/*
* Icarus translated for(<assign>; <cond>; <incr_assign>) <body> into
*
* begin
* <assign>;
* while (<cond>) begin
* <body>
* <incr_assign>
* end
* end
* This routine looks for this pattern and turns it back into the
* appropriate for loop.
*/
static unsigned is_for_loop(ivl_scope_t scope, ivl_statement_t stmt)
{
unsigned wid;
ivl_statement_t assign, while_lp, while_blk, body, incr_assign;
/* We must have two block elements. */
if (ivl_stmt_block_count(stmt) != 2) return 0;
/* The first must be an assign. */
assign = ivl_stmt_block_stmt(stmt, 0);
if (ivl_statement_type(assign) != IVL_ST_ASSIGN) return 0;
/* The second must be a while. */
while_lp = ivl_stmt_block_stmt(stmt, 1);
if (ivl_statement_type(while_lp) != IVL_ST_WHILE) return 0;
/* The while statement must be a block. */
while_blk = ivl_stmt_sub_stmt(while_lp);
if (ivl_statement_type(while_blk) != IVL_ST_BLOCK) return 0;
/* It must not be a named block. */
if (ivl_stmt_block_scope(while_blk)) return 0;
/* It must have two elements. */
if (ivl_stmt_block_count(while_blk) != 2) return 0;
/* The first block element (the body) can be anything. */
body = ivl_stmt_block_stmt(while_blk, 0);
/* The second block element must be the increment assign. */
incr_assign = ivl_stmt_block_stmt(while_blk, 1);
if (ivl_statement_type(incr_assign) != IVL_ST_ASSIGN) return 0;
/* And finally the for statements must have the same line number
* as the block. */
if ((ivl_stmt_lineno(stmt) != ivl_stmt_lineno(assign)) ||
(ivl_stmt_lineno(stmt) != ivl_stmt_lineno(while_lp)) ||
(ivl_stmt_lineno(stmt) != ivl_stmt_lineno(while_blk)) ||
(ivl_stmt_lineno(stmt) != ivl_stmt_lineno(incr_assign))) {
return 0;
}
/* The pattern matched so generate the appropriate code. */
fprintf(vlog_out, "%*cfor(", get_indent(), ' ');
/* Emit the initialization statement. */
// HERE: Do we need to calculate the width? The compiler should have already
// done this for us.
wid = emit_stmt_lval(scope, assign);
fprintf(vlog_out, " = ");
emit_expr(scope, ivl_stmt_rval(assign), wid);
fprintf(vlog_out, "; ");
/* Emit the condition. */
emit_expr(scope, ivl_stmt_cond_expr(while_lp), 0);
fprintf(vlog_out, "; ");
/* Emit in increment statement. */
// HERE: Do we need to calculate the width? The compiler should have already
// done this for us.
wid = emit_stmt_lval(scope, incr_assign);
fprintf(vlog_out, " = ");
emit_expr(scope, ivl_stmt_rval(incr_assign), wid);
fprintf(vlog_out, ")");
emit_stmt_file_line(stmt);
/* Now emit the body. */
single_indent = 1;
emit_stmt(scope, body);
return 1;
}
void emit_process(ivl_scope_t scope, ivl_process_t proc)
{
ivl_statement_t stmt;
fprintf(vlog_out, "\n%*c", get_indent(), ' ');
switch (ivl_process_type(proc)) {
case IVL_PR_INITIAL:
fprintf(vlog_out, "initial");
break;
case IVL_PR_ALWAYS:
fprintf(vlog_out, "always");
break;
default:
fprintf(vlog_out, "<unknown>");
fprintf(stderr, "%s:%u: vlog95 error: Unknown process type (%d).\n",
ivl_process_file(proc), ivl_process_lineno(proc),
(int)ivl_process_type(proc));
vlog_errors+= 1;
break;
}
if (emit_file_line) {
fprintf(vlog_out, " /* %s:%u */",
ivl_process_file(proc),
ivl_process_lineno(proc));
}
stmt = ivl_process_stmt(proc);
if (ivl_statement_type(stmt) == IVL_ST_NOOP) {
fprintf(vlog_out, " begin\n%*cend\n", get_indent(), ' ');
} else {
single_indent = 1;
emit_stmt(scope, stmt);
}
}
/*
* Icarus translated wait(<expr) <stmt> into
* begin
* while (<expr> !== 1'b1) @(<expr sensitivities>);
* <stmt>
* end
* This routine looks for this pattern and turns it back into a
* wait statement.
