Add support for passing array words to system tasks.

Array words don't have a vpiHandle with a label, so the %vpi_call
needs a special syntac for arguments that reference array words.
This syntax creates an array word reference that persists and can
be used at a VPI object by system tasks.

tgt-vvp/draw_vpi.c

@@ -72,9 +72,14 @@ static void draw_vpi_taskfunc_args(const char*call_string,
       unsigned parm_count = tnet
 	    ? ivl_stmt_parm_count(tnet)
 	    : ivl_expr_parms(fnet);
-      struct vector_info *vec = 0x0;
+
-      unsigned int vecs= 0;
+      struct args_info {
-      unsigned int veci= 0;
+	    char*text;
+	    int vec_flag; /* True if the vec must be released. */
+	    struct vector_info vec;
+      } *args = calloc(parm_count, sizeof(struct args_info));
+
+      char buffer[4096];
 
       ivl_parameter_t par;
 
@@ -92,17 +97,56 @@ static void draw_vpi_taskfunc_args(const char*call_string,
 		       with VPI handles of their own. Therefore, skip
 		       them in the process of evaluating expressions. */
 		case IVL_EX_NONE:
+		  args[idx].text = strdup("\" \"");
+		  continue;
+
 		case IVL_EX_ARRAY:
-		case IVL_EX_NUMBER:
+		  snprintf(buffer, sizeof buffer,
+			   "v%p", ivl_expr_signal(expr));
+		  args[idx].text = strdup(buffer);
+		  continue;
+
+		case IVL_EX_NUMBER: {
+		      unsigned bit, wid = ivl_expr_width(expr);
+		      const char*bits = ivl_expr_bits(expr);
+		      char*dp;
+
+		      snprintf(buffer, sizeof buffer,
+			       "%u'%sb", wid, ivl_expr_signed(expr)? "s" : "");
+		      dp = buffer + strlen(buffer);
+		      for (bit = wid ;  bit > 0 ;  bit -= 1)
+			    *dp++ = bits[bit-1];
+		      *dp++ = 0;
+		      assert(dp - buffer <= sizeof buffer);
+		      args[idx].text = strdup(buffer);
+		      continue;
+		}
+
 		case IVL_EX_STRING:
+		  if (( par = ivl_expr_parameter(expr) )) {
+			snprintf(buffer, sizeof buffer, "P_%p", par);
+
+		  } else {
+			snprintf(buffer, sizeof buffer, "\"%s\"", ivl_expr_string(expr));
+		  }
+		  args[idx].text = strdup(buffer);
+		  continue;
+
 		case IVL_EX_EVENT:
+		  snprintf(buffer, sizeof buffer, "E_%p", ivl_expr_event(expr));
+		  args[idx].text = strdup(buffer);
+		  continue;
 		case IVL_EX_SCOPE:
+		  snprintf(buffer, sizeof buffer, "S_%p", ivl_expr_scope(expr));
+		  args[idx].text = strdup(buffer);
 		  continue;
 
 		case IVL_EX_SFUNC:
-		  if (is_magic_sfunc(ivl_expr_name(expr)))
+		  if (is_magic_sfunc(ivl_expr_name(expr))) {
+			snprintf(buffer, sizeof buffer, "%s", ivl_expr_name(expr));
+			args[idx].text = strdup(buffer);
 			continue;
-
+		  }
 		  break;
 
 		case IVL_EX_SIGNAL:
@@ -125,21 +169,47 @@ static void draw_vpi_taskfunc_args(const char*call_string,
 		  } else if (ivl_expr_signed(expr) !=
 			     ivl_signal_signed(ivl_expr_signal(expr))) {
 			break;
-		  } else if (! is_fixed_memory_word(expr)){
+		  } else if (is_fixed_memory_word(expr)) {
-			break;
+			  /* This is a word of a non-array, or a word
-		  } else {
+			     of a net array, so we can address the
-			  /* Some array selects need to be evaluated. */
+			     word directly. */
+			ivl_signal_t sig = ivl_expr_signal(expr);
+			unsigned use_word = 0;
 			ivl_expr_t word_ex = ivl_expr_oper1(expr);
-			if (word_ex && !number_is_immediate(word_ex,
+			if (word_ex) {
-			                  8*sizeof(unsigned))) {
+			        /* Some array select have been evaluated. */
+			      if (number_is_immediate(word_ex, 8*sizeof(unsigned))) {
+				    use_word = get_number_immediate(word_ex);
+				    word_ex = 0;
+			      }
+			}
+			if (word_ex)
 			      break;
-			}
+
+			assert(word_ex == 0);
+			snprintf(buffer, sizeof buffer, "v%p_%u", sig, use_word);
+			args[idx].text = strdup(buffer);
 			continue;
+
+		  } else {
+			  /* What's left, this is the work of a var
+			     array. Create the right code to handle
+			     it. */
+			ivl_signal_t sig = ivl_expr_signal(expr);
+			unsigned use_word = 0;
+			ivl_expr_t word_ex = ivl_expr_oper1(expr);
+			if (word_ex) {
+			        /* Some array select have been evaluated. */
+			      if (number_is_immediate(word_ex, 8*sizeof(unsigned))) {
+				    use_word = get_number_immediate(word_ex);
+				    word_ex = 0;
 			      }
+			}
+			if (word_ex)
+			      break;
 
