Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

558 lines (464 sloc) 17.806 kb
#ifndef __PExpr_H
#define __PExpr_H
/*
* Copyright (c) 1998-2000 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
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: PExpr.h,v 1.63 2002/11/09 19:20:48 steve Exp $"
#endif
# include <string>
# include "netlist.h"
# include "verinum.h"
# include "verireal.h"
# include "LineInfo.h"
class Design;
class Module;
class NetNet;
class NetExpr;
class NetScope;
/*
* The PExpr class hierarchy supports the description of
* expressions. The parser can generate expression objects from the
* source, possibly reducing things that it knows how to reduce.
*
* The elaborate_net method is used by structural elaboration to build
* up a netlist interpretation of the expression.
*/
class PExpr : public LineInfo {
public:
PExpr();
virtual ~PExpr();
virtual void dump(ostream&) const;
// Procedural elaboration of the expression. Set thie
// bare_memory_ok flag if the result is allowed to be a
// NetEMemory without an index.
virtual NetExpr*elaborate_expr(Design*des, NetScope*scope,
bool sys_task_arg =false) const;
// Elaborate expressions that are the r-value of parameter
// assignments. This elaboration follows the restrictions of
// constant expressions and supports later overriding and
// evaluation of parameters.
virtual NetExpr*elaborate_pexpr(Design*des, NetScope*sc) const;
// This method elaborate the expression as gates, for use in a
// continuous assign or other wholly structural context.
virtual NetNet* elaborate_net(Design*des, NetScope*scope,
unsigned lwidth,
unsigned long rise,
unsigned long fall,
unsigned long decay,
Link::strength_t drive0 =Link::STRONG,
Link::strength_t drive1 =Link::STRONG)
const;
// This method elaborates the expression as NetNet objects. It
// only allows regs suitable for procedural continuous assignments.
virtual NetNet* elaborate_anet(Design*des, NetScope*scope) const;
// This method elaborates the expression as gates, but
// restricted for use as l-values of continuous assignments.
virtual NetNet* elaborate_lnet(Design*des, NetScope*scope,
bool implicit_net_ok =false) const;
// Expressions that can be in the l-value of procedural
// assignments can be elaborated with this method.
virtual NetAssign_* elaborate_lval(Design*des, NetScope*scope) const;
// This attempts to evaluate a constant expression, and return
// a verinum as a result. If the expression cannot be
// evaluated, return 0.
virtual verinum* eval_const(const Design*des, const NetScope*sc) const;
// This attempts to evaluate a constant expression as a
// decimal floating point. This is used when calculating delay
// constants.
virtual verireal* eval_rconst(const Design*, const NetScope*) const;
// This method returns true if that expression is the same as
// this expression. This method is used for comparing
// expressions that must be structurally "identical".
virtual bool is_the_same(const PExpr*that) const;
// Return true if this expression is a valid constant
// expression. the Module pointer is needed to find parameter
// identifiers and any other module specific interpretations
// of expresions.
virtual bool is_constant(Module*) const;
private: // not implemented
PExpr(const PExpr&);
PExpr& operator= (const PExpr&);
};
ostream& operator << (ostream&, const PExpr&);
class PEConcat : public PExpr {
public:
PEConcat(const svector<PExpr*>&p, PExpr*r =0);
~PEConcat();
virtual void dump(ostream&) const;
// Concatenated Regs can be on the left of procedural
// continuous assignments.
virtual NetNet* elaborate_anet(Design*des, NetScope*scope) const;
virtual NetNet* elaborate_lnet(Design*des, NetScope*scope,
bool implicit_net_ok =false) const;
virtual NetNet* elaborate_net(Design*des, NetScope*scope,
unsigned width,
unsigned long rise,
unsigned long fall,
unsigned long decay,
Link::strength_t drive0,
Link::strength_t drive1) const;
virtual NetExpr*elaborate_expr(Design*des, NetScope*,
bool sys_task_arg =false) const;
virtual NetEConcat*elaborate_pexpr(Design*des, NetScope*) const;
virtual NetAssign_* elaborate_lval(Design*des, NetScope*scope) const;
virtual bool is_constant(Module*) const;
private:
svector<PExpr*>parms_;
PExpr*repeat_;
};
/*
* Event expressions are expressions that can be combined with the
* event "or" operator. These include "posedge foo" and similar, and
* also include named events. "edge" events are associated with an
* expression, whereas named events simply have a name, which
* represents an event variable.
