Bring analog contribution statements to the ivl_target API.

Add support for analog processes with analog contributation statements
all the way down to the ivl_target code generator API.

Makefile.in

@@ -113,7 +113,7 @@ distclean: clean
 	rm -f Makefile config.status config.log config.cache config.h
 	rm -f _pli_types.h
 
-TT = t-dll.o t-dll-api.o t-dll-expr.o t-dll-proc.o
+TT = t-dll.o t-dll-api.o t-dll-expr.o t-dll-proc.o t-dll-analog.o
 FF = cprop.o nodangle.o synth.o synth2.o syn-rules.o
 
 O = main.o async.o design_dump.o discipline.o dup_expr.o \

emit.cc

@@ -192,9 +192,7 @@ bool NetProcTop::emit(struct target_t*tgt) const
 
 bool NetAnalogTop::emit(struct target_t*tgt) const
 {
-      cerr << get_fileline() << ": sorry: "
-	   << "I don't know how to emit for analog processes." << endl;
-      return false;
+      return tgt->process(this);
 }
 
 bool NetProc::emit_proc(struct target_t*tgt) const
@@ -241,6 +239,11 @@ bool NetCondit::emit_proc(struct target_t*tgt) const
       return tgt->proc_condit(this);
 }
 
+bool NetContribution::emit_proc(struct target_t*tgt) const
+{
+      return tgt->proc_contribution(this);
+}
+
 bool NetDeassign::emit_proc(struct target_t*tgt) const
 {
       return tgt->proc_deassign(this);

ivl.def

@@ -196,6 +196,7 @@ ivl_signal_width
 ivl_path_delay
 ivl_path_source
 
+ivl_process_analog
 ivl_process_attr_cnt
 ivl_process_attr_val
 ivl_process_file
@@ -221,6 +222,7 @@ ivl_stmt_delay_val
 ivl_stmt_events
 ivl_stmt_file
 ivl_stmt_lineno
+ivl_stmt_lexp
 ivl_stmt_lval
 ivl_stmt_lvals
 ivl_stmt_lwidth

ivl_target.h

@@ -361,6 +361,7 @@ typedef enum ivl_statement_type_e {
       IVL_ST_CASEZ   = 7,
       IVL_ST_CASSIGN = 8,
       IVL_ST_CONDIT  = 9,
+      IVL_ST_CONTRIB = 27,
       IVL_ST_DEASSIGN = 10,
       IVL_ST_DELAY   = 11,
       IVL_ST_DELAYX  = 12,
@@ -1718,9 +1719,13 @@ extern ivl_attribute_t ivl_signal_attr_val(ivl_signal_t net, unsigned idx);
  * is translated into a type and a single statement. (The statement
  * may be a compound statement.)
  *
- * The ivl_process_type function gets the type of the process,
- * an "initial" or "always" statement.
+ * ivl_process_type
+ * ivl_process_analog
+ *    The ivl_process_type function returns the type of the process,
+ *    an "initial" or "always" statement. The ivl_process_analog
+ *    returns true if the process is analog.
  *
+ * ivl_process_scope
  *    A process is placed in a scope. The statement within the process
  *    operates within the scope of the process unless there are calls
  *    outside the scope.
@@ -1733,6 +1738,7 @@ extern ivl_attribute_t ivl_signal_attr_val(ivl_signal_t net, unsigned idx);
  * attr_val methods return those attributes.
  */
 extern ivl_process_type_t ivl_process_type(ivl_process_t net);
+extern int ivl_process_analog(ivl_process_t net);
 
 extern ivl_scope_t ivl_process_scope(ivl_process_t net);
 
