/// needed for parsing.
+/// needed for parsing.
class MCExpr {
public:
enum ExprKind {
SymbolRef, ///< References to labels and assigned expressions.
Unary ///< Unary expressions.
};
-
+
private:
ExprKind Kind;
-
+
+ MCExpr(const MCExpr&); // DO NOT IMPLEMENT
+ void operator=(const MCExpr&); // DO NOT IMPLEMENT
+
protected:
MCExpr(ExprKind _Kind) : Kind(_Kind) {}
-
+
public:
- virtual ~MCExpr();
+ /// @name Accessors
+ /// @{
ExprKind getKind() const { return Kind; }
+ /// @}
+ /// @name Expression Evaluation
+ /// @{
+
/// EvaluateAsAbsolute - Try to evaluate the expression to an absolute value.
///
/// @param Res - The absolute value, if evaluation succeeds.
/// @result - True on success.
bool EvaluateAsRelocatable(MCContext &Ctx, MCValue &Res) const;
+ /// @}
+
static bool classof(const MCExpr *) { return true; }
};
class MCConstantExpr : public MCExpr {
int64_t Value;
-public:
- MCConstantExpr(int64_t _Value)
+ MCConstantExpr(int64_t _Value)
: MCExpr(MCExpr::Constant), Value(_Value) {}
-
+
+public:
+ /// @name Construction
+ /// @{
+
+ static const MCConstantExpr *Create(int64_t Value, MCContext &Ctx);
+
+ /// @}
+ /// @name Accessors
+ /// @{
+
int64_t getValue() const { return Value; }
- static bool classof(const MCExpr *E) {
- return E->getKind() == MCExpr::Constant;
+ /// @}
+
+ static bool classof(const MCExpr *E) {
+ return E->getKind() == MCExpr::Constant;
}
static bool classof(const MCConstantExpr *) { return true; }
};
/// assembler variable (defined constant), or constitute an implicit definition
/// of the symbol as external.
class MCSymbolRefExpr : public MCExpr {
- MCSymbol *Symbol;
+ const MCSymbol *Symbol;
-public:
- MCSymbolRefExpr(MCSymbol *_Symbol)
+ MCSymbolRefExpr(const MCSymbol *_Symbol)
: MCExpr(MCExpr::SymbolRef), Symbol(_Symbol) {}
-
- MCSymbol *getSymbol() const { return Symbol; }
- static bool classof(const MCExpr *E) {
- return E->getKind() == MCExpr::SymbolRef;
+public:
+ /// @name Construction
+ /// @{
+
+ static const MCSymbolRefExpr *Create(const MCSymbol *Symbol, MCContext &Ctx);
+
+ /// @}
+ /// @name Accessors
+ /// @{
+
+ const MCSymbol &getSymbol() const { return *Symbol; }
+
+ /// @}
+
+ static bool classof(const MCExpr *E) {
+ return E->getKind() == MCExpr::SymbolRef;
}
static bool classof(const MCSymbolRefExpr *) { return true; }
};
private:
Opcode Op;
- MCExpr *Expr;
+ const MCExpr *Expr;
-public:
- MCUnaryExpr(Opcode _Op, MCExpr *_Expr)
+ MCUnaryExpr(Opcode _Op, const MCExpr *_Expr)
: MCExpr(MCExpr::Unary), Op(_Op), Expr(_Expr) {}
- ~MCUnaryExpr() {
- delete Expr;
+
+public:
+ /// @name Construction
+ /// @{
+
+ static const MCUnaryExpr *Create(Opcode Op, const MCExpr *Expr,
+ MCContext &Ctx);
+ static const MCUnaryExpr *CreateLNot(const MCExpr *Expr, MCContext &Ctx) {
+ return Create(LNot, Expr, Ctx);
+ }
+ static const MCUnaryExpr *CreateMinus(const MCExpr *Expr, MCContext &Ctx) {
+ return Create(Minus, Expr, Ctx);
+ }
+ static const MCUnaryExpr *CreateNot(const MCExpr *Expr, MCContext &Ctx) {
+ return Create(Not, Expr, Ctx);
}
+ static const MCUnaryExpr *CreatePlus(const MCExpr *Expr, MCContext &Ctx) {
+ return Create(Plus, Expr, Ctx);
+ }
+
+ /// @}
+ /// @name Accessors
+ /// @{
+ /// getOpcode - Get the kind of this unary expression.
Opcode getOpcode() const { return Op; }
- MCExpr *getSubExpr() const { return Expr; }
+ /// getSubExpr - Get the child of this unary expression.
