256 lines
6.6 KiB
C++
256 lines
6.6 KiB
C++
#ifndef __expression_H
|
|
#define __expression_H
|
|
/*
|
|
* Copyright (c) 2011 Stephen Williams (steve@icarus.com)
|
|
*
|
|
* This source code is free software; you can redistribute it
|
|
* and/or modify it in source code form under the terms of the GNU
|
|
* General Public License as published by the Free Software
|
|
* Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
|
|
*/
|
|
|
|
# include "StringHeap.h"
|
|
# include "LineInfo.h"
|
|
# include <inttypes.h>
|
|
|
|
class Entity;
|
|
class Architecture;
|
|
class ScopeBase;
|
|
|
|
class ExpName;
|
|
|
|
/*
|
|
* The Expression class represents parsed expressions from the parsed
|
|
* VHDL input. The Expression class is a virtual class that holds more
|
|
* specific derived expression types.
|
|
*/
|
|
class Expression : public LineInfo {
|
|
|
|
public:
|
|
Expression();
|
|
virtual ~Expression() =0;
|
|
|
|
// The emit virtual method is called by architecture emit to
|
|
// output the generated code for the expression. The derived
|
|
// class fills in the details of what exactly happened.
|
|
virtual int emit(ostream&out, Entity*ent, Architecture*arc) =0;
|
|
|
|
// The evaluate virtual method tries to evaluate expressions
|
|
// to constant literal values. Return true and set the val
|
|
// argument if the evaluation works, or return false if it
|
|
// cannot be done.
|
|
virtual bool evaluate(ScopeBase*scope, int64_t&val) const;
|
|
|
|
// This method returns true if the drawn Verilog for this
|
|
// expression is a primary. A containing expression can use
|
|
// this method to know if it needs to wrap parentheses. This
|
|
// is somewhat optional, so it is better to return false if
|
|
// not certain. The default implementation does return false.
|
|
virtual bool is_primary(void) const;
|
|
|
|
// Debug dump of the expression.
|
|
virtual void dump(ostream&out, int indent = 0) const =0;
|
|
|
|
private:
|
|
|
|
private: // Not implemented
|
|
Expression(const Expression&);
|
|
Expression& operator = (const Expression&);
|
|
};
|
|
|
|
class ExpUnary : public Expression {
|
|
|
|
public:
|
|
ExpUnary(Expression*op1);
|
|
~ExpUnary();
|
|
|
|
protected:
|
|
int emit_operand1(ostream&out, Entity*ent, Architecture*arc);
|
|
void dump_operand1(ostream&out, int indent = 0) const;
|
|
|
|
private:
|
|
Expression*operand1_;
|
|
};
|
|
|
|
/*
|
|
* This is an abstract class that collects some of the common features
|
|
* of binary operators.
|
|
*/
|
|
class ExpBinary : public Expression {
|
|
|
|
public:
|
|
ExpBinary(Expression*op1, Expression*op2);
|
|
~ExpBinary();
|
|
|
|
protected:
|
|
|
|
int emit_operand1(ostream&out, Entity*ent, Architecture*arc);
|
|
int emit_operand2(ostream&out, Entity*ent, Architecture*arc);
|
|
|
|
bool eval_operand1(ScopeBase*scope, int64_t&val) const;
|
|
bool eval_operand2(ScopeBase*scope, int64_t&val) const;
|
|
|
|
void dump_operands(ostream&out, int indent = 0) const;
|
|
|
|
private:
|
|
Expression*operand1_;
|
|
Expression*operand2_;
|
|
};
|
|
|
|
class ExpArithmetic : public ExpBinary {
|
|
|
|
public:
|
|
enum fun_t { PLUS, MINUS, MULT, DIV, MOD, REM, POW };
|
|
|
|
public:
|
|
ExpArithmetic(ExpArithmetic::fun_t op, Expression*op1, Expression*op2);
|
|
~ExpArithmetic();
