Which flags does --trace incorporate? Or in otherwords, where is the
printfs coming from: I don't see trace as an option on the d8 help list,
but it does work:
I see the function name "test" being printed out: (e.g.)
1: ~+51(this=0x24e1a20144b9 <JS Global Object>) {
and the output of the function and its type as well: <String[2]: aa>
My goal in with this is to determine the number of times a function for a
given set of arguments is called, and so if I can see where these traces
are being printed, I can maintain my own data structure in the same
location.
program:
function test( obj ) {
return obj.prop + obj.prop;
}
var a = { prop: 'a' }, i = 0;
while ( i++ < 10000 ) {
test( a );
}
output:
1: ~+27(this=0x24e1a2005009 <JS Global Object>) {
2: ~ExtendStringPrototype+23(this=0x3d090ae04121 <undefined>) {
2: } -> 0x3d090ae04121 <undefined>
1: } -> 0x3d090ae04121 <undefined>
1: ~+27(this=0x24e1a2005009 <JS Global Object>) {
2: ~ExtendStringForTemplates+23(this=0x3d090ae04121 <undefined>) {
2: } -> 0x3d090ae04121 <undefined>
1: } -> 0x3d090ae04121 <undefined>
1: ~+27(this=0x24e1a20144b9 <JS Global Object>) {
2: ~ExtendStringPrototype+23(this=0x3d090ae04121 <undefined>) {
2: } -> 0x3d090ae04121 <undefined>
1: } -> 0x3d090ae04121 <undefined>
1: ~+27(this=0x24e1a20144b9 <JS Global Object>) {
2: ~ExtendStringForTemplates+23(this=0x3d090ae04121 <undefined>) {
2: } -> 0x3d090ae04121 <undefined>
1: } -> 0x3d090ae04121 <undefined>
1: ~+51(this=0x24e1a20144b9 <JS Global Object>) {
2: ~test+47(this=0x24e1a20144b9 <JS Global Object>, 0x24e1a2022469 <an
Object with map 0x3c6abe514231>) {
2: } -> 0x24e1a20225b1 <String[2]: aa>
2: ~test+47(this=0x24e1a20144b9 <JS Global Object>, 0x24e1a2022469 <an
Object with map 0x3c6abe
On Wednesday, March 4, 2015 at 2:47:37 PM UTC-5, Jakob Kummerow wrote:
>
> Try --trace.
>
> On Wed, Mar 4, 2015 at 8:12 PM, Malek Musleh <[email protected]
> <javascript:>> wrote:
>
>> Hi,
>>
>>
>> I want to be able trace / record a programs call to its functions (name +
>> argument values) either as a separate analysis pass or in addition to an
>> existing one (which ever is easier). I see that there is an an api for
>> printing/formatting the stack trace: prepareStackTrace in src/messages.js
>> but that is only called on internal errors.
>>
>> I think I shold be trying to call prepareStackTrace in order to get the
>> information I want, I am just not sure in which passes/source file would be
>> the best place to do so.
>>
>>
>> Thanks,
>>
>> Malek
>>
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