*/
static unsigned is_wait(ivl_scope_t scope, ivl_statement_t stmt)
{
ivl_statement_t while_wait, wait, wait_stmt;
ivl_expr_t while_expr, expr;
const char *bits;
/* We must have two block elements. */
if (ivl_stmt_block_count(stmt) != 2) return 0;
/* The first must be a while. */
while_wait = ivl_stmt_block_stmt(stmt, 0);
if (ivl_statement_type(while_wait) != IVL_ST_WHILE) return 0;
/* That has a wait with a NOOP statement. */
wait = ivl_stmt_sub_stmt(while_wait);
if (ivl_statement_type(wait) != IVL_ST_WAIT) return 0;
wait_stmt = ivl_stmt_sub_stmt(wait);
if (ivl_statement_type(wait_stmt) != IVL_ST_NOOP) return 0;
/* Check that the while condition has the correct form. */
while_expr = ivl_stmt_cond_expr(while_wait);
if (ivl_expr_type(while_expr) != IVL_EX_BINARY) return 0;
if (ivl_expr_opcode(while_expr) != 'N') return 0;
/* Has a second operator that is a constant 1'b1. */
expr = ivl_expr_oper2(while_expr);
if (ivl_expr_type(expr) != IVL_EX_NUMBER) return 0;
if (ivl_expr_width(expr) != 1) return 0;
bits = ivl_expr_bits(expr);
if (*bits != '1') return 0;
// HERE: There is no easy way to verify that the @ sensitivity list
// matches the first expression so we don't check for that yet.
/* And finally the two statements that represent the wait must
* have the same line number as the block. */
if ((ivl_stmt_lineno(stmt) != ivl_stmt_lineno(while_wait)) ||
(ivl_stmt_lineno(stmt) != ivl_stmt_lineno(wait))) {
return 0;
}
/* The pattern matched so generate the appropriate code. */
fprintf(vlog_out, "%*cwait(", get_indent(), ' ');
emit_expr(scope, ivl_expr_oper1(while_expr), 0);
fprintf(vlog_out, ")");
emit_stmt_file_line(stmt);
single_indent = 1;
emit_stmt(scope, ivl_stmt_block_stmt(stmt, 1));
return 1;
}
static void emit_stmt_case(ivl_scope_t scope, ivl_statement_t stmt)
{
char *case_type;
unsigned idx, default_case, count = ivl_stmt_case_count(stmt);
switch(ivl_statement_type(stmt)) {
case IVL_ST_CASE:
case IVL_ST_CASER:
case_type = "case";
break;
case IVL_ST_CASEX:
case_type = "casex";
break;
case IVL_ST_CASEZ:
case_type = "casez";
break;
default:
assert(0);
}
fprintf(vlog_out, "%*c%s (", get_indent(), ' ', case_type);
emit_expr(scope, ivl_stmt_cond_expr(stmt), 0);
fprintf(vlog_out, ")");
emit_stmt_file_line(stmt);
fprintf(vlog_out, "\n");
indent += indent_incr;
default_case = count;
for (idx = 0; idx < count; idx += 1) {
ivl_expr_t expr = ivl_stmt_case_expr(stmt, idx);
/* This is the default case so emit it last. */
if (expr == 0) {
assert(default_case == count);
default_case = idx;
continue;
}
fprintf(vlog_out, "%*c", get_indent(), ' ');
emit_expr(scope, expr, 0);
fprintf(vlog_out, ":");
single_indent = 1;
emit_stmt(scope, ivl_stmt_case_stmt(stmt, idx));
}
if (default_case < count) {
fprintf(vlog_out, "%*cdefault:", get_indent(), ' ');
single_indent = 1;
emit_stmt(scope, ivl_stmt_case_stmt(stmt, default_case));
}
assert(indent >= indent_incr);
indent -= indent_incr;
fprintf(vlog_out, "%*cendcase\n", get_indent(), ' ');
}
static void emit_stmt_condit(ivl_scope_t scope, ivl_statement_t stmt)
{
ivl_statement_t true_stmt = ivl_stmt_cond_true(stmt);
ivl_statement_t false_stmt = ivl_stmt_cond_false(stmt);
unsigned nest = 0;
fprintf(vlog_out, "%*cif (", get_indent(), ' ');
emit_expr(scope, ivl_stmt_cond_expr(stmt), 0);
fprintf(vlog_out, ")");
emit_stmt_file_line(stmt);
if (true_stmt) {
/* If we have a false statement and the true statement is a
* condition that does not have a false clause then we need
* to add a begin/end pair to keep the else clause attached