|
|
|
|
int emit(ostream&out, Entity*ent, Architecture*arc);
|
|
virtual bool evaluate(ScopeBase*scope, int64_t&val) const;
|
|
void dump(ostream&out, int indent = 0) const;
|
|
|
|
private:
|
|
fun_t fun_;
|
|
};
|
|
|
|
class ExpAttribute : public Expression {
|
|
|
|
public:
|
|
ExpAttribute(ExpName*base, perm_string name);
|
|
~ExpAttribute();
|
|
|
|
int emit(ostream&out, Entity*ent, Architecture*arc);
|
|
void dump(ostream&out, int indent = 0) const;
|
|
|
|
private:
|
|
ExpName*base_;
|
|
perm_string name_;
|
|
};
|
|
|
|
class ExpCharacter : public Expression {
|
|
|
|
public:
|
|
ExpCharacter(char val);
|
|
~ExpCharacter();
|
|
|
|
int emit(ostream&out, Entity*ent, Architecture*arc);
|
|
bool is_primary(void) const;
|
|
void dump(ostream&out, int indent = 0) const;
|
|
|
|
private:
|
|
char value_;
|
|
};
|
|
|
|
class ExpInteger : public Expression {
|
|
|
|
public:
|
|
ExpInteger(int64_t val);
|
|
~ExpInteger();
|
|
|
|
int emit(ostream&out, Entity*ent, Architecture*arc);
|
|
bool is_primary(void) const;
|
|
bool evaluate(ScopeBase*scope, int64_t&val) const;
|
|
void dump(ostream&out, int indent = 0) const;
|
|
|
|
private:
|
|
int64_t value_;
|
|
};
|
|
|
|
class ExpLogical : public ExpBinary {
|
|
|
|
public:
|
|
enum fun_t { AND, OR, NAND, NOR, XOR, XNOR };
|
|
|
|
public:
|
|
ExpLogical(ExpLogical::fun_t ty, Expression*op1, Expression*op2);
|
|
~ExpLogical();
|
|
|
|
int emit(ostream&out, Entity*ent, Architecture*arc);
|
|
void dump(ostream&out, int indent = 0) const;
|
|
|
|
private:
|
|
fun_t fun_;
|
|
};
|
|
|
|
/*
|
|
* The ExpName class represents an expression that is an identifier or
|
|
* other sort of name. The ExpNameALL is a special case of ExpName
|
|
* that represents the "all" keyword is contexts that can handle it.
|
|
*/
|
|
class ExpName : public Expression {
|
|
|
|
public:
|
|
explicit ExpName(perm_string nn);
|
|
ExpName(perm_string nn, Expression*index);
|
|
~ExpName();
|
|
|
|
public: // Base methods
|
|
int emit(ostream&out, Entity*ent, Architecture*arc);
|
|
bool is_primary(void) const;
|
|
bool evaluate(ScopeBase*scope, int64_t&val) const;
|
|
void dump(ostream&out, int indent = 0) const;
|
|
const char* name() const;
|
|
|
|
private:
|
|
perm_string name_;
|
|
Expression*index_;
|
|
};
|
|
|
|
class ExpNameALL : public ExpName {
|
|
|
|
public:
|
|
ExpNameALL() : ExpName(perm_string()) { }
|
|
|
|
public:
|
|
void dump(ostream&out, int indent =0) const;
|
|
};
|
|
|
|
class ExpRelation : public ExpBinary {
|
|
|
|
public:
|
|
enum fun_t { EQ, LT, GT, NEQ, LE, GE };
|
|
|
|
public:
|
|
ExpRelation(ExpRelation::fun_t ty, Expression*op1, Expression*op2);
|
|
~ExpRelation();
|
|
|
|
int emit(ostream&out, Entity*ent, Architecture*arc);
|
|
void dump(ostream&out, int indent = 0) const;
|
|
|
|
private:
|
|
fun_t fun_;
|
|
};
|
|
|
|
class ExpUAbs : public ExpUnary {
|
|
|
|
public:
|
|
ExpUAbs(Expression*op1);
|
|
~ExpUAbs();
|
|
|
|
int emit(ostream&out, Entity*ent, Architecture*arc);
|
|
void dump(ostream&out, int indent = 0) const;
|
|
};
|
|
|
|
class ExpUNot : public ExpUnary {
|
|
|
|
public:
|
|
ExpUNot(Expression*op1);
|
|
~ExpUNot();
|
|
|
|
int emit(ostream&out, Entity*ent, Architecture*arc);
|
|
void dump(ostream&out, int indent = 0) const;
|
|
};
|
|
|
|
#endif
|