Updates:
Status: Fixed
Owner: [email protected]
Comment #1 on issue 2005 by [email protected]: Ability to track and
display the number times each line of code executed
http://code.google.com/p/v8/issues/detail?id=2005
The existing debugger API can be easily extended to perform such a task. I
wrote and attached a simple javascript wrapper that accomplishes this.
However, this is far slower than instrumenting the javascript code since
the instrumentation code is compiled as well, whereas using the debugger
interrupts the execution at every single step.
Start the script using
$ ./d8 --expose-debug-as debug lineprofile.js -e "profile('test.js')"
The output should be
line 1 [ 0 ]: function f(n) {
line 2 [ 15 ]: if (n < 2) return 1;
line 3 [ 14 ]: return f(n-1) + f(n-2);
line 4 [ 8 ]: }
line 5 [ 1 ]: f(5);
Note that line 3 is counted twice when being executed, once when f(n-1) is
evaluated and once when f(n-2) is evaluated.
Feel free to extend this script.
Attachments:
lineprofile.js 3.0 KB
test.js 73 bytes
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