* to this condition. */
if (false_stmt &&
(ivl_statement_type(true_stmt) == IVL_ST_CONDIT) &&
(! ivl_stmt_cond_false(true_stmt))) nest = 1;
if (nest) {
fprintf(vlog_out, " begin\n");
indent += indent_incr;
} else single_indent = 1;
emit_stmt(scope, true_stmt);
} else {
fprintf(vlog_out, ";\n");
}
if (false_stmt) {
if (nest) {
assert(indent >= indent_incr);
indent -= indent_incr;
}
fprintf(vlog_out, "%*c", get_indent(), ' ');
if (nest) fprintf(vlog_out, "end ");
fprintf(vlog_out, "else");
single_indent = 1;
emit_stmt(scope, false_stmt);
}
}
void clsAnalysis::AnalyzeStatement(clsStatement * pStatement, clsBasicBlock * pBasicBlock, clsEvent * pEvent)
{
ivl_statement_t ivl_Statement;
vector<clsLValue *>::iterator it_pLValue;
vector<clsBasicBlock *>::iterator it_pBasicBlock;
unsigned int iNumberOfParameters;
unsigned int iNumberOfStatements;
unsigned int iIndex;
ivl_Statement = pStatement->m_ivl_Statement;
it_pBasicBlock = pBasicBlock->m_pSuccessors.begin();
switch (pStatement->m_Type)
{
default:
_DebugPrint("/* Unrecognized statement of type %u is encountered. */\n", ivl_statement_type(ivl_Statement) );
_Assert(0 && "Frontend Error: Unrecognized statement is encountered.");
break;
case CMODELGEN_STATEMENT_NOP:
break;
case CMODELGEN_STATEMENT_WAIT:
if (it_pBasicBlock != pBasicBlock->m_pSuccessors.end() && *it_pBasicBlock != NULL)
{
AnalyzeBasicBlock(*it_pBasicBlock, pEvent);
}
break;
case CMODELGEN_STATEMENT_CASE:
case CMODELGEN_STATEMENT_CASEZ:
case CMODELGEN_STATEMENT_CASEX:
AnalyzeExpression(pStatement->m_pExpressions[0], pEvent);
iNumberOfStatements = ivl_stmt_case_count(ivl_Statement);
for(iIndex = 0; iIndex < iNumberOfStatements; ++iIndex)
{
AnalyzeExpression(pStatement->m_pExpressions[iIndex + 1], pEvent);
if (it_pBasicBlock != pBasicBlock->m_pSuccessors.end() && *it_pBasicBlock != NULL)
{
AnalyzeBasicBlock(*it_pBasicBlock, pEvent);
}
if (it_pBasicBlock != pBasicBlock->m_pSuccessors.end() )
{
++it_pBasicBlock;
}
}
if (it_pBasicBlock != pBasicBlock->m_pSuccessors.end() && *it_pBasicBlock != NULL)
{
AnalyzeBasicBlock(*it_pBasicBlock, pEvent);
}
break;
case CMODELGEN_STATEMENT_COND:
AnalyzeExpression(pStatement->m_pExpressions[0], pEvent);
if (0 != ivl_stmt_cond_true(ivl_Statement) )
{
if (it_pBasicBlock != pBasicBlock->m_pSuccessors.end() && *it_pBasicBlock != NULL)
{
AnalyzeBasicBlock(*it_pBasicBlock, pEvent);
}
if (it_pBasicBlock != pBasicBlock->m_pSuccessors.end() )
{
++it_pBasicBlock;
}
}
if (0 != ivl_stmt_cond_false(ivl_Statement) )
{
if (it_pBasicBlock != pBasicBlock->m_pSuccessors.end() && *it_pBasicBlock != NULL)
{
AnalyzeBasicBlock(*it_pBasicBlock, pEvent);
}
if (it_pBasicBlock != pBasicBlock->m_pSuccessors.end() )
{
++it_pBasicBlock;
}
}
if (it_pBasicBlock != pBasicBlock->m_pSuccessors.end() && *it_pBasicBlock != NULL)
{
AnalyzeBasicBlock(*it_pBasicBlock, pEvent);
}
break;
case CMODELGEN_STATEMENT_REPEAT:
case CMODELGEN_STATEMENT_WHILE:
AnalyzeExpression(pStatement->m_pExpressions[0], pEvent);
if (it_pBasicBlock != pBasicBlock->m_pSuccessors.end() && *it_pBasicBlock != NULL)
{
AnalyzeBasicBlock(*it_pBasicBlock, pEvent);
}
if (it_pBasicBlock != pBasicBlock->m_pSuccessors.end() && *it_pBasicBlock != NULL)
{
AnalyzeBasicBlock(*it_pBasicBlock, pEvent);
}
break;
case CMODELGEN_STATEMENT_NB_ASSIGN:
iIndex = 0;
for (it_pLValue = pStatement->m_pLValues.begin();
it_pLValue != pStatement->m_pLValues.end();
++it_pLValue)
{
AnalyzeNBLValue(*it_pLValue, pEvent);
++iIndex;
}
AnalyzeExpression(pStatement->m_pExpressions[0], pEvent);