-
+			snprintf(buffer, sizeof buffer, "&A<v%p, %u>", sig, use_word);
-		case IVL_EX_MEMORY:
+			args[idx].text = strdup(buffer);
-		  if (!ivl_expr_oper1(expr)) {
 			continue;
 		  }
 
@@ -149,143 +219,43 @@ static void draw_vpi_taskfunc_args(const char*call_string,
 		  break;
 	    }
 
-	    vec = (struct vector_info *)
-		  realloc(vec, (vecs+1)*sizeof(struct vector_info));
-
 	    switch (ivl_expr_value(expr)) {
 		case IVL_VT_LOGIC:
 		case IVL_VT_BOOL:
-		  vec[vecs] = draw_eval_expr(expr, 0);
+		  args[idx].vec_flag = 1;
+		  args[idx].vec = draw_eval_expr(expr, 0);
+		  snprintf(buffer, sizeof buffer,
+			   "T<%u,%u,%s>", args[idx].vec.base, args[idx].vec.wid,
+			   ivl_expr_signed(expr)? "s" : "u");
 		  break;
 		case IVL_VT_REAL:
-		  vec[vecs].base = draw_eval_real(expr);
+		  args[idx].vec_flag = 1;
-		  vec[vecs].wid = 0;
+		  args[idx].vec.base = draw_eval_real(expr);
+		  args[idx].vec.wid  = 0;
+		  snprintf(buffer, sizeof buffer,
+			   "W<%u,r>", args[idx].vec.base);
 		  break;
 		default:
 		  assert(0);
 	    }
-	    vecs++;
+	    args[idx].text = strdup(buffer);
       }
 
       fprintf(vvp_out, "%s", call_string);
 
       for (idx = 0 ;  idx < parm_count ;  idx += 1) {
-	    ivl_expr_t expr = tnet
-		  ? ivl_stmt_parm(tnet, idx)
-		  : ivl_expr_parm(fnet, idx);
 
-	    switch (ivl_expr_type(expr)) {
+	    fprintf(vvp_out, ", %s", args[idx].text);
-		case IVL_EX_NONE:
+	    free(args[idx].text);
-		  fprintf(vvp_out, ", \" \"");
+	    if (args[idx].vec_flag) {
-		  continue;
+		  if (args[idx].vec.wid > 0)
-
+			clr_vector(args[idx].vec);
-		case IVL_EX_ARRAY:
+		  else
-		  fprintf(vvp_out, ", v%p", ivl_expr_signal(expr));
+			clr_word(args[idx].vec.base);
-		  continue;
+	    }
-
-		case IVL_EX_NUMBER: {
-		      unsigned bit, wid = ivl_expr_width(expr);
-		      const char*bits = ivl_expr_bits(expr);
-
-		      fprintf(vvp_out, ", %u'%sb", wid,
-			      ivl_expr_signed(expr)? "s" : "");
-		      for (bit = wid ;  bit > 0 ;  bit -= 1)
-			    fputc(bits[bit-1], vvp_out);
-		      continue;
       }
 