@@ -1828,6 +1834,12 @@ extern unsigned ivl_stmt_lineno(ivl_statement_t net);
  * that constant value. If the expression is non-constant, the code
  * generator is supposed to know what to do about that, too.
  *
+ * - IVL_ST_CONTRIB
+ * This is an analog contribution statement. The ivl_stmt_lexp
+ * function returns the l-value expression which is guaranteed to be a
+ * branch access expression. The ivl_stmt_rval returns the r-value
+ * expression for the assignment.
+ *
  * - IVL_ST_DELAY, IVL_ST_DELAYX
  * These statement types are delay statements. They are a way to
  * attach a delay to a statement. The ivl_stmt_sub_stmt() function
@@ -1893,6 +1905,8 @@ extern uint64_t ivl_stmt_delay_val(ivl_statement_t net);
   /* IVL_ST_WAIT IVL_ST_TRIGGER */
 extern unsigned    ivl_stmt_nevent(ivl_statement_t net);
 extern ivl_event_t ivl_stmt_events(ivl_statement_t net, unsigned idx);
+  /* IVL_ST_CONTRIB */
+extern ivl_expr_t ivl_stmt_lexp(ivl_statement_t net);
   /* IVL_ST_ASSIGN IVL_ST_ASSIGN_NB IVL_ST_CASSIGN IVL_ST_DEASSIGN
      IVL_ST_FORCE IVL_ST_RELEASE */
 extern ivl_lval_t ivl_stmt_lval(ivl_statement_t net, unsigned idx);
@@ -1907,7 +1921,8 @@ extern const char* ivl_stmt_name(ivl_statement_t net);
 extern ivl_expr_t ivl_stmt_parm(ivl_statement_t net, unsigned idx);
   /* IVL_ST_STASK */
 extern unsigned ivl_stmt_parm_count(ivl_statement_t net);
-  /* IVL_ST_ASSIGN IVL_ST_ASSIGN_NB IVL_ST_CASSIGN IVL_ST_FORCE */
+  /* IVL_ST_ASSIGN IVL_ST_ASSIGN_NB IVL_ST_CASSIGN IVL_ST_CONTRIB
+     IVL_ST_FORCE */
 extern ivl_expr_t ivl_stmt_rval(ivl_statement_t net);
   /* IVL_ST_DELAY, IVL_ST_DELAYX, IVL_ST_FOREVER, IVL_ST_REPEAT
      IVL_ST_WAIT, IVL_ST_WHILE */

net_analog.cc

@@ -35,3 +35,13 @@ NetContribution::NetContribution(NetEAccess*l, NetExpr*r)
 NetContribution::~NetContribution()
 {
 }
+
+const NetEAccess* NetContribution::lval() const
+{
+      return lval_;
+}
+
+const NetExpr* NetContribution::rval() const
+{
+      return rval_;
+}

netlist.cc

@@ -874,6 +874,11 @@ NetScope* NetProcTop::scope()
       return scope_;
 }
 
+const NetScope* NetProcTop::scope() const
+{
+      return scope_;
+}
+
 NetAnalogTop::NetAnalogTop(NetScope*scope, ivl_process_type_t t, NetProc*st)
 : type_(t), statement_(st), scope_(scope)
 {
@@ -884,7 +889,22 @@ NetAnalogTop::~NetAnalogTop()
 {
 }
 
-const NetScope* NetProcTop::scope() const
+NetProc* NetAnalogTop::statement()
+{
+      return statement_;
+}
+
+const NetProc* NetAnalogTop::statement() const
+{
+      return statement_;
+}
+
+NetScope* NetAnalogTop::scope()
+{
+      return scope_;
+}
+
+const NetScope* NetAnalogTop::scope() const
 {
       return scope_;
 }

netlist.h

@@ -2439,6 +2439,10 @@ class NetContribution : public NetProc {
       explicit NetContribution(NetEAccess*lval, NetExpr*rval);
       ~NetContribution();
 
+      const NetEAccess* lval() const;
+      const NetExpr* rval() const;
+
+      virtual bool emit_proc(struct target_t*) const;
       virtual void dump(ostream&, unsigned ind) const;
 
     private:

t-dll-analog.cc

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2008 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.will need a Picture Elements Binary Software
+ *    License.
+ *
+ *    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 "config.h"
+
+# include  <iostream>
+
+# include  <cstring>
+# include  "target.h"
+# include  "ivl_target.h"
+# include  "compiler.h"
+# include  "t-dll.h"
+#ifdef HAVE_MALLOC_H
+# include  <malloc.h>
+#endif
+# include  <stdlib.h>
+
+bool dll_target::process(const NetAnalogTop*net)
+{
+      bool rc_flag = true;
+
+      ivl_process_t obj = (struct ivl_process_s*)
+	    calloc(1, sizeof(struct ivl_process_s));
+
+      obj->type_ = net->type();
+      obj->analog_flag = 1;
+
+      FILE_NAME(obj, net);
+
+	/* Save the scope of the process. */
+      obj->scope_ = lookup_scope_(net->scope());
+
+      obj->nattr = net->attr_cnt();
+      obj->attr = fill_in_attributes(net);
+
+      assert(stmt_cur_ == 0);
+      stmt_cur_ = (struct ivl_statement_s*)calloc(1, sizeof*stmt_cur_);
+      assert(stmt_cur_);
+      rc_flag = net->statement()->emit_proc(this) && rc_flag;
+
+      assert(stmt_cur_);
+      obj->stmt_ = stmt_cur_;
+      stmt_cur_ = 0;
+
+	/* Save the process in the design. */
+      obj->next_ = des_.threads_;
+      des_.threads_ = obj;
+
+      return rc_flag;
+}
+
+bool dll_target::proc_contribution(const NetContribution*net)
+{
+      assert(stmt_cur_);
+      assert(stmt_cur_->type_ == IVL_ST_NONE);
+      FILE_NAME(stmt_cur_, net);
+
+      stmt_cur_->type_ = IVL_ST_CONTRIB;
+
+      assert(expr_ == 0);
+      net->lval()->expr_scan(this);
+      stmt_cur_->u_.contrib_.lval = expr_;
+      expr_ = 0;
+
+      net->rval()->expr_scan(this);
+      stmt_cur_->u_.contrib_.rval = expr_;
+      expr_ = 0;
+
+      return true;
+}

t-dll-api.cc

@@ -1478,6 +1478,11 @@ extern "C" ivl_process_type_t ivl_process_type(ivl_process_t net)
       return net->type_;
 }
 
+extern "C" int ivl_process_analog(ivl_process_t net)
+{
+      return net->analog_flag != 0;
+}
+
 extern "C" ivl_scope_t ivl_process_scope(ivl_process_t net)
 {
       return net->scope_;
@@ -2112,6 +2117,17 @@ extern "C" ivl_event_t ivl_stmt_events(ivl_statement_t net, unsigned idx)
       return 0;
 }
 
+extern "C" ivl_expr_t ivl_stmt_lexp(ivl_statement_t net)
+{
+      switch (net->type_) {
+	  case IVL_ST_CONTRIB:
+	    return net->u_.contrib_.lval;
+	  default:
+	    assert(0);
+      }
+      return 0;
+}
+
 extern "C" ivl_lval_t ivl_stmt_lval(ivl_statement_t net, unsigned idx)
 {
       switch (net->type_) {
@@ -2225,6 +2241,8 @@ extern "C" ivl_expr_t ivl_stmt_rval(ivl_statement_t net)
 	  case IVL_ST_CASSIGN:
 	  case IVL_ST_FORCE:
 	    return net->u_.assign_.rval_;
+	  case IVL_ST_CONTRIB:
+	    return net->u_.contrib_.rval;
 	  default:
 	    assert(0);
       }

t-dll-proc.cc

@@ -40,6 +40,7 @@ bool dll_target::process(const NetProcTop*net)
 	    calloc(1, sizeof(struct ivl_process_s));
 
       obj->type_ = net->type();
+      obj->analog_flag = 0;
 
       FILE_NAME(obj, net);
 

t-dll.h

@@ -102,6 +102,7 @@ struct dll_target  : public target_t, public expr_scan_t {
       bool sign_extend(const NetSignExtend*);
 
