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A vpiBitVar can have a non-zero LSB and can be unsigned. 

The general bit variable can be either signed or unsigned and can
have a non-zero LSB.
This commit is contained in:
Cary R 2011-09-05 16:10:08 -07:00 committed by Stephen Williams
parent 4f8cace5a9
commit 9fb317a4e1
4 changed files with 35 additions and 27 deletions
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4
vvp/parse.y
View File

@ -682,10 +682,10 @@ statement
| T_LABEL K_VAR_I local_flag T_STRING ',' T_NUMBER T_NUMBER ';'
{ compile_variable($1, $4, $6, $7, vpiIntegerVar, true, $3); }
| T_LABEL K_VAR_2S local_flag T_STRING ',' T_NUMBER T_NUMBER ';'
| T_LABEL K_VAR_2S local_flag T_STRING ',' signed_t_number signed_t_number ';'
{ compile_variable($1, $4, $6, $7, vpiIntVar, true, $3); }
| T_LABEL K_VAR_2U local_flag T_STRING ',' T_NUMBER T_NUMBER ';'
| T_LABEL K_VAR_2U local_flag T_STRING ',' signed_t_number signed_t_number ';'
{ compile_variable($1, $4, $6, $7, vpiIntVar, false, $3); }
| T_LABEL K_VAR_R T_STRING ',' signed_t_number signed_t_number ';'

2
vvp/vpi_priv.h
View File

@ -263,7 +263,7 @@ extern unsigned vpip_size(__vpiSignal *sig);
extern struct __vpiScope* vpip_scope(__vpiSignal*sig);
extern vpiHandle vpip_make_int2(const char*name, int msb, int lsb,
vvp_net_t*vec);
bool signed_flag, vvp_net_t*vec);
extern vpiHandle vpip_make_int4(const char*name, int msb, int lsb,
vvp_net_t*vec);
extern vpiHandle vpip_make_var4(const char*name, int msb, int lsb,

52
vvp/vpi_signal.cc
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2001-2010 Stephen Williams (steve@icarus.com)
* Copyright (c) 2001-2011 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
@ -996,31 +996,39 @@ vpiHandle vpip_make_int4(const char*name, int msb, int lsb, vvp_net_t*vec)
}
/*
* Construct a vpi
* Construct the two-state SystemVerilog variables.
*/
vpiHandle vpip_make_int2(const char*name, int msb, int lsb, vvp_net_t*vec)
vpiHandle vpip_make_int2(const char*name, int msb, int lsb, bool signed_flag,
vvp_net_t*vec)
{
vpiHandle obj = vpip_make_net4(name, msb,lsb, true, vec);
vpiHandle obj = vpip_make_net4(name, msb, lsb, signed_flag, vec);
assert(lsb == 0);
switch (msb) {
case 7:
obj->vpi_type = &vpip_byte_rt;
break;
case 15:
obj->vpi_type = &vpip_shortint_rt;
break;
case 31:
obj->vpi_type = &vpip_int_rt;
break;
case 63:
obj->vpi_type = &vpip_longint_rt;
break;
default:
// Every other type of bit vector is a vpiBitVar with
// array dimensions.
// All unsigned 2-state variables are a vpiBitVar. All 2-state
// variables with a non-zero lsb are also a vpiBitVar.
if ((! signed_flag) || (lsb != 0) ) {
obj->vpi_type = &vpip_bitvar_rt;
break;
} else {
// These could also be bit declarations with matching
// information, but for now they get the apparent type.
switch (msb) {
case 7:
obj->vpi_type = &vpip_byte_rt;
break;
case 15:
obj->vpi_type = &vpip_shortint_rt;
break;
case 31:
obj->vpi_type = &vpip_int_rt;
break;
case 63:
obj->vpi_type = &vpip_longint_rt;
break;
default:
// Every other type of bit vector is a vpiBitVar with
// array dimensions.
obj->vpi_type = &vpip_bitvar_rt;
break;
}
}
return obj;

4
vvp/words.cc
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2003-2010 Stephen Williams (steve@icarus.com)
* Copyright (c) 2003-2011 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
@ -117,7 +117,7 @@ void compile_variable(char*label, char*name,
obj = vpip_make_int4(name, msb, lsb, net);
break;
case vpiIntVar: // This handles all the atom2 int types
obj = vpip_make_int2(name, msb, lsb, net);
obj = vpip_make_int2(name, msb, lsb, signed_flag, net);
break;
default:
fprintf(stderr, "internal error: %s: vpi_type_code=%d\n", name, vpi_type_code);