I am trying to use --preload-file. The build concludes successfully but
the app is failing to load the files. There are no messages in the
browser or web consoles, except "preload time: XXXms" which seems to
indicate successful preloading.
I attempted to debug the js but found major flaws in all the available
debuggers which I'll list below. I did manage to observe the parameter
being passed to fopen. It was a decimal number. How can I find out if
that corresponds to the intended filename string?
Another issue is lack of documentation about how --preload-file handles
paths. I eventually looked at tests/hello_world_files.cpp which shows
passing a relative path to --preload-file and passing the same relative
path to fopen. That is what I am doing.
I tried to view FS.readFiles but the debugger said it is undefined.
Debugger issues:
* Firefox/built-in debugger showed original C source code and let me
set breakpoints but
o it didn't always stop at the breakpoints.
o when it did and I stepped through the code it jumped wildly
around the code.
o when I finally got it to stop at the first line of a function,
it told me the function's parameter was "undefined" which is
unlikely given that the code at the call site sets it to a
hardcoded number.
* Firefox/Firebug's code search and source browser is completely
useless so I was unable to find the places I want to set
breakpoints. I think the problem is related to the length of the
source file. After I enter the text for which I want to search, the
source browser pane goes blank. If I click an up or down arrow
source code appears but it does not contain the text I was looking
for. It may be that the desired text is nearby but scrolling is
unusable. Each arrow click moves the code too far, so I can't
conform that.
* Chrome. When I set a breakpoint in the Javascript code, the
breakpoints menu shows what appears to be the correct C source code
line but completely different Javascript from the line where I set
the breakpoint. After turning off JS maps, I got the breakpoint in
the right place which is at the caller of the function for loading a
file. However when I attempt to step into the function Chrome acts
as if I had clicked the continue button.
How are you supposed to debug this stuff? Skid marks?
Regards
-Mark
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