       bool process(const NetProcTop*);
+      bool process(const NetAnalogTop*);
       void scope(const NetScope*);
       void signal(const NetNet*);
       bool signal_paths(const NetNet*);
@@ -122,6 +123,7 @@ struct dll_target  : public target_t, public expr_scan_t {
       void proc_case(const NetCase*);
       bool proc_cassign(const NetCAssign*);
       bool proc_condit(const NetCondit*);
+      bool proc_contribution(const NetContribution*);
       bool proc_deassign(const NetDeassign*);
       bool proc_delay(const NetPDelay*);
       bool proc_disable(const NetDisable*);
@@ -553,7 +555,8 @@ struct ivl_parameter_s {
  * that generally only matters for VPI calls.
  */
 struct ivl_process_s {
-      ivl_process_type_t type_;
+      ivl_process_type_t type_ : 2;
+      int analog_flag          : 1;
       ivl_scope_t scope_;
       ivl_statement_t stmt_;
       perm_string file;
@@ -707,6 +710,11 @@ struct ivl_statement_s {
 		  struct ivl_statement_s*stmt_;
 	    } condit_;
 
+	    struct { /* IVL_ST_CONTRIB */
+		  ivl_expr_t lval;
+		  ivl_expr_t rval;
+	    } contrib_;
+
 	    struct { /* IVL_ST_DELAY */
 		  uint64_t delay_;
 		  ivl_statement_t stmt_;

target.cc

@@ -240,7 +240,16 @@ bool target_t::sign_extend(const NetSignExtend*net)
 
 bool target_t::process(const NetProcTop*top)
 {
-      return top->statement()->emit_proc(this);
+      cerr << "target (" << typeid(*this).name() <<  "): "
+	    "Unhandled process(NetProcTop)." << endl;
+      return false;
+}
+
+bool target_t::process(const NetAnalogTop*top)
+{
+      cerr << "target (" << typeid(*this).name() <<  "): "
+	    "Unhandled process(NetAnalogTop)." << endl;
+      return false;
 }
 
 void target_t::proc_alloc(const NetAlloc*)
@@ -292,6 +301,14 @@ bool target_t::proc_condit(const NetCondit*condit)
       return false;
 }
 
+bool target_t::proc_contribution(const NetContribution*net)
+{
+      cerr << "target (" << typeid(*this).name() <<  "): "
+	    "Unhandled contribution:" << endl;
+      net->dump(cerr, 6);
+      return false;
+}
+
 bool target_t::proc_deassign(const NetDeassign*dev)
 {
       cerr << dev->get_fileline() << ": internal error: "

target.h

@@ -103,6 +103,7 @@ struct target_t {
 	/* Output a process (called for each process). It is up to the
 	   target to recurse if desired. */
       virtual bool process(const NetProcTop*);
+      virtual bool process(const NetAnalogTop*);
 
 	/* Various kinds of process nodes are dispatched through these. */
       virtual void proc_alloc(const NetAlloc*);
@@ -112,6 +113,7 @@ struct target_t {
       virtual void proc_case(const NetCase*);
       virtual bool proc_cassign(const NetCAssign*);
       virtual bool proc_condit(const NetCondit*);
+      virtual bool proc_contribution(const NetContribution*);
       virtual bool proc_deassign(const NetDeassign*);
       virtual bool proc_delay(const NetPDelay*);
       virtual bool proc_disable(const NetDisable*);

tgt-stub/statement.c

@@ -287,6 +287,12 @@ void show_statement(ivl_statement_t net, unsigned ind)
 		break;
 	  }
 
+	  case IVL_ST_CONTRIB:
+	    fprintf(out, "%*sCONTRIBUTION ( <+ )\n", ind, "");
+	    show_expression(ivl_stmt_lexp(net), ind+4);
+	    show_expression(ivl_stmt_rval(net), ind+4);
+	    break;
+
 	  case IVL_ST_DEASSIGN:
 	    fprintf(out, "%*sDEASSIGN <lwidth=%u>\n", ind, "",
 		    ivl_stmt_lwidth(net));

tgt-stub/stub.c

@@ -999,9 +999,15 @@ static int show_process(ivl_process_t net, void*x)
 
       switch (ivl_process_type(net)) {
 	  case IVL_PR_INITIAL:
+	    if (ivl_process_analog(net))
+		  fprintf(out, "analog initial\n");
+	    else
 		  fprintf(out, "initial\n");
 	    break;
 	  case IVL_PR_ALWAYS:
+	    if (ivl_process_analog(net))
+		  fprintf(out, "analog\n");
+	    else
 		  fprintf(out, "always\n");
 	    break;
       }