mirrors/yosys
3
0
Fork 0
mirror of https://github.com/YosysHQ/yosys synced 2025-07-24 05:08:56 +00:00
Code Activity

ast: translate $display/$write tasks in always blocks to new $print cell.

Browse source
This commit is contained in:
whitequark 2020-11-29 14:34:17 +00:00 • committed by Marcelina Kościelnicka
parent 9f8e039a4b
commit d5c9953c09
5 changed files with 115 additions and 19 deletions
Download patch file Download diff file Expand all files Collapse all files

40
frontends/ast/simplify.cc
View file

@ -951,29 +951,33 @@ bool AstNode::simplify(bool const_fold, bool in_lvalue, int stage, int width_hin
str = std::string();
}
if ((type == AST_TCALL) && (str.substr(0, 8) == "$display" || str.substr(0, 6) == "$write") && (!current_always || current_always->type != AST_INITIAL)) {
log_file_warning(filename, location.first_line, "System task `%s' outside initial block is unsupported.\n", str.c_str());
delete_children();
str = std::string();
}
// print messages if this a call to $display() or $write() family of functions
if ((type == AST_TCALL) &&
(str == "$display" || str == "$displayb" || str == "$displayh" || str == "$displayo" ||
str == "$write" || str == "$writeb" || str == "$writeh" || str == "$writeo"))
{
int default_base = 10;
if (str.back() == 'b')
default_base = 2;
else if (str.back() == 'o')
default_base = 8;
else if (str.back() == 'h')
default_base = 16;
if (!current_always) {
log_file_warning(filename, location.first_line, "System task `%s' outside initial or always block is unsupported.\n", str.c_str());
} else if (current_always->type == AST_INITIAL) {
int default_base = 10;
if (str.back() == 'b')
default_base = 2;
else if (str.back() == 'o')
default_base = 8;
else if (str.back() == 'h')
default_base = 16;
Fmt fmt = processFormat(stage, /*sformat_like=*/false, default_base);
if (str.substr(0, 8) == "$display")
fmt.append_string("\n");
log("%s", fmt.render().c_str());
// when $display()/$write() functions are used in an initial block, print them during synthesis
Fmt fmt = processFormat(stage, /*sformat_like=*/false, default_base);
if (str.substr(0, 8) == "$display")
fmt.append_string("\n");
log("%s", fmt.render().c_str());
} else {
// when $display()/$write() functions are used in an always block, simplify the expressions and
// convert them to a special cell later in genrtlil
for (auto node : children)
while (node->simplify(true, false, stage, -1, false, false)) {}
return false;
}
delete_children();
str = std::string();