+ const MCExpr *getSubExpr() const { return Expr; }
- static bool classof(const MCExpr *E) {
- return E->getKind() == MCExpr::Unary;
+ /// @}
+
+ static bool classof(const MCExpr *E) {
+ return E->getKind() == MCExpr::Unary;
}
static bool classof(const MCUnaryExpr *) { return true; }
};
private:
Opcode Op;
- MCExpr *LHS, *RHS;
+ const MCExpr *LHS, *RHS;
-public:
- MCBinaryExpr(Opcode _Op, MCExpr *_LHS, MCExpr *_RHS)
+ MCBinaryExpr(Opcode _Op, const MCExpr *_LHS, const MCExpr *_RHS)
: MCExpr(MCExpr::Binary), Op(_Op), LHS(_LHS), RHS(_RHS) {}
- ~MCBinaryExpr() {
- delete LHS;
- delete RHS;
+
+public:
+ /// @name Construction
+ /// @{
+
+ static const MCBinaryExpr *Create(Opcode Op, const MCExpr *LHS,
+ const MCExpr *RHS, MCContext &Ctx);
+ static const MCBinaryExpr *CreateAdd(const MCExpr *LHS, const MCExpr *RHS,
+ MCContext &Ctx) {
+ return Create(Add, LHS, RHS, Ctx);
+ }
+ static const MCBinaryExpr *CreateAnd(const MCExpr *LHS, const MCExpr *RHS,
+ MCContext &Ctx) {
+ return Create(And, LHS, RHS, Ctx);
+ }
+ static const MCBinaryExpr *CreateDiv(const MCExpr *LHS, const MCExpr *RHS,
+ MCContext &Ctx) {
+ return Create(Div, LHS, RHS, Ctx);
+ }
+ static const MCBinaryExpr *CreateEQ(const MCExpr *LHS, const MCExpr *RHS,
+ MCContext &Ctx) {
+ return Create(EQ, LHS, RHS, Ctx);
+ }
+ static const MCBinaryExpr *CreateGT(const MCExpr *LHS, const MCExpr *RHS,
+ MCContext &Ctx) {
+ return Create(GT, LHS, RHS, Ctx);
+ }
+ static const MCBinaryExpr *CreateGTE(const MCExpr *LHS, const MCExpr *RHS,
+ MCContext &Ctx) {
+ return Create(GTE, LHS, RHS, Ctx);
+ }
+ static const MCBinaryExpr *CreateLAnd(const MCExpr *LHS, const MCExpr *RHS,
+ MCContext &Ctx) {
+ return Create(LAnd, LHS, RHS, Ctx);
}
+ static const MCBinaryExpr *CreateLOr(const MCExpr *LHS, const MCExpr *RHS,
+ MCContext &Ctx) {
+ return Create(LOr, LHS, RHS, Ctx);
+ }
+ static const MCBinaryExpr *CreateLT(const MCExpr *LHS, const MCExpr *RHS,
+ MCContext &Ctx) {
+ return Create(LT, LHS, RHS, Ctx);
+ }
+ static const MCBinaryExpr *CreateLTE(const MCExpr *LHS, const MCExpr *RHS,
+ MCContext &Ctx) {
+ return Create(LTE, LHS, RHS, Ctx);
+ }
+ static const MCBinaryExpr *CreateMod(const MCExpr *LHS, const MCExpr *RHS,
+ MCContext &Ctx) {
+ return Create(Mod, LHS, RHS, Ctx);
+ }
+ static const MCBinaryExpr *CreateMul(const MCExpr *LHS, const MCExpr *RHS,
+ MCContext &Ctx) {
+ return Create(Mul, LHS, RHS, Ctx);
+ }
+ static const MCBinaryExpr *CreateNE(const MCExpr *LHS, const MCExpr *RHS,
+ MCContext &Ctx) {
+ return Create(NE, LHS, RHS, Ctx);
+ }
+ static const MCBinaryExpr *CreateOr(const MCExpr *LHS, const MCExpr *RHS,
+ MCContext &Ctx) {
+ return Create(Or, LHS, RHS, Ctx);
+ }
+ static const MCBinaryExpr *CreateShl(const MCExpr *LHS, const MCExpr *RHS,
+ MCContext &Ctx) {
+ return Create(Shl, LHS, RHS, Ctx);
+ }
+ static const MCBinaryExpr *CreateShr(const MCExpr *LHS, const MCExpr *RHS,
+ MCContext &Ctx) {
+ return Create(Shr, LHS, RHS, Ctx);
+ }
+ static const MCBinaryExpr *CreateSub(const MCExpr *LHS, const MCExpr *RHS,
+ MCContext &Ctx) {
+ return Create(Sub, LHS, RHS, Ctx);
+ }
+ static const MCBinaryExpr *CreateXor(const MCExpr *LHS, const MCExpr *RHS,
+ MCContext &Ctx) {
+ return Create(Xor, LHS, RHS, Ctx);
+ }
+
+ /// @}
+ /// @name Accessors
+ /// @{
+ /// getOpcode - Get the kind of this binary expression.
Opcode getOpcode() const { return Op; }
/// getLHS - Get the left-hand side expression of the binary operator.
- MCExpr *getLHS() const { return LHS; }
+ const MCExpr *getLHS() const { return LHS; }
/// getRHS - Get the right-hand side expression of the binary operator.