*/
class PEEvent : public PExpr {
public:
enum edge_t {ANYEDGE, POSEDGE, NEGEDGE, POSITIVE};
// Use this constructor to create events based on edges or levels.
PEEvent(edge_t t, PExpr*e);
~PEEvent();
edge_t type() const;
PExpr* expr() const;
virtual void dump(ostream&) const;
private:
edge_t type_;
PExpr *expr_;
};
/*
* This holds a floating point constant in the source.
*/
class PEFNumber : public PExpr {
public:
explicit PEFNumber(verireal*vp);
~PEFNumber();
const verireal& value() const;
/* The eval_const method as applied to a floating point number
gets the *integer* value of the number. This accounts for
any rounding that is needed to get the value. */
virtual verinum* eval_const(const Design*des, const NetScope*sc) const;
/* This method returns the full floating point value. */
virtual verireal* eval_rconst(const Design*, const NetScope*) const;
/* A PEFNumber is a constant, so this returns true. */
virtual bool is_constant(Module*) const;
virtual NetExpr*elaborate_expr(Design*des, NetScope*,
bool sys_task_arg =false) const;
virtual NetExpr*elaborate_pexpr(Design*des, NetScope*sc) const;
virtual void dump(ostream&) const;
private:
verireal*value_;
};
class PEIdent : public PExpr {
public:
explicit PEIdent(const hname_t&s);
~PEIdent();
virtual void dump(ostream&) const;
// Regs can be on the left of procedural continuous assignments
virtual NetNet* elaborate_anet(Design*des, NetScope*scope) const;
// Identifiers are allowed (with restrictions) is assign l-values.
virtual NetNet* elaborate_lnet(Design*des, NetScope*scope,
bool implicit_net_ok =false) const;
// Identifiers are also allowed as procedural assignment l-values.
virtual NetAssign_* elaborate_lval(Design*des, NetScope*scope) const;
// Structural r-values are OK.
virtual NetNet* elaborate_net(Design*des, NetScope*scope,
unsigned lwidth,
unsigned long rise,
unsigned long fall,
unsigned long decay,
Link::strength_t drive0,
Link::strength_t drive1) const;
virtual NetExpr*elaborate_expr(Design*des, NetScope*,
bool sys_task_arg =false) const;
virtual NetExpr*elaborate_pexpr(Design*des, NetScope*sc) const;
// Elaborate the PEIdent as a port to a module. This method
// only applies to Ident expressions.
NetNet* elaborate_port(Design*des, NetScope*sc) const;
virtual bool is_constant(Module*) const;
verinum* eval_const(const Design*des, const NetScope*sc) const;
verireal*eval_rconst(const Design*des, const NetScope*sc) const;
const hname_t& path() const;
private:
hname_t path_;
public:
// Use these to support bit- and part-select operators.
PExpr*msb_;
PExpr*lsb_;
// If this is a reference to a memory, this is the index
// expression.
PExpr*idx_;
NetNet* elaborate_net_ram_(Design*des, NetScope*scope,
NetMemory*mem, unsigned lwidth,
unsigned long rise,
unsigned long fall,
unsigned long decay) const;
NetNet* elaborate_net_bitmux_(Design*des, NetScope*scope,
NetNet*sig,
unsigned long rise,
unsigned long fall,
unsigned long decay,
Link::strength_t drive0,
Link::strength_t drive1) const;
private:
NetAssign_* elaborate_mem_lval_(Design*des, NetScope*scope,
NetMemory*mem) const;
};
class PENumber : public PExpr {
public:
explicit PENumber(verinum*vp);
~PENumber();
const verinum& value() const;
virtual void dump(ostream&) const;
virtual NetNet* elaborate_net(Design*des, NetScope*scope,
unsigned lwidth,
unsigned long rise,
unsigned long fall,
unsigned long decay,
Link::strength_t drive0,
Link::strength_t drive1) const;
virtual NetEConst*elaborate_expr(Design*des, NetScope*,
bool sys_task_arg =false) const;
virtual NetExpr*elaborate_pexpr(Design*des, NetScope*sc) const;
virtual NetAssign_* elaborate_lval(Design*des, NetScope*scope) const;
virtual verinum* eval_const(const Design*des, const NetScope*sc) const;
virtual verireal*eval_rconst(const Design*, const NetScope*) const;
virtual bool is_the_same(const PExpr*that) const;
virtual bool is_constant(Module*) const;
private:
verinum*const value_;
};
/*
* This represents a string constant in an expression.
