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Merge pull request #1964 from YosysHQ/claire/sformatf 

Extend support for format strings in Verilog front-end
This commit is contained in:
Claire Wolf 2020-04-20 14:51:40 +02:00 committed by GitHub
parent 2b1fb8c0a0 35990b95ec
commit ae115fa3aa
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 38 additions and 8 deletions
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46
frontends/ast/simplify.cc
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@ -64,6 +64,21 @@ std::string AstNode::process_format_str(const std::string &sformat, int next_arg
continue;
}
bool got_len = false;
bool got_zlen = false;
int len_value = 0;
while ('0' <= cformat && cformat <= '9')
{
if (!got_len && cformat == '0')
got_zlen = true;
got_len = true;
len_value = 10*len_value + (cformat - '0');
cformat = sformat[++i];
}
// Simplify the argument
AstNode *node_arg = nullptr;
@ -74,6 +89,9 @@ std::string AstNode::process_format_str(const std::string &sformat, int next_arg
case 'S':
case 'd':
case 'D':
if (got_len)
goto unsupported_format;
/* fall through */
case 'x':
case 'X':
if (next_arg >= GetSize(children))
@ -88,9 +106,12 @@ std::string AstNode::process_format_str(const std::string &sformat, int next_arg
case 'm':
case 'M':
if (got_len)
goto unsupported_format;
break;
default:
unsupported_format:
log_file_error(filename, location.first_line, "System task `%s' called with invalid/unsupported format specifier.\n", str.c_str());
break;
}
@ -104,19 +125,28 @@ std::string AstNode::process_format_str(const std::string &sformat, int next_arg
case 'd':
case 'D':
{
char tmp[128];
snprintf(tmp, sizeof(tmp), "%d", node_arg->bitsAsConst().as_int());
sout += tmp;
}
sout += stringf("%d", node_arg->bitsAsConst().as_int());
break;
case 'x':
case 'X':
{
char tmp[128];
snprintf(tmp, sizeof(tmp), "%x", node_arg->bitsAsConst().as_int());
sout += tmp;
Const val = node_arg->bitsAsConst();
while (GetSize(val) % 4 != 0)
val.bits.push_back(State::S0);
int len = GetSize(val) / 4;
for (int i = len; i < len_value; i++)
sout += got_zlen ? '0' : ' ';
for (int i = len-1; i >= 0; i--) {
Const digit = val.extract(4*i, 4);
if (digit.is_fully_def())
sout += stringf(cformat == 'x' ? "%x" : "%X", digit.as_int());
else
sout += cformat == 'x' ? "x" : "X";
}
}
break;