break;
case CMODELGEN_STATEMENT_ASSIGN:
iIndex = 0;
for (it_pLValue = pStatement->m_pLValues.begin();
it_pLValue != pStatement->m_pLValues.end();
++it_pLValue)
{
AnalyzeLValue(*it_pLValue, pEvent);
++iIndex;
}
AnalyzeExpression(pStatement->m_pExpressions[0], pEvent);
break;
case CMODELGEN_STATEMENT_STASK:
iNumberOfParameters = ivl_stmt_parm_count(ivl_Statement);
for(iIndex = 0; iIndex < iNumberOfParameters; ++iIndex)
{
AnalyzeExpression(pStatement->m_pExpressions[iIndex], pEvent);
}
break;
case CMODELGEN_STATEMENT_UTASK:
break;
case CMODELGEN_STATEMENT_DISABLE:
break;
case CMODELGEN_STATEMENT_ALLOC:
break;
case CMODELGEN_STATEMENT_FREE:
break;
}
}
static int show_stmt_case(ivl_statement_t net, ivl_scope_t sscope)
{
ivl_expr_t exp = ivl_stmt_cond_expr(net);
struct vector_info cond = draw_eval_expr(exp, 0);
unsigned count = ivl_stmt_case_count(net);
unsigned local_base = local_count;
unsigned idx, default_case;
local_count += count + 1;
/* First draw the branch table. All the non-default cases
generate a branch out of here, to the code that implements
the case. The default will fall through all the tests. */
default_case = count;
for (idx = 0 ; idx < count ; idx += 1) {
ivl_expr_t cex = ivl_stmt_case_expr(net, idx);
struct vector_info cvec;
if (cex == 0) {
default_case = idx;
continue;
}
/* Is the guard expression something I can pass to a
%cmpi/u instruction? If so, use that instead. */
if ((ivl_statement_type(net) == IVL_ST_CASE)
&& (ivl_expr_type(cex) == IVL_EX_NUMBER)
&& (! number_is_unknown(cex))
&& number_is_immediate(cex, 16)) {
unsigned long imm = get_number_immediate(cex);
fprintf(vvp_out, " %%cmpi/u %u, %lu, %u;\n",
cond.base, imm, cond.wid);
fprintf(vvp_out, " %%jmp/1 T_%d.%d, 6;\n",
thread_count, local_base+idx);
continue;
}
/* Oh well, do this case the hard way. */
cvec = draw_eval_expr_wid(cex, cond.wid, 0);
assert(cvec.wid == cond.wid);
switch (ivl_statement_type(net)) {
case IVL_ST_CASE:
fprintf(vvp_out, " %%cmp/u %u, %u, %u;\n",
cond.base, cvec.base, cond.wid);
fprintf(vvp_out, " %%jmp/1 T_%d.%d, 6;\n",
thread_count, local_base+idx);
break;
case IVL_ST_CASEX:
fprintf(vvp_out, " %%cmp/x %u, %u, %u;\n",
cond.base, cvec.base, cond.wid);
fprintf(vvp_out, " %%jmp/1 T_%d.%d, 4;\n",
thread_count, local_base+idx);
break;
case IVL_ST_CASEZ:
fprintf(vvp_out, " %%cmp/z %u, %u, %u;\n",
cond.base, cvec.base, cond.wid);
fprintf(vvp_out, " %%jmp/1 T_%d.%d, 4;\n",
thread_count, local_base+idx);
break;
default:
assert(0);
}
/* Done with the case expression */
clr_vector(cvec);
}
/* Done with the condition expression */
clr_vector(cond);
/* Emit code for the default case. */
if (default_case < count) {
ivl_statement_t cst = ivl_stmt_case_stmt(net, default_case);
show_statement(cst, sscope);
}
/* Jump to the out of the case. */
fprintf(vvp_out, " %%jmp T_%d.%d;\n", thread_count,
local_base+count);
for (idx = 0 ; idx < count ; idx += 1) {
ivl_statement_t cst = ivl_stmt_case_stmt(net, idx);
if (idx == default_case)
continue;
fprintf(vvp_out, "T_%d.%d ;\n", thread_count, local_base+idx);
clear_expression_lookaside();
show_statement(cst, sscope);
fprintf(vvp_out, " %%jmp T_%d.%d;\n", thread_count,
local_base+count);
}
/* The out of the case. */
fprintf(vvp_out, "T_%d.%d ;\n", thread_count, local_base+count);
clear_expression_lookaside();
return 0;
}
/*
* This function draws a statement as vvp assembly. It basically
* switches on the statement type and draws code based on the type and
* further specifics.