- MCExpr *getRHS() const { return RHS; }
+ const MCExpr *getRHS() const { return RHS; }
+
+ /// @}
- static bool classof(const MCExpr *E) {
- return E->getKind() == MCExpr::Binary;
+ static bool classof(const MCExpr *E) {
+ return E->getKind() == MCExpr::Binary;
}
static bool classof(const MCBinaryExpr *) { return true; }
};
///
/// parenexpr ::= expr)
///
-bool AsmParser::ParseParenExpr(MCExpr *&Res) {
+bool AsmParser::ParseParenExpr(const MCExpr *&Res) {
if (ParseExpression(Res)) return true;
if (Lexer.isNot(AsmToken::RParen))
return TokError("expected ')' in parentheses expression");
/// primaryexpr ::= symbol
/// primaryexpr ::= number
/// primaryexpr ::= ~,+,- primaryexpr
-bool AsmParser::ParsePrimaryExpr(MCExpr *&Res) {
+bool AsmParser::ParsePrimaryExpr(const MCExpr *&Res) {
switch (Lexer.getKind()) {
default:
return TokError("unknown token in expression");
Lexer.Lex(); // Eat the operator.
if (ParsePrimaryExpr(Res))
return true;
- Res = new MCUnaryExpr(MCUnaryExpr::LNot, Res);
+ Res = MCUnaryExpr::CreateLNot(Res, Ctx);
return false;
case AsmToken::String:
case AsmToken::Identifier: {
// handle things like LFOO+4.
MCSymbol *Sym = CreateSymbol(Lexer.getTok().getIdentifier());
- Res = new MCSymbolRefExpr(Sym);
+ Res = MCSymbolRefExpr::Create(Sym, Ctx);
Lexer.Lex(); // Eat identifier.
return false;
}
case AsmToken::Integer:
- Res = new MCConstantExpr(Lexer.getTok().getIntVal());
+ Res = MCConstantExpr::Create(Lexer.getTok().getIntVal(), Ctx);
Lexer.Lex(); // Eat token.
return false;
case AsmToken::LParen:
Lexer.Lex(); // Eat the operator.
if (ParsePrimaryExpr(Res))
return true;
- Res = new MCUnaryExpr(MCUnaryExpr::Minus, Res);
+ Res = MCUnaryExpr::CreateMinus(Res, Ctx);
return false;
case AsmToken::Plus:
Lexer.Lex(); // Eat the operator.
if (ParsePrimaryExpr(Res))
return true;
- Res = new MCUnaryExpr(MCUnaryExpr::Plus, Res);
+ Res = MCUnaryExpr::CreatePlus(Res, Ctx);
return false;
case AsmToken::Tilde:
Lexer.Lex(); // Eat the operator.
if (ParsePrimaryExpr(Res))
return true;
- Res = new MCUnaryExpr(MCUnaryExpr::Not, Res);
+ Res = MCUnaryExpr::CreateNot(Res, Ctx);
return false;
}
}
/// expr ::= expr *,/,%,<<,>> expr -> highest.
/// expr ::= primaryexpr
///
-bool AsmParser::ParseExpression(MCExpr *&Res) {
+bool AsmParser::ParseExpression(const MCExpr *&Res) {
Res = 0;
return ParsePrimaryExpr(Res) ||
ParseBinOpRHS(1, Res);
}
bool AsmParser::ParseAbsoluteExpression(int64_t &Res) {
- MCExpr *Expr;
+ const MCExpr *Expr;
SMLoc StartLoc = Lexer.getLoc();
if (ParseExpression(Expr))
}
bool AsmParser::ParseRelocatableExpression(MCValue &Res) {
- MCExpr *Expr;
+ const MCExpr *Expr;
SMLoc StartLoc = Lexer.getLoc();
if (ParseExpression(Expr))
}
bool AsmParser::ParseParenRelocatableExpression(MCValue &Res) {
- MCExpr *Expr;
+ const MCExpr *Expr;
SMLoc StartLoc = Lexer.getLoc();
if (ParseParenExpr(Expr))
/// ParseBinOpRHS - Parse all binary operators with precedence >= 'Precedence'.
/// Res contains the LHS of the expression on input.
-bool AsmParser::ParseBinOpRHS(unsigned Precedence, MCExpr *&Res) {
+bool AsmParser::ParseBinOpRHS(unsigned Precedence, const MCExpr *&Res) {
while (1) {
MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add;
unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);
Lexer.Lex();
// Eat the next primary expression.
- MCExpr *RHS;
+ const MCExpr *RHS;
if (ParsePrimaryExpr(RHS)) return true;
// If BinOp binds less tightly with RHS than the operator after RHS, let
}
// Merge LHS and RHS according to operator.
- Res = new MCBinaryExpr(Kind, Res, RHS);
+ Res = MCBinaryExpr::Create(Kind, Res, RHS, Ctx);
}
}