Commits on Nov 20, 2020

1. Check exponent value can be expressed in uint64_t …

   Undefined Sanitizer found the following error.
   
   ```
   sudo ./src/bpftrace -e 'BEGIN {@ = 1e30;}'
   /home/ubuntu/work/bpftrace/src/utils.cpp:809:10: runtime error: 1e+30 is outside the range of representable values of type 'unsigned long'
   SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /home/ubuntu/work/bpftrace/src/utils.cpp:809:10 in
   Attaching 1 probe...
   ^C
   
   @: 0
   ```
   
   To fix this, in the parse_exponent(), check the exponent value and if
   it's bigger than uint64_t'x max value, throw exception. The Lexer then
   make an error.
   
   Now it becomes
   
   ```
   % sudo ./src/bpftrace -e 'BEGIN {@ = 1e30;}'
   stdin:1:12-16: ERROR: 1e30 is too big for uint64_t
   BEGIN {@ = 1e30;}
              ~~~~
   stdin:1:12-17: ERROR: syntax error, unexpected ;
   BEGIN {@ = 1e30;}
              ~~~~~
   ```

   

   mmisono committed Nov 20, 2020
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