*/
static int show_statement(ivl_statement_t net, ivl_scope_t sscope)
{
const ivl_statement_type_t code = ivl_statement_type(net);
int rc = 0;
switch (code) {
case IVL_ST_ASSIGN:
rc += show_stmt_assign(net);
break;
case IVL_ST_ASSIGN_NB:
rc += show_stmt_assign_nb(net);
break;
case IVL_ST_BLOCK:
if (ivl_stmt_block_scope(net))
rc += show_stmt_block_named(net, sscope);
else
rc += show_stmt_block(net, sscope);
break;
case IVL_ST_CASE:
case IVL_ST_CASEX:
case IVL_ST_CASEZ:
rc += show_stmt_case(net, sscope);
break;
case IVL_ST_CASER:
rc += show_stmt_case_r(net, sscope);
break;
case IVL_ST_CASSIGN:
rc += show_stmt_cassign(net);
break;
case IVL_ST_CONDIT:
rc += show_stmt_condit(net, sscope);
break;
case IVL_ST_DEASSIGN:
rc += show_stmt_deassign(net);
break;
case IVL_ST_DELAY:
rc += show_stmt_delay(net, sscope);
break;
case IVL_ST_DELAYX:
rc += show_stmt_delayx(net, sscope);
break;
case IVL_ST_DISABLE:
rc += show_stmt_disable(net, sscope);
break;
case IVL_ST_FORCE:
rc += show_stmt_force(net);
break;
case IVL_ST_FOREVER:
rc += show_stmt_forever(net, sscope);
break;
case IVL_ST_FORK:
rc += show_stmt_fork(net, sscope);
break;
case IVL_ST_NOOP:
rc += show_stmt_noop(net);
break;
case IVL_ST_RELEASE:
rc += show_stmt_release(net);
break;
case IVL_ST_REPEAT:
rc += show_stmt_repeat(net, sscope);
break;
case IVL_ST_STASK:
rc += show_system_task_call(net);
break;
case IVL_ST_TRIGGER:
rc += show_stmt_trigger(net);
break;
case IVL_ST_UTASK:
rc += show_stmt_utask(net);
break;
case IVL_ST_WAIT:
rc += show_stmt_wait(net, sscope);
break;
case IVL_ST_WHILE:
rc += show_stmt_while(net, sscope);
break;
default:
fprintf(stderr, "vvp.tgt: Unable to draw statement type %u\n",
code);
rc += 1;
break;
}
return rc;
}
static void show_statement(ivl_statement_t net, unsigned ind)
{
const ivl_statement_type_t code = ivl_statement_type(net);
switch (code) {
case IVL_ST_ASSIGN:
fprintf(out, "%*s", ind, "");
show_assign_lvals(net);
fprintf(out, " = ");
show_expression(ivl_stmt_rval(net));
fprintf(out, ";\n");
break;
case IVL_ST_BLOCK: {
unsigned cnt = ivl_stmt_block_count(net);
unsigned idx;
fprintf(out, "%*sbegin\n", ind, "");
for (idx = 0 ; idx < cnt ; idx += 1) {
ivl_statement_t cur = ivl_stmt_block_stmt(net, idx);
show_statement(cur, ind+4);
}
fprintf(out, "%*send\n", ind, "");
break;
}
case IVL_ST_CONDIT: {
ivl_statement_t t = ivl_stmt_cond_true(net);
ivl_statement_t f = ivl_stmt_cond_false(net);
fprintf(out, "%*sif (", ind, "");
show_expression(ivl_stmt_cond_expr(net));
fprintf(out, ")\n");
if (t)
show_statement(t, ind+4);
else
fprintf(out, "%*s;\n", ind+4, "");
if (f) {
fprintf(out, "%*selse\n", ind, "");
show_statement(f, ind+4);
}
break;
}
case IVL_ST_DELAY:
fprintf(out, "%*s#%lu\n", ind, "", ivl_stmt_delay_val(net));
show_statement(ivl_stmt_sub_stmt(net), ind+2);
break;
case IVL_ST_NOOP:
fprintf(out, "%*s/* noop */;\n", ind, "");
break;
case IVL_ST_STASK:
if (ivl_stmt_parm_count(net) == 0) {
fprintf(out, "%*s%s;\n", ind, "", ivl_stmt_name(net));
} else {
unsigned idx;
fprintf(out, "%*s%s(", ind, "", ivl_stmt_name(net));
show_expression(ivl_stmt_parm(net, 0));
for (idx = 1 ; idx < ivl_stmt_parm_count(net) ; idx += 1) {
fprintf(out, ", ");
show_expression(ivl_stmt_parm(net, idx));
}
fprintf(out, ");\n");
}
break;
case IVL_ST_WAIT:
fprintf(out, "%*s@(...)\n", ind, "");
show_statement(ivl_stmt_sub_stmt(net), ind+2);
break;
case IVL_ST_WHILE:
fprintf(out, "%*swhile (<?>)\n", ind, "");
show_statement(ivl_stmt_sub_stmt(net), ind+2);
break;
default:
fprintf(out, "%*sunknown statement type (%d)\n", ind, "", code);
}
}
/*
* Icarus encodes a user task call with arguments as:
* begin
* <input 1> = <arg>
* ...