*
* The s parameter to the PEString constructor is a C string that this
* class instance will take for its own. The caller should not delete
* the string, the destructor will do it.
*/
class PEString : public PExpr {
public:
explicit PEString(char*s);
~PEString();
string value() const;
virtual void dump(ostream&) const;
virtual NetNet* elaborate_net(Design*des, NetScope*scope,
unsigned width,
unsigned long rise,
unsigned long fall,
unsigned long decay,
Link::strength_t drive0,
Link::strength_t drive1) const;
virtual NetEConst*elaborate_expr(Design*des, NetScope*,
bool sys_task_arg =false) const;
virtual NetEConst*elaborate_pexpr(Design*des, NetScope*sc) const;
verinum* PEString::eval_const(const Design*, const NetScope*) const;
virtual bool is_constant(Module*) const;
private:
char*text_;
};
class PEUnary : public PExpr {
public:
explicit PEUnary(char op, PExpr*ex);
~PEUnary();
virtual void dump(ostream&out) const;
virtual NetNet* elaborate_net(Design*des, NetScope*scope,
unsigned width,
unsigned long rise,
unsigned long fall,
unsigned long decay,
Link::strength_t drive0,
Link::strength_t drive1) const;
virtual NetExpr*elaborate_expr(Design*des, NetScope*,
bool sys_task_arg =false) const;
virtual NetExpr*elaborate_pexpr(Design*des, NetScope*sc) const;
virtual verinum* eval_const(const Design*des, const NetScope*sc) const;
virtual bool is_constant(Module*) const;
private:
char op_;
PExpr*expr_;
};
class PEBinary : public PExpr {
public:
explicit PEBinary(char op, PExpr*l, PExpr*r);
~PEBinary();
virtual bool is_constant(Module*) const;
virtual void dump(ostream&out) const;
virtual NetNet* elaborate_net(Design*des, NetScope*scope,
unsigned width,
unsigned long rise,
unsigned long fall,
unsigned long decay,
Link::strength_t drive0,
Link::strength_t drive1) const;
virtual NetEBinary*elaborate_expr(Design*des, NetScope*,
bool sys_task_arg =false) const;
virtual NetExpr*elaborate_pexpr(Design*des, NetScope*sc) const;
virtual verinum* eval_const(const Design*des, const NetScope*sc) const;
virtual verireal*eval_rconst(const Design*des, const NetScope*sc) const;
private:
char op_;
PExpr*left_;
PExpr*right_;
NetEBinary*elaborate_expr_base_(Design*, NetExpr*lp, NetExpr*rp) const;
NetNet* elaborate_net_add_(Design*des, NetScope*scope,
unsigned lwidth,
unsigned long rise,
unsigned long fall,
unsigned long decay) const;
NetNet* elaborate_net_bit_(Design*des, NetScope*scope,
unsigned lwidth,
unsigned long rise,
unsigned long fall,
unsigned long decay) const;
NetNet* elaborate_net_cmp_(Design*des, NetScope*scope,
unsigned lwidth,
unsigned long rise,
unsigned long fall,
unsigned long decay) const;
NetNet* elaborate_net_div_(Design*des, NetScope*scope,
unsigned lwidth,
unsigned long rise,
unsigned long fall,
unsigned long decay) const;
NetNet* elaborate_net_mod_(Design*des, NetScope*scope,
unsigned lwidth,
unsigned long rise,
unsigned long fall,
unsigned long decay) const;
NetNet* elaborate_net_log_(Design*des, NetScope*scope,
unsigned lwidth,
unsigned long rise,
unsigned long fall,
unsigned long decay) const;
NetNet* elaborate_net_mul_(Design*des, NetScope*scope,
unsigned lwidth,
unsigned long rise,
unsigned long fall,
unsigned long decay) const;
NetNet* elaborate_net_shift_(Design*des, NetScope*scope,
unsigned lwidth,
unsigned long rise,
unsigned long fall,
unsigned long decay) const;
};
/*
* This class supports the ternary (?:) operator. The operator takes
* three expressions, the test, the true result and the false result.
