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Warn on literals exceeding the specified bit width

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This commit is contained in:
Florian Zeitz 2015-08-17 15:27:35 +02:00
parent b7cb5e281f
commit 64ccbf8510
1 changed files with 39 additions and 34 deletions
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73
frontends/verilog/const2ast.cc
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@ -96,44 +96,51 @@ static void my_strtobin(std::vector<RTLIL::State> &data, const char *str, int le
if (base == 10 && GetSize(digits) == 1 && digits.front() >= 0xf0)
base = 2;
data.clear();
if (base == 10) {
data.clear();
if (len_in_bits < 0) {
while (!digits.empty())
data.push_back(my_decimal_div_by_two(digits) ? RTLIL::S1 : RTLIL::S0);
while (data.size() < 32)
data.push_back(RTLIL::S0);
} else {
for (int i = 0; i < len_in_bits; i++)
data.push_back(my_decimal_div_by_two(digits) ? RTLIL::S1 : RTLIL::S0);
while (!digits.empty())
data.push_back(my_decimal_div_by_two(digits) ? RTLIL::S1 : RTLIL::S0);
} else {
int bits_per_digit = my_ilog2(base-1);
for (auto it = digits.rbegin(), e = digits.rend(); it != e; it++) {
for (int i = 0; i < bits_per_digit; i++) {
int bitmask = 1 << i;
if (*it == 0xf0)
data.push_back(case_type == 'x' ? RTLIL::Sa : RTLIL::Sx);
else if (*it == 0xf1)
data.push_back(case_type == 'x' || case_type == 'z' ? RTLIL::Sa : RTLIL::Sz);
else if (*it == 0xf2)
data.push_back(RTLIL::Sa);
else
data.push_back((*it & bitmask) ? RTLIL::S1 : RTLIL::S0);
}
}
}
int len = GetSize(data);
RTLIL::State msb = data.back();
if (len_in_bits < 0) {
if (len < 32)
data.resize(32, msb == RTLIL::S0 || msb == RTLIL::S1 ? RTLIL::S0 : msb);
return;
}
int bits_per_digit = my_ilog2(base-1);
if (len_in_bits < 0)
len_in_bits = std::max<int>(digits.size() * bits_per_digit, 32);
data.clear();
data.resize(len_in_bits);
for (int i = 0; i < len_in_bits; i++) {
int bitmask = 1 << (i % bits_per_digit);
int digitidx = digits.size() - (i / bits_per_digit) - 1;
if (digitidx < 0) {
if (i > 0 && (data[i-1] == RTLIL::Sz || data[i-1] == RTLIL::Sx || data[i-1] == RTLIL::Sa))
data[i] = data[i-1];
else
data[i] = RTLIL::S0;
} else if (digits[digitidx] == 0xf0)
data[i] = case_type == 'x' ? RTLIL::Sa : RTLIL::Sx;
else if (digits[digitidx] == 0xf1)
data[i] = case_type == 'x' || case_type == 'z' ? RTLIL::Sa : RTLIL::Sz;
else if (digits[digitidx] == 0xf2)
data[i] = RTLIL::Sa;
else
data[i] = (digits[digitidx] & bitmask) ? RTLIL::S1 : RTLIL::S0;
for (len = len - 1; len >= 0; len--)
if (data[len] == RTLIL::S1)
break;
if (msb == RTLIL::S0 || msb == RTLIL::S1) {
len += 1;
data.resize(len_in_bits, RTLIL::S0);
} else {
len += 2;
data.resize(len_in_bits, msb);
}
if (len > len_in_bits)
log_warning("(Literal has a width of %d bit, but value requires %d bit. (%s:%d)\n",
len_in_bits, len, current_filename.c_str(), get_line_num());
}
// convert the Verilog code for a constant to an AST node
@ -220,8 +227,6 @@ AstNode *VERILOG_FRONTEND::const2ast(std::string code, char case_type, bool warn
if (len_in_bits < 0) {
if (is_signed && data.back() == RTLIL::S1)
data.push_back(RTLIL::S0);
while (data.size() < 32)
data.push_back(RTLIL::S0);
}
return AstNode::mkconst_bits(data, is_signed);
}