* <input n> = <arg>
* <task_call>
* <arg> = <output 1>
* ...
* <arg> = <output n>
* end
* This routine looks for that pattern and translates it into the
* appropriate task call. It returns true (1) if it successfully
* translated the block to a task call, otherwise it returns false
* (0) to indicate the block needs to be emitted.
*/
static unsigned is_utask_call_with_args(ivl_scope_t scope,
ivl_statement_t stmt)
{
unsigned idx, ports, task_idx = 0;
unsigned count = ivl_stmt_block_count(stmt);
unsigned lineno = ivl_stmt_lineno(stmt);
ivl_scope_t task_scope = 0;
port_expr_t port_exprs;
/* Check to see if the block is of the basic form first. */
for (idx = 0; idx < count; idx += 1) {
ivl_statement_t tmp = ivl_stmt_block_stmt(stmt, idx);
if (ivl_statement_type(tmp) == IVL_ST_ASSIGN) continue;
if (ivl_statement_type(tmp) == IVL_ST_UTASK && !task_scope) {
task_idx = idx;
task_scope = ivl_stmt_call(tmp);
assert(ivl_scope_type(task_scope) == IVL_SCT_TASK);
continue;
}
return 0;
}
/* If there is no task call or it takes no argument then return. */
if (!task_scope) return 0;
ports = ivl_scope_ports(task_scope);
if (ports == 0) return 0;
/* Allocate space to save the port information and initialize it. */
port_exprs = (port_expr_t) malloc(sizeof(struct port_expr_s)*ports);
for (idx = 0; idx < ports; idx += 1) {
port_exprs[idx].type = IVL_SIP_NONE;
port_exprs[idx].expr.rval = 0;
}
/* Check that the input arguments are correct. */
for (idx = 0; idx < task_idx; idx += 1) {
ivl_statement_t assign = ivl_stmt_block_stmt(stmt, idx);
unsigned port = utask_in_port_idx(task_scope, assign);
if ((port == ports) || (lineno != ivl_stmt_lineno(assign))) {
free(port_exprs);
return 0;
}
port_exprs[port].type = IVL_SIP_INPUT;
port_exprs[port].expr.rval = ivl_stmt_rval(assign);
}
/* Check that the output arguments are correct. */
for (idx = task_idx + 1; idx < count; idx += 1) {
ivl_statement_t assign = ivl_stmt_block_stmt(stmt, idx);
unsigned port = utask_out_port_idx(task_scope, assign);
if ((port == ports) || (lineno != ivl_stmt_lineno(assign))) {
free(port_exprs);
return 0;
}
if (port_exprs[port].type == IVL_SIP_INPUT) {
port_exprs[port].type = IVL_SIP_INOUT;
// HERE: We probably should verify that the current R-value matches the
// new L-value.
} else {
port_exprs[port].type = IVL_SIP_OUTPUT;
}
port_exprs[port].expr.lval = assign;
}
/* Check that the task call has the correct line number. */
if (lineno != ivl_stmt_lineno(ivl_stmt_block_stmt(stmt, task_idx))) {
free(port_exprs);
return 0;
}
/* Verify that all the ports were defined. */
for (idx = 0; idx < ports; idx += 1) {
if (port_exprs[idx].type == IVL_SIP_NONE) {
free(port_exprs);
return 0;
}
}
/* Now that we have the arguments figured out, print the task call. */
fprintf(vlog_out, "%*c", get_indent(), ' ');
emit_scope_path(scope, task_scope);
fprintf(vlog_out, "(");
emit_port(scope, port_exprs[0]);
for (idx = 1; idx < ports; idx += 1) {
fprintf(vlog_out, ", ");
emit_port(scope, port_exprs[idx]);
}
free(port_exprs);
fprintf(vlog_out, ");");
emit_stmt_file_line(stmt);
fprintf(vlog_out, "\n");
return 1;
}
/*
* Icarus translated <var> = repeat(<count>) <event> <value> into
* begin
* <tmp> = <value>;
* repeat(<count>) <event>;
* <var> = <tmp>;
* end
* This routine looks for this pattern and turns it back into the
* appropriate blocking assignment.
