Hi,
I'm currently doing a research project that involves modifying the V8 code
to gather some information about the JS execution (e.g., stack traces, JIT
code address info, DOM element modifications, etc.). FYI, I'm running
Chrome on my Surface 3, which is running Windows 10 Home (64-bit). I'm
using Microsoft Visual Studio 12.0 to build (and debug) Chrome.
Right now, I'm simply trying to see how I can output the stack trace to a
file right before an error message is shown. To do so, I modified the
Isolate::ReportPendingMessages() function in isolate.cc to include the
following code:
void Isolate::ReportPendingMessages() {
...
if (!message_obj->IsTheHole() && should_report_exception) {
/*NEW CODE STARTS HERE*/
//First, get the stack trace string
Handle<String> st = StackTraceString();
//Next, set up the output file using fopen
FILE * pFile;
pFile = fopen("C:\\sample_outputs\\jsbt_outputs_stack.txt", "w");
if (pFile != NULL) {
st->PrintOn(pFile);
}
else {
int a = errno;
...
}
/*NEW CODE ENDS HERE*/
...
}
}
The problem is, when I run this code, fopen() always returns NULL, with an
errno of 13 (which means "Permission denied"). I've tried various
combinations of several things, including running my Chrome exe in admin
mode and changing the permissions for the output folder, but the same thing
happens (i.e., errno set to 13).
Your help is much appreciated. Thanks in advance!
Frolin
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