-		case IVL_EX_SIGNAL:
+      free(args);
-		    /* If this is a part select, then the value was
-		       calculated above. Otherwise, just pass the
-		       signal. */
-		  if (ivl_expr_width(expr) !=
-		      ivl_signal_width(ivl_expr_signal(expr))) {
-			break;
-
-		  } else if (ivl_expr_signed(expr) !=
-			     ivl_signal_signed(ivl_expr_signal(expr))) {
-			break;
-
-		  } else if (! is_fixed_memory_word(expr)){
-			break;
-
-		  } else {
-			ivl_signal_t sig = ivl_expr_signal(expr);
-			unsigned use_word = 0;
-			ivl_expr_t word_ex = ivl_expr_oper1(expr);
-			if (word_ex) {
-			        /* Some array select have been evaluated. */
-			      if (!number_is_immediate(word_ex,
-			             8*sizeof(unsigned))) {
-			            break;
-			      }
-			      use_word = get_number_immediate(word_ex);
-			}
-			fprintf(vvp_out, ", v%p_%u", sig, use_word);
-			continue;
-		  }
-		  assert(0);
-		  continue;
-
-		case IVL_EX_STRING:
-		  if (( par = ivl_expr_parameter(expr) )) {
-			fprintf(vvp_out, ", P_%p", par);
-
-		  } else {
-			fprintf(vvp_out, ", \"%s\"",
-				ivl_expr_string(expr));
-		  }
-		  continue;
-
-		case IVL_EX_EVENT:
-		  fprintf(vvp_out, ", E_%p", ivl_expr_event(expr));
-		  continue;
-
-		case IVL_EX_SCOPE:
-		  fprintf(vvp_out, ", S_%p", ivl_expr_scope(expr));
-		  continue;
-
-		case IVL_EX_SFUNC:
-		  if (is_magic_sfunc(ivl_expr_name(expr))) {
-			fprintf(vvp_out, ", %s", ivl_expr_name(expr));
-			continue;
-		  }
-		  break;
-
-		default:
-		  break;
-	    }
-	    assert(veci < vecs);
-
-	    switch (ivl_expr_value(expr)) {
-
-		case IVL_VT_LOGIC:
-		case IVL_VT_BOOL:
-		  fprintf(vvp_out, ", T<%u,%u,%s>", vec[veci].base,
-			  vec[veci].wid, ivl_expr_signed(expr)? "s" : "u");
-		  break;
-
-		case IVL_VT_REAL:
-		  fprintf(vvp_out, ", W<%u,r>", vec[veci].base);
-		  break;
-
-		default:
-		  assert(0);
-	    }
-	    veci++;
-      }
-
-      assert(veci == vecs);
-
-      if (vecs) {
-	    for (idx = 0; idx < vecs; idx++) {
-		  if (vec[idx].wid > 0)
-			clr_vector(vec[idx]);
-		  else if (vec[idx].wid == 0)
-			clr_word(vec[idx].base);
-	    }
-	    free(vec);
-      }
 
       fprintf(vvp_out, ";\n");
 }

vvp/array.cc

@@ -77,6 +77,12 @@ struct __vpiArrayIndex {
       unsigned done;
 };
 
+struct __vpiArrayVthrA {
+      struct __vpiHandle base;
+      struct __vpiArray*array;
+      unsigned address;
+};
+
 /*
  * The vpiArrayWord is magic. It is used as the handle to return when
  * vpi code tries to index or scan an array of variable words. The
@@ -117,6 +123,10 @@ static int vpi_array_var_word_get(int code, vpiHandle);
 static void vpi_array_var_word_get_value(vpiHandle, p_vpi_value);
 static vpiHandle vpi_array_var_word_put_value(vpiHandle, p_vpi_value, int);
 
+static int vpi_array_vthr_A_get(int code, vpiHandle);
+static void vpi_array_vthr_A_get_value(vpiHandle, p_vpi_value);
+static vpiHandle vpi_array_vthr_A_put_value(vpiHandle, p_vpi_value, int);
+
 static const struct __vpirt vpip_arraymem_rt = {
       vpiMemory,
       vpi_array_get,
@@ -167,12 +177,27 @@ static const struct __vpirt vpip_array_var_word_rt = {
       0
 };
 
+static const struct __vpirt vpip_array_vthr_A_rt = {
+      vpiMemoryWord,
+      &vpi_array_vthr_A_get,
+      0,
+      &vpi_array_vthr_A_get_value,
+      &vpi_array_vthr_A_put_value,
+      0,
+      0,
+      0,
+      0
+};
+
 # define ARRAY_HANDLE(ref) (assert(ref->vpi_type->type_code==vpiMemory), \
 			    (struct __vpiArray*)ref)
 