*/
static unsigned is_repeat_event_assign(ivl_scope_t scope, ivl_statement_t stmt)
{
unsigned wid;
ivl_statement_t assign, event, event_assign, repeat;
ivl_lval_t lval;
ivl_expr_t rval;
ivl_signal_t lsig, rsig;
/* We must have three block elements. */
if (ivl_stmt_block_count(stmt) != 3) return 0;
/* The first must be an assign. */
assign = ivl_stmt_block_stmt(stmt, 0);
if (ivl_statement_type(assign) != IVL_ST_ASSIGN) return 0;
/* The second must be a repeat with an event or an event. */
repeat = ivl_stmt_block_stmt(stmt, 1);
if (ivl_statement_type(repeat) != IVL_ST_REPEAT) return 0;
/* The repeat must have an event statement. */
event = ivl_stmt_sub_stmt(repeat);
if (ivl_statement_type(event) != IVL_ST_WAIT) return 0;
/* The third must be an assign. */
event_assign = ivl_stmt_block_stmt(stmt, 2);
if (ivl_statement_type(event_assign) != IVL_ST_ASSIGN) return 0;
/* The L-value must be a single signal. */
if (ivl_stmt_lvals(assign) != 1) return 0;
lval = ivl_stmt_lval(assign, 0);
/* It must not have an array select. */
if (ivl_lval_idx(lval)) return 0;
/* It must not have a non-zero base. */
if (ivl_lval_part_off(lval)) return 0;
lsig = ivl_lval_sig(lval);
/* It must not be part of the signal. */
if (ivl_lval_width(lval) != ivl_signal_width(lsig)) return 0;
/* The R-value must be a single signal. */
rval = ivl_stmt_rval(event_assign);
if (ivl_expr_type(rval) != IVL_EX_SIGNAL) return 0;
/* It must not be an array word. */
if (ivl_expr_oper1(rval)) return 0;
rsig = ivl_expr_signal(rval);
/* The two signals must be the same. */
if (lsig != rsig) return 0;
/* And finally the four statements must have the same line number
* as the block. */
if ((ivl_stmt_lineno(stmt) != ivl_stmt_lineno(assign)) ||
(ivl_stmt_lineno(stmt) != ivl_stmt_lineno(repeat)) ||
(ivl_stmt_lineno(stmt) != ivl_stmt_lineno(event)) ||
(ivl_stmt_lineno(stmt) != ivl_stmt_lineno(event_assign))) {
return 0;
}
/* The pattern matched so generate the appropriate code. */
fprintf(vlog_out, "%*c", get_indent(), ' ');
wid = emit_stmt_lval(scope, event_assign);
fprintf(vlog_out, " =");
if (repeat) {
fprintf(vlog_out, " repeat (");
emit_expr(scope, ivl_stmt_cond_expr(repeat), 0);
fprintf(vlog_out, ")");
}
fprintf(vlog_out, " @(");
emit_event(scope, event);
fprintf(vlog_out, ") ");
emit_expr(scope, ivl_stmt_rval(assign), wid);
fprintf(vlog_out, ";");
emit_stmt_file_line(stmt);
fprintf(vlog_out, "\n");
return 1;
}
/*
* Icarus translated <var> = <delay or event> <value> into
* begin
* <tmp> = <value>;
* <delay or event> <var> = <tmp>;
* end
* This routine looks for this pattern and turns it back into the
* appropriate blocking assignment.
*/
static unsigned is_delayed_or_event_assign(ivl_scope_t scope,
ivl_statement_t stmt)
{
unsigned wid;
ivl_statement_t assign, delay, delayed_assign;
ivl_statement_type_t delay_type;
ivl_lval_t lval;
ivl_expr_t rval;
ivl_signal_t lsig, rsig;
/* We must have two block elements. */
if (ivl_stmt_block_count(stmt) != 2) return 0;
/* The first must be an assign. */
assign = ivl_stmt_block_stmt(stmt, 0);
if (ivl_statement_type(assign) != IVL_ST_ASSIGN) return 0;
/* The second must be a delayx. */
delay = ivl_stmt_block_stmt(stmt, 1);
delay_type = ivl_statement_type(delay);
if ((delay_type != IVL_ST_DELAYX) &&
(delay_type != IVL_ST_WAIT)) return 0;
/* The statement for the delayx must be an assign. */
delayed_assign = ivl_stmt_sub_stmt(delay);
if (ivl_statement_type(delayed_assign) != IVL_ST_ASSIGN) return 0;
/* The L-value must be a single signal. */
if (ivl_stmt_lvals(assign) != 1) return 0;
lval = ivl_stmt_lval(assign, 0);
/* It must not have an array select. */
if (ivl_lval_idx(lval)) return 0;
/* It must not have a non-zero base. */
if (ivl_lval_part_off(lval)) return 0;
lsig = ivl_lval_sig(lval);
/* It must not be part of the signal. */
