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Fix trace overflow on huge arrays, bug834.

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This commit is contained in:
Wilson Snyder
2014-11-05 22:22:27 -05:00
parent 7ef84df852
commit 3234fa15ef
5 changed files with 78 additions and 9 deletions
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include/verilated_vcd_c.cpp
+19 -2
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@@ -261,6 +261,20 @@ void VerilatedVcd::printTime (vluint64_t timeui) {
printQuad(timeui);
}
void VerilatedVcd::bufferResize(vluint64_t minsize) {
// minsize is size of largest write. We buffer at least 8 times as much data,
// writing when we are 3/4 full (with thus 2*minsize remaining free)
if (VL_UNLIKELY(minsize > m_wrChunkSize)) {
char* oldbufp = m_wrBufp;
m_wrChunkSize = minsize*2;
m_wrBufp = new char [m_wrChunkSize * 8];
memcpy(m_wrBufp, oldbufp, m_writep - oldbufp);
m_writep = m_wrBufp + (m_writep - oldbufp);
m_wrFlushp = m_wrBufp + m_wrChunkSize * 6;
delete oldbufp; oldbufp=NULL;
}
}
void VerilatedVcd::bufferFlush () {
// We add output data to m_writep.
// When it gets nearly full we dump it using this routine which calls write()
@@ -444,6 +458,9 @@ void VerilatedVcd::declare (vluint32_t code, const char* name, const char* wirep
m_sigs.reserve(m_nextCode*2); // Power-of-2 allocation speeds things up
}
// Make sure write buffer is large enough (one character per bit), plus header
bufferResize(bits+1024);
// Save declaration info
VerilatedVcdSig sig = VerilatedVcdSig(code, bits);
m_sigs.push_back(sig);
@@ -522,7 +539,7 @@ void VerilatedVcd::declDouble (vluint32_t code, const char* name, int arraynum
void VerilatedVcd::fullDouble (vluint32_t code, const double newval) {
(*((double*)&m_sigs_oldvalp[code])) = newval;
// Buffer can't overflow; we have at least bufferInsertSize() bytes (>>>16 bytes)
// Buffer can't overflow before sprintf; we sized during declaration
sprintf(m_writep, "r%.16g", newval);
m_writep += strlen(m_writep);
*m_writep++=' '; printCode(code); *m_writep++='\n';
@@ -530,7 +547,7 @@ void VerilatedVcd::fullDouble (vluint32_t code, const double newval) {
}
void VerilatedVcd::fullFloat (vluint32_t code, const float newval) {
(*((float*)&m_sigs_oldvalp[code])) = newval;
// Buffer can't overflow; we have at least bufferInsertSize() bytes (>>>16 bytes)
// Buffer can't overflow before sprintf; we sized during declaration
sprintf(m_writep, "r%.16g", (double)newval);
m_writep += strlen(m_writep);
*m_writep++=' '; printCode(code); *m_writep++='\n';