 # define ARRAY_VAR_WORD(ref) (assert(ref->vpi_type->type_code==vpiMemoryWord), \
 			      (struct __vpiArrayWord*)ref)
 
+# define ARRAY_VTHR_A_HANDLE(ref) (assert(ref->vpi_type->type_code==vpiMemoryWord), \
+			    (struct __vpiArrayVthrA*)ref)
+
 static void array_make_vals_words(struct __vpiArray*parent)
 {
       assert(parent->vals_words == 0);
@@ -399,6 +424,53 @@ static int array_index_free_object(vpiHandle ref)
       return 1;
 }
 
+static int vpi_array_vthr_A_get(int code, vpiHandle ref)
+{
+      struct __vpiArrayVthrA*obj = ARRAY_VTHR_A_HANDLE(ref);
+      struct __vpiArray*parent = obj->array;
+
+      switch (code) {
+	  case vpiLineNo:
+	    return 0; // Not implemented for now!
+
+	  case vpiSize:
+	    assert(parent->vals);
+	    return parent->vals_width;
+
+	  default:
+	    return 0;
+      }
+}
+static void vpi_array_vthr_A_get_value(vpiHandle ref, p_vpi_value value)
+{
+      struct __vpiArrayVthrA*obj = ARRAY_VTHR_A_HANDLE(ref);
+      struct __vpiArray*parent = obj->array;
+
+      assert(parent);
+      assert(parent->vals);
+      assert(obj->address < parent->array_count);
+
+      vpip_vec4_get_value(parent->vals[obj->address],
+			  parent->vals_width, false, value);
+}
+
+static vpiHandle vpi_array_vthr_A_put_value(vpiHandle ref, p_vpi_value vp, int)
+{
+      struct __vpiArrayVthrA*obj = ARRAY_VTHR_A_HANDLE(ref);
+      struct __vpiArray*parent = obj->array;
+
+      unsigned index = obj->address;
+
+      assert(parent);
+      assert(obj->address < parent->array_count);
+
+      vvp_vector4_t val = vec4_from_vpi_value(vp, parent->vals_width);
+      array_set_word(parent, index, 0, val);
+
+      return ref;
+}
+
+
 void array_set_word(vvp_array_t arr,
 		    unsigned address,
 		    unsigned part_off,
@@ -773,3 +845,19 @@ void compile_array_alias(char*label, char*name, char*src)
       free(name);
       free(src);
 }
+
+vpiHandle vpip_make_vthr_A(char*label, unsigned addr)
+{
+      struct __vpiArrayVthrA*obj = (struct __vpiArrayVthrA*)
+	    malloc(sizeof (struct __vpiArrayVthrA));
+
+      obj->base.vpi_type = &vpip_array_vthr_A_rt;
+
+      obj->array = array_find(label);
+      assert(obj->array);
+
+      obj->address = addr;
+      assert(addr < obj->array->array_count);
+
+      return &(obj->base);
+}

vvp/lexor.lex

@@ -190,6 +190,7 @@
       return T_NUMBER; }
 
 
+"&A" { return K_A; }
 
   /* Handle some specialized constant/literals as symbols. */
 

vvp/parse.y

@@ -65,7 +65,7 @@ static struct __vpiModPath*modpath_dst = 0;
       vvp_delay_t*cdelay;
 };
 
-%token K_ALIAS K_ALIAS_S K_ALIAS_R
+%token K_A K_ALIAS K_ALIAS_S K_ALIAS_R
 %token K_ARITH_ABS K_ARITH_DIV K_ARITH_DIV_R K_ARITH_DIV_S K_ARITH_MOD
 %token K_ARITH_MOD_R
 %token K_ARITH_MULT K_ARITH_MULT_R K_ARITH_SUB K_ARITH_SUB_R
@@ -797,6 +797,8 @@ argument
       { $$ = vpip_make_binary_const($1.idx, $1.text);
 	free($1.text);
       }
+  | K_A '<' T_SYMBOL ',' T_NUMBER '>'
+      { $$ = vpip_make_vthr_A($3, $5); }
   ;
 
 

vvp/vpi_priv.h

@@ -433,6 +433,8 @@ vpiHandle vpip_make_vthr_vector(unsigned base, unsigned wid, bool signed_flag);
 
 vpiHandle vpip_make_vthr_word(unsigned base, const char*type);
 
+vpiHandle vpip_make_vthr_A(char*symbol, unsigned index);
+
 /*
  * This function is called before any compilation to load VPI
  * modules. This gives the modules a chance to announce their