if (ivl_lval_width(lval) != ivl_signal_width(lsig)) return 0;
/* The R-value must be a single signal. */
rval = ivl_stmt_rval(delayed_assign);
if (ivl_expr_type(rval) != IVL_EX_SIGNAL) return 0;
/* It must not be an array word. */
if (ivl_expr_oper1(rval)) return 0;
rsig = ivl_expr_signal(rval);
/* The two signals must be the same. */
if (lsig != rsig) return 0;
/* And finally the three statements must have the same line number
* as the block. */
if ((ivl_stmt_lineno(stmt) != ivl_stmt_lineno(assign)) ||
(ivl_stmt_lineno(stmt) != ivl_stmt_lineno(delay)) ||
(ivl_stmt_lineno(stmt) != ivl_stmt_lineno(delayed_assign))) {
return 0;
}
/* The pattern matched so generate the appropriate code. */
fprintf(vlog_out, "%*c", get_indent(), ' ');
wid = emit_stmt_lval(scope, delayed_assign);
fprintf(vlog_out, " = ");
if (delay_type == IVL_ST_DELAYX) {
fprintf(vlog_out, "#(");
emit_scaled_delayx(scope, ivl_stmt_delay_expr(delay), 1);
} else {
fprintf(vlog_out, "@(");
emit_event(scope, delay);
}
fprintf(vlog_out, ") ");
emit_expr(scope, ivl_stmt_rval(assign), wid);
fprintf(vlog_out, ";");
emit_stmt_file_line(stmt);
fprintf(vlog_out, "\n");
return 1;
}
void emit_stmt(ivl_scope_t scope, ivl_statement_t stmt)
{
switch(ivl_statement_type(stmt)) {
case IVL_ST_NOOP:
/* If this is a statement termination then just finish the
* statement, otherwise print an empty begin/end pair. */
if (single_indent) {
single_indent = 0;
fprintf(vlog_out, ";\n");
} else {
fprintf(vlog_out, "%*cbegin\n", get_indent(), ' ');
fprintf(vlog_out, "%*cend\n", get_indent(), ' ');
}
break;
case IVL_ST_ALLOC:
/* This statement is only used with an automatic task so we
* can safely skip it. The automatic task definition will
* generate an appropriate error message.*/
break;
case IVL_ST_ASSIGN:
emit_stmt_assign(scope, stmt);
break;
case IVL_ST_ASSIGN_NB:
emit_stmt_assign_nb(scope, stmt);
break;
case IVL_ST_BLOCK:
if (ivl_stmt_block_scope(stmt)) {
emit_stmt_block_named(scope, stmt);
} else {
if (is_delayed_or_event_assign(scope, stmt)) break;
if (is_for_loop(scope, stmt)) break;
if (is_repeat_event_assign(scope, stmt)) break;
if (is_wait(scope, stmt)) break;
if (is_utask_call_with_args(scope, stmt)) break;
emit_stmt_block(scope, stmt);
}
break;
case IVL_ST_CASE:
case IVL_ST_CASER:
case IVL_ST_CASEX:
case IVL_ST_CASEZ:
emit_stmt_case(scope, stmt);
break;
case IVL_ST_CASSIGN:
emit_stmt_cassign(scope, stmt);
break;
case IVL_ST_CONDIT:
emit_stmt_condit(scope, stmt);
break;
case IVL_ST_DEASSIGN:
emit_stmt_deassign(scope, stmt);
break;
case IVL_ST_DELAY:
emit_stmt_delay(scope, stmt);
break;
case IVL_ST_DELAYX:
emit_stmt_delayx(scope, stmt);
break;
case IVL_ST_DISABLE:
emit_stmt_disable(scope, stmt);
break;
case IVL_ST_FORCE:
emit_stmt_force(scope, stmt);
break;
case IVL_ST_FOREVER:
emit_stmt_forever(scope, stmt);
break;
case IVL_ST_FORK:
if (ivl_stmt_block_scope(stmt)) {
emit_stmt_fork_named(scope, stmt);
} else {
emit_stmt_fork(scope, stmt);
}
break;
case IVL_ST_FREE:
/* This statement is only used with an automatic task so we
* can safely skip it. The automatic task definition will
* generate an appropriate error message.*/
break;
case IVL_ST_RELEASE:
emit_stmt_release(scope, stmt);
break;
case IVL_ST_REPEAT:
emit_stmt_repeat(scope, stmt);
break;
case IVL_ST_STASK:
emit_stmt_stask(scope, stmt);
break;
case IVL_ST_TRIGGER:
emit_stmt_trigger(scope, stmt);
break;
case IVL_ST_UTASK:
emit_stmt_utask(scope, stmt);
break;
case IVL_ST_WAIT:
emit_stmt_wait(scope, stmt);
break;
case IVL_ST_WHILE:
emit_stmt_while(scope, stmt);
break;
default:
fprintf(vlog_out, "%*c<unknown>;\n", get_indent(), ' ');
fprintf(stderr, "%s:%u: vlog95 error: Unknown statement "
"type (%d).\n",
ivl_stmt_file(stmt),
ivl_stmt_lineno(stmt),
(int)ivl_statement_type(stmt));
vlog_errors += 1;
break;
}
}
