Thanks for your quick answer, Andreas!
So, I got the snippet I showed you avove by mail to look over the ASM code
(I dont have much experience with Javascript ;) ).
When run the d8 as follows:
v8/out/ia32.release/d8 --print_opt_code test.js
With the code printed in the RAW section (slightly modified, like):
function foo(n)
{
return Math.floor(Math.random() * n);
}
V8 prints just nothing...
Am I missing something?
Am Dienstag, 22. September 2015 08:34:46 UTC+2 schrieb Andreas Rossberg:
>
> The printed raw source _is_ the exact source of that individual function
> (minus the 'function' prefix). What are you missing?
>
> On 21 September 2015 at 23:49, D T <[email protected] <javascript:>>
> wrote:
>
>> Hi v8 users,
>>
>> I am using d8 version 4.7.0 on Ubuntu Linux vivid. I played around with
>> d8 a little bit and used the following command line:
>> user@debugbox: v8/out/ia32.release/d8 --print_opt_code test.js
>>
>>
>>
>>
>> Which leads to the following output:
>> --- Raw source ---
>> (n)
>> {
>> return Math.floor(Math.random() * n);
>> }
>>
>>
>>
>>
>> --- Optimized code ---
>> optimization_id = 0
>> source_position = 27528
>> kind = OPTIMIZED_FUNCTION
>> name = rnd
>> stack_slots = 2
>> compiler = crankshaft
>> Instructions (size = 612)
>> 0x2020e060 0 55 push ebp
>> 0x2020e061 1 89e5 mov ebp,esp
>> 0x2020e063 3 56 push esi
>> 0x2020e064 4 57 push edi
>> 0x2020e065 5 83ec08 sub esp,0x8
>> 0x2020e068 8 50 push eax
>> 0x2020e069 9 c7c002000000 mov eax,0x2
>> 0x2020e06f 15 c70484efdeefbe mov [esp+eax*4],0xbeefdeef
>> 0x2020e076 22 48 dec eax
>> 0x2020e077 23 75f6 jnz 15 (0x2020e06f)
>> 0x2020e079 25 58 pop eax
>> 0x2020e07a 26 c745f400000000 mov [ebp-0xc],0x0
>> 0x2020e081 33 8b45fc mov eax,[ebp-0x4]
>> 0x2020e084 36 8945f0 mov [ebp-0x10],eax
>> 0x2020e087 39 89c6 mov esi,eax
>> 0x2020e089 41 3b25241aa009 cmp esp,[0x9a01a24] ;; external
>> reference (StackGuard::address_of_jslimit())
>> 0x2020e08f 47 7305 jnc 54 (0x2020e096)
>> 0x2020e091 49 e8ea15321b call StackCheck (0x3b52f680) ;; code
>> : BUILTIN
>> 0x2020e096 54 b805cfb729 mov eax,0x29b7cf05
>> [snip]
>>
>>
>>
>> Is there any way, to print the _original_ javascript code I feeded into
>> v8 (since the raw source here is not the exact same code as the input
>> code), before printing the optimized, corresponding code?
>>
>> Thanks!
>>
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>
>
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