*/
class PETernary : public PExpr {
public:
explicit PETernary(PExpr*e, PExpr*t, PExpr*f);
~PETernary();
virtual bool is_constant(Module*) const;
virtual void dump(ostream&out) const;
virtual NetNet* elaborate_net(Design*des, NetScope*scope,
unsigned width,
unsigned long rise,
unsigned long fall,
unsigned long decay,
Link::strength_t drive0,
Link::strength_t drive1) const;
virtual NetETernary*elaborate_expr(Design*des, NetScope*,
bool sys_task_arg =false) const;
virtual NetETernary*elaborate_pexpr(Design*des, NetScope*sc) const;
virtual verinum* eval_const(const Design*des, const NetScope*sc) const;
private:
PExpr*expr_;
PExpr*tru_;
PExpr*fal_;
};
/*
* This class represents a parsed call to a function, including calls
* to system functions. The parameters in the parms list are the
* expressions that are passed as input to the ports of the function.
*/
class PECallFunction : public PExpr {
public:
explicit PECallFunction(const hname_t&n, const svector<PExpr *> &parms);
explicit PECallFunction(const hname_t&n);
~PECallFunction();
virtual void dump(ostream &) const;
virtual NetNet* elaborate_net(Design*des, NetScope*scope,
unsigned width,
unsigned long rise,
unsigned long fall,
unsigned long decay,
Link::strength_t drive0,
Link::strength_t drive1) const;
virtual NetExpr*elaborate_expr(Design*des, NetScope*scope,
bool sys_task_arg =false) const;
private:
hname_t path_;
svector<PExpr *> parms_;
bool check_call_matches_definition_(Design*des, NetScope*dscope) const;
NetExpr* elaborate_sfunc_(Design*des, NetScope*scope) const;
};
/*
* $Log: PExpr.h,v $
* Revision 1.63 2002/11/09 19:20:48 steve
* Port expressions for output ports are lnets, not nets.
*
* Revision 1.62 2002/08/12 01:34:58 steve
* conditional ident string using autoconfig.
*
* Revision 1.61 2002/06/04 05:38:43 steve
* Add support for memory words in l-value of
* blocking assignments, and remove the special
* NetAssignMem class.
*
* Revision 1.60 2002/05/23 03:08:51 steve
* Add language support for Verilog-2001 attribute
* syntax. Hook this support into existing $attribute
* handling, and add number and void value types.
*
* Add to the ivl_target API new functions for access
* of complex attributes attached to gates.
*
* Revision 1.59 2002/04/23 03:53:59 steve
* Add support for non-constant bit select.
*
* Revision 1.58 2002/04/14 03:55:25 steve
* Precalculate unary - if possible.
*
* Revision 1.57 2002/04/13 02:33:17 steve
* Detect missing indices to memories (PR#421)
*
* Revision 1.56 2002/03/09 04:02:26 steve
* Constant expressions are not l-values for task ports.
*
* Revision 1.55 2002/03/09 02:10:22 steve
* Add the NetUserFunc netlist node.
*
* Revision 1.54 2001/12/30 21:32:03 steve
* Support elaborate_net for PEString objects.
*
* Revision 1.53 2001/12/03 04:47:14 steve
* Parser and pform use hierarchical names as hname_t
* objects instead of encoded strings.
*
* Revision 1.52 2001/11/08 05:15:50 steve
* Remove string paths from PExpr elaboration.
*
* Revision 1.51 2001/11/07 04:26:46 steve
* elaborate_lnet uses scope instead of string path.
*
* Revision 1.50 2001/11/07 04:01:59 steve
* eval_const uses scope instead of a string path.
*/
#endif
Jump to Line
Something went wrong with that request. Please try again.