Block* find_block_that_exit_point_will_reach(Term* term)
{
ca_assert(is_exit_point(term));
Block* block = term->owningBlock;
// 'return' exits to nearest major block.
if (term->function == FUNCS.return_func) {
while (is_minor_block(block)) {
Block* parent = get_parent_block(block);
if (parent == NULL)
return block;
block = parent;
}
return block;
}
// 'case_condition_bool' exits the current if-block.
if (term->function == FUNCS.case_condition_bool)
return get_parent_block(term->owningBlock);
// Otherwise, exit to nearest for-loop.
while (!is_for_loop(block) && !is_while_loop(block)) {
Block* parent = get_parent_block(block);
if (parent == NULL)
return block;
block = parent;
}
return block;
}
Block* find_enclosing_loop(Block* block)
{
while (true) {
if (block == NULL)
return NULL;
if (is_while_loop(block) || is_for_loop(block))
return block;
if (is_major_block(block))
return NULL;
block = get_parent_block(block);
}
return NULL;
}
void start_for_loop(caStack* stack, bool enableLoopOutput)
{
Frame* frame = top_frame(stack);
Branch* contents = frame->branch;
// Check if top frame actually contains a for-loop (it might be using the #zero branch)
if (!is_for_loop(contents))
return;
// Initialize the loop index
set_int(get_frame_register(frame, for_loop_find_index(contents)), 0);
if (enableLoopOutput) {
// Initialize output value
set_int(get_frame_register(frame, for_loop_find_output_index(contents)), 0);
caValue* listInput = circa_input(stack, 0);
set_list(get_frame_register_from_end(frame, 0), list_length(listInput));
}
// Interpreter will run the contents of the branch
}
bool is_loop(Block* block)
{
return is_for_loop(block) || is_while_loop(block);
}
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;
}
}