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segmentation fault in Preproc.so #527

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veripoolbot opened this issue Jun 28, 2012 · 2 comments
Closed

segmentation fault in Preproc.so #527

veripoolbot opened this issue Jun 28, 2012 · 2 comments
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Author Name: sorin lazarescu
Original Redmine Issue: 527 from https://www.veripool.org
Original Date: 2012-06-28
Original Assignee: Wilson Snyder (@wsnyder)

I am using Perl 5 version 16. This was compiled, installed and ran on a machine running RedHat 5.6 64 bit.

I have Verilog::Perl 3.315 installed.

The line $self->_open($filename); from the subroutine open in the file Preproc.pm causes a segmentation fault. I am attaching a valgrind trace that shows where the segmentation fault occurred. What could be causing this?

I would like to add that everything works fine if I use Perl 5.8.8 and Verilog::Perl 3.221.
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Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2012-07-15T15:22:59Z

Sorry for the delay. Is the version of "flex" the same in both cases?

Based on the valgrind report, try this:

diff --git a/Preproc/VPreLex.l b/Preproc/VPreLex.l
--- a/Preproc/VPreLex.l
+++ b/Preproc/VPreLex.l
@@ -505,7 +505,8 @@ void VPreLex::scanBytesBack(const string& str) {

string VPreLex::currentUnreadChars() {
// WARNING - Peeking at internals

  • if (!currentBuffer()) return "";
    ssize_t left = (yy_n_chars - (yy_c_buf_p - currentBuffer()->yy_ch_buf));
    if (left > 0) { // left may be -1 at EOS
    *(yy_c_buf_p) = (yy_hold_char);
    return string(yy_c_buf_p, left);

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Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2013-05-30T00:36:43Z

Closing due to age / no response.

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