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Support decimal constants of arbitrary widths.

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This commit is contained in:
Wilson Snyder
2009-06-12 08:27:48 -04:00
parent ea78520220
commit 3c395c26be
7 changed files with 99 additions and 12 deletions
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src/V3Number.cpp
+25 -12
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@@ -131,31 +131,43 @@ V3Number::V3Number (FileLine* fileline, const char* sourcep) {
// Convert decimal number to hex
int olen = 0;
uint32_t val = 0;
for (const char* cp=value_startp;
*cp; cp++) {
int got_x = 0;
int got_z = 0;
int got_01 = 0;
for (const char* cp=value_startp; *cp; cp++) {
switch (tolower(*cp)) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9': {
val = val*10 + (*cp-'0');
m_value[0] = val;
if (width()>32 && olen>7/*10000000 fits in 32 bits, so ok*/) {
m_fileline->v3error("Unsupported: Conversion of decimal number over 32 bits, use hex\n");
olen=0;
if (olen<=7) { // 10000000 fits in 32 bits, so ok
// Constants are common, so for speed avoid wide math until we need it
val = val*10 + (*cp-'0');
m_value[0] = val;
} else { // Wide; all previous digits are already in m_value[0]
// this = (this * 10)/*product*/ + (*cp-'0')/*addend*/
// Assumed rare; lots of optimizations are possible here
V3Number product (fileline, width()+4); // +4 for overflow detection
V3Number ten (fileline, width()+4, 10);
V3Number addend (fileline, width(), (*cp-'0'));
product.opMul(*this,ten);
this->opAdd(product,addend);
if (product.bitsValue(width(), 4)) { // Overflowed
m_fileline->v3error("Too many digits for "<<width()<<" bit number: "<<sourcep);
while (*(cp+1)) cp++; // Skip ahead so don't get multiple warnings
}
}
olen++;
got_01 = 1;
break;
}
case 'z': case '?': {
if (olen) m_fileline->v3error("Multi-digit X/Z/? not legal in decimal constant: "<<*cp);
if (!m_sized) m_fileline->v3error("Unsized X/Z/? not legal in decimal constant: "<<*cp);
olen++;
setAllBitsZ();
got_z = 1;
break;
}
case 'x': {
if (olen) m_fileline->v3error("Multi-digit X/Z/? not legal in decimal constant: "<<*cp);
if (!m_sized) m_fileline->v3error("Unsized X/Z/? not legal in decimal constant: "<<*cp);
olen++;
got_x = 1;
setAllBitsX();
break;
}
@@ -167,6 +179,7 @@ V3Number::V3Number (FileLine* fileline, const char* sourcep) {
}
}
obit = width();
if ((got_01+got_x+got_z)>1) m_fileline->v3error("Mixing X/Z/? with digits not legal in decimal constant: "<<value_startp);
}
else {
// Convert bin/octal number to hex
@@ -174,7 +187,7 @@ V3Number::V3Number (FileLine* fileline, const char* sourcep) {
(cp>=value_startp
&& obit<=width());
cp--) {
if (*cp!='_' && obit>=width()) {
if (*cp!='_' && *cp!='0' && obit>=width()) {
m_fileline->v3error("Too many digits for "<<width()<<" bit number: "<<sourcep);
break;
}