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#ifndef __target_H
#define __target_H
* Copyright (c) 1998-1999 Stephen Williams (
* 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
* 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
#if !defined(WINNT) && !defined(macintosh)
#ident "$Id: target.h,v 1.56 2002/01/28 00:52:41 steve Exp $"
# include "netlist.h"
* This header file describes the types and constants used to describe
* the possible target output types of the compiler. The backends
* provide one of these in order to tell the previous steps what the
* backend is able to do.
* The backend driver is hooked into the compiler, and given a name,
* by creating an instance of the target structure. The structure has
* the name that the compiler will use to locate the driver, and a
* pointer to a target_t object that is the actual driver.
struct target {
const char* name;
struct target_t* meth;
* The emit process uses a target_t driver to send the completed
* design to a file. It is up to the driver object to follow along in
* the iteration through the design, generating output as it can.
struct target_t {
virtual ~target_t();
/* Start the design. This sets the main output file stream
that the target should use. */
virtual bool start_design(const Design*) =0;
/* This is called once for each scope in the design, before
anything else is called. */
virtual void scope(const NetScope*);
/* Output an event object. Called for each named event in the scope. */
virtual void event(const NetEvent*);
/* Output a signal (called for each signal) */
virtual void signal(const NetNet*) =0;
/* Output a memory (called for each memory object) */
virtual void memory(const NetMemory*);
/* Output a defined task. */
virtual void task_def(const NetScope*);
virtual void func_def(const NetScope*);
/* LPM style components are handled here. */
virtual void lpm_add_sub(const NetAddSub*);
virtual void lpm_clshift(const NetCLShift*);
virtual void lpm_compare(const NetCompare*);
virtual void lpm_divide(const NetDivide*);
virtual void lpm_modulo(const NetModulo*);
virtual void lpm_ff(const NetFF*);
virtual void lpm_mult(const NetMult*);
virtual void lpm_mux(const NetMux*);
virtual void lpm_ram_dq(const NetRamDq*);
/* Output a gate (called for each gate) */
virtual void logic(const NetLogic*);
virtual bool bufz(const NetBUFZ*);
virtual void udp(const NetUDP*);
virtual void net_case_cmp(const NetCaseCmp*);
virtual bool net_cassign(const NetCAssign*);
virtual bool net_const(const NetConst*);
virtual bool net_force(const NetForce*);
virtual void net_probe(const NetEvProbe*);
/* Output a process (called for each process). It is up to the
target to recurse if desired. */
virtual bool process(const NetProcTop*);
/* Various kinds of process nodes are dispatched through these. */
virtual void proc_assign(const NetAssign*);
virtual void proc_assign_mem(const NetAssignMem*);
virtual void proc_assign_nb(const NetAssignNB*);
virtual void proc_assign_mem_nb(const NetAssignMemNB*);
virtual bool proc_block(const NetBlock*);
virtual void proc_case(const NetCase*);
virtual bool proc_cassign(const NetCAssign*);
virtual bool proc_condit(const NetCondit*);
virtual bool proc_deassign(const NetDeassign*);
virtual bool proc_delay(const NetPDelay*);
virtual bool proc_disable(const NetDisable*);
virtual bool proc_force(const NetForce*);
virtual void proc_forever(const NetForever*);
virtual bool proc_release(const NetRelease*);
virtual void proc_repeat(const NetRepeat*);
virtual bool proc_trigger(const NetEvTrig*);
virtual void proc_stask(const NetSTask*);
virtual void proc_utask(const NetUTask*);
virtual bool proc_wait(const NetEvWait*);
virtual void proc_while(const NetWhile*);
/* Done with the design. The target returns !0 if there is
some error in the code generation. */
virtual int end_design(const Design*);
/* This class is used by the NetExpr class to help with the scanning
of expressions. */
struct expr_scan_t {
virtual ~expr_scan_t();
virtual void expr_const(const NetEConst*);
virtual void expr_concat(const NetEConcat*);
virtual void expr_memory(const NetEMemory*);
virtual void expr_scope(const NetEScope*);
virtual void expr_select(const NetESelect*);
virtual void expr_sfunc(const NetESFunc*);
virtual void expr_signal(const NetESignal*);
virtual void expr_subsignal(const NetEBitSel*);
virtual void expr_ternary(const NetETernary*);
virtual void expr_ufunc(const NetEUFunc*);
virtual void expr_unary(const NetEUnary*);
virtual void expr_binary(const NetEBinary*);
/* The emit functions take a design and emit it to the output stream
using the specified target. If the target is given by name, it is
located in the target_table and used. */
extern bool emit(const Design*des, const char*type);
/* This function takes a fully qualified verilog name (which may have,
for example, dots in it) and produces a mangled version that can be
used by most any language. */
extern string mangle(const string&str);
/* This function takes a string and produces an escaped version that can be
used inside a string constant for a C++ compiler. */
extern string stresc(const string&str);
/* This is the table of supported output targets. It is a null
terminated array of pointers to targets. */
extern const struct target *target_table[];
* $Log: target.h,v $
* Revision 1.56 2002/01/28 00:52:41 steve
* Add support for bit select of parameters.
* This leads to a NetESelect node and the
* vvp code generator to support that.
* Revision 1.55 2002/01/19 19:02:08 steve
* Pass back target errors processing conditionals.
* Revision 1.54 2001/08/25 23:50:03 steve
* Change the NetAssign_ class to refer to the signal
* instead of link into the netlist. This is faster
* and uses less space. Make the NetAssignNB carry
* the delays instead of the NetAssign_ lval objects.
* Change the vvp code generator to support multiple
* l-values, i.e. concatenations of part selects.
* Revision 1.53 2001/07/27 04:51:44 steve
* Handle part select expressions as variants of
* NetESignal/IVL_EX_SIGNAL objects, instead of
* creating new and useless temporary signals.
* Revision 1.52 2001/04/22 23:09:46 steve
* More UDP consolidation from Stephan Boettcher.
* Revision 1.51 2001/04/06 02:28:02 steve
* Generate vvp code for functions with ports.
* Revision 1.50 2001/04/02 02:28:13 steve
* Generate code for task calls.
* Revision 1.49 2001/03/27 03:31:06 steve
* Support error code from target_t::end_design method.
* Revision 1.48 2000/11/04 01:54:01 steve
* Modifications in support of gcc 2.96
* Revision 1.47 2000/09/26 01:35:43 steve
* Remove the obsolete NetEIdent class.
* Revision 1.46 2000/09/17 21:26:16 steve
* Add support for modulus (Eric Aardoom)
* Revision 1.45 2000/09/02 20:54:21 steve
* Rearrange NetAssign to make NetAssign_ separate.
* Revision 1.44 2000/08/27 15:51:51 steve
* t-dll iterates signals, and passes them to the
* target module.
* Some of NetObj should return char*, not string.
* Revision 1.43 2000/08/14 04:39:57 steve
* add th t-dll functions for net_const, net_bufz and processes.
* Revision 1.42 2000/08/09 03:43:45 steve
* Move all file manipulation out of target class.
* Revision 1.41 2000/08/08 01:50:42 steve
* target methods need not take a file stream.
* Revision 1.40 2000/07/29 16:21:08 steve
* Report code generation errors through proc_delay.
* Revision 1.39 2000/07/27 05:13:44 steve
* Support elaboration of disable statements.
* Revision 1.38 2000/05/11 23:37:27 steve
* Add support for procedural continuous assignment.
* Revision 1.37 2000/05/04 03:37:59 steve
* Add infrastructure for system functions, move
* $time